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varun-r-mallya:main varun-r-mallya:chore01 varun-r-mallya:noise-arch-change varun-r-mallya:chore-02 varun-r-mallya:dependency-chore varun-r-mallya:varun-r-mallya/protobuf-update varun-r-mallya:async-validators varun-r-mallya:concurrency-issue varun-r-mallya:examples/echo-demo varun-r-mallya:varun-r-mallya/interop/python-rust varun-r-mallya:py-rust-interop-build-fix varun-r-mallya:interop/py-rust varun-r-mallya:test/utils/interop/base-interactive/time-complexity-improvement varun-r-mallya:interop/rust-py varun-r-mallya:master
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compare: varun-r-mallya:examples/echo-demo
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varun-r-mallya:chore01 varun-r-mallya:noise-arch-change varun-r-mallya:chore-02 varun-r-mallya:dependency-chore varun-r-mallya:main varun-r-mallya:varun-r-mallya/protobuf-update varun-r-mallya:async-validators varun-r-mallya:concurrency-issue varun-r-mallya:examples/echo-demo varun-r-mallya:varun-r-mallya/interop/python-rust varun-r-mallya:py-rust-interop-build-fix varun-r-mallya:interop/py-rust varun-r-mallya:test/utils/interop/base-interactive/time-complexity-improvement varun-r-mallya:interop/rust-py varun-r-mallya:master

1 Commits
chore-02 ... examples/e

Author SHA1 Message Date
varun-r-mallya
523cc1810a fix(examples/echo/echo.py): Add max message length to stream.read 
Signed-off-by: varun-r-mallya <varunrmallya@gmail.com>
 2025-06-10 03:34:52 +05:30
260 changed files with 1296 additions and 29304 deletions
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3
.gitignore vendored
View File

@ -178,6 +178,3 @@ env.bak/
#lockfiles
uv.lock
poetry.lock
# Sphinx documentation build
_build/

18
Makefile
View File

@ -14,7 +14,6 @@ help:
@echo "package-test - build package and install it in a venv for manual testing"
@echo "notes - consume towncrier newsfragments and update release notes in docs - requires bump to be set"
@echo "release - package and upload a release (does not run notes target) - requires bump to be set"
@echo "pr - run clean, fix, lint, typecheck, and test i.e basically everything you need to do before creating a PR"
clean-build:
rm -fr build/
@ -48,8 +47,6 @@ typecheck:
test:
python -m pytest tests -n auto
pr: clean fix lint typecheck test
# protobufs management
PB = libp2p/crypto/pb/crypto.proto \
@ -58,19 +55,13 @@ PB = libp2p/crypto/pb/crypto.proto \
libp2p/security/secio/pb/spipe.proto \
libp2p/security/noise/pb/noise.proto \
libp2p/identity/identify/pb/identify.proto \
libp2p/host/autonat/pb/autonat.proto \
libp2p/relay/circuit_v2/pb/circuit.proto \
libp2p/relay/circuit_v2/pb/dcutr.proto \
libp2p/kad_dht/pb/kademlia.proto
libp2p/host/autonat/pb/autonat.proto
PY = $(PB:.proto=_pb2.py)
PYI = $(PB:.proto=_pb2.pyi)
## Set default to `protobufs`, otherwise `format` is called when typing only `make`
all: protobufs
.PHONY: protobufs clean-proto
protobufs: $(PY)
%_pb2.py: %.proto
@ -79,11 +70,6 @@ protobufs: $(PY)
clean-proto:
rm -f $(PY) $(PYI)
# Force protobuf regeneration by making them always out of date
$(PY): FORCE
FORCE:
# docs commands
docs: check-docs
@ -101,7 +87,7 @@ validate-newsfragments:
check-docs: build-docs validate-newsfragments
build-docs:
sphinx-apidoc -o docs/ . "*conftest*" tests/
sphinx-apidoc -o docs/ . setup.py "*conftest*" tests/
$(MAKE) -C docs clean
$(MAKE) -C docs html
$(MAKE) -C docs doctest

52
README.md
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@ -12,13 +12,13 @@
[![Build Status](https://img.shields.io/github/actions/workflow/status/libp2p/py-libp2p/tox.yml?branch=main&label=build%20status)](https://github.com/libp2p/py-libp2p/actions/workflows/tox.yml)
[![Docs build](https://readthedocs.org/projects/py-libp2p/badge/?version=latest)](http://py-libp2p.readthedocs.io/en/latest/?badge=latest)
> py-libp2p has moved beyond its experimental roots and is steadily progressing toward production readiness. The core features are stable, and we’re focused on refining performance, expanding protocol support, and ensuring smooth interop with other libp2p implementations. We welcome contributions and real-world usage feedback to help us reach full production maturity.
> ⚠️ **Warning:** py-libp2p is an experimental and work-in-progress repo under development. We do not yet recommend using py-libp2p in production environments.
Read more in the [documentation on ReadTheDocs](https://py-libp2p.readthedocs.io/). [View the release notes](https://py-libp2p.readthedocs.io/en/latest/release_notes.html).
## Maintainers
Currently maintained by [@pacrob](https://github.com/pacrob), [@seetadev](https://github.com/seetadev) and [@dhuseby](https://github.com/dhuseby). Please reach out to us for collaboration or active feedback. If you have questions, feel free to open a new [discussion](https://github.com/libp2p/py-libp2p/discussions). We are also available on the libp2p Discord — join us at #py-libp2p [sub-channel](https://discord.gg/d92MEugb).
Currently maintained by [@pacrob](https://github.com/pacrob), [@seetadev](https://github.com/seetadev) and [@dhuseby](https://github.com/dhuseby), looking for assistance!
## Feature Breakdown
@ -34,19 +34,19 @@ ______________________________________________________________________
| -------------------------------------- | :--------: | :---------------------------------------------------------------------------------: |
| **`libp2p-tcp`** | ✅ | [source](https://github.com/libp2p/py-libp2p/blob/main/libp2p/transport/tcp/tcp.py) |
| **`libp2p-quic`** | 🌱 | |
| **`libp2p-websocket`** | 🌱 | |
| **`libp2p-webrtc-browser-to-server`** | 🌱 | |
| **`libp2p-webrtc-private-to-private`** | 🌱 | |
| **`libp2p-websocket`** | ❌ | |
| **`libp2p-webrtc-browser-to-server`** | ❌ | |
| **`libp2p-webrtc-private-to-private`** | ❌ | |
______________________________________________________________________
### NAT Traversal
| **NAT Traversal** | **Status** | **Source** |
| ----------------------------- | :--------: | :-----------------------------------------------------------------------------: |
| **`libp2p-circuit-relay-v2`** | ✅ | [source](https://github.com/libp2p/py-libp2p/tree/main/libp2p/relay/circuit_v2) |
| **`libp2p-autonat`** | ✅ | [source](https://github.com/libp2p/py-libp2p/tree/main/libp2p/host/autonat) |
| **`libp2p-hole-punching`** | ✅ | [source](https://github.com/libp2p/py-libp2p/tree/main/libp2p/relay/circuit_v2) |
| **NAT Traversal** | **Status** |
| ----------------------------- | :--------: |
| **`libp2p-circuit-relay-v2`** | ❌ |
| **`libp2p-autonat`** | ❌ |
| **`libp2p-hole-punching`** | ❌ |
______________________________________________________________________
@ -54,27 +54,27 @@ ______________________________________________________________________
| **Secure Communication** | **Status** | **Source** |
| ------------------------ | :--------: | :---------------------------------------------------------------------------: |
| **`libp2p-noise`** | ✅ | [source](https://github.com/libp2p/py-libp2p/tree/main/libp2p/security/noise) |
| **`libp2p-tls`** | 🌱 | |
| **`libp2p-noise`** | 🌱 | [source](https://github.com/libp2p/py-libp2p/tree/main/libp2p/security/noise) |
| **`libp2p-tls`** | ❌ | |
______________________________________________________________________
### Discovery
| **Discovery** | **Status** | **Source** |
| -------------------- | :--------: | :--------------------------------------------------------------------------------: |
| **`bootstrap`** | ✅ | [source](https://github.com/libp2p/py-libp2p/tree/main/libp2p/discovery/bootstrap) |
| **`random-walk`** | 🌱 | |
| **`mdns-discovery`** | ✅ | [source](https://github.com/libp2p/py-libp2p/tree/main/libp2p/discovery/mdns) |
| **`rendezvous`** | 🌱 | |
| **Discovery** | **Status** |
| -------------------- | :--------: |
| **`bootstrap`** | ❌ |
| **`random-walk`** | ❌ |
| **`mdns-discovery`** | ❌ |
| **`rendezvous`** | ❌ |
______________________________________________________________________
### Peer Routing
| **Peer Routing** | **Status** | **Source** |
| -------------------- | :--------: | :--------------------------------------------------------------------: |
| **`libp2p-kad-dht`** | ✅ | [source](https://github.com/libp2p/py-libp2p/tree/main/libp2p/kad_dht) |
| **Peer Routing** | **Status** |
| -------------------- | :--------: |
| **`libp2p-kad-dht`** | ❌ |
______________________________________________________________________
@ -89,10 +89,10 @@ ______________________________________________________________________
### Stream Muxers
| **Stream Muxers** | **Status** | **Source** |
| ------------------ | :--------: | :-------------------------------------------------------------------------------: |
| **`libp2p-yamux`** | ✅ | [source](https://github.com/libp2p/py-libp2p/tree/main/libp2p/stream_muxer/yamux) |
| **`libp2p-mplex`** | ✅ | [source](https://github.com/libp2p/py-libp2p/tree/main/libp2p/stream_muxer/mplex) |
| **Stream Muxers** | **Status** | **Status** |
| ------------------ | :--------: | :----------------------------------------------------------------------------------------: |
| **`libp2p-yamux`** | 🌱 | |
| **`libp2p-mplex`** | 🛠️ | [source](https://github.com/libp2p/py-libp2p/blob/main/libp2p/stream_muxer/mplex/mplex.py) |
______________________________________________________________________
@ -100,7 +100,7 @@ ______________________________________________________________________
| **Storage** | **Status** |
| ------------------- | :--------: |
| **`libp2p-record`** | 🌱 |
| **`libp2p-record`** | ❌ |
______________________________________________________________________

499
docs/examples.circuit_relay.rst
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@ -1,499 +0,0 @@
Circuit Relay v2 Example
========================
This example demonstrates how to use Circuit Relay v2 in py-libp2p. It includes three components:
1. A relay node that provides relay services
2. A destination node that accepts relayed connections
3. A source node that connects to the destination through the relay
Prerequisites
-------------
First, ensure you have py-libp2p installed:
.. code-block:: console
$ python -m pip install libp2p
Collecting libp2p
...
Successfully installed libp2p-x.x.x
Relay Node
----------
Create a file named ``relay_node.py`` with the following content:
.. code-block:: python
import trio
import logging
import multiaddr
import traceback
from libp2p import new_host
from libp2p.relay.circuit_v2.protocol import CircuitV2Protocol
from libp2p.relay.circuit_v2.transport import CircuitV2Transport
from libp2p.relay.circuit_v2.config import RelayConfig
from libp2p.tools.async_service import background_trio_service
logging.basicConfig(level=logging.DEBUG)
logger = logging.getLogger("relay_node")
async def run_relay():
listen_addr = multiaddr.Multiaddr("/ip4/0.0.0.0/tcp/9000")
host = new_host()
config = RelayConfig(
enable_hop=True, # Act as a relay
enable_stop=True, # Accept relayed connections
enable_client=False, # Don't use other relays
max_circuit_duration=3600, # 1 hour
max_circuit_bytes=1024 * 1024 * 10, # 10MB
)
# Initialize the relay protocol with allow_hop=True to act as a relay
protocol = CircuitV2Protocol(host, limits=config.limits, allow_hop=True)
print(f"Created relay protocol with hop enabled: {protocol.allow_hop}")
# Start the protocol service
async with host.run(listen_addrs=[listen_addr]):
peer_id = host.get_id()
print("\n" + "="*50)
print(f"Relay node started with ID: {peer_id}")
print(f"Relay node multiaddr: /ip4/127.0.0.1/tcp/9000/p2p/{peer_id}")
print("="*50 + "\n")
print(f"Listening on: {host.get_addrs()}")
try:
async with background_trio_service(protocol):
print("Protocol service started")
transport = CircuitV2Transport(host, protocol, config)
print("Relay service started successfully")
print(f"Relay limits: {protocol.limits}")
while True:
await trio.sleep(10)
print("Relay node still running...")
print(f"Active connections: {len(host.get_network().connections)}")
except Exception as e:
print(f"Error in relay service: {e}")
traceback.print_exc()
if __name__ == "__main__":
try:
trio.run(run_relay)
except Exception as e:
print(f"Error running relay: {e}")
traceback.print_exc()
Destination Node
----------------
Create a file named ``destination_node.py`` with the following content:
.. code-block:: python
import trio
import logging
import multiaddr
import traceback
import sys
from libp2p import new_host
from libp2p.relay.circuit_v2.protocol import CircuitV2Protocol
from libp2p.relay.circuit_v2.transport import CircuitV2Transport
from libp2p.relay.circuit_v2.config import RelayConfig
from libp2p.peer.peerinfo import info_from_p2p_addr
from libp2p.tools.async_service import background_trio_service
logging.basicConfig(level=logging.DEBUG)
logger = logging.getLogger("destination_node")
async def handle_echo_stream(stream):
"""Handle incoming stream by echoing received data."""
try:
print(f"New echo stream from: {stream.get_protocol()}")
while True:
data = await stream.read(1024)
if not data:
print("Stream closed by remote")
break
message = data.decode('utf-8')
print(f"Received: {message}")
response = f"Echo: {message}".encode('utf-8')
await stream.write(response)
print(f"Sent response: Echo: {message}")
except Exception as e:
print(f"Error handling stream: {e}")
traceback.print_exc()
finally:
await stream.close()
print("Stream closed")
async def run_destination(relay_peer_id=None):
"""
Run a simple destination node that accepts connections.
This is a simplified version that doesn't use the relay functionality.
"""
listen_addr = multiaddr.Multiaddr(f"/ip4/0.0.0.0/tcp/9001")
host = new_host()
# Configure as a relay receiver (stop)
config = RelayConfig(
enable_stop=True, # Accept relayed connections
enable_client=True, # Use relays for outbound connections
max_circuit_duration=3600, # 1 hour
max_circuit_bytes=1024 * 1024 * 10, # 10MB
)
# Initialize the relay protocol
protocol = CircuitV2Protocol(host, limits=config.limits, allow_hop=False)
async with host.run(listen_addrs=[listen_addr]):
# Print host information
dest_peer_id = host.get_id()
print("\n" + "="*50)
print(f"Destination node started with ID: {dest_peer_id}")
print(f"Use this ID in the source node: {dest_peer_id}")
print("="*50 + "\n")
print(f"Listening on: {host.get_addrs()}")
# Set stream handler for the echo protocol
host.set_stream_handler("/echo/1.0.0", handle_echo_stream)
print("Registered echo protocol handler")
# Start the protocol service in the background
async with background_trio_service(protocol):
print("Protocol service started")
# Create and register the transport
transport = CircuitV2Transport(host, protocol, config)
print("Transport created")
# Create a listener for relayed connections
listener = transport.create_listener(handle_echo_stream)
print("Created relay listener")
# Start listening for relayed connections
async with trio.open_nursery() as nursery:
await listener.listen("/p2p-circuit", nursery)
print("Destination node ready to accept relayed connections")
if not relay_peer_id:
print("No relay peer ID provided. Please enter the relay's peer ID:")
print("Waiting for relay peer ID input...")
while True:
if sys.stdin.isatty(): # Only try to read from stdin if it's a terminal
try:
relay_peer_id = input("Enter relay peer ID: ").strip()
if relay_peer_id:
break
except EOFError:
await trio.sleep(5)
else:
print("No terminal detected. Waiting for relay peer ID as command line argument.")
await trio.sleep(10)
continue
# Connect to the relay node with the provided relay peer ID
relay_addr_str = f"/ip4/127.0.0.1/tcp/9000/p2p/{relay_peer_id}"
print(f"Connecting to relay at {relay_addr_str}")
try:
# Convert string address to multiaddr, then to peer info
relay_maddr = multiaddr.Multiaddr(relay_addr_str)
relay_peer_info = info_from_p2p_addr(relay_maddr)
await host.connect(relay_peer_info)
print("Connected to relay successfully")
# Add the relay to the transport's discovery
transport.discovery._add_relay(relay_peer_info.peer_id)
print(f"Added relay {relay_peer_info.peer_id} to discovery")
# Keep the node running
while True:
await trio.sleep(10)
print("Destination node still running...")
except Exception as e:
print(f"Failed to connect to relay: {e}")
traceback.print_exc()
if __name__ == "__main__":
print("Starting destination node...")
relay_id = None
if len(sys.argv) > 1:
relay_id = sys.argv[1]
print(f"Using provided relay ID: {relay_id}")
trio.run(run_destination, relay_id)
Source Node
-----------
Create a file named ``source_node.py`` with the following content:
.. code-block:: python
import trio
import logging
import multiaddr
import traceback
import sys
from libp2p import new_host
from libp2p.peer.peerinfo import PeerInfo
from libp2p.peer.id import ID
from libp2p.relay.circuit_v2.protocol import CircuitV2Protocol
from libp2p.relay.circuit_v2.transport import CircuitV2Transport
from libp2p.relay.circuit_v2.config import RelayConfig
from libp2p.peer.peerinfo import info_from_p2p_addr
from libp2p.tools.async_service import background_trio_service
from libp2p.relay.circuit_v2.discovery import RelayInfo
# Configure logging
logging.basicConfig(level=logging.DEBUG)
logger = logging.getLogger("source_node")
async def run_source(relay_peer_id=None, destination_peer_id=None):
# Create a libp2p host
listen_addr = multiaddr.Multiaddr("/ip4/0.0.0.0/tcp/9002")
host = new_host()
# Configure as a relay client
config = RelayConfig(
enable_client=True, # Use relays for outbound connections
max_circuit_duration=3600, # 1 hour
max_circuit_bytes=1024 * 1024 * 10, # 10MB
)
# Initialize the relay protocol
protocol = CircuitV2Protocol(host, limits=config.limits, allow_hop=False)
# Start the protocol service
async with host.run(listen_addrs=[listen_addr]):
# Print host information
print(f"Source node started with ID: {host.get_id()}")
print(f"Listening on: {host.get_addrs()}")
# Start the protocol service in the background
async with background_trio_service(protocol):
print("Protocol service started")
# Create and register the transport
transport = CircuitV2Transport(host, protocol, config)
# Get relay peer ID if not provided
if not relay_peer_id:
print("No relay peer ID provided. Please enter the relay's peer ID:")
while True:
if sys.stdin.isatty(): # Only try to read from stdin if it's a terminal
try:
relay_peer_id = input("Enter relay peer ID: ").strip()
if relay_peer_id:
break
except EOFError:
await trio.sleep(5)
else:
print("No terminal detected. Waiting for relay peer ID as command line argument.")
await trio.sleep(10)
continue
# Connect to the relay node with the provided relay peer ID
relay_addr_str = f"/ip4/127.0.0.1/tcp/9000/p2p/{relay_peer_id}"
print(f"Connecting to relay at {relay_addr_str}")
try:
# Convert string address to multiaddr, then to peer info
relay_maddr = multiaddr.Multiaddr(relay_addr_str)
relay_peer_info = info_from_p2p_addr(relay_maddr)
await host.connect(relay_peer_info)
print("Connected to relay successfully")
# Manually add the relay to the discovery service
relay_id = relay_peer_info.peer_id
now = trio.current_time()
# Create relay info and add it to discovery
relay_info = RelayInfo(
peer_id=relay_id,
discovered_at=now,
last_seen=now
)
transport.discovery._discovered_relays[relay_id] = relay_info
print(f"Added relay {relay_id} to discovery")
# Start relay discovery in the background
async with background_trio_service(transport.discovery):
print("Relay discovery started")
# Wait for relay discovery
await trio.sleep(5)
print("Relay discovery completed")
# Get destination peer ID if not provided
if not destination_peer_id:
print("No destination peer ID provided. Please enter the destination's peer ID:")
while True:
if sys.stdin.isatty(): # Only try to read from stdin if it's a terminal
try:
destination_peer_id = input("Enter destination peer ID: ").strip()
if destination_peer_id:
break
except EOFError:
await trio.sleep(5)
else:
print("No terminal detected. Waiting for destination peer ID as command line argument.")
await trio.sleep(10)
continue
print(f"Attempting to connect to {destination_peer_id} via relay")
# Check if we have any discovered relays
discovered_relays = list(transport.discovery._discovered_relays.keys())
print(f"Discovered relays: {discovered_relays}")
try:
# Create a circuit relay multiaddr for the destination
dest_id = ID.from_base58(destination_peer_id)
# Create a circuit multiaddr that includes the relay
# Format: /ip4/127.0.0.1/tcp/9000/p2p/RELAY_ID/p2p-circuit/p2p/DEST_ID
circuit_addr = multiaddr.Multiaddr(f"{relay_addr_str}/p2p-circuit/p2p/{destination_peer_id}")
print(f"Created circuit address: {circuit_addr}")
# Dial using the circuit address
connection = await transport.dial(circuit_addr)
print("Connection established through relay!")
# Open a stream using the echo protocol
stream = await connection.new_stream("/echo/1.0.0")
# Send messages periodically
for i in range(5):
message = f"Hello from source, message {i+1}"
print(f"Sending: {message}")
await stream.write(message.encode('utf-8'))
response = await stream.read(1024)
print(f"Received: {response.decode('utf-8')}")
await trio.sleep(1)
# Close the stream
await stream.close()
print("Stream closed")
except Exception as e:
print(f"Error connecting through relay: {e}")
print("Detailed error:")
traceback.print_exc()
# Keep the node running for a while
await trio.sleep(30)
print("Source node shutting down")
except Exception as e:
print(f"Error: {e}")
traceback.print_exc()
if __name__ == "__main__":
relay_id = None
dest_id = None
# Parse command line arguments if provided
if len(sys.argv) > 1:
relay_id = sys.argv[1]
print(f"Using provided relay ID: {relay_id}")
if len(sys.argv) > 2:
dest_id = sys.argv[2]
print(f"Using provided destination ID: {dest_id}")
trio.run(run_source, relay_id, dest_id)
Running the Example
-------------------
1. First, start the relay node:
.. code-block:: console
$ python relay_node.py
Created relay protocol with hop enabled: True
==================================================
Relay node started with ID: QmaUigQJ9nJERa6GaZuyfaiX91QjYwoQJ46JS3k7ys7SLx
Relay node multiaddr: /ip4/127.0.0.1/tcp/9000/p2p/QmaUigQJ9nJERa6GaZuyfaiX91QjYwoQJ46JS3k7ys7SLx
==================================================
Listening on: [<Multiaddr /ip4/0.0.0.0/tcp/9000/p2p/QmaUigQJ9nJERa6GaZuyfaiX91QjYwoQJ46JS3k7ys7SLx>]
Protocol service started
Relay service started successfully
Relay limits: RelayLimits(duration=3600, data=10485760, max_circuit_conns=8, max_reservations=4)
Note the relay node\'s peer ID (in this example: `QmaUigQJ9nJERa6GaZuyfaiX91QjYwoQJ46JS3k7ys7SLx`). You\'ll need this for the other nodes.
2. Next, start the destination node:
.. code-block:: console
$ python destination_node.py
Starting destination node...
==================================================
Destination node started with ID: QmPBr38KeQG2ibyL4fxq6yJWpfoVNCqJMHBdNyn1Qe4h5s
Use this ID in the source node: QmPBr38KeQG2ibyL4fxq6yJWpfoVNCqJMHBdNyn1Qe4h5s
==================================================
Listening on: [<Multiaddr /ip4/0.0.0.0/tcp/9001/p2p/QmPBr38KeQG2ibyL4fxq6yJWpfoVNCqJMHBdNyn1Qe4h5s>]
Registered echo protocol handler
Protocol service started
Transport created
Created relay listener
Destination node ready to accept relayed connections
No relay peer ID provided. Please enter the relay\'s peer ID:
Waiting for relay peer ID input...
Enter relay peer ID: QmaUigQJ9nJERa6GaZuyfaiX91QjYwoQJ46JS3k7ys7SLx
Connecting to relay at /ip4/127.0.0.1/tcp/9000/p2p/QmaUigQJ9nJERa6GaZuyfaiX91QjYwoQJ46JS3k7ys7SLx
Connected to relay successfully
Added relay QmaUigQJ9nJERa6GaZuyfaiX91QjYwoQJ46JS3k7ys7SLx to discovery
Destination node still running...
Note the destination node's peer ID (in this example: `QmPBr38KeQG2ibyL4fxq6yJWpfoVNCqJMHBdNyn1Qe4h5s`). You'll need this for the source node.
3. Finally, start the source node:
.. code-block:: console
$ python source_node.py
Source node started with ID: QmPyM56cgmFoHTgvMgGfDWRdVRQznmxCDDDg2dJ8ygVXj3
Listening on: [<Multiaddr /ip4/0.0.0.0/tcp/9002/p2p/QmPyM56cgmFoHTgvMgGfDWRdVRQznmxCDDDg2dJ8ygVXj3>]
Protocol service started
No relay peer ID provided. Please enter the relay\'s peer ID:
Enter relay peer ID: QmaUigQJ9nJERa6GaZuyfaiX91QjYwoQJ46JS3k7ys7SLx
Connecting to relay at /ip4/127.0.0.1/tcp/9000/p2p/QmaUigQJ9nJERa6GaZuyfaiX91QjYwoQJ46JS3k7ys7SLx
Connected to relay successfully
Added relay QmaUigQJ9nJERa6GaZuyfaiX91QjYwoQJ46JS3k7ys7SLx to discovery
Relay discovery started
Relay discovery completed
No destination peer ID provided. Please enter the destination\'s peer ID:
Enter destination peer ID: QmPBr38KeQG2ibyL4fxq6yJWpfoVNCqJMHBdNyn1Qe4h5s
Attempting to connect to QmPBr38KeQG2ibyL4fxq6yJWpfoVNCqJMHBdNyn1Qe4h5s via relay
Discovered relays: [<libp2p.peer.id.ID (QmaUigQJ9nJERa6GaZuyfaiX91QjYwoQJ46JS3k7ys7SLx)>]
Created circuit address: /ip4/127.0.0.1/tcp/9000/p2p/QmaUigQJ9nJERa6GaZuyfaiX91QjYwoQJ46JS3k7ys7SLx/p2p-circuit/p2p/QmPBr38KeQG2ibyL4fxq6yJWpfoVNCqJMHBdNyn1Qe4h5s
At this point, the source node will establish a connection through the relay to the destination node and start sending messages.
4. Alternatively, you can provide the peer IDs as command-line arguments:
.. code-block:: console
# For the destination node (provide relay ID)
$ python destination_node.py QmaUigQJ9nJERa6GaZuyfaiX91QjYwoQJ46JS3k7ys7SLx
# For the source node (provide both relay and destination IDs)
$ python source_node.py QmaUigQJ9nJERa6GaZuyfaiX91QjYwoQJ46JS3k7ys7SLx QmPBr38KeQG2ibyL4fxq6yJWpfoVNCqJMHBdNyn1Qe4h5s
This example demonstrates how to use Circuit Relay v2 to establish connections between peers that cannot connect directly. The peer IDs are dynamically generated for each node, and the relay facilitates communication between the source and destination nodes.

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Kademlia DHT Demo
=================
This example demonstrates a Kademlia Distributed Hash Table (DHT) implementation with both value storage/retrieval and content provider advertisement/discovery functionality.
.. code-block:: console
$ python -m pip install libp2p
Collecting libp2p
...
Successfully installed libp2p-x.x.x
$ cd examples/kademlia
$ python kademlia.py --mode server
2025-06-13 19:51:25,424 - kademlia-example - INFO - Running in server mode on port 0
2025-06-13 19:51:25,426 - kademlia-example - INFO - Connected to bootstrap nodes: []
2025-06-13 19:51:25,426 - kademlia-example - INFO - To connect to this node, use: --bootstrap /ip4/127.0.0.1/tcp/28910/p2p/16Uiu2HAm7EsNv5vvjPAehGAVfChjYjD63ZHyWogQRdzntSbAg9ef
2025-06-13 19:51:25,426 - kademlia-example - INFO - Saved server address to log: /ip4/127.0.0.1/tcp/28910/p2p/16Uiu2HAm7EsNv5vvjPAehGAVfChjYjD63ZHyWogQRdzntSbAg9ef
2025-06-13 19:51:25,427 - kademlia-example - INFO - DHT service started in SERVER mode
2025-06-13 19:51:25,427 - kademlia-example - INFO - Stored value 'Hello message from Sumanjeet' with key: FVDjasarSFDoLPMdgnp1dHSbW2ZAfN8NU2zNbCQeczgP
2025-06-13 19:51:25,427 - kademlia-example - INFO - Successfully advertised as server for content: 361f2ed1183bca491b8aec11f0b9e5c06724759b0f7480ae7fb4894901993bc8
Copy the line that starts with ``--bootstrap``, open a new terminal in the same folder and run the client:
.. code-block:: console
$ python kademlia.py --mode client --bootstrap /ip4/127.0.0.1/tcp/28910/p2p/16Uiu2HAm7EsNv5vvjPAehGAVfChjYjD63ZHyWogQRdzntSbAg9ef
2025-06-13 19:51:37,022 - kademlia-example - INFO - Running in client mode on port 0
2025-06-13 19:51:37,026 - kademlia-example - INFO - Connected to bootstrap nodes: [<libp2p.peer.id.ID (16Uiu2HAm7EsNv5vvjPAehGAVfChjYjD63ZHyWogQRdzntSbAg9ef)>]
2025-06-13 19:51:37,027 - kademlia-example - INFO - DHT service started in CLIENT mode
2025-06-13 19:51:37,027 - kademlia-example - INFO - Looking up key: FVDjasarSFDoLPMdgnp1dHSbW2ZAfN8NU2zNbCQeczgP
2025-06-13 19:51:37,031 - kademlia-example - INFO - Retrieved value: Hello message from Sumanjeet
2025-06-13 19:51:37,031 - kademlia-example - INFO - Looking for servers of content: 361f2ed1183bca491b8aec11f0b9e5c06724759b0f7480ae7fb4894901993bc8
2025-06-13 19:51:37,035 - kademlia-example - INFO - Found 1 servers for content: ['16Uiu2HAm7EsNv5vvjPAehGAVfChjYjD63ZHyWogQRdzntSbAg9ef']
Alternatively, if you run the server first, the client can automatically extract the bootstrap address from the server log file:
.. code-block:: console
$ python kademlia.py --mode client
2025-06-13 19:51:37,022 - kademlia-example - INFO - Running in client mode on port 0
2025-06-13 19:51:37,026 - kademlia-example - INFO - Connected to bootstrap nodes: [<libp2p.peer.id.ID (16Uiu2HAm7EsNv5vvjPAehGAVfChjYjD63ZHyWogQRdzntSbAg9ef)>]
2025-06-13 19:51:37,027 - kademlia-example - INFO - DHT service started in CLIENT mode
2025-06-13 19:51:37,027 - kademlia-example - INFO - Looking up key: FVDjasarSFDoLPMdgnp1dHSbW2ZAfN8NU2zNbCQeczgP
2025-06-13 19:51:37,031 - kademlia-example - INFO - Retrieved value: Hello message from Sumanjeet
2025-06-13 19:51:37,031 - kademlia-example - INFO - Looking for servers of content: 361f2ed1183bca491b8aec11f0b9e5c06724759b0f7480ae7fb4894901993bc8
2025-06-13 19:51:37,035 - kademlia-example - INFO - Found 1 servers for content: ['16Uiu2HAm7EsNv5vvjPAehGAVfChjYjD63ZHyWogQRdzntSbAg9ef']
The demo showcases key DHT operations:
- **Value Storage & Retrieval**: The server stores a value, and the client retrieves it
- **Content Provider Discovery**: The server advertises content, and the client finds providers
- **Peer Discovery**: Automatic bootstrap and peer routing using the Kademlia algorithm
- **Network Resilience**: Distributed storage across multiple nodes (when available)
Command Line Options
--------------------
The Kademlia demo supports several command line options for customization:
.. code-block:: console
$ python kademlia.py --help
usage: kademlia.py [-h] [--mode MODE] [--port PORT] [--bootstrap [BOOTSTRAP ...]] [--verbose]
Kademlia DHT example with content server functionality
options:
-h, --help show this help message and exit
--mode MODE Run as a server or client node (default: server)
--port PORT Port to listen on (0 for random) (default: 0)
--bootstrap [BOOTSTRAP ...]
Multiaddrs of bootstrap nodes. Provide a space-separated list of addresses.
This is required for client mode.
--verbose Enable verbose logging
**Examples:**
Start server on a specific port:
.. code-block:: console
$ python kademlia.py --mode server --port 8000
Start client with verbose logging:
.. code-block:: console
$ python kademlia.py --mode client --verbose
Connect to multiple bootstrap nodes:
.. code-block:: console
$ python kademlia.py --mode client --bootstrap /ip4/127.0.0.1/tcp/8000/p2p/... /ip4/127.0.0.1/tcp/8001/p2p/...
How It Works
------------
The Kademlia DHT implementation demonstrates several key concepts:
**Server Mode:**
- Stores key-value pairs in the distributed hash table
- Advertises itself as a content provider for specific content
- Handles incoming DHT requests from other nodes
- Maintains routing table with known peers
**Client Mode:**
- Connects to bootstrap nodes to join the network
- Retrieves values by their keys from the DHT
- Discovers content providers for specific content
- Performs network lookups using the Kademlia algorithm
**Key Components:**
- **Routing Table**: Organizes peers in k-buckets based on XOR distance
- **Value Store**: Manages key-value storage with TTL (time-to-live)
- **Provider Store**: Tracks which peers provide specific content
- **Peer Routing**: Implements iterative lookups to find closest peers
The full source code for this example is below:
.. literalinclude:: ../examples/kademlia/kademlia.py
:language: python
:linenos:

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mDNS Peer Discovery Example
===========================
This example demonstrates how to use mDNS (Multicast DNS) for peer discovery in py-libp2p.
Prerequisites
-------------
First, ensure you have py-libp2p installed and your environment is activated:
.. code-block:: console
$ python -m pip install libp2p
Running the Example
-------------------
The mDNS demo script allows you to discover peers on your local network using mDNS. To start a peer, run:
.. code-block:: console
$ mdns-demo
You should see output similar to:
.. code-block:: console
Run this from another console to start another peer on a different port:
python mdns-demo -p <ANOTHER_PORT>
Waiting for mDNS peer discovery events...
2025-06-20 23:28:12,052 - libp2p.example.discovery.mdns - INFO - Starting peer Discovery
To discover peers, open another terminal and run the same command with a different port:
.. code-block:: console
$ python mdns-demo -p 9001
You should see output indicating that a new peer has been discovered:
.. code-block:: console
Run this from the same folder in another console to start another peer on a different port:
python mdns-demo -p <ANOTHER_PORT>
Waiting for mDNS peer discovery events...
2025-06-20 23:43:43,786 - libp2p.example.discovery.mdns - INFO - Starting peer Discovery
2025-06-20 23:43:43,790 - libp2p.example.discovery.mdns - INFO - Discovered: 16Uiu2HAmGxy5NdQEjZWtrYUMrzdp3Syvg7MB2E5Lx8weA9DanYxj
When a new peer is discovered, its peer ID will be printed in the console output.
How it Works
------------
- Each node advertises itself on the local network using mDNS.
- When a new peer is discovered, the handler prints its peer ID.
- This is useful for local peer discovery without requiring a DHT or bootstrap nodes.
You can modify the script to perform additional actions when peers are discovered, such as opening streams or exchanging messages.

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Multiple Connections Per Peer
=============================
This example demonstrates how to use the multiple connections per peer feature in py-libp2p.
Overview
--------
The multiple connections per peer feature allows a libp2p node to maintain multiple network connections to the same peer. This provides several benefits:
- **Improved reliability**: If one connection fails, others remain available
- **Better performance**: Load can be distributed across multiple connections
- **Enhanced throughput**: Multiple streams can be created in parallel
- **Fault tolerance**: Redundant connections provide backup paths
Configuration
-------------
The feature is configured through the `ConnectionConfig` class:
.. code-block:: python
from libp2p.network.swarm import ConnectionConfig
# Default configuration
config = ConnectionConfig()
print(f"Max connections per peer: {config.max_connections_per_peer}")
print(f"Load balancing strategy: {config.load_balancing_strategy}")
# Custom configuration
custom_config = ConnectionConfig(
max_connections_per_peer=5,
connection_timeout=60.0,
load_balancing_strategy="least_loaded"
)
Load Balancing Strategies
-------------------------
Two load balancing strategies are available:
**Round Robin** (default)
Cycles through connections in order, distributing load evenly.
**Least Loaded**
Selects the connection with the fewest active streams.
API Usage
---------
The new API provides direct access to multiple connections:
.. code-block:: python
from libp2p import new_swarm
# Create swarm with multiple connections support
swarm = new_swarm()
# Dial a peer - returns list of connections
connections = await swarm.dial_peer(peer_id)
print(f"Established {len(connections)} connections")
# Get all connections to a peer
peer_connections = swarm.get_connections(peer_id)
# Get all connections (across all peers)
all_connections = swarm.get_connections()
# Get the complete connections map
connections_map = swarm.get_connections_map()
# Backward compatibility - get single connection
single_conn = swarm.get_connection(peer_id)
Backward Compatibility
----------------------
Existing code continues to work through backward compatibility features:
.. code-block:: python
# Legacy 1:1 mapping (returns first connection for each peer)
legacy_connections = swarm.connections_legacy
# Single connection access (returns first available connection)
conn = swarm.get_connection(peer_id)
Example
-------
A complete working example is available in the `examples/doc-examples/multiple_connections_example.py` file.
Production Configuration
-------------------------
For production use, consider these settings:
**RetryConfig Parameters**
The `RetryConfig` class controls connection retry behavior with exponential backoff:
- **max_retries**: Maximum number of retry attempts before giving up (default: 3)
- **initial_delay**: Initial delay in seconds before the first retry (default: 0.1s)
- **max_delay**: Maximum delay cap to prevent excessive wait times (default: 30.0s)
- **backoff_multiplier**: Exponential backoff multiplier - each retry multiplies delay by this factor (default: 2.0)
- **jitter_factor**: Random jitter (0.0-1.0) to prevent synchronized retries (default: 0.1)
**ConnectionConfig Parameters**
The `ConnectionConfig` class manages multi-connection behavior:
- **max_connections_per_peer**: Maximum connections allowed to a single peer (default: 3)
- **connection_timeout**: Timeout for establishing new connections in seconds (default: 30.0s)
- **load_balancing_strategy**: Strategy for distributing streams ("round_robin" or "least_loaded")
**Load Balancing Strategies Explained**
- **round_robin**: Cycles through connections in order, distributing load evenly. Simple and predictable.
- **least_loaded**: Selects the connection with the fewest active streams. Better for performance but more complex.
.. code-block:: python
from libp2p.network.swarm import ConnectionConfig, RetryConfig
# Production-ready configuration
retry_config = RetryConfig(
max_retries=3, # Maximum retry attempts before giving up
initial_delay=0.1, # Start with 100ms delay
max_delay=30.0, # Cap exponential backoff at 30 seconds
backoff_multiplier=2.0, # Double delay each retry (100ms -> 200ms -> 400ms)
jitter_factor=0.1 # Add 10% random jitter to prevent thundering herd
)
connection_config = ConnectionConfig(
max_connections_per_peer=3, # Allow up to 3 connections per peer
connection_timeout=30.0, # 30 second timeout for new connections
load_balancing_strategy="round_robin" # Simple, predictable load distribution
)
swarm = new_swarm(
retry_config=retry_config,
connection_config=connection_config
)
**How RetryConfig Works in Practice**
With the configuration above, connection retries follow this pattern:
1. **Attempt 1**: Immediate connection attempt
2. **Attempt 2**: Wait 100ms ± 10ms jitter, then retry
3. **Attempt 3**: Wait 200ms ± 20ms jitter, then retry
4. **Attempt 4**: Wait 400ms ± 40ms jitter, then retry
5. **Attempt 5**: Wait 800ms ± 80ms jitter, then retry
6. **Attempt 6**: Wait 1.6s ± 160ms jitter, then retry
7. **Attempt 7**: Wait 3.2s ± 320ms jitter, then retry
8. **Attempt 8**: Wait 6.4s ± 640ms jitter, then retry
9. **Attempt 9**: Wait 12.8s ± 1.28s jitter, then retry
10. **Attempt 10**: Wait 25.6s ± 2.56s jitter, then retry
11. **Attempt 11**: Wait 30.0s (capped) ± 3.0s jitter, then retry
12. **Attempt 12**: Wait 30.0s (capped) ± 3.0s jitter, then retry
13. **Give up**: After 12 retries (3 initial + 9 retries), connection fails
The jitter prevents multiple clients from retrying simultaneously, reducing server load.
**Parameter Tuning Guidelines**
**For Development/Testing:**
- Use lower `max_retries` (1-2) and shorter delays for faster feedback
- Example: `RetryConfig(max_retries=2, initial_delay=0.01, max_delay=0.1)`
**For Production:**
- Use moderate `max_retries` (3-5) with reasonable delays for reliability
- Example: `RetryConfig(max_retries=5, initial_delay=0.1, max_delay=60.0)`
**For High-Latency Networks:**
- Use higher `max_retries` (5-10) with longer delays
- Example: `RetryConfig(max_retries=8, initial_delay=0.5, max_delay=120.0)`
**For Load Balancing:**
- Use `round_robin` for simple, predictable behavior
- Use `least_loaded` when you need optimal performance and can handle complexity
Architecture
------------
The implementation follows the same architectural patterns as the Go and JavaScript reference implementations:
- **Core data structure**: `dict[ID, list[INetConn]]` for 1:many mapping
- **API consistency**: Methods like `get_connections()` match reference implementations
- **Load balancing**: Integrated at the API level for optimal performance
- **Backward compatibility**: Maintains existing interfaces for gradual migration
This design ensures consistency across libp2p implementations while providing the benefits of multiple connections per peer.

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Random Walk Example
===================
This example demonstrates the Random Walk module's peer discovery capabilities using real libp2p hosts and Kademlia DHT.
It shows how the Random Walk module automatically discovers new peers and maintains routing table health.
The Random Walk implementation performs the following key operations:
* **Automatic Peer Discovery**: Generates random peer IDs and queries the DHT network to discover new peers
* **Routing Table Maintenance**: Periodically refreshes the routing table to maintain network connectivity
* **Connection Management**: Maintains optimal connections to healthy peers in the network
* **Real-time Statistics**: Displays routing table size, connected peers, and peerstore statistics
.. code-block:: console
$ python -m pip install libp2p
Collecting libp2p
...
Successfully installed libp2p-x.x.x
$ cd examples/random_walk
$ python random_walk.py --mode server
2025-08-12 19:51:25,424 - random-walk-example - INFO - === Random Walk Example for py-libp2p ===
2025-08-12 19:51:25,424 - random-walk-example - INFO - Mode: server, Port: 0 Demo interval: 30s
2025-08-12 19:51:25,426 - random-walk-example - INFO - Starting server node on port 45123
2025-08-12 19:51:25,426 - random-walk-example - INFO - Node peer ID: 16Uiu2HAm7EsNv5vvjPAehGAVfChjYjD63ZHyWogQRdzntSbAg9ef
2025-08-12 19:51:25,426 - random-walk-example - INFO - Node address: /ip4/0.0.0.0/tcp/45123/p2p/16Uiu2HAm7EsNv5vvjPAehGAVfChjYjD63ZHyWogQRdzntSbAg9ef
2025-08-12 19:51:25,427 - random-walk-example - INFO - Initial routing table size: 0
2025-08-12 19:51:25,427 - random-walk-example - INFO - DHT service started in SERVER mode
2025-08-12 19:51:25,430 - libp2p.discovery.random_walk.rt_refresh_manager - INFO - RT Refresh Manager started
2025-08-12 19:51:55,432 - random-walk-example - INFO - --- Iteration 1 ---
2025-08-12 19:51:55,432 - random-walk-example - INFO - Routing table size: 15
2025-08-12 19:51:55,432 - random-walk-example - INFO - Connected peers: 8
2025-08-12 19:51:55,432 - random-walk-example - INFO - Peerstore size: 42
You can also run the example in client mode:
.. code-block:: console
$ python random_walk.py --mode client
2025-08-12 19:52:15,424 - random-walk-example - INFO - === Random Walk Example for py-libp2p ===
2025-08-12 19:52:15,424 - random-walk-example - INFO - Mode: client, Port: 0 Demo interval: 30s
2025-08-12 19:52:15,426 - random-walk-example - INFO - Starting client node on port 51234
2025-08-12 19:52:15,426 - random-walk-example - INFO - Node peer ID: 16Uiu2HAmAbc123xyz...
2025-08-12 19:52:15,427 - random-walk-example - INFO - DHT service started in CLIENT mode
2025-08-12 19:52:45,432 - random-walk-example - INFO - --- Iteration 1 ---
2025-08-12 19:52:45,432 - random-walk-example - INFO - Routing table size: 8
2025-08-12 19:52:45,432 - random-walk-example - INFO - Connected peers: 5
2025-08-12 19:52:45,432 - random-walk-example - INFO - Peerstore size: 25
Command Line Options
--------------------
The example supports several command-line options:
.. code-block:: console
$ python random_walk.py --help
usage: random_walk.py [-h] [--mode {server,client}] [--port PORT]
[--demo-interval DEMO_INTERVAL] [--verbose]
Random Walk Example for py-libp2p Kademlia DHT
optional arguments:
-h, --help show this help message and exit
--mode {server,client}
Node mode: server (DHT server), or client (DHT client)
--port PORT Port to listen on (0 for random)
--demo-interval DEMO_INTERVAL
Interval between random walk demonstrations in seconds
--verbose Enable verbose logging
Key Features Demonstrated
-------------------------
**Automatic Random Walk Discovery**
The example shows how the Random Walk module automatically:
* Generates random 256-bit peer IDs for discovery queries
* Performs concurrent random walks to maximize peer discovery
* Validates discovered peers and adds them to the routing table
* Maintains routing table health through periodic refreshes
**Real-time Network Statistics**
The example displays live statistics every 30 seconds (configurable):
* **Routing Table Size**: Number of peers in the Kademlia routing table
* **Connected Peers**: Number of actively connected peers
* **Peerstore Size**: Total number of known peers with addresses
**Connection Management**
The example includes sophisticated connection management:
* Automatically maintains connections to healthy peers
* Filters for compatible peers (TCP + IPv4 addresses)
* Reconnects to maintain optimal network connectivity
* Handles connection failures gracefully
**DHT Integration**
Shows seamless integration between Random Walk and Kademlia DHT:
* RT Refresh Manager coordinates with the DHT routing table
* Peer discovery feeds directly into DHT operations
* Both SERVER and CLIENT modes supported
* Bootstrap connectivity to public IPFS nodes
Understanding the Output
------------------------
When you run the example, you'll see periodic statistics that show how the Random Walk module is working:
* **Initial Phase**: Routing table starts empty and quickly discovers peers
* **Growth Phase**: Routing table size increases as more peers are discovered
* **Maintenance Phase**: Routing table size stabilizes as the system maintains optimal peer connections
The Random Walk module runs automatically in the background, performing peer discovery queries every few minutes to ensure the routing table remains populated with fresh, reachable peers.
Configuration
-------------
The Random Walk module can be configured through the following parameters in ``libp2p.discovery.random_walk.config``:
* ``RANDOM_WALK_ENABLED``: Enable/disable automatic random walks (default: True)
* ``REFRESH_INTERVAL``: Time between automatic refreshes in seconds (default: 300)
* ``RANDOM_WALK_CONCURRENCY``: Number of concurrent random walks (default: 3)
* ``MIN_RT_REFRESH_THRESHOLD``: Minimum routing table size before triggering refresh (default: 4)
See Also
--------
* :doc:`examples.kademlia` - Kademlia DHT value storage and content routing
* :doc:`libp2p.discovery.random_walk` - Random Walk module API documentation

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examples.echo
examples.ping
examples.pubsub
examples.circuit_relay
examples.kademlia
examples.mDNS
examples.random_walk
examples.multiple_connections

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@ -12,6 +12,10 @@ The Python implementation of the libp2p networking stack
getting_started
release_notes
.. toctree::
:maxdepth: 1
:caption: Community
.. toctree::
:maxdepth: 1
:caption: py-libp2p

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libp2p.discovery.bootstrap package
==================================
Submodules
----------
Module contents
---------------
.. automodule:: libp2p.discovery.bootstrap
:members:
:undoc-members:
:show-inheritance:

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libp2p.discovery.events package
===============================
Submodules
----------
libp2p.discovery.events.peerDiscovery module
--------------------------------------------
.. automodule:: libp2p.discovery.events.peerDiscovery
:members:
:undoc-members:
:show-inheritance:
Module contents
---------------
.. automodule:: libp2p.discovery.events
:members:
:undoc-members:
:show-inheritance:

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docs/libp2p.discovery.mdns.rst
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@ -1,45 +0,0 @@
libp2p.discovery.mdns package
=============================
Submodules
----------
libp2p.discovery.mdns.broadcaster module
----------------------------------------
.. automodule:: libp2p.discovery.mdns.broadcaster
:members:
:undoc-members:
:show-inheritance:
libp2p.discovery.mdns.listener module
-------------------------------------
.. automodule:: libp2p.discovery.mdns.listener
:members:
:undoc-members:
:show-inheritance:
libp2p.discovery.mdns.mdns module
---------------------------------
.. automodule:: libp2p.discovery.mdns.mdns
:members:
:undoc-members:
:show-inheritance:
libp2p.discovery.mdns.utils module
----------------------------------
.. automodule:: libp2p.discovery.mdns.utils
:members:
:undoc-members:
:show-inheritance:
Module contents
---------------
.. automodule:: libp2p.discovery.mdns
:members:
:undoc-members:
:show-inheritance:

48
docs/libp2p.discovery.random_walk.rst
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@ -1,48 +0,0 @@
libp2p.discovery.random_walk package
====================================
The Random Walk module implements a peer discovery mechanism.
It performs random walks through the DHT network to discover new peers and maintain routing table health through periodic refreshes.
Submodules
----------
libp2p.discovery.random_walk.config module
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. automodule:: libp2p.discovery.random_walk.config
:members:
:undoc-members:
:show-inheritance:
libp2p.discovery.random_walk.exceptions module
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. automodule:: libp2p.discovery.random_walk.exceptions
:members:
:undoc-members:
:show-inheritance:
libp2p.discovery.random_walk.random_walk module
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. automodule:: libp2p.discovery.random_walk.random_walk
:members:
:undoc-members:
:show-inheritance:
libp2p.discovery.random_walk.rt_refresh_manager module
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. automodule:: libp2p.discovery.random_walk.rt_refresh_manager
:members:
:undoc-members:
:show-inheritance:
Module contents
---------------
.. automodule:: libp2p.discovery.random_walk
:members:
:undoc-members:
:show-inheritance:

24
docs/libp2p.discovery.rst
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@ -1,24 +0,0 @@
libp2p.discovery package
========================
Subpackages
-----------
.. toctree::
:maxdepth: 4
libp2p.discovery.bootstrap
libp2p.discovery.events
libp2p.discovery.mdns
libp2p.discovery.random_walk
Submodules
----------
Module contents
---------------
.. automodule:: libp2p.discovery
:members:
:undoc-members:
:show-inheritance:

22
docs/libp2p.kad_dht.pb.rst
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@ -1,22 +0,0 @@
libp2p.kad\_dht.pb package
==========================
Submodules
----------
libp2p.kad_dht.pb.kademlia_pb2 module
-------------------------------------
.. automodule:: libp2p.kad_dht.pb.kademlia_pb2
:members:
:undoc-members:
:show-inheritance:
Module contents
---------------
.. automodule:: libp2p.kad_dht.pb
:no-index:
:members:
:undoc-members:
:show-inheritance:

77
docs/libp2p.kad_dht.rst
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@ -1,77 +0,0 @@
libp2p.kad\_dht package
=======================
Subpackages
-----------
.. toctree::
:maxdepth: 4
libp2p.kad_dht.pb
Submodules
----------
libp2p.kad\_dht.kad\_dht module
-------------------------------
.. automodule:: libp2p.kad_dht.kad_dht
:members:
:undoc-members:
:show-inheritance:
libp2p.kad\_dht.peer\_routing module
------------------------------------
.. automodule:: libp2p.kad_dht.peer_routing
:members:
:undoc-members:
:show-inheritance:
libp2p.kad\_dht.provider\_store module
--------------------------------------
.. automodule:: libp2p.kad_dht.provider_store
:members:
:undoc-members:
:show-inheritance:
libp2p.kad\_dht.routing\_table module
-------------------------------------
.. automodule:: libp2p.kad_dht.routing_table
:members:
:undoc-members:
:show-inheritance:
libp2p.kad\_dht.utils module
----------------------------
.. automodule:: libp2p.kad_dht.utils
:members:
:undoc-members:
:show-inheritance:
libp2p.kad\_dht.value\_store module
-----------------------------------
.. automodule:: libp2p.kad_dht.value_store
:members:
:undoc-members:
:show-inheritance:
libp2p.kad\_dht.pb
------------------
.. automodule:: libp2p.kad_dht.pb
:members:
:undoc-members:
:show-inheritance:
Module contents
---------------
.. automodule:: libp2p.kad_dht
:members:
:undoc-members:
:show-inheritance:

22
docs/libp2p.relay.circuit_v2.pb.rst
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@ -1,22 +0,0 @@
libp2p.relay.circuit_v2.pb package
==================================
Submodules
----------
libp2p.relay.circuit_v2.pb.circuit_pb2 module
---------------------------------------------
.. automodule:: libp2p.relay.circuit_v2.pb.circuit_pb2
:members:
:show-inheritance:
:undoc-members:
Module contents
---------------
.. automodule:: libp2p.relay.circuit_v2.pb
:members:
:show-inheritance:
:undoc-members:
:no-index:

70
docs/libp2p.relay.circuit_v2.rst
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@ -1,70 +0,0 @@
libp2p.relay.circuit_v2 package
===============================
Subpackages
-----------
.. toctree::
:maxdepth: 4
libp2p.relay.circuit_v2.pb
Submodules
----------
libp2p.relay.circuit_v2.protocol module
---------------------------------------
.. automodule:: libp2p.relay.circuit_v2.protocol
:members:
:show-inheritance:
:undoc-members:
libp2p.relay.circuit_v2.transport module
----------------------------------------
.. automodule:: libp2p.relay.circuit_v2.transport
:members:
:show-inheritance:
:undoc-members:
libp2p.relay.circuit_v2.discovery module
----------------------------------------
.. automodule:: libp2p.relay.circuit_v2.discovery
:members:
:show-inheritance:
:undoc-members:
libp2p.relay.circuit_v2.resources module
----------------------------------------
.. automodule:: libp2p.relay.circuit_v2.resources
:members:
:show-inheritance:
:undoc-members:
libp2p.relay.circuit_v2.config module
-------------------------------------
.. automodule:: libp2p.relay.circuit_v2.config
:members:
:show-inheritance:
:undoc-members:
libp2p.relay.circuit_v2.protocol_buffer module
----------------------------------------------
.. automodule:: libp2p.relay.circuit_v2.protocol_buffer
:members:
:show-inheritance:
:undoc-members:
Module contents
---------------
.. automodule:: libp2p.relay.circuit_v2
:members:
:show-inheritance:
:undoc-members:
:no-index:

19
docs/libp2p.relay.rst
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@ -1,19 +0,0 @@
libp2p.relay package
====================
Subpackages
-----------
.. toctree::
:maxdepth: 4
libp2p.relay.circuit_v2
Module contents
---------------
.. automodule:: libp2p.relay
:members:
:show-inheritance:
:undoc-members:
:no-index:

3
docs/libp2p.rst
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@ -8,16 +8,13 @@ Subpackages
:maxdepth: 4
libp2p.crypto
libp2p.discovery
libp2p.host
libp2p.identity
libp2p.io
libp2p.kad_dht
libp2p.network
libp2p.peer
libp2p.protocol_muxer
libp2p.pubsub
libp2p.relay
libp2p.security
libp2p.stream_muxer
libp2p.tools

