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https://github.com/varun-r-mallya/py-libp2p.git
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92 lines
2.7 KiB
Python
92 lines
2.7 KiB
Python
import logging
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from typing import (
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Optional,
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)
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from multiaddr import (
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Multiaddr,
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)
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from libp2p.abc import (
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IHost,
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INetStream,
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)
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from libp2p.custom_types import (
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StreamHandlerFn,
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TProtocol,
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)
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from libp2p.network.stream.exceptions import (
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StreamClosed,
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)
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from libp2p.utils import (
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get_agent_version,
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)
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from .pb.identify_pb2 import (
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Identify,
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)
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# Not sure I can do this or I break a pattern
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# logger = logging.getLogger("libp2p.identity.identify")
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logger = logging.getLogger(__name__)
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ID = TProtocol("/ipfs/id/1.0.0")
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PROTOCOL_VERSION = "ipfs/0.1.0"
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AGENT_VERSION = get_agent_version()
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def _multiaddr_to_bytes(maddr: Multiaddr) -> bytes:
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return maddr.to_bytes()
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def _mk_identify_protobuf(
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host: IHost, observed_multiaddr: Optional[Multiaddr]
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) -> Identify:
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public_key = host.get_public_key()
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laddrs = host.get_addrs()
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protocols = host.get_mux().get_protocols()
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observed_addr = observed_multiaddr.to_bytes() if observed_multiaddr else b""
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return Identify(
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protocol_version=PROTOCOL_VERSION,
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agent_version=AGENT_VERSION,
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public_key=public_key.serialize(),
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listen_addrs=map(_multiaddr_to_bytes, laddrs),
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observed_addr=observed_addr,
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protocols=protocols,
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)
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def identify_handler_for(host: IHost) -> StreamHandlerFn:
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async def handle_identify(stream: INetStream) -> None:
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# get observed address from ``stream``
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# class Swarm(Service, INetworkService):
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# TODO: Connection and `peer_id` are 1-1 mapping in our implementation,
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# whereas in Go one `peer_id` may point to multiple connections.
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# connections: dict[ID, INetConn]
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# Luca: So I'm assuming that the connection is 1-1 mapping for now
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peer_id = stream.muxed_conn.peer_id # remote peer_id
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peer_store = host.get_peerstore() # get the peer store from the host
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remote_peer_multiaddrs = peer_store.addrs(
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peer_id
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) # get the Multiaddrs for the remote peer_id
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logger.debug("multiaddrs of remote peer is %s", remote_peer_multiaddrs)
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logger.debug("received a request for %s from %s", ID, peer_id)
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# Select the first address if available, else None
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observed_multiaddr = (
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remote_peer_multiaddrs[0] if remote_peer_multiaddrs else None
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)
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protobuf = _mk_identify_protobuf(host, observed_multiaddr)
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response = protobuf.SerializeToString()
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try:
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await stream.write(response)
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except StreamClosed:
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logger.debug("Fail to respond to %s request: stream closed", ID)
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else:
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await stream.close()
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logger.debug("successfully handled request for %s from %s", ID, peer_id)
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return handle_identify
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