166 lines
4.5 KiB
Python
166 lines
4.5 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014-2016 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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import logging
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import re
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from itertools import islice
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import attr
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from twisted.internet import defer, task
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from synapse.util.logcontext import PreserveLoggingContext
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logger = logging.getLogger(__name__)
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def unwrapFirstError(failure):
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# defer.gatherResults and DeferredLists wrap failures.
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failure.trap(defer.FirstError)
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return failure.value.subFailure
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@attr.s
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class Clock(object):
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"""
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A Clock wraps a Twisted reactor and provides utilities on top of it.
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Args:
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reactor: The Twisted reactor to use.
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"""
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_reactor = attr.ib()
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@defer.inlineCallbacks
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def sleep(self, seconds):
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d = defer.Deferred()
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with PreserveLoggingContext():
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self._reactor.callLater(seconds, d.callback, seconds)
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res = yield d
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defer.returnValue(res)
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def time(self):
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"""Returns the current system time in seconds since epoch."""
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return self._reactor.seconds()
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def time_msec(self):
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"""Returns the current system time in miliseconds since epoch."""
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return int(self.time() * 1000)
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def looping_call(self, f, msec):
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"""Call a function repeatedly.
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Waits `msec` initially before calling `f` for the first time.
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Args:
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f(function): The function to call repeatedly.
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msec(float): How long to wait between calls in milliseconds.
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"""
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call = task.LoopingCall(f)
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call.clock = self._reactor
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d = call.start(msec / 1000.0, now=False)
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d.addErrback(
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log_failure, "Looping call died", consumeErrors=False,
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)
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return call
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def call_later(self, delay, callback, *args, **kwargs):
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"""Call something later
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Args:
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delay(float): How long to wait in seconds.
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callback(function): Function to call
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*args: Postional arguments to pass to function.
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**kwargs: Key arguments to pass to function.
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"""
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def wrapped_callback(*args, **kwargs):
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with PreserveLoggingContext():
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callback(*args, **kwargs)
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with PreserveLoggingContext():
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return self._reactor.callLater(delay, wrapped_callback, *args, **kwargs)
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def cancel_call_later(self, timer, ignore_errs=False):
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try:
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timer.cancel()
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except Exception:
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if not ignore_errs:
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raise
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def batch_iter(iterable, size):
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"""batch an iterable up into tuples with a maximum size
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Args:
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iterable (iterable): the iterable to slice
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size (int): the maximum batch size
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Returns:
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an iterator over the chunks
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"""
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# make sure we can deal with iterables like lists too
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sourceiter = iter(iterable)
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# call islice until it returns an empty tuple
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return iter(lambda: tuple(islice(sourceiter, size)), ())
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def log_failure(failure, msg, consumeErrors=True):
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"""Creates a function suitable for passing to `Deferred.addErrback` that
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logs any failures that occur.
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Args:
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msg (str): Message to log
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consumeErrors (bool): If true consumes the failure, otherwise passes
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on down the callback chain
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Returns:
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func(Failure)
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"""
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logger.error(
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msg,
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exc_info=(
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failure.type,
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failure.value,
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failure.getTracebackObject()
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)
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)
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if not consumeErrors:
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return failure
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def glob_to_regex(glob):
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"""Converts a glob to a compiled regex object.
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The regex is anchored at the beginning and end of the string.
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Args:
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glob (str)
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Returns:
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re.RegexObject
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"""
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res = ''
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for c in glob:
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if c == '*':
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res = res + '.*'
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elif c == '?':
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res = res + '.'
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else:
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res = res + re.escape(c)
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# \A anchors at start of string, \Z at end of string
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return re.compile(r"\A" + res + r"\Z", re.IGNORECASE)
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