496 lines
20 KiB
Python
496 lines
20 KiB
Python
#!/usr/bin/env python2
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# -*- coding: utf-8 -*-
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# SàT plugin for managing raw XML log
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# Copyright (C) 2011 Jérôme Poisson (goffi@goffi.org)
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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from sat.core.i18n import _
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from sat.core.constants import Const as C
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from sat.core import exceptions
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from sat.core.log import getLogger
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from twisted.words.protocols.jabber import client as jabber_client
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from twisted.words.protocols.jabber import xmlstream
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from twisted.words.xish import domish
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from twisted.internet import defer
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from twisted.internet import task, reactor
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from functools import partial
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from wokkel import disco, iwokkel
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from zope.interface import implements
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import collections
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import time
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log = getLogger(__name__)
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PLUGIN_INFO = {
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C.PI_NAME: "Stream Management",
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C.PI_IMPORT_NAME: "XEP-0198",
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C.PI_TYPE: "XEP",
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C.PI_MODES: C.PLUG_MODE_BOTH,
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C.PI_PROTOCOLS: ["XEP-0198"],
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C.PI_DEPENDENCIES: [],
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C.PI_MAIN: "XEP_0198",
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C.PI_HANDLER: "yes",
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C.PI_DESCRIPTION: _(u"""Implementation of Stream Management"""),
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}
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NS_SM = u"urn:xmpp:sm:3"
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SM_ENABLED = '/enabled[@xmlns="' + NS_SM + '"]'
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SM_RESUMED = '/resumed[@xmlns="' + NS_SM + '"]'
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SM_FAILED = '/failed[@xmlns="' + NS_SM + '"]'
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SM_R_REQUEST = '/r[@xmlns="' + NS_SM + '"]'
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SM_A_REQUEST = '/a[@xmlns="' + NS_SM + '"]'
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SM_H_REQUEST = '/h[@xmlns="' + NS_SM + '"]'
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# Max number of stanza to send before requesting ack
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MAX_STANZA_ACK_R = 5
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# Max number of seconds before requesting ack
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MAX_DELAY_ACK_R = 30
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MAX_COUNTER = 2**32
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RESUME_MAX = 5*60
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# if we don't have an answer to ACK REQUEST after this delay, connection is aborted
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ACK_TIMEOUT = 35
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class ProfileSessionData(object):
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out_counter = 0
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in_counter = 0
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session_id = None
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location = None
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session_max = None
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# True when an ack answer is expected
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ack_requested = False
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last_ack_r = 0
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disconnected_time = None
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def __init__(self, callback, **kw):
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self.buffer = collections.deque()
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self.buffer_idx = 0
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self._enabled = False
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self.timer = None
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# time used when doing a ack request
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# when it times out, connection is aborted
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self.req_timer = None
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self.callback_data = (callback, kw)
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@property
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def enabled(self):
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return self._enabled
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@enabled.setter
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def enabled(self, enabled):
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if enabled:
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if self._enabled:
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raise exceptions.InternalError(
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u"Stream Management can't be enabled twice")
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self._enabled = True
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callback, kw = self.callback_data
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self.timer = task.LoopingCall(callback, **kw)
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self.timer.start(MAX_DELAY_ACK_R, now=False)
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else:
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self._enabled = False
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if self.timer is not None:
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self.timer.stop()
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self.timer = None
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@property
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def resume_enabled(self):
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return self.session_id is not None
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def reset(self):
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self.enabled = False
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self.buffer.clear()
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self.buffer_idx = 0
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self.in_counter = self.out_counter = 0
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self.session_id = self.location = None
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self.ack_requested = False
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self.last_ack_r = 0
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if self.req_timer is not None:
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if self.req_timer.active():
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log.error(u"req_timer has been called/cancelled but not reset")
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else:
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self.req_timer.cancel()
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self.req_timer = None
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class XEP_0198(object):
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# FIXME: location is not handled yet
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def __init__(self, host):
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log.info(_("Plugin Stream Management initialization"))
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self.host = host
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host.registerNamespace(u'sm', NS_SM)
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host.trigger.add("stream_hooks", self.addHooks)
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host.trigger.add("xml_init", self._XMLInitTrigger)
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host.trigger.add("disconnecting", self._disconnectingTrigger)
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host.trigger.add("disconnected", self._disconnectedTrigger)
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try:
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self._ack_timeout = int(host.memory.getConfig("", "ack_timeout", ACK_TIMEOUT))
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except ValueError:
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log.error(_(u"Invalid ack_timeout value, please check your configuration"))
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self._ack_timeout = ACK_TIMEOUT
