104 lines
2.8 KiB
Python
104 lines
2.8 KiB
Python
"""
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SleekXMPP: The Sleek XMPP Library
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Copyright (C) 2010 Nathanael C. Fritz
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This file is part of SleekXMPP.
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See the file LICENSE for copying permission.
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"""
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import logging
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try:
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import queue
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except ImportError:
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import Queue as queue
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from sleekxmpp.xmlstream import StanzaBase
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from sleekxmpp.xmlstream.handler.base import BaseHandler
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log = logging.getLogger(__name__)
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class Waiter(BaseHandler):
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"""
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The Waiter handler allows an event handler to block
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until a particular stanza has been received. The handler
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will either be given the matched stanza, or False if the
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waiter has timed out.
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Methods:
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check_delete -- Overrides BaseHandler.check_delete
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prerun -- Overrides BaseHandler.prerun
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run -- Overrides BaseHandler.run
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wait -- Wait for a stanza to arrive and return it to
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an event handler.
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"""
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def __init__(self, name, matcher, stream=None):
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"""
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Create a new Waiter.
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Arguments:
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name -- The name of the waiter.
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matcher -- A matcher object to detect the desired stanza.
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stream -- Optional XMLStream instance to monitor.
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"""
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BaseHandler.__init__(self, name, matcher, stream=stream)
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self._payload = queue.Queue()
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def prerun(self, payload):
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"""
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Store the matched stanza.
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Overrides BaseHandler.prerun
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Arguments:
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payload -- The matched stanza object.
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"""
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self._payload.put(payload)
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def run(self, payload):
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"""
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Do not process this handler during the main event loop.
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Overrides BaseHandler.run
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Arguments:
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payload -- The matched stanza object.
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"""
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pass
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def wait(self, timeout=None):
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"""
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Block an event handler while waiting for a stanza to arrive.
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Be aware that this will impact performance if called from a
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non-threaded event handler.
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Will return either the received stanza, or False if the waiter
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timed out.
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Arguments:
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timeout -- The number of seconds to wait for the stanza to
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arrive. Defaults to the global default timeout
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value sleekxmpp.xmlstream.RESPONSE_TIMEOUT.
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"""
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if timeout is None:
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timeout = self.stream().response_timeout
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try:
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stanza = self._payload.get(True, timeout)
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except queue.Empty:
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stanza = False
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log.warning("Timed out waiting for %s", self.name)
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self.stream().remove_handler(self.name)
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return stanza
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def check_delete(self):
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"""
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Always remove waiters after use.
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Overrides BaseHandler.check_delete
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"""
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return True
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