104
docs/release_notes.rst
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@ -3,110 +3,6 @@ Release Notes
.. towncrier release notes start
py-libp2p v0.2.9 (2025-07-09)
-----------------------------
Breaking Changes
~~~~~~~~~~~~~~~~
- Reordered the arguments to ``upgrade_security`` to place ``is_initiator`` before ``peer_id``, and made ``peer_id`` optional.
This allows the method to reflect the fact that peer identity is not required for inbound connections. (`#681 <https://github.com/libp2p/py-libp2p/issues/681>`__)
Bugfixes
~~~~~~~~
- Add timeout wrappers in:
1. ``multiselect.py``: ``negotiate`` function
2. ``multiselect_client.py``: ``select_one_of`` , ``query_multistream_command`` functions
to prevent indefinite hangs when a remote peer does not respond. (`#696 <https://github.com/libp2p/py-libp2p/issues/696>`__)
- Align stream creation logic with yamux specification (`#701 <https://github.com/libp2p/py-libp2p/issues/701>`__)
- Fixed an issue in ``Pubsub`` where async validators were not handled reliably under concurrency. Now uses a safe aggregator list for consistent behavior. (`#702 <https://github.com/libp2p/py-libp2p/issues/702>`__)
Features
~~~~~~~~
- Added support for ``Kademlia DHT`` in py-libp2p. (`#579 <https://github.com/libp2p/py-libp2p/issues/579>`__)
- Limit concurrency in ``push_identify_to_peers`` to prevent resource congestion under high peer counts. (`#621 <https://github.com/libp2p/py-libp2p/issues/621>`__)
- Store public key and peer ID in peerstore during handshake
Modified the InsecureTransport class to accept an optional peerstore parameter and updated the handshake process to store the received public key and peer ID in the peerstore when available.
Added test cases to verify:
1. The peerstore remains unchanged when handshake fails due to peer ID mismatch
2. The handshake correctly adds a public key to a peer ID that already exists in the peerstore but doesn't have a public key yet (`#631 <https://github.com/libp2p/py-libp2p/issues/631>`__)
- Fixed several flow-control and concurrency issues in the ``YamuxStream`` class. Previously, stress-testing revealed that transferring data over ``DEFAULT_WINDOW_SIZE`` would break the stream due to inconsistent window update handling and lock management. The fixes include:
- Removed sending of window updates during writes to maintain correct flow-control.
- Added proper timeout handling when releasing and acquiring locks to prevent concurrency errors.
- Corrected the ``read`` function to properly handle window updates for both ``read_until_EOF`` and ``read_n_bytes``.
- Added event logging at ``send_window_updates`` and ``waiting_for_window_updates`` for better observability. (`#639 <https://github.com/libp2p/py-libp2p/issues/639>`__)
- Added support for ``Multicast DNS`` in py-libp2p (`#649 <https://github.com/libp2p/py-libp2p/issues/649>`__)
- Optimized pubsub publishing to send multiple topics in a single message instead of separate messages per topic. (`#685 <https://github.com/libp2p/py-libp2p/issues/685>`__)
- Optimized pubsub message writing by implementing a write_msg() method that uses pre-allocated buffers and single write operations, improving performance by eliminating separate varint prefix encoding and write operations in FloodSub and GossipSub. (`#687 <https://github.com/libp2p/py-libp2p/issues/687>`__)
- Added peer exchange and backoff logic as part of Gossipsub v1.1 upgrade (`#690 <https://github.com/libp2p/py-libp2p/issues/690>`__)
Internal Changes - for py-libp2p Contributors
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- Added sparse connect utility function to pubsub test utilities for creating test networks with configurable connectivity. (`#679 <https://github.com/libp2p/py-libp2p/issues/679>`__)
- Added comprehensive tests for pubsub connection utility functions to verify degree limits are enforced, excess peers are handled correctly, and edge cases (degree=0, negative values, empty lists) are managed gracefully. (`#707 <https://github.com/libp2p/py-libp2p/issues/707>`__)
- Added extra tests for identify push concurrency cap under high peer load (`#708 <https://github.com/libp2p/py-libp2p/issues/708>`__)
Miscellaneous Changes
~~~~~~~~~~~~~~~~~~~~~
- `#678 <https://github.com/libp2p/py-libp2p/issues/678>`__, `#684 <https://github.com/libp2p/py-libp2p/issues/684>`__
py-libp2p v0.2.8 (2025-06-10)
-----------------------------
Breaking Changes
~~~~~~~~~~~~~~~~
- The `NetStream.state` property is now async and requires `await`. Update any direct state access to use `await stream.state`. (`#300 <https://github.com/libp2p/py-libp2p/issues/300>`__)
Bugfixes
~~~~~~~~
- Added proper state management and resource cleanup to `NetStream`, fixing memory leaks and improved error handling. (`#300 <https://github.com/libp2p/py-libp2p/issues/300>`__)
Improved Documentation
~~~~~~~~~~~~~~~~~~~~~~
- Updated examples to automatically use random port, when `-p` flag is not given (`#661 <https://github.com/libp2p/py-libp2p/issues/661>`__)
Features
~~~~~~~~
- Allow passing `listen_addrs` to `new_swarm` to customize swarm listening behavior. (`#616 <https://github.com/libp2p/py-libp2p/issues/616>`__)
- Feature: Support for sending `ls` command over `multistream-select` to list supported protocols from remote peer.
This allows inspecting which protocol handlers a peer supports at runtime. (`#622 <https://github.com/libp2p/py-libp2p/issues/622>`__)
- implement AsyncContextManager for IMuxedStream to support async with (`#629 <https://github.com/libp2p/py-libp2p/issues/629>`__)
- feat: add method to compute time since last message published by a peer and remove fanout peers based on ttl. (`#636 <https://github.com/libp2p/py-libp2p/issues/636>`__)
- implement blacklist management for `pubsub.Pubsub` with methods to get, add, remove, check, and clear blacklisted peer IDs. (`#641 <https://github.com/libp2p/py-libp2p/issues/641>`__)
- fix: remove expired peers from peerstore based on TTL (`#650 <https://github.com/libp2p/py-libp2p/issues/650>`__)
Internal Changes - for py-libp2p Contributors
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- Modernizes several aspects of the project, notably using ``pyproject.toml`` for project info instead of ``setup.py``, using ``ruff`` to replace several separate linting tools, and ``pyrefly`` in addition to ``mypy`` for typing. Also includes changes across the codebase to conform to new linting and typing rules. (`#618 <https://github.com/libp2p/py-libp2p/issues/618>`__)
Removals
~~~~~~~~
- Removes support for python 3.9 and updates some code conventions, notably using ``|`` operator in typing instead of ``Optional`` or ``Union`` (`#618 <https://github.com/libp2p/py-libp2p/issues/618>`__)
py-libp2p v0.2.7 (2025-05-22)
-----------------------------

63
examples/advanced/network_discover.py
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@ -1,63 +0,0 @@
"""
Advanced demonstration of Thin Waist address handling.
Run:
python -m examples.advanced.network_discovery
"""
from __future__ import annotations
from multiaddr import Multiaddr
try:
from libp2p.utils.address_validation import (
expand_wildcard_address,
get_available_interfaces,
get_optimal_binding_address,
)
except ImportError:
# Fallbacks if utilities are missing
def get_available_interfaces(port: int, protocol: str = "tcp"):
return [Multiaddr(f"/ip4/0.0.0.0/{protocol}/{port}")]
def expand_wildcard_address(addr: Multiaddr, port: int | None = None):
if port is None:
return [addr]
addr_str = str(addr).rsplit("/", 1)[0]
return [Multiaddr(addr_str + f"/{port}")]
def get_optimal_binding_address(port: int, protocol: str = "tcp"):
return Multiaddr(f"/ip4/0.0.0.0/{protocol}/{port}")
def main() -> None:
port = 8080
interfaces = get_available_interfaces(port)
print(f"Discovered interfaces for port {port}:")
for a in interfaces:
print(f" - {a}")
wildcard_v4 = Multiaddr(f"/ip4/0.0.0.0/tcp/{port}")
expanded_v4 = expand_wildcard_address(wildcard_v4)
print("\nExpanded IPv4 wildcard:")
for a in expanded_v4:
print(f" - {a}")
wildcard_v6 = Multiaddr(f"/ip6/::/tcp/{port}")
expanded_v6 = expand_wildcard_address(wildcard_v6)
print("\nExpanded IPv6 wildcard:")
for a in expanded_v6:
print(f" - {a}")
print("\nOptimal binding address heuristic result:")
print(f" -> {get_optimal_binding_address(port)}")
override_port = 9000
overridden = expand_wildcard_address(wildcard_v4, port=override_port)
print(f"\nPort override expansion to {override_port}:")
for a in overridden:
print(f" - {a}")
if __name__ == "__main__":
main()

136
examples/bootstrap/bootstrap.py
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@ -1,136 +0,0 @@
import argparse
import logging
import secrets
import multiaddr
import trio
from libp2p import new_host
from libp2p.abc import PeerInfo
from libp2p.crypto.secp256k1 import create_new_key_pair
from libp2p.discovery.events.peerDiscovery import peerDiscovery
# Configure logging
logger = logging.getLogger("libp2p.discovery.bootstrap")
logger.setLevel(logging.INFO)
handler = logging.StreamHandler()
handler.setFormatter(
logging.Formatter("%(asctime)s - %(name)s - %(levelname)s - %(message)s")
)
logger.addHandler(handler)
# Configure root logger to only show warnings and above to reduce noise
# This prevents verbose DEBUG messages from multiaddr, DNS, etc.
logging.getLogger().setLevel(logging.WARNING)
# Specifically silence noisy libraries
logging.getLogger("multiaddr").setLevel(logging.WARNING)
logging.getLogger("root").setLevel(logging.WARNING)
def on_peer_discovery(peer_info: PeerInfo) -> None:
"""Handler for peer discovery events."""
logger.info(f"🔍 Discovered peer: {peer_info.peer_id}")
logger.debug(f" Addresses: {[str(addr) for addr in peer_info.addrs]}")
# Example bootstrap peers
BOOTSTRAP_PEERS = [
"/dnsaddr/github.com/p2p/QmNnooDu7bfjPFoTZYxMNLWUQJyrVwtbZg5gBMjTezGAJN",
"/dnsaddr/cloudflare.com/p2p/QmNnooDu7bfjPFoTZYxMNLWUQJyrVwtbZg5gBMjTezGAJN",
"/dnsaddr/google.com/p2p/QmNnooDu7bfjPFoTZYxMNLWUQJyrVwtbZg5gBMjTezGAJN",
"/dnsaddr/bootstrap.libp2p.io/p2p/QmNnooDu7bfjPFoTZYxMNLWUQJyrVwtbZg5gBMjTezGAJN",
"/dnsaddr/bootstrap.libp2p.io/p2p/QmbLHAnMoJPWSCR5Zhtx6BHJX9KiKNN6tpvbUcqanj75Nb",
"/ip4/104.131.131.82/tcp/4001/p2p/QmaCpDMGvV2BGHeYERUEnRQAwe3N8SzbUtfsmvsqQLuvuJ",
"/ip6/2604:a880:1:20::203:d001/tcp/4001/p2p/QmSoLPppuBtQSGwKDZT2M73ULpjvfd3aZ6ha4oFGL1KrGM",
"/ip4/128.199.219.111/tcp/4001/p2p/QmSoLV4Bbm51jM9C4gDYZQ9Cy3U6aXMJDAbzgu2fzaDs64",
"/ip4/104.236.76.40/tcp/4001/p2p/QmSoLV4Bbm51jM9C4gDYZQ9Cy3U6aXMJDAbzgu2fzaDs64",
"/ip4/178.62.158.247/tcp/4001/p2p/QmSoLer265NRgSp2LA3dPaeykiS1J6DifTC88f5uVQKNAd",
"/ip6/2604:a880:1:20::203:d001/tcp/4001/p2p/QmSoLPppuBtQSGwKDZT2M73ULpjvfd3aZ6ha4oFGL1KrGM",
"/ip6/2400:6180:0:d0::151:6001/tcp/4001/p2p/QmSoLSafTMBsPKadTEgaXctDQVcqN88CNLHXMkTNwMKPnu",
"/ip6/2a03:b0c0:0:1010::23:1001/tcp/4001/p2p/QmSoLueR4xBeUbY9WZ9xGUUxunbKWcrNFTDAadQJmocnWm",
]
async def run(port: int, bootstrap_addrs: list[str]) -> None:
"""Run the bootstrap discovery example."""
# Generate key pair
secret = secrets.token_bytes(32)
key_pair = create_new_key_pair(secret)
# Create listen address
listen_addr = multiaddr.Multiaddr(f"/ip4/0.0.0.0/tcp/{port}")
# Register peer discovery handler
peerDiscovery.register_peer_discovered_handler(on_peer_discovery)
logger.info("🚀 Starting Bootstrap Discovery Example")
logger.info(f"📍 Listening on: {listen_addr}")
logger.info(f"🌐 Bootstrap peers: {len(bootstrap_addrs)}")
print("\n" + "=" * 60)
print("Bootstrap Discovery Example")
print("=" * 60)
print("This example demonstrates connecting to bootstrap peers.")
print("Watch the logs for peer discovery events!")
print("Press Ctrl+C to exit.")
print("=" * 60)
# Create and run host with bootstrap discovery
host = new_host(key_pair=key_pair, bootstrap=bootstrap_addrs)
try:
async with host.run(listen_addrs=[listen_addr]):
# Keep running and log peer discovery events
await trio.sleep_forever()
except KeyboardInterrupt:
logger.info("👋 Shutting down...")
def main() -> None:
"""Main entry point."""
description = """
Bootstrap Discovery Example for py-libp2p
This example demonstrates how to use bootstrap peers for peer discovery.
Bootstrap peers are predefined peers that help new nodes join the network.
Usage:
python bootstrap.py -p 8000
python bootstrap.py -p 8001 --custom-bootstrap \\
"/ip4/127.0.0.1/tcp/8000/p2p/QmYourPeerID"
"""
parser = argparse.ArgumentParser(
description=description, formatter_class=argparse.RawDescriptionHelpFormatter
)
parser.add_argument(
"-p", "--port", default=0, type=int, help="Port to listen on (default: random)"
)
parser.add_argument(
"--custom-bootstrap",
nargs="*",
help="Custom bootstrap addresses (space-separated)",
)
parser.add_argument(
"-v", "--verbose", action="store_true", help="Enable verbose output"
)
args = parser.parse_args()
if args.verbose:
logger.setLevel(logging.DEBUG)
# Use custom bootstrap addresses if provided, otherwise use defaults
bootstrap_addrs = (
args.custom_bootstrap if args.custom_bootstrap else BOOTSTRAP_PEERS
)
try:
trio.run(run, args.port, bootstrap_addrs)
except KeyboardInterrupt:
logger.info("Exiting...")
if __name__ == "__main__":
main()

3
examples/chat/chat.py
View File

@ -43,9 +43,6 @@ async def run(port: int, destination: str) -> None:
listen_addr = multiaddr.Multiaddr(f"/ip4/0.0.0.0/tcp/{port}")
host = new_host()
async with host.run(listen_addrs=[listen_addr]), trio.open_nursery() as nursery:
# Start the peer-store cleanup task
nursery.start_soon(host.get_peerstore().start_cleanup_task, 60)
if not destination: # its the server
async def stream_handler(stream: INetStream) -> None:

6
examples/doc-examples/example_encryption_insecure.py
View File

@ -24,12 +24,6 @@ async def main():
insecure_transport = InsecureTransport(
# local_key_pair: The key pair used for libp2p identity
local_key_pair=key_pair,
# secure_bytes_provider: Optional function to generate secure random bytes
# (defaults to secrets.token_bytes)
secure_bytes_provider=None, # Use default implementation
# peerstore: Optional peerstore to store peer IDs and public keys
# (defaults to None)
peerstore=None,
)
# Create a security options dictionary mapping protocol ID to transport

170
examples/doc-examples/multiple_connections_example.py
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@ -1,170 +0,0 @@
#!/usr/bin/env python3
"""
Example demonstrating multiple connections per peer support in libp2p.
This example shows how to:
1. Configure multiple connections per peer
2. Use different load balancing strategies
3. Access multiple connections through the new API
4. Maintain backward compatibility
"""
import logging
import trio
from libp2p import new_swarm
from libp2p.network.swarm import ConnectionConfig, RetryConfig
# Set up logging
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)
async def example_basic_multiple_connections() -> None:
"""Example of basic multiple connections per peer usage."""
logger.info("Creating swarm with multiple connections support...")
# Create swarm with default configuration
swarm = new_swarm()
default_connection = ConnectionConfig()
logger.info(f"Swarm created with peer ID: {swarm.get_peer_id()}")
logger.info(
f"Connection config: max_connections_per_peer="
f"{default_connection.max_connections_per_peer}"
)
await swarm.close()
logger.info("Basic multiple connections example completed")
async def example_custom_connection_config() -> None:
"""Example of custom connection configuration."""
logger.info("Creating swarm with custom connection configuration...")
# Custom connection configuration for high-performance scenarios
connection_config = ConnectionConfig(
max_connections_per_peer=5, # More connections per peer
connection_timeout=60.0, # Longer timeout
load_balancing_strategy="least_loaded", # Use least loaded strategy
)
# Create swarm with custom connection config
swarm = new_swarm(connection_config=connection_config)
logger.info("Custom connection config applied:")
logger.info(
f" Max connections per peer: {connection_config.max_connections_per_peer}"
)
logger.info(f" Connection timeout: {connection_config.connection_timeout}s")
logger.info(
f" Load balancing strategy: {connection_config.load_balancing_strategy}"
)
await swarm.close()
logger.info("Custom connection config example completed")
async def example_multiple_connections_api() -> None:
"""Example of using the new multiple connections API."""
logger.info("Demonstrating multiple connections API...")
connection_config = ConnectionConfig(
max_connections_per_peer=3, load_balancing_strategy="round_robin"
)
swarm = new_swarm(connection_config=connection_config)
logger.info("Multiple connections API features:")
logger.info(" - dial_peer() returns list[INetConn]")
logger.info(" - get_connections(peer_id) returns list[INetConn]")
logger.info(" - get_connections_map() returns dict[ID, list[INetConn]]")
logger.info(
" - get_connection(peer_id) returns INetConn | None (backward compatibility)"
)
await swarm.close()
logger.info("Multiple connections API example completed")
async def example_backward_compatibility() -> None:
"""Example of backward compatibility features."""
logger.info("Demonstrating backward compatibility...")
swarm = new_swarm()
logger.info("Backward compatibility features:")
logger.info(" - connections_legacy property provides 1:1 mapping")
logger.info(" - get_connection() method for single connection access")
logger.info(" - Existing code continues to work")
await swarm.close()
logger.info("Backward compatibility example completed")
async def example_production_ready_config() -> None:
"""Example of production-ready configuration."""
logger.info("Creating swarm with production-ready configuration...")
# Production-ready retry configuration
retry_config = RetryConfig(
max_retries=3, # Reasonable retry limit
initial_delay=0.1, # Quick initial retry
max_delay=30.0, # Cap exponential backoff
backoff_multiplier=2.0, # Standard exponential backoff
jitter_factor=0.1, # Small jitter to prevent thundering herd
)
# Production-ready connection configuration
connection_config = ConnectionConfig(
max_connections_per_peer=3, # Balance between performance and resource usage
connection_timeout=30.0, # Reasonable timeout
load_balancing_strategy="round_robin", # Simple, predictable strategy
)
# Create swarm with production config
swarm = new_swarm(retry_config=retry_config, connection_config=connection_config)
logger.info("Production-ready configuration applied:")
logger.info(
f" Retry: {retry_config.max_retries} retries, "
f"{retry_config.max_delay}s max delay"
)
logger.info(f" Connections: {connection_config.max_connections_per_peer} per peer")
logger.info(f" Load balancing: {connection_config.load_balancing_strategy}")
await swarm.close()
logger.info("Production-ready configuration example completed")
async def main() -> None:
"""Run all examples."""
logger.info("Multiple Connections Per Peer Examples")
logger.info("=" * 50)
try:
await example_basic_multiple_connections()
logger.info("-" * 30)
await example_custom_connection_config()
logger.info("-" * 30)
await example_multiple_connections_api()
logger.info("-" * 30)
await example_backward_compatibility()
logger.info("-" * 30)
await example_production_ready_config()
logger.info("-" * 30)
logger.info("All examples completed successfully!")
except Exception as e:
logger.error(f"Example failed: {e}")
raise
if __name__ == "__main__":
trio.run(main)

50
examples/echo/echo.py
View File

@ -1,6 +1,4 @@
import argparse
import random
import secrets
import multiaddr
import trio
@ -14,71 +12,49 @@ from libp2p.crypto.secp256k1 import (
from libp2p.custom_types import (
TProtocol,
)
from libp2p.network.stream.exceptions import (
StreamEOF,
)
from libp2p.network.stream.net_stream import (
INetStream,
)
from libp2p.peer.peerinfo import (
info_from_p2p_addr,
)
from libp2p.utils.address_validation import (
find_free_port,
get_available_interfaces,
)
PROTOCOL_ID = TProtocol("/echo/1.0.0")
MAX_READ_LEN = 2**32 - 1
async def _echo_stream_handler(stream: INetStream) -> None:
try:
peer_id = stream.muxed_conn.peer_id
print(f"Received connection from {peer_id}")
# Wait until EOF
msg = await stream.read(MAX_READ_LEN)
print(f"Echoing message: {msg.decode('utf-8')}")
await stream.write(msg)
except StreamEOF:
print("Stream closed by remote peer.")
except Exception as e:
print(f"Error in echo handler: {e}")
finally:
await stream.close()
# Wait until EOF
msg = await stream.read(MAX_READ_LEN)
await stream.write(msg)
await stream.close()
async def run(port: int, destination: str, seed: int | None = None) -> None:
if port <= 0:
port = find_free_port()
listen_addr = get_available_interfaces(port)
listen_addr = multiaddr.Multiaddr(f"/ip4/0.0.0.0/tcp/{port}")
if seed:
import random
random.seed(seed)
secret_number = random.getrandbits(32 * 8)
secret = secret_number.to_bytes(length=32, byteorder="big")
else:
import secrets
secret = secrets.token_bytes(32)
host = new_host(key_pair=create_new_key_pair(secret))
async with host.run(listen_addrs=listen_addr), trio.open_nursery() as nursery:
# Start the peer-store cleanup task
nursery.start_soon(host.get_peerstore().start_cleanup_task, 60)
async with host.run(listen_addrs=[listen_addr]):
print(f"I am {host.get_id().to_string()}")
if not destination: # its the server
host.set_stream_handler(PROTOCOL_ID, _echo_stream_handler)
# Print all listen addresses with peer ID (JS parity)
print("Listener ready, listening on:\n")
peer_id = host.get_id().to_string()
for addr in listen_addr:
print(f"{addr}/p2p/{peer_id}")
print(
"\nRun this from the same folder in another console:\n\n"
f"echo-demo -d {host.get_addrs()[0]}\n"
"Run this from the same folder in another console:\n\n"
f"echo-demo "
f"-d {host.get_addrs()[0]}\n"
)
print("Waiting for incoming connections...")
await trio.sleep_forever()

191
examples/identify/identify.py
View File

@ -1,7 +1,6 @@
import argparse
import base64
import logging
import sys
import multiaddr
import trio
@ -9,13 +8,10 @@ import trio
from libp2p import (
new_host,
)
from libp2p.identity.identify.identify import (
ID as IDENTIFY_PROTOCOL_ID,
identify_handler_for,
parse_identify_response,
from libp2p.identity.identify.identify import ID as IDENTIFY_PROTOCOL_ID
from libp2p.identity.identify.pb.identify_pb2 import (
Identify,
)
from libp2p.identity.identify.pb.identify_pb2 import Identify
from libp2p.peer.envelope import debug_dump_envelope, unmarshal_envelope
from libp2p.peer.peerinfo import (
info_from_p2p_addr,
)
@ -34,11 +30,10 @@ def decode_multiaddrs(raw_addrs):
return decoded_addrs
def print_identify_response(identify_response: Identify):
def print_identify_response(identify_response):
"""Pretty-print Identify response."""
public_key_b64 = base64.b64encode(identify_response.public_key).decode("utf-8")
listen_addrs = decode_multiaddrs(identify_response.listen_addrs)
signed_peer_record = unmarshal_envelope(identify_response.signedPeerRecord)
try:
observed_addr_decoded = decode_multiaddrs([identify_response.observed_addr])
except Exception:
@ -54,10 +49,8 @@ def print_identify_response(identify_response: Identify):
f" Agent Version: {identify_response.agent_version}"
)
debug_dump_envelope(signed_peer_record)
async def run(port: int, destination: str, use_varint_format: bool = True) -> None:
async def run(port: int, destination: str) -> None:
localhost_ip = "0.0.0.0"
if not destination:
@ -65,159 +58,39 @@ async def run(port: int, destination: str, use_varint_format: bool = True) -> No
listen_addr = multiaddr.Multiaddr(f"/ip4/{localhost_ip}/tcp/{port}")
host_a = new_host()
# Set up identify handler with specified format
# Set use_varint_format = False, if want to checkout the Signed-PeerRecord
identify_handler = identify_handler_for(
host_a, use_varint_format=use_varint_format
)
host_a.set_stream_handler(IDENTIFY_PROTOCOL_ID, identify_handler)
async with (
host_a.run(listen_addrs=[listen_addr]),
trio.open_nursery() as nursery,
):
# Start the peer-store cleanup task
nursery.start_soon(host_a.get_peerstore().start_cleanup_task, 60)
# Get the actual address and replace 0.0.0.0 with 127.0.0.1 for client
# connections
server_addr = str(host_a.get_addrs()[0])
client_addr = server_addr.replace("/ip4/0.0.0.0/", "/ip4/127.0.0.1/")
format_name = "length-prefixed" if use_varint_format else "raw protobuf"
format_flag = "--raw-format" if not use_varint_format else ""
async with host_a.run(listen_addrs=[listen_addr]):
print(
f"First host listening (using {format_name} format). "
f"Run this from another console:\n\n"
f"identify-demo {format_flag} -d {client_addr}\n"
"First host listening. Run this from another console:\n\n"
f"identify-demo "
f"-d {host_a.get_addrs()[0]}\n"
)
print("Waiting for incoming identify request...")
# Add a custom handler to show connection events
async def custom_identify_handler(stream):
peer_id = stream.muxed_conn.peer_id
print(f"\n🔗 Received identify request from peer: {peer_id}")
# Show remote address in multiaddr format
try:
from libp2p.identity.identify.identify import (
_remote_address_to_multiaddr,
)
remote_address = stream.get_remote_address()
if remote_address:
observed_multiaddr = _remote_address_to_multiaddr(
remote_address
)
# Add the peer ID to create a complete multiaddr
complete_multiaddr = f"{observed_multiaddr}/p2p/{peer_id}"
print(f" Remote address: {complete_multiaddr}")
else:
print(f" Remote address: {remote_address}")
except Exception:
print(f" Remote address: {stream.get_remote_address()}")
# Call the original handler
await identify_handler(stream)
print(f"✅ Successfully processed identify request from {peer_id}")
# Replace the handler with our custom one
host_a.set_stream_handler(IDENTIFY_PROTOCOL_ID, custom_identify_handler)
try:
await trio.sleep_forever()
except KeyboardInterrupt:
print("\n🛑 Shutting down listener...")
logger.info("Listener interrupted by user")
return
await trio.sleep_forever()
else:
# Create second host (dialer)
listen_addr = multiaddr.Multiaddr(f"/ip4/{localhost_ip}/tcp/{port}")
host_b = new_host()
async with (
host_b.run(listen_addrs=[listen_addr]),
trio.open_nursery() as nursery,
):
# Start the peer-store cleanup task
nursery.start_soon(host_b.get_peerstore().start_cleanup_task, 60)
async with host_b.run(listen_addrs=[listen_addr]):
# Connect to the first host
print(f"dialer (host_b) listening on {host_b.get_addrs()[0]}")
maddr = multiaddr.Multiaddr(destination)
info = info_from_p2p_addr(maddr)
print(f"Second host connecting to peer: {info.peer_id}")
try:
await host_b.connect(info)
except Exception as e:
error_msg = str(e)
if "unable to connect" in error_msg or "SwarmException" in error_msg:
print(f"\n❌ Cannot connect to peer: {info.peer_id}")
print(f" Address: {destination}")
print(f" Error: {error_msg}")
print(
"\n💡 Make sure the peer is running and the address is correct."
)
return
else:
# Re-raise other exceptions
raise
await host_b.connect(info)
stream = await host_b.new_stream(info.peer_id, (IDENTIFY_PROTOCOL_ID,))
try:
print("Starting identify protocol...")
# Read the response using the utility function
from libp2p.utils.varint import read_length_prefixed_protobuf
response = await read_length_prefixed_protobuf(
stream, use_varint_format
)
full_response = response
response = await stream.read()
await stream.close()
# Parse the response using the robust protocol-level function
# This handles both old and new formats automatically
identify_msg = parse_identify_response(full_response)
identify_msg = Identify()
identify_msg.ParseFromString(response)
print_identify_response(identify_msg)
except Exception as e:
error_msg = str(e)
print(f"Identify protocol error: {error_msg}")
# Check for specific format mismatch errors
if "Error parsing message" in error_msg or "DecodeError" in error_msg:
print("\n" + "=" * 60)
print("FORMAT MISMATCH DETECTED!")
print("=" * 60)
if use_varint_format:
print(
"You are using length-prefixed format (default) but the "
"listener"
)
print("is using raw protobuf format.")
print(
"\nTo fix this, run the dialer with the --raw-format flag:"
)
print(f"identify-demo --raw-format -d {destination}")
else:
print("You are using raw protobuf format but the listener")
print("is using length-prefixed format (default).")
print(
"\nTo fix this, run the dialer without the --raw-format "
"flag:"
)
print(f"identify-demo -d {destination}")
print("=" * 60)
else:
import traceback
traceback.print_exc()
print(f"Identify protocol error: {e}")
return
@ -225,12 +98,9 @@ async def run(port: int, destination: str, use_varint_format: bool = True) -> No
def main() -> None:
description = """
This program demonstrates the libp2p identify protocol.
First run 'identify-demo -p <PORT> [--raw-format]' to start a listener.
First run identify-demo -p <PORT>' to start a listener.
Then run 'identify-demo <ANOTHER_PORT> -d <DESTINATION>'
where <DESTINATION> is the multiaddress shown by the listener.
Use --raw-format to send raw protobuf messages (old format) instead of
length-prefixed protobuf messages (new format, default).
"""
example_maddr = (
@ -245,35 +115,12 @@ def main() -> None:
type=str,
help=f"destination multiaddr string, e.g. {example_maddr}",
)
parser.add_argument(
"--raw-format",
action="store_true",
help=(
"use raw protobuf format (old format) instead of "
"length-prefixed (new format)"
),
)
args = parser.parse_args()
# Determine format: use varint (length-prefixed) if --raw-format is specified,
# otherwise use raw protobuf format (old format)
use_varint_format = args.raw_format
try:
if args.destination:
# Run in dialer mode
trio.run(run, *(args.port, args.destination, use_varint_format))
else:
# Run in listener mode
trio.run(run, *(args.port, args.destination, use_varint_format))
trio.run(run, *(args.port, args.destination))
except KeyboardInterrupt:
print("\n👋 Goodbye!")
logger.info("Application interrupted by user")
except Exception as e:
print(f"\n❌ Error: {str(e)}")
logger.error("Error: %s", str(e))
sys.exit(1)
pass
if __name__ == "__main__":

264
examples/identify_push/identify_push_demo.py
View File

@ -11,26 +11,23 @@ This example shows how to:
import logging
import multiaddr
import trio
from libp2p import (
new_host,
)
from libp2p.abc import (
INetStream,
)
from libp2p.crypto.secp256k1 import (
create_new_key_pair,
)
from libp2p.custom_types import (
TProtocol,
)
from libp2p.identity.identify.pb.identify_pb2 import (
Identify,
from libp2p.identity.identify import (
identify_handler_for,
)
from libp2p.identity.identify_push import (
ID_PUSH,
identify_push_handler_for,
push_identify_to_peer,
)
from libp2p.peer.peerinfo import (
@ -41,145 +38,8 @@ from libp2p.peer.peerinfo import (
logger = logging.getLogger(__name__)
def create_custom_identify_handler(host, host_name: str):
"""Create a custom identify handler that displays received information."""
async def handle_identify(stream: INetStream) -> None:
peer_id = stream.muxed_conn.peer_id
print(f"\n🔍 {host_name} received identify request from peer: {peer_id}")
# Get the standard identify response using the existing function
from libp2p.identity.identify.identify import (
_mk_identify_protobuf,
_remote_address_to_multiaddr,
)
# Get observed address
observed_multiaddr = None
try:
remote_address = stream.get_remote_address()
if remote_address:
observed_multiaddr = _remote_address_to_multiaddr(remote_address)
except Exception:
pass
# Build the identify protobuf
identify_msg = _mk_identify_protobuf(host, observed_multiaddr)
response_data = identify_msg.SerializeToString()
print(f" 📋 {host_name} identify information:")
if identify_msg.HasField("protocol_version"):
print(f" Protocol Version: {identify_msg.protocol_version}")
if identify_msg.HasField("agent_version"):
print(f" Agent Version: {identify_msg.agent_version}")
if identify_msg.HasField("public_key"):
print(f" Public Key: {identify_msg.public_key.hex()[:16]}...")
if identify_msg.listen_addrs:
print(" Listen Addresses:")
for addr_bytes in identify_msg.listen_addrs:
addr = multiaddr.Multiaddr(addr_bytes)
print(f" - {addr}")
if identify_msg.protocols:
print(" Supported Protocols:")
for protocol in identify_msg.protocols:
print(f" - {protocol}")
# Send the response
await stream.write(response_data)
await stream.close()
return handle_identify
def create_custom_identify_push_handler(host, host_name: str):
"""Create a custom identify/push handler that displays received information."""
async def handle_identify_push(stream: INetStream) -> None:
peer_id = stream.muxed_conn.peer_id
print(f"\n📤 {host_name} received identify/push from peer: {peer_id}")
try:
# Read the identify message using the utility function
from libp2p.utils.varint import read_length_prefixed_protobuf
data = await read_length_prefixed_protobuf(stream, use_varint_format=True)
# Parse the identify message
identify_msg = Identify()
identify_msg.ParseFromString(data)
print(" 📋 Received identify information:")
if identify_msg.HasField("protocol_version"):
print(f" Protocol Version: {identify_msg.protocol_version}")
if identify_msg.HasField("agent_version"):
print(f" Agent Version: {identify_msg.agent_version}")
if identify_msg.HasField("public_key"):
print(f" Public Key: {identify_msg.public_key.hex()[:16]}...")
if identify_msg.HasField("observed_addr") and identify_msg.observed_addr:
observed_addr = multiaddr.Multiaddr(identify_msg.observed_addr)
print(f" Observed Address: {observed_addr}")
if identify_msg.listen_addrs:
print(" Listen Addresses:")
for addr_bytes in identify_msg.listen_addrs:
addr = multiaddr.Multiaddr(addr_bytes)
print(f" - {addr}")
if identify_msg.protocols:
print(" Supported Protocols:")
for protocol in identify_msg.protocols:
print(f" - {protocol}")
# Update the peerstore with the new information
from libp2p.identity.identify_push.identify_push import (
_update_peerstore_from_identify,
)
await _update_peerstore_from_identify(
host.get_peerstore(), peer_id, identify_msg
)
print(f" ✅ {host_name} updated peerstore with new information")
except Exception as e:
print(f" ❌ Error processing identify/push: {e}")
finally:
await stream.close()
return handle_identify_push
async def display_peerstore_info(host, host_name: str, peer_id, description: str):
"""Display peerstore information for a specific peer."""
peerstore = host.get_peerstore()
try:
addrs = peerstore.addrs(peer_id)
except Exception:
addrs = []
try:
protocols = peerstore.get_protocols(peer_id)
except Exception:
protocols = []
print(f"\n📚 {host_name} peerstore for {description}:")
print(f" Peer ID: {peer_id}")
if addrs:
print(" Addresses:")
for addr in addrs:
print(f" - {addr}")
else:
print(" Addresses: None")
if protocols:
print(" Protocols:")
for protocol in protocols:
print(f" - {protocol}")
else:
print(" Protocols: None")
async def main() -> None:
print("\n==== Starting Enhanced Identify-Push Example ====\n")
print("\n==== Starting Identify-Push Example ====\n")
# Create key pairs for the two hosts
key_pair_1 = create_new_key_pair()
@ -188,57 +48,45 @@ async def main() -> None:
# Create the first host
host_1 = new_host(key_pair=key_pair_1)
# Set up custom identify and identify/push handlers
host_1.set_stream_handler(
TProtocol("/ipfs/id/1.0.0"), create_custom_identify_handler(host_1, "Host 1")
)
host_1.set_stream_handler(
ID_PUSH, create_custom_identify_push_handler(host_1, "Host 1")
)
# Set up the identify and identify/push handlers
host_1.set_stream_handler(TProtocol("/ipfs/id/1.0.0"), identify_handler_for(host_1))
host_1.set_stream_handler(ID_PUSH, identify_push_handler_for(host_1))
# Create the second host
host_2 = new_host(key_pair=key_pair_2)
# Set up custom identify and identify/push handlers
host_2.set_stream_handler(
TProtocol("/ipfs/id/1.0.0"), create_custom_identify_handler(host_2, "Host 2")
)
host_2.set_stream_handler(
ID_PUSH, create_custom_identify_push_handler(host_2, "Host 2")
)
# Set up the identify and identify/push handlers
host_2.set_stream_handler(TProtocol("/ipfs/id/1.0.0"), identify_handler_for(host_2))
host_2.set_stream_handler(ID_PUSH, identify_push_handler_for(host_2))
# Start listening on random ports using the run context manager
import multiaddr
listen_addr_1 = multiaddr.Multiaddr("/ip4/127.0.0.1/tcp/0")
listen_addr_2 = multiaddr.Multiaddr("/ip4/127.0.0.1/tcp/0")
async with (
host_1.run([listen_addr_1]),
host_2.run([listen_addr_2]),
trio.open_nursery() as nursery,
):
# Start the peer-store cleanup task
nursery.start_soon(host_1.get_peerstore().start_cleanup_task, 60)
nursery.start_soon(host_2.get_peerstore().start_cleanup_task, 60)
async with host_1.run([listen_addr_1]), host_2.run([listen_addr_2]):
# Get the addresses of both hosts
addr_1 = host_1.get_addrs()[0]
logger.info(f"Host 1 listening on {addr_1}")
print(f"Host 1 listening on {addr_1}")
print(f"Peer ID: {host_1.get_id().pretty()}")
addr_2 = host_2.get_addrs()[0]
logger.info(f"Host 2 listening on {addr_2}")
print(f"Host 2 listening on {addr_2}")
print(f"Peer ID: {host_2.get_id().pretty()}")
print("🏠 Host Configuration:")
print(f" Host 1: {addr_1}")
print(f" Host 1 Peer ID: {host_1.get_id().pretty()}")
print(f" Host 2: {addr_2}")
print(f" Host 2 Peer ID: {host_2.get_id().pretty()}")
print("\n🔗 Connecting Host 2 to Host 1...")
print("\nConnecting Host 2 to Host 1...")
# Connect host_2 to host_1
peer_info = info_from_p2p_addr(addr_1)
await host_2.connect(peer_info)
print("✅ Host 2 successfully connected to Host 1")
logger.info("Host 2 connected to Host 1")
print("Host 2 successfully connected to Host 1")
# Run the identify protocol from host_2 to host_1
print("\n🔄 Running identify protocol (Host 2 → Host 1)...")
# (so Host 1 learns Host 2's address)
from libp2p.identity.identify.identify import ID as IDENTIFY_PROTOCOL_ID
stream = await host_2.new_stream(host_1.get_id(), (IDENTIFY_PROTOCOL_ID,))
@ -246,58 +94,64 @@ async def main() -> None:
await stream.close()
# Run the identify protocol from host_1 to host_2
print("\n🔄 Running identify protocol (Host 1 → Host 2)...")
# (so Host 2 learns Host 1's address)
stream = await host_1.new_stream(host_2.get_id(), (IDENTIFY_PROTOCOL_ID,))
response = await stream.read()
await stream.close()
# Update Host 1's peerstore with Host 2's addresses
# --- NEW CODE: Update Host 1's peerstore with Host 2's addresses ---
from libp2p.identity.identify.pb.identify_pb2 import (
Identify,
)
identify_msg = Identify()
identify_msg.ParseFromString(response)
peerstore_1 = host_1.get_peerstore()
peer_id_2 = host_2.get_id()
for addr_bytes in identify_msg.listen_addrs:
maddr = multiaddr.Multiaddr(addr_bytes)
peerstore_1.add_addr(peer_id_2, maddr, ttl=3600)
# TTL can be any positive int
peerstore_1.add_addr(
peer_id_2,
maddr,
ttl=3600,
)
# --- END NEW CODE ---
# Display peerstore information before push
await display_peerstore_info(
host_1, "Host 1", peer_id_2, "Host 2 (before push)"
# Now Host 1's peerstore should have Host 2's address
peerstore_1 = host_1.get_peerstore()
peer_id_2 = host_2.get_id()
addrs_1_for_2 = peerstore_1.addrs(peer_id_2)
logger.info(
f"[DEBUG] Host 1 peerstore addresses for Host 2 before push: "
f"{addrs_1_for_2}"
)
print(
f"[DEBUG] Host 1 peerstore addresses for Host 2 before push: "
f"{addrs_1_for_2}"
)
# Push identify information from host_1 to host_2
print("\n📤 Host 1 pushing identify information to Host 2...")
logger.info("Host 1 pushing identify information to Host 2")
print("\nHost 1 pushing identify information to Host 2...")
try:
# Call push_identify_to_peer which now returns a boolean
success = await push_identify_to_peer(host_1, host_2.get_id())
if success:
print("✅ Identify push completed successfully!")
logger.info("Identify push completed successfully")
print("Identify push completed successfully!")
else:
print("⚠️ Identify push didn't complete successfully")
logger.warning("Identify push didn't complete successfully")
print("\nWarning: Identify push didn't complete successfully")
except Exception as e:
print(f"❌ Error during identify push: {str(e)}")
logger.error(f"Error during identify push: {str(e)}")
print(f"\nError during identify push: {str(e)}")
# Give a moment for the identify/push processing to complete
await trio.sleep(0.5)
# Display peerstore information after push
await display_peerstore_info(host_1, "Host 1", peer_id_2, "Host 2 (after push)")
await display_peerstore_info(
host_2, "Host 2", host_1.get_id(), "Host 1 (after push)"
)
# Give more time for background tasks to finish and connections to stabilize
print("\n⏳ Waiting for background tasks to complete...")
await trio.sleep(1.0)
# Gracefully close connections to prevent connection errors
print("🔌 Closing connections...")
await host_2.disconnect(host_1.get_id())
await trio.sleep(0.2)
print("\n🎉 Example completed successfully!")
# Add this at the end of your async with block:
await trio.sleep(0.5) # Give background tasks time to finish
if __name__ == "__main__":

256
examples/identify_push/identify_push_listener_dialer.py
View File

@ -41,9 +41,6 @@ from libp2p.identity.identify import (
ID as ID_IDENTIFY,
identify_handler_for,
)
from libp2p.identity.identify.identify import (
_remote_address_to_multiaddr,
)
from libp2p.identity.identify.pb.identify_pb2 import (
Identify,
)
@ -60,46 +57,18 @@ from libp2p.peer.peerinfo import (
logger = logging.getLogger("libp2p.identity.identify-push-example")
def custom_identify_push_handler_for(host, use_varint_format: bool = True):
def custom_identify_push_handler_for(host):
"""
Create a custom handler for the identify/push protocol that logs and prints
the identity information received from the dialer.
Args:
host: The libp2p host
use_varint_format: If True, expect length-prefixed format; if False, expect
raw protobuf
"""
async def handle_identify_push(stream: INetStream) -> None:
peer_id = stream.muxed_conn.peer_id
# Get remote address information
try:
remote_address = stream.get_remote_address()
if remote_address:
observed_multiaddr = _remote_address_to_multiaddr(remote_address)
logger.info(
"Connection from remote peer %s, address: %s, multiaddr: %s",
peer_id,
remote_address,
observed_multiaddr,
)
print(f"\n🔗 Received identify/push request from peer: {peer_id}")
# Add the peer ID to create a complete multiaddr
complete_multiaddr = f"{observed_multiaddr}/p2p/{peer_id}"
print(f" Remote address: {complete_multiaddr}")
except Exception as e:
logger.error("Error getting remote address: %s", e)
print(f"\n🔗 Received identify/push request from peer: {peer_id}")
try:
# Use the utility function to read the protobuf message
from libp2p.utils.varint import read_length_prefixed_protobuf
data = await read_length_prefixed_protobuf(stream, use_varint_format)
# Read the identify message from the stream
data = await stream.read()
identify_msg = Identify()
identify_msg.ParseFromString(data)
@ -148,41 +117,11 @@ def custom_identify_push_handler_for(host, use_varint_format: bool = True):
await _update_peerstore_from_identify(peerstore, peer_id, identify_msg)
logger.info("Successfully processed identify/push from peer %s", peer_id)
print(f"✅ Successfully processed identify/push from peer {peer_id}")
print(f"\nSuccessfully processed identify/push from peer {peer_id}")
except Exception as e:
error_msg = str(e)
logger.error(
"Error processing identify/push from %s: %s", peer_id, error_msg
)
print(f"\nError processing identify/push from {peer_id}: {error_msg}")
# Check for specific format mismatch errors
if (
"Error parsing message" in error_msg
or "DecodeError" in error_msg
or "ParseFromString" in error_msg
):
print("\n" + "=" * 60)
print("FORMAT MISMATCH DETECTED!")
print("=" * 60)
if use_varint_format:
print(
"You are using length-prefixed format (default) but the "
"dialer is using raw protobuf format."
)
print("\nTo fix this, run the dialer with the --raw-format flag:")
print(
"identify-push-listener-dialer-demo --raw-format -d <ADDRESS>"
)
else:
print("You are using raw protobuf format but the dialer")
print("is using length-prefixed format (default).")
print(
"\nTo fix this, run the dialer without the --raw-format flag:"
)
print("identify-push-listener-dialer-demo -d <ADDRESS>")
print("=" * 60)
logger.error("Error processing identify/push from %s: %s", peer_id, e)
print(f"\nError processing identify/push from {peer_id}: {e}")
finally:
# Close the stream after processing
await stream.close()
@ -190,15 +129,9 @@ def custom_identify_push_handler_for(host, use_varint_format: bool = True):
return handle_identify_push
async def run_listener(
port: int, use_varint_format: bool = True, raw_format_flag: bool = False
) -> None:
async def run_listener(port: int) -> None:
"""Run a host in listener mode."""
format_name = "length-prefixed" if use_varint_format else "raw protobuf"
print(
f"\n==== Starting Identify-Push Listener on port {port} "
f"(using {format_name} format) ====\n"
)
print(f"\n==== Starting Identify-Push Listener on port {port} ====\n")
# Create key pair for the listener
key_pair = create_new_key_pair()
@ -206,58 +139,35 @@ async def run_listener(
# Create the listener host
host = new_host(key_pair=key_pair)
# Set up the identify and identify/push handlers with specified format
host.set_stream_handler(
ID_IDENTIFY, identify_handler_for(host, use_varint_format=use_varint_format)
)
host.set_stream_handler(
ID_IDENTIFY_PUSH,
custom_identify_push_handler_for(host, use_varint_format=use_varint_format),
)
# Set up the identify and identify/push handlers
host.set_stream_handler(ID_IDENTIFY, identify_handler_for(host))
host.set_stream_handler(ID_IDENTIFY_PUSH, custom_identify_push_handler_for(host))
# Start listening
listen_addr = multiaddr.Multiaddr(f"/ip4/0.0.0.0/tcp/{port}")
try:
async with host.run([listen_addr]):
addr = host.get_addrs()[0]
logger.info("Listener host ready!")
print("Listener host ready!")
async with host.run([listen_addr]):
addr = host.get_addrs()[0]
logger.info("Listener host ready!")
print("Listener host ready!")
logger.info(f"Listening on: {addr}")
print(f"Listening on: {addr}")
logger.info(f"Listening on: {addr}")
print(f"Listening on: {addr}")
logger.info(f"Peer ID: {host.get_id().pretty()}")
print(f"Peer ID: {host.get_id().pretty()}")
logger.info(f"Peer ID: {host.get_id().pretty()}")
print(f"Peer ID: {host.get_id().pretty()}")
print("\nRun dialer with command:")
if raw_format_flag:
print(f"identify-push-listener-dialer-demo -d {addr} --raw-format")
else:
print(f"identify-push-listener-dialer-demo -d {addr}")
print("\nWaiting for incoming identify/push requests... (Ctrl+C to exit)")
print("\nRun dialer with command:")
print(f"identify-push-listener-dialer-demo -d {addr}")
print("\nWaiting for incoming connections... (Ctrl+C to exit)")
# Keep running until interrupted
try:
await trio.sleep_forever()
except KeyboardInterrupt:
print("\n🛑 Shutting down listener...")
logger.info("Listener interrupted by user")
return
except Exception as e:
logger.error(f"Listener error: {e}")
raise
# Keep running until interrupted
await trio.sleep_forever()
async def run_dialer(
port: int, destination: str, use_varint_format: bool = True
) -> None:
async def run_dialer(port: int, destination: str) -> None:
"""Run a host in dialer mode that connects to a listener."""
format_name = "length-prefixed" if use_varint_format else "raw protobuf"
print(
f"\n==== Starting Identify-Push Dialer on port {port} "
f"(using {format_name} format) ====\n"
)
print(f"\n==== Starting Identify-Push Dialer on port {port} ====\n")
# Create key pair for the dialer
key_pair = create_new_key_pair()
@ -265,14 +175,9 @@ async def run_dialer(
# Create the dialer host
host = new_host(key_pair=key_pair)
# Set up the identify and identify/push handlers with specified format
host.set_stream_handler(
ID_IDENTIFY, identify_handler_for(host, use_varint_format=use_varint_format)
)
host.set_stream_handler(
ID_IDENTIFY_PUSH,
identify_push_handler_for(host, use_varint_format=use_varint_format),
)
# Set up the identify and identify/push handlers
host.set_stream_handler(ID_IDENTIFY, identify_handler_for(host))
host.set_stream_handler(ID_IDENTIFY_PUSH, identify_push_handler_for(host))
# Start listening on a different port
listen_addr = multiaddr.Multiaddr(f"/ip4/0.0.0.0/tcp/{port}")
@ -293,9 +198,7 @@ async def run_dialer(
try:
await host.connect(peer_info)
logger.info("Successfully connected to listener!")
print("✅ Successfully connected to listener!")
print(f" Connected to: {peer_info.peer_id}")
print(f" Full address: {destination}")
print("Successfully connected to listener!")
# Push identify information to the listener
logger.info("Pushing identify information to listener...")
@ -303,13 +206,11 @@ async def run_dialer(
try:
# Call push_identify_to_peer which returns a boolean
success = await push_identify_to_peer(
host, peer_info.peer_id, use_varint_format=use_varint_format
)
success = await push_identify_to_peer(host, peer_info.peer_id)
if success:
logger.info("Identify push completed successfully!")
print("✅ Identify push completed successfully!")
print("Identify push completed successfully!")
logger.info("Example completed successfully!")
print("\nExample completed successfully!")
@ -320,57 +221,17 @@ async def run_dialer(
logger.warning("Example completed with warnings.")
print("Example completed with warnings.")
except Exception as e:
error_msg = str(e)
logger.error(f"Error during identify push: {error_msg}")
print(f"\nError during identify push: {error_msg}")
# Check for specific format mismatch errors
if (
"Error parsing message" in error_msg
or "DecodeError" in error_msg
or "ParseFromString" in error_msg
):
print("\n" + "=" * 60)
print("FORMAT MISMATCH DETECTED!")
print("=" * 60)
if use_varint_format:
print(
"You are using length-prefixed format (default) but the "
"listener is using raw protobuf format."
)
print(
"\nTo fix this, run the dialer with the --raw-format flag:"
)
print(
f"identify-push-listener-dialer-demo --raw-format -d "
f"{destination}"
)
else:
print("You are using raw protobuf format but the listener")
print("is using length-prefixed format (default).")
print(
"\nTo fix this, run the dialer without the --raw-format "
"flag:"
)
print(f"identify-push-listener-dialer-demo -d {destination}")
print("=" * 60)
logger.error(f"Error during identify push: {str(e)}")
print(f"\nError during identify push: {str(e)}")
logger.error("Example completed with errors.")
print("Example completed with errors.")
# Continue execution despite the push error
except Exception as e:
error_msg = str(e)
if "unable to connect" in error_msg or "SwarmException" in error_msg:
print(f"\n❌ Cannot connect to peer: {peer_info.peer_id}")
print(f" Address: {destination}")
print(f" Error: {error_msg}")
print("\n💡 Make sure the peer is running and the address is correct.")
return
else:
logger.error(f"Error during dialer operation: {error_msg}")
print(f"\nError during dialer operation: {error_msg}")
raise
logger.error(f"Error during dialer operation: {str(e)}")
print(f"\nError during dialer operation: {str(e)}")
raise
def main() -> None:
@ -379,55 +240,34 @@ def main() -> None:
This program demonstrates the libp2p identify/push protocol.
Without arguments, it runs as a listener on random port.
With -d parameter, it runs as a dialer on random port.
Port 0 (default) means the OS will automatically assign an available port.
This prevents port conflicts when running multiple instances.
Use --raw-format to send raw protobuf messages (old format) instead of
length-prefixed protobuf messages (new format, default).
"""
parser = argparse.ArgumentParser(description=description)
parser.add_argument(
"-p",
"--port",
default=0,
type=int,
help="source port number (0 = random available port)",
example = (
"/ip4/127.0.0.1/tcp/8000/p2p/QmQn4SwGkDZKkUEpBRBvTmheQycxAHJUNmVEnjA2v1qe8Q"
)
parser = argparse.ArgumentParser(description=description)
parser.add_argument("-p", "--port", default=0, type=int, help="source port number")
parser.add_argument(
"-d",
"--destination",
type=str,
help="destination multiaddr string",
help=f"destination multiaddr string, e.g. {example}",
)
parser.add_argument(
"--raw-format",
action="store_true",
help=(
"use raw protobuf format (old format) instead of "
"length-prefixed (new format)"
),
)
args = parser.parse_args()
# Determine format: raw format if --raw-format is specified, otherwise
# length-prefixed
use_varint_format = not args.raw_format
try:
if args.destination:
# Run in dialer mode with random available port if not specified
trio.run(run_dialer, args.port, args.destination, use_varint_format)
trio.run(run_dialer, args.port, args.destination)
else:
# Run in listener mode with random available port if not specified
trio.run(run_listener, args.port, use_varint_format, args.raw_format)
trio.run(run_listener, args.port)
except KeyboardInterrupt:
print("\n👋 Goodbye!")
logger.info("Application interrupted by user")
print("\nInterrupted by user")
logger.info("Interrupted by user")
except Exception as e:
print(f"\n❌ Error: {str(e)}")
print(f"\nError: {str(e)}")