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if not self._ack_timeout:
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log.info(_(u"Ack timeout disabled"))
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else:
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log.info(_(u"Ack timeout set to {timeout}s").format(
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timeout=self._ack_timeout))
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def profileConnecting(self, client):
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client._xep_0198_session = ProfileSessionData(callback=self.checkAcks,
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client=client)
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def getHandler(self, client):
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return XEP_0198_handler(self)
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def addHooks(self, client, receive_hooks, send_hooks):
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"""Add hooks to handle in/out stanzas counters"""
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receive_hooks.append(partial(self.onReceive, client=client))
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send_hooks.append(partial(self.onSend, client=client))
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return True
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def _XMLInitTrigger(self, client):
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"""Enable or resume a stream mangement"""
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if not (NS_SM, u'sm') in client.xmlstream.features:
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log.warning(_(
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u"Your server doesn't support stream management ({namespace}), this is "
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u"used to improve connection problems detection (like network outages). "
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u"Please ask your server administrator to enable this feature.".format(
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namespace=NS_SM)))
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return True
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session = client._xep_0198_session
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# a disconnect timer from a previous disconnection may still be active
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try:
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disconnect_timer = session.disconnect_timer
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except AttributeError:
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pass
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else:
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if disconnect_timer.active():
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disconnect_timer.cancel()
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del session.disconnect_timer
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if session.resume_enabled:
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# we are resuming a session
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resume_elt = domish.Element((NS_SM, 'resume'))
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resume_elt['h'] = unicode(session.in_counter)
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resume_elt['previd'] = session.session_id
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client.send(resume_elt)
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session.resuming = True
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# session.enabled will be set on <resumed/> reception
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return False
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else:
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# we start a new session
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assert session.out_counter == 0
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enable_elt = domish.Element((NS_SM, 'enable'))
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enable_elt[u'resume'] = u'true'
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client.send(enable_elt)
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session.enabled = True
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return True
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def _disconnectingTrigger(self, client):
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session = client._xep_0198_session
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if session.enabled:
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self.sendAck(client)
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# This is a requested disconnection, so we can reset the session
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# to disable resuming and close normally the stream
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session.reset()
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return True
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def _disconnectedTrigger(self, client, reason):
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if client.is_component:
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return True
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session = client._xep_0198_session
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session.enabled = False
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if session.resume_enabled:
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session.disconnected_time = time.time()
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session.disconnect_timer = reactor.callLater(session.session_max,
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client.disconnectProfile,
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reason)
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# disconnectProfile must not be called at this point
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# because session can be resumed
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return False
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else:
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return True
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def checkAcks(self, client):
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"""Request ack if needed"""
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session = client._xep_0198_session
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# log.debug("checkAcks (in_counter={}, out_counter={}, buf len={}, buf idx={})"
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# .format(session.in_counter, session.out_counter, len(session.buffer),
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# session.buffer_idx))
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if session.ack_requested or not session.buffer:
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return
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if (session.out_counter - session.buffer_idx >= MAX_STANZA_ACK_R
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or time.time() - session.last_ack_r >= MAX_DELAY_ACK_R):
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self.requestAck(client)
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session.ack_requested = True
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session.last_ack_r = time.time()
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def updateBuffer(self, session, server_acked):
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"""Update buffer and buffer_index"""
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if server_acked > session.buffer_idx:
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diff = server_acked - session.buffer_idx
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for i in xrange(diff):
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session.buffer.pop()
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session.buffer_idx += diff
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def sendAck(self, client):
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"""Send an answer element with current IN counter"""
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a_elt = domish.Element((NS_SM, 'a'))
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a_elt['h'] = unicode(client._xep_0198_session.in_counter)
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client.send(a_elt)
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def requestAck(self, client):
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"""Send a request element"""
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session = client._xep_0198_session
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r_elt = domish.Element((NS_SM, 'r'))
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client.send(r_elt)
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if session.req_timer is not None:
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raise exceptions.InternalError("req_timer should not be set")
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if self._ack_timeout:
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session.req_timer = reactor.callLater(self._ack_timeout, self.onAckTimeOut,
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client)
