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Limnoria/src/drivers.py

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###
# Copyright (c) 2002-2004, Jeremiah Fincher
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# 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.
# * Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions, and the following disclaimer in the
# 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.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
###
"""
Contains various drivers (network, file, and otherwise) for using IRC objects.
"""
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__revision__ = "$Id$"
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import supybot.fix as fix
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import sys
import time
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import socket
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import supybot.log as supylog
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import supybot.conf as conf
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import supybot.utils as utils
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import supybot.ircmsgs as ircmsgs
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_drivers = {}
_deadDrivers = []
_newDrivers = []
class IrcDriver(object):
"""Base class for drivers."""
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def __init__(self, *args, **kwargs):
add(self.name(), self)
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super(IrcDriver, self).__init__(*args, **kwargs)
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def run(self):
raise NotImplementedError
def die(self):
# The end of any overrided die method should be
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# "super(Class, self).die()", in order to make
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# sure this (and anything else later added) is done.
remove(self.name())
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def reconnect(self, wait=False):
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raise NotImplementedError
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def name(self):
return repr(self)
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class ServersMixin(object):
def __init__(self, irc, servers=()):
self.networkGroup = conf.supybot.networks.get(irc.network)
self.servers = servers
super(ServersMixin, self).__init__(irc)
def _getServers(self):
# We do this, rather than itertools.cycle the servers in __init__,
# because otherwise registry updates given as setValues or sets
# wouldn't be visible until a restart.
return self.networkGroup.servers()[:] # Be sure to copy!
def _getNextServer(self):
if not self.servers:
self.servers = self._getServers()
assert self.servers, 'Servers value for %s is empty.' % \
self.networkGroup._name
server = self.servers.pop(0)
self.currentServer = '%s:%s' % server
return server
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def empty():
"""Returns whether or not the driver loop is empty."""
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return (len(_drivers) + len(_newDrivers)) == 0
def add(name, driver):
"""Adds a given driver the loop with the given name."""
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_newDrivers.append((name, driver))
def remove(name):
"""Removes the driver with the given name from the loop."""
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_deadDrivers.append(name)
def run():
"""Runs the whole driver loop."""
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for (name, driver) in _drivers.iteritems():
try:
if name not in _deadDrivers:
driver.run()
except:
log.exception('Uncaught exception in in drivers.run:')
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_deadDrivers.append(name)
for name in _deadDrivers:
try:
driver = _drivers[name]
if hasattr(driver, 'irc') and driver.irc is not None:
# The Schedule driver has no irc object, or it's None.
driver.irc.driver = None
driver.irc = None
log.info('Removing driver %s.', name)
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del _drivers[name]
except KeyError:
pass
while _newDrivers:
(name, driver) = _newDrivers.pop()
log.debug('Adding new driver %s.', name)
if name in _drivers:
log.warning('Driver %s already added, killing it.', name)
_drivers[name].die()
del _drivers[name]
_drivers[name] = driver
class Log(object):
"""This is used to have a nice, consistent interface for drivers to use."""
def connect(self, server):
self.info('Connecting to %s.', server)
def connectError(self, server, e):
if isinstance(e, Exception):
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if isinstance(e, socket.gaierror):
e = e.args[1]
else:
e = utils.exnToString(e)
self.warning('Error connecting to %s: %s', server, e)
def disconnect(self, server, e=None):
if e:
if isinstance(e, Exception):
e = utils.exnToString(e)
else:
e = str(e)
if not e.endswith('.'):
e += '.'
self.warning('Disconnect from %s: %s', server, e)
else:
self.info('Disconnect from %s.', server)
def reconnect(self, network, when=None):
s = 'Reconnecting to %s' % network
if when is not None:
if not isinstance(when, basestring):
when = self.timestamp(when)
s += ' at %s.' % when
else:
s += '.'
self.info(s)
def die(self, irc):
self.info('Driver for %s dying.', irc)
debug = staticmethod(supylog.debug)
info = staticmethod(supylog.info)
warning = staticmethod(supylog.warning)
error = staticmethod(supylog.warning)
critical = staticmethod(supylog.critical)
timestamp = staticmethod(supylog.timestamp)
exception = staticmethod(supylog.exception)
stat = staticmethod(supylog.stat)
log = Log()
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def newDriver(irc, moduleName=None):
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"""Returns a new driver for the given server using the irc given and using
conf.supybot.driverModule to determine what driver to pick."""
if moduleName is None:
moduleName = conf.supybot.drivers.module()
if moduleName == 'default':
try:
import twistedDrivers
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moduleName = 'supybot.twistedDrivers'
except ImportError:
# We formerly used 'del' here, but 2.4 fixes the bug that we added
# the 'del' for, so we need to make sure we don't complain if the
# module is cleaned up already.
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sys.modules.pop('supybot.twistedDrivers', None)
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moduleName = 'supybot.socketDrivers'
elif not moduleName.startswith('supybot.'):
moduleName = 'supybot.' + moduleName
driverModule = __import__(moduleName, {}, {}, ['not empty'])
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log.debug('Creating new driver for %s.', irc)
driver = driverModule.Driver(irc)
irc.driver = driver
return driver
def parseMsg(s):
start = time.time()
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s = s.strip()
if s:
msg = ircmsgs.IrcMsg(s)
log.stat('Time to parse IrcMsg: %s', time.time()-start)
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msg.tag('receivedAt', start)
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return msg
else:
return None
# vim:set shiftwidth=4 tabstop=8 expandtab textwidth=78: