py-libp2p/network/tcp.py

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2018-11-01 05:31:00 +08:00
import asyncio
from .transport_interface import ITransport
from .listener_interface import IListener
class TCP(ITransport):
def __init__(self):
self.listener = self.Listener()
class Listener(IListener):
def __init__(self, handler_function=None):
self.multiaddrs = []
self.server = None
self.handler = staticmethod(handler_function)
def listen(self, multiaddr):
"""
put listener in listening mode and wait for incoming connections
:param multiaddr: multiaddr of peer
:return: return True if successful
"""
# TODO check for exceptions
_multiaddr = multiaddr
if "ipfs" in multiaddr.get_protocols():
# ipfs_id = multiaddr.get_ipfs_id()
_multiaddr = multiaddr.remove_protocol("ipfs")
self.multiaddrs.append(_multiaddr)
_multiaddr_dict = _multiaddr.to_dict()
_loop = asyncio.get_event_loop()
_coroutine = asyncio.start_server(self.handler, _multiaddr_dict.host,\
_multiaddr_dict.port, loop=_loop)
self.server = _loop.run_until_complete(_coroutine)
return True
def get_addrs(self):
"""
retrieve list of addresses the listener is listening on
:return: return list of addrs
"""
# TODO check if server is listening
return self.multiaddrs
def close(self, options=None):
"""
close the listener such that no more connections
can be open on this transport instance
:param options: optional object potential with timeout
a timeout value in ms that fires and destroy all connections
:return: return True if successful
"""
if self.server is None:
return False
self.server.close()
_loop = asyncio.get_event_loop()
_loop.run_until_complete(self.server.wait_closed())
_loop.close()
self.server = None
return True
def dial(self, multiaddr, options=None):
"""
dial a transport to peer listening on multiaddr
:param multiaddr: multiaddr of peer
:param options: optional object
:return: True if successful
"""
_multiaddr_dict = multiaddr.to_dict()
reader, writer = await asyncio.open_connection(_multiaddr_dict.host,\
_multiaddr_dict.port)
return False
# TODO dial behavior not fully understood
def create_listener(self, handler_function, options=None):
"""
create listener on transport
:param options: optional object with properties the listener must have
:param handler_function: a function called when a new conntion is received
that takes a connection as argument which implements interface-connection
:return: a listener object that implements listener_interface.py
"""
return self.Listener(handler_function)