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def _connectionFailed(self, failure_, connector):
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normal_host, normal_port = connector.normal_location
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del connector.normal_location
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log.warning(_(
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u"Connection failed using location given by server (host: {host}, port: "
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u"{port}), switching to normal host and port (host: {normal_host}, port: "
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u"{normal_port})".format(host=connector.host, port=connector.port,
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normal_host=normal_host, normal_port=normal_port)))
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connector.host, connector.port = normal_host, normal_port
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connector.connectionFailed = connector.connectionFailed_ori
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del connector.connectionFailed_ori
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return connector.connectionFailed(failure_)
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def onEnabled(self, enabled_elt, client):
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session = client._xep_0198_session
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session.in_counter = 0
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# we check that resuming is possible and that we have a session id
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resume = C.bool(enabled_elt.getAttribute(u'resume'))
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session_id = enabled_elt.getAttribute(u'id')
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if not session_id:
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log.warning(_(u'Incorrect <enabled/> element received, no "id" attribute'))
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if not resume or not session_id:
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log.warning(_(
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u"You're server doesn't support session resuming with stream management, "
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u"please contact your server administrator to enable it"))
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return
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session.session_id = session_id
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# XXX: we disable resource binding, which must not be done
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# when we resume the session.
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client.factory.authenticator.res_binding = False
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# location, in case server want resuming session to be elsewhere
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try:
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location = enabled_elt[u'location']
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except KeyError:
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pass
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else:
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# TODO: handle IPv6 here (in brackets, cf. XEP)
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try:
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domain, port = location.split(':', 1)
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port = int(port)
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except ValueError:
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log.warning(_(u"Invalid location received: {location}")
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.format(location=location))
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else:
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session.location = (domain, port)
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# we monkey patch connector to use the new location
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connector = client.xmlstream.transport.connector
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connector.normal_location = connector.host, connector.port
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connector.host = domain
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connector.port = port
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connector.connectionFailed_ori = connector.connectionFailed
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connector.connectionFailed = partial(self._connectionFailed,
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connector=connector)
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# resuming time
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try:
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max_s = int(enabled_elt[u'max'])
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except (ValueError, KeyError) as e:
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if isinstance(e, ValueError):
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log.warning(_(u'Invalid "max" attribute'))
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max_s = RESUME_MAX
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log.info(_(u"Using default session max value ({max_s} s).".format(
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max_s=max_s)))
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log.info(_(u"Stream Management enabled"))
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else:
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log.info(_(
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u"Stream Management enabled, with a resumption time of {res_m} min"
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.format(res_m = max_s/60)))
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session.session_max = max_s
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def onResumed(self, enabled_elt, client):
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session = client._xep_0198_session
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assert not session.enabled
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del session.resuming
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server_acked = int(enabled_elt['h'])
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self.updateBuffer(session, server_acked)
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resend_count = len(session.buffer)
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# we resend all stanza which have not been received properly
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while True:
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try:
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stanza = session.buffer.pop()
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except IndexError:
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break
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else:
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client.send(stanza)
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# now we can continue the session
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session.enabled = True
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d_time = time.time() - session.disconnected_time
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log.info(_(u"Stream session resumed (disconnected for {d_time} s, {count} "
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u"stanza(s) resent)").format(d_time=int(d_time), count=resend_count))
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def onFailed(self, failed_elt, client):
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session = client._xep_0198_session
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condition_elt = failed_elt.firstChildElement()
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session.reset()
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try:
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del session.resuming
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except AttributeError:
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# stream management can't be started at all
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msg = _(u"Can't use stream management")
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if condition_elt is None:
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log.error(msg + u'.')
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else:
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log.error(_(u"{msg}: {reason}").format(
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msg=msg, reason=condition_elt.name))
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else:
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# only stream resumption failed, we can try full session init
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# XXX: we try to start full session init from this point, with many
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# variables/attributes already initialised with a potentially different
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# jid. This is experimental and may not be safe. It may be more
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# secured to abord the connection and restart everything with a fresh
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# client.
