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Merge pull request #3127 from matrix-org/rav/deferred_timeout 

Use deferred.addTimeout instead of time_bound_deferred
This commit is contained in:
Richard van der Hoff 2018-04-27 14:32:54 +01:00 committed by GitHub
parent d2737c1fae 6146332387
commit 9558236728
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GPG Key ID: 4AEE18F83AFDEB23
7 changed files with 137 additions and 132 deletions
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22
synapse/http/__init__.py
View File

@ -1,5 +1,6 @@
# -*- coding: utf-8 -*-
# Copyright 2014-2016 OpenMarket Ltd
# Copyright 2018 New Vector Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
@ -12,3 +13,24 @@
# 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 twisted.internet.defer import CancelledError
from twisted.python import failure
from synapse.api.errors import SynapseError
class RequestTimedOutError(SynapseError):
"""Exception representing timeout of an outbound request"""
def __init__(self):
super(RequestTimedOutError, self).__init__(504, "Timed out")
def cancelled_to_request_timed_out_error(value):
"""Turns CancelledErrors into RequestTimedOutErrors.
For use with async.add_timeout_to_deferred
"""
if isinstance(value, failure.Failure):
value.trap(CancelledError)
raise RequestTimedOutError()
return value

24
synapse/http/client.py
View File

@ -1,5 +1,6 @@
# -*- coding: utf-8 -*-
# Copyright 2014-2016 OpenMarket Ltd
# Copyright 2018 New Vector Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
@ -18,9 +19,10 @@ from OpenSSL.SSL import VERIFY_NONE
from synapse.api.errors import (
CodeMessageException, MatrixCodeMessageException, SynapseError, Codes,
)
from synapse.http import cancelled_to_request_timed_out_error
from synapse.util.async import add_timeout_to_deferred
from synapse.util.caches import CACHE_SIZE_FACTOR
from synapse.util.logcontext import make_deferred_yieldable
from synapse.util import logcontext
import synapse.metrics
from synapse.http.endpoint import SpiderEndpoint
@ -95,21 +97,17 @@ class SimpleHttpClient(object):
# counters to it
outgoing_requests_counter.inc(method)
def send_request():
request_deferred = self.agent.request(
method, uri, *args, **kwargs
)
return self.clock.time_bound_deferred(
request_deferred,
time_out=60,
)
logger.info("Sending request %s %s", method, uri)
try:
with logcontext.PreserveLoggingContext():
response = yield send_request()
request_deferred = self.agent.request(
method, uri, *args, **kwargs
)
add_timeout_to_deferred(
request_deferred,
60, cancelled_to_request_timed_out_error,
)
response = yield make_deferred_yieldable(request_deferred)
incoming_responses_counter.inc(method, response.code)
logger.info(

22
synapse/http/matrixfederationclient.py
View File

@ -1,5 +1,6 @@
# -*- coding: utf-8 -*-
# Copyright 2014-2016 OpenMarket Ltd
# Copyright 2018 New Vector Ltd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
@ -12,17 +13,19 @@
# 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 synapse.util.retryutils
from twisted.internet import defer, reactor, protocol
from twisted.internet.error import DNSLookupError
from twisted.web.client import readBody, HTTPConnectionPool, Agent
from twisted.web.http_headers import Headers
from twisted.web._newclient import ResponseDone
from synapse.http import cancelled_to_request_timed_out_error
from synapse.http.endpoint import matrix_federation_endpoint
from synapse.util.async import sleep
from synapse.util import logcontext
import synapse.metrics
from synapse.util.async import sleep, add_timeout_to_deferred
from synapse.util import logcontext
from synapse.util.logcontext import make_deferred_yieldable
import synapse.util.retryutils
from canonicaljson import encode_canonical_json
@ -184,21 +187,20 @@ class MatrixFederationHttpClient(object):
producer = body_callback(method, http_url_bytes, headers_dict)
try:
def send_request():
request_deferred = self.agent.request(
method,
url_bytes,
Headers(headers_dict),
producer
)
return self.clock.time_bound_deferred(
add_timeout_to_deferred(
request_deferred,
timeout / 1000. if timeout else 60,
cancelled_to_request_timed_out_error,
)
response = yield make_deferred_yieldable(
request_deferred,
time_out=timeout / 1000. if timeout else 60,
)
with logcontext.PreserveLoggingContext():
response = yield send_request()
log_result = "%d %s" % (response.code, response.phrase,)
break

