synapse-old/synapse/util/__init__.py

138 lines
3.7 KiB
Python
Raw Normal View History

2014-08-12 08:10:52 -06:00
# -*- coding: utf-8 -*-
2016-01-06 21:26:29 -07:00
# Copyright 2014-2016 OpenMarket Ltd
2014-08-12 08:10:52 -06:00
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from synapse.api.errors import SynapseError
2016-02-04 03:22:44 -07:00
from synapse.util.logcontext import PreserveLoggingContext
from twisted.internet import defer, reactor, task
2014-08-12 08:10:52 -06:00
import time
import logging
logger = logging.getLogger(__name__)
2014-08-12 08:10:52 -06:00
2016-12-09 09:30:29 -07:00
class DeferredTimedOutError(SynapseError):
def __init__(self):
super(DeferredTimedOutError, self).__init__(504, "Timed out")
2016-12-09 09:30:29 -07:00
2015-05-12 06:14:29 -06:00
def unwrapFirstError(failure):
# defer.gatherResults and DeferredLists wrap failures.
failure.trap(defer.FirstError)
return failure.value.subFailure
2014-08-12 08:10:52 -06:00
class Clock(object):
"""A small utility that obtains current time-of-day so that time may be
mocked during unit-tests.
TODO(paul): Also move the sleep() functionality into it
2014-08-12 08:10:52 -06:00
"""
def time(self):
"""Returns the current system time in seconds since epoch."""
return time.time()
def time_msec(self):
"""Returns the current system time in miliseconds since epoch."""
2016-02-15 10:10:40 -07:00
return int(self.time() * 1000)
2014-08-12 08:10:52 -06:00
2015-02-09 07:47:59 -07:00
def looping_call(self, f, msec):
"""Call a function repeatedly.
Waits `msec` initially before calling `f` for the first time.
Args:
f(function): The function to call repeatedly.
msec(float): How long to wait between calls in milliseconds.
"""
2015-02-09 07:47:59 -07:00
l = task.LoopingCall(f)
2016-02-02 10:18:50 -07:00
l.start(msec / 1000.0, now=False)
2015-02-09 07:47:59 -07:00
return l
def call_later(self, delay, callback, *args, **kwargs):
"""Call something later
Args:
delay(float): How long to wait in seconds.
callback(function): Function to call
*args: Postional arguments to pass to function.
**kwargs: Key arguments to pass to function.
"""
def wrapped_callback(*args, **kwargs):
2016-02-04 03:22:44 -07:00
with PreserveLoggingContext():
callback(*args, **kwargs)
2015-05-08 12:53:34 -06:00
with PreserveLoggingContext():
return reactor.callLater(delay, wrapped_callback, *args, **kwargs)
2014-08-12 08:10:52 -06:00
def cancel_call_later(self, timer, ignore_errs=False):
try:
timer.cancel()
except:
if not ignore_errs:
raise
2015-02-11 03:25:06 -07:00
def time_bound_deferred(self, given_deferred, time_out):
if given_deferred.called:
return given_deferred
2015-02-11 03:25:06 -07:00
ret_deferred = defer.Deferred()
def timed_out_fn():
e = DeferredTimedOutError()
try:
ret_deferred.errback(e)
except:
pass
try:
given_deferred.cancel()
except:
pass
timer = None
def cancel(res):
try:
self.cancel_call_later(timer)
except:
pass
return res
ret_deferred.addBoth(cancel)
def success(res):
try:
ret_deferred.callback(res)
except:
pass
return res
def err(res):
try:
ret_deferred.errback(res)
except:
pass
2015-02-11 03:25:06 -07:00
given_deferred.addCallbacks(callback=success, errback=err)
2015-02-11 03:25:06 -07:00
timer = self.call_later(time_out, timed_out_fn)
2015-02-11 03:25:06 -07:00
return ret_deferred