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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
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31
synapse/app/pusher.py
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@ -144,20 +144,23 @@ class PusherReplicationHandler(ReplicationClientHandler):
@defer.inlineCallbacks
def poke_pushers(self, stream_name, token, rows):
if stream_name == "pushers":
for row in rows:
if row.deleted:
yield self.stop_pusher(row.user_id, row.app_id, row.pushkey)
else:
yield self.start_pusher(row.user_id, row.app_id, row.pushkey)
elif stream_name == "events":
yield self.pusher_pool.on_new_notifications(
token, token,
)
elif stream_name == "receipts":
yield self.pusher_pool.on_new_receipts(
token, token, set(row.room_id for row in rows)
)
try:
if stream_name == "pushers":
for row in rows:
if row.deleted:
yield self.stop_pusher(row.user_id, row.app_id, row.pushkey)
else:
yield self.start_pusher(row.user_id, row.app_id, row.pushkey)
elif stream_name == "events":
yield self.pusher_pool.on_new_notifications(
token, token,
)
elif stream_name == "receipts":
yield self.pusher_pool.on_new_receipts(
token, token, set(row.room_id for row in rows)
)
except Exception:
logger.exception("Error poking pushers")
def stop_pusher(self, user_id, app_id, pushkey):
key = "%s:%s" % (app_id, pushkey)