27
synapse/notifier.py
View File

@ -14,13 +14,16 @@
# limitations under the License.
from twisted.internet import defer
from synapse.api.constants import EventTypes, Membership
from synapse.api.errors import AuthError
from synapse.handlers.presence import format_user_presence_state
from synapse.util import DeferredTimedOutError
from synapse.util.logutils import log_function
from synapse.util.async import ObservableDeferred
from synapse.util.async import (
ObservableDeferred, add_timeout_to_deferred,
DeferredTimeoutError,
)
from synapse.util.logcontext import PreserveLoggingContext, run_in_background
from synapse.util.metrics import Measure
from synapse.types import StreamToken
@ -336,11 +339,12 @@ class Notifier(object):
# Now we wait for the _NotifierUserStream to be told there
# is a new token.
listener = user_stream.new_listener(prev_token)
with PreserveLoggingContext():
yield self.clock.time_bound_deferred(
add_timeout_to_deferred(
listener.deferred,
time_out=(end_time - now) / 1000.
(end_time - now) / 1000.,
)
with PreserveLoggingContext():
yield listener.deferred
current_token = user_stream.current_token
@ -351,7 +355,7 @@ class Notifier(object):
# Update the prev_token to the current_token since nothing
# has happened between the old prev_token and the current_token
prev_token = current_token
except DeferredTimedOutError:
except DeferredTimeoutError:
break
except defer.CancelledError:
break
@ -556,13 +560,14 @@ class Notifier(object):
if end_time <= now:
break
add_timeout_to_deferred(
listener.deferred.addTimeout,
(end_time - now) / 1000.,
)
try:
with PreserveLoggingContext():
yield self.clock.time_bound_deferred(
listener.deferred,
time_out=(end_time - now) / 1000.
)
except DeferredTimedOutError:
yield listener.deferred
except DeferredTimeoutError:
break
except defer.CancelledError:
break

56
synapse/util/__init__.py
View File

@ -13,7 +13,6 @@
# 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
@ -24,11 +23,6 @@ import logging
logger = logging.getLogger(__name__)
class DeferredTimedOutError(SynapseError):
def __init__(self):
super(DeferredTimedOutError, self).__init__(504, "Timed out")
def unwrapFirstError(failure):
# defer.gatherResults and DeferredLists wrap failures.
failure.trap(defer.FirstError)
@ -85,53 +79,3 @@ class Clock(object):
except Exception:
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 Exception:
pass
try:
given_deferred.cancel()
except Exception:
pass
timer = None
def cancel(res):
try:
self.cancel_call_later(timer)
except Exception:
pass
return res
ret_deferred.addBoth(cancel)
def success(res):
try:
ret_deferred.callback(res)
except Exception:
pass
return res
def err(res):
try:
ret_deferred.errback(res)
except Exception:
pass
given_deferred.addCallbacks(callback=success, errback=err)
timer = self.call_later(time_out, timed_out_fn)
return ret_deferred

67
synapse/util/async.py
View File

@ -15,6 +15,8 @@
from twisted.internet import defer, reactor
from twisted.internet.defer import CancelledError
from twisted.python import failure
from .logcontext import (
PreserveLoggingContext, make_deferred_yieldable, preserve_fn
@ -392,3 +394,68 @@ class ReadWriteLock(object):
self.key_to_current_writer.pop(key)
defer.returnValue(_ctx_manager())
class DeferredTimeoutError(Exception):
"""
This error is raised by default when a L{Deferred} times out.
"""
def add_timeout_to_deferred(deferred, timeout, on_timeout_cancel=None):
"""
Add a timeout to a deferred by scheduling it to be cancelled after
timeout seconds.
This is essentially a backport of deferred.addTimeout, which was introduced
in twisted 16.5.
If the deferred gets timed out, it errbacks with a DeferredTimeoutError,
unless a cancelable function was passed to its initialization or unless
a different on_timeout_cancel callable is provided.
Args:
deferred (defer.Deferred): deferred to be timed out
timeout (Number): seconds to time out after
on_timeout_cancel (callable): A callable which is called immediately
after the deferred times out, and not if this deferred is
otherwise cancelled before the timeout.
It takes an arbitrary value, which is the value of the deferred at
that exact point in time (probably a CancelledError Failure), and
the timeout.
The default callable (if none is provided) will translate a
CancelledError Failure into a DeferredTimeoutError.
"""
timed_out = [False]
def time_it_out():
timed_out[0] = True
deferred.cancel()
delayed_call = reactor.callLater(timeout, time_it_out)
def convert_cancelled(value):
if timed_out[0]:
to_call = on_timeout_cancel or _cancelled_to_timed_out_error
return to_call(value, timeout)
return value
deferred.addBoth(convert_cancelled)
def cancel_timeout(result):
# stop the pending call to cancel the deferred if it's been fired
if delayed_call.active():
delayed_call.cancel()
return result
deferred.addBoth(cancel_timeout)
def _cancelled_to_timed_out_error(value, timeout):
if isinstance(value, failure.Failure):
value.trap(CancelledError)
raise DeferredTimeoutError(timeout, "Deferred")
return value

33
tests/util/test_clock.py
View File

@ -1,33 +0,0 @@
# -*- coding: utf-8 -*-
# Copyright 2017 Vector Creations 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 import util
from twisted.internet import defer
from tests import unittest
class ClockTestCase(unittest.TestCase):
@defer.inlineCallbacks
def test_time_bound_deferred(self):
# just a deferred which never resolves
slow_deferred = defer.Deferred()
clock = util.Clock()
time_bound = clock.time_bound_deferred(slow_deferred, 0.001)
try:
yield time_bound
self.fail("Expected timedout error, but got nothing")
except util.DeferredTimedOutError:
pass