logger.error("Error: %s", str(e))
sys.exit(1)

304
examples/kademlia/kademlia.py
View File

@ -1,304 +0,0 @@
#!/usr/bin/env python
"""
A basic example of using the Kademlia DHT implementation, with all setup logic inlined.
This example demonstrates both value storage/retrieval and content server
advertisement/discovery.
"""
import argparse
import logging
import os
import random
import secrets
import sys
import base58
from multiaddr import (
Multiaddr,
)
import trio
from libp2p import (
new_host,
)
from libp2p.abc import (
IHost,
)
from libp2p.crypto.secp256k1 import (
create_new_key_pair,
)
from libp2p.kad_dht.kad_dht import (
DHTMode,
KadDHT,
)
from libp2p.kad_dht.utils import (
create_key_from_binary,
)
from libp2p.tools.async_service import (
background_trio_service,
)
from libp2p.tools.utils import (
info_from_p2p_addr,
)
from libp2p.utils.paths import get_script_dir, join_paths
# Configure logging
logging.basicConfig(
level=logging.INFO,
format="%(asctime)s - %(name)s - %(levelname)s - %(message)s",
handlers=[logging.StreamHandler()],
)
logger = logging.getLogger("kademlia-example")
# Configure DHT module loggers to inherit from the parent logger
# This ensures all kademlia-example.* loggers use the same configuration
# Get the directory where this script is located
SCRIPT_DIR = get_script_dir(__file__)
SERVER_ADDR_LOG = join_paths(SCRIPT_DIR, "server_node_addr.txt")
# Set the level for all child loggers
for module in [
"kad_dht",
"value_store",
"peer_routing",
"routing_table",
"provider_store",
]:
child_logger = logging.getLogger(f"kademlia-example.{module}")
child_logger.setLevel(logging.INFO)
child_logger.propagate = True # Allow propagation to parent
# File to store node information
bootstrap_nodes = []
# function to take bootstrap_nodes as input and connects to them
async def connect_to_bootstrap_nodes(host: IHost, bootstrap_addrs: list[str]) -> None:
"""
Connect to the bootstrap nodes provided in the list.
params: host: The host instance to connect to
bootstrap_addrs: List of bootstrap node addresses
Returns
-------
None
"""
for addr in bootstrap_addrs:
try:
peerInfo = info_from_p2p_addr(Multiaddr(addr))
host.get_peerstore().add_addrs(peerInfo.peer_id, peerInfo.addrs, 3600)
await host.connect(peerInfo)
except Exception as e:
logger.error(f"Failed to connect to bootstrap node {addr}: {e}")
def save_server_addr(addr: str) -> None:
"""Append the server's multiaddress to the log file."""
try:
with open(SERVER_ADDR_LOG, "w") as f:
f.write(addr + "\n")
logger.info(f"Saved server address to log: {addr}")
except Exception as e:
logger.error(f"Failed to save server address: {e}")
def load_server_addrs() -> list[str]:
"""Load all server multiaddresses from the log file."""
if not os.path.exists(SERVER_ADDR_LOG):
return []
try:
with open(SERVER_ADDR_LOG) as f:
return [line.strip() for line in f if line.strip()]
except Exception as e:
logger.error(f"Failed to load server addresses: {e}")
return []
async def run_node(
port: int, mode: str, bootstrap_addrs: list[str] | None = None
) -> None:
"""Run a node that serves content in the DHT with setup inlined."""
try:
if port <= 0:
port = random.randint(10000, 60000)
logger.debug(f"Using port: {port}")
# Convert string mode to DHTMode enum
if mode is None or mode.upper() == "CLIENT":
dht_mode = DHTMode.CLIENT
elif mode.upper() == "SERVER":
dht_mode = DHTMode.SERVER
else:
logger.error(f"Invalid mode: {mode}. Must be 'client' or 'server'")
sys.exit(1)
# Load server addresses for client mode
if dht_mode == DHTMode.CLIENT:
server_addrs = load_server_addrs()
if server_addrs:
logger.info(f"Loaded {len(server_addrs)} server addresses from log")
bootstrap_nodes.append(server_addrs[0]) # Use the first server address
else:
logger.warning("No server addresses found in log file")
if bootstrap_addrs:
for addr in bootstrap_addrs:
bootstrap_nodes.append(addr)
key_pair = create_new_key_pair(secrets.token_bytes(32))
host = new_host(key_pair=key_pair)
listen_addr = Multiaddr(f"/ip4/127.0.0.1/tcp/{port}")
async with host.run(listen_addrs=[listen_addr]), trio.open_nursery() as nursery:
# Start the peer-store cleanup task
nursery.start_soon(host.get_peerstore().start_cleanup_task, 60)
peer_id = host.get_id().pretty()
addr_str = f"/ip4/127.0.0.1/tcp/{port}/p2p/{peer_id}"
await connect_to_bootstrap_nodes(host, bootstrap_nodes)
dht = KadDHT(host, dht_mode)
# take all peer ids from the host and add them to the dht
for peer_id in host.get_peerstore().peer_ids():
await dht.routing_table.add_peer(peer_id)
logger.info(f"Connected to bootstrap nodes: {host.get_connected_peers()}")
bootstrap_cmd = f"--bootstrap {addr_str}"
logger.info("To connect to this node, use: %s", bootstrap_cmd)
# Save server address in server mode
if dht_mode == DHTMode.SERVER:
save_server_addr(addr_str)
# Start the DHT service
async with background_trio_service(dht):
logger.info(f"DHT service started in {dht_mode.value} mode")
val_key = create_key_from_binary(b"py-libp2p kademlia example value")
content = b"Hello from python node "
content_key = create_key_from_binary(content)
if dht_mode == DHTMode.SERVER:
# Store a value in the DHT
msg = "Hello message from Sumanjeet"
val_data = msg.encode()
await dht.put_value(val_key, val_data)
logger.info(
f"Stored value '{val_data.decode()}'"
f"with key: {base58.b58encode(val_key).decode()}"
)
# Advertise as content server
success = await dht.provider_store.provide(content_key)
if success:
logger.info(
"Successfully advertised as server"
f"for content: {content_key.hex()}"
)
else:
logger.warning("Failed to advertise as content server")
else:
# retrieve the value
logger.info(
"Looking up key: %s", base58.b58encode(val_key).decode()
)
val_data = await dht.get_value(val_key)
if val_data:
try:
logger.info(f"Retrieved value: {val_data.decode()}")
except UnicodeDecodeError:
logger.info(f"Retrieved value (bytes): {val_data!r}")
else:
logger.warning("Failed to retrieve value")
# Also check if we can find servers for our own content
logger.info("Looking for servers of content: %s", content_key.hex())
providers = await dht.provider_store.find_providers(content_key)
if providers:
logger.info(
"Found %d servers for content: %s",
len(providers),
[p.peer_id.pretty() for p in providers],
)
else:
logger.warning(
"No servers found for content %s", content_key.hex()
)
# Keep the node running
while True:
logger.info(
"Status - Connected peers: %d,"
"Peers in store: %d, Values in store: %d",
len(dht.host.get_connected_peers()),
len(dht.host.get_peerstore().peer_ids()),
len(dht.value_store.store),
)
await trio.sleep(10)
except Exception as e:
logger.error(f"Server node error: {e}", exc_info=True)
sys.exit(1)
def parse_args():
"""Parse command line arguments."""
parser = argparse.ArgumentParser(
description="Kademlia DHT example with content server functionality"
)
parser.add_argument(
"--mode",
default="server",
help="Run as a server or client node",
)
parser.add_argument(
"--port",
type=int,
default=0,
help="Port to listen on (0 for random)",
)
parser.add_argument(
"--bootstrap",
type=str,
nargs="*",
help=(
"Multiaddrs of bootstrap nodes. "
"Provide a space-separated list of addresses. "
"This is required for client mode."
),
)
# add option to use verbose logging
parser.add_argument(
"--verbose",
action="store_true",
help="Enable verbose logging",
)
args = parser.parse_args()
# Set logging level based on verbosity
if args.verbose:
logging.getLogger().setLevel(logging.DEBUG)
else:
logging.getLogger().setLevel(logging.INFO)
return args
def main():
"""Main entry point for the kademlia demo."""
try:
args = parse_args()
logger.info(
"Running in %s mode on port %d",
args.mode,
args.port,
)
trio.run(run_node, args.port, args.mode, args.bootstrap)
except Exception as e:
logger.critical(f"Script failed: {e}", exc_info=True)
sys.exit(1)
if __name__ == "__main__":
main()

77
examples/mDNS/mDNS.py
View File

@ -1,77 +0,0 @@
import argparse
import logging
import secrets
import multiaddr
import trio
from libp2p import (
new_host,
)
from libp2p.abc import PeerInfo
from libp2p.crypto.secp256k1 import (
create_new_key_pair,
)
from libp2p.discovery.events.peerDiscovery import peerDiscovery
logger = logging.getLogger("libp2p.discovery.mdns")
logger.setLevel(logging.INFO)
handler = logging.StreamHandler()
handler.setFormatter(
logging.Formatter("%(asctime)s - %(name)s - %(levelname)s - %(message)s")
)
logger.addHandler(handler)
# Set root logger to DEBUG to capture all logs from dependencies
logging.getLogger().setLevel(logging.DEBUG)
def onPeerDiscovery(peerinfo: PeerInfo):
logger.info(f"Discovered: {peerinfo.peer_id}")
async def run(port: int) -> None:
secret = secrets.token_bytes(32)
key_pair = create_new_key_pair(secret)
listen_addr = multiaddr.Multiaddr(f"/ip4/0.0.0.0/tcp/{port}")
peerDiscovery.register_peer_discovered_handler(onPeerDiscovery)
print(
"Run this from the same folder in another console to "
"start another peer on a different port:\n\n"
"mdns-demo -p <ANOTHER_PORT>\n"
)
print("Waiting for mDNS peer discovery events...\n")
logger.info("Starting peer Discovery")
host = new_host(key_pair=key_pair, enable_mDNS=True)
async with host.run(listen_addrs=[listen_addr]), trio.open_nursery() as nursery:
# Start the peer-store cleanup task
nursery.start_soon(host.get_peerstore().start_cleanup_task, 60)
await trio.sleep_forever()
def main() -> None:
description = """
This program demonstrates mDNS peer discovery using libp2p.
To use it, run 'mdns-demo -p <PORT>', where <PORT> is the port number.
Start multiple peers on different ports to see discovery in action.
"""
parser = argparse.ArgumentParser(description=description)
parser.add_argument("-p", "--port", default=0, type=int, help="source port number")
parser.add_argument(
"-v", "--verbose", action="store_true", help="Enable verbose output"
)
args = parser.parse_args()
if args.verbose:
logger.setLevel(logging.DEBUG)
try:
trio.run(run, args.port)
except KeyboardInterrupt:
logger.info("Exiting...")
if __name__ == "__main__":
main()

3
examples/ping/ping.py
View File

@ -59,9 +59,6 @@ async def run(port: int, destination: str) -> None:
host = new_host(listen_addrs=[listen_addr])
async with host.run(listen_addrs=[listen_addr]), trio.open_nursery() as nursery:
# Start the peer-store cleanup task
nursery.start_soon(host.get_peerstore().start_cleanup_task, 60)
if not destination:
host.set_stream_handler(PING_PROTOCOL_ID, handle_ping)

14
examples/pubsub/pubsub.py
View File

@ -1,5 +1,6 @@
import argparse
import logging
import socket
import base58
import multiaddr
@ -30,9 +31,6 @@ from libp2p.stream_muxer.mplex.mplex import (
from libp2p.tools.async_service.trio_service import (
background_trio_service,
)
from libp2p.utils.address_validation import (
find_free_port,
)
# Configure logging
logging.basicConfig(
@ -79,6 +77,13 @@ async def publish_loop(pubsub, topic, termination_event):
await trio.sleep(1) # Avoid tight loop on error
def find_free_port():
"""Find a free port on localhost."""
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
s.bind(("", 0)) # Bind to a free port provided by the OS
return s.getsockname()[1]
async def monitor_peer_topics(pubsub, nursery, termination_event):
"""
Monitor for new topics that peers are subscribed to and
@ -139,9 +144,6 @@ async def run(topic: str, destination: str | None, port: int | None) -> None:
pubsub = Pubsub(host, gossipsub)
termination_event = trio.Event() # Event to signal termination
async with host.run(listen_addrs=[listen_addr]), trio.open_nursery() as nursery:
# Start the peer-store cleanup task
nursery.start_soon(host.get_peerstore().start_cleanup_task, 60)
logger.info(f"Node started with peer ID: {host.get_id()}")
logger.info(f"Listening on: {listen_addr}")
logger.info("Initializing PubSub and GossipSub...")

221
examples/random_walk/random_walk.py
View File

@ -1,221 +0,0 @@
"""
Random Walk Example for py-libp2p Kademlia DHT
This example demonstrates the Random Walk module's peer discovery capabilities
using real libp2p hosts and Kademlia DHT. It shows how the Random Walk module
automatically discovers new peers and maintains routing table health.
Usage:
# Start server nodes (they will discover peers via random walk)
python3 random_walk.py --mode server
"""
import argparse
import logging
import random
import secrets
import sys
from multiaddr import Multiaddr
import trio
from libp2p import new_host
from libp2p.abc import IHost
from libp2p.crypto.secp256k1 import create_new_key_pair
from libp2p.kad_dht.kad_dht import DHTMode, KadDHT
from libp2p.tools.async_service import background_trio_service
# Simple logging configuration
def setup_logging(verbose: bool = False):
"""Setup unified logging configuration."""
level = logging.DEBUG if verbose else logging.INFO
logging.basicConfig(
level=level,
format="%(asctime)s - %(name)s - %(levelname)s - %(message)s",
handlers=[logging.StreamHandler()],
)
# Configure key module loggers
for module in ["libp2p.discovery.random_walk", "libp2p.kad_dht"]:
logging.getLogger(module).setLevel(level)
# Suppress noisy logs
logging.getLogger("multiaddr").setLevel(logging.WARNING)
logger = logging.getLogger("random-walk-example")
# Default bootstrap nodes
DEFAULT_BOOTSTRAP_NODES = [
"/ip4/104.131.131.82/tcp/4001/p2p/QmaCpDMGvV2BGHeYERUEnRQAwe3N8SzbUtfsmvsqQLuvuJ"
]
def filter_compatible_peer_info(peer_info) -> bool:
"""Filter peer info to check if it has compatible addresses (TCP + IPv4)."""
if not hasattr(peer_info, "addrs") or not peer_info.addrs:
return False
for addr in peer_info.addrs:
addr_str = str(addr)
if "/tcp/" in addr_str and "/ip4/" in addr_str and "/quic" not in addr_str:
return True
return False
async def maintain_connections(host: IHost) -> None:
"""Maintain connections to ensure the host remains connected to healthy peers."""
while True:
try:
connected_peers = host.get_connected_peers()
list_peers = host.get_peerstore().peers_with_addrs()
if len(connected_peers) < 20:
logger.debug("Reconnecting to maintain peer connections...")
# Find compatible peers
compatible_peers = []
for peer_id in list_peers:
try:
peer_info = host.get_peerstore().peer_info(peer_id)
if filter_compatible_peer_info(peer_info):
compatible_peers.append(peer_id)
except Exception:
continue
# Connect to random subset of compatible peers
if compatible_peers:
random_peers = random.sample(
compatible_peers, min(50, len(compatible_peers))
)
for peer_id in random_peers:
if peer_id not in connected_peers:
try:
with trio.move_on_after(5):
peer_info = host.get_peerstore().peer_info(peer_id)
await host.connect(peer_info)
logger.debug(f"Connected to peer: {peer_id}")
except Exception as e:
logger.debug(f"Failed to connect to {peer_id}: {e}")
await trio.sleep(15)
except Exception as e:
logger.error(f"Error maintaining connections: {e}")
async def demonstrate_random_walk_discovery(dht: KadDHT, interval: int = 30) -> None:
"""Demonstrate Random Walk peer discovery with periodic statistics."""
iteration = 0
while True:
iteration += 1
logger.info(f"--- Iteration {iteration} ---")
logger.info(f"Routing table size: {dht.get_routing_table_size()}")
logger.info(f"Connected peers: {len(dht.host.get_connected_peers())}")
logger.info(f"Peerstore size: {len(dht.host.get_peerstore().peer_ids())}")
await trio.sleep(interval)
async def run_node(port: int, mode: str, demo_interval: int = 30) -> None:
"""Run a node that demonstrates Random Walk peer discovery."""
try:
if port <= 0:
port = random.randint(10000, 60000)
logger.info(f"Starting {mode} node on port {port}")
# Determine DHT mode
dht_mode = DHTMode.SERVER if mode == "server" else DHTMode.CLIENT
# Create host and DHT
key_pair = create_new_key_pair(secrets.token_bytes(32))
host = new_host(key_pair=key_pair, bootstrap=DEFAULT_BOOTSTRAP_NODES)
listen_addr = Multiaddr(f"/ip4/0.0.0.0/tcp/{port}")
async with host.run(listen_addrs=[listen_addr]), trio.open_nursery() as nursery:
# Start maintenance tasks
nursery.start_soon(host.get_peerstore().start_cleanup_task, 60)
nursery.start_soon(maintain_connections, host)
peer_id = host.get_id().pretty()
logger.info(f"Node peer ID: {peer_id}")
logger.info(f"Node address: /ip4/0.0.0.0/tcp/{port}/p2p/{peer_id}")
# Create and start DHT with Random Walk enabled
dht = KadDHT(host, dht_mode, enable_random_walk=True)
logger.info(f"Initial routing table size: {dht.get_routing_table_size()}")
async with background_trio_service(dht):
logger.info(f"DHT service started in {dht_mode.value} mode")
logger.info(f"Random Walk enabled: {dht.is_random_walk_enabled()}")
async with trio.open_nursery() as task_nursery:
# Start demonstration and status reporting
task_nursery.start_soon(
demonstrate_random_walk_discovery, dht, demo_interval
)
# Periodic status updates
async def status_reporter():
while True:
await trio.sleep(30)
logger.debug(
f"Connected: {len(dht.host.get_connected_peers())}, "
f"Routing table: {dht.get_routing_table_size()}, "
f"Peerstore: {len(dht.host.get_peerstore().peer_ids())}"
)
task_nursery.start_soon(status_reporter)
await trio.sleep_forever()
except Exception as e:
logger.error(f"Node error: {e}", exc_info=True)
sys.exit(1)
def parse_args():
"""Parse command line arguments."""
parser = argparse.ArgumentParser(
description="Random Walk Example for py-libp2p Kademlia DHT",
)
parser.add_argument(
"--mode",
choices=["server", "client"],
default="server",
help="Node mode: server (DHT server), or client (DHT client)",
)
parser.add_argument(
"--port", type=int, default=0, help="Port to listen on (0 for random)"
)
parser.add_argument(
"--demo-interval",
type=int,
default=30,
help="Interval between random walk demonstrations in seconds",
)
parser.add_argument("--verbose", action="store_true", help="Enable verbose logging")
return parser.parse_args()
def main():
"""Main entry point for the random walk example."""
try:
args = parse_args()
setup_logging(args.verbose)
logger.info("=== Random Walk Example for py-libp2p ===")
logger.info(
f"Mode: {args.mode}, Port: {args.port} Demo interval: {args.demo_interval}s"
)
trio.run(run_node, args.port, args.mode, args.demo_interval)
except KeyboardInterrupt:
logger.info("Received interrupt signal, shutting down...")
except Exception as e:
logger.critical(f"Example failed: {e}", exc_info=True)
sys.exit(1)
if __name__ == "__main__":
main()

47
libp2p/__init__.py
View File

@ -1,5 +1,3 @@
"""Libp2p Python implementation."""
from collections.abc import (
Mapping,
Sequence,
@ -8,12 +6,15 @@ from importlib.metadata import version as __version
from typing import (
Literal,
Optional,
Type,
cast,
)
import multiaddr
from libp2p.abc import (
IHost,
IMuxedConn,
INetworkService,
IPeerRouting,
IPeerStore,
@ -38,8 +39,6 @@ from libp2p.host.routed_host import (
RoutedHost,
)
from libp2p.network.swarm import (
ConnectionConfig,
RetryConfig,
Swarm,
)
from libp2p.peer.id import (
@ -47,25 +46,22 @@ from libp2p.peer.id import (
)
from libp2p.peer.peerstore import (
PeerStore,
create_signed_peer_record,
)
from libp2p.security.insecure.transport import (
PLAINTEXT_PROTOCOL_ID,
InsecureTransport,
)
from libp2p.security.noise.transport import (
PROTOCOL_ID as NOISE_PROTOCOL_ID,
Transport as NoiseTransport,
)
from libp2p.security.noise.transport import PROTOCOL_ID as NOISE_PROTOCOL_ID
from libp2p.security.noise.transport import Transport as NoiseTransport
import libp2p.security.secio.transport as secio
from libp2p.stream_muxer.mplex.mplex import (
MPLEX_PROTOCOL_ID,
Mplex,
)
from libp2p.stream_muxer.yamux.yamux import (
PROTOCOL_ID as YAMUX_PROTOCOL_ID,
Yamux,
)
from libp2p.stream_muxer.yamux.yamux import PROTOCOL_ID as YAMUX_PROTOCOL_ID
from libp2p.transport.tcp.tcp import (
TCP,
)
@ -85,7 +81,6 @@ DEFAULT_MUXER = "YAMUX"
# Multiplexer options
MUXER_YAMUX = "YAMUX"
MUXER_MPLEX = "MPLEX"
DEFAULT_NEGOTIATE_TIMEOUT = 5
def set_default_muxer(muxer_name: Literal["YAMUX", "MPLEX"]) -> None:
@ -155,6 +150,7 @@ def get_default_muxer_options() -> TMuxerOptions:
else: # YAMUX is default
return create_yamux_muxer_option()
def new_swarm(
key_pair: KeyPair | None = None,
muxer_opt: TMuxerOptions | None = None,
@ -162,8 +158,6 @@ def new_swarm(
peerstore_opt: IPeerStore | None = None,
muxer_preference: Literal["YAMUX", "MPLEX"] | None = None,
listen_addrs: Sequence[multiaddr.Multiaddr] | None = None,
retry_config: Optional["RetryConfig"] = None,
connection_config: Optional["ConnectionConfig"] = None,
) -> INetworkService:
"""
Create a swarm instance based on the parameters.
@ -206,9 +200,7 @@ def new_swarm(
key_pair, noise_privkey=noise_key_pair.private_key
),
TProtocol(secio.ID): secio.Transport(key_pair),
TProtocol(PLAINTEXT_PROTOCOL_ID): InsecureTransport(
key_pair, peerstore=peerstore_opt
),
TProtocol(PLAINTEXT_PROTOCOL_ID): InsecureTransport(key_pair),
}
# Use given muxer preference if provided, otherwise use global default
@ -240,14 +232,7 @@ def new_swarm(
# Store our key pair in peerstore
peerstore.add_key_pair(id_opt, key_pair)
return Swarm(
id_opt,
peerstore,
upgrader,
transport,
retry_config=retry_config,
connection_config=connection_config
)
return Swarm(id_opt, peerstore, upgrader, transport)
def new_host(
@ -258,9 +243,6 @@ def new_host(
disc_opt: IPeerRouting | None = None,
muxer_preference: Literal["YAMUX", "MPLEX"] | None = None,
listen_addrs: Sequence[multiaddr.Multiaddr] | None = None,
enable_mDNS: bool = False,
bootstrap: list[str] | None = None,
negotiate_timeout: int = DEFAULT_NEGOTIATE_TIMEOUT,
) -> IHost:
"""
Create a new libp2p host based on the given parameters.
@ -272,8 +254,6 @@ def new_host(
:param disc_opt: optional discovery
:param muxer_preference: optional explicit muxer preference
:param listen_addrs: optional list of multiaddrs to listen on
:param enable_mDNS: whether to enable mDNS discovery
:param bootstrap: optional list of bootstrap peer addresses as strings
:return: return a host instance
"""
swarm = new_swarm(
@ -286,13 +266,8 @@ def new_host(
)
if disc_opt is not None:
return RoutedHost(swarm, disc_opt, enable_mDNS, bootstrap)
return BasicHost(
network=swarm,
enable_mDNS=enable_mDNS,
bootstrap=bootstrap,
negotitate_timeout=negotiate_timeout
)
return RoutedHost(swarm, disc_opt)
return BasicHost(swarm)
__version__ = __version("libp2p")

1076
libp2p/abc.py
View File

File diff suppressed because it is too large Load Diff

4
libp2p/crypto/pb/crypto_pb2.py
View File

@ -13,7 +13,7 @@ _sym_db = _symbol_database.Default()
DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x1dlibp2p/crypto/pb/crypto.proto\x12\tcrypto.pb\"?\n\tPublicKey\x12$\n\x08key_type\x18\x01 \x02(\x0e\x32\x12.crypto.pb.KeyType\x12\x0c\n\x04\x64\x61ta\x18\x02 \x02(\x0c\"@\n\nPrivateKey\x12$\n\x08key_type\x18\x01 \x02(\x0e\x32\x12.crypto.pb.KeyType\x12\x0c\n\x04\x64\x61ta\x18\x02 \x02(\x0c*S\n\x07KeyType\x12\x07\n\x03RSA\x10\x00\x12\x0b\n\x07\x45\x64\x32\x35\x35\x31\x39\x10\x01\x12\r\n\tSecp256k1\x10\x02\x12\t\n\x05\x45\x43\x44SA\x10\x03\x12\x0c\n\x08\x45\x43\x43_P256\x10\x04\x12\n\n\x06X25519\x10\x05')
DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x1dlibp2p/crypto/pb/crypto.proto\x12\tcrypto.pb\"?\n\tPublicKey\x12$\n\x08key_type\x18\x01 \x02(\x0e\x32\x12.crypto.pb.KeyType\x12\x0c\n\x04\x64\x61ta\x18\x02 \x02(\x0c\"@\n\nPrivateKey\x12$\n\x08key_type\x18\x01 \x02(\x0e\x32\x12.crypto.pb.KeyType\x12\x0c\n\x04\x64\x61ta\x18\x02 \x02(\x0c*G\n\x07KeyType\x12\x07\n\x03RSA\x10\x00\x12\x0b\n\x07\x45\x64\x32\x35\x35\x31\x39\x10\x01\x12\r\n\tSecp256k1\x10\x02\x12\t\n\x05\x45\x43\x44SA\x10\x03\x12\x0c\n\x08\x45\x43\x43_P256\x10\x04')
_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, globals())
_builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'libp2p.crypto.pb.crypto_pb2', globals())
@ -21,7 +21,7 @@ if _descriptor._USE_C_DESCRIPTORS == False:
DESCRIPTOR._options = None
_KEYTYPE._serialized_start=175
_KEYTYPE._serialized_end=258
_KEYTYPE._serialized_end=246
_PUBLICKEY._serialized_start=44
_PUBLICKEY._serialized_end=107
_PRIVATEKEY._serialized_start=109

2
libp2p/crypto/pb/crypto_pb2.pyi
View File

@ -28,7 +28,6 @@ class _KeyTypeEnumTypeWrapper(google.protobuf.internal.enum_type_wrapper._EnumTy
Secp256k1: _KeyType.ValueType # 2
ECDSA: _KeyType.ValueType # 3
ECC_P256: _KeyType.ValueType # 4
X25519: _KeyType.ValueType # 5
class KeyType(_KeyType, metaclass=_KeyTypeEnumTypeWrapper): ...
@ -37,7 +36,6 @@ Ed25519: KeyType.ValueType # 1
Secp256k1: KeyType.ValueType # 2
ECDSA: KeyType.ValueType # 3
ECC_P256: KeyType.ValueType # 4
X25519: KeyType.ValueType # 5
global___KeyType = KeyType
@typing.final

0
libp2p/discovery/__init__.py
View File

5
libp2p/discovery/bootstrap/__init__.py
View File

@ -1,5 +0,0 @@
"""Bootstrap peer discovery module for py-libp2p."""
from .bootstrap import BootstrapDiscovery
__all__ = ["BootstrapDiscovery"]

312
libp2p/discovery/bootstrap/bootstrap.py
View File

@ -1,312 +0,0 @@
import logging
from multiaddr import Multiaddr
from multiaddr.resolvers import DNSResolver
import trio
from libp2p.abc import ID, INetworkService, PeerInfo
from libp2p.discovery.bootstrap.utils import validate_bootstrap_addresses
from libp2p.discovery.events.peerDiscovery import peerDiscovery
from libp2p.network.exceptions import SwarmException
from libp2p.peer.peerinfo import info_from_p2p_addr
from libp2p.peer.peerstore import PERMANENT_ADDR_TTL
logger = logging.getLogger("libp2p.discovery.bootstrap")
resolver = DNSResolver()
DEFAULT_CONNECTION_TIMEOUT = 10
class BootstrapDiscovery:
"""
Bootstrap-based peer discovery for py-libp2p.
Connects to predefined bootstrap peers and adds them to peerstore.
"""
def __init__(self, swarm: INetworkService, bootstrap_addrs: list[str]):
"""
Initialize BootstrapDiscovery.
Args:
swarm: The network service (swarm) instance
bootstrap_addrs: List of bootstrap peer multiaddresses
"""
self.swarm = swarm
self.peerstore = swarm.peerstore
self.bootstrap_addrs = bootstrap_addrs or []
self.discovered_peers: set[str] = set()
self.connection_timeout: int = DEFAULT_CONNECTION_TIMEOUT
async def start(self) -> None:
"""Process bootstrap addresses and emit peer discovery events in parallel."""
logger.info(
f"Starting bootstrap discovery with "
f"{len(self.bootstrap_addrs)} bootstrap addresses"
)
# Show all bootstrap addresses being processed
for i, addr in enumerate(self.bootstrap_addrs):
logger.debug(f"{i + 1}. {addr}")
# Validate and filter bootstrap addresses
self.bootstrap_addrs = validate_bootstrap_addresses(self.bootstrap_addrs)
logger.info(f"Valid addresses after validation: {len(self.bootstrap_addrs)}")
# Use Trio nursery for PARALLEL address processing
try:
async with trio.open_nursery() as nursery:
logger.debug(
f"Starting {len(self.bootstrap_addrs)} parallel address "
f"processing tasks"
)
# Start all bootstrap address processing tasks in parallel
for addr_str in self.bootstrap_addrs:
logger.debug(f"Starting parallel task for: {addr_str}")
nursery.start_soon(self._process_bootstrap_addr, addr_str)
# The nursery will wait for all address processing tasks to complete
logger.debug(
"Nursery active - waiting for address processing tasks to complete"
)
except trio.Cancelled:
logger.debug("Bootstrap address processing cancelled - cleaning up tasks")
raise
except Exception as e:
logger.error(f"Bootstrap address processing failed: {e}")
raise
logger.info("Bootstrap discovery startup complete - all tasks finished")
def stop(self) -> None:
"""Clean up bootstrap discovery resources."""
logger.info("Stopping bootstrap discovery and cleaning up tasks")
# Clear discovered peers
self.discovered_peers.clear()
logger.debug("Bootstrap discovery cleanup completed")
async def _process_bootstrap_addr(self, addr_str: str) -> None:
"""Convert string address to PeerInfo and add to peerstore."""
try:
try:
multiaddr = Multiaddr(addr_str)
except Exception as e:
logger.debug(f"Invalid multiaddr format '{addr_str}': {e}")
return
if self.is_dns_addr(multiaddr):
resolved_addrs = await resolver.resolve(multiaddr)
if resolved_addrs is None:
logger.warning(f"DNS resolution returned None for: {addr_str}")
return
peer_id_str = multiaddr.get_peer_id()
if peer_id_str is None:
logger.warning(f"Missing peer ID in DNS address: {addr_str}")
return
peer_id = ID.from_base58(peer_id_str)
addrs = [addr for addr in resolved_addrs]
if not addrs:
logger.warning(f"No addresses resolved for DNS address: {addr_str}")
return
peer_info = PeerInfo(peer_id, addrs)
await self.add_addr(peer_info)
else:
peer_info = info_from_p2p_addr(multiaddr)
await self.add_addr(peer_info)
except Exception as e:
logger.warning(f"Failed to process bootstrap address {addr_str}: {e}")
def is_dns_addr(self, addr: Multiaddr) -> bool:
"""Check if the address is a DNS address."""
return any(protocol.name == "dnsaddr" for protocol in addr.protocols())
async def add_addr(self, peer_info: PeerInfo) -> None:
"""
Add a peer to the peerstore, emit discovery event,
and attempt connection in parallel.
"""
logger.debug(
f"Adding peer {peer_info.peer_id} with {len(peer_info.addrs)} addresses"
)
# Skip if it's our own peer
if peer_info.peer_id == self.swarm.get_peer_id():
logger.debug(f"Skipping own peer ID: {peer_info.peer_id}")
return
# Filter addresses to only include IPv4+TCP (only supported protocol)
ipv4_tcp_addrs = []
filtered_out_addrs = []
for addr in peer_info.addrs:
if self._is_ipv4_tcp_addr(addr):
ipv4_tcp_addrs.append(addr)
else:
filtered_out_addrs.append(addr)
# Log filtering results
logger.debug(
f"Address filtering for {peer_info.peer_id}: "
f"{len(ipv4_tcp_addrs)} IPv4+TCP, {len(filtered_out_addrs)} filtered"
)
# Skip peer if no IPv4+TCP addresses available
if not ipv4_tcp_addrs:
logger.warning(
f"❌ No IPv4+TCP addresses for {peer_info.peer_id} - "
f"skipping connection attempts"
)
return
# Add only IPv4+TCP addresses to peerstore
self.peerstore.add_addrs(peer_info.peer_id, ipv4_tcp_addrs, PERMANENT_ADDR_TTL)
# Only emit discovery event if this is the first time we see this peer
peer_id_str = str(peer_info.peer_id)
if peer_id_str not in self.discovered_peers:
# Track discovered peer
self.discovered_peers.add(peer_id_str)
# Emit peer discovery event
peerDiscovery.emit_peer_discovered(peer_info)
logger.info(f"Peer discovered: {peer_info.peer_id}")
# Connect to peer (parallel across different bootstrap addresses)
logger.debug("Connecting to discovered peer...")
await self._connect_to_peer(peer_info.peer_id)
else:
logger.debug(
f"Additional addresses added for existing peer: {peer_info.peer_id}"
)
# Even for existing peers, try to connect if not already connected
if peer_info.peer_id not in self.swarm.connections:
logger.debug("Connecting to existing peer...")
await self._connect_to_peer(peer_info.peer_id)
async def _connect_to_peer(self, peer_id: ID) -> None:
"""
Attempt to establish a connection to a peer with timeout.
Uses swarm.dial_peer to connect using addresses stored in peerstore.
Times out after self.connection_timeout seconds to prevent hanging.
"""
logger.debug(f"Connection attempt for peer: {peer_id}")
# Pre-connection validation: Check if already connected
if peer_id in self.swarm.connections:
logger.debug(
f"Already connected to {peer_id} - skipping connection attempt"
)
return
# Check available addresses before attempting connection
available_addrs = self.peerstore.addrs(peer_id)
logger.debug(f"Connecting to {peer_id} ({len(available_addrs)} addresses)")
if not available_addrs:
logger.error(f"❌ No addresses available for {peer_id} - cannot connect")
return
# Record start time for connection attempt monitoring
connection_start_time = trio.current_time()
try:
with trio.move_on_after(self.connection_timeout):
# Log connection attempt
logger.debug(
f"Attempting connection to {peer_id} using "
f"{len(available_addrs)} addresses"
)
# Use swarm.dial_peer to connect using stored addresses
await self.swarm.dial_peer(peer_id)
# Calculate connection time
connection_time = trio.current_time() - connection_start_time
# Post-connection validation: Verify connection was actually established
if peer_id in self.swarm.connections:
logger.info(
f"✅ Connected to {peer_id} (took {connection_time:.2f}s)"
)
else:
logger.warning(
f"Dial succeeded but connection not found for {peer_id}"
)
except trio.TooSlowError:
logger.warning(
f"❌ Connection to {peer_id} timed out after {self.connection_timeout}s"
)
except SwarmException as e:
# Calculate failed connection time
failed_connection_time = trio.current_time() - connection_start_time
# Enhanced error logging
error_msg = str(e)
if "no addresses established a successful connection" in error_msg:
logger.warning(
f"❌ Failed to connect to {peer_id} after trying all "
f"{len(available_addrs)} addresses "
f"(took {failed_connection_time:.2f}s)"
)
# Log individual address failures if this is a MultiError
if (
e.__cause__ is not None
and hasattr(e.__cause__, "exceptions")
and getattr(e.__cause__, "exceptions", None) is not None
):
exceptions_list = getattr(e.__cause__, "exceptions")
logger.debug("📋 Individual address failure details:")
for i, addr_exception in enumerate(exceptions_list, 1):
logger.debug(f"Address {i}: {addr_exception}")
# Also log the actual address that failed
if i <= len(available_addrs):
logger.debug(f"Failed address: {available_addrs[i - 1]}")
else:
logger.warning("No detailed exception information available")
else:
logger.warning(
f"❌ Failed to connect to {peer_id}: {e} "
f"(took {failed_connection_time:.2f}s)"
)
except Exception as e:
# Handle unexpected errors that aren't swarm-specific
failed_connection_time = trio.current_time() - connection_start_time
logger.error(
f"❌ Unexpected error connecting to {peer_id}: "
f"{e} (took {failed_connection_time:.2f}s)"
)
# Don't re-raise to prevent killing the nursery and other parallel tasks
def _is_ipv4_tcp_addr(self, addr: Multiaddr) -> bool:
"""
Check if address is IPv4 with TCP protocol only.
Filters out IPv6, UDP, QUIC, WebSocket, and other unsupported protocols.
Only IPv4+TCP addresses are supported by the current transport.
"""
try:
protocols = addr.protocols()
# Must have IPv4 protocol
has_ipv4 = any(p.name == "ip4" for p in protocols)
if not has_ipv4:
return False
# Must have TCP protocol
has_tcp = any(p.name == "tcp" for p in protocols)
if not has_tcp:
return False
return True
except Exception:
# If we can't parse the address, don't use it
return False

51
libp2p/discovery/bootstrap/utils.py
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@ -1,51 +0,0 @@
"""Utility functions for bootstrap discovery."""
import logging
from multiaddr import Multiaddr
from libp2p.peer.peerinfo import InvalidAddrError, PeerInfo, info_from_p2p_addr
logger = logging.getLogger("libp2p.discovery.bootstrap.utils")
def validate_bootstrap_addresses(addrs: list[str]) -> list[str]:
"""
Validate and filter bootstrap addresses.
:param addrs: List of bootstrap address strings
:return: List of valid bootstrap addresses
"""
valid_addrs = []
for addr_str in addrs:
try:
# Try to parse as multiaddr
multiaddr = Multiaddr(addr_str)
# Try to extract peer info (this validates the p2p component)
info_from_p2p_addr(multiaddr)
valid_addrs.append(addr_str)
logger.debug(f"Valid bootstrap address: {addr_str}")
except (InvalidAddrError, ValueError, Exception) as e:
logger.warning(f"Invalid bootstrap address '{addr_str}': {e}")
continue
return valid_addrs
def parse_bootstrap_peer_info(addr_str: str) -> PeerInfo | None:
"""
Parse bootstrap address string into PeerInfo.
:param addr_str: Bootstrap address string
:return: PeerInfo object or None if parsing fails
"""
try:
multiaddr = Multiaddr(addr_str)
return info_from_p2p_addr(multiaddr)
except Exception as e:
logger.error(f"Failed to parse bootstrap address '{addr_str}': {e}")
return None

0
libp2p/discovery/events/__init__.py
View File

26
libp2p/discovery/events/peerDiscovery.py
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@ -1,26 +0,0 @@
from collections.abc import (
Callable,
)
from libp2p.abc import (
PeerInfo,
)
TTL: int = 60 * 60 # Time-to-live for discovered peers in seconds
class PeerDiscovery:
def __init__(self) -> None:
self._peer_discovered_handlers: list[Callable[[PeerInfo], None]] = []
def register_peer_discovered_handler(
self, handler: Callable[[PeerInfo], None]
) -> None:
self._peer_discovered_handlers.append(handler)
def emit_peer_discovered(self, peer_info: PeerInfo) -> None:
for handler in self._peer_discovered_handlers:
handler(peer_info)
peerDiscovery = PeerDiscovery()

0
libp2p/discovery/mdns/__init__.py
View File

91
libp2p/discovery/mdns/broadcaster.py
View File

@ -1,91 +0,0 @@
import logging
import socket
from zeroconf import (
EventLoopBlocked,
ServiceInfo,
Zeroconf,
)
logger = logging.getLogger("libp2p.discovery.mdns.broadcaster")
class PeerBroadcaster:
"""
Broadcasts this peer's presence on the local network using mDNS/zeroconf.
Registers a service with the peer's ID in the TXT record as per libp2p spec.
"""
def __init__(
self,
zeroconf: Zeroconf,
service_type: str,
service_name: str,
peer_id: str,
port: int,
):
self.zeroconf = zeroconf
self.service_type = service_type
self.peer_id = peer_id
self.port = port
self.service_name = service_name
# Get the local IP address
local_ip = self._get_local_ip()
hostname = socket.gethostname()
self.service_info = ServiceInfo(
type_=self.service_type,
name=self.service_name,
port=self.port,
properties={b"id": self.peer_id.encode()},
server=f"{hostname}.local.",
addresses=[socket.inet_aton(local_ip)],
)
def _get_local_ip(self) -> str:
"""Get the local IP address of this machine"""
try:
# Connect to a remote address to determine the local IP
# This doesn't actually send data
with socket.socket(socket.AF_INET, socket.SOCK_DGRAM) as s:
s.connect(("8.8.8.8", 80))
local_ip = s.getsockname()[0]
return local_ip
except Exception:
# Fallback to localhost if we can't determine the IP
return "127.0.0.1"
def register(self) -> None:
"""Register the peer's mDNS service on the network."""
try:
self.zeroconf.register_service(self.service_info)
logger.debug(f"mDNS service registered: {self.service_name}")
except EventLoopBlocked as e:
logger.warning(
"EventLoopBlocked while registering mDNS '%s': %s", self.service_name, e
)
except Exception as e:
logger.error(
"Unexpected error during mDNS registration for '%s': %r",
self.service_name,
e,
)
def unregister(self) -> None:
"""Unregister the peer's mDNS service from the network."""
try:
self.zeroconf.unregister_service(self.service_info)
logger.debug(f"mDNS service unregistered: {self.service_name}")
except EventLoopBlocked as e:
logger.warning(
"EventLoopBlocked while unregistering mDNS '%s': %s",
self.service_name,
e,
)
except Exception as e:
logger.error(
"Unexpected error during mDNS unregistration for '%s': %r",
self.service_name,
e,
)

83
libp2p/discovery/mdns/listener.py
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@ -1,83 +0,0 @@
import logging
import socket
from zeroconf import (
ServiceBrowser,
ServiceInfo,
ServiceListener,
Zeroconf,
)
from libp2p.abc import IPeerStore, Multiaddr
from libp2p.discovery.events.peerDiscovery import peerDiscovery
from libp2p.peer.id import ID
from libp2p.peer.peerinfo import PeerInfo
logger = logging.getLogger("libp2p.discovery.mdns.listener")
class PeerListener(ServiceListener):
"""mDNS listener — now a true ServiceListener subclass."""
def __init__(
self,
peerstore: IPeerStore,
zeroconf: Zeroconf,
service_type: str,
service_name: str,
) -> None:
self.peerstore = peerstore
self.zeroconf = zeroconf
self.service_type = service_type
self.service_name = service_name
self.discovered_services: dict[str, ID] = {}
self.browser = ServiceBrowser(self.zeroconf, self.service_type, listener=self)
def add_service(self, zc: Zeroconf, type_: str, name: str) -> None:
if name == self.service_name:
return
logger.debug(f"Adding service: {name}")
info = zc.get_service_info(type_, name, timeout=5000)
if not info:
return
peer_info = self._extract_peer_info(info)
if peer_info:
self.discovered_services[name] = peer_info.peer_id
self.peerstore.add_addrs(peer_info.peer_id, peer_info.addrs, 10)
peerDiscovery.emit_peer_discovered(peer_info)
logger.debug(f"Discovered Peer: {peer_info.peer_id}")
def remove_service(self, zc: Zeroconf, type_: str, name: str) -> None:
if name == self.service_name:
return
logger.debug(f"Removing service: {name}")
peer_id = self.discovered_services.pop(name)
self.peerstore.clear_addrs(peer_id)
logger.debug(f"Removed Peer: {peer_id}")
def update_service(self, zc: Zeroconf, type_: str, name: str) -> None:
info = zc.get_service_info(type_, name, timeout=5000)
if not info:
return
peer_info = self._extract_peer_info(info)
if peer_info:
self.peerstore.clear_addrs(peer_info.peer_id)
self.peerstore.add_addrs(peer_info.peer_id, peer_info.addrs, 10)
logger.debug(f"Updated Peer {peer_info.peer_id}")
def _extract_peer_info(self, info: ServiceInfo) -> PeerInfo | None:
try:
addrs = [
Multiaddr(f"/ip4/{socket.inet_ntoa(addr)}/tcp/{info.port}")
for addr in info.addresses
]
pid_bytes = info.properties.get(b"id")
if not pid_bytes:
return None
pid = ID.from_base58(pid_bytes.decode())
return PeerInfo(peer_id=pid, addrs=addrs)
except Exception:
return None
def stop(self) -> None:
self.browser.cancel()

73
libp2p/discovery/mdns/mdns.py
View File

@ -1,73 +0,0 @@
"""
mDNS-based peer discovery for py-libp2p.
Conforms to https://github.com/libp2p/specs/blob/master/discovery/mdns.md
Uses zeroconf for mDNS broadcast/listen. Async operations use trio.
"""
import logging
from zeroconf import (
Zeroconf,
)
from libp2p.abc import (
INetworkService,
)
from .broadcaster import (
PeerBroadcaster,
)
from .listener import (
PeerListener,
)
from .utils import (
stringGen,
)
logger = logging.getLogger("libp2p.discovery.mdns")
SERVICE_TYPE = "_p2p._udp.local."
MCAST_PORT = 5353
MCAST_ADDR = "224.0.0.251"
class MDNSDiscovery:
"""
mDNS-based peer discovery for py-libp2p, using zeroconf.
Conforms to the libp2p mDNS discovery spec.
"""
def __init__(self, swarm: INetworkService, port: int = 8000):
self.peer_id = str(swarm.get_peer_id())
self.port = port
self.zeroconf = Zeroconf()
self.serviceName = f"{stringGen()}.{SERVICE_TYPE}"
self.peerstore = swarm.peerstore
self.swarm = swarm
self.broadcaster = PeerBroadcaster(
zeroconf=self.zeroconf,
service_type=SERVICE_TYPE,
service_name=self.serviceName,
peer_id=self.peer_id,
port=self.port,
)
self.listener = PeerListener(
zeroconf=self.zeroconf,
peerstore=self.peerstore,
service_type=SERVICE_TYPE,
service_name=self.serviceName,
)
def start(self) -> None:
"""Register this peer and start listening for others."""
logger.debug(
f"Starting mDNS discovery for peer {self.peer_id} on port {self.port}"
)
self.broadcaster.register()
# Listener is started in constructor
def stop(self) -> None:
"""Unregister this peer and clean up zeroconf resources."""
logger.debug("Stopping mDNS discovery")
self.broadcaster.unregister()
self.zeroconf.close()

11
libp2p/discovery/mdns/utils.py
View File

@ -1,11 +0,0 @@
import random
import string
def stringGen(len: int = 63) -> str:
"""Generate a random string of lowercase letters and digits."""
charset = string.ascii_lowercase + string.digits
result = []
for _ in range(len):
result.append(random.choice(charset))
return "".join(result)

17
libp2p/discovery/random_walk/__init__.py
View File

@ -1,17 +0,0 @@
"""Random walk discovery modules for py-libp2p."""
from .rt_refresh_manager import RTRefreshManager
from .random_walk import RandomWalk
from .exceptions import (
RoutingTableRefreshError,
RandomWalkError,
PeerValidationError,
)
__all__ = [
"RTRefreshManager",
"RandomWalk",
"RoutingTableRefreshError",
"RandomWalkError",
"PeerValidationError",
]

16
libp2p/discovery/random_walk/config.py
View File

@ -1,16 +0,0 @@
from typing import Final
# Timing constants (matching go-libp2p)
PEER_PING_TIMEOUT: Final[float] = 10.0 # seconds
REFRESH_QUERY_TIMEOUT: Final[float] = 60.0 # seconds
REFRESH_INTERVAL: Final[float] = 300.0 # 5 minutes
SUCCESSFUL_OUTBOUND_QUERY_GRACE_PERIOD: Final[float] = 60.0 # 1 minute
# Routing table thresholds
MIN_RT_REFRESH_THRESHOLD: Final[int] = 4 # Minimum peers before triggering refresh
MAX_N_BOOTSTRAPPERS: Final[int] = 2 # Maximum bootstrap peers to try
# Random walk specific
RANDOM_WALK_CONCURRENCY: Final[int] = 3 # Number of concurrent random walks
RANDOM_WALK_ENABLED: Final[bool] = True # Enable automatic random walks
RANDOM_WALK_RT_THRESHOLD: Final[int] = 20 # RT size threshold for peerstore fallback

19
libp2p/discovery/random_walk/exceptions.py
View File

@ -1,19 +0,0 @@
from libp2p.exceptions import BaseLibp2pError
class RoutingTableRefreshError(BaseLibp2pError):
"""Base exception for routing table refresh operations."""
pass
class RandomWalkError(RoutingTableRefreshError):
"""Exception raised during random walk operations."""
pass
class PeerValidationError(RoutingTableRefreshError):
"""Exception raised when peer validation fails."""
pass

218
libp2p/discovery/random_walk/random_walk.py
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@ -1,218 +0,0 @@
from collections.abc import Awaitable, Callable
import logging
import secrets
import trio
from libp2p.abc import IHost
from libp2p.discovery.random_walk.config import (
RANDOM_WALK_CONCURRENCY,
RANDOM_WALK_RT_THRESHOLD,
REFRESH_QUERY_TIMEOUT,
)
from libp2p.discovery.random_walk.exceptions import RandomWalkError
from libp2p.peer.id import ID
from libp2p.peer.peerinfo import PeerInfo
logger = logging.getLogger("libp2p.discovery.random_walk")
class RandomWalk:
"""
Random Walk implementation for peer discovery in Kademlia DHT.
Generates random peer IDs and performs FIND_NODE queries to discover
new peers and populate the routing table.
"""
def __init__(
self,
host: IHost,
local_peer_id: ID,
query_function: Callable[[bytes], Awaitable[list[ID]]],
):
"""
Initialize Random Walk module.
Args:
host: The libp2p host instance
local_peer_id: Local peer ID
query_function: Function to query for closest peers given target key bytes
"""
self.host = host
self.local_peer_id = local_peer_id
self.query_function = query_function
def generate_random_peer_id(self) -> str:
"""
Generate a completely random peer ID
for random walk queries.
Returns:
Random peer ID as string
"""
# Generate 32 random bytes (256 bits) - same as go-libp2p
random_bytes = secrets.token_bytes(32)
# Convert to hex string for query
return random_bytes.hex()
async def perform_random_walk(self) -> list[PeerInfo]:
"""
Perform a single random walk operation.
Returns:
List of validated peers discovered during the walk
"""
try:
# Generate random peer ID
random_peer_id = self.generate_random_peer_id()
logger.info(f"Starting random walk for peer ID: {random_peer_id}")
# Perform FIND_NODE query
discovered_peer_ids: list[ID] = []
with trio.move_on_after(REFRESH_QUERY_TIMEOUT):
# Call the query function with target key bytes
target_key = bytes.fromhex(random_peer_id)
discovered_peer_ids = await self.query_function(target_key) or []
if not discovered_peer_ids:
logger.debug(f"No peers discovered in random walk for {random_peer_id}")
return []
logger.info(
f"Discovered {len(discovered_peer_ids)} peers in random walk "
f"for {random_peer_id[:8]}..." # Show only first 8 chars for brevity
)
# Convert peer IDs to PeerInfo objects and validate
validated_peers: list[PeerInfo] = []
for peer_id in discovered_peer_ids:
try:
# Get addresses from peerstore
addrs = self.host.get_peerstore().addrs(peer_id)
if addrs:
peer_info = PeerInfo(peer_id, addrs)
validated_peers.append(peer_info)
except Exception as e:
logger.debug(f"Failed to create PeerInfo for {peer_id}: {e}")
continue
return validated_peers
except Exception as e:
logger.error(f"Random walk failed: {e}")
raise RandomWalkError(f"Random walk operation failed: {e}") from e
async def run_concurrent_random_walks(
self, count: int = RANDOM_WALK_CONCURRENCY, current_routing_table_size: int = 0
) -> list[PeerInfo]:
"""
Run multiple random walks concurrently.
Args:
count: Number of concurrent random walks to perform
current_routing_table_size: Current size of routing table (for optimization)
Returns:
Combined list of all validated peers discovered
"""
all_validated_peers: list[PeerInfo] = []
logger.info(f"Starting {count} concurrent random walks")
# First, try to add peers from peerstore if routing table is small
if current_routing_table_size < RANDOM_WALK_RT_THRESHOLD:
try:
peerstore_peers = self._get_peerstore_peers()
if peerstore_peers:
logger.debug(
f"RT size ({current_routing_table_size}) below threshold, "
f"adding {len(peerstore_peers)} peerstore peers"
)
all_validated_peers.extend(peerstore_peers)
except Exception as e:
logger.warning(f"Error processing peerstore peers: {e}")
async def single_walk() -> None:
try:
peers = await self.perform_random_walk()
all_validated_peers.extend(peers)
except Exception as e:
logger.warning(f"Concurrent random walk failed: {e}")
return
# Run concurrent random walks
async with trio.open_nursery() as nursery:
for _ in range(count):
nursery.start_soon(single_walk)
# Remove duplicates based on peer ID
unique_peers = {}
for peer in all_validated_peers:
unique_peers[peer.peer_id] = peer
result = list(unique_peers.values())
logger.info(
f"Concurrent random walks completed: {len(result)} unique peers discovered"
)
return result
def _get_peerstore_peers(self) -> list[PeerInfo]:
"""
Get peer info objects from the host's peerstore.
Returns:
List of PeerInfo objects from peerstore
"""
try:
peerstore = self.host.get_peerstore()
peer_ids = peerstore.peers_with_addrs()
peer_infos = []
for peer_id in peer_ids:
try:
# Skip local peer
if peer_id == self.local_peer_id:
continue
peer_info = peerstore.peer_info(peer_id)
if peer_info and peer_info.addrs:
# Filter for compatible addresses (TCP + IPv4)
if self._has_compatible_addresses(peer_info):
peer_infos.append(peer_info)
except Exception as e:
logger.debug(f"Error getting peer info for {peer_id}: {e}")
return peer_infos
except Exception as e:
logger.warning(f"Error accessing peerstore: {e}")
return []
def _has_compatible_addresses(self, peer_info: PeerInfo) -> bool:
"""
Check if a peer has TCP+IPv4 compatible addresses.
Args:
peer_info: PeerInfo to check
Returns:
True if peer has compatible addresses
"""
if not peer_info.addrs:
return False
for addr in peer_info.addrs:
addr_str = str(addr)
# Check for TCP and IPv4 compatibility, avoid QUIC
if "/tcp/" in addr_str and "/ip4/" in addr_str and "/quic" not in addr_str:
return True
return False

208
libp2p/discovery/random_walk/rt_refresh_manager.py
View File

@ -1,208 +0,0 @@
from collections.abc import Awaitable, Callable
import logging
import time
from typing import Protocol
import trio
from libp2p.abc import IHost
from libp2p.discovery.random_walk.config import (
MIN_RT_REFRESH_THRESHOLD,
RANDOM_WALK_CONCURRENCY,
RANDOM_WALK_ENABLED,
REFRESH_INTERVAL,
)
from libp2p.discovery.random_walk.exceptions import RoutingTableRefreshError
from libp2p.discovery.random_walk.random_walk import RandomWalk
from libp2p.peer.id import ID
from libp2p.peer.peerinfo import PeerInfo
class RoutingTableProtocol(Protocol):
"""Protocol for routing table operations needed by RT refresh manager."""
def size(self) -> int:
"""Return the current size of the routing table."""
...
async def add_peer(self, peer_obj: PeerInfo) -> bool:
"""Add a peer to the routing table."""
...
logger = logging.getLogger("libp2p.discovery.random_walk.rt_refresh_manager")
class RTRefreshManager:
"""
Routing Table Refresh Manager for py-libp2p.
Manages periodic routing table refreshes and random walk operations
to maintain routing table health and discover new peers.
"""
def __init__(
self,
host: IHost,
routing_table: RoutingTableProtocol,
local_peer_id: ID,
query_function: Callable[[bytes], Awaitable[list[ID]]],
enable_auto_refresh: bool = RANDOM_WALK_ENABLED,
refresh_interval: float = REFRESH_INTERVAL,
min_refresh_threshold: int = MIN_RT_REFRESH_THRESHOLD,
):
"""
Initialize RT Refresh Manager.
Args:
host: The libp2p host instance
routing_table: Routing table of host
local_peer_id: Local peer ID
query_function: Function to query for closest peers given target key bytes
enable_auto_refresh: Whether to enable automatic refresh
refresh_interval: Interval between refreshes in seconds
min_refresh_threshold: Minimum RT size before triggering refresh
"""
self.host = host
self.routing_table = routing_table
self.local_peer_id = local_peer_id
self.query_function = query_function
self.enable_auto_refresh = enable_auto_refresh
self.refresh_interval = refresh_interval
self.min_refresh_threshold = min_refresh_threshold
# Initialize random walk module
self.random_walk = RandomWalk(
host=host,
local_peer_id=self.local_peer_id,
query_function=query_function,
)
# Control variables
self._running = False
self._nursery: trio.Nursery | None = None
# Tracking
self._last_refresh_time = 0.0
self._refresh_done_callbacks: list[Callable[[], None]] = []
async def start(self) -> None:
"""Start the RT Refresh Manager."""
if self._running:
logger.warning("RT Refresh Manager is already running")
