110 lines
3.5 KiB
Python
110 lines
3.5 KiB
Python
import asyncio
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from .utils import encode_uvarint, decode_uvarint
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from .muxed_connection_interface import IMuxedConn
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from .muxed_stream import MuxedStream
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class MuxedConn(IMuxedConn):
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"""
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reference: https://github.com/libp2p/go-mplex/blob/master/multiplex.go
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"""
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def __init__(self, conn, initiator):
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"""
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create a new muxed connection
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:param conn: an instance of raw connection
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:param initiator: boolean to prevent multiplex with self
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"""
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self.raw_conn = conn
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self.initiator = initiator
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self.buffers = {}
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self.streams = {}
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self.stream_queue = asyncio.Queue()
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asyncio.ensure_future(self.handle_incoming())
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def close(self):
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"""
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close the stream muxer and underlying raw connection
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"""
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self.raw_conn.close()
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def is_closed(self):
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"""
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check connection is fully closed
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:return: true if successful
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"""
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pass
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async def read_buffer(self, stream_id):
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# Empty buffer or nonexistent stream
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# TODO: propagate up timeout exception and catch
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if stream_id not in self.buffers or not self.buffers[stream_id]:
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await self.handle_incoming()
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data = self.buffers[stream_id]
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self.buffers[stream_id] = bytearray()
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return data
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def open_stream(self, protocol_id, stream_id, peer_id, multi_addr):
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"""
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creates a new muxed_stream
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:return: a new stream
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"""
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stream = MuxedStream(stream_id, multi_addr, self)
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self.streams[stream_id] = stream
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return stream
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async def accept_stream(self):
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"""
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accepts a muxed stream opened by the other end
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:return: the accepted stream
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"""
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# TODO update to pull out protocol_id from message
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protocol_id = "/echo/1.0.0"
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stream_id = await self.stream_queue.get()
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stream = MuxedStream(stream_id, False, self)
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return stream, stream_id, protocol_id
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async def send_message(self, flag, data, stream_id):
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"""
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sends a message over the connection
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:param header: header to use
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:param data: data to send in the message
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:param stream_id: stream the message is in
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:return: True if success
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"""
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# << by 3, then or with flag
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header = (stream_id << 3) | flag
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header = encode_uvarint(header)
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data_length = encode_uvarint(len(data))
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_bytes = header + data_length + data
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return await self.write_to_stream(_bytes)
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async def write_to_stream(self, _bytes):
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self.raw_conn.writer.write(_bytes)
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await self.raw_conn.writer.drain()
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return len(_bytes)
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async def handle_incoming(self):
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data = bytearray()
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try:
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chunk = await asyncio.wait_for(self.raw_conn.reader.read(1024), timeout=5)
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data += chunk
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header, end_index = decode_uvarint(data, 0)
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length, end_index = decode_uvarint(data, end_index)
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message = data[end_index:end_index + length + 1]
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# Deal with other types of messages
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flag = header & 0x07
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stream_id = header >> 3
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if stream_id not in self.buffers:
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self.buffers[stream_id] = message
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await self.stream_queue.put(stream_id)
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else:
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self.buffers[stream_id] = self.buffers[stream_id] + message
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except asyncio.TimeoutError:
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print('timeout!')
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