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Improve exception handling for background processes

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There were a bunch of places where we fire off a process to happen in the
background, but don't have any exception handling on it - instead relying on
the unhandled error being logged when the relevent deferred gets
garbage-collected.

This is unsatisfactory for a number of reasons:
 - logging on garbage collection is best-effort and may happen some time after
   the error, if at all
 - it can be hard to figure out where the error actually happened.
 - it is logged as a scary CRITICAL error which (a) I always forget to grep for
   and (b) it's not really CRITICAL if a background process we don't care about
   fails.

So this is an attempt to add exception handling to everything we fire off into
the background.
This commit is contained in:
Richard van der Hoff 2018-04-27 11:07:40 +01:00
parent 0ced8b5b47
commit 9255a6cb17
20 changed files with 331 additions and 233 deletions
Download patch file Download diff file Expand all files Collapse all files

43
synapse/handlers/typing.py
View file

@ -205,28 +205,31 @@ class TypingHandler(object):
@defer.inlineCallbacks
def _push_remote(self, member, typing):
users = yield self.state.get_current_user_in_room(member.room_id)
self._member_last_federation_poke[member] = self.clock.time_msec()
try:
users = yield self.state.get_current_user_in_room(member.room_id)
self._member_last_federation_poke[member] = self.clock.time_msec()
now = self.clock.time_msec()
self.wheel_timer.insert(
now=now,
obj=member,
then=now + FEDERATION_PING_INTERVAL,
)
now = self.clock.time_msec()
self.wheel_timer.insert(
now=now,
obj=member,
then=now + FEDERATION_PING_INTERVAL,
)
for domain in set(get_domain_from_id(u) for u in users):
if domain != self.server_name:
self.federation.send_edu(
destination=domain,
edu_type="m.typing",
content={
"room_id": member.room_id,
"user_id": member.user_id,
"typing": typing,
},
key=member,
)
for domain in set(get_domain_from_id(u) for u in users):
if domain != self.server_name:
self.federation.send_edu(
destination=domain,
edu_type="m.typing",
content={
"room_id": member.room_id,
"user_id": member.user_id,
"typing": typing,
},
key=member,
)
except Exception:
logger.exception("Error pushing typing notif to remotes")
@defer.inlineCallbacks
def _recv_edu(self, origin, content):