return
self._running = True
logger.info("Starting RT Refresh Manager")
# Start the main loop
async with trio.open_nursery() as nursery:
self._nursery = nursery
nursery.start_soon(self._main_loop)
async def stop(self) -> None:
"""Stop the RT Refresh Manager."""
if not self._running:
return
logger.info("Stopping RT Refresh Manager")
self._running = False
async def _main_loop(self) -> None:
"""Main loop for the RT Refresh Manager."""
logger.info("RT Refresh Manager main loop started")
# Initial refresh if auto-refresh is enabled
if self.enable_auto_refresh:
await self._do_refresh(force=True)
try:
while self._running:
async with trio.open_nursery() as nursery:
# Schedule periodic refresh if enabled
if self.enable_auto_refresh:
nursery.start_soon(self._periodic_refresh_task)
except Exception as e:
logger.error(f"RT Refresh Manager main loop error: {e}")
finally:
logger.info("RT Refresh Manager main loop stopped")
async def _periodic_refresh_task(self) -> None:
"""Task for periodic refreshes."""
while self._running:
await trio.sleep(self.refresh_interval)
if self._running:
await self._do_refresh()
async def _do_refresh(self, force: bool = False) -> None:
"""
Perform routing table refresh operation.
Args:
force: Whether to force refresh regardless of timing
"""
try:
current_time = time.time()
# Check if refresh is needed
if not force:
if current_time - self._last_refresh_time < self.refresh_interval:
logger.debug("Skipping refresh: interval not elapsed")
return
if self.routing_table.size() >= self.min_refresh_threshold:
logger.debug("Skipping refresh: routing table size above threshold")
return
logger.info(f"Starting routing table refresh (force={force})")
start_time = current_time
# Perform random walks to discover new peers
logger.info("Running concurrent random walks to discover new peers")
current_rt_size = self.routing_table.size()
discovered_peers = await self.random_walk.run_concurrent_random_walks(
count=RANDOM_WALK_CONCURRENCY,
current_routing_table_size=current_rt_size,
)
# Add discovered peers to routing table
added_count = 0
for peer_info in discovered_peers:
result = await self.routing_table.add_peer(peer_info)
if result:
added_count += 1
self._last_refresh_time = current_time
duration = time.time() - start_time
logger.info(
f"Routing table refresh completed: "
f"{added_count}/{len(discovered_peers)} peers added, "
f"RT size: {self.routing_table.size()}, "
f"duration: {duration:.2f}s"
)
# Notify refresh completion
for callback in self._refresh_done_callbacks:
try:
callback()
except Exception as e:
logger.warning(f"Refresh callback error: {e}")
except Exception as e:
logger.error(f"Routing table refresh failed: {e}")
raise RoutingTableRefreshError(f"Refresh operation failed: {e}") from e
def add_refresh_done_callback(self, callback: Callable[[], None]) -> None:
"""Add a callback to be called when refresh completes."""
self._refresh_done_callbacks.append(callback)
def remove_refresh_done_callback(self, callback: Callable[[], None]) -> None:
"""Remove a refresh completion callback."""
if callback in self._refresh_done_callbacks:
self._refresh_done_callbacks.remove(callback)

70
libp2p/host/basic_host.py
View File

@ -29,8 +29,6 @@ from libp2p.custom_types import (
StreamHandlerFn,
TProtocol,
)
from libp2p.discovery.bootstrap.bootstrap import BootstrapDiscovery
from libp2p.discovery.mdns.mdns import MDNSDiscovery
from libp2p.host.defaults import (
get_default_protocols,
)
@ -43,7 +41,6 @@ from libp2p.peer.id import (
from libp2p.peer.peerinfo import (
PeerInfo,
)
from libp2p.peer.peerstore import create_signed_peer_record
from libp2p.protocol_muxer.exceptions import (
MultiselectClientError,
MultiselectError,
@ -73,7 +70,6 @@ if TYPE_CHECKING:
logger = logging.getLogger("libp2p.network.basic_host")
DEFAULT_NEGOTIATE_TIMEOUT = 5
class BasicHost(IHost):
@ -93,31 +89,15 @@ class BasicHost(IHost):
def __init__(
self,
network: INetworkService,
enable_mDNS: bool = False,
bootstrap: list[str] | None = None,
default_protocols: Optional["OrderedDict[TProtocol, StreamHandlerFn]"] = None,
negotitate_timeout: int = DEFAULT_NEGOTIATE_TIMEOUT,
) -> None:
self._network = network
self._network.set_stream_handler(self._swarm_stream_handler)
self.peerstore = self._network.peerstore
self.negotiate_timeout = negotitate_timeout
# Protocol muxing
default_protocols = default_protocols or get_default_protocols(self)
self.multiselect = Multiselect(dict(default_protocols.items()))
self.multiselect_client = MultiselectClient()
if enable_mDNS:
self.mDNS = MDNSDiscovery(network)
if bootstrap:
self.bootstrap = BootstrapDiscovery(network, bootstrap)
# Cache a signed-record if the local-node in the PeerStore
envelope = create_signed_peer_record(
self.get_id(),
self.get_addrs(),
self.get_private_key(),
)
self.get_peerstore().set_local_record(envelope)
def get_id(self) -> ID:
"""
@ -182,19 +162,7 @@ class BasicHost(IHost):
network = self.get_network()
async with background_trio_service(network):
await network.listen(*listen_addrs)
if hasattr(self, "mDNS") and self.mDNS is not None:
logger.debug("Starting mDNS Discovery")
self.mDNS.start()
if hasattr(self, "bootstrap") and self.bootstrap is not None:
logger.debug("Starting Bootstrap Discovery")
await self.bootstrap.start()
try:
yield
finally:
if hasattr(self, "mDNS") and self.mDNS is not None:
self.mDNS.stop()
if hasattr(self, "bootstrap") and self.bootstrap is not None:
self.bootstrap.stop()
yield
return _run()
@ -210,10 +178,7 @@ class BasicHost(IHost):
self.multiselect.add_handler(protocol_id, stream_handler)
async def new_stream(
self,
peer_id: ID,
protocol_ids: Sequence[TProtocol],
negotitate_timeout: int = DEFAULT_NEGOTIATE_TIMEOUT,
self, peer_id: ID, protocol_ids: Sequence[TProtocol]
) -> INetStream:
"""
:param peer_id: peer_id that host is connecting
@ -225,9 +190,7 @@ class BasicHost(IHost):
# Perform protocol muxing to determine protocol to use
try:
selected_protocol = await self.multiselect_client.select_one_of(
list(protocol_ids),
MultiselectCommunicator(net_stream),
negotitate_timeout,
list(protocol_ids), MultiselectCommunicator(net_stream)
)
except MultiselectClientError as error:
logger.debug("fail to open a stream to peer %s, error=%s", peer_id, error)
@ -237,12 +200,7 @@ class BasicHost(IHost):
net_stream.set_protocol(selected_protocol)
return net_stream
async def send_command(
self,
peer_id: ID,
command: str,
response_timeout: int = DEFAULT_NEGOTIATE_TIMEOUT,
) -> list[str]:
async def send_command(self, peer_id: ID, command: str) -> list[str]:
"""
Send a multistream-select command to the specified peer and return
the response.
@ -256,7 +214,7 @@ class BasicHost(IHost):
try:
response = await self.multiselect_client.query_multistream_command(
MultiselectCommunicator(new_stream), command, response_timeout
MultiselectCommunicator(new_stream), command
)
except MultiselectClientError as error:
logger.debug("fail to open a stream to peer %s, error=%s", peer_id, error)
@ -295,13 +253,8 @@ class BasicHost(IHost):
# Perform protocol muxing to determine protocol to use
try:
protocol, handler = await self.multiselect.negotiate(
MultiselectCommunicator(net_stream), self.negotiate_timeout
MultiselectCommunicator(net_stream)
)
if protocol is None:
await net_stream.reset()
raise StreamFailure(
"Failed to negotiate protocol: no protocol selected"
)
except MultiselectError as error:
peer_id = net_stream.muxed_conn.peer_id
logger.debug(
@ -309,13 +262,6 @@ class BasicHost(IHost):
)
await net_stream.reset()
return
if protocol is None:
logger.debug(
"no protocol negotiated, closing stream from peer %s",
net_stream.muxed_conn.peer_id,
)
await net_stream.reset()
return
net_stream.set_protocol(protocol)
if handler is None:
logger.debug(
@ -343,7 +289,7 @@ class BasicHost(IHost):
:param peer_id: ID of the peer to check
:return: True if peer has an active connection, False otherwise
"""
return len(self._network.get_connections(peer_id)) > 0
return peer_id in self._network.connections
def get_peer_connection_info(self, peer_id: ID) -> INetConn | None:
"""
@ -352,4 +298,4 @@ class BasicHost(IHost):
:param peer_id: ID of the peer to get info for
:return: Connection object if peer is connected, None otherwise
"""
return self._network.get_connection(peer_id)
return self._network.connections.get(peer_id)

5
libp2p/host/defaults.py
View File

@ -26,8 +26,5 @@ if TYPE_CHECKING:
def get_default_protocols(host: IHost) -> "OrderedDict[TProtocol, StreamHandlerFn]":
return OrderedDict(
(
(IdentifyID, identify_handler_for(host, use_varint_format=True)),
(PingID, handle_ping),
)
((IdentifyID, identify_handler_for(host)), (PingID, handle_ping))
)

10
libp2p/host/routed_host.py
View File

@ -18,14 +18,8 @@ from libp2p.peer.peerinfo import (
class RoutedHost(BasicHost):
_router: IPeerRouting
def __init__(
self,
network: INetworkService,
router: IPeerRouting,
enable_mDNS: bool = False,
bootstrap: list[str] | None = None,
):
super().__init__(network, enable_mDNS, bootstrap)
def __init__(self, network: INetworkService, router: IPeerRouting):
super().__init__(network)
self._router = router
async def connect(self, peer_info: PeerInfo) -> None:

67
libp2p/identity/identify/identify.py
View File

@ -15,11 +15,8 @@ from libp2p.custom_types import (
from libp2p.network.stream.exceptions import (
StreamClosed,
)
from libp2p.peer.peerstore import env_to_send_in_RPC
from libp2p.utils import (
decode_varint_with_size,
get_agent_version,
varint,
)
from .pb.identify_pb2 import (
@ -62,10 +59,7 @@ def _mk_identify_protobuf(
) -> Identify:
public_key = host.get_public_key()
laddrs = host.get_addrs()
protocols = tuple(str(p) for p in host.get_mux().get_protocols() if p is not None)
# Create a signed peer-record for the remote peer
envelope_bytes, _ = env_to_send_in_RPC(host)
protocols = host.get_mux().get_protocols()
observed_addr = observed_multiaddr.to_bytes() if observed_multiaddr else b""
return Identify(
@ -75,51 +69,10 @@ def _mk_identify_protobuf(
listen_addrs=map(_multiaddr_to_bytes, laddrs),
observed_addr=observed_addr,
protocols=protocols,
signedPeerRecord=envelope_bytes,
)
def parse_identify_response(response: bytes) -> Identify:
"""
Parse identify response that could be either:
- Old format: raw protobuf
- New format: length-prefixed protobuf
This function provides backward and forward compatibility.
"""
# Try new format first: length-prefixed protobuf
if len(response) >= 1:
length, varint_size = decode_varint_with_size(response)
if varint_size > 0 and length > 0 and varint_size + length <= len(response):
protobuf_data = response[varint_size : varint_size + length]
try:
identify_response = Identify()
identify_response.ParseFromString(protobuf_data)
# Sanity check: must have agent_version (protocol_version is optional)
if identify_response.agent_version:
logger.debug(
"Parsed length-prefixed identify response (new format)"
)
return identify_response
except Exception:
pass # Fall through to old format
# Fall back to old format: raw protobuf
try:
identify_response = Identify()
identify_response.ParseFromString(response)
logger.debug("Parsed raw protobuf identify response (old format)")
return identify_response
except Exception as e:
logger.error(f"Failed to parse identify response: {e}")
logger.error(f"Response length: {len(response)}")
logger.error(f"Response hex: {response.hex()}")
raise
def identify_handler_for(
host: IHost, use_varint_format: bool = True
) -> StreamHandlerFn:
def identify_handler_for(host: IHost) -> StreamHandlerFn:
async def handle_identify(stream: INetStream) -> None:
# get observed address from ``stream``
peer_id = (
@ -147,21 +100,7 @@ def identify_handler_for(
response = protobuf.SerializeToString()
try:
if use_varint_format:
# Send length-prefixed protobuf message (new format)
await stream.write(varint.encode_uvarint(len(response)))
await stream.write(response)
logger.debug(
"Sent new format (length-prefixed) identify response to %s",
peer_id,
)
else:
# Send raw protobuf message (old format for backward compatibility)
await stream.write(response)
logger.debug(
"Sent old format (raw protobuf) identify response to %s",
peer_id,
)
await stream.write(response)
except StreamClosed:
logger.debug("Fail to respond to %s request: stream closed", ID)
else:

1
libp2p/identity/identify/pb/identify.proto
View File

@ -9,5 +9,4 @@ message Identify {
repeated bytes listen_addrs = 2;
optional bytes observed_addr = 4;
repeated string protocols = 3;
optional bytes signedPeerRecord = 8;
}

4
libp2p/identity/identify/pb/identify_pb2.py
View File

@ -13,7 +13,7 @@ _sym_db = _symbol_database.Default()
DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n*libp2p/identity/identify/pb/identify.proto\x12\x0bidentify.pb\"\xa9\x01\n\x08Identify\x12\x18\n\x10protocol_version\x18\x05 \x01(\t\x12\x15\n\ragent_version\x18\x06 \x01(\t\x12\x12\n\npublic_key\x18\x01 \x01(\x0c\x12\x14\n\x0clisten_addrs\x18\x02 \x03(\x0c\x12\x15\n\robserved_addr\x18\x04 \x01(\x0c\x12\x11\n\tprotocols\x18\x03 \x03(\t\x12\x18\n\x10signedPeerRecord\x18\x08 \x01(\x0c')
DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n*libp2p/identity/identify/pb/identify.proto\x12\x0bidentify.pb\"\x8f\x01\n\x08Identify\x12\x18\n\x10protocol_version\x18\x05 \x01(\t\x12\x15\n\ragent_version\x18\x06 \x01(\t\x12\x12\n\npublic_key\x18\x01 \x01(\x0c\x12\x14\n\x0clisten_addrs\x18\x02 \x03(\x0c\x12\x15\n\robserved_addr\x18\x04 \x01(\x0c\x12\x11\n\tprotocols\x18\x03 \x03(\t')
_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, globals())
_builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'libp2p.identity.identify.pb.identify_pb2', globals())
@ -21,5 +21,5 @@ if _descriptor._USE_C_DESCRIPTORS == False:
DESCRIPTOR._options = None
_IDENTIFY._serialized_start=60
_IDENTIFY._serialized_end=229
_IDENTIFY._serialized_end=203
# @@protoc_insertion_point(module_scope)

7
libp2p/identity/identify/pb/identify_pb2.pyi
View File

@ -22,12 +22,10 @@ class Identify(google.protobuf.message.Message):
LISTEN_ADDRS_FIELD_NUMBER: builtins.int
OBSERVED_ADDR_FIELD_NUMBER: builtins.int
PROTOCOLS_FIELD_NUMBER: builtins.int
SIGNEDPEERRECORD_FIELD_NUMBER: builtins.int
protocol_version: builtins.str
agent_version: builtins.str
public_key: builtins.bytes
observed_addr: builtins.bytes
signedPeerRecord: builtins.bytes
@property
def listen_addrs(self) -> google.protobuf.internal.containers.RepeatedScalarFieldContainer[builtins.bytes]: ...
@property
@ -41,9 +39,8 @@ class Identify(google.protobuf.message.Message):
listen_addrs: collections.abc.Iterable[builtins.bytes] | None = ...,
observed_addr: builtins.bytes | None = ...,
protocols: collections.abc.Iterable[builtins.str] | None = ...,
signedPeerRecord: builtins.bytes | None = ...,
) -> None: ...
def HasField(self, field_name: typing.Literal["agent_version", b"agent_version", "observed_addr", b"observed_addr", "protocol_version", b"protocol_version", "public_key", b"public_key", "signedPeerRecord", b"signedPeerRecord"]) -> builtins.bool: ...
def ClearField(self, field_name: typing.Literal["agent_version", b"agent_version", "listen_addrs", b"listen_addrs", "observed_addr", b"observed_addr", "protocol_version", b"protocol_version", "protocols", b"protocols", "public_key", b"public_key", "signedPeerRecord", b"signedPeerRecord"]) -> None: ...
def HasField(self, field_name: typing.Literal["agent_version", b"agent_version", "observed_addr", b"observed_addr", "protocol_version", b"protocol_version", "public_key", b"public_key"]) -> builtins.bool: ...
def ClearField(self, field_name: typing.Literal["agent_version", b"agent_version", "listen_addrs", b"listen_addrs", "observed_addr", b"observed_addr", "protocol_version", b"protocol_version", "protocols", b"protocols", "public_key", b"public_key"]) -> None: ...
global___Identify = Identify

138
libp2p/identity/identify_push/identify_push.py
View File

@ -20,16 +20,11 @@ from libp2p.custom_types import (
from libp2p.network.stream.exceptions import (
StreamClosed,
)
from libp2p.peer.envelope import consume_envelope
from libp2p.peer.id import (
ID,
)
from libp2p.utils import (
get_agent_version,
varint,
)
from libp2p.utils.varint import (
read_length_prefixed_protobuf,
)
from ..identify.identify import (
@ -45,31 +40,22 @@ logger = logging.getLogger(__name__)
ID_PUSH = TProtocol("/ipfs/id/push/1.0.0")
PROTOCOL_VERSION = "ipfs/0.1.0"
AGENT_VERSION = get_agent_version()
CONCURRENCY_LIMIT = 10
def identify_push_handler_for(
host: IHost, use_varint_format: bool = True
) -> StreamHandlerFn:
def identify_push_handler_for(host: IHost) -> StreamHandlerFn:
"""
Create a handler for the identify/push protocol.
This handler receives pushed identify messages from remote peers and updates
the local peerstore with the new information.
Args:
host: The libp2p host.
use_varint_format: True=length-prefixed, False=raw protobuf.
"""
async def handle_identify_push(stream: INetStream) -> None:
peer_id = stream.muxed_conn.peer_id
try:
# Use the utility function to read the protobuf message
data = await read_length_prefixed_protobuf(stream, use_varint_format)
# Read the identify message from the stream
data = await stream.read()
identify_msg = Identify()
identify_msg.ParseFromString(data)
@ -79,11 +65,6 @@ def identify_push_handler_for(
)
logger.debug("Successfully processed identify/push from peer %s", peer_id)
# Send acknowledgment to indicate successful processing
# This ensures the sender knows the message was received before closing
await stream.write(b"OK")
except StreamClosed:
logger.debug(
"Stream closed while processing identify/push from %s", peer_id
@ -92,10 +73,7 @@ def identify_push_handler_for(
logger.error("Error processing identify/push from %s: %s", peer_id, e)
finally:
# Close the stream after processing
try:
await stream.close()
except Exception:
pass # Ignore errors when closing
await stream.close()
return handle_identify_push
@ -141,19 +119,6 @@ async def _update_peerstore_from_identify(
except Exception as e:
logger.error("Error updating protocols for peer %s: %s", peer_id, e)
if identify_msg.HasField("signedPeerRecord"):
try:
# Convert the signed-peer-record(Envelope) from prtobuf bytes
envelope, _ = consume_envelope(
identify_msg.signedPeerRecord, "libp2p-peer-record"
)
# Use a default TTL of 2 hours (7200 seconds)
if not peerstore.consume_peer_record(envelope, 7200):
logger.error("Updating Certified-Addr-Book was unsuccessful")
except Exception as e:
logger.error(
"Error updating the certified addr book for peer %s: %s", peer_id, e
)
# Update observed address if present
if identify_msg.HasField("observed_addr") and identify_msg.observed_addr:
try:
@ -167,11 +132,7 @@ async def _update_peerstore_from_identify(
async def push_identify_to_peer(
host: IHost,
peer_id: ID,
observed_multiaddr: Multiaddr | None = None,
limit: trio.Semaphore = trio.Semaphore(CONCURRENCY_LIMIT),
use_varint_format: bool = True,
host: IHost, peer_id: ID, observed_multiaddr: Multiaddr | None = None
) -> bool:
"""
Push an identify message to a specific peer.
@ -179,91 +140,52 @@ async def push_identify_to_peer(
This function opens a stream to the peer using the identify/push protocol,
sends the identify message, and closes the stream.
Args:
host: The libp2p host.
peer_id: The peer ID to push to.
observed_multiaddr: The observed multiaddress (optional).
limit: Semaphore for concurrency control.
use_varint_format: True=length-prefixed, False=raw protobuf.
Returns:
bool: True if the push was successful, False otherwise.
Returns
-------
bool
True if the push was successful, False otherwise.
"""
async with limit:
try:
# Create a new stream to the peer using the identify/push protocol
stream = await host.new_stream(peer_id, [ID_PUSH])
try:
# Create a new stream to the peer using the identify/push protocol
stream = await host.new_stream(peer_id, [ID_PUSH])
# Create the identify message
identify_msg = _mk_identify_protobuf(host, observed_multiaddr)
response = identify_msg.SerializeToString()
# Create the identify message
identify_msg = _mk_identify_protobuf(host, observed_multiaddr)
response = identify_msg.SerializeToString()
if use_varint_format:
# Send length-prefixed identify message
await stream.write(varint.encode_uvarint(len(response)))
await stream.write(response)
else:
# Send raw protobuf message
await stream.write(response)
# Send the identify message
await stream.write(response)
# Wait for acknowledgment from the receiver with timeout
# This ensures the message was processed before closing
try:
with trio.move_on_after(1.0): # 1 second timeout
ack = await stream.read(2) # Read "OK" acknowledgment
if ack != b"OK":
logger.warning(
"Unexpected acknowledgment from peer %s: %s", peer_id, ack
)
except Exception as e:
logger.debug("No acknowledgment received from peer %s: %s", peer_id, e)
# Continue anyway, as the message might have been processed
# Close the stream
await stream.close()
# Close the stream after acknowledgment (or timeout)
await stream.close()
logger.debug("Successfully pushed identify to peer %s", peer_id)
return True
except Exception as e:
logger.error("Error pushing identify to peer %s: %s", peer_id, e)
return False
logger.debug("Successfully pushed identify to peer %s", peer_id)
return True
except Exception as e:
logger.error("Error pushing identify to peer %s: %s", peer_id, e)
return False
async def push_identify_to_peers(
host: IHost,
peer_ids: set[ID] | None = None,
observed_multiaddr: Multiaddr | None = None,
use_varint_format: bool = True,
) -> None:
"""
Push an identify message to multiple peers in parallel.
If peer_ids is None, push to all connected peers.
Args:
host: The libp2p host.
peer_ids: Set of peer IDs to push to (if None, push to all connected peers).
observed_multiaddr: The observed multiaddress (optional).
use_varint_format: True=length-prefixed, False=raw protobuf.
"""
if peer_ids is None:
# Get all connected peers
peer_ids = set(host.get_connected_peers())
# Create a single shared semaphore for concurrency control
limit = trio.Semaphore(CONCURRENCY_LIMIT)
peer_ids = set(host.get_peerstore().peer_ids())
# Push to each peer in parallel using a trio.Nursery
# limiting concurrent connections to CONCURRENCY_LIMIT
# TODO: Consider using a bounded nursery to limit concurrency
# and avoid overwhelming the network. This can be done by using
# trio.open_nursery(max_concurrent=10) or similar.
# For now, we will use an unbounded nursery for simplicity.
async with trio.open_nursery() as nursery:
for peer_id in peer_ids:
nursery.start_soon(
push_identify_to_peer,
host,
peer_id,
observed_multiaddr,
limit,
use_varint_format,
)
nursery.start_soon(push_identify_to_peer, host, peer_id, observed_multiaddr)

30
libp2p/kad_dht/__init__.py
View File

@ -1,30 +0,0 @@
"""
Kademlia DHT implementation for py-libp2p.
This module provides a Distributed Hash Table (DHT) implementation
based on the Kademlia protocol.
"""
from .kad_dht import (
KadDHT,
)
from .peer_routing import (
PeerRouting,
)
from .routing_table import (
RoutingTable,
)
from .utils import (
create_key_from_binary,
)
from .value_store import (
ValueStore,
)
__all__ = [
"KadDHT",
"RoutingTable",
"PeerRouting",
"ValueStore",
"create_key_from_binary",
]

14
libp2p/kad_dht/common.py
View File

@ -1,14 +0,0 @@
"""
Shared constants and protocol parameters for the Kademlia DHT.
"""
from libp2p.custom_types import (
TProtocol,
)
# Constants for the Kademlia algorithm
ALPHA = 3 # Concurrency parameter
PROTOCOL_ID = TProtocol("/ipfs/kad/1.0.0")
QUERY_TIMEOUT = 10
TTL = DEFAULT_TTL = 24 * 60 * 60 # 24 hours in seconds

825
libp2p/kad_dht/kad_dht.py
View File

@ -1,825 +0,0 @@
"""
Kademlia DHT implementation for py-libp2p.
This module provides a complete Distributed Hash Table (DHT)
implementation based on the Kademlia algorithm and protocol.
"""
from collections.abc import Awaitable, Callable
from enum import (
Enum,
)
import logging
import time
from multiaddr import (
Multiaddr,
)
import trio
import varint
from libp2p.abc import (
IHost,
)
from libp2p.discovery.random_walk.rt_refresh_manager import RTRefreshManager
from libp2p.kad_dht.utils import maybe_consume_signed_record
from libp2p.network.stream.net_stream import (
INetStream,
)
from libp2p.peer.envelope import Envelope
from libp2p.peer.id import (
ID,
)
from libp2p.peer.peerinfo import (
PeerInfo,
)
from libp2p.peer.peerstore import env_to_send_in_RPC
from libp2p.tools.async_service import (
Service,
)
from .common import (
ALPHA,
PROTOCOL_ID,
QUERY_TIMEOUT,
)
from .pb.kademlia_pb2 import (
Message,
)
from .peer_routing import (
PeerRouting,
)
from .provider_store import (
ProviderStore,
)
from .routing_table import (
RoutingTable,
)
from .value_store import (
ValueStore,
)
logger = logging.getLogger("kademlia-example.kad_dht")
# logger = logging.getLogger("libp2p.kademlia")
# Default parameters
ROUTING_TABLE_REFRESH_INTERVAL = 60 # 1 min in seconds for testing
class DHTMode(Enum):
"""DHT operation modes."""
CLIENT = "CLIENT"
SERVER = "SERVER"
class KadDHT(Service):
"""
Kademlia DHT implementation for libp2p.
This class provides a DHT implementation that combines routing table management,
peer discovery, content routing, and value storage.
Optional Random Walk feature enhances peer discovery by automatically
performing periodic random queries to discover new peers and maintain
routing table health.
Example:
# Basic DHT without random walk (default)
dht = KadDHT(host, DHTMode.SERVER)
# DHT with random walk enabled for enhanced peer discovery
dht = KadDHT(host, DHTMode.SERVER, enable_random_walk=True)
"""
def __init__(self, host: IHost, mode: DHTMode, enable_random_walk: bool = False):
"""
Initialize a new Kademlia DHT node.
:param host: The libp2p host.
:param mode: The mode of host (Client or Server) - must be DHTMode enum
:param enable_random_walk: Whether to enable automatic random walk
"""
super().__init__()
self.host = host
self.local_peer_id = host.get_id()
# Validate that mode is a DHTMode enum
if not isinstance(mode, DHTMode):
raise TypeError(f"mode must be DHTMode enum, got {type(mode)}")
self.mode = mode
self.enable_random_walk = enable_random_walk
# Initialize the routing table
self.routing_table = RoutingTable(self.local_peer_id, self.host)
# Initialize peer routing
self.peer_routing = PeerRouting(host, self.routing_table)
# Initialize value store
self.value_store = ValueStore(host=host, local_peer_id=self.local_peer_id)
# Initialize provider store with host and peer_routing references
self.provider_store = ProviderStore(host=host, peer_routing=self.peer_routing)
# Last time we republished provider records
self._last_provider_republish = time.time()
# Initialize RT Refresh Manager (only if random walk is enabled)
self.rt_refresh_manager: RTRefreshManager | None = None
if self.enable_random_walk:
self.rt_refresh_manager = RTRefreshManager(
host=self.host,
routing_table=self.routing_table,
local_peer_id=self.local_peer_id,
query_function=self._create_query_function(),
enable_auto_refresh=True,
)
# Set protocol handlers
host.set_stream_handler(PROTOCOL_ID, self.handle_stream)
def _create_query_function(self) -> Callable[[bytes], Awaitable[list[ID]]]:
"""
Create a query function that wraps peer_routing.find_closest_peers_network.
This function is used by the RandomWalk module to query for peers without
directly importing PeerRouting, avoiding circular import issues.
Returns:
Callable that takes target_key bytes and returns list of peer IDs
"""
async def query_function(target_key: bytes) -> list[ID]:
"""Query for closest peers to target key."""
return await self.peer_routing.find_closest_peers_network(target_key)
return query_function
async def run(self) -> None:
"""Run the DHT service."""
logger.info(f"Starting Kademlia DHT with peer ID {self.local_peer_id}")
# Start the RT Refresh Manager in parallel with the main DHT service
async with trio.open_nursery() as nursery:
# Start the RT Refresh Manager only if random walk is enabled
if self.rt_refresh_manager is not None:
nursery.start_soon(self.rt_refresh_manager.start)
logger.info("RT Refresh Manager started - Random Walk is now active")
else:
logger.info("Random Walk is disabled - RT Refresh Manager not started")
# Start the main DHT service loop
nursery.start_soon(self._run_main_loop)
async def _run_main_loop(self) -> None:
"""Run the main DHT service loop."""
# Main service loop
while self.manager.is_running:
# Periodically refresh the routing table
await self.refresh_routing_table()
# Check if it's time to republish provider records
current_time = time.time()
# await self._republish_provider_records()
self._last_provider_republish = current_time
# Clean up expired values and provider records
expired_values = self.value_store.cleanup_expired()
if expired_values > 0:
logger.debug(f"Cleaned up {expired_values} expired values")
self.provider_store.cleanup_expired()
# Wait before next maintenance cycle
await trio.sleep(ROUTING_TABLE_REFRESH_INTERVAL)
async def stop(self) -> None:
"""Stop the DHT service and cleanup resources."""
logger.info("Stopping Kademlia DHT")
# Stop the RT Refresh Manager only if it was started
if self.rt_refresh_manager is not None:
await self.rt_refresh_manager.stop()
logger.info("RT Refresh Manager stopped")
else:
logger.info("RT Refresh Manager was not running (Random Walk disabled)")
async def switch_mode(self, new_mode: DHTMode) -> DHTMode:
"""
Switch the DHT mode.
:param new_mode: The new mode - must be DHTMode enum
:return: The new mode as DHTMode enum
"""
# Validate that new_mode is a DHTMode enum
if not isinstance(new_mode, DHTMode):
raise TypeError(f"new_mode must be DHTMode enum, got {type(new_mode)}")
if new_mode == DHTMode.CLIENT:
self.routing_table.cleanup_routing_table()
self.mode = new_mode
logger.info(f"Switched to {new_mode.value} mode")
return self.mode
async def handle_stream(self, stream: INetStream) -> None:
"""
Handle an incoming DHT stream using varint length prefixes.
"""
if self.mode == DHTMode.CLIENT:
stream.close
return
peer_id = stream.muxed_conn.peer_id
logger.debug(f"Received DHT stream from peer {peer_id}")
await self.add_peer(peer_id)
logger.debug(f"Added peer {peer_id} to routing table")
closer_peer_envelope: Envelope | None = None
provider_peer_envelope: Envelope | None = None
try:
# Read varint-prefixed length for the message
length_prefix = b""
while True:
byte = await stream.read(1)
if not byte:
logger.warning("Stream closed while reading varint length")
await stream.close()
return
length_prefix += byte
if byte[0] & 0x80 == 0:
break
msg_length = varint.decode_bytes(length_prefix)
# Read the message bytes
msg_bytes = await stream.read(msg_length)
if len(msg_bytes) < msg_length:
logger.warning("Failed to read full message from stream")
await stream.close()
return
try:
# Parse as protobuf
message = Message()
message.ParseFromString(msg_bytes)
logger.debug(
f"Received DHT message from {peer_id}, type: {message.type}"
)
# Handle FIND_NODE message
if message.type == Message.MessageType.FIND_NODE:
# Get target key directly from protobuf
target_key = message.key
# Find closest peers to the target key
closest_peers = self.routing_table.find_local_closest_peers(
target_key, 20
)
logger.debug(f"Found {len(closest_peers)} peers close to target")
# Consume the source signed_peer_record if sent
if not maybe_consume_signed_record(message, self.host, peer_id):
logger.error(
"Received an invalid-signed-record, dropping the stream"
)
await stream.close()
return
# Build response message with protobuf
response = Message()
response.type = Message.MessageType.FIND_NODE
# Add closest peers to response
for peer in closest_peers:
# Skip if the peer is the requester
if peer == peer_id:
continue
# Add peer to closerPeers field
peer_proto = response.closerPeers.add()
peer_proto.id = peer.to_bytes()
peer_proto.connection = Message.ConnectionType.CAN_CONNECT
# Add addresses if available
try:
addrs = self.host.get_peerstore().addrs(peer)
if addrs:
for addr in addrs:
peer_proto.addrs.append(addr.to_bytes())
except Exception:
pass
# Add the signed-peer-record for each peer in the peer-proto
# if cached in the peerstore
closer_peer_envelope = (
self.host.get_peerstore().get_peer_record(peer)
)
if closer_peer_envelope is not None:
peer_proto.signedRecord = (
closer_peer_envelope.marshal_envelope()
)
# Create sender_signed_peer_record
envelope_bytes, _ = env_to_send_in_RPC(self.host)
response.senderRecord = envelope_bytes
# Serialize and send response
response_bytes = response.SerializeToString()
await stream.write(varint.encode(len(response_bytes)))
await stream.write(response_bytes)
logger.debug(
f"Sent FIND_NODE response with{len(response.closerPeers)} peers"
)
# Handle ADD_PROVIDER message
elif message.type == Message.MessageType.ADD_PROVIDER:
# Process ADD_PROVIDER
key = message.key
logger.debug(f"Received ADD_PROVIDER for key {key.hex()}")
# Consume the source signed-peer-record if sent
if not maybe_consume_signed_record(message, self.host, peer_id):
logger.error(
"Received an invalid-signed-record, dropping the stream"
)
await stream.close()
return
# Extract provider information
for provider_proto in message.providerPeers:
try:
# Validate that the provider is the sender
provider_id = ID(provider_proto.id)
if provider_id != peer_id:
logger.warning(
f"Provider ID {provider_id} doesn't"
f"match sender {peer_id}, ignoring"
)
continue
# Convert addresses to Multiaddr
addrs = []
for addr_bytes in provider_proto.addrs:
try:
addrs.append(Multiaddr(addr_bytes))
except Exception as e:
logger.warning(f"Failed to parse address: {e}")
# Add to provider store
provider_info = PeerInfo(provider_id, addrs)
self.provider_store.add_provider(key, provider_info)
logger.debug(
f"Added provider {provider_id} for key {key.hex()}"
)
# Process the signed-records of provider if sent
if not maybe_consume_signed_record(
provider_proto, self.host
):
logger.error(
"Received an invalid-signed-record,"
"dropping the stream"
)
await stream.close()
return
except Exception as e:
logger.warning(f"Failed to process provider info: {e}")
# Send acknowledgement
response = Message()
response.type = Message.MessageType.ADD_PROVIDER
response.key = key
# Add sender's signed-peer-record
envelope_bytes, _ = env_to_send_in_RPC(self.host)
response.senderRecord = envelope_bytes
response_bytes = response.SerializeToString()
await stream.write(varint.encode(len(response_bytes)))
await stream.write(response_bytes)
logger.debug("Sent ADD_PROVIDER acknowledgement")
# Handle GET_PROVIDERS message
elif message.type == Message.MessageType.GET_PROVIDERS:
# Process GET_PROVIDERS
key = message.key
logger.debug(f"Received GET_PROVIDERS request for key {key.hex()}")
# Consume the source signed_peer_record if sent
if not maybe_consume_signed_record(message, self.host, peer_id):
logger.error(
"Received an invalid-signed-record, dropping the stream"
)
await stream.close()
return
# Find providers for the key
providers = self.provider_store.get_providers(key)
logger.debug(
f"Found {len(providers)} providers for key {key.hex()}"
)
# Create response
response = Message()
response.type = Message.MessageType.GET_PROVIDERS
response.key = key
# Create sender_signed_peer_record for the response
envelope_bytes, _ = env_to_send_in_RPC(self.host)
response.senderRecord = envelope_bytes
# Add provider information to response
for provider_info in providers:
provider_proto = response.providerPeers.add()
provider_proto.id = provider_info.peer_id.to_bytes()
provider_proto.connection = Message.ConnectionType.CAN_CONNECT
# Add provider signed-records if cached
provider_peer_envelope = (
self.host.get_peerstore().get_peer_record(
provider_info.peer_id
)
)
if provider_peer_envelope is not None:
provider_proto.signedRecord = (
provider_peer_envelope.marshal_envelope()
)
# Add addresses if available
for addr in provider_info.addrs:
provider_proto.addrs.append(addr.to_bytes())
# Also include closest peers if we don't have providers
if not providers:
closest_peers = self.routing_table.find_local_closest_peers(
key, 20
)
logger.debug(
f"No providers found, including {len(closest_peers)}"
"closest peers"
)
for peer in closest_peers:
# Skip if peer is the requester
if peer == peer_id:
continue
peer_proto = response.closerPeers.add()
peer_proto.id = peer.to_bytes()
peer_proto.connection = Message.ConnectionType.CAN_CONNECT
# Add the signed-records of closest_peers if cached
closer_peer_envelope = (
self.host.get_peerstore().get_peer_record(peer)
)
if closer_peer_envelope is not None:
peer_proto.signedRecord = (
closer_peer_envelope.marshal_envelope()
)
# Add addresses if available
try:
addrs = self.host.get_peerstore().addrs(peer)
for addr in addrs:
peer_proto.addrs.append(addr.to_bytes())
except Exception:
pass
# Serialize and send response
response_bytes = response.SerializeToString()
await stream.write(varint.encode(len(response_bytes)))
await stream.write(response_bytes)
logger.debug("Sent GET_PROVIDERS response")
# Handle GET_VALUE message
elif message.type == Message.MessageType.GET_VALUE:
# Process GET_VALUE
key = message.key
logger.debug(f"Received GET_VALUE request for key {key.hex()}")
# Consume the sender_signed_peer_record
if not maybe_consume_signed_record(message, self.host, peer_id):
logger.error(
"Received an invalid-signed-record, dropping the stream"
)
await stream.close()
return
value = self.value_store.get(key)
if value:
logger.debug(f"Found value for key {key.hex()}")
# Create response using protobuf
response = Message()
response.type = Message.MessageType.GET_VALUE
# Create record
response.key = key
response.record.key = key
response.record.value = value
response.record.timeReceived = str(time.time())
# Create sender_signed_peer_record
envelope_bytes, _ = env_to_send_in_RPC(self.host)
response.senderRecord = envelope_bytes
# Serialize and send response
response_bytes = response.SerializeToString()
await stream.write(varint.encode(len(response_bytes)))
await stream.write(response_bytes)
logger.debug("Sent GET_VALUE response")
else:
logger.debug(f"No value found for key {key.hex()}")
# Create response with closest peers when no value is found
response = Message()
response.type = Message.MessageType.GET_VALUE
response.key = key
# Create sender_signed_peer_record for the response
envelope_bytes, _ = env_to_send_in_RPC(self.host)
response.senderRecord = envelope_bytes
# Add closest peers to key
closest_peers = self.routing_table.find_local_closest_peers(
key, 20
)
logger.debug(
"No value found,"
f"including {len(closest_peers)} closest peers"
)
for peer in closest_peers:
# Skip if peer is the requester
if peer == peer_id:
continue
peer_proto = response.closerPeers.add()
peer_proto.id = peer.to_bytes()
peer_proto.connection = Message.ConnectionType.CAN_CONNECT
# Add signed-records of closer-peers if cached
closer_peer_envelope = (
self.host.get_peerstore().get_peer_record(peer)
)
if closer_peer_envelope is not None:
peer_proto.signedRecord = (
closer_peer_envelope.marshal_envelope()
)
# Add addresses if available
try:
addrs = self.host.get_peerstore().addrs(peer)
for addr in addrs:
peer_proto.addrs.append(addr.to_bytes())
except Exception:
pass
# Serialize and send response
response_bytes = response.SerializeToString()
await stream.write(varint.encode(len(response_bytes)))
await stream.write(response_bytes)
logger.debug("Sent GET_VALUE response with closest peers")
# Handle PUT_VALUE message
elif message.type == Message.MessageType.PUT_VALUE and message.HasField(
"record"
):
# Process PUT_VALUE
key = message.record.key
value = message.record.value
success = False
# Consume the source signed_peer_record if sent
if not maybe_consume_signed_record(message, self.host, peer_id):
logger.error(
"Received an invalid-signed-record, dropping the stream"
)
await stream.close()
return
try:
if not (key and value):
raise ValueError(
"Missing key or value in PUT_VALUE message"
)
self.value_store.put(key, value)
logger.debug(f"Stored value {value.hex()} for key {key.hex()}")
success = True
except Exception as e:
logger.warning(
f"Failed to store value {value.hex()} for key "
f"{key.hex()}: {e}"
)
finally:
# Send acknowledgement
response = Message()
response.type = Message.MessageType.PUT_VALUE
if success:
response.key = key
# Create sender_signed_peer_record for the response
envelope_bytes, _ = env_to_send_in_RPC(self.host)
response.senderRecord = envelope_bytes
# Serialize and send response
response_bytes = response.SerializeToString()
await stream.write(varint.encode(len(response_bytes)))
await stream.write(response_bytes)
logger.debug("Sent PUT_VALUE acknowledgement")
except Exception as proto_err:
logger.warning(f"Failed to parse protobuf message: {proto_err}")
await stream.close()
except Exception as e:
logger.error(f"Error handling DHT stream: {e}")
await stream.close()
async def refresh_routing_table(self) -> None:
"""Refresh the routing table."""
logger.debug("Refreshing routing table")
await self.peer_routing.refresh_routing_table()
# Peer routing methods
async def find_peer(self, peer_id: ID) -> PeerInfo | None:
"""
Find a peer with the given ID.
"""
logger.debug(f"Finding peer: {peer_id}")
return await self.peer_routing.find_peer(peer_id)
# Value storage and retrieval methods
async def put_value(self, key: bytes, value: bytes) -> None:
"""
Store a value in the DHT.
"""
logger.debug(f"Storing value for key {key.hex()}")
# 1. Store locally first
self.value_store.put(key, value)
try:
decoded_value = value.decode("utf-8")
except UnicodeDecodeError:
decoded_value = value.hex()
logger.debug(
f"Stored value locally for key {key.hex()} with value {decoded_value}"
)
# 2. Get closest peers, excluding self
closest_peers = [
peer
for peer in self.routing_table.find_local_closest_peers(key)
if peer != self.local_peer_id
]
logger.debug(f"Found {len(closest_peers)} peers to store value at")
# 3. Store at remote peers in batches of ALPHA, in parallel
stored_count = 0
for i in range(0, len(closest_peers), ALPHA):
batch = closest_peers[i : i + ALPHA]
batch_results = [False] * len(batch)
async def store_one(idx: int, peer: ID) -> None:
try:
with trio.move_on_after(QUERY_TIMEOUT):
success = await self.value_store._store_at_peer(
peer, key, value
)
batch_results[idx] = success
if success:
logger.debug(f"Stored value at peer {peer}")
else:
logger.debug(f"Failed to store value at peer {peer}")
except Exception as e:
logger.debug(f"Error storing value at peer {peer}: {e}")
async with trio.open_nursery() as nursery:
for idx, peer in enumerate(batch):
nursery.start_soon(store_one, idx, peer)
stored_count += sum(batch_results)
logger.info(f"Successfully stored value at {stored_count} peers")
async def get_value(self, key: bytes) -> bytes | None:
logger.debug(f"Getting value for key: {key.hex()}")
# 1. Check local store first
value = self.value_store.get(key)
if value:
logger.debug("Found value locally")
return value
# 2. Get closest peers, excluding self
closest_peers = [
peer
for peer in self.routing_table.find_local_closest_peers(key)
if peer != self.local_peer_id
]
logger.debug(f"Searching {len(closest_peers)} peers for value")
# 3. Query ALPHA peers at a time in parallel
for i in range(0, len(closest_peers), ALPHA):
batch = closest_peers[i : i + ALPHA]
found_value = None
async def query_one(peer: ID) -> None:
nonlocal found_value
try:
with trio.move_on_after(QUERY_TIMEOUT):
value = await self.value_store._get_from_peer(peer, key)
if value is not None and found_value is None:
found_value = value
logger.debug(f"Found value at peer {peer}")
except Exception as e:
logger.debug(f"Error querying peer {peer}: {e}")
async with trio.open_nursery() as nursery:
for peer in batch:
nursery.start_soon(query_one, peer)
if found_value is not None:
self.value_store.put(key, found_value)
logger.info("Successfully retrieved value from network")
return found_value
# 4. Not found
logger.warning(f"Value not found for key {key.hex()}")
return None
# Add these methods in the Utility methods section
# Utility methods
async def add_peer(self, peer_id: ID) -> bool:
"""
Add a peer to the routing table.
params: peer_id: The peer ID to add.
Returns
-------
bool
True if peer was added or updated, False otherwise.
"""
return await self.routing_table.add_peer(peer_id)
async def provide(self, key: bytes) -> bool:
"""
Reference to provider_store.provide for convenience.
"""
return await self.provider_store.provide(key)
async def find_providers(self, key: bytes, count: int = 20) -> list[PeerInfo]:
"""
Reference to provider_store.find_providers for convenience.
"""
return await self.provider_store.find_providers(key, count)
def get_routing_table_size(self) -> int:
"""
Get the number of peers in the routing table.
Returns
-------
int
Number of peers.
"""
return self.routing_table.size()
def get_value_store_size(self) -> int:
"""
Get the number of items in the value store.
Returns
-------
int
Number of items.
"""
return self.value_store.size()
def is_random_walk_enabled(self) -> bool:
"""
Check if random walk peer discovery is enabled.
Returns
-------
bool
True if random walk is enabled, False otherwise.
"""
return self.enable_random_walk

0
libp2p/kad_dht/pb/__init__.py
View File

41
libp2p/kad_dht/pb/kademlia.proto
View File

@ -1,41 +0,0 @@
syntax = "proto3";
message Record {
bytes key = 1;
bytes value = 2;
string timeReceived = 5;
};
message Message {
enum MessageType {
PUT_VALUE = 0;
GET_VALUE = 1;
ADD_PROVIDER = 2;
GET_PROVIDERS = 3;
FIND_NODE = 4;
PING = 5;
}
enum ConnectionType {
NOT_CONNECTED = 0;
CONNECTED = 1;
CAN_CONNECT = 2;
CANNOT_CONNECT = 3;
}
message Peer {
bytes id = 1;
repeated bytes addrs = 2;
ConnectionType connection = 3;
optional bytes signedRecord = 4; // Envelope(PeerRecord) encoded
}
MessageType type = 1;
int32 clusterLevelRaw = 10;
bytes key = 2;
Record record = 3;
repeated Peer closerPeers = 8;
repeated Peer providerPeers = 9;
optional bytes senderRecord = 11; // Envelope(PeerRecord) encoded
}

34
libp2p/kad_dht/pb/kademlia_pb2.py
View File

@ -1,34 +0,0 @@
# -*- coding: utf-8 -*-
# Generated by the protocol buffer compiler. DO NOT EDIT!
# source: libp2p/kad_dht/pb/kademlia.proto
# Protobuf Python Version: 4.25.3
"""Generated protocol buffer code."""
from google.protobuf import descriptor as _descriptor
from google.protobuf import descriptor_pool as _descriptor_pool
from google.protobuf import symbol_database as _symbol_database
from google.protobuf.internal import builder as _builder
# @@protoc_insertion_point(imports)
_sym_db = _symbol_database.Default()
DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n libp2p/kad_dht/pb/kademlia.proto\":\n\x06Record\x12\x0b\n\x03key\x18\x01 \x01(\x0c\x12\r\n\x05value\x18\x02 \x01(\x0c\x12\x14\n\x0ctimeReceived\x18\x05 \x01(\t\"\xa2\x04\n\x07Message\x12\"\n\x04type\x18\x01 \x01(\x0e\x32\x14.Message.MessageType\x12\x17\n\x0f\x63lusterLevelRaw\x18\n \x01(\x05\x12\x0b\n\x03key\x18\x02 \x01(\x0c\x12\x17\n\x06record\x18\x03 \x01(\x0b\x32\x07.Record\x12\"\n\x0b\x63loserPeers\x18\x08 \x03(\x0b\x32\r.Message.Peer\x12$\n\rproviderPeers\x18\t \x03(\x0b\x32\r.Message.Peer\x12\x19\n\x0csenderRecord\x18\x0b \x01(\x0cH\x00\x88\x01\x01\x1az\n\x04Peer\x12\n\n\x02id\x18\x01 \x01(\x0c\x12\r\n\x05\x61\x64\x64rs\x18\x02 \x03(\x0c\x12+\n\nconnection\x18\x03 \x01(\x0e\x32\x17.Message.ConnectionType\x12\x19\n\x0csignedRecord\x18\x04 \x01(\x0cH\x00\x88\x01\x01\x42\x0f\n\r_signedRecord\"i\n\x0bMessageType\x12\r\n\tPUT_VALUE\x10\x00\x12\r\n\tGET_VALUE\x10\x01\x12\x10\n\x0c\x41\x44\x44_PROVIDER\x10\x02\x12\x11\n\rGET_PROVIDERS\x10\x03\x12\r\n\tFIND_NODE\x10\x04\x12\x08\n\x04PING\x10\x05\"W\n\x0e\x43onnectionType\x12\x11\n\rNOT_CONNECTED\x10\x00\x12\r\n\tCONNECTED\x10\x01\x12\x0f\n\x0b\x43\x41N_CONNECT\x10\x02\x12\x12\n\x0e\x43\x41NNOT_CONNECT\x10\x03\x42\x0f\n\r_senderRecordb\x06proto3')
_globals = globals()
_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, _globals)
_builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'libp2p.kad_dht.pb.kademlia_pb2', _globals)
if _descriptor._USE_C_DESCRIPTORS == False:
DESCRIPTOR._options = None
_globals['_RECORD']._serialized_start=36
_globals['_RECORD']._serialized_end=94
_globals['_MESSAGE']._serialized_start=97
_globals['_MESSAGE']._serialized_end=643
_globals['_MESSAGE_PEER']._serialized_start=308
_globals['_MESSAGE_PEER']._serialized_end=430
_globals['_MESSAGE_MESSAGETYPE']._serialized_start=432
_globals['_MESSAGE_MESSAGETYPE']._serialized_end=537
_globals['_MESSAGE_CONNECTIONTYPE']._serialized_start=539
_globals['_MESSAGE_CONNECTIONTYPE']._serialized_end=626
# @@protoc_insertion_point(module_scope)

70
libp2p/kad_dht/pb/kademlia_pb2.pyi
View File

@ -1,70 +0,0 @@
from google.protobuf.internal import containers as _containers
from google.protobuf.internal import enum_type_wrapper as _enum_type_wrapper
from google.protobuf import descriptor as _descriptor
from google.protobuf import message as _message
from typing import ClassVar as _ClassVar, Iterable as _Iterable, Mapping as _Mapping, Optional as _Optional, Union as _Union
DESCRIPTOR: _descriptor.FileDescriptor
class Record(_message.Message):
__slots__ = ("key", "value", "timeReceived")
KEY_FIELD_NUMBER: _ClassVar[int]
VALUE_FIELD_NUMBER: _ClassVar[int]
TIMERECEIVED_FIELD_NUMBER: _ClassVar[int]
key: bytes
value: bytes
timeReceived: str
def __init__(self, key: _Optional[bytes] = ..., value: _Optional[bytes] = ..., timeReceived: _Optional[str] = ...) -> None: ...
class Message(_message.Message):
__slots__ = ("type", "clusterLevelRaw", "key", "record", "closerPeers", "providerPeers", "senderRecord")
class MessageType(int, metaclass=_enum_type_wrapper.EnumTypeWrapper):
__slots__ = ()
PUT_VALUE: _ClassVar[Message.MessageType]
GET_VALUE: _ClassVar[Message.MessageType]
ADD_PROVIDER: _ClassVar[Message.MessageType]
GET_PROVIDERS: _ClassVar[Message.MessageType]
FIND_NODE: _ClassVar[Message.MessageType]
PING: _ClassVar[Message.MessageType]
PUT_VALUE: Message.MessageType
GET_VALUE: Message.MessageType
ADD_PROVIDER: Message.MessageType
GET_PROVIDERS: Message.MessageType
FIND_NODE: Message.MessageType
PING: Message.MessageType
class ConnectionType(int, metaclass=_enum_type_wrapper.EnumTypeWrapper):
__slots__ = ()
NOT_CONNECTED: _ClassVar[Message.ConnectionType]
CONNECTED: _ClassVar[Message.ConnectionType]
CAN_CONNECT: _ClassVar[Message.ConnectionType]
CANNOT_CONNECT: _ClassVar[Message.ConnectionType]
NOT_CONNECTED: Message.ConnectionType
CONNECTED: Message.ConnectionType
CAN_CONNECT: Message.ConnectionType
CANNOT_CONNECT: Message.ConnectionType
class Peer(_message.Message):
__slots__ = ("id", "addrs", "connection", "signedRecord")
ID_FIELD_NUMBER: _ClassVar[int]
ADDRS_FIELD_NUMBER: _ClassVar[int]
CONNECTION_FIELD_NUMBER: _ClassVar[int]
SIGNEDRECORD_FIELD_NUMBER: _ClassVar[int]
id: bytes
addrs: _containers.RepeatedScalarFieldContainer[bytes]
connection: Message.ConnectionType
signedRecord: bytes
def __init__(self, id: _Optional[bytes] = ..., addrs: _Optional[_Iterable[bytes]] = ..., connection: _Optional[_Union[Message.ConnectionType, str]] = ..., signedRecord: _Optional[bytes] = ...) -> None: ...
TYPE_FIELD_NUMBER: _ClassVar[int]
CLUSTERLEVELRAW_FIELD_NUMBER: _ClassVar[int]
KEY_FIELD_NUMBER: _ClassVar[int]
RECORD_FIELD_NUMBER: _ClassVar[int]
CLOSERPEERS_FIELD_NUMBER: _ClassVar[int]
PROVIDERPEERS_FIELD_NUMBER: _ClassVar[int]
SENDERRECORD_FIELD_NUMBER: _ClassVar[int]
type: Message.MessageType
clusterLevelRaw: int
key: bytes
record: Record
closerPeers: _containers.RepeatedCompositeFieldContainer[Message.Peer]
providerPeers: _containers.RepeatedCompositeFieldContainer[Message.Peer]
senderRecord: bytes
def __init__(self, type: _Optional[_Union[Message.MessageType, str]] = ..., clusterLevelRaw: _Optional[int] = ..., key: _Optional[bytes] = ..., record: _Optional[_Union[Record, _Mapping]] = ..., closerPeers: _Optional[_Iterable[_Union[Message.Peer, _Mapping]]] = ..., providerPeers: _Optional[_Iterable[_Union[Message.Peer, _Mapping]]] = ..., senderRecord: _Optional[bytes] = ...) -> None: ... # type: ignore

460
libp2p/kad_dht/peer_routing.py
View File

@ -1,460 +0,0 @@
"""
Peer routing implementation for Kademlia DHT.
This module implements the peer routing interface using Kademlia's algorithm
to efficiently locate peers in a distributed network.
"""
import logging
import trio
import varint
from libp2p.abc import (
IHost,
INetStream,
IPeerRouting,
)
from libp2p.peer.envelope import Envelope
from libp2p.peer.id import (
ID,
)
from libp2p.peer.peerinfo import (
PeerInfo,
)
from libp2p.peer.peerstore import env_to_send_in_RPC
from .common import (
ALPHA,
PROTOCOL_ID,
)
from .pb.kademlia_pb2 import (
Message,
)
from .routing_table import (
RoutingTable,
)
from .utils import (
maybe_consume_signed_record,
sort_peer_ids_by_distance,
)
# logger = logging.getLogger("libp2p.kademlia.peer_routing")
logger = logging.getLogger("kademlia-example.peer_routing")
MAX_PEER_LOOKUP_ROUNDS = 20 # Maximum number of rounds in peer lookup
