Limnoria/src/drivers/Twisted.py

###
# Copyright (c) 2002-2004, Jeremiah Fincher
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
#   * Redistributions of source code must retain the above copyright notice,
#     this list of conditions, and the following disclaimer.
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#     documentation and/or other materials provided with the distribution.
#   * Neither the name of the author of this software nor the name of
#     contributors to this software may be used to endorse or promote products
#     derived from this software without specific prior written consent.
#
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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###



import time

import supybot.log as log
import supybot.conf as conf
import supybot.ircdb as ircdb
import supybot.drivers as drivers
import supybot.ircmsgs as ircmsgs

from twisted.internet import reactor, error, ssl
from twisted.protocols.basic import LineReceiver
from twisted.internet.protocol import ReconnectingClientFactory

try:
    from OpenSSL import SSL
except ImportError:
    drivers.log.debug('PyOpenSSL is not available, can not connect to SSL servers.')

class TwistedRunnerDriver(drivers.IrcDriver):
    def name(self):
        return self.__class__.__name__

    def run(self):
        try:
            reactor.iterate(conf.supybot.drivers.poll())
        except:
            drivers.log.exception('Uncaught exception outside reactor:')

class SupyIrcProtocol(LineReceiver):
    delimiter = '\n'
    MAX_LENGTH = 1024
    def __init__(self):
        self.mostRecentCall = reactor.callLater(1, self.checkIrcForMsgs)

    def lineReceived(self, line):
        start = time.time()
        msg = drivers.parseMsg(line)
        if msg is not None:
            self.irc.feedMsg(msg)

    def checkIrcForMsgs(self):
        if self.connected:
            msg = self.irc.takeMsg()
            if msg:
                self.transport.write(str(msg))
        self.mostRecentCall = reactor.callLater(1, self.checkIrcForMsgs)

    def connectionLost(self, r):
        self.mostRecentCall.cancel()
        if r.check(error.ConnectionDone):
            drivers.log.disconnect(self.factory.currentServer)
        else:
            drivers.log.disconnect(self.factory.currentServer, errorMsg(r))
        if self.irc.zombie:
            self.factory.continueTrying = False
            while self.irc.takeMsg():
                continue
        else:
            self.irc.reset()

    def connectionMade(self):
        self.factory.resetDelay()
        self.irc.driver = self

    def die(self):
        drivers.log.die(self.irc)
        self.factory.continueTrying = False
        self.transport.loseConnection()

    def reconnect(self, wait=None):
        # We ignore wait here, because we handled our own waiting.
        drivers.log.reconnect(self.irc.network)
        self.transport.loseConnection()

def errorMsg(reason):
    return reason.getErrorMessage()

class SupyReconnectingFactory(ReconnectingClientFactory, drivers.ServersMixin):
    # XXX Shouldn't the maxDelay be configurable?
    maxDelay = 300
    protocol = SupyIrcProtocol
    def __init__(self, irc):
        self.irc = irc
        drivers.ServersMixin.__init__(self, irc)
        (server, port) = self._getNextServer()
        vhost = conf.supybot.protocols.irc.vhost()
        if self.networkGroup.get('ssl').value:
            self.connectSSL(server, port, vhost)
        else:
            self.connectTCP(server, port, vhost)

    def connectTCP(self, server, port, vhost):
        """Connect to the server with a standard TCP connection."""
        reactor.connectTCP(server, port, self, bindAddress=(vhost, 0))

    def connectSSL(self, server, port, vhost):
        """Connect to the server using an SSL socket."""
        drivers.log.debug('Attempting an SSL connection.')
        reactor.connectSSL(server, port, self,
                        ssl.ClientContextFactory(), bindAddress=(vhost, 0))
                    
    def clientConnectionFailed(self, connector, r):
        drivers.log.connectError(self.currentServer, errorMsg(r))
        (connector.host, connector.port) = self._getNextServer()
        if not r.check(error.TimeoutError):
            ReconnectingClientFactory.clientConnectionFailed(self, connector,r)

    def clientConnectionLost(self, connector, r):
        (connector.host, connector.port) = self._getNextServer()
        ReconnectingClientFactory.clientConnectionLost(self, connector, r)

    def startedConnecting(self, connector):
        drivers.log.connect(self.currentServer)

    def buildProtocol(self, addr):
        protocol = ReconnectingClientFactory.buildProtocol(self, addr)
        protocol.irc = self.irc
        return protocol

Driver = SupyReconnectingFactory

try:
    ignore(poller)
except NameError:
    poller = TwistedRunnerDriver()
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