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feat: add length-prefixed protobuf support to identify protocol

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This commit is contained in:
acul71
2025-07-13 15:55:37 +02:00
parent 96434d9977
commit 8ec67289da
9 changed files with 797 additions and 22 deletions
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32
libp2p/identity/identify_push/identify_push.py
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@ -25,6 +25,10 @@ from libp2p.peer.id import (
)
from libp2p.utils import (
get_agent_version,
varint,
)
from libp2p.utils.varint import (
decode_varint_from_bytes,
)
from ..identify.identify import (
@ -55,8 +59,29 @@ def identify_push_handler_for(host: IHost) -> StreamHandlerFn:
peer_id = stream.muxed_conn.peer_id
try:
# Read the identify message from the stream
data = await stream.read()
# Read length-prefixed identify message from the stream
# First read the varint length prefix
length_bytes = b""
while True:
b = await stream.read(1)
if not b:
break
length_bytes += b
if b[0] & 0x80 == 0:
break
if not length_bytes:
logger.warning("No length prefix received from peer %s", peer_id)
return
msg_length = decode_varint_from_bytes(length_bytes)
# Read the protobuf message
data = await stream.read(msg_length)
if len(data) != msg_length:
logger.warning("Incomplete message received from peer %s", peer_id)
return
identify_msg = Identify()
identify_msg.ParseFromString(data)
@ -159,7 +184,8 @@ async def push_identify_to_peer(
identify_msg = _mk_identify_protobuf(host, observed_multiaddr)
response = identify_msg.SerializeToString()
# Send the identify message
# Send length-prefixed identify message
await stream.write(varint.encode_uvarint(len(response)))
await stream.write(response)
# Close the stream