146 lines
4.7 KiB
Python
146 lines
4.7 KiB
Python
# -*- coding: utf-8 -*-
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import asyncio
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import inspect
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import logging
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logging.basicConfig(format="[%(asctime)s] [%(levelname)s] %(message)s", level=logging.DEBUG, datefmt="%d.%m.%Y %H:%M:%S")
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logger = logging.getLogger(__name__)
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class ManagedProtocol(asyncio.Protocol):
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"""Basic managed protocol handler, registers itself to ConnectionManager.
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Inherit this to overlay the management with actual protocol parsing.
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"""
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def __init__(self, loop, connection_manager, endpoint):
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self._loop = loop
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self._connection_manager = connection_manager
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self._endpoint = endpoint
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self._transport = None
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def _log(self, msg):
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host, port = self._endpoint
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logger.info("[{}:{}] ".format(host, port)+str(msg))
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def connection_made(self, transport):
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self._connection_manager.register_active_connection(self._endpoint, self)
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self._transport = transport
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self._log("Connection made!")
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host, port = transport.get_extra_info("peername")
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self._log("Connected to: {}:{}".format(host, port))
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def data_received(self, data):
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self._log("[R] "+str(data))
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def eof_received(self):
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self._log("Eof received!")
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def connection_lost(self, exc):
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self._log("Connection lost! ("+str(exc)+")")
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self._connection_manager.unregister_active_connection(self._endpoint)
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def send_data(self, data):
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self._log("[W] "+str(data))
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self._transport.write(data)
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def destroy(self):
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""" Triggered by ConnectionManager.remove_endpoint(). Closes transport. """
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self._transport.close()
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class IrcProtocol(ManagedProtocol):
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"""Implementation of the IRC protocol.
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"""
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def __init__(self, loop, connection_manager, endpoint):
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super(IrcProtocol, self).__init__(loop, connection_manager, endpoint)
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self._loop = loop
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self.motd = False
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self.hello = False
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def connection_made(self, transport):
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super(IrcProtocol, self).connection_made(transport)
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self.send_data(b"USER as as as :as\r\n")
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self.send_data(b"NICK Pb42\r\n")
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pass
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def data_received(self, data):
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super(IrcProtocol, self).data_received(data)
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pass
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def eof_received(self):
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super(IrcProtocol, self).eof_received()
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pass
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def connection_lost(self, exc):
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super(IrcProtocol, self).connection_lost()
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pass
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class ConnectionManager(object):
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"""Takes care of known endpoints that a connections shall be established to.
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"""
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def __init__(self, loop):
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self._loop = loop
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self._endpoints = []
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self._active_connections = {}
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self._loop.set_exception_handler(self._handle_async_exception)
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def add_endpoint(self, endpoint):
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logger.debug("Endpoint added: {}:{}".format(*endpoint))
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self._endpoints.append(endpoint)
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self._create_connection(endpoint)
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def _create_connection(self, endpoint):
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protocol = IrcProtocol(self._loop, self, endpoint)
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coroutine = self._loop.create_connection(lambda: protocol, *endpoint)
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asyncio.async(coroutine)
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def remove_endpoint(self, endpoint):
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logger.debug("Endpoint removed: {}:{}".format(*endpoint))
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self._endpoints.remove(endpoint)
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if endpoint in self._active_connections:
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self._active_connections[endpoint].close()
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def register_active_connection(self, endpoint, protocol):
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self._active_connections[endpoint] = protocol
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def unregister_active_connection(self, endpoint):
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del self._active_connections[endpoint]
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self._create_connection(endpoint)
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def _handle_async_exception(self, loop, context):
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"""Trying to take care of connection related exceptions."""
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logger.error("An async exception has been caught: "+str(context["exception"]))
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stack = context["future"].get_stack()
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if len(stack) > 1 and stack[1].f_code.co_name == "create_connection":
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last_stackframe = stack[len(stack)-1]
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call_args = inspect.getargvalues(last_stackframe)
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host = call_args.locals["host"]
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port = call_args.locals["port"]
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logger.error("Bad endpoint: {}:{}".format(host, port))
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self.remove_endpoint((host, port))
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else:
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loop.call_exception_handler(context)
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if __name__ == "__main__":
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freenode = ("irc.freenode.net", 6667)
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euirc = ("irc.euirc.net", 6667)
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loop = asyncio.get_event_loop()
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connection_manager = ConnectionManager(loop)
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connection_manager.add_endpoint(euirc)
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connection_manager.add_endpoint(freenode)
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try:
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loop.run_forever()
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except KeyboardInterrupt:
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pass
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finally:
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loop.close()
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