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`create_observer` takes a deferred and create a new deferred that *observers* the original deferred. Any callbacks added to the observing deferred will *not* affect the origin deferred.
54 lines
1.4 KiB
Python
54 lines
1.4 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014, 2015 OpenMarket Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from twisted.internet import defer, reactor
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from .logcontext import PreserveLoggingContext
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@defer.inlineCallbacks
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def sleep(seconds):
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d = defer.Deferred()
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reactor.callLater(seconds, d.callback, seconds)
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with PreserveLoggingContext():
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yield d
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def run_on_reactor():
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""" This will cause the rest of the function to be invoked upon the next
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iteration of the main loop
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"""
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return sleep(0)
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def create_observer(deferred):
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"""Creates a deferred that observes the result or failure of the given
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deferred *without* affecting the given deferred.
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"""
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d = defer.Deferred()
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def callback(r):
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d.callback(r)
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return r
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def errback(f):
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d.errback(f)
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return f
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deferred.addCallbacks(callback, errback)
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return d
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