async def _read_pubsub_msg() -> None:
writer_closed_task = asyncio.ensure_future(writer.wait_closed())
while True:
done, pending = await asyncio.wait(
[read_varint_prefixed_bytes(reader), writer_closed_task],
return_when=asyncio.FIRST_COMPLETED,
)
done_tasks = tuple(done)
if writer.is_closing():
return
read_task = done_tasks[0]
# Sanity check
assert read_task._coro.__name__ == "read_varint_prefixed_bytes"
msg_bytes = read_task.result()
ps_msg = p2pd_pb2.PSMessage()
ps_msg.ParseFromString(msg_bytes)
# Fill in the message used in py-libp2p
msg = rpc_pb2.Message(
from_id=ps_msg.from_id,
data=ps_msg.data,
seqno=ps_msg.seqno,
topicIDs=ps_msg.topicIDs,
signature=ps_msg.signature,
key=ps_msg.key,
)
queue.put_nowait(msg)
async def read_message(self) -> Tuple[int, int, bytes]:
"""
Read a single message off of the secured connection
:return: stream_id, flag, message contents
"""
# FIXME: No timeout is used in Go implementation.
try:
header = await decode_uvarint_from_stream(self.secured_conn)
message = await asyncio.wait_for(read_varint_prefixed_bytes(
self.secured_conn),
timeout=5)
except (ParseError, RawConnError, IncompleteReadError) as error:
raise MplexUnavailable(
"failed to read messages correctly from the underlying connection"
) from error
except asyncio.TimeoutError as error:
raise MplexUnavailable(
"failed to read more message body within the timeout"
) from error
flag = header & 0x07
channel_id = header >> 3
return channel_id, flag, message
async def read_message(self) -> Tuple[int, int, bytes]:
"""
Read a single message off of the secured connection
:return: stream_id, flag, message contents
"""
# FIXME: No timeout is used in Go implementation.
# Timeout is set to a relatively small value to alleviate wait time to exit
# loop in handle_incoming
try:
header = await decode_uvarint_from_stream(self.secured_conn)
except ParseError:
return None, None, None
try:
message = await asyncio.wait_for(
read_varint_prefixed_bytes(self.secured_conn), timeout=5
)
except (ParseError, IncompleteReadError, asyncio.TimeoutError):
# TODO: Investigate what we should do if time is out.
return None, None, None
flag = header & 0x07
channel_id = header >> 3
return channel_id, flag, message