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Correctly handle timeout errors

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This commit is contained in:
Erik Johnston 2016-12-09 16:30:29 +00:00
parent be14c24cea
commit fbaf868f62
2 changed files with 20 additions and 7 deletions
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20
synapse/notifier.py
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@ -17,6 +17,7 @@ from twisted.internet import defer
from synapse.api.constants import EventTypes, Membership
from synapse.api.errors import AuthError
from synapse.util import DeferredTimedOutError
from synapse.util.logutils import log_function
from synapse.util.async import ObservableDeferred
from synapse.util.logcontext import PreserveLoggingContext, preserve_fn
@ -320,6 +321,8 @@ class Notifier(object):
listener.deferred,
time_out=(end_time - now) / 1000.
)
except DeferredTimedOutError:
break
except defer.CancelledError:
break
else:
@ -490,22 +493,27 @@ class Notifier(object):
"""
listener = _NotificationListener(None)
def timed_out():
listener.deferred.cancel()
end_time = self.clock.time_msec() + timeout
timer = self.clock.call_later(timeout / 1000., timed_out)
while True:
listener.deferred = self.replication_deferred.observe()
result = yield callback()
if result:
break
now = self.clock.time_msec()
if end_time <= now:
break
try:
with PreserveLoggingContext():
yield listener.deferred
yield self.clock.time_bound_deferred(
listener.deferred,
time_out=(end_time - now) / 1000.
)
except DeferredTimedOutError:
break
except defer.CancelledError:
break
self.clock.cancel_call_later(timer, ignore_errs=True)
defer.returnValue(result)

7
synapse/util/__init__.py
View file

@ -24,6 +24,11 @@ import logging
logger = logging.getLogger(__name__)
class DeferredTimedOutError(SynapseError):
def __init__(self):
super(SynapseError).__init__(504, "Timed out")
def unwrapFirstError(failure):
# defer.gatherResults and DeferredLists wrap failures.
failure.trap(defer.FirstError)
@ -89,7 +94,7 @@ class Clock(object):
def timed_out_fn():
try:
ret_deferred.errback(SynapseError(504, "Timed out"))
ret_deferred.errback(DeferredTimedOutError())
except:
pass