class PeerRouting(IPeerRouting):
"""
Implementation of peer routing using the Kademlia algorithm.
This class provides methods to find peers in the DHT network
and helps maintain the routing table.
"""
def __init__(self, host: IHost, routing_table: RoutingTable):
"""
Initialize the peer routing service.
:param host: The libp2p host
:param routing_table: The Kademlia routing table
"""
self.host = host
self.routing_table = routing_table
async def find_peer(self, peer_id: ID) -> PeerInfo | None:
"""
Find a peer with the given ID.
:param peer_id: The ID of the peer to find
Returns
-------
Optional[PeerInfo]
The peer information if found, None otherwise
"""
# Check if this is actually our peer ID
if peer_id == self.host.get_id():
try:
# Return our own peer info
return PeerInfo(peer_id, self.host.get_addrs())
except Exception:
logger.exception("Error getting our own peer info")
return None
# First check if the peer is in our routing table
peer_info = self.routing_table.get_peer_info(peer_id)
if peer_info:
logger.debug(f"Found peer {peer_id} in routing table")
return peer_info
# Then check if the peer is in our peerstore
try:
addrs = self.host.get_peerstore().addrs(peer_id)
if addrs:
logger.debug(f"Found peer {peer_id} in peerstore")
return PeerInfo(peer_id, addrs)
except Exception:
pass
# If not found locally, search the network
try:
closest_peers = await self.find_closest_peers_network(peer_id.to_bytes())
logger.info(f"Closest peers found: {closest_peers}")
# Check if we found the peer we're looking for
for found_peer in closest_peers:
if found_peer == peer_id:
try:
addrs = self.host.get_peerstore().addrs(found_peer)
if addrs:
return PeerInfo(found_peer, addrs)
except Exception:
pass
except Exception as e:
logger.error(f"Error searching for peer {peer_id}: {e}")
# Not found
logger.info(f"Peer {peer_id} not found")
return None
async def _query_single_peer_for_closest(
self, peer: ID, target_key: bytes, new_peers: list[ID]
) -> None:
"""
Query a single peer for closest peers and append results to the shared list.
params: peer : ID
The peer to query
params: target_key : bytes
The target key to find closest peers for
params: new_peers : list[ID]
Shared list to append results to
"""
try:
result = await self._query_peer_for_closest(peer, target_key)
# Add deduplication to prevent duplicate peers
for peer_id in result:
if peer_id not in new_peers:
new_peers.append(peer_id)
logger.debug(
"Queried peer %s for closest peers, got %d results (%d unique)",
peer,
len(result),
len([p for p in result if p not in new_peers[: -len(result)]]),
)
except Exception as e:
logger.debug(f"Query to peer {peer} failed: {e}")
async def find_closest_peers_network(
self, target_key: bytes, count: int = 20
) -> list[ID]:
"""
Find the closest peers to a target key in the entire network.
Performs an iterative lookup by querying peers for their closest peers.
Returns
-------
list[ID]
Closest peer IDs
"""
# Start with closest peers from our routing table
closest_peers = self.routing_table.find_local_closest_peers(target_key, count)
logger.debug("Local closest peers: %d found", len(closest_peers))
queried_peers: set[ID] = set()
rounds = 0
# Return early if we have no peers to start with
if not closest_peers:
logger.debug("No local peers available for network lookup")
return []
# Iterative lookup until convergence
while rounds < MAX_PEER_LOOKUP_ROUNDS:
rounds += 1
logger.debug(f"Lookup round {rounds}/{MAX_PEER_LOOKUP_ROUNDS}")
# Find peers we haven't queried yet
peers_to_query = [p for p in closest_peers if p not in queried_peers]
if not peers_to_query:
logger.debug("No more unqueried peers available, ending lookup")
break # No more peers to query
# Query these peers for their closest peers to target
peers_batch = peers_to_query[:ALPHA] # Limit to ALPHA peers at a time
# Mark these peers as queried before we actually query them
for peer in peers_batch:
queried_peers.add(peer)
# Run queries in parallel for this batch using trio nursery
new_peers: list[ID] = [] # Shared array to collect all results
async with trio.open_nursery() as nursery:
for peer in peers_batch:
nursery.start_soon(
self._query_single_peer_for_closest, peer, target_key, new_peers
)
# If we got no new peers, we're done
if not new_peers:
logger.debug("No new peers discovered in this round, ending lookup")
break
# Update our list of closest peers
all_candidates = closest_peers + new_peers
old_closest_peers = closest_peers[:]
closest_peers = sort_peer_ids_by_distance(target_key, all_candidates)[
:count
]
logger.debug(f"Updated closest peers count: {len(closest_peers)}")
# Check if we made any progress (found closer peers)
if closest_peers == old_closest_peers:
logger.debug("No improvement in closest peers, ending lookup")
break
logger.info(
f"Network lookup completed after {rounds} rounds, "
f"found {len(closest_peers)} peers"
)
return closest_peers
async def _query_peer_for_closest(self, peer: ID, target_key: bytes) -> list[ID]:
"""
Query a peer for their closest peers
to the target key using varint length prefix
"""
stream = None
results = []
try:
# Add the peer to our routing table regardless of query outcome
try:
addrs = self.host.get_peerstore().addrs(peer)
if addrs:
peer_info = PeerInfo(peer, addrs)
await self.routing_table.add_peer(peer_info)
except Exception as e:
logger.debug(f"Failed to add peer {peer} to routing table: {e}")
# Open a stream to the peer using the Kademlia protocol
logger.debug(f"Opening stream to {peer} for closest peers query")
try:
stream = await self.host.new_stream(peer, [PROTOCOL_ID])
logger.debug(f"Stream opened to {peer}")
except Exception as e:
logger.warning(f"Failed to open stream to {peer}: {e}")
return []
# Create and send FIND_NODE request using protobuf
find_node_msg = Message()
find_node_msg.type = Message.MessageType.FIND_NODE
find_node_msg.key = target_key # Set target key directly as bytes
# Create sender_signed_peer_record
envelope_bytes, _ = env_to_send_in_RPC(self.host)
find_node_msg.senderRecord = envelope_bytes
# Serialize and send the protobuf message with varint length prefix
proto_bytes = find_node_msg.SerializeToString()
logger.debug(
f"Sending FIND_NODE: {proto_bytes.hex()} (len={len(proto_bytes)})"
)
await stream.write(varint.encode(len(proto_bytes)))
await stream.write(proto_bytes)
# Read varint-prefixed response length
length_bytes = b""
while True:
b = await stream.read(1)
if not b:
logger.warning(
"Error reading varint length from stream: connection closed"
)
return []
length_bytes += b
if b[0] & 0x80 == 0:
break
response_length = varint.decode_bytes(length_bytes)
# Read response data
response_bytes = b""
remaining = response_length
while remaining > 0:
chunk = await stream.read(remaining)
if not chunk:
logger.debug(f"Connection closed by peer {peer} while reading data")
return []
response_bytes += chunk
remaining -= len(chunk)
# Parse the protobuf response
response_msg = Message()
response_msg.ParseFromString(response_bytes)
logger.debug(
"Received response from %s with %d peers",
peer,
len(response_msg.closerPeers),
)
# Process closest peers from response
if response_msg.type == Message.MessageType.FIND_NODE:
# Consume the sender_signed_peer_record
if not maybe_consume_signed_record(response_msg, self.host, peer):
logger.error(
"Received an invalid-signed-record,ignoring the response"
)
return []
for peer_data in response_msg.closerPeers:
# Consume the received closer_peers signed-records, peer-id is
# sent with the peer-data
if not maybe_consume_signed_record(peer_data, self.host):
logger.error(
"Received an invalid-signed-record,ignoring the response"
)
return []
new_peer_id = ID(peer_data.id)
if new_peer_id not in results:
results.append(new_peer_id)
if peer_data.addrs:
from multiaddr import (
Multiaddr,
)
addrs = [Multiaddr(addr) for addr in peer_data.addrs]
self.host.get_peerstore().add_addrs(new_peer_id, addrs, 3600)
except Exception as e:
logger.debug(f"Error querying peer {peer} for closest: {e}")
finally:
if stream:
await stream.close()
return results
async def _handle_kad_stream(self, stream: INetStream) -> None:
"""
Handle incoming Kademlia protocol streams.
params: stream: The incoming stream
Returns
-------
None
"""
try:
# Read message length
peer_id = stream.muxed_conn.peer_id
length_bytes = await stream.read(4)
if not length_bytes:
return
message_length = int.from_bytes(length_bytes, byteorder="big")
# Read message
message_bytes = await stream.read(message_length)
if not message_bytes:
return
# Parse protobuf message
kad_message = Message()
closer_peer_envelope: Envelope | None = None
try:
kad_message.ParseFromString(message_bytes)
if kad_message.type == Message.MessageType.FIND_NODE:
# Consume the sender's signed-peer-record if sent
if not maybe_consume_signed_record(kad_message, self.host, peer_id):
logger.error(
"Received an invalid-signed-record, dropping the stream"
)
return
# Get target key directly from protobuf message
target_key = kad_message.key
# Find closest peers to target
closest_peers = self.routing_table.find_local_closest_peers(
target_key, 20
)
# Create protobuf response
response = Message()
response.type = Message.MessageType.FIND_NODE
# Create sender_signed_peer_record for the response
envelope_bytes, _ = env_to_send_in_RPC(self.host)
response.senderRecord = envelope_bytes
# Add peer information to response
for peer_id in closest_peers:
peer_proto = response.closerPeers.add()
peer_proto.id = peer_id.to_bytes()
peer_proto.connection = Message.ConnectionType.CAN_CONNECT
# Add the signed-records of closest_peers if cached
closer_peer_envelope = (
self.host.get_peerstore().get_peer_record(peer_id)
)
if isinstance(closer_peer_envelope, Envelope):
peer_proto.signedRecord = (
closer_peer_envelope.marshal_envelope()
)
# Add addresses if available
try:
addrs = self.host.get_peerstore().addrs(peer_id)
if addrs:
for addr in addrs:
peer_proto.addrs.append(addr.to_bytes())
except Exception:
pass
# Send response
response_bytes = response.SerializeToString()
await stream.write(len(response_bytes).to_bytes(4, byteorder="big"))
await stream.write(response_bytes)
except Exception as parse_err:
logger.error(f"Failed to parse protocol buffer message: {parse_err}")
except Exception as e:
logger.debug(f"Error handling Kademlia stream: {e}")
finally:
await stream.close()
async def refresh_routing_table(self) -> None:
"""
Refresh the routing table by performing lookups for random keys.
Returns
-------
None
"""
logger.info("Refreshing routing table")
# Perform a lookup for ourselves to populate the routing table
local_id = self.host.get_id()
closest_peers = await self.find_closest_peers_network(local_id.to_bytes())
# Add discovered peers to routing table
for peer_id in closest_peers:
try:
addrs = self.host.get_peerstore().addrs(peer_id)
if addrs:
peer_info = PeerInfo(peer_id, addrs)
await self.routing_table.add_peer(peer_info)
except Exception as e:
logger.debug(f"Failed to add discovered peer {peer_id}: {e}")

612
libp2p/kad_dht/provider_store.py
View File

@ -1,612 +0,0 @@
"""
Provider record storage for Kademlia DHT.
This module implements the storage for content provider records in the Kademlia DHT.
"""
import logging
import time
from typing import (
Any,
)
from multiaddr import (
Multiaddr,
)
import trio
import varint
from libp2p.abc import (
IHost,
)
from libp2p.custom_types import (
TProtocol,
)
from libp2p.kad_dht.utils import maybe_consume_signed_record
from libp2p.peer.id import (
ID,
)
from libp2p.peer.peerinfo import (
PeerInfo,
)
from libp2p.peer.peerstore import env_to_send_in_RPC
from .common import (
ALPHA,
PROTOCOL_ID,
QUERY_TIMEOUT,
)
from .pb.kademlia_pb2 import (
Message,
)
# logger = logging.getLogger("libp2p.kademlia.provider_store")
logger = logging.getLogger("kademlia-example.provider_store")
# Constants for provider records (based on IPFS standards)
PROVIDER_RECORD_REPUBLISH_INTERVAL = 22 * 60 * 60 # 22 hours in seconds
PROVIDER_RECORD_EXPIRATION_INTERVAL = 48 * 60 * 60 # 48 hours in seconds
PROVIDER_ADDRESS_TTL = 30 * 60 # 30 minutes in seconds
class ProviderRecord:
"""
A record for a content provider in the DHT.
Contains the peer information and timestamp.
"""
def __init__(
self,
provider_info: PeerInfo,
timestamp: float | None = None,
) -> None:
"""
Initialize a new provider record.
:param provider_info: The provider's peer information
:param timestamp: Time this record was created/updated
(defaults to current time)
"""
self.provider_info = provider_info
self.timestamp = timestamp or time.time()
def is_expired(self) -> bool:
"""
Check if this provider record has expired.
Returns
-------
bool
True if the record has expired
"""
current_time = time.time()
return (current_time - self.timestamp) >= PROVIDER_RECORD_EXPIRATION_INTERVAL
def should_republish(self) -> bool:
"""
Check if this provider record should be republished.
Returns
-------
bool
True if the record should be republished
"""
current_time = time.time()
return (current_time - self.timestamp) >= PROVIDER_RECORD_REPUBLISH_INTERVAL
@property
def peer_id(self) -> ID:
"""Get the provider's peer ID."""
return self.provider_info.peer_id
@property
def addresses(self) -> list[Multiaddr]:
"""Get the provider's addresses."""
return self.provider_info.addrs
class ProviderStore:
"""
Store for content provider records in the Kademlia DHT.
Maps content keys to provider records, with support for expiration.
"""
def __init__(self, host: IHost, peer_routing: Any = None) -> None:
"""
Initialize a new provider store.
:param host: The libp2p host instance (optional)
:param peer_routing: The peer routing instance (optional)
"""
# Maps content keys to a dict of provider records (peer_id -> record)
self.providers: dict[bytes, dict[str, ProviderRecord]] = {}
self.host = host
self.peer_routing = peer_routing
self.providing_keys: set[bytes] = set()
self.local_peer_id = host.get_id()
async def _republish_provider_records(self) -> None:
"""Republish all provider records for content this node is providing."""
# First, republish keys we're actively providing
for key in self.providing_keys:
logger.debug(f"Republishing provider record for key {key.hex()}")
await self.provide(key)
# Also check for any records that should be republished
time.time()
for key, providers in self.providers.items():
for peer_id_str, record in providers.items():
# Only republish records for our own peer
if self.local_peer_id and str(self.local_peer_id) == peer_id_str:
if record.should_republish():
logger.debug(
f"Republishing old provider record for key {key.hex()}"
)
await self.provide(key)
async def provide(self, key: bytes) -> bool:
"""
Advertise that this node can provide a piece of content.
Finds the k closest peers to the key and sends them ADD_PROVIDER messages.
:param key: The content key (multihash) to advertise
Returns
-------
bool
True if the advertisement was successful
"""
if not self.host or not self.peer_routing:
logger.error("Host or peer_routing not initialized, cannot provide content")
return False
# Add to local provider store
local_addrs = []
for addr in self.host.get_addrs():
local_addrs.append(addr)
local_peer_info = PeerInfo(self.host.get_id(), local_addrs)
self.add_provider(key, local_peer_info)
# Track that we're providing this key
self.providing_keys.add(key)
# Find the k closest peers to the key
closest_peers = await self.peer_routing.find_closest_peers_network(key)
logger.debug(
"Found %d peers close to key %s for provider advertisement",
len(closest_peers),
key.hex(),
)
# Send ADD_PROVIDER messages to these ALPHA peers in parallel.
success_count = 0
for i in range(0, len(closest_peers), ALPHA):
batch = closest_peers[i : i + ALPHA]
results: list[bool] = [False] * len(batch)
async def send_one(
idx: int, peer_id: ID, results: list[bool] = results
) -> None:
if peer_id == self.local_peer_id:
return
try:
with trio.move_on_after(QUERY_TIMEOUT):
success = await self._send_add_provider(peer_id, key)
results[idx] = success
if not success:
logger.warning(f"Failed to send ADD_PROVIDER to {peer_id}")
except Exception as e:
logger.warning(f"Error sending ADD_PROVIDER to {peer_id}: {e}")
async with trio.open_nursery() as nursery:
for idx, peer_id in enumerate(batch):
nursery.start_soon(send_one, idx, peer_id, results)
success_count += sum(results)
logger.info(f"Successfully advertised to {success_count} peers")
return success_count > 0
async def _send_add_provider(self, peer_id: ID, key: bytes) -> bool:
"""
Send ADD_PROVIDER message to a specific peer.
:param peer_id: The peer to send the message to
:param key: The content key being provided
Returns
-------
bool
True if the message was successfully sent and acknowledged
"""
try:
result = False
# Open a stream to the peer
stream = await self.host.new_stream(peer_id, [TProtocol(PROTOCOL_ID)])
# Get our addresses to include in the message
addrs = []
for addr in self.host.get_addrs():
addrs.append(addr.to_bytes())
# Create the ADD_PROVIDER message
message = Message()
message.type = Message.MessageType.ADD_PROVIDER
message.key = key
# Create sender's signed-peer-record
envelope_bytes, _ = env_to_send_in_RPC(self.host)
message.senderRecord = envelope_bytes
# Add our provider info
provider = message.providerPeers.add()
provider.id = self.local_peer_id.to_bytes()
provider.addrs.extend(addrs)
# Add the provider's signed-peer-record
provider.signedRecord = envelope_bytes
# Serialize and send the message
proto_bytes = message.SerializeToString()
await stream.write(varint.encode(len(proto_bytes)))
await stream.write(proto_bytes)
logger.debug(f"Sent ADD_PROVIDER to {peer_id} for key {key.hex()}")
# Read response length prefix
length_bytes = b""
while True:
logger.debug("Reading response length prefix in add provider")
b = await stream.read(1)
if not b:
return False
length_bytes += b
if b[0] & 0x80 == 0:
break
response_length = varint.decode_bytes(length_bytes)
# Read response data
response_bytes = b""
remaining = response_length
while remaining > 0:
chunk = await stream.read(remaining)
if not chunk:
return False
response_bytes += chunk
remaining -= len(chunk)
# Parse response
response = Message()
response.ParseFromString(response_bytes)
if response.type == Message.MessageType.ADD_PROVIDER:
# Consume the sender's signed-peer-record if sent
if not maybe_consume_signed_record(response, self.host, peer_id):
logger.error(
"Received an invalid-signed-record, ignoring the response"
)
result = False
else:
result = True
except Exception as e:
logger.warning(f"Error sending ADD_PROVIDER to {peer_id}: {e}")
finally:
await stream.close()
return result
async def find_providers(self, key: bytes, count: int = 20) -> list[PeerInfo]:
"""
Find content providers for a given key.
:param key: The content key to look for
:param count: Maximum number of providers to return
Returns
-------
List[PeerInfo]
List of content providers
"""
if not self.host or not self.peer_routing:
logger.error("Host or peer_routing not initialized, cannot find providers")
return []
# Check local provider store first
local_providers = self.get_providers(key)
if local_providers:
logger.debug(
f"Found {len(local_providers)} providers locally for {key.hex()}"
)
return local_providers[:count]
logger.debug("local providers are %s", local_providers)
# Find the closest peers to the key
closest_peers = await self.peer_routing.find_closest_peers_network(key)
logger.debug(
f"Searching {len(closest_peers)} peers for providers of {key.hex()}"
)
# Query these peers for providers in batches of ALPHA, in parallel, with timeout
all_providers = []
for i in range(0, len(closest_peers), ALPHA):
batch = closest_peers[i : i + ALPHA]
batch_results: list[list[PeerInfo]] = [[] for _ in batch]
async def get_one(
idx: int,
peer_id: ID,
batch_results: list[list[PeerInfo]] = batch_results,
) -> None:
if peer_id == self.local_peer_id:
return
try:
with trio.move_on_after(QUERY_TIMEOUT):
providers = await self._get_providers_from_peer(peer_id, key)
if providers:
for provider in providers:
self.add_provider(key, provider)
batch_results[idx] = providers
else:
logger.debug(f"No providers found at peer {peer_id}")
except Exception as e:
logger.warning(f"Failed to get providers from {peer_id}: {e}")
async with trio.open_nursery() as nursery:
for idx, peer_id in enumerate(batch):
nursery.start_soon(get_one, idx, peer_id, batch_results)
for providers in batch_results:
all_providers.extend(providers)
if len(all_providers) >= count:
return all_providers[:count]
return all_providers[:count]
async def _get_providers_from_peer(self, peer_id: ID, key: bytes) -> list[PeerInfo]:
"""
Get content providers from a specific peer.
:param peer_id: The peer to query
:param key: The content key to look for
Returns
-------
List[PeerInfo]
List of provider information
"""
providers: list[PeerInfo] = []
try:
# Open a stream to the peer
stream = await self.host.new_stream(peer_id, [TProtocol(PROTOCOL_ID)])
try:
# Create the GET_PROVIDERS message
message = Message()
message.type = Message.MessageType.GET_PROVIDERS
message.key = key
# Create sender's signed-peer-record
envelope_bytes, _ = env_to_send_in_RPC(self.host)
message.senderRecord = envelope_bytes
# Serialize and send the message
proto_bytes = message.SerializeToString()
await stream.write(varint.encode(len(proto_bytes)))
await stream.write(proto_bytes)
# Read response length prefix
length_bytes = b""
while True:
b = await stream.read(1)
if not b:
return []
length_bytes += b
if b[0] & 0x80 == 0:
break
response_length = varint.decode_bytes(length_bytes)
# Read response data
response_bytes = b""
remaining = response_length
while remaining > 0:
chunk = await stream.read(remaining)
if not chunk:
return []
response_bytes += chunk
remaining -= len(chunk)
# Parse response
response = Message()
response.ParseFromString(response_bytes)
# Check response type
if response.type != Message.MessageType.GET_PROVIDERS:
return []
# Consume the sender's signed-peer-record if sent
if not maybe_consume_signed_record(response, self.host, peer_id):
logger.error(
"Received an invalid-signed-record, ignoring the response"
)
return []
# Extract provider information
providers = []
for provider_proto in response.providerPeers:
try:
# Consume the provider's signed-peer-record if sent, peer-id
# already sent with the provider-proto
if not maybe_consume_signed_record(provider_proto, self.host):
logger.error(
"Received an invalid-signed-record, "
"ignoring the response"
)
return []
# Create peer ID from bytes
provider_id = ID(provider_proto.id)
# Convert addresses to Multiaddr
addrs = []
for addr_bytes in provider_proto.addrs:
try:
addrs.append(Multiaddr(addr_bytes))
except Exception:
pass # Skip invalid addresses
# Create PeerInfo and add to result
providers.append(PeerInfo(provider_id, addrs))
except Exception as e:
logger.warning(f"Failed to parse provider info: {e}")
finally:
await stream.close()
return providers
except Exception as e:
logger.warning(f"Error getting providers from {peer_id}: {e}")
return []
def add_provider(self, key: bytes, provider: PeerInfo) -> None:
"""
Add a provider for a given content key.
:param key: The content key
:param provider: The provider's peer information
Returns
-------
None
"""
# Initialize providers for this key if needed
if key not in self.providers:
self.providers[key] = {}
# Add or update the provider record
peer_id_str = str(provider.peer_id) # Use string representation as dict key
self.providers[key][peer_id_str] = ProviderRecord(
provider_info=provider, timestamp=time.time()
)
logger.debug(f"Added provider {provider.peer_id} for key {key.hex()}")
def get_providers(self, key: bytes) -> list[PeerInfo]:
"""
Get all providers for a given content key.
:param key: The content key
Returns
-------
List[PeerInfo]
List of providers for the key
"""
if key not in self.providers:
return []
# Collect valid provider records (not expired)
result = []
current_time = time.time()
expired_peers = []
for peer_id_str, record in self.providers[key].items():
# Check if the record has expired
if current_time - record.timestamp > PROVIDER_RECORD_EXPIRATION_INTERVAL:
expired_peers.append(peer_id_str)
continue
# Use addresses only if they haven't expired
addresses = []
if current_time - record.timestamp <= PROVIDER_ADDRESS_TTL:
addresses = record.addresses
# Create PeerInfo and add to results
result.append(PeerInfo(record.peer_id, addresses))
# Clean up expired records
for peer_id in expired_peers:
del self.providers[key][peer_id]
# Remove the key if no providers left
if not self.providers[key]:
del self.providers[key]
return result
def cleanup_expired(self) -> None:
"""Remove expired provider records."""
current_time = time.time()
expired_keys = []
for key, providers in self.providers.items():
expired_providers = []
for peer_id_str, record in providers.items():
if (
current_time - record.timestamp
> PROVIDER_RECORD_EXPIRATION_INTERVAL
):
expired_providers.append(peer_id_str)
logger.debug(
f"Removing expired provider {peer_id_str} for key {key.hex()}"
)
# Remove expired providers
for peer_id in expired_providers:
del providers[peer_id]
# Track empty keys for removal
if not providers:
expired_keys.append(key)
# Remove empty keys
for key in expired_keys:
del self.providers[key]
logger.debug(f"Removed key with no providers: {key.hex()}")
def get_provided_keys(self, peer_id: ID) -> list[bytes]:
"""
Get all content keys provided by a specific peer.
:param peer_id: The peer ID to look for
Returns
-------
List[bytes]
List of content keys provided by the peer
"""
peer_id_str = str(peer_id)
result = []
for key, providers in self.providers.items():
if peer_id_str in providers:
result.append(key)
return result
def size(self) -> int:
"""
Get the total number of provider records in the store.
Returns
-------
int
Total number of provider records across all keys
"""
total = 0
for providers in self.providers.values():
total += len(providers)
return total

745
libp2p/kad_dht/routing_table.py
View File

@ -1,745 +0,0 @@
"""
Kademlia DHT routing table implementation.
"""
from collections import (
OrderedDict,
)
import logging
import time
import multihash
import trio
from libp2p.abc import (
IHost,
)
from libp2p.kad_dht.utils import (
xor_distance,
)
from libp2p.peer.id import (
ID,
)
from libp2p.peer.peerinfo import (
PeerInfo,
)
from .common import (
PROTOCOL_ID,
)
from .pb.kademlia_pb2 import (
Message,
)
# logger = logging.getLogger("libp2p.kademlia.routing_table")
logger = logging.getLogger("kademlia-example.routing_table")
# Default parameters
BUCKET_SIZE = 20 # k in the Kademlia paper
MAXIMUM_BUCKETS = 256 # Maximum number of buckets (for 256-bit keys)
PEER_REFRESH_INTERVAL = 60 # Interval to refresh peers in seconds
STALE_PEER_THRESHOLD = 3600 # Time in seconds after which a peer is considered stale
def peer_id_to_key(peer_id: ID) -> bytes:
"""
Convert a peer ID to a 256-bit key for routing table operations.
This normalizes all peer IDs to exactly 256 bits by hashing them with SHA-256.
:param peer_id: The peer ID to convert
:return: 32-byte (256-bit) key for routing table operations
"""
return multihash.digest(peer_id.to_bytes(), "sha2-256").digest
def key_to_int(key: bytes) -> int:
"""Convert a 256-bit key to an integer for range calculations."""
return int.from_bytes(key, byteorder="big")
class KBucket:
"""
A k-bucket implementation for the Kademlia DHT.
Each k-bucket stores up to k (BUCKET_SIZE) peers, sorted by least-recently seen.
"""
def __init__(
self,
host: IHost,
bucket_size: int = BUCKET_SIZE,
min_range: int = 0,
max_range: int = 2**256,
):
"""
Initialize a new k-bucket.
:param host: The host this bucket belongs to
:param bucket_size: Maximum number of peers to store in the bucket
:param min_range: Lower boundary of the bucket's key range (inclusive)
:param max_range: Upper boundary of the bucket's key range (exclusive)
"""
self.bucket_size = bucket_size
self.host = host
self.min_range = min_range
self.max_range = max_range
# Store PeerInfo objects along with last-seen timestamp
self.peers: OrderedDict[ID, tuple[PeerInfo, float]] = OrderedDict()
def peer_ids(self) -> list[ID]:
"""Get all peer IDs in the bucket."""
return list(self.peers.keys())
def peer_infos(self) -> list[PeerInfo]:
"""Get all PeerInfo objects in the bucket."""
return [info for info, _ in self.peers.values()]
def get_oldest_peer(self) -> ID | None:
"""Get the least-recently seen peer."""
if not self.peers:
return None
return next(iter(self.peers.keys()))
async def add_peer(self, peer_info: PeerInfo) -> bool:
"""
Add a peer to the bucket. Returns True if the peer was added or updated,
False if the bucket is full.
"""
current_time = time.time()
peer_id = peer_info.peer_id
# If peer is already in the bucket, move it to the end (most recently seen)
if peer_id in self.peers:
self.refresh_peer_last_seen(peer_id)
return True
# If bucket has space, add the peer
if len(self.peers) < self.bucket_size:
self.peers[peer_id] = (peer_info, current_time)
return True
# If bucket is full, we need to replace the least-recently seen peer
# Get the least-recently seen peer
oldest_peer_id = self.get_oldest_peer()
if oldest_peer_id is None:
logger.warning("No oldest peer found when bucket is full")
return False
# Check if the old peer is responsive to ping request
try:
# Try to ping the oldest peer, not the new peer
response = await self._ping_peer(oldest_peer_id)
if response:
# If the old peer is still alive, we will not add the new peer
logger.debug(
"Old peer %s is still alive, cannot add new peer %s",
oldest_peer_id,
peer_id,
)
return False
except Exception as e:
# If the old peer is unresponsive, we can replace it with the new peer
logger.debug(
"Old peer %s is unresponsive, replacing with new peer %s: %s",
oldest_peer_id,
peer_id,
str(e),
)
self.peers.popitem(last=False) # Remove oldest peer
self.peers[peer_id] = (peer_info, current_time)
return True
# If we got here, the oldest peer responded but we couldn't add the new peer
return False
def remove_peer(self, peer_id: ID) -> bool:
"""
Remove a peer from the bucket.
Returns True if the peer was in the bucket, False otherwise.
"""
if peer_id in self.peers:
del self.peers[peer_id]
return True
return False
def has_peer(self, peer_id: ID) -> bool:
"""Check if the peer is in the bucket."""
return peer_id in self.peers
def get_peer_info(self, peer_id: ID) -> PeerInfo | None:
"""Get the PeerInfo for a given peer ID if it exists in the bucket."""
if peer_id in self.peers:
return self.peers[peer_id][0]
return None
def size(self) -> int:
"""Get the number of peers in the bucket."""
return len(self.peers)
def get_stale_peers(self, stale_threshold_seconds: int = 3600) -> list[ID]:
"""
Get peers that haven't been pinged recently.
params: stale_threshold_seconds: Time in seconds
params: after which a peer is considered stale
Returns
-------
list[ID]
List of peer IDs that need to be refreshed
"""
current_time = time.time()
stale_peers = []
for peer_id, (_, last_seen) in self.peers.items():
if current_time - last_seen > stale_threshold_seconds:
stale_peers.append(peer_id)
return stale_peers
async def _periodic_peer_refresh(self) -> None:
"""Background task to periodically refresh peers"""
try:
while True:
await trio.sleep(PEER_REFRESH_INTERVAL) # Check every minute
# Find stale peers (not pinged in last hour)
stale_peers = self.get_stale_peers(
stale_threshold_seconds=STALE_PEER_THRESHOLD
)
if stale_peers:
logger.debug(f"Found {len(stale_peers)} stale peers to refresh")
for peer_id in stale_peers:
try:
# Try to ping the peer
logger.debug("Pinging stale peer %s", peer_id)
responce = await self._ping_peer(peer_id)
if responce:
# Update the last seen time
self.refresh_peer_last_seen(peer_id)
logger.debug(f"Refreshed peer {peer_id}")
else:
# If ping fails, remove the peer
logger.debug(f"Failed to ping peer {peer_id}")
self.remove_peer(peer_id)
logger.info(f"Removed unresponsive peer {peer_id}")
logger.debug(f"Successfully refreshed peer {peer_id}")
except Exception as e:
# If ping fails, remove the peer
logger.debug(
"Failed to ping peer %s: %s",
peer_id,
e,
)
self.remove_peer(peer_id)
logger.info(f"Removed unresponsive peer {peer_id}")
except trio.Cancelled:
logger.debug("Peer refresh task cancelled")
except Exception as e:
logger.error(f"Error in peer refresh task: {e}", exc_info=True)
async def _ping_peer(self, peer_id: ID) -> bool:
"""
Ping a peer using protobuf message to check
if it's still alive and update last seen time.
params: peer_id: The ID of the peer to ping
Returns
-------
bool
True if ping successful, False otherwise
"""
result = False
# Get peer info directly from the bucket
peer_info = self.get_peer_info(peer_id)
if not peer_info:
raise ValueError(f"Peer {peer_id} not in bucket")
try:
# Open a stream to the peer with the DHT protocol
stream = await self.host.new_stream(peer_id, [PROTOCOL_ID])
try:
# Create ping protobuf message
ping_msg = Message()
ping_msg.type = Message.PING # Use correct enum
# Serialize and send with length prefix (4 bytes big-endian)
msg_bytes = ping_msg.SerializeToString()
logger.debug(
f"Sending PING message to {peer_id}, size: {len(msg_bytes)} bytes"
)
await stream.write(len(msg_bytes).to_bytes(4, byteorder="big"))
await stream.write(msg_bytes)
# Wait for response with timeout
with trio.move_on_after(2): # 2 second timeout
# Read response length (4 bytes)
length_bytes = await stream.read(4)
if not length_bytes or len(length_bytes) < 4:
logger.warning(f"Peer {peer_id} disconnected during ping")
return False
msg_len = int.from_bytes(length_bytes, byteorder="big")
if (
msg_len <= 0 or msg_len > 1024 * 1024
): # Sanity check on message size
logger.warning(
f"Invalid message length from {peer_id}: {msg_len}"
)
return False
logger.debug(
f"Receiving response from {peer_id}, size: {msg_len} bytes"
)
# Read full message
response_bytes = await stream.read(msg_len)
if not response_bytes:
logger.warning(f"Failed to read response from {peer_id}")
return False
# Parse protobuf response
response = Message()
try:
response.ParseFromString(response_bytes)
except Exception as e:
logger.warning(
f"Failed to parse protobuf response from {peer_id}: {e}"
)
return False
if response.type == Message.PING:
# Update the last seen timestamp for this peer
logger.debug(f"Successfully pinged peer {peer_id}")
result = True
return result
else:
logger.warning(
f"Unexpected response type from {peer_id}: {response.type}"
)
return False
# If we get here, the ping timed out
logger.warning(f"Ping to peer {peer_id} timed out")
return False
finally:
await stream.close()
return result
except Exception as e:
logger.error(f"Error pinging peer {peer_id}: {str(e)}")
return False
def refresh_peer_last_seen(self, peer_id: ID) -> bool:
"""
Update the last-seen timestamp for a peer in the bucket.
params: peer_id: The ID of the peer to refresh
Returns
-------
bool
True if the peer was found and refreshed, False otherwise
"""
if peer_id in self.peers:
# Get current peer info and update the timestamp
peer_info, _ = self.peers[peer_id]
current_time = time.time()
self.peers[peer_id] = (peer_info, current_time)
# Move to end of ordered dict to mark as most recently seen
self.peers.move_to_end(peer_id)
return True
return False
def key_in_range(self, key: bytes) -> bool:
"""
Check if a key is in the range of this bucket.
params: key: The key to check (bytes)
Returns
-------
bool
True if the key is in range, False otherwise
"""
key_int = key_to_int(key)
return self.min_range <= key_int < self.max_range
def peer_id_in_range(self, peer_id: ID) -> bool:
"""
Check if a peer ID is in the range of this bucket.
params: peer_id: The peer ID to check
Returns
-------
bool
True if the peer ID is in range, False otherwise
"""
key = peer_id_to_key(peer_id)
return self.key_in_range(key)
def split(self) -> tuple["KBucket", "KBucket"]:
"""
Split the bucket into two buckets.
Returns
-------
tuple
(lower_bucket, upper_bucket)
"""
midpoint = (self.min_range + self.max_range) // 2
lower_bucket = KBucket(self.host, self.bucket_size, self.min_range, midpoint)
upper_bucket = KBucket(self.host, self.bucket_size, midpoint, self.max_range)
# Redistribute peers
for peer_id, (peer_info, timestamp) in self.peers.items():
peer_key = peer_id_to_key(peer_id)
peer_key_int = key_to_int(peer_key)
if peer_key_int < midpoint:
lower_bucket.peers[peer_id] = (peer_info, timestamp)
else:
upper_bucket.peers[peer_id] = (peer_info, timestamp)
return lower_bucket, upper_bucket
class RoutingTable:
"""
The Kademlia routing table maintains information on which peers to contact for any
given peer ID in the network.
"""
def __init__(self, local_id: ID, host: IHost) -> None:
"""
Initialize the routing table.
:param local_id: The ID of the local node.
:param host: The host this routing table belongs to.
"""
self.local_id = local_id
self.host = host
self.buckets = [KBucket(host, BUCKET_SIZE)]
async def add_peer(self, peer_obj: PeerInfo | ID) -> bool:
"""
Add a peer to the routing table.
:param peer_obj: Either PeerInfo object or peer ID to add
Returns
-------
bool: True if the peer was added or updated, False otherwise
"""
peer_id = None
peer_info = None
try:
# Handle different types of input
if isinstance(peer_obj, PeerInfo):
# Already have PeerInfo object
peer_info = peer_obj
peer_id = peer_obj.peer_id
else:
# Assume it's a peer ID
peer_id = peer_obj
# Try to get addresses from the peerstore if available
try:
addrs = self.host.get_peerstore().addrs(peer_id)
if addrs:
# Create PeerInfo object
peer_info = PeerInfo(peer_id, addrs)
else:
logger.debug(
"No addresses found for peer %s in peerstore, skipping",
peer_id,
)
return False
except Exception as peerstore_error:
# Handle case where peer is not in peerstore yet
logger.debug(
"Peer %s not found in peerstore: %s, skipping",
peer_id,
str(peerstore_error),
)
return False
# Don't add ourselves
if peer_id == self.local_id:
return False
# Find the right bucket for this peer
bucket = self.find_bucket(peer_id)
# Try to add to the bucket
success = await bucket.add_peer(peer_info)
if success:
logger.debug(f"Successfully added peer {peer_id} to routing table")
return True
# If bucket is full and couldn't add peer, try splitting the bucket
# Only split if the bucket contains our Peer ID
if self._should_split_bucket(bucket):
logger.debug(
f"Bucket is full, attempting to split bucket for peer {peer_id}"
)
split_success = self._split_bucket(bucket)
if split_success:
# After splitting,
# find the appropriate bucket for the peer and try to add it
target_bucket = self.find_bucket(peer_info.peer_id)
success = await target_bucket.add_peer(peer_info)
if success:
logger.debug(
f"Successfully added peer {peer_id} after bucket split"
)
return True
else:
logger.debug(
f"Failed to add peer {peer_id} even after bucket split"
)
return False
else:
logger.debug(f"Failed to split bucket for peer {peer_id}")
return False
else:
logger.debug(
f"Bucket is full and cannot be split, peer {peer_id} not added"
)
return False
except Exception as e:
logger.debug(f"Error adding peer {peer_obj} to routing table: {e}")
return False
def remove_peer(self, peer_id: ID) -> bool:
"""
Remove a peer from the routing table.
:param peer_id: The ID of the peer to remove
Returns
-------
bool: True if the peer was removed, False otherwise
"""
bucket = self.find_bucket(peer_id)
return bucket.remove_peer(peer_id)
def find_bucket(self, peer_id: ID) -> KBucket:
"""
Find the bucket that would contain the given peer ID.
:param peer_id: The peer ID to find a bucket for
Returns
-------
KBucket: The bucket for this peer
"""
for bucket in self.buckets:
if bucket.peer_id_in_range(peer_id):
return bucket
return self.buckets[0]
def find_local_closest_peers(self, key: bytes, count: int = 20) -> list[ID]:
"""
Find the closest peers to a given key.
:param key: The key to find closest peers to (bytes)
:param count: Maximum number of peers to return
Returns
-------
List[ID]: List of peer IDs closest to the key
"""
# Get all peers from all buckets
all_peers = []
for bucket in self.buckets:
all_peers.extend(bucket.peer_ids())
# Sort by XOR distance to the key
def distance_to_key(peer_id: ID) -> int:
peer_key = peer_id_to_key(peer_id)
return xor_distance(peer_key, key)
all_peers.sort(key=distance_to_key)
return all_peers[:count]
def get_peer_ids(self) -> list[ID]:
"""
Get all peer IDs in the routing table.
Returns
-------
:param List[ID]: List of all peer IDs
"""
peers = []
for bucket in self.buckets:
peers.extend(bucket.peer_ids())
return peers
def get_peer_info(self, peer_id: ID) -> PeerInfo | None:
"""
Get the peer info for a specific peer.
:param peer_id: The ID of the peer to get info for
Returns
-------
PeerInfo: The peer info, or None if not found
"""
bucket = self.find_bucket(peer_id)
return bucket.get_peer_info(peer_id)
def peer_in_table(self, peer_id: ID) -> bool:
"""
Check if a peer is in the routing table.
:param peer_id: The ID of the peer to check
Returns
-------
bool: True if the peer is in the routing table, False otherwise
"""
bucket = self.find_bucket(peer_id)
return bucket.has_peer(peer_id)
def size(self) -> int:
"""
Get the number of peers in the routing table.
Returns
-------
int: Number of peers
"""
count = 0
for bucket in self.buckets:
count += bucket.size()
return count
def get_stale_peers(self, stale_threshold_seconds: int = 3600) -> list[ID]:
"""
Get all stale peers from all buckets
params: stale_threshold_seconds:
Time in seconds after which a peer is considered stale
Returns
-------
list[ID]
List of stale peer IDs
"""
stale_peers = []
for bucket in self.buckets:
stale_peers.extend(bucket.get_stale_peers(stale_threshold_seconds))
return stale_peers
def get_peer_infos(self) -> list[PeerInfo]:
"""
Get all PeerInfo objects in the routing table.
Returns
-------
List[PeerInfo]: List of all PeerInfo objects
"""
peer_infos = []
for bucket in self.buckets:
peer_infos.extend(bucket.peer_infos())
return peer_infos
def cleanup_routing_table(self) -> None:
"""
Cleanup the routing table by removing all data.
This is useful for resetting the routing table during tests or reinitialization.
"""
self.buckets = [KBucket(self.host, BUCKET_SIZE)]
logger.info("Routing table cleaned up, all data removed.")
def _should_split_bucket(self, bucket: KBucket) -> bool:
"""
Check if a bucket should be split according to Kademlia rules.
:param bucket: The bucket to check
:return: True if the bucket should be split
"""
# Check if we've exceeded maximum buckets
if len(self.buckets) >= MAXIMUM_BUCKETS:
logger.debug("Maximum number of buckets reached, cannot split")
return False
# Check if the bucket contains our local ID
local_key = peer_id_to_key(self.local_id)
local_key_int = key_to_int(local_key)
contains_local_id = bucket.min_range <= local_key_int < bucket.max_range
logger.debug(
f"Bucket range: {bucket.min_range} - {bucket.max_range}, "
f"local_key_int: {local_key_int}, contains_local: {contains_local_id}"
)
return contains_local_id
def _split_bucket(self, bucket: KBucket) -> bool:
"""
Split a bucket into two buckets.
:param bucket: The bucket to split
:return: True if the bucket was successfully split
"""
try:
# Find the bucket index
bucket_index = self.buckets.index(bucket)
logger.debug(f"Splitting bucket at index {bucket_index}")
# Split the bucket
lower_bucket, upper_bucket = bucket.split()
# Replace the original bucket with the two new buckets
self.buckets[bucket_index] = lower_bucket
self.buckets.insert(bucket_index + 1, upper_bucket)
logger.debug(
f"Bucket split successful. New bucket count: {len(self.buckets)}"
)
logger.debug(
f"Lower bucket range: "
f"{lower_bucket.min_range} - {lower_bucket.max_range}, "
f"peers: {lower_bucket.size()}"
)
logger.debug(
f"Upper bucket range: "
f"{upper_bucket.min_range} - {upper_bucket.max_range}, "
f"peers: {upper_bucket.size()}"
)
return True
except Exception as e:
logger.error(f"Error splitting bucket: {e}")
return False

197
libp2p/kad_dht/utils.py
View File

@ -1,197 +0,0 @@
"""
Utility functions for Kademlia DHT implementation.
"""
import logging
import base58
import multihash
from libp2p.abc import IHost
from libp2p.peer.envelope import consume_envelope
from libp2p.peer.id import (
ID,
)
from .pb.kademlia_pb2 import (
Message,
)
logger = logging.getLogger("kademlia-example.utils")
def maybe_consume_signed_record(
msg: Message | Message.Peer, host: IHost, peer_id: ID | None = None
) -> bool:
"""
Attempt to parse and store a signed-peer-record (Envelope) received during
DHT communication. If the record is invalid, the peer-id does not match, or
updating the peerstore fails, the function logs an error and returns False.
Parameters
----------
msg : Message | Message.Peer
The protobuf message received during DHT communication. Can either be a
top-level `Message` containing `senderRecord` or a `Message.Peer`
containing `signedRecord`.
host : IHost
The local host instance, providing access to the peerstore for storing
verified peer records.
peer_id : ID | None, optional
The expected peer ID for record validation. If provided, the peer ID
inside the record must match this value.
Returns
-------
bool
True if a valid signed peer record was successfully consumed and stored,
False otherwise.
"""
if isinstance(msg, Message):
if msg.HasField("senderRecord"):
try:
# Convert the signed-peer-record(Envelope) from
# protobuf bytes
envelope, record = consume_envelope(
msg.senderRecord,
"libp2p-peer-record",
)
if not (isinstance(peer_id, ID) and record.peer_id == peer_id):
return False
# Use the default TTL of 2 hours (7200 seconds)
if not host.get_peerstore().consume_peer_record(envelope, 7200):
logger.error("Failed to update the Certified-Addr-Book")
return False
except Exception as e:
logger.error("Failed to update the Certified-Addr-Book: %s", e)
return False
else:
if msg.HasField("signedRecord"):
try:
# Convert the signed-peer-record(Envelope) from
# protobuf bytes
envelope, record = consume_envelope(
msg.signedRecord,
"libp2p-peer-record",
)
if not record.peer_id.to_bytes() == msg.id:
return False
# Use the default TTL of 2 hours (7200 seconds)
if not host.get_peerstore().consume_peer_record(envelope, 7200):
logger.error("Failed to update the Certified-Addr-Book")
return False
except Exception as e:
logger.error(
"Failed to update the Certified-Addr-Book: %s",
e,
)
return False
return True
def create_key_from_binary(binary_data: bytes) -> bytes:
"""
Creates a key for the DHT by hashing binary data with SHA-256.
params: binary_data: The binary data to hash.
Returns
-------
bytes: The resulting key.
"""
return multihash.digest(binary_data, "sha2-256").digest
def xor_distance(key1: bytes, key2: bytes) -> int:
"""
Calculate the XOR distance between two keys.
params: key1: First key (bytes)
params: key2: Second key (bytes)
Returns
-------
int: The XOR distance between the keys
"""
# Ensure the inputs are bytes
if not isinstance(key1, bytes) or not isinstance(key2, bytes):
raise TypeError("Both key1 and key2 must be bytes objects")
# Convert to integers
k1 = int.from_bytes(key1, byteorder="big")
k2 = int.from_bytes(key2, byteorder="big")
# Calculate XOR distance
return k1 ^ k2
def bytes_to_base58(data: bytes) -> str:
"""
Convert bytes to base58 encoded string.
params: data: Input bytes
Returns
-------
str: Base58 encoded string
"""
return base58.b58encode(data).decode("utf-8")
def sort_peer_ids_by_distance(target_key: bytes, peer_ids: list[ID]) -> list[ID]:
"""
Sort a list of peer IDs by their distance to the target key.
params: target_key: The target key to measure distance from
params: peer_ids: List of peer IDs to sort
Returns
-------
List[ID]: Sorted list of peer IDs from closest to furthest
"""
def get_distance(peer_id: ID) -> int:
# Hash the peer ID bytes to get a key for distance calculation
peer_hash = multihash.digest(peer_id.to_bytes(), "sha2-256").digest
return xor_distance(target_key, peer_hash)
return sorted(peer_ids, key=get_distance)
def shared_prefix_len(first: bytes, second: bytes) -> int:
"""
Calculate the number of prefix bits shared by two byte sequences.
params: first: First byte sequence
params: second: Second byte sequence
Returns
-------
int: Number of shared prefix bits
"""
# Compare each byte to find the first bit difference
common_length = 0
for i in range(min(len(first), len(second))):
byte_first = first[i]
byte_second = second[i]
if byte_first == byte_second:
common_length += 8
else:
# Find specific bit where they differ
xor = byte_first ^ byte_second
# Count leading zeros in the xor result
for j in range(7, -1, -1):
if (xor >> j) & 1 == 1:
return common_length + (7 - j)
# This shouldn't be reached if xor != 0
return common_length + 8
return common_length

416
libp2p/kad_dht/value_store.py
View File

@ -1,416 +0,0 @@
"""
Value store implementation for Kademlia DHT.
Provides a way to store and retrieve key-value pairs with optional expiration.
"""
import logging
import time
import varint
from libp2p.abc import (
IHost,
)
from libp2p.custom_types import (
TProtocol,
)
from libp2p.kad_dht.utils import maybe_consume_signed_record
from libp2p.peer.id import (
ID,
)
from libp2p.peer.peerstore import env_to_send_in_RPC
from .common import (
DEFAULT_TTL,
PROTOCOL_ID,
)
from .pb.kademlia_pb2 import (
Message,
)
# logger = logging.getLogger("libp2p.kademlia.value_store")
logger = logging.getLogger("kademlia-example.value_store")
class ValueStore:
"""
Store for key-value pairs in a Kademlia DHT.
Values are stored with a timestamp and optional expiration time.
"""
def __init__(self, host: IHost, local_peer_id: ID):
"""
Initialize an empty value store.
:param host: The libp2p host instance.
:param local_peer_id: The local peer ID to ignore in peer requests.
"""
# Store format: {key: (value, validity)}
self.store: dict[bytes, tuple[bytes, float]] = {}
# Store references to the host and local peer ID for making requests
self.host = host
self.local_peer_id = local_peer_id
def put(self, key: bytes, value: bytes, validity: float = 0.0) -> None:
"""
Store a value in the DHT.
:param key: The key to store the value under
:param value: The value to store
:param validity: validity in seconds before the value expires.
Defaults to `DEFAULT_TTL` if set to 0.0.
Returns
-------
None
"""
if validity == 0.0:
validity = time.time() + DEFAULT_TTL
logger.debug(
"Storing value for key %s... with validity %s", key.hex(), validity
)
self.store[key] = (value, validity)
logger.debug(f"Stored value for key {key.hex()}")
async def _store_at_peer(self, peer_id: ID, key: bytes, value: bytes) -> bool:
"""
Store a value at a specific peer.
params: peer_id: The ID of the peer to store the value at
params: key: The key to store
params: value: The value to store
Returns
-------
bool
True if the value was successfully stored, False otherwise
"""
result = False
stream = None
try:
# Don't try to store at ourselves
if self.local_peer_id and peer_id == self.local_peer_id:
result = True
return result
if not self.host:
logger.error("Host not initialized, cannot store value at peer")
return False
logger.debug(f"Storing value for key {key.hex()} at peer {peer_id}")
# Open a stream to the peer
stream = await self.host.new_stream(peer_id, [PROTOCOL_ID])
logger.debug(f"Opened stream to peer {peer_id}")
# Create the PUT_VALUE message with protobuf
message = Message()
message.type = Message.MessageType.PUT_VALUE
# Create sender's signed-peer-record
envelope_bytes, _ = env_to_send_in_RPC(self.host)
message.senderRecord = envelope_bytes
# Set message fields
message.key = key
message.record.key = key
message.record.value = value
message.record.timeReceived = str(time.time())
# Serialize and send the protobuf message with length prefix
proto_bytes = message.SerializeToString()
await stream.write(varint.encode(len(proto_bytes)))
await stream.write(proto_bytes)
logger.debug("Sent PUT_VALUE protobuf message with varint length")
# Read varint-prefixed response length
length_bytes = b""
while True:
logger.debug("Reading varint length prefix for response...")
b = await stream.read(1)
if not b:
logger.warning("Connection closed while reading varint length")
return False
length_bytes += b
if b[0] & 0x80 == 0:
break
logger.debug(f"Received varint length bytes: {length_bytes.hex()}")
response_length = varint.decode_bytes(length_bytes)
logger.debug("Response length: %d bytes", response_length)
# Read response data
response_bytes = b""
remaining = response_length
while remaining > 0:
chunk = await stream.read(remaining)
if not chunk:
logger.debug(
f"Connection closed by peer {peer_id} while reading data"
)
return False
response_bytes += chunk
remaining -= len(chunk)
# Parse protobuf response
response = Message()
response.ParseFromString(response_bytes)
# Check if response is valid
if response.type == Message.MessageType.PUT_VALUE:
# Consume the sender's signed-peer-record if sent
if not maybe_consume_signed_record(response, self.host, peer_id):
logger.error(
