138 lines
3.7 KiB
Python
138 lines
3.7 KiB
Python
# -*- coding: utf-8 -*-
|
|
# Copyright 2014-2016 OpenMarket Ltd
|
|
#
|
|
# 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
|
|
from synapse.util.logcontext import PreserveLoggingContext
|
|
|
|
from twisted.internet import defer, reactor, task
|
|
|
|
import time
|
|
import logging
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
class DeferredTimedOutError(SynapseError):
|
|
def __init__(self):
|
|
super(SynapseError, self).__init__(504, "Timed out")
|
|
|
|
|
|
def unwrapFirstError(failure):
|
|
# defer.gatherResults and DeferredLists wrap failures.
|
|
failure.trap(defer.FirstError)
|
|
return failure.value.subFailure
|
|
|
|
|
|
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
|
|
"""
|
|
|
|
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."""
|
|
return int(self.time() * 1000)
|
|
|
|
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.
|
|
"""
|
|
l = task.LoopingCall(f)
|
|
l.start(msec / 1000.0, now=False)
|
|
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):
|
|
with PreserveLoggingContext():
|
|
callback(*args, **kwargs)
|
|
|
|
with PreserveLoggingContext():
|
|
return reactor.callLater(delay, wrapped_callback, *args, **kwargs)
|
|
|
|
def cancel_call_later(self, timer, ignore_errs=False):
|
|
try:
|
|
timer.cancel()
|
|
except:
|
|
if not ignore_errs:
|
|
raise
|
|
|
|
def time_bound_deferred(self, given_deferred, time_out):
|
|
if given_deferred.called:
|
|
return given_deferred
|
|
|
|
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
|
|
|
|
given_deferred.addCallbacks(callback=success, errback=err)
|
|
|
|
timer = self.call_later(time_out, timed_out_fn)
|
|
|
|
return ret_deferred
|