169 lines
4.9 KiB
Python
169 lines
4.9 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.
|
|
|
|
import logging
|
|
import re
|
|
from itertools import islice
|
|
|
|
import attr
|
|
|
|
from twisted.internet import defer, task
|
|
|
|
from synapse.logging import context
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
def unwrapFirstError(failure):
|
|
# defer.gatherResults and DeferredLists wrap failures.
|
|
failure.trap(defer.FirstError)
|
|
return failure.value.subFailure
|
|
|
|
|
|
@attr.s
|
|
class Clock(object):
|
|
"""
|
|
A Clock wraps a Twisted reactor and provides utilities on top of it.
|
|
|
|
Args:
|
|
reactor: The Twisted reactor to use.
|
|
"""
|
|
|
|
_reactor = attr.ib()
|
|
|
|
@defer.inlineCallbacks
|
|
def sleep(self, seconds):
|
|
d = defer.Deferred()
|
|
with context.PreserveLoggingContext():
|
|
self._reactor.callLater(seconds, d.callback, seconds)
|
|
res = yield d
|
|
return res
|
|
|
|
def time(self):
|
|
"""Returns the current system time in seconds since epoch."""
|
|
return self._reactor.seconds()
|
|
|
|
def time_msec(self):
|
|
"""Returns the current system time in miliseconds since epoch."""
|
|
return int(self.time() * 1000)
|
|
|
|
def looping_call(self, f, msec, *args, **kwargs):
|
|
"""Call a function repeatedly.
|
|
|
|
Waits `msec` initially before calling `f` for the first time.
|
|
|
|
Note that the function will be called with no logcontext, so if it is anything
|
|
other than trivial, you probably want to wrap it in run_as_background_process.
|
|
|
|
Args:
|
|
f(function): The function to call repeatedly.
|
|
msec(float): How long to wait between calls in milliseconds.
|
|
*args: Postional arguments to pass to function.
|
|
**kwargs: Key arguments to pass to function.
|
|
"""
|
|
call = task.LoopingCall(f, *args, **kwargs)
|
|
call.clock = self._reactor
|
|
d = call.start(msec / 1000.0, now=False)
|
|
d.addErrback(log_failure, "Looping call died", consumeErrors=False)
|
|
return call
|
|
|
|
def call_later(self, delay, callback, *args, **kwargs):
|
|
"""Call something later
|
|
|
|
Note that the function will be called with no logcontext, so if it is anything
|
|
other than trivial, you probably want to wrap it in run_as_background_process.
|
|
|
|
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 context.PreserveLoggingContext():
|
|
callback(*args, **kwargs)
|
|
|
|
with context.PreserveLoggingContext():
|
|
return self._reactor.callLater(delay, wrapped_callback, *args, **kwargs)
|
|
|
|
def cancel_call_later(self, timer, ignore_errs=False):
|
|
try:
|
|
timer.cancel()
|
|
except Exception:
|
|
if not ignore_errs:
|
|
raise
|
|
|
|
|
|
def batch_iter(iterable, size):
|
|
"""batch an iterable up into tuples with a maximum size
|
|
|
|
Args:
|
|
iterable (iterable): the iterable to slice
|
|
size (int): the maximum batch size
|
|
|
|
Returns:
|
|
an iterator over the chunks
|
|
"""
|
|
# make sure we can deal with iterables like lists too
|
|
sourceiter = iter(iterable)
|
|
# call islice until it returns an empty tuple
|
|
return iter(lambda: tuple(islice(sourceiter, size)), ())
|
|
|
|
|
|
def log_failure(failure, msg, consumeErrors=True):
|
|
"""Creates a function suitable for passing to `Deferred.addErrback` that
|
|
logs any failures that occur.
|
|
|
|
Args:
|
|
msg (str): Message to log
|
|
consumeErrors (bool): If true consumes the failure, otherwise passes
|
|
on down the callback chain
|
|
|
|
Returns:
|
|
func(Failure)
|
|
"""
|
|
|
|
logger.error(
|
|
msg, exc_info=(failure.type, failure.value, failure.getTracebackObject())
|
|
)
|
|
|
|
if not consumeErrors:
|
|
return failure
|
|
|
|
|
|
def glob_to_regex(glob):
|
|
"""Converts a glob to a compiled regex object.
|
|
|
|
The regex is anchored at the beginning and end of the string.
|
|
|
|
Args:
|
|
glob (str)
|
|
|
|
Returns:
|
|
re.RegexObject
|
|
"""
|
|
res = ""
|
|
for c in glob:
|
|
if c == "*":
|
|
res = res + ".*"
|
|
elif c == "?":
|
|
res = res + "."
|
|
else:
|
|
res = res + re.escape(c)
|
|
|
|
# \A anchors at start of string, \Z at end of string
|
|
return re.compile(r"\A" + res + r"\Z", re.IGNORECASE)
|