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msg = _(u"stream resumption not possible, restarting full session")
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if condition_elt is None:
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log.warning(u'{msg}.'.format(msg=msg))
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else:
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log.warning(u"{msg}: {reason}".format(
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msg=msg, reason=condition_elt.name))
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# stream resumption failed, but we still can do normal stream management
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# we restore attributes as if the session was new, and init stream
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# we keep everything initialized, and only do binding, roster request
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# and initial presence sending.
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if client.conn_deferred.called:
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client.conn_deferred = defer.Deferred()
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else:
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log.error(u"conn_deferred should be called at this point")
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# we need to recreate roster
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client.handlers.remove(client.roster)
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client.roster = client.roster.__class__(self.host)
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client.roster.setHandlerParent(client)
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# bind init is not done when resuming is possible, so we have to do it now
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bind_init = jabber_client.BindInitializer(client.xmlstream)
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bind_init.required = True
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d = bind_init.start()
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# we set the jid, which may have changed
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d.addCallback(lambda __: setattr(client.factory.authenticator, "jid", client.jid))
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# we call the trigger who will send the <enable/> element
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d.addCallback(lambda __: self._XMLInitTrigger(client))
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# then we have to re-request the roster, as changes may have occured
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d.addCallback(lambda __: client.roster.requestRoster())
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# we add got_roster to be sure to have roster before sending initial presence
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d.addCallback(lambda __: client.roster.got_roster)
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# initial presence must be sent manually
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d.addCallback(lambda __: client.presence.available())
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def onReceive(self, element, client):
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if not client.is_component:
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session = client._xep_0198_session
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if session.enabled and element.name.lower() in C.STANZA_NAMES:
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session.in_counter += 1 % MAX_COUNTER
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def onSend(self, obj, client):
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if not client.is_component:
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session = client._xep_0198_session
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if (session.enabled
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and domish.IElement.providedBy(obj)
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and obj.name.lower() in C.STANZA_NAMES):
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session.out_counter += 1 % MAX_COUNTER
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session.buffer.appendleft(obj)
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self.checkAcks(client)
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def onAckRequest(self, r_elt, client):
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self.sendAck(client)
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def onAckAnswer(self, a_elt, client):
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session = client._xep_0198_session
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session.ack_requested = False
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if self._ack_timeout:
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if session.req_timer is None:
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log.error("reg_timer should be set")
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else:
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session.req_timer.cancel()
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session.req_timer = None
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try:
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server_acked = int(a_elt['h'])
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except ValueError:
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log.warning(_(u"Server returned invalid ack element, disabling stream "
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u"management: {xml}").format(xml=a_elt))
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session.enabled = False
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return
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if server_acked > session.out_counter:
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log.error(_(u"Server acked more stanzas than we have sent, disabling stream "
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u"management."))
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session.reset()
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return
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self.updateBuffer(session, server_acked)
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self.checkAcks(client)
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def onAckTimeOut(self, client):
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"""Called when a requested ACK has not been received in time"""
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log.info(_(u"Ack was not received in time, aborting connection"))
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client.xmlstream.transport.abortConnection()
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client._xep_0198_session.req_timer = None
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class XEP_0198_handler(xmlstream.XMPPHandler):
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implements(iwokkel.IDisco)
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def __init__(self, plugin_parent):
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self.plugin_parent = plugin_parent
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self.host = plugin_parent.host
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def connectionInitialized(self):
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self.xmlstream.addObserver(
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SM_ENABLED, self.plugin_parent.onEnabled, client=self.parent
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)
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self.xmlstream.addObserver(
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SM_RESUMED, self.plugin_parent.onResumed, client=self.parent
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)
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self.xmlstream.addObserver(
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SM_FAILED, self.plugin_parent.onFailed, client=self.parent
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)
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self.xmlstream.addObserver(
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SM_R_REQUEST, self.plugin_parent.onAckRequest, client=self.parent
|
|
)
|
|
self.xmlstream.addObserver(
|
|
SM_A_REQUEST, self.plugin_parent.onAckAnswer, client=self.parent
|
|
)
|
|
|
|
def getDiscoInfo(self, requestor, target, nodeIdentifier=""):
|
|
return [disco.DiscoFeature(NS_SM)]
|
|
|
|
def getDiscoItems(self, requestor, target, nodeIdentifier=""):
|
|
return []
|