Limnoria/src/socketDrivers.py

#!/usr/bin/env python

###
# Copyright (c) 2002, Jeremiah Fincher
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###

"""
Contains simple socket drivers.  Asyncore bugged (haha, pun!) me.
"""

from __future__ import division

__revision__ ="$Id$"

import fix

import time
import socket
from itertools import imap

import log
import conf
import drivers
import ircmsgs
import schedule

instances = 0
originalPoll = conf.poll

class SocketDriver(drivers.IrcDriver):
    def __init__(self, (server, port), irc, reconnectWaits=(0, 60, 300)):
        global instances
        instances += 1
        conf.poll = originalPoll / instances
        self.server = (server, port)
        drivers.IrcDriver.__init__(self) # Must come after server is set.
        self.irc = irc
        self.irc.driver = self
        self.inbuffer = ''
        self.outbuffer = ''
        self.connected = False
        self.reconnectWaitsIndex = 0
        self.reconnectWaits = reconnectWaits
        self.reconnect()

    def _sendIfMsgs(self):
        msgs = [self.irc.takeMsg()]
        while msgs[-1] is not None:
            msgs.append(self.irc.takeMsg())
        del msgs[-1]
        self.outbuffer += ''.join(imap(str, msgs))
        if self.outbuffer:
            try:
                sent = self.conn.send(self.outbuffer)
                self.outbuffer = self.outbuffer[sent:]
            except socket.error, e:
                # (11, 'Resource temporarily unavailable') raised if connect
                # hasn't finished yet.
                if e.args[0] != 11:
                    log.warning('Disconnect from %s: %s',self.server,e.args[1])
                    self.die()
        
    def run(self):
        if not self.connected:
            time.sleep(conf.poll) # Otherwise we might spin.
            return
        self._sendIfMsgs()
        try:
            self.inbuffer += self.conn.recv(1024)
            lines = self.inbuffer.split('\n')
            self.inbuffer = lines.pop()
            for line in lines:
                start = time.time()
                msg = ircmsgs.IrcMsg(line)
                log.verbose('Time to parse IrcMsg: %s', time.time()-start)
                try:
                    self.irc.feedMsg(msg)
                except:
                    log.exception('Uncaught exception outside Irc object:')
        except socket.timeout:
            pass
        except socket.error, e:
            # Same as with _sendIfMsgs.
            if e.args[0] != 11:
                log.warning('Disconnect from %s: %s', self.server, e.args[1])
                self.die()
            return
        self._sendIfMsgs()
        
    def reconnect(self):
        self.conn = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        self.conn.settimeout(conf.poll*10) # Allow more time for connect.
        if self.reconnectWaitsIndex < len(self.reconnectWaits)-1:
            self.reconnectWaitsIndex += 1
        try:
            self.conn.connect(self.server)
            self.conn.settimeout(conf.poll)
        except socket.error, e:
            if e.args[0] != 115:
                log.warning('Error connecting to %s: %s', self.server, e)
                self.die()
        self.connected = True
        self.reconnectWaitPeriodsIndex = 0
        

    def die(self):
        self.irc.reset()
        self.conn.close()
        self.connected = False
        when = time.time() + self.reconnectWaits[self.reconnectWaitsIndex]
        whenS = time.strftime(conf.logTimestampFormat, time.localtime(when))
        log.info('Scheduling reconnect to %s at %s', self.server, whenS)
        schedule.addEvent(self.reconnect, when)

    def name(self):
        return '%s%s' % (self.__class__.__name__, self.server)


Driver = SocketDriver

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