"Received an invalid-signed-record, ignoring the response"
)
return False
if response.key == key:
result = True
return result
except Exception as e:
logger.warning(f"Failed to store value at peer {peer_id}: {e}")
return False
finally:
if stream:
await stream.close()
return result
def get(self, key: bytes) -> bytes | None:
"""
Retrieve a value from the DHT.
params: key: The key to look up
Returns
-------
Optional[bytes]
The stored value, or None if not found or expired
"""
logger.debug("Retrieving value for key %s...", key.hex()[:8])
if key not in self.store:
return None
value, validity = self.store[key]
logger.debug(
"Found value for key %s... with validity %s",
key.hex(),
validity,
)
# Check if the value has expired
if validity is not None and validity < time.time():
logger.debug(
"Value for key %s... has expired, removing it",
key.hex()[:8],
)
self.remove(key)
return None
return value
async def _get_from_peer(self, peer_id: ID, key: bytes) -> bytes | None:
"""
Retrieve a value from a specific peer.
params: peer_id: The ID of the peer to retrieve the value from
params: key: The key to retrieve
Returns
-------
Optional[bytes]
The value if found, None otherwise
"""
stream = None
try:
# Don't try to get from ourselves
if peer_id == self.local_peer_id:
return None
logger.debug(f"Getting value for key {key.hex()} from peer {peer_id}")
# Open a stream to the peer
stream = await self.host.new_stream(peer_id, [TProtocol(PROTOCOL_ID)])
logger.debug(f"Opened stream to peer {peer_id} for GET_VALUE")
# Create the GET_VALUE message using protobuf
message = Message()
message.type = Message.MessageType.GET_VALUE
message.key = key
# Create sender's signed-peer-record
envelope_bytes, _ = env_to_send_in_RPC(self.host)
message.senderRecord = envelope_bytes
# Serialize and send the protobuf message
proto_bytes = message.SerializeToString()
await stream.write(varint.encode(len(proto_bytes)))
await stream.write(proto_bytes)
# Read response length
length_bytes = b""
while True:
b = await stream.read(1)
if not b:
logger.warning("Connection closed while reading length")
return None
length_bytes += b
if b[0] & 0x80 == 0:
break
response_length = varint.decode_bytes(length_bytes)
# Read response data
response_bytes = b""
remaining = response_length
while remaining > 0:
chunk = await stream.read(remaining)
if not chunk:
logger.debug(
f"Connection closed by peer {peer_id} while reading data"
)
return None
response_bytes += chunk
remaining -= len(chunk)
# Parse protobuf response
try:
response = Message()
response.ParseFromString(response_bytes)
logger.debug(
f"Received protobuf response from peer"
f" {peer_id}, type: {response.type}"
)
# Process protobuf response
if (
response.type == Message.MessageType.GET_VALUE
and response.HasField("record")
and response.record.value
):
# Consume the sender's signed-peer-record
if not maybe_consume_signed_record(response, self.host, peer_id):
logger.error(
"Received an invalid-signed-record, ignoring the response"
)
return None
logger.debug(
f"Received value for key {key.hex()} from peer {peer_id}"
)
return response.record.value
# Handle case where value is not found but peer infos are returned
else:
logger.debug(
f"Value not found for key {key.hex()} from peer {peer_id},"
f" received {len(response.closerPeers)} closer peers"
)
return None
except Exception as proto_err:
logger.warning(f"Failed to parse as protobuf: {proto_err}")
return None
except Exception as e:
logger.warning(f"Failed to get value from peer {peer_id}: {e}")
return None
finally:
if stream:
await stream.close()
def remove(self, key: bytes) -> bool:
"""
Remove a value from the DHT.
params: key: The key to remove
Returns
-------
bool
True if the key was found and removed, False otherwise
"""
if key in self.store:
del self.store[key]
logger.debug(f"Removed value for key {key.hex()[:8]}...")
return True
return False
def has(self, key: bytes) -> bool:
"""
Check if a key exists in the store and hasn't expired.
params: key: The key to check
Returns
-------
bool
True if the key exists and hasn't expired, False otherwise
"""
if key not in self.store:
return False
_, validity = self.store[key]
if validity is not None and time.time() > validity:
self.remove(key)
return False
return True
def cleanup_expired(self) -> int:
"""
Remove all expired values from the store.
Returns
-------
int
The number of expired values that were removed
"""
current_time = time.time()
expired_keys = [
key for key, (_, validity) in self.store.items() if current_time > validity
]
for key in expired_keys:
del self.store[key]
if expired_keys:
logger.debug(f"Cleaned up {len(expired_keys)} expired values")
return len(expired_keys)
def get_keys(self) -> list[bytes]:
"""
Get all non-expired keys in the store.
Returns
-------
list[bytes]
List of keys
"""
# Clean up expired values first
self.cleanup_expired()
return list(self.store.keys())
def size(self) -> int:
"""
Get the number of items in the store (after removing expired entries).
Returns
-------
int
Number of items
"""
self.cleanup_expired()
return len(self.store)

37
libp2p/network/connection/swarm_connection.py
View File

@ -3,7 +3,6 @@ from typing import (
TYPE_CHECKING,
)
from multiaddr import Multiaddr
import trio
from libp2p.abc import (
@ -23,8 +22,7 @@ if TYPE_CHECKING:
"""
Reference: https://github.com/libp2p/go-libp2p-swarm/blob/
04c86bbdafd390651cb2ee14e334f7caeedad722/swarm_conn.go
Reference: https://github.com/libp2p/go-libp2p-swarm/blob/04c86bbdafd390651cb2ee14e334f7caeedad722/swarm_conn.go
"""
@ -44,21 +42,6 @@ class SwarmConn(INetConn):
self.streams = set()
self.event_closed = trio.Event()
self.event_started = trio.Event()
# Provide back-references/hooks expected by NetStream
try:
setattr(self.muxed_conn, "swarm", self.swarm)
# NetStream expects an awaitable remove_stream hook
async def _remove_stream_hook(stream: NetStream) -> None:
self.remove_stream(stream)
setattr(self.muxed_conn, "remove_stream", _remove_stream_hook)
except Exception as e:
logging.warning(
f"Failed to set optional conveniences on muxed_conn "
f"for peer {muxed_conn.peer_id}: {e}"
)
# optional conveniences
if hasattr(muxed_conn, "on_close"):
logging.debug(f"Setting on_close for peer {muxed_conn.peer_id}")
setattr(muxed_conn, "on_close", self._on_muxed_conn_closed)
@ -164,24 +147,6 @@ class SwarmConn(INetConn):
def get_streams(self) -> tuple[NetStream, ...]:
return tuple(self.streams)
def get_transport_addresses(self) -> list[Multiaddr]:
"""
Retrieve the transport addresses used by this connection.
Returns
-------
list[Multiaddr]
A list of multiaddresses used by the transport.
"""
# Return the addresses from the peerstore for this peer
try:
peer_id = self.muxed_conn.peer_id
return self.swarm.peerstore.addrs(peer_id)
except Exception as e:
logging.warning(f"Error getting transport addresses: {e}")
return []
def remove_stream(self, stream: NetStream) -> None:
if stream not in self.streams:
return

473
libp2p/network/swarm.py
View File

@ -1,10 +1,4 @@
from collections.abc import (
Awaitable,
Callable,
)
from dataclasses import dataclass
import logging
import random
from multiaddr import (
Multiaddr,
@ -61,59 +55,6 @@ from .exceptions import (
logger = logging.getLogger("libp2p.network.swarm")
@dataclass
class RetryConfig:
"""
Configuration for retry logic with exponential backoff.
This configuration controls how connection attempts are retried when they fail.
The retry mechanism uses exponential backoff with jitter to prevent thundering
herd problems in distributed systems.
Attributes:
max_retries: Maximum number of retry attempts before giving up.
Default: 3 attempts
initial_delay: Initial delay in seconds before the first retry.
Default: 0.1 seconds (100ms)
max_delay: Maximum delay cap in seconds to prevent excessive wait times.
Default: 30.0 seconds
backoff_multiplier: Multiplier for exponential backoff (each retry multiplies
the delay by this factor). Default: 2.0 (doubles each time)
jitter_factor: Random jitter factor (0.0-1.0) to add randomness to delays
and prevent synchronized retries. Default: 0.1 (10% jitter)
"""
max_retries: int = 3
initial_delay: float = 0.1
max_delay: float = 30.0
backoff_multiplier: float = 2.0
jitter_factor: float = 0.1
@dataclass
class ConnectionConfig:
"""
Configuration for multi-connection support.
This configuration controls how multiple connections per peer are managed,
including connection limits, timeouts, and load balancing strategies.
Attributes:
max_connections_per_peer: Maximum number of connections allowed to a single
peer. Default: 3 connections
connection_timeout: Timeout in seconds for establishing new connections.
Default: 30.0 seconds
load_balancing_strategy: Strategy for distributing streams across connections.
Options: "round_robin" (default) or "least_loaded"
"""
max_connections_per_peer: int = 3
connection_timeout: float = 30.0
load_balancing_strategy: str = "round_robin" # or "least_loaded"
def create_default_stream_handler(network: INetworkService) -> StreamHandlerFn:
async def stream_handler(stream: INetStream) -> None:
await network.get_manager().wait_finished()
@ -126,8 +67,9 @@ class Swarm(Service, INetworkService):
peerstore: IPeerStore
upgrader: TransportUpgrader
transport: ITransport
# Enhanced: Support for multiple connections per peer
connections: dict[ID, list[INetConn]] # Multiple connections per peer
# TODO: Connection and `peer_id` are 1-1 mapping in our implementation,
# whereas in Go one `peer_id` may point to multiple connections.
connections: dict[ID, INetConn]
listeners: dict[str, IListener]
common_stream_handler: StreamHandlerFn
listener_nursery: trio.Nursery | None
@ -135,31 +77,18 @@ class Swarm(Service, INetworkService):
notifees: list[INotifee]
# Enhanced: New configuration
retry_config: RetryConfig
connection_config: ConnectionConfig
_round_robin_index: dict[ID, int]
def __init__(
self,
peer_id: ID,
peerstore: IPeerStore,
upgrader: TransportUpgrader,
transport: ITransport,
retry_config: RetryConfig | None = None,
connection_config: ConnectionConfig | None = None,
):
self.self_id = peer_id
self.peerstore = peerstore
self.upgrader = upgrader
self.transport = transport
# Enhanced: Initialize retry and connection configuration
self.retry_config = retry_config or RetryConfig()
self.connection_config = connection_config or ConnectionConfig()
# Enhanced: Initialize connections as 1:many mapping
self.connections = {}
self.connections = dict()
self.listeners = dict()
# Create Notifee array
@ -170,9 +99,6 @@ class Swarm(Service, INetworkService):
self.listener_nursery = None
self.event_listener_nursery_created = trio.Event()
# Load balancing state
self._round_robin_index = {}
async def run(self) -> None:
async with trio.open_nursery() as nursery:
# Create a nursery for listener tasks.
@ -192,74 +118,18 @@ class Swarm(Service, INetworkService):
def set_stream_handler(self, stream_handler: StreamHandlerFn) -> None:
self.common_stream_handler = stream_handler
def get_connections(self, peer_id: ID | None = None) -> list[INetConn]:
async def dial_peer(self, peer_id: ID) -> INetConn:
"""
Get connections for peer (like JS getConnections, Go ConnsToPeer).
Parameters
----------
peer_id : ID | None
The peer ID to get connections for. If None, returns all connections.
Returns
-------
list[INetConn]
List of connections to the specified peer, or all connections
if peer_id is None.
"""
if peer_id is not None:
return self.connections.get(peer_id, [])
# Return all connections from all peers
all_conns = []
for conns in self.connections.values():
all_conns.extend(conns)
return all_conns
def get_connections_map(self) -> dict[ID, list[INetConn]]:
"""
Get all connections map (like JS getConnectionsMap).
Returns
-------
dict[ID, list[INetConn]]
The complete mapping of peer IDs to their connection lists.
"""
return self.connections.copy()
def get_connection(self, peer_id: ID) -> INetConn | None:
"""
Get single connection for backward compatibility.
Parameters
----------
peer_id : ID
The peer ID to get a connection for.
Returns
-------
INetConn | None
The first available connection, or None if no connections exist.
"""
conns = self.get_connections(peer_id)
return conns[0] if conns else None
async def dial_peer(self, peer_id: ID) -> list[INetConn]:
"""
Try to create connections to peer_id with enhanced retry logic.
Try to create a connection to peer_id.
:param peer_id: peer if we want to dial
:raises SwarmException: raised when an error occurs
:return: list of muxed connections
:return: muxed connection
"""
# Check if we already have connections
existing_connections = self.get_connections(peer_id)
if existing_connections:
logger.debug(f"Reusing existing connections to peer {peer_id}")
return existing_connections
if peer_id in self.connections:
# If muxed connection already exists for peer_id,
# set muxed connection equal to existing muxed connection
return self.connections[peer_id]
logger.debug("attempting to dial peer %s", peer_id)
@ -272,19 +142,12 @@ class Swarm(Service, INetworkService):
if not addrs:
raise SwarmException(f"No known addresses to peer {peer_id}")
connections = []
exceptions: list[SwarmException] = []
# Enhanced: Try all known addresses with retry logic
# Try all known addresses
for multiaddr in addrs:
try:
connection = await self._dial_with_retry(multiaddr, peer_id)
connections.append(connection)
# Limit number of connections per peer
if len(connections) >= self.connection_config.max_connections_per_peer:
break
return await self.dial_addr(multiaddr, peer_id)
except SwarmException as e:
exceptions.append(e)
logger.debug(
@ -294,73 +157,15 @@ class Swarm(Service, INetworkService):
exc_info=e,
)
if not connections:
# Tried all addresses, raising exception.
raise SwarmException(
f"unable to connect to {peer_id}, no addresses established a "
"successful connection (with exceptions)"
) from MultiError(exceptions)
# Tried all addresses, raising exception.
raise SwarmException(
f"unable to connect to {peer_id}, no addresses established a successful "
"connection (with exceptions)"
) from MultiError(exceptions)
return connections
async def _dial_with_retry(self, addr: Multiaddr, peer_id: ID) -> INetConn:
async def dial_addr(self, addr: Multiaddr, peer_id: ID) -> INetConn:
"""
Enhanced: Dial with retry logic and exponential backoff.
:param addr: the address to dial
:param peer_id: the peer we want to connect to
:raises SwarmException: raised when all retry attempts fail
:return: network connection
"""
last_exception = None
for attempt in range(self.retry_config.max_retries + 1):
try:
return await self._dial_addr_single_attempt(addr, peer_id)
except Exception as e:
last_exception = e
if attempt < self.retry_config.max_retries:
delay = self._calculate_backoff_delay(attempt)
logger.debug(
f"Connection attempt {attempt + 1} failed, "
f"retrying in {delay:.2f}s: {e}"
)
await trio.sleep(delay)
else:
logger.debug(f"All {self.retry_config.max_retries} attempts failed")
# Convert the last exception to SwarmException for consistency
if last_exception is not None:
if isinstance(last_exception, SwarmException):
raise last_exception
else:
raise SwarmException(
f"Failed to connect after {self.retry_config.max_retries} attempts"
) from last_exception
# This should never be reached, but mypy requires it
raise SwarmException("Unexpected error in retry logic")
def _calculate_backoff_delay(self, attempt: int) -> float:
"""
Enhanced: Calculate backoff delay with jitter to prevent thundering herd.
:param attempt: the current attempt number (0-based)
:return: delay in seconds
"""
delay = min(
self.retry_config.initial_delay
* (self.retry_config.backoff_multiplier**attempt),
self.retry_config.max_delay,
)
# Add jitter to prevent synchronized retries
jitter = delay * self.retry_config.jitter_factor
return delay + random.uniform(-jitter, jitter)
async def _dial_addr_single_attempt(self, addr: Multiaddr, peer_id: ID) -> INetConn:
"""
Enhanced: Single attempt to dial an address (extracted from original dial_addr).
Try to create a connection to peer_id with addr.
:param addr: the address we want to connect with
:param peer_id: the peer we want to connect to
@ -382,7 +187,7 @@ class Swarm(Service, INetworkService):
# Per, https://discuss.libp2p.io/t/multistream-security/130, we first secure
# the conn and then mux the conn
try:
secured_conn = await self.upgrader.upgrade_security(raw_conn, True, peer_id)
secured_conn = await self.upgrader.upgrade_security(raw_conn, peer_id, True)
except SecurityUpgradeFailure as error:
logger.debug("failed to upgrade security for peer %s", peer_id)
await raw_conn.close()
@ -407,97 +212,19 @@ class Swarm(Service, INetworkService):
return swarm_conn
async def dial_addr(self, addr: Multiaddr, peer_id: ID) -> INetConn:
"""
Enhanced: Try to create a connection to peer_id with addr using retry logic.
:param addr: the address we want to connect with
:param peer_id: the peer we want to connect to
:raises SwarmException: raised when an error occurs
:return: network connection
"""
return await self._dial_with_retry(addr, peer_id)
async def new_stream(self, peer_id: ID) -> INetStream:
"""
Enhanced: Create a new stream with load balancing across multiple connections.
:param peer_id: peer_id of destination
:raises SwarmException: raised when an error occurs
:return: net stream instance
"""
logger.debug("attempting to open a stream to peer %s", peer_id)
# Get existing connections or dial new ones
connections = self.get_connections(peer_id)
if not connections:
connections = await self.dial_peer(peer_id)
swarm_conn = await self.dial_peer(peer_id)
# Load balancing strategy at interface level
connection = self._select_connection(connections, peer_id)
try:
net_stream = await connection.new_stream()
logger.debug("successfully opened a stream to peer %s", peer_id)
return net_stream
except Exception as e:
logger.debug(f"Failed to create stream on connection: {e}")
# Try other connections if available
for other_conn in connections:
if other_conn != connection:
try:
net_stream = await other_conn.new_stream()
logger.debug(
f"Successfully opened a stream to peer {peer_id} "
"using alternative connection"
)
return net_stream
except Exception:
continue
# All connections failed, raise exception
raise SwarmException(f"Failed to create stream to peer {peer_id}") from e
def _select_connection(self, connections: list[INetConn], peer_id: ID) -> INetConn:
"""
Select connection based on load balancing strategy.
Parameters
----------
connections : list[INetConn]
List of available connections.
peer_id : ID
The peer ID for round-robin tracking.
strategy : str
Load balancing strategy ("round_robin", "least_loaded", etc.).
Returns
-------
INetConn
Selected connection.
"""
if not connections:
raise ValueError("No connections available")
strategy = self.connection_config.load_balancing_strategy
if strategy == "round_robin":
# Simple round-robin selection
if peer_id not in self._round_robin_index:
self._round_robin_index[peer_id] = 0
index = self._round_robin_index[peer_id] % len(connections)
self._round_robin_index[peer_id] += 1
return connections[index]
elif strategy == "least_loaded":
# Find connection with least streams
return min(connections, key=lambda c: len(c.get_streams()))
else:
# Default to first connection
return connections[0]
net_stream = await swarm_conn.new_stream()
logger.debug("successfully opened a stream to peer %s", peer_id)
return net_stream
async def listen(self, *multiaddrs: Multiaddr) -> bool:
"""
@ -518,11 +245,9 @@ class Swarm(Service, INetworkService):
# We need to wait until `self.listener_nursery` is created.
await self.event_listener_nursery_created.wait()
success_count = 0
for maddr in multiaddrs:
if str(maddr) in self.listeners:
success_count += 1
continue
return True
async def conn_handler(
read_write_closer: ReadWriteCloser, maddr: Multiaddr = maddr
@ -532,7 +257,10 @@ class Swarm(Service, INetworkService):
# Per, https://discuss.libp2p.io/t/multistream-security/130, we first
# secure the conn and then mux the conn
try:
secured_conn = await self.upgrader.upgrade_security(raw_conn, False)
# FIXME: This dummy `ID(b"")` for the remote peer is useless.
secured_conn = await self.upgrader.upgrade_security(
raw_conn, ID(b""), False
)
except SecurityUpgradeFailure as error:
logger.debug("failed to upgrade security for peer at %s", maddr)
await raw_conn.close()
@ -573,14 +301,13 @@ class Swarm(Service, INetworkService):
# Call notifiers since event occurred
await self.notify_listen(maddr)
success_count += 1
logger.debug("successfully started listening on: %s", maddr)
return True
except OSError:
# Failed. Continue looping.
logger.debug("fail to listen on: %s", maddr)
# Return true if at least one address succeeded
return success_count > 0
# No maddr succeeded
return False
async def close(self) -> None:
"""
@ -593,25 +320,17 @@ class Swarm(Service, INetworkService):
# Perform alternative cleanup if the manager isn't initialized
# Close all connections manually
if hasattr(self, "connections"):
for peer_id, conns in list(self.connections.items()):
for conn in conns:
await conn.close()
for conn_id in list(self.connections.keys()):
conn = self.connections[conn_id]
await conn.close()
# Clear connection tracking dictionary
self.connections.clear()
# Close all listeners
if hasattr(self, "listeners"):
for maddr_str, listener in self.listeners.items():
for listener in self.listeners.values():
await listener.close()
# Notify about listener closure
try:
multiaddr = Multiaddr(maddr_str)
await self.notify_listen_close(multiaddr)
except Exception as e:
logger.warning(
f"Failed to notify listen_close for {maddr_str}: {e}"
)
self.listeners.clear()
# Close the transport if it exists and has a close method
@ -625,28 +344,12 @@ class Swarm(Service, INetworkService):
logger.debug("swarm successfully closed")
async def close_peer(self, peer_id: ID) -> None:
"""
Close all connections to the specified peer.
Parameters
----------
peer_id : ID
The peer ID to close connections for.
"""
connections = self.get_connections(peer_id)
if not connections:
if peer_id not in self.connections:
return
# Close all connections
for connection in connections:
try:
await connection.close()
except Exception as e:
logger.warning(f"Error closing connection to {peer_id}: {e}")
# Remove from connections dict
self.connections.pop(peer_id, None)
connection = self.connections[peer_id]
# NOTE: `connection.close` will delete `peer_id` from `self.connections`
# and `notify_disconnected` for us.
await connection.close()
logger.debug("successfully close the connection to peer %s", peer_id)
@ -665,71 +368,21 @@ class Swarm(Service, INetworkService):
await muxed_conn.event_started.wait()
self.manager.run_task(swarm_conn.start)
await swarm_conn.event_started.wait()
# Add to connections dict with deduplication
peer_id = muxed_conn.peer_id
if peer_id not in self.connections:
self.connections[peer_id] = []
# Check for duplicate connections by comparing the underlying muxed connection
for existing_conn in self.connections[peer_id]:
if existing_conn.muxed_conn == muxed_conn:
logger.debug(f"Connection already exists for peer {peer_id}")
# existing_conn is a SwarmConn since it's stored in the connections list
return existing_conn # type: ignore[return-value]
self.connections[peer_id].append(swarm_conn)
# Trim if we exceed max connections
max_conns = self.connection_config.max_connections_per_peer
if len(self.connections[peer_id]) > max_conns:
self._trim_connections(peer_id)
# Store muxed_conn with peer id
self.connections[muxed_conn.peer_id] = swarm_conn
# Call notifiers since event occurred
await self.notify_connected(swarm_conn)
return swarm_conn
def _trim_connections(self, peer_id: ID) -> None:
"""
Remove oldest connections when limit is exceeded.
"""
connections = self.connections[peer_id]
if len(connections) <= self.connection_config.max_connections_per_peer:
return
# Sort by creation time and remove oldest
# For now, just keep the most recent connections
max_conns = self.connection_config.max_connections_per_peer
connections_to_remove = connections[:-max_conns]
for conn in connections_to_remove:
logger.debug(f"Trimming old connection for peer {peer_id}")
trio.lowlevel.spawn_system_task(self._close_connection_async, conn)
# Keep only the most recent connections
max_conns = self.connection_config.max_connections_per_peer
self.connections[peer_id] = connections[-max_conns:]
async def _close_connection_async(self, connection: INetConn) -> None:
"""Close a connection asynchronously."""
try:
await connection.close()
except Exception as e:
logger.warning(f"Error closing connection: {e}")
def remove_conn(self, swarm_conn: SwarmConn) -> None:
"""
Simply remove the connection from Swarm's records, without closing
the connection.
"""
peer_id = swarm_conn.muxed_conn.peer_id
if peer_id in self.connections:
self.connections[peer_id] = [
conn for conn in self.connections[peer_id] if conn != swarm_conn
]
if not self.connections[peer_id]:
del self.connections[peer_id]
if peer_id not in self.connections:
return
del self.connections[peer_id]
# Notifee
@ -761,35 +414,7 @@ class Swarm(Service, INetworkService):
nursery.start_soon(notifee.listen, self, multiaddr)
async def notify_closed_stream(self, stream: INetStream) -> None:
async with trio.open_nursery() as nursery:
for notifee in self.notifees:
nursery.start_soon(notifee.closed_stream, self, stream)
raise NotImplementedError
async def notify_listen_close(self, multiaddr: Multiaddr) -> None:
async with trio.open_nursery() as nursery:
for notifee in self.notifees:
nursery.start_soon(notifee.listen_close, self, multiaddr)
# Generic notifier used by NetStream._notify_closed
async def notify_all(self, notifier: Callable[[INotifee], Awaitable[None]]) -> None:
async with trio.open_nursery() as nursery:
for notifee in self.notifees:
nursery.start_soon(notifier, notifee)
# Backward compatibility properties
@property
def connections_legacy(self) -> dict[ID, INetConn]:
"""
Legacy 1:1 mapping for backward compatibility.
Returns
-------
dict[ID, INetConn]
Legacy mapping with only the first connection per peer.
"""
legacy_conns = {}
for peer_id, conns in self.connections.items():
if conns:
legacy_conns[peer_id] = conns[0]
return legacy_conns
raise NotImplementedError

276
libp2p/peer/envelope.py
View File

@ -1,276 +0,0 @@
from typing import Any, cast
import multiaddr
from libp2p.crypto.ed25519 import Ed25519PublicKey
from libp2p.crypto.keys import PrivateKey, PublicKey
from libp2p.crypto.rsa import RSAPublicKey
from libp2p.crypto.secp256k1 import Secp256k1PublicKey
import libp2p.peer.pb.crypto_pb2 as cryto_pb
import libp2p.peer.pb.envelope_pb2 as pb
import libp2p.peer.pb.peer_record_pb2 as record_pb
from libp2p.peer.peer_record import (
PeerRecord,
peer_record_from_protobuf,
unmarshal_record,
)
from libp2p.utils.varint import encode_uvarint
ENVELOPE_DOMAIN = "libp2p-peer-record"
PEER_RECORD_CODEC = b"\x03\x01"
class Envelope:
"""
A signed wrapper around a serialized libp2p record.
Envelopes are cryptographically signed by the author's private key
and are scoped to a specific 'domain' to prevent cross-protocol replay.
Attributes:
public_key: The public key that can verify the envelope's signature.
payload_type: A multicodec code identifying the type of payload inside.
raw_payload: The raw serialized record data.
signature: Signature over the domain-scoped payload content.
"""
public_key: PublicKey
payload_type: bytes
raw_payload: bytes
signature: bytes
_cached_record: PeerRecord | None = None
_unmarshal_error: Exception | None = None
def __init__(
self,
public_key: PublicKey,
payload_type: bytes,
raw_payload: bytes,
signature: bytes,
):
self.public_key = public_key
self.payload_type = payload_type
self.raw_payload = raw_payload
self.signature = signature
def marshal_envelope(self) -> bytes:
"""
Serialize this Envelope into its protobuf wire format.
Converts all envelope fields into a `pb.Envelope` protobuf message
and returns the serialized bytes.
:return: Serialized envelope as bytes.
"""
pb_env = pb.Envelope(
public_key=pub_key_to_protobuf(self.public_key),
payload_type=self.payload_type,
payload=self.raw_payload,
signature=self.signature,
)
return pb_env.SerializeToString()
def validate(self, domain: str) -> None:
"""
Verify the envelope's signature within the given domain scope.
This ensures that the envelope has not been tampered with
and was signed under the correct usage context.
:param domain: Domain string that contextualizes the signature.
:raises ValueError: If the signature is invalid.
"""
unsigned = make_unsigned(domain, self.payload_type, self.raw_payload)
if not self.public_key.verify(unsigned, self.signature):
raise ValueError("Invalid envelope signature")
def record(self) -> PeerRecord:
"""
Lazily decode and return the embedded PeerRecord.
This method unmarshals the payload bytes into a `PeerRecord` instance,
using the registered codec to identify the type. The decoded result
is cached for future use.
:return: Decoded PeerRecord object.
:raises Exception: If decoding fails or payload type is unsupported.
"""
if self._cached_record is not None:
return self._cached_record
try:
if self.payload_type != PEER_RECORD_CODEC:
raise ValueError("Unsuported payload type in envelope")
msg = record_pb.PeerRecord()
msg.ParseFromString(self.raw_payload)
self._cached_record = peer_record_from_protobuf(msg)
return self._cached_record
except Exception as e:
self._unmarshal_error = e
raise
def equal(self, other: Any) -> bool:
"""
Compare this Envelope with another for structural equality.
Two envelopes are considered equal if:
- They have the same public key
- The payload type and payload bytes match
- Their signatures are identical
:param other: Another object to compare.
:return: True if equal, False otherwise.
"""
if isinstance(other, Envelope):
return (
self.public_key.__eq__(other.public_key)
and self.payload_type == other.payload_type
and self.signature == other.signature
and self.raw_payload == other.raw_payload
)
return False
def _env_addrs_set(self) -> set[multiaddr.Multiaddr]:
return {b for b in self.record().addrs}
def pub_key_to_protobuf(pub_key: PublicKey) -> cryto_pb.PublicKey:
"""
Convert a Python PublicKey object to its protobuf equivalent.
:param pub_key: A libp2p-compatible PublicKey instance.
:return: Serialized protobuf PublicKey message.
"""
internal_key_type = pub_key.get_type()
key_type = cast(cryto_pb.KeyType, internal_key_type.value)
data = pub_key.to_bytes()
protobuf_key = cryto_pb.PublicKey(Type=key_type, Data=data)
return protobuf_key
def pub_key_from_protobuf(pb_key: cryto_pb.PublicKey) -> PublicKey:
"""
Parse a protobuf PublicKey message into a native libp2p PublicKey.
Supports Ed25519, RSA, and Secp256k1 key types.
:param pb_key: Protobuf representation of a public key.
:return: Parsed PublicKey object.
:raises ValueError: If the key type is unrecognized.
"""
if pb_key.Type == cryto_pb.KeyType.Ed25519:
return Ed25519PublicKey.from_bytes(pb_key.Data)
elif pb_key.Type == cryto_pb.KeyType.RSA:
return RSAPublicKey.from_bytes(pb_key.Data)
elif pb_key.Type == cryto_pb.KeyType.Secp256k1:
return Secp256k1PublicKey.from_bytes(pb_key.Data)
# libp2p.crypto.ecdsa not implemented
else:
raise ValueError(f"Unknown key type: {pb_key.Type}")
def seal_record(record: PeerRecord, private_key: PrivateKey) -> Envelope:
"""
Create and sign a new Envelope from a PeerRecord.
The record is serialized and signed in the scope of its domain and codec.
The result is a self-contained, verifiable Envelope.
:param record: A PeerRecord to encapsulate.
:param private_key: The signer's private key.
:return: A signed Envelope instance.
"""
payload = record.marshal_record()
unsigned = make_unsigned(record.domain(), record.codec(), payload)
signature = private_key.sign(unsigned)
return Envelope(
public_key=private_key.get_public_key(),
payload_type=record.codec(),
raw_payload=payload,
signature=signature,
)
def consume_envelope(data: bytes, domain: str) -> tuple[Envelope, PeerRecord]:
"""
Parse, validate, and decode an Envelope from bytes.
Validates the envelope's signature using the given domain and decodes
the inner payload into a PeerRecord.
:param data: Serialized envelope bytes.
:param domain: Domain string to verify signature against.
:return: Tuple of (Envelope, PeerRecord).
:raises ValueError: If signature validation or decoding fails.
"""
env = unmarshal_envelope(data)
env.validate(domain)
record = env.record()
return env, record
def unmarshal_envelope(data: bytes) -> Envelope:
"""
Deserialize an Envelope from its wire format.
This parses the protobuf fields without verifying the signature.
:param data: Serialized envelope bytes.
:return: Parsed Envelope object.
:raises DecodeError: If protobuf parsing fails.
"""
pb_env = pb.Envelope()
pb_env.ParseFromString(data)
pk = pub_key_from_protobuf(pb_env.public_key)
return Envelope(
public_key=pk,
payload_type=pb_env.payload_type,
raw_payload=pb_env.payload,
signature=pb_env.signature,
)
def make_unsigned(domain: str, payload_type: bytes, payload: bytes) -> bytes:
"""
Build a byte buffer to be signed for an Envelope.
The unsigned byte structure is:
varint(len(domain)) || domain ||
varint(len(payload_type)) || payload_type ||
varint(len(payload)) || payload
This is the exact input used during signing and verification.
:param domain: Domain string for signature scoping.
:param payload_type: Identifier for the type of payload.
:param payload: Raw serialized payload bytes.
:return: Byte buffer to be signed or verified.
"""
fields = [domain.encode(), payload_type, payload]
buf = bytearray()
for field in fields:
buf.extend(encode_uvarint(len(field)))
buf.extend(field)
return bytes(buf)
def debug_dump_envelope(env: Envelope) -> None:
print("\n=== Envelope ===")
print(f"Payload Type: {env.payload_type!r}")
print(f"Signature: {env.signature.hex()} ({len(env.signature)} bytes)")
print(f"Raw Payload: {env.raw_payload.hex()} ({len(env.raw_payload)} bytes)")
try:
peer_record = unmarshal_record(env.raw_payload)
print("\n=== Parsed PeerRecord ===")
print(peer_record)
except Exception as e:
print("Failed to parse PeerRecord:", e)

17
libp2p/peer/id.py
View File

@ -1,4 +1,3 @@
import functools
import hashlib
import base58
@ -37,23 +36,25 @@ if ENABLE_INLINING:
class ID:
_bytes: bytes
_xor_id: int | None = None
_b58_str: str | None = None
def __init__(self, peer_id_bytes: bytes) -> None:
self._bytes = peer_id_bytes
@functools.cached_property
@property
def xor_id(self) -> int:
return int(sha256_digest(self._bytes).hex(), 16)
@functools.cached_property
def base58(self) -> str:
return base58.b58encode(self._bytes).decode()
if not self._xor_id:
self._xor_id = int(sha256_digest(self._bytes).hex(), 16)
return self._xor_id
def to_bytes(self) -> bytes:
return self._bytes
def to_base58(self) -> str:
return self.base58
if not self._b58_str:
self._b58_str = base58.b58encode(self._bytes).decode()
return self._b58_str
def __repr__(self) -> str:
return f"<libp2p.peer.id.ID ({self!s})>"

22
libp2p/peer/pb/crypto.proto
View File

@ -1,22 +0,0 @@
syntax = "proto3";
package libp2p.peer.pb.crypto;
option go_package = "github.com/libp2p/go-libp2p/core/crypto/pb";
enum KeyType {
RSA = 0;
Ed25519 = 1;
Secp256k1 = 2;
ECDSA = 3;
}
message PublicKey {
KeyType Type = 1;
bytes Data = 2;
}
message PrivateKey {
KeyType Type = 1;
bytes Data = 2;
}

31
libp2p/peer/pb/crypto_pb2.py
View File

@ -1,31 +0,0 @@
# -*- coding: utf-8 -*-
# Generated by the protocol buffer compiler. DO NOT EDIT!
# source: libp2p/peer/pb/crypto.proto
# Protobuf Python Version: 4.25.3
"""Generated protocol buffer code."""
from google.protobuf import descriptor as _descriptor
from google.protobuf import descriptor_pool as _descriptor_pool
from google.protobuf import symbol_database as _symbol_database
from google.protobuf.internal import builder as _builder
# @@protoc_insertion_point(imports)
_sym_db = _symbol_database.Default()
DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x1blibp2p/peer/pb/crypto.proto\x12\x15libp2p.peer.pb.crypto\"G\n\tPublicKey\x12,\n\x04Type\x18\x01 \x01(\x0e\x32\x1e.libp2p.peer.pb.crypto.KeyType\x12\x0c\n\x04\x44\x61ta\x18\x02 \x01(\x0c\"H\n\nPrivateKey\x12,\n\x04Type\x18\x01 \x01(\x0e\x32\x1e.libp2p.peer.pb.crypto.KeyType\x12\x0c\n\x04\x44\x61ta\x18\x02 \x01(\x0c*9\n\x07KeyType\x12\x07\n\x03RSA\x10\x00\x12\x0b\n\x07\x45\x64\x32\x35\x35\x31\x39\x10\x01\x12\r\n\tSecp256k1\x10\x02\x12\t\n\x05\x45\x43\x44SA\x10\x03\x42,Z*github.com/libp2p/go-libp2p/core/crypto/pbb\x06proto3')
_globals = globals()
_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, _globals)
_builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'libp2p.peer.pb.crypto_pb2', _globals)
if _descriptor._USE_C_DESCRIPTORS == False:
_globals['DESCRIPTOR']._options = None
_globals['DESCRIPTOR']._serialized_options = b'Z*github.com/libp2p/go-libp2p/core/crypto/pb'
_globals['_KEYTYPE']._serialized_start=201
_globals['_KEYTYPE']._serialized_end=258
_globals['_PUBLICKEY']._serialized_start=54
_globals['_PUBLICKEY']._serialized_end=125
_globals['_PRIVATEKEY']._serialized_start=127
_globals['_PRIVATEKEY']._serialized_end=199
# @@protoc_insertion_point(module_scope)

33
libp2p/peer/pb/crypto_pb2.pyi
View File

@ -1,33 +0,0 @@
from google.protobuf.internal import enum_type_wrapper as _enum_type_wrapper
from google.protobuf import descriptor as _descriptor
from google.protobuf import message as _message
from typing import ClassVar as _ClassVar, Optional as _Optional, Union as _Union
DESCRIPTOR: _descriptor.FileDescriptor
class KeyType(int, metaclass=_enum_type_wrapper.EnumTypeWrapper):
__slots__ = ()
RSA: _ClassVar[KeyType]
Ed25519: _ClassVar[KeyType]
Secp256k1: _ClassVar[KeyType]
ECDSA: _ClassVar[KeyType]
RSA: KeyType
Ed25519: KeyType
Secp256k1: KeyType
ECDSA: KeyType
class PublicKey(_message.Message):
__slots__ = ("Type", "Data")
TYPE_FIELD_NUMBER: _ClassVar[int]
DATA_FIELD_NUMBER: _ClassVar[int]
Type: KeyType
Data: bytes
def __init__(self, Type: _Optional[_Union[KeyType, str]] = ..., Data: _Optional[bytes] = ...) -> None: ...
class PrivateKey(_message.Message):
__slots__ = ("Type", "Data")
TYPE_FIELD_NUMBER: _ClassVar[int]
DATA_FIELD_NUMBER: _ClassVar[int]
Type: KeyType
Data: bytes
def __init__(self, Type: _Optional[_Union[KeyType, str]] = ..., Data: _Optional[bytes] = ...) -> None: ...

14
libp2p/peer/pb/envelope.proto
View File

@ -1,14 +0,0 @@
syntax = "proto3";
package libp2p.peer.pb.record;
import "libp2p/peer/pb/crypto.proto";
option go_package = "github.com/libp2p/go-libp2p/core/record/pb";
message Envelope {
libp2p.peer.pb.crypto.PublicKey public_key = 1;
bytes payload_type = 2;
bytes payload = 3;
bytes signature = 5;
}

28
libp2p/peer/pb/envelope_pb2.py
View File

@ -1,28 +0,0 @@
# -*- coding: utf-8 -*-
# Generated by the protocol buffer compiler. DO NOT EDIT!
# source: libp2p/peer/pb/envelope.proto
# Protobuf Python Version: 4.25.3
"""Generated protocol buffer code."""
from google.protobuf import descriptor as _descriptor
from google.protobuf import descriptor_pool as _descriptor_pool
from google.protobuf import symbol_database as _symbol_database
from google.protobuf.internal import builder as _builder
# @@protoc_insertion_point(imports)
_sym_db = _symbol_database.Default()
from libp2p.peer.pb import crypto_pb2 as libp2p_dot_peer_dot_pb_dot_crypto__pb2
DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x1dlibp2p/peer/pb/envelope.proto\x12\x15libp2p.peer.pb.record\x1a\x1blibp2p/peer/pb/crypto.proto\"z\n\x08\x45nvelope\x12\x34\n\npublic_key\x18\x01 \x01(\x0b\x32 .libp2p.peer.pb.crypto.PublicKey\x12\x14\n\x0cpayload_type\x18\x02 \x01(\x0c\x12\x0f\n\x07payload\x18\x03 \x01(\x0c\x12\x11\n\tsignature\x18\x05 \x01(\x0c\x42,Z*github.com/libp2p/go-libp2p/core/record/pbb\x06proto3')
_globals = globals()
_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, _globals)
_builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'libp2p.peer.pb.envelope_pb2', _globals)
if _descriptor._USE_C_DESCRIPTORS == False:
_globals['DESCRIPTOR']._options = None
_globals['DESCRIPTOR']._serialized_options = b'Z*github.com/libp2p/go-libp2p/core/record/pb'
_globals['_ENVELOPE']._serialized_start=85
_globals['_ENVELOPE']._serialized_end=207
# @@protoc_insertion_point(module_scope)

18
libp2p/peer/pb/envelope_pb2.pyi
View File

@ -1,18 +0,0 @@
from libp2p.peer.pb import crypto_pb2 as _crypto_pb2
from google.protobuf import descriptor as _descriptor
from google.protobuf import message as _message
from typing import ClassVar as _ClassVar, Mapping as _Mapping, Optional as _Optional, Union as _Union
DESCRIPTOR: _descriptor.FileDescriptor
class Envelope(_message.Message):
__slots__ = ("public_key", "payload_type", "payload", "signature")
PUBLIC_KEY_FIELD_NUMBER: _ClassVar[int]
PAYLOAD_TYPE_FIELD_NUMBER: _ClassVar[int]
PAYLOAD_FIELD_NUMBER: _ClassVar[int]
SIGNATURE_FIELD_NUMBER: _ClassVar[int]
public_key: _crypto_pb2.PublicKey
payload_type: bytes
payload: bytes
signature: bytes
def __init__(self, public_key: _Optional[_Union[_crypto_pb2.PublicKey, _Mapping]] = ..., payload_type: _Optional[bytes] = ..., payload: _Optional[bytes] = ..., signature: _Optional[bytes] = ...) -> None: ... # type: ignore[type-arg]

31
libp2p/peer/pb/peer_record.proto
View File

@ -1,31 +0,0 @@
syntax = "proto3";
package peer.pb;
option go_package = "github.com/libp2p/go-libp2p/core/peer/pb";
// PeerRecord messages contain information that is useful to share with other peers.
// Currently, a PeerRecord contains the public listen addresses for a peer, but this
// is expected to expand to include other information in the future.
//
// PeerRecords are designed to be serialized to bytes and placed inside of
// SignedEnvelopes before sharing with other peers.
// See https://github.com/libp2p/go-libp2p/blob/master/core/record/pb/envelope.proto for
// the SignedEnvelope definition.
message PeerRecord {
// AddressInfo is a wrapper around a binary multiaddr. It is defined as a
// separate message to allow us to add per-address metadata in the future.
message AddressInfo {
bytes multiaddr = 1;
}
// peer_id contains a libp2p peer id in its binary representation.
bytes peer_id = 1;
// seq contains a monotonically-increasing sequence counter to order PeerRecords in time.
uint64 seq = 2;
// addresses is a list of public listen addresses for the peer.
repeated AddressInfo addresses = 3;
}

29
libp2p/peer/pb/peer_record_pb2.py
View File

@ -1,29 +0,0 @@
# -*- coding: utf-8 -*-
# Generated by the protocol buffer compiler. DO NOT EDIT!
# source: libp2p/peer/pb/peer_record.proto
# Protobuf Python Version: 4.25.3
"""Generated protocol buffer code."""
from google.protobuf import descriptor as _descriptor
from google.protobuf import descriptor_pool as _descriptor_pool
from google.protobuf import symbol_database as _symbol_database
from google.protobuf.internal import builder as _builder
# @@protoc_insertion_point(imports)
_sym_db = _symbol_database.Default()
DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n libp2p/peer/pb/peer_record.proto\x12\x07peer.pb\"\x80\x01\n\nPeerRecord\x12\x0f\n\x07peer_id\x18\x01 \x01(\x0c\x12\x0b\n\x03seq\x18\x02 \x01(\x04\x12\x32\n\taddresses\x18\x03 \x03(\x0b\x32\x1f.peer.pb.PeerRecord.AddressInfo\x1a \n\x0b\x41\x64\x64ressInfo\x12\x11\n\tmultiaddr\x18\x01 \x01(\x0c\x42*Z(github.com/libp2p/go-libp2p/core/peer/pbb\x06proto3')
_globals = globals()
_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, _globals)
_builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'libp2p.peer.pb.peer_record_pb2', _globals)
if _descriptor._USE_C_DESCRIPTORS == False:
_globals['DESCRIPTOR']._options = None
_globals['DESCRIPTOR']._serialized_options = b'Z(github.com/libp2p/go-libp2p/core/peer/pb'
_globals['_PEERRECORD']._serialized_start=46
_globals['_PEERRECORD']._serialized_end=174
_globals['_PEERRECORD_ADDRESSINFO']._serialized_start=142
_globals['_PEERRECORD_ADDRESSINFO']._serialized_end=174
# @@protoc_insertion_point(module_scope)

21
libp2p/peer/pb/peer_record_pb2.pyi
View File

@ -1,21 +0,0 @@
from google.protobuf.internal import containers as _containers
from google.protobuf import descriptor as _descriptor
from google.protobuf import message as _message
from typing import ClassVar as _ClassVar, Iterable as _Iterable, Mapping as _Mapping, Optional as _Optional, Union as _Union
DESCRIPTOR: _descriptor.FileDescriptor
class PeerRecord(_message.Message):
__slots__ = ("peer_id", "seq", "addresses")
class AddressInfo(_message.Message):
__slots__ = ("multiaddr",)
MULTIADDR_FIELD_NUMBER: _ClassVar[int]
multiaddr: bytes
def __init__(self, multiaddr: _Optional[bytes] = ...) -> None: ...
PEER_ID_FIELD_NUMBER: _ClassVar[int]
SEQ_FIELD_NUMBER: _ClassVar[int]
ADDRESSES_FIELD_NUMBER: _ClassVar[int]
peer_id: bytes
seq: int
addresses: _containers.RepeatedCompositeFieldContainer[PeerRecord.AddressInfo]
def __init__(self, peer_id: _Optional[bytes] = ..., seq: _Optional[int] = ..., addresses: _Optional[_Iterable[_Union[PeerRecord.AddressInfo, _Mapping]]] = ...) -> None: ... # type: ignore[type-arg]

251
libp2p/peer/peer_record.py
View File

@ -1,251 +0,0 @@
from collections.abc import Sequence
import threading
import time
from typing import Any
from multiaddr import Multiaddr
from libp2p.abc import IPeerRecord
from libp2p.peer.id import ID
import libp2p.peer.pb.peer_record_pb2 as pb
from libp2p.peer.peerinfo import PeerInfo
PEER_RECORD_ENVELOPE_DOMAIN = "libp2p-peer-record"
PEER_RECORD_ENVELOPE_PAYLOAD_TYPE = b"\x03\x01"
_last_timestamp_lock = threading.Lock()
_last_timestamp: int = 0
class PeerRecord(IPeerRecord):
"""
A record that contains metatdata about a peer in the libp2p network.
This includes:
- `peer_id`: The peer's globally unique indentifier.
- `addrs`: A list of the peer's publicly reachable multiaddrs.
- `seq`: A strictly monotonically increasing timestamp used
to order records over time.
PeerRecords are designed to be signed and transmitted in libp2p routing Envelopes.
"""
peer_id: ID
addrs: list[Multiaddr]
seq: int
def __init__(
self,
peer_id: ID | None = None,
addrs: list[Multiaddr] | None = None,
seq: int | None = None,
) -> None:
"""
Initialize a new PeerRecord.
If `seq` is not provided, a timestamp-based strictly increasing sequence
number will be generated.
:param peer_id: ID of the peer this record refers to.
:param addrs: Public multiaddrs of the peer.
:param seq: Monotonic sequence number.
"""
if peer_id is not None:
self.peer_id = peer_id
self.addrs = addrs or []
if seq is not None:
self.seq = seq
else:
self.seq = timestamp_seq()
def __repr__(self) -> str:
return (
f"PeerRecord(\n"
f" peer_id={self.peer_id},\n"
f" multiaddrs={[str(m) for m in self.addrs]},\n"
f" seq={self.seq}\n"
f")"
)
def domain(self) -> str:
"""
Return the domain string associated with this PeerRecord.
Used during record signing and envelope validation to identify the record type.
"""
return PEER_RECORD_ENVELOPE_DOMAIN
def codec(self) -> bytes:
"""
Return the codec identifier for PeerRecords.
This binary perfix helps distinguish PeerRecords in serialized envelopes.
"""
return PEER_RECORD_ENVELOPE_PAYLOAD_TYPE
def to_protobuf(self) -> pb.PeerRecord:
"""
Convert the current PeerRecord into a ProtoBuf PeerRecord message.
:raises ValueError: if peer_id serialization fails.
:return: A ProtoBuf-encoded PeerRecord message object.
"""
try:
id_bytes = self.peer_id.to_bytes()
except Exception as e:
raise ValueError(f"failed to marshal peer_id: {e}")
msg = pb.PeerRecord()
msg.peer_id = id_bytes
msg.seq = self.seq
msg.addresses.extend(addrs_to_protobuf(self.addrs))
return msg
def marshal_record(self) -> bytes:
"""
Serialize a PeerRecord into raw bytes suitable for embedding in an Envelope.
This is typically called during the process of signing or sealing the record.
:raises ValueError: if serialization to protobuf fails.
:return: Serialized PeerRecord bytes.
"""
try:
msg = self.to_protobuf()
return msg.SerializeToString()
except Exception as e:
raise ValueError(f"failed to marshal PeerRecord: {e}")
def equal(self, other: Any) -> bool:
"""
Check if this PeerRecord is identical to another.
Two PeerRecords are considered equal if:
- Their peer IDs match.
- Their sequence numbers are identical.
- Their address lists are identical and in the same order.
:param other: Another PeerRecord instance.
:return: True if all fields mathch, False otherwise.
"""
if isinstance(other, PeerRecord):
if self.peer_id == other.peer_id:
if self.seq == other.seq:
if len(self.addrs) == len(other.addrs):
for a1, a2 in zip(self.addrs, other.addrs):
if a1 == a2:
continue
else:
return False
return True
return False
def unmarshal_record(data: bytes) -> PeerRecord:
"""
Deserialize a PeerRecord from its serialized byte representation.
Typically used when receiveing a PeerRecord inside a signed routing Envelope.
:param data: Serialized protobuf-encoded bytes.
:raises ValueError: if parsing or conversion fails.
:reurn: A valid PeerRecord instance.
"""
if data is None:
raise ValueError("cannot unmarshal PeerRecord from None")
msg = pb.PeerRecord()
try:
msg.ParseFromString(data)
except Exception as e:
raise ValueError(f"Failed to parse PeerRecord protobuf: {e}")
try:
record = peer_record_from_protobuf(msg)
except Exception as e:
raise ValueError(f"Failed to convert protobuf to PeerRecord: {e}")
return record
def timestamp_seq() -> int:
"""
Generate a strictly increasing timestamp-based sequence number.
Ensures that even if multiple PeerRecords are generated in the same nanosecond,
their `seq` values will still be strictly increasing by using a lock to track the
last value.
:return: A strictly increasing integer timestamp.
"""
global _last_timestamp
now = int(time.time_ns())
with _last_timestamp_lock:
if now <= _last_timestamp:
now = _last_timestamp + 1
_last_timestamp = now
return now
def peer_record_from_peer_info(info: PeerInfo) -> PeerRecord:
"""
Create a PeerRecord from a PeerInfo object.
This automatically assigns a timestamp-based sequence number to the record.
:param info: A PeerInfo instance (contains peer_id and addrs).
:return: A PeerRecord instance.
"""
record = PeerRecord()
record.peer_id = info.peer_id
record.addrs = info.addrs
return record
def peer_record_from_protobuf(msg: pb.PeerRecord) -> PeerRecord:
"""
Convert a protobuf PeerRecord message into a PeerRecord object.
:param msg: Protobuf PeerRecord message.
:raises ValueError: if the peer_id cannot be parsed.
:return: A deserialized PeerRecord instance.
"""
try:
peer_id = ID(msg.peer_id)
except Exception as e:
raise ValueError(f"Failed to unmarshal peer_id: {e}")
addrs = addrs_from_protobuf(msg.addresses)
seq = msg.seq
return PeerRecord(peer_id, addrs, seq)
def addrs_from_protobuf(addrs: Sequence[pb.PeerRecord.AddressInfo]) -> list[Multiaddr]:
"""
Convert a list of protobuf address records to Multiaddr objects.
:param addrs: A list of protobuf PeerRecord.AddressInfo messages.
:return: A list of decoded Multiaddr instances (invalid ones are skipped).
"""
out = []
for addr_info in addrs:
try:
addr = Multiaddr(addr_info.multiaddr)
out.append(addr)
except Exception:
continue
return out
def addrs_to_protobuf(addrs: list[Multiaddr]) -> list[pb.PeerRecord.AddressInfo]:
"""
Convert a list of Multiaddr objects into their protobuf representation.
:param addrs: A list of Multiaddr instances.
:return: A list of PeerRecord.AddressInfo protobuf messages.
"""
out = []
for addr in addrs:
addr_info = pb.PeerRecord.AddressInfo()
addr_info.multiaddr = addr.to_bytes()
out.append(addr_info)
return out

80
libp2p/peer/peerdata.py
View File

@ -18,13 +18,6 @@ from libp2p.crypto.keys import (
PublicKey,
)
"""
Latency EWMA Smoothing governs the deacy of the EWMA (the speed at which
is changes). This must be a normalized (0-1) value.
1 is 100% change, 0 is no change.
"""
LATENCY_EWMA_SMOOTHING = 0.1
class PeerData(IPeerData):
pubkey: PublicKey | None
@ -34,7 +27,6 @@ class PeerData(IPeerData):
addrs: list[Multiaddr]
last_identified: int
ttl: int # Keep ttl=0 by default for always valid
latmap: float
def __init__(self) -> None:
self.pubkey = None
@ -44,9 +36,6 @@ class PeerData(IPeerData):
self.addrs = []
self.last_identified = int(time.time())
self.ttl = 0
self.latmap = 0
# --------PROTO-BOOK--------
def get_protocols(self) -> list[str]:
"""
@ -66,37 +55,6 @@ class PeerData(IPeerData):
"""
self.protocols = list(protocols)
def remove_protocols(self, protocols: Sequence[str]) -> None:
"""
:param protocols: protocols to remove
"""
for protocol in protocols:
if protocol in self.protocols:
self.protocols.remove(protocol)
def supports_protocols(self, protocols: Sequence[str]) -> list[str]:
"""
:param protocols: protocols to check from
:return: all supported protocols in the given list
"""
return [proto for proto in protocols if proto in self.protocols]
def first_supported_protocol(self, protocols: Sequence[str]) -> str:
