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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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15
synapse/app/appservice.py
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@ -32,10 +32,10 @@ from synapse.replication.tcp.client import ReplicationClientHandler
from synapse.server import HomeServer
from synapse.storage.engines import create_engine
from synapse.util.httpresourcetree import create_resource_tree
from synapse.util.logcontext import LoggingContext, preserve_fn
from synapse.util.logcontext import LoggingContext, run_in_background
from synapse.util.manhole import manhole
from synapse.util.versionstring import get_version_string
from twisted.internet import reactor
from twisted.internet import reactor, defer
from twisted.web.resource import NoResource
logger = logging.getLogger("synapse.app.appservice")
@ -112,9 +112,14 @@ class ASReplicationHandler(ReplicationClientHandler):
if stream_name == "events":
max_stream_id = self.store.get_room_max_stream_ordering()
preserve_fn(
self.appservice_handler.notify_interested_services
)(max_stream_id)
run_in_background(self._notify_app_services, max_stream_id)
@defer.inlineCallbacks
def _notify_app_services(self, room_stream_id):
try:
yield self.appservice_handler.notify_interested_services(room_stream_id)
except Exception:
logger.exception("Error notifying application services of event")
def start(config_options):