From 9255a6cb17716c022ebae1dbe9c142b78ca86ea7 Mon Sep 17 00:00:00 2001 From: Richard van der Hoff Date: Fri, 27 Apr 2018 11:07:40 +0100 Subject: Improve exception handling for background processes 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. --- synapse/groups/attestations.py | 44 +++++++++++++++++++++++------------------- 1 file changed, 24 insertions(+), 20 deletions(-) (limited to 'synapse/groups') diff --git a/synapse/groups/attestations.py b/synapse/groups/attestations.py index 1fb709e6c3..7187df2508 100644 --- a/synapse/groups/attestations.py +++ b/synapse/groups/attestations.py @@ -165,28 +165,32 @@ class GroupAttestionRenewer(object): @defer.inlineCallbacks def _renew_attestation(group_id, user_id): - if not self.is_mine_id(group_id): - destination = get_domain_from_id(group_id) - elif not self.is_mine_id(user_id): - destination = get_domain_from_id(user_id) - else: - logger.warn( - "Incorrectly trying to do attestations for user: %r in %r", - user_id, group_id, + try: + if not self.is_mine_id(group_id): + destination = get_domain_from_id(group_id) + elif not self.is_mine_id(user_id): + destination = get_domain_from_id(user_id) + else: + logger.warn( + "Incorrectly trying to do attestations for user: %r in %r", + user_id, group_id, + ) + yield self.store.remove_attestation_renewal(group_id, user_id) + return + + attestation = self.attestations.create_attestation(group_id, user_id) + + yield self.transport_client.renew_group_attestation( + destination, group_id, user_id, + content={"attestation": attestation}, ) - yield self.store.remove_attestation_renewal(group_id, user_id) - return - - attestation = self.attestations.create_attestation(group_id, user_id) - yield self.transport_client.renew_group_attestation( - destination, group_id, user_id, - content={"attestation": attestation}, - ) - - yield self.store.update_attestation_renewal( - group_id, user_id, attestation - ) + yield self.store.update_attestation_renewal( + group_id, user_id, attestation + ) + except Exception: + logger.exception("Error renewing attestation of %r in %r", + user_id, group_id) for row in rows: group_id = row["group_id"] -- cgit 1.4.1