"""
:param protocols: protocols to check from
:return: first supported protocol in the given list
"""
for protocol in protocols:
if protocol in self.protocols:
return protocol
return "None supported"
def clear_protocol_data(self) -> None:
"""Clear all protocols"""
self.protocols = []
# -------ADDR-BOOK---------
def add_addrs(self, addrs: Sequence[Multiaddr]) -> None:
"""
:param addrs: multiaddresses to add
@ -115,7 +73,6 @@ class PeerData(IPeerData):
"""Clear all addresses."""
self.addrs = []
# -------METADATA-----------
def put_metadata(self, key: str, val: Any) -> None:
"""
:param key: key in KV pair
@ -133,11 +90,6 @@ class PeerData(IPeerData):
return self.metadata[key]
raise PeerDataError("key not found")
def clear_metadata(self) -> None:
"""Clears metadata."""
self.metadata = {}
# -------KEY-BOOK---------------
def add_pubkey(self, pubkey: PublicKey) -> None:
"""
:param pubkey:
@ -168,41 +120,9 @@ class PeerData(IPeerData):
raise PeerDataError("private key not found")
return self.privkey
def clear_keydata(self) -> None:
"""Clears keydata"""
self.pubkey = None
self.privkey = None
# ----------METRICS--------------
def record_latency(self, new_latency: float) -> None:
"""
Records a new latency measurement for the given peer
using Exponentially Weighted Moving Average (EWMA)
:param new_latency: the new latency value
"""
s = LATENCY_EWMA_SMOOTHING
if s > 1 or s < 0:
s = 0.1
if self.latmap == 0:
self.latmap = new_latency
else:
prev = self.latmap
updated = ((1.0 - s) * prev) + (s * new_latency)
self.latmap = updated
def latency_EWMA(self) -> float:
"""Returns the latency EWMA value"""
return self.latmap
def clear_metrics(self) -> None:
"""Clear the latency metrics"""
self.latmap = 0
def update_last_identified(self) -> None:
self.last_identified = int(time.time())
# ----------TTL------------------
def get_last_identified(self) -> int:
"""
:return: last identified timestamp

23
libp2p/peer/peerinfo.py
View File

@ -3,11 +3,9 @@ from collections.abc import (
)
from typing import (
Any,
cast,
)
import multiaddr
from multiaddr.protocols import Protocol
from .id import (
ID,
@ -44,8 +42,7 @@ def info_from_p2p_addr(addr: multiaddr.Multiaddr) -> PeerInfo:
p2p_protocols = p2p_part.protocols()
if not p2p_protocols:
raise InvalidAddrError("The last part of the address has no protocols")
last_protocol = cast(Protocol, p2p_part.protocols()[0])
last_protocol = p2p_protocols[0]
if last_protocol is None:
raise InvalidAddrError("The last protocol is None")
@ -69,23 +66,5 @@ def info_from_p2p_addr(addr: multiaddr.Multiaddr) -> PeerInfo:
return PeerInfo(peer_id, [addr])
def peer_info_to_bytes(peer_info: PeerInfo) -> bytes:
lines = [str(peer_info.peer_id)] + [str(addr) for addr in peer_info.addrs]
return "\n".join(lines).encode("utf-8")
def peer_info_from_bytes(data: bytes) -> PeerInfo:
try:
lines = data.decode("utf-8").splitlines()
if not lines:
raise InvalidAddrError("no data to decode PeerInfo")
peer_id = ID.from_base58(lines[0])
addrs = [multiaddr.Multiaddr(addr_str) for addr_str in lines[1:]]
return PeerInfo(peer_id, addrs)
except Exception as e:
raise InvalidAddrError(f"failed to decode PeerInfo: {e}")
class InvalidAddrError(ValueError):
pass

364
libp2p/peer/peerstore.py
View File

@ -2,7 +2,6 @@ from collections import (
defaultdict,
)
from collections.abc import (
AsyncIterable,
Sequence,
)
from typing import (
@ -12,11 +11,8 @@ from typing import (
from multiaddr import (
Multiaddr,
)
import trio
from trio import MemoryReceiveChannel, MemorySendChannel
from libp2p.abc import (
IHost,
IPeerStore,
)
from libp2p.crypto.keys import (
@ -24,8 +20,6 @@ from libp2p.crypto.keys import (
PrivateKey,
PublicKey,
)
from libp2p.peer.envelope import Envelope, seal_record
from libp2p.peer.peer_record import PeerRecord
from .id import (
ID,
@ -41,112 +35,11 @@ from .peerinfo import (
PERMANENT_ADDR_TTL = 0
def create_signed_peer_record(
peer_id: ID, addrs: list[Multiaddr], pvt_key: PrivateKey
) -> Envelope:
"""Creates a signed_peer_record wrapped in an Envelope"""
record = PeerRecord(peer_id, addrs)
envelope = seal_record(record, pvt_key)
return envelope
def env_to_send_in_RPC(host: IHost) -> tuple[bytes, bool]:
"""
Return the signed peer record (Envelope) to be sent in an RPC.
This function checks whether the host already has a cached signed peer record
(SPR). If one exists and its addresses match the host's current listen
addresses, the cached envelope is reused. Otherwise, a new signed peer record
is created, cached, and returned.
Parameters
----------
host : IHost
The local host instance, providing access to peer ID, listen addresses,
private key, and the peerstore.
Returns
-------
tuple[bytes, bool]
A 2-tuple where the first element is the serialized envelope (bytes)
for the signed peer record, and the second element is a boolean flag
indicating whether a new record was created (True) or an existing cached
one was reused (False).
"""
listen_addrs_set = {addr for addr in host.get_addrs()}
local_env = host.get_peerstore().get_local_record()
if local_env is None:
# No cached SPR yet -> create one
return issue_and_cache_local_record(host), True
else:
record_addrs_set = local_env._env_addrs_set()
if record_addrs_set == listen_addrs_set:
# Perfect match -> reuse cached envelope
return local_env.marshal_envelope(), False
else:
# Addresses changed -> issue a new SPR and cache it
return issue_and_cache_local_record(host), True
def issue_and_cache_local_record(host: IHost) -> bytes:
"""
Create and cache a new signed peer record (Envelope) for the host.
This function generates a new signed peer record from the host’s peer ID,
listen addresses, and private key. The resulting envelope is stored in
the peerstore as the local record for future reuse.
Parameters
----------
host : IHost
The local host instance, providing access to peer ID, listen addresses,
private key, and the peerstore.
Returns
-------
bytes
The serialized envelope (bytes) representing the newly created signed
peer record.
"""
env = create_signed_peer_record(
host.get_id(),
host.get_addrs(),
host.get_private_key(),
)
# Cache it for next time use
host.get_peerstore().set_local_record(env)
return env.marshal_envelope()
class PeerRecordState:
envelope: Envelope
seq: int
def __init__(self, envelope: Envelope, seq: int):
self.envelope = envelope
self.seq = seq
class PeerStore(IPeerStore):
peer_data_map: dict[ID, PeerData]
def __init__(self, max_records: int = 10000) -> None:
def __init__(self) -> None:
self.peer_data_map = defaultdict(PeerData)
self.addr_update_channels: dict[ID, MemorySendChannel[Multiaddr]] = {}
self.peer_record_map: dict[ID, PeerRecordState] = {}
self.local_peer_record: Envelope | None = None
self.max_records = max_records
def get_local_record(self) -> Envelope | None:
"""Get the local-signed-record wrapped in Envelope"""
return self.local_peer_record
def set_local_record(self, envelope: Envelope) -> None:
"""Set the local-signed-record wrapped in Envelope"""
self.local_peer_record = envelope
def peer_info(self, peer_id: ID) -> PeerInfo:
"""
@ -160,69 +53,6 @@ class PeerStore(IPeerStore):
return PeerInfo(peer_id, peer_data.get_addrs())
raise PeerStoreError("peer ID not found")
def peer_ids(self) -> list[ID]:
"""
:return: all of the peer IDs stored in peer store
"""
return list(self.peer_data_map.keys())
def clear_peerdata(self, peer_id: ID) -> None:
"""Clears all data associated with the given peer_id."""
if peer_id in self.peer_data_map:
del self.peer_data_map[peer_id]
else:
raise PeerStoreError("peer ID not found")
# Clear the peer records
if peer_id in self.peer_record_map:
self.peer_record_map.pop(peer_id, None)
def valid_peer_ids(self) -> list[ID]:
"""
:return: all of the valid peer IDs stored in peer store
"""
valid_peer_ids: list[ID] = []
for peer_id, peer_data in self.peer_data_map.items():
if not peer_data.is_expired():
valid_peer_ids.append(peer_id)
else:
peer_data.clear_addrs()
return valid_peer_ids
def _enforce_record_limit(self) -> None:
"""Enforce maximum number of stored records."""
if len(self.peer_record_map) > self.max_records:
# Record oldest records based on seequence number
sorted_records = sorted(
self.peer_record_map.items(), key=lambda x: x[1].seq
)
records_to_remove = len(self.peer_record_map) - self.max_records
for peer_id, _ in sorted_records[:records_to_remove]:
self.maybe_delete_peer_record(peer_id)
del self.peer_record_map[peer_id]
async def start_cleanup_task(self, cleanup_interval: int = 3600) -> None:
"""Start periodic cleanup of expired peer records and addresses."""
while True:
await trio.sleep(cleanup_interval)
self._cleanup_expired_records()
def _cleanup_expired_records(self) -> None:
"""Remove expired peer records and addresses"""
expired_peers = []
for peer_id, peer_data in self.peer_data_map.items():
if peer_data.is_expired():
expired_peers.append(peer_id)
for peer_id in expired_peers:
self.maybe_delete_peer_record(peer_id)
del self.peer_data_map[peer_id]
self._enforce_record_limit()
# --------PROTO-BOOK--------
def get_protocols(self, peer_id: ID) -> list[str]:
"""
:param peer_id: peer ID to get protocols for
@ -249,31 +79,23 @@ class PeerStore(IPeerStore):
peer_data = self.peer_data_map[peer_id]
peer_data.set_protocols(list(protocols))
def remove_protocols(self, peer_id: ID, protocols: Sequence[str]) -> None:
"""
:param peer_id: peer ID to get info for
:param protocols: unsupported protocols to remove
"""
peer_data = self.peer_data_map[peer_id]
peer_data.remove_protocols(protocols)
def supports_protocols(self, peer_id: ID, protocols: Sequence[str]) -> list[str]:
def peer_ids(self) -> list[ID]:
"""
:return: all of the peer IDs stored in peer store
"""
peer_data = self.peer_data_map[peer_id]
return peer_data.supports_protocols(protocols)
return list(self.peer_data_map.keys())
def first_supported_protocol(self, peer_id: ID, protocols: Sequence[str]) -> str:
peer_data = self.peer_data_map[peer_id]
return peer_data.first_supported_protocol(protocols)
def clear_protocol_data(self, peer_id: ID) -> None:
"""Clears prtocoldata"""
peer_data = self.peer_data_map[peer_id]
peer_data.clear_protocol_data()
# ------METADATA---------
def valid_peer_ids(self) -> list[ID]:
"""
:return: all of the valid peer IDs stored in peer store
"""
valid_peer_ids: list[ID] = []
for peer_id, peer_data in self.peer_data_map.items():
if not peer_data.is_expired():
valid_peer_ids.append(peer_id)
else:
peer_data.clear_addrs()
return valid_peer_ids
def get(self, peer_id: ID, key: str) -> Any:
"""
@ -299,91 +121,6 @@ class PeerStore(IPeerStore):
peer_data = self.peer_data_map[peer_id]
peer_data.put_metadata(key, val)
def clear_metadata(self, peer_id: ID) -> None:
"""Clears metadata"""
peer_data = self.peer_data_map[peer_id]
peer_data.clear_metadata()
# -----CERT-ADDR-BOOK-----
def maybe_delete_peer_record(self, peer_id: ID) -> None:
"""
Delete the signed peer record for a peer if it has no know
(non-expired) addresses.
This is a garbage collection mechanism: if all addresses for a peer have expired
or been cleared, there's no point holding onto its signed `Envelope`
:param peer_id: The peer whose record we may delete/
"""
if peer_id in self.peer_record_map:
if not self.addrs(peer_id):
self.peer_record_map.pop(peer_id, None)
def consume_peer_record(self, envelope: Envelope, ttl: int) -> bool:
"""
Accept and store a signed PeerRecord, unless it's older than
the one already stored.
This function:
- Extracts the peer ID and sequence number from the envelope
- Rejects the record if it's older (lower seq)
- Updates the stored peer record and replaces associated addresses if accepted
:param envelope: Signed envelope containing a PeerRecord.
:param ttl: Time-to-live for the included multiaddrs (in seconds).
:return: True if the record was accepted and stored; False if it was rejected.
"""
record = envelope.record()
peer_id = record.peer_id
existing = self.peer_record_map.get(peer_id)
if existing and existing.seq > record.seq:
return False # reject older record
new_addrs = set(record.addrs)
self.peer_record_map[peer_id] = PeerRecordState(envelope, record.seq)
self.peer_data_map[peer_id].clear_addrs()
self.add_addrs(peer_id, list(new_addrs), ttl)
return True
def consume_peer_records(self, envelopes: list[Envelope], ttl: int) -> list[bool]:
"""Consume multiple peer records in a single operation."""
results = []
for envelope in envelopes:
results.append(self.consume_peer_record(envelope, ttl))
return results
def get_peer_record(self, peer_id: ID) -> Envelope | None:
"""
Retrieve the most recent signed PeerRecord `Envelope` for a peer, if it exists
and is still relevant.
First, it runs cleanup via `maybe_delete_peer_record` to purge stale data.
Then it checks whether the peer has valid, unexpired addresses before
returning the associated envelope.
:param peer_id: The peer to look up.
:return: The signed Envelope if the peer is known and has valid
addresses; None otherwise.
"""
self.maybe_delete_peer_record(peer_id)
# Check if the peer has any valid addresses
if (
peer_id in self.peer_data_map
and not self.peer_data_map[peer_id].is_expired()
):
state = self.peer_record_map.get(peer_id)
if state is not None:
return state.envelope
return None
# -------ADDR-BOOK--------
def add_addr(self, peer_id: ID, addr: Multiaddr, ttl: int = 0) -> None:
"""
:param peer_id: peer ID to add address for
@ -403,15 +140,6 @@ class PeerStore(IPeerStore):
peer_data.set_ttl(ttl)
peer_data.update_last_identified()
if peer_id in self.addr_update_channels:
for addr in addrs:
try:
self.addr_update_channels[peer_id].send_nowait(addr)
except trio.WouldBlock:
pass # Or consider logging / dropping / replacing stream
self.maybe_delete_peer_record(peer_id)
def addrs(self, peer_id: ID) -> list[Multiaddr]:
"""
:param peer_id: peer ID to get addrs for
@ -435,11 +163,9 @@ class PeerStore(IPeerStore):
if peer_id in self.peer_data_map:
self.peer_data_map[peer_id].clear_addrs()
self.maybe_delete_peer_record(peer_id)
def peers_with_addrs(self) -> list[ID]:
"""
:return: all of the peer IDs which has addrsfloat stored in peer store
:return: all of the peer IDs which has addrs stored in peer store
"""
# Add all peers with addrs at least 1 to output
output: list[ID] = []
@ -453,27 +179,6 @@ class PeerStore(IPeerStore):
peer_data.clear_addrs()
return output
async def addr_stream(self, peer_id: ID) -> AsyncIterable[Multiaddr]:
"""
Returns an async stream of newly added addresses for the given peer.
This function allows consumers to subscribe to address updates for a peer
and receive each new address as it is added via `add_addr` or `add_addrs`.
:param peer_id: The ID of the peer to monitor address updates for.
:return: An async iterator yielding Multiaddr instances as they are added.
"""
send: MemorySendChannel[Multiaddr]
receive: MemoryReceiveChannel[Multiaddr]
send, receive = trio.open_memory_channel(0)
self.addr_update_channels[peer_id] = send
async for addr in receive:
yield addr
# -------KEY-BOOK---------
def add_pubkey(self, peer_id: ID, pubkey: PublicKey) -> None:
"""
:param peer_id: peer ID to add public key for
@ -534,45 +239,6 @@ class PeerStore(IPeerStore):
self.add_pubkey(peer_id, key_pair.public_key)
self.add_privkey(peer_id, key_pair.private_key)
def peer_with_keys(self) -> list[ID]:
"""Returns the peer_ids for which keys are stored"""
return [
peer_id
for peer_id, pdata in self.peer_data_map.items()
if pdata.pubkey is not None
]
def clear_keydata(self, peer_id: ID) -> None:
"""Clears the keys of the peer"""
peer_data = self.peer_data_map[peer_id]
peer_data.clear_keydata()
# --------METRICS--------
def record_latency(self, peer_id: ID, RTT: float) -> None:
"""
Records a new latency measurement for the given peer
using Exponentially Weighted Moving Average (EWMA)
:param peer_id: peer ID to get private key for
:param RTT: the new latency value (round trip time)
"""
peer_data = self.peer_data_map[peer_id]
peer_data.record_latency(RTT)
def latency_EWMA(self, peer_id: ID) -> float:
"""
:param peer_id: peer ID to get private key for
:return: The latency EWMA value for that peer
"""
peer_data = self.peer_data_map[peer_id]
return peer_data.latency_EWMA()
def clear_metrics(self, peer_id: ID) -> None:
"""Clear the latency metrics"""
peer_data = self.peer_data_map[peer_id]
peer_data.clear_metrics()
class PeerStoreError(KeyError):
"""Raised when peer ID is not found in peer store."""

81
libp2p/protocol_muxer/multiselect.py
View File

@ -1,5 +1,3 @@
import trio
from libp2p.abc import (
IMultiselectCommunicator,
IMultiselectMuxer,
@ -16,7 +14,6 @@ from .exceptions import (
MULTISELECT_PROTOCOL_ID = "/multistream/1.0.0"
PROTOCOL_NOT_FOUND_MSG = "na"
DEFAULT_NEGOTIATE_TIMEOUT = 5
class Multiselect(IMultiselectMuxer):
@ -48,69 +45,49 @@ class Multiselect(IMultiselectMuxer):
"""
self.handlers[protocol] = handler
# FIXME: Make TProtocol Optional[TProtocol] to keep types consistent
async def negotiate(
self,
communicator: IMultiselectCommunicator,
negotiate_timeout: int = DEFAULT_NEGOTIATE_TIMEOUT,
) -> tuple[TProtocol | None, StreamHandlerFn | None]:
self, communicator: IMultiselectCommunicator
) -> tuple[TProtocol, StreamHandlerFn | None]:
"""
Negotiate performs protocol selection.
:param stream: stream to negotiate on
:param negotiate_timeout: timeout for negotiation
:return: selected protocol name, handler function
:raise MultiselectError: raised when negotiation failed
"""
try:
with trio.fail_after(negotiate_timeout):
await self.handshake(communicator)
await self.handshake(communicator)
while True:
while True:
try:
command = await communicator.read()
except MultiselectCommunicatorError as error:
raise MultiselectError() from error
if command == "ls":
supported_protocols = [p for p in self.handlers.keys() if p is not None]
response = "\n".join(supported_protocols) + "\n"
try:
await communicator.write(response)
except MultiselectCommunicatorError as error:
raise MultiselectError() from error
else:
protocol = TProtocol(command)
if protocol in self.handlers:
try:
command = await communicator.read()
await communicator.write(protocol)
except MultiselectCommunicatorError as error:
raise MultiselectError() from error
if command == "ls":
supported_protocols = [
p for p in self.handlers.keys() if p is not None
]
response = "\n".join(supported_protocols) + "\n"
return protocol, self.handlers[protocol]
try:
await communicator.write(PROTOCOL_NOT_FOUND_MSG)
except MultiselectCommunicatorError as error:
raise MultiselectError() from error
try:
await communicator.write(response)
except MultiselectCommunicatorError as error:
raise MultiselectError() from error
else:
protocol_to_check = None if not command else TProtocol(command)
if protocol_to_check in self.handlers:
try:
await communicator.write(command)
except MultiselectCommunicatorError as error:
raise MultiselectError() from error
return protocol_to_check, self.handlers[protocol_to_check]
try:
await communicator.write(PROTOCOL_NOT_FOUND_MSG)
except MultiselectCommunicatorError as error:
raise MultiselectError() from error
raise MultiselectError("Negotiation failed: no matching protocol")
except trio.TooSlowError:
raise MultiselectError("handshake read timeout")
def get_protocols(self) -> tuple[TProtocol | None, ...]:
"""
Retrieve the protocols for which handlers have been registered.
Returns
-------
tuple[TProtocol, ...]
A tuple of registered protocol names.
"""
return tuple(self.handlers.keys())
raise MultiselectError("Negotiation failed: no matching protocol")
async def handshake(self, communicator: IMultiselectCommunicator) -> None:
"""

80
libp2p/protocol_muxer/multiselect_client.py
View File

@ -2,8 +2,6 @@ from collections.abc import (
Sequence,
)
import trio
from libp2p.abc import (
IMultiselectClient,
IMultiselectCommunicator,
@ -19,7 +17,6 @@ from .exceptions import (
MULTISELECT_PROTOCOL_ID = "/multistream/1.0.0"
PROTOCOL_NOT_FOUND_MSG = "na"
DEFAULT_NEGOTIATE_TIMEOUT = 5
class MultiselectClient(IMultiselectClient):
@ -43,7 +40,6 @@ class MultiselectClient(IMultiselectClient):
try:
handshake_contents = await communicator.read()
except MultiselectCommunicatorError as error:
raise MultiselectClientError() from error
@ -51,10 +47,7 @@ class MultiselectClient(IMultiselectClient):
raise MultiselectClientError("multiselect protocol ID mismatch")
async def select_one_of(
self,
protocols: Sequence[TProtocol],
communicator: IMultiselectCommunicator,
negotitate_timeout: int = DEFAULT_NEGOTIATE_TIMEOUT,
self, protocols: Sequence[TProtocol], communicator: IMultiselectCommunicator
) -> TProtocol:
"""
For each protocol, send message to multiselect selecting protocol and
@ -63,32 +56,22 @@ class MultiselectClient(IMultiselectClient):
:param protocol: protocol to select
:param communicator: communicator to use to communicate with counterparty
:param negotiate_timeout: timeout for negotiation
:return: selected protocol
:raise MultiselectClientError: raised when protocol negotiation failed
"""
try:
with trio.fail_after(negotitate_timeout):
await self.handshake(communicator)
await self.handshake(communicator)
for protocol in protocols:
try:
selected_protocol = await self.try_select(
communicator, protocol
)
return selected_protocol
except MultiselectClientError:
pass
for protocol in protocols:
try:
selected_protocol = await self.try_select(communicator, protocol)
return selected_protocol
except MultiselectClientError:
pass
raise MultiselectClientError("protocols not supported")
except trio.TooSlowError:
raise MultiselectClientError("response timed out")
raise MultiselectClientError("protocols not supported")
async def query_multistream_command(
self,
communicator: IMultiselectCommunicator,
command: str,
response_timeout: int = DEFAULT_NEGOTIATE_TIMEOUT,
self, communicator: IMultiselectCommunicator, command: str
) -> list[str]:
"""
Send a multistream-select command over the given communicator and return
@ -96,32 +79,26 @@ class MultiselectClient(IMultiselectClient):
:param communicator: communicator to use to communicate with counterparty
:param command: supported multistream-select command(e.g., ls)
:param negotiate_timeout: timeout for negotiation
:raise MultiselectClientError: If the communicator fails to process data.
:return: list of strings representing the response from peer.
"""
await self.handshake(communicator)
if command == "ls":
try:
await communicator.write("ls")
except MultiselectCommunicatorError as error:
raise MultiselectClientError() from error
else:
raise ValueError("Command not supported")
try:
with trio.fail_after(response_timeout):
await self.handshake(communicator)
response = await communicator.read()
response_list = response.strip().splitlines()
except MultiselectCommunicatorError as error:
raise MultiselectClientError() from error
if command == "ls":
try:
await communicator.write("ls")
except MultiselectCommunicatorError as error:
raise MultiselectClientError() from error
else:
raise ValueError("Command not supported")
try:
response = await communicator.read()
response_list = response.strip().splitlines()
except MultiselectCommunicatorError as error:
raise MultiselectClientError() from error
return response_list
except trio.TooSlowError:
raise MultiselectClientError("command response timed out")
return response_list
async def try_select(
self, communicator: IMultiselectCommunicator, protocol: TProtocol
@ -134,20 +111,17 @@ class MultiselectClient(IMultiselectClient):
:raise MultiselectClientError: raised when protocol negotiation failed
:return: selected protocol
"""
# Represent `None` protocol as an empty string.
protocol_str = protocol if protocol is not None else ""
try:
await communicator.write(protocol_str)
await communicator.write(protocol)
except MultiselectCommunicatorError as error:
raise MultiselectClientError() from error
try:
response = await communicator.read()
except MultiselectCommunicatorError as error:
raise MultiselectClientError() from error
if response == protocol_str:
if response == protocol:
return protocol
if response == PROTOCOL_NOT_FOUND_MSG:
raise MultiselectClientError("protocol not supported")

5
libp2p/protocol_muxer/multiselect_communicator.py
View File

@ -30,10 +30,7 @@ class MultiselectCommunicator(IMultiselectCommunicator):
"""
:raise MultiselectCommunicatorError: raised when failed to write to underlying reader
""" # noqa: E501
if msg_str is None:
msg_bytes = encode_delim(b"")
else:
msg_bytes = encode_delim(msg_str.encode())
msg_bytes = encode_delim(msg_str.encode())
try:
await self.read_writer.write(msg_bytes)
except IOException as error:

20
libp2p/pubsub/floodsub.py
View File

@ -12,10 +12,15 @@ from libp2p.abc import (
from libp2p.custom_types import (
TProtocol,
)
from libp2p.network.stream.exceptions import (
StreamClosed,
)
from libp2p.peer.id import (
ID,
)
from libp2p.peer.peerstore import env_to_send_in_RPC
from libp2p.utils import (
encode_varint_prefixed,
)
from .exceptions import (
PubsubRouterError,
@ -104,11 +109,6 @@ class FloodSub(IPubsubRouter):
)
rpc_msg = rpc_pb2.RPC(publish=[pubsub_msg])
# Add the senderRecord of the peer in the RPC msg
if isinstance(self.pubsub, Pubsub):
envelope_bytes, _ = env_to_send_in_RPC(self.pubsub.host)
rpc_msg.senderRecord = envelope_bytes
logger.debug("publishing message %s", pubsub_msg)
if self.pubsub is None:
@ -120,7 +120,13 @@ class FloodSub(IPubsubRouter):
if peer_id not in pubsub.peers:
continue
stream = pubsub.peers[peer_id]
await pubsub.write_msg(stream, rpc_msg)
# FIXME: We should add a `WriteMsg` similar to write delimited messages.
# Ref: https://github.com/libp2p/go-libp2p-pubsub/blob/master/comm.go#L107
try:
await stream.write(encode_varint_prefixed(rpc_msg.SerializeToString()))
except StreamClosed:
logger.debug("Fail to publish message to %s: stream closed", peer_id)
pubsub._handle_dead_peer(peer_id)
async def join(self, topic: str) -> None:
"""

393
libp2p/pubsub/gossipsub.py
View File

@ -24,25 +24,27 @@ from libp2p.abc import (
from libp2p.custom_types import (
TProtocol,
)
from libp2p.network.stream.exceptions import (
StreamClosed,
)
from libp2p.peer.id import (
ID,
)
from libp2p.peer.peerinfo import (
PeerInfo,
peer_info_from_bytes,
peer_info_to_bytes,
)
from libp2p.peer.peerstore import (
PERMANENT_ADDR_TTL,
env_to_send_in_RPC,
)
from libp2p.pubsub import (
floodsub,
)
from libp2p.pubsub.utils import maybe_consume_signed_record
from libp2p.tools.async_service import (
Service,
)
from libp2p.utils import (
encode_varint_prefixed,
)
from .exceptions import (
NoPubsubAttached,
@ -90,12 +92,6 @@ class GossipSub(IPubsubRouter, Service):
direct_connect_initial_delay: float
direct_connect_interval: int
do_px: bool
px_peers_count: int
back_off: dict[str, dict[ID, int]]
prune_back_off: int
unsubscribe_back_off: int
def __init__(
self,
protocols: Sequence[TProtocol],
@ -110,10 +106,6 @@ class GossipSub(IPubsubRouter, Service):
heartbeat_interval: int = 120,
direct_connect_initial_delay: float = 0.1,
direct_connect_interval: int = 300,
do_px: bool = False,
px_peers_count: int = 16,
prune_back_off: int = 60,
unsubscribe_back_off: int = 10,
) -> None:
self.protocols = list(protocols)
self.pubsub = None
@ -148,12 +140,6 @@ class GossipSub(IPubsubRouter, Service):
self.direct_connect_initial_delay = direct_connect_initial_delay
self.time_since_last_publish = {}
self.do_px = do_px
self.px_peers_count = px_peers_count
self.back_off = dict()
self.prune_back_off = prune_back_off
self.unsubscribe_back_off = unsubscribe_back_off
async def run(self) -> None:
self.manager.run_daemon_task(self.heartbeat)
if len(self.direct_peers) > 0:
@ -228,12 +214,6 @@ class GossipSub(IPubsubRouter, Service):
:param rpc: RPC message
:param sender_peer_id: id of the peer who sent the message
"""
# Process the senderRecord if sent
if isinstance(self.pubsub, Pubsub):
if not maybe_consume_signed_record(rpc, self.pubsub.host, sender_peer_id):
logger.error("Received an invalid-signed-record, ignoring the message")
return
control_message = rpc.control
# Relay each rpc control message to the appropriate handler
@ -261,11 +241,6 @@ class GossipSub(IPubsubRouter, Service):
)
rpc_msg = rpc_pb2.RPC(publish=[pubsub_msg])
# Add the senderRecord of the peer in the RPC msg
if isinstance(self.pubsub, Pubsub):
envelope_bytes, _ = env_to_send_in_RPC(self.pubsub.host)
rpc_msg.senderRecord = envelope_bytes
logger.debug("publishing message %s", pubsub_msg)
for peer_id in peers_gen:
@ -274,10 +249,14 @@ class GossipSub(IPubsubRouter, Service):
if peer_id not in self.pubsub.peers:
continue
stream = self.pubsub.peers[peer_id]
# FIXME: We should add a `WriteMsg` similar to write delimited messages.
# Ref: https://github.com/libp2p/go-libp2p-pubsub/blob/master/comm.go#L107
# TODO: Go use `sendRPC`, which possibly piggybacks gossip/control messages.
await self.pubsub.write_msg(stream, rpc_msg)
try:
await stream.write(encode_varint_prefixed(rpc_msg.SerializeToString()))
except StreamClosed:
logger.debug("Fail to publish message to %s: stream closed", peer_id)
self.pubsub._handle_dead_peer(peer_id)
for topic in pubsub_msg.topicIDs:
self.time_since_last_publish[topic] = int(time.time())
@ -355,22 +334,15 @@ class GossipSub(IPubsubRouter, Service):
self.mesh[topic] = set()
topic_in_fanout: bool = topic in self.fanout
fanout_peers: set[ID] = set()
if topic_in_fanout:
for peer in self.fanout[topic]:
if self._check_back_off(peer, topic):
continue
fanout_peers.add(peer)
fanout_peers: set[ID] = self.fanout[topic] if topic_in_fanout else set()
fanout_size = len(fanout_peers)
if not topic_in_fanout or (topic_in_fanout and fanout_size < self.degree):
# There are less than D peers (let this number be x)
# in the fanout for a topic (or the topic is not in the fanout).
# Selects the remaining number of peers (D-x) from peers.gossipsub[topic].
if self.pubsub is not None and topic in self.pubsub.peer_topics:
if topic in self.pubsub.peer_topics:
selected_peers = self._get_in_topic_gossipsub_peers_from_minus(
topic, self.degree - fanout_size, fanout_peers, True
topic, self.degree - fanout_size, fanout_peers
)
# Combine fanout peers with selected peers
fanout_peers.update(selected_peers)
@ -397,8 +369,7 @@ class GossipSub(IPubsubRouter, Service):
return
# Notify the peers in mesh[topic] with a PRUNE(topic) message
for peer in self.mesh[topic]:
await self.emit_prune(topic, peer, self.do_px, True)
self._add_back_off(peer, topic, True)
await self.emit_prune(topic, peer)
# Forget mesh[topic]
self.mesh.pop(topic, None)
@ -488,8 +459,8 @@ class GossipSub(IPubsubRouter, Service):
self.fanout_heartbeat()
# Get the peers to send IHAVE to
peers_to_gossip = self.gossip_heartbeat()
# Pack(piggyback) GRAFT, PRUNE and IHAVE for the same peer into
# one control message and send it
# Pack GRAFT, PRUNE and IHAVE for the same peer into one control message and
# send it
await self._emit_control_msgs(
peers_to_graft, peers_to_prune, peers_to_gossip
)
@ -534,7 +505,7 @@ class GossipSub(IPubsubRouter, Service):
if num_mesh_peers_in_topic < self.degree_low:
# Select D - |mesh[topic]| peers from peers.gossipsub[topic] - mesh[topic] # noqa: E501
selected_peers = self._get_in_topic_gossipsub_peers_from_minus(
topic, self.degree - num_mesh_peers_in_topic, self.mesh[topic], True
topic, self.degree - num_mesh_peers_in_topic, self.mesh[topic]
)
for peer in selected_peers:
@ -557,97 +528,82 @@ class GossipSub(IPubsubRouter, Service):
peers_to_prune[peer].append(topic)
return peers_to_graft, peers_to_prune
def _handle_topic_heartbeat(
self,
topic: str,
current_peers: set[ID],
is_fanout: bool = False,
peers_to_gossip: DefaultDict[ID, dict[str, list[str]]] | None = None,
) -> tuple[set[ID], bool]:
"""
Helper method to handle heartbeat for a single topic,
supporting both fanout and gossip.
:param topic: The topic to handle
:param current_peers: Current set of peers in the topic
:param is_fanout: Whether this is a fanout topic (affects expiration check)
:param peers_to_gossip: Optional dictionary to store peers to gossip to
:return: Tuple of (updated_peers, should_remove_topic)
"""
if self.pubsub is None:
raise NoPubsubAttached
# Skip if no peers have subscribed to the topic
if topic not in self.pubsub.peer_topics:
return current_peers, False
# For fanout topics, check if we should remove the topic
if is_fanout:
if self.time_since_last_publish.get(topic, 0) + self.time_to_live < int(
time.time()
):
return set(), True
# Check if peers are still in the topic and remove the ones that are not
in_topic_peers: set[ID] = {
peer for peer in current_peers if peer in self.pubsub.peer_topics[topic]
}
# If we need more peers to reach target degree
if len(in_topic_peers) < self.degree:
# Select additional peers from peers.gossipsub[topic]
selected_peers = self._get_in_topic_gossipsub_peers_from_minus(
topic, self.degree - len(in_topic_peers), in_topic_peers, True
)
# Add the selected peers
in_topic_peers.update(selected_peers)
# Handle gossip if requested
if peers_to_gossip is not None:
msg_ids = self.mcache.window(topic)
if msg_ids:
# Select D peers from peers.gossipsub[topic] excluding current peers
peers_to_emit_ihave_to = self._get_in_topic_gossipsub_peers_from_minus(
topic, self.degree, current_peers, True
)
msg_id_strs = [str(msg_id) for msg_id in msg_ids]
for peer in peers_to_emit_ihave_to:
peers_to_gossip[peer][topic] = msg_id_strs
return in_topic_peers, False
def fanout_heartbeat(self) -> None:
"""
Maintain fanout topics by:
1. Removing expired topics
2. Removing peers that are no longer in the topic
3. Adding new peers if needed to maintain the target degree
"""
# Note: the comments here are the exact pseudocode from the spec
for topic in list(self.fanout):
updated_peers, should_remove = self._handle_topic_heartbeat(
topic, self.fanout[topic], is_fanout=True
)
if should_remove:
if (
self.pubsub is not None
and topic not in self.pubsub.peer_topics
and self.time_since_last_publish.get(topic, 0) + self.time_to_live
< int(time.time())
):
# Remove topic from fanout
del self.fanout[topic]
else:
self.fanout[topic] = updated_peers
# Check if fanout peers are still in the topic and remove the ones that are not # noqa: E501
# ref: https://github.com/libp2p/go-libp2p-pubsub/blob/01b9825fbee1848751d90a8469e3f5f43bac8466/gossipsub.go#L498-L504 # noqa: E501
in_topic_fanout_peers: list[ID] = []
if self.pubsub is not None:
in_topic_fanout_peers = [
peer
for peer in self.fanout[topic]
if peer in self.pubsub.peer_topics[topic]
]
self.fanout[topic] = set(in_topic_fanout_peers)
num_fanout_peers_in_topic = len(self.fanout[topic])
# If |fanout[topic]| < D
if num_fanout_peers_in_topic < self.degree:
# Select D - |fanout[topic]| peers from peers.gossipsub[topic] - fanout[topic] # noqa: E501
selected_peers = self._get_in_topic_gossipsub_peers_from_minus(
topic,
self.degree - num_fanout_peers_in_topic,
self.fanout[topic],
)
# Add the peers to fanout[topic]
self.fanout[topic].update(selected_peers)
def gossip_heartbeat(self) -> DefaultDict[ID, dict[str, list[str]]]:
peers_to_gossip: DefaultDict[ID, dict[str, list[str]]] = defaultdict(dict)
# Handle mesh topics
for topic in self.mesh:
self._handle_topic_heartbeat(
topic, self.mesh[topic], peers_to_gossip=peers_to_gossip
)
msg_ids = self.mcache.window(topic)
if msg_ids:
if self.pubsub is None:
raise NoPubsubAttached
# Get all pubsub peers in a topic and only add them if they are
# gossipsub peers too
if topic in self.pubsub.peer_topics:
# Select D peers from peers.gossipsub[topic]
peers_to_emit_ihave_to = (
self._get_in_topic_gossipsub_peers_from_minus(
topic, self.degree, self.mesh[topic]
)
)
# Handle fanout topics that aren't in mesh
msg_id_strs = [str(msg_id) for msg_id in msg_ids]
for peer in peers_to_emit_ihave_to:
peers_to_gossip[peer][topic] = msg_id_strs
# TODO: Refactor and Dedup. This section is the roughly the same as the above.
# Do the same for fanout, for all topics not already hit in mesh
for topic in self.fanout:
if topic not in self.mesh:
self._handle_topic_heartbeat(
topic, self.fanout[topic], peers_to_gossip=peers_to_gossip
)
msg_ids = self.mcache.window(topic)
if msg_ids:
if self.pubsub is None:
raise NoPubsubAttached
# Get all pubsub peers in topic and only add if they are
# gossipsub peers also
if topic in self.pubsub.peer_topics:
# Select D peers from peers.gossipsub[topic]
peers_to_emit_ihave_to = (
self._get_in_topic_gossipsub_peers_from_minus(
topic, self.degree, self.fanout[topic]
)
)
msg_id_strs = [str(msg) for msg in msg_ids]
for peer in peers_to_emit_ihave_to:
peers_to_gossip[peer][topic] = msg_id_strs
return peers_to_gossip
@staticmethod
@ -682,11 +638,7 @@ class GossipSub(IPubsubRouter, Service):
return selection
def _get_in_topic_gossipsub_peers_from_minus(
self,
topic: str,
num_to_select: int,
minus: Iterable[ID],
backoff_check: bool = False,
self, topic: str, num_to_select: int, minus: Iterable[ID]
) -> list[ID]:
if self.pubsub is None:
raise NoPubsubAttached
@ -695,88 +647,8 @@ class GossipSub(IPubsubRouter, Service):
for peer_id in self.pubsub.peer_topics[topic]
if self.peer_protocol[peer_id] == PROTOCOL_ID
}
if backoff_check:
# filter out peers that are in back off for this topic
gossipsub_peers_in_topic = {
peer_id
for peer_id in gossipsub_peers_in_topic
if self._check_back_off(peer_id, topic) is False
}
return self.select_from_minus(num_to_select, gossipsub_peers_in_topic, minus)
def _add_back_off(
self, peer: ID, topic: str, is_unsubscribe: bool, backoff_duration: int = 0
) -> None:
"""
Add back off for a peer in a topic.
:param peer: peer to add back off for
:param topic: topic to add back off for
:param is_unsubscribe: whether this is an unsubscribe operation
:param backoff_duration: duration of back off in seconds, if 0, use default
"""
if topic not in self.back_off:
self.back_off[topic] = dict()
backoff_till = int(time.time())
if backoff_duration > 0:
backoff_till += backoff_duration
else:
if is_unsubscribe:
backoff_till += self.unsubscribe_back_off
else:
backoff_till += self.prune_back_off
if peer not in self.back_off[topic]:
self.back_off[topic][peer] = backoff_till
else:
self.back_off[topic][peer] = max(self.back_off[topic][peer], backoff_till)
def _check_back_off(self, peer: ID, topic: str) -> bool:
"""
Check if a peer is in back off for a topic and cleanup expired back off entries.
:param peer: peer to check
:param topic: topic to check
:return: True if the peer is in back off, False otherwise
"""
if topic not in self.back_off or peer not in self.back_off[topic]:
return False
if self.back_off[topic].get(peer, 0) > int(time.time()):
return True
else:
del self.back_off[topic][peer]
return False
async def _do_px(self, px_peers: list[rpc_pb2.PeerInfo]) -> None:
if len(px_peers) > self.px_peers_count:
px_peers = px_peers[: self.px_peers_count]
for peer in px_peers:
peer_id: ID = ID(peer.peerID)
if self.pubsub and peer_id in self.pubsub.peers:
continue
try:
peer_info = peer_info_from_bytes(peer.signedPeerRecord)
try:
if self.pubsub is None:
raise NoPubsubAttached
await self.pubsub.host.connect(peer_info)
except Exception as e:
logger.warning(
"failed to connect to px peer %s: %s",
peer_id,
e,
)
continue
except Exception as e:
logger.warning(
"failed to parse peer info from px peer %s: %s",
peer_id,
e,
)
continue
# RPC handlers
async def handle_ihave(
@ -788,16 +660,16 @@ class GossipSub(IPubsubRouter, Service):
# Get list of all seen (seqnos, from) from the (seqno, from) tuples in
# seen_messages cache
seen_seqnos_and_peers = [
str(seqno_and_from)
for seqno_and_from in self.pubsub.seen_messages.cache.keys()
seqno_and_from for seqno_and_from in self.pubsub.seen_messages.cache.keys()
]
# Add all unknown message ids (ids that appear in ihave_msg but not in
# seen_seqnos) to list of messages we want to request
msg_ids_wanted: list[str] = [
# FIXME: Update type of message ID
msg_ids_wanted: list[Any] = [
msg_id
for msg_id in ihave_msg.messageIDs
if msg_id not in seen_seqnos_and_peers
if literal_eval(msg_id) not in seen_seqnos_and_peers
]
# Request messages with IWANT message
@ -831,15 +703,10 @@ class GossipSub(IPubsubRouter, Service):
# 1) Package these messages into a single packet
packet: rpc_pb2.RPC = rpc_pb2.RPC()
# Here the an RPC message is being created and published in response
# to the iwant control msg, so we will send a freshly created senderRecord
# with the RPC msg
if isinstance(self.pubsub, Pubsub):
envelope_bytes, _ = env_to_send_in_RPC(self.pubsub.host)
packet.senderRecord = envelope_bytes
packet.publish.extend(msgs_to_forward)
# 2) Serialize that packet
rpc_msg: bytes = packet.SerializeToString()
if self.pubsub is None:
raise NoPubsubAttached
@ -853,7 +720,14 @@ class GossipSub(IPubsubRouter, Service):
peer_stream = self.pubsub.peers[sender_peer_id]
# 4) And write the packet to the stream
await self.pubsub.write_msg(peer_stream, packet)
try:
await peer_stream.write(encode_varint_prefixed(rpc_msg))
except StreamClosed:
logger.debug(
"Fail to responed to iwant request from %s: stream closed",
sender_peer_id,
)
self.pubsub._handle_dead_peer(sender_peer_id)
async def handle_graft(
self, graft_msg: rpc_pb2.ControlGraft, sender_peer_id: ID
@ -867,46 +741,24 @@ class GossipSub(IPubsubRouter, Service):
logger.warning(
"GRAFT: ignoring request from direct peer %s", sender_peer_id
)
await self.emit_prune(topic, sender_peer_id, False, False)
await self.emit_prune(topic, sender_peer_id)
return
if self._check_back_off(sender_peer_id, topic):
logger.warning(
"GRAFT: ignoring request from %s, back off until %d",
sender_peer_id,
self.back_off[topic][sender_peer_id],
)
self._add_back_off(sender_peer_id, topic, False)
await self.emit_prune(topic, sender_peer_id, False, False)
return
if sender_peer_id not in self.mesh[topic]:
self.mesh[topic].add(sender_peer_id)
else:
# Respond with PRUNE if not subscribed to the topic
await self.emit_prune(topic, sender_peer_id, self.do_px, False)
await self.emit_prune(topic, sender_peer_id)
async def handle_prune(
self, prune_msg: rpc_pb2.ControlPrune, sender_peer_id: ID
) -> None:
topic: str = prune_msg.topicID
backoff_till: int = prune_msg.backoff
px_peers: list[rpc_pb2.PeerInfo] = []
for peer in prune_msg.peers:
px_peers.append(peer)
# Remove peer from mesh for topic
if topic in self.mesh:
if backoff_till > 0:
self._add_back_off(sender_peer_id, topic, False, backoff_till)
else:
self._add_back_off(sender_peer_id, topic, False)
self.mesh[topic].discard(sender_peer_id)
if px_peers:
await self._do_px(px_peers)
# RPC emitters
def pack_control_msgs(
@ -955,36 +807,15 @@ class GossipSub(IPubsubRouter, Service):
await self.emit_control_message(control_msg, id)
async def emit_prune(
self, topic: str, to_peer: ID, do_px: bool, is_unsubscribe: bool
) -> None:
async def emit_prune(self, topic: str, id: ID) -> None:
"""Emit graft message, sent to to_peer, for topic."""
prune_msg: rpc_pb2.ControlPrune = rpc_pb2.ControlPrune()
prune_msg.topicID = topic
back_off_duration = self.prune_back_off
if is_unsubscribe:
back_off_duration = self.unsubscribe_back_off
prune_msg.backoff = back_off_duration
if do_px:
exchange_peers = self._get_in_topic_gossipsub_peers_from_minus(
topic, self.px_peers_count, [to_peer]
)
for peer in exchange_peers:
if self.pubsub is None:
raise NoPubsubAttached
peer_info = self.pubsub.host.get_peerstore().peer_info(peer)
signed_peer_record: rpc_pb2.PeerInfo = rpc_pb2.PeerInfo()
signed_peer_record.peerID = peer.to_bytes()
signed_peer_record.signedPeerRecord = peer_info_to_bytes(peer_info)
prune_msg.peers.append(signed_peer_record)
control_msg: rpc_pb2.ControlMessage = rpc_pb2.ControlMessage()
control_msg.prune.extend([prune_msg])
await self.emit_control_message(control_msg, to_peer)
await self.emit_control_message(control_msg, id)
async def emit_control_message(
self, control_msg: rpc_pb2.ControlMessage, to_peer: ID
@ -993,14 +824,10 @@ class GossipSub(IPubsubRouter, Service):
raise NoPubsubAttached
# Add control message to packet
packet: rpc_pb2.RPC = rpc_pb2.RPC()
# Add the sender's peer-record in the RPC msg
if isinstance(self.pubsub, Pubsub):
envelope_bytes, _ = env_to_send_in_RPC(self.pubsub.host)
packet.senderRecord = envelope_bytes
packet.control.CopyFrom(control_msg)
rpc_msg: bytes = packet.SerializeToString()
# Get stream for peer from pubsub
if to_peer not in self.pubsub.peers:
logger.debug(
@ -1010,4 +837,8 @@ class GossipSub(IPubsubRouter, Service):
peer_stream = self.pubsub.peers[to_peer]
# Write rpc to stream
await self.pubsub.write_msg(peer_stream, packet)
try:
await peer_stream.write(encode_varint_prefixed(rpc_msg))
except StreamClosed:
logger.debug("Fail to emit control message to %s: stream closed", to_peer)
self.pubsub._handle_dead_peer(to_peer)

8
libp2p/pubsub/pb/rpc.proto
View File

@ -14,7 +14,6 @@ message RPC {
}
optional ControlMessage control = 3;
optional bytes senderRecord = 4;
}
message Message {
@ -48,13 +47,6 @@ message ControlGraft {
message ControlPrune {
optional string topicID = 1;
repeated PeerInfo peers = 2;
optional uint64 backoff = 3;
}
message PeerInfo {
optional bytes peerID = 1;
optional bytes signedPeerRecord = 2;
}
message TopicDescriptor {

65
libp2p/pubsub/pb/rpc_pb2.py
View File

@ -1,12 +1,11 @@
# -*- coding: utf-8 -*-
# Generated by the protocol buffer compiler. DO NOT EDIT!
# source: libp2p/pubsub/pb/rpc.proto
# Protobuf Python Version: 4.25.3
"""Generated protocol buffer code."""
from google.protobuf.internal import builder as _builder
from google.protobuf import descriptor as _descriptor
from google.protobuf import descriptor_pool as _descriptor_pool
from google.protobuf import symbol_database as _symbol_database
from google.protobuf.internal import builder as _builder
# @@protoc_insertion_point(imports)
_sym_db = _symbol_database.Default()
@ -14,39 +13,37 @@ _sym_db = _symbol_database.Default()
DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x1alibp2p/pubsub/pb/rpc.proto\x12\tpubsub.pb\"\xca\x01\n\x03RPC\x12-\n\rsubscriptions\x18\x01 \x03(\x0b\x32\x16.pubsub.pb.RPC.SubOpts\x12#\n\x07publish\x18\x02 \x03(\x0b\x32\x12.pubsub.pb.Message\x12*\n\x07\x63ontrol\x18\x03 \x01(\x0b\x32\x19.pubsub.pb.ControlMessage\x12\x14\n\x0csenderRecord\x18\x04 \x01(\x0c\x1a-\n\x07SubOpts\x12\x11\n\tsubscribe\x18\x01 \x01(\x08\x12\x0f\n\x07topicid\x18\x02 \x01(\t\"i\n\x07Message\x12\x0f\n\x07\x66rom_id\x18\x01 \x01(\x0c\x12\x0c\n\x04\x64\x61ta\x18\x02 \x01(\x0c\x12\r\n\x05seqno\x18\x03 \x01(\x0c\x12\x10\n\x08topicIDs\x18\x04 \x03(\t\x12\x11\n\tsignature\x18\x05 \x01(\x0c\x12\x0b\n\x03key\x18\x06 \x01(\x0c\"\xb0\x01\n\x0e\x43ontrolMessage\x12&\n\x05ihave\x18\x01 \x03(\x0b\x32\x17.pubsub.pb.ControlIHave\x12&\n\x05iwant\x18\x02 \x03(\x0b\x32\x17.pubsub.pb.ControlIWant\x12&\n\x05graft\x18\x03 \x03(\x0b\x32\x17.pubsub.pb.ControlGraft\x12&\n\x05prune\x18\x04 \x03(\x0b\x32\x17.pubsub.pb.ControlPrune\"3\n\x0c\x43ontrolIHave\x12\x0f\n\x07topicID\x18\x01 \x01(\t\x12\x12\n\nmessageIDs\x18\x02 \x03(\t\"\"\n\x0c\x43ontrolIWant\x12\x12\n\nmessageIDs\x18\x01 \x03(\t\"\x1f\n\x0c\x43ontrolGraft\x12\x0f\n\x07topicID\x18\x01 \x01(\t\"T\n\x0c\x43ontrolPrune\x12\x0f\n\x07topicID\x18\x01 \x01(\t\x12\"\n\x05peers\x18\x02 \x03(\x0b\x32\x13.pubsub.pb.PeerInfo\x12\x0f\n\x07\x62\x61\x63koff\x18\x03 \x01(\x04\"4\n\x08PeerInfo\x12\x0e\n\x06peerID\x18\x01 \x01(\x0c\x12\x18\n\x10signedPeerRecord\x18\x02 \x01(\x0c\"\x87\x03\n\x0fTopicDescriptor\x12\x0c\n\x04name\x18\x01 \x01(\t\x12\x31\n\x04\x61uth\x18\x02 \x01(\x0b\x32#.pubsub.pb.TopicDescriptor.AuthOpts\x12/\n\x03\x65nc\x18\x03 \x01(\x0b\x32\".pubsub.pb.TopicDescriptor.EncOpts\x1a|\n\x08\x41uthOpts\x12:\n\x04mode\x18\x01 \x01(\x0e\x32,.pubsub.pb.TopicDescriptor.AuthOpts.AuthMode\x12\x0c\n\x04keys\x18\x02 \x03(\x0c\"&\n\x08\x41uthMode\x12\x08\n\x04NONE\x10\x00\x12\x07\n\x03KEY\x10\x01\x12\x07\n\x03WOT\x10\x02\x1a\x83\x01\n\x07\x45ncOpts\x12\x38\n\x04mode\x18\x01 \x01(\x0e\x32*.pubsub.pb.TopicDescriptor.EncOpts.EncMode\x12\x11\n\tkeyHashes\x18\x02 \x03(\x0c\"+\n\x07\x45ncMode\x12\x08\n\x04NONE\x10\x00\x12\r\n\tSHAREDKEY\x10\x01\x12\x07\n\x03WOT\x10\x02')
DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x1alibp2p/pubsub/pb/rpc.proto\x12\tpubsub.pb\"\xb4\x01\n\x03RPC\x12-\n\rsubscriptions\x18\x01 \x03(\x0b\x32\x16.pubsub.pb.RPC.SubOpts\x12#\n\x07publish\x18\x02 \x03(\x0b\x32\x12.pubsub.pb.Message\x12*\n\x07\x63ontrol\x18\x03 \x01(\x0b\x32\x19.pubsub.pb.ControlMessage\x1a-\n\x07SubOpts\x12\x11\n\tsubscribe\x18\x01 \x01(\x08\x12\x0f\n\x07topicid\x18\x02 \x01(\t\"i\n\x07Message\x12\x0f\n\x07\x66rom_id\x18\x01 \x01(\x0c\x12\x0c\n\x04\x64\x61ta\x18\x02 \x01(\x0c\x12\r\n\x05seqno\x18\x03 \x01(\x0c\x12\x10\n\x08topicIDs\x18\x04 \x03(\t\x12\x11\n\tsignature\x18\x05 \x01(\x0c\x12\x0b\n\x03key\x18\x06 \x01(\x0c\"\xb0\x01\n\x0e\x43ontrolMessage\x12&\n\x05ihave\x18\x01 \x03(\x0b\x32\x17.pubsub.pb.ControlIHave\x12&\n\x05iwant\x18\x02 \x03(\x0b\x32\x17.pubsub.pb.ControlIWant\x12&\n\x05graft\x18\x03 \x03(\x0b\x32\x17.pubsub.pb.ControlGraft\x12&\n\x05prune\x18\x04 \x03(\x0b\x32\x17.pubsub.pb.ControlPrune\"3\n\x0c\x43ontrolIHave\x12\x0f\n\x07topicID\x18\x01 \x01(\t\x12\x12\n\nmessageIDs\x18\x02 \x03(\t\"\"\n\x0c\x43ontrolIWant\x12\x12\n\nmessageIDs\x18\x01 \x03(\t\"\x1f\n\x0c\x43ontrolGraft\x12\x0f\n\x07topicID\x18\x01 \x01(\t\"\x1f\n\x0c\x43ontrolPrune\x12\x0f\n\x07topicID\x18\x01 \x01(\t\"\x87\x03\n\x0fTopicDescriptor\x12\x0c\n\x04name\x18\x01 \x01(\t\x12\x31\n\x04\x61uth\x18\x02 \x01(\x0b\x32#.pubsub.pb.TopicDescriptor.AuthOpts\x12/\n\x03\x65nc\x18\x03 \x01(\x0b\x32\".pubsub.pb.TopicDescriptor.EncOpts\x1a|\n\x08\x41uthOpts\x12:\n\x04mode\x18\x01 \x01(\x0e\x32,.pubsub.pb.TopicDescriptor.AuthOpts.AuthMode\x12\x0c\n\x04keys\x18\x02 \x03(\x0c\"&\n\x08\x41uthMode\x12\x08\n\x04NONE\x10\x00\x12\x07\n\x03KEY\x10\x01\x12\x07\n\x03WOT\x10\x02\x1a\x83\x01\n\x07\x45ncOpts\x12\x38\n\x04mode\x18\x01 \x01(\x0e\x32*.pubsub.pb.TopicDescriptor.EncOpts.EncMode\x12\x11\n\tkeyHashes\x18\x02 \x03(\x0c\"+\n\x07\x45ncMode\x12\x08\n\x04NONE\x10\x00\x12\r\n\tSHAREDKEY\x10\x01\x12\x07\n\x03WOT\x10\x02')
_globals = globals()
_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, _globals)
_builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'libp2p.pubsub.pb.rpc_pb2', _globals)
_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, globals())
_builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'libp2p.pubsub.pb.rpc_pb2', globals())
if _descriptor._USE_C_DESCRIPTORS == False:
DESCRIPTOR._options = None
_globals['_RPC']._serialized_start=42
_globals['_RPC']._serialized_end=244
_globals['_RPC_SUBOPTS']._serialized_start=199
_globals['_RPC_SUBOPTS']._serialized_end=244
_globals['_MESSAGE']._serialized_start=246
_globals['_MESSAGE']._serialized_end=351
_globals['_CONTROLMESSAGE']._serialized_start=354
_globals['_CONTROLMESSAGE']._serialized_end=530
_globals['_CONTROLIHAVE']._serialized_start=532
_globals['_CONTROLIHAVE']._serialized_end=583
_globals['_CONTROLIWANT']._serialized_start=585
_globals['_CONTROLIWANT']._serialized_end=619
_globals['_CONTROLGRAFT']._serialized_start=621
_globals['_CONTROLGRAFT']._serialized_end=652
_globals['_CONTROLPRUNE']._serialized_start=654
_globals['_CONTROLPRUNE']._serialized_end=738
_globals['_PEERINFO']._serialized_start=740
_globals['_PEERINFO']._serialized_end=792
_globals['_TOPICDESCRIPTOR']._serialized_start=795
_globals['_TOPICDESCRIPTOR']._serialized_end=1186
_globals['_TOPICDESCRIPTOR_AUTHOPTS']._serialized_start=928
_globals['_TOPICDESCRIPTOR_AUTHOPTS']._serialized_end=1052
_globals['_TOPICDESCRIPTOR_AUTHOPTS_AUTHMODE']._serialized_start=1014
_globals['_TOPICDESCRIPTOR_AUTHOPTS_AUTHMODE']._serialized_end=1052
_globals['_TOPICDESCRIPTOR_ENCOPTS']._serialized_start=1055
_globals['_TOPICDESCRIPTOR_ENCOPTS']._serialized_end=1186
_globals['_TOPICDESCRIPTOR_ENCOPTS_ENCMODE']._serialized_start=1143
_globals['_TOPICDESCRIPTOR_ENCOPTS_ENCMODE']._serialized_end=1186
_RPC._serialized_start=42
_RPC._serialized_end=222
_RPC_SUBOPTS._serialized_start=177
_RPC_SUBOPTS._serialized_end=222
_MESSAGE._serialized_start=224
_MESSAGE._serialized_end=329
_CONTROLMESSAGE._serialized_start=332
_CONTROLMESSAGE._serialized_end=508
_CONTROLIHAVE._serialized_start=510
_CONTROLIHAVE._serialized_end=561
_CONTROLIWANT._serialized_start=563
_CONTROLIWANT._serialized_end=597
_CONTROLGRAFT._serialized_start=599
_CONTROLGRAFT._serialized_end=630
_CONTROLPRUNE._serialized_start=632
_CONTROLPRUNE._serialized_end=663
_TOPICDESCRIPTOR._serialized_start=666
_TOPICDESCRIPTOR._serialized_end=1057
_TOPICDESCRIPTOR_AUTHOPTS._serialized_start=799
_TOPICDESCRIPTOR_AUTHOPTS._serialized_end=923
_TOPICDESCRIPTOR_AUTHOPTS_AUTHMODE._serialized_start=885
_TOPICDESCRIPTOR_AUTHOPTS_AUTHMODE._serialized_end=923
_TOPICDESCRIPTOR_ENCOPTS._serialized_start=926
_TOPICDESCRIPTOR_ENCOPTS._serialized_end=1057
_TOPICDESCRIPTOR_ENCOPTS_ENCMODE._serialized_start=1014
_TOPICDESCRIPTOR_ENCOPTS_ENCMODE._serialized_end=1057
# @@protoc_insertion_point(module_scope)

Some files were not shown because too many files have changed in this diff Show More