104 lines
3.4 KiB
Python
104 lines
3.4 KiB
Python
import asyncio
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import multiaddr
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from libp2p.network.connection.raw_connection import RawConnection
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from libp2p.peer.id import id_b58_encode
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from ..listener_interface import IListener
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from ..transport_interface import ITransport
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class TCP(ITransport):
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def __init__(self):
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self.listener = self.Listener()
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class Listener(IListener):
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def __init__(self, handler_function=None):
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self.multiaddrs = []
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self.server = None
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self.handler = handler_function
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async def listen(self, maddr):
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"""
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put listener in listening mode and wait for incoming connections
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:param maddr: maddr of peer
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:return: return True if successful
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"""
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self.server = await asyncio.start_server(
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self.handler,
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maddr.value_for_protocol('ip4'),
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maddr.value_for_protocol('tcp'),
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)
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socket = self.server.sockets[0]
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self.multiaddrs.append(_multiaddr_from_socket(socket))
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return True
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def get_addrs(self):
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"""
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retrieve list of addresses the listener is listening on
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:return: return list of addrs
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"""
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# TODO check if server is listening
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return self.multiaddrs
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def close(self, options=None):
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"""
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close the listener such that no more connections
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can be open on this transport instance
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:param options: optional object potential with timeout
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a timeout value in ms that fires and destroy all connections
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:return: return True if successful
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"""
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if self.server is None:
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return False
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self.server.close()
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_loop = asyncio.get_event_loop()
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_loop.run_until_complete(self.server.wait_closed())
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_loop.close()
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self.server = None
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return True
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async def dial(self, maddr, self_id, options=None):
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"""
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dial a transport to peer listening on multiaddr
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:param maddr: multiaddr of peer
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:param self_id: peer_id of the dialer (to send to receiver)
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:param options: optional object
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:return: True if successful
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"""
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host = maddr.value_for_protocol('ip4')
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port = int(maddr.value_for_protocol('tcp'))
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reader, writer = await asyncio.open_connection(host, port)
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# First: send our peer ID so receiver knows it
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writer.write(id_b58_encode(self_id).encode())
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await writer.drain()
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# Await ack for peer id
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expected_ack_str = "received peer id"
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ack = (await reader.read(len(expected_ack_str))).decode()
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if ack != expected_ack_str:
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raise Exception("Receiver did not receive peer id")
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return RawConnection(host, port, reader, writer, True)
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def create_listener(self, handler_function, options=None):
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"""
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create listener on transport
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:param options: optional object with properties the listener must have
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:param handler_function: a function called when a new connection is received
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that takes a connection as argument which implements interface-connection
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:return: a listener object that implements listener_interface.py
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"""
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return self.Listener(handler_function)
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def _multiaddr_from_socket(socket):
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return multiaddr.Multiaddr("/ip4/%s/tcp/%s" % socket.getsockname())
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