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79 lines
2.9 KiB
Python
79 lines
2.9 KiB
Python
# -*- coding: utf-8 -*-
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"""
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sleekxmpp.xmlstream.handler.callback
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Part of SleekXMPP: The Sleek XMPP Library
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:copyright: (c) 2011 Nathanael C. Fritz
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:license: MIT, see LICENSE for more details
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"""
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from sleekxmpp.xmlstream.handler.base import BaseHandler
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class Callback(BaseHandler):
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"""
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The Callback handler will execute a callback function with
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matched stanzas.
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The handler may execute the callback either during stream
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processing or during the main event loop.
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Callback functions are all executed in the same thread, so be aware if
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you are executing functions that will block for extended periods of
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time. Typically, you should signal your own events using the SleekXMPP
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object's :meth:`~sleekxmpp.xmlstream.xmlstream.XMLStream.event()`
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method to pass the stanza off to a threaded event handler for further
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processing.
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:param string name: The name of the handler.
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:param matcher: A :class:`~sleekxmpp.xmlstream.matcher.base.MatcherBase`
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derived object for matching stanza objects.
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:param pointer: The function to execute during callback.
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:param bool thread: **DEPRECATED.** Remains only for
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backwards compatibility.
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:param bool once: Indicates if the handler should be used only
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once. Defaults to False.
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:param bool instream: Indicates if the callback should be executed
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during stream processing instead of in the
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main event loop.
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:param stream: The :class:`~sleekxmpp.xmlstream.xmlstream.XMLStream`
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instance this handler should monitor.
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"""
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def __init__(self, name, matcher, pointer, thread=False,
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once=False, instream=False, stream=None):
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BaseHandler.__init__(self, name, matcher, stream)
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self._pointer = pointer
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self._once = once
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self._instream = instream
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def prerun(self, payload):
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"""Execute the callback during stream processing, if
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the callback was created with ``instream=True``.
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:param payload: The matched
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:class:`~sleekxmpp.xmlstream.stanzabase.ElementBase` object.
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"""
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if self._once:
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self._destroy = True
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if self._instream:
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self.run(payload, True)
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def run(self, payload, instream=False):
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"""Execute the callback function with the matched stanza payload.
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:param payload: The matched
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:class:`~sleekxmpp.xmlstream.stanzabase.ElementBase` object.
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:param bool instream: Force the handler to execute during stream
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processing. This should only be used by
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:meth:`prerun()`. Defaults to ``False``.
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"""
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if not self._instream or instream:
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self._pointer(payload)
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if self._once:
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self._destroy = True
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del self._pointer
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