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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

55
synapse/handlers/receipts.py
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@ -135,37 +135,40 @@ class ReceiptsHandler(BaseHandler):
"""Given a list of receipts, works out which remote servers should be
poked and pokes them.
"""
# TODO: Some of this stuff should be coallesced.
for receipt in receipts:
room_id = receipt["room_id"]
receipt_type = receipt["receipt_type"]
user_id = receipt["user_id"]
event_ids = receipt["event_ids"]
data = receipt["data"]
try:
# TODO: Some of this stuff should be coallesced.
for receipt in receipts:
room_id = receipt["room_id"]
receipt_type = receipt["receipt_type"]
user_id = receipt["user_id"]
event_ids = receipt["event_ids"]
data = receipt["data"]
users = yield self.state.get_current_user_in_room(room_id)
remotedomains = set(get_domain_from_id(u) for u in users)
remotedomains = remotedomains.copy()
remotedomains.discard(self.server_name)
users = yield self.state.get_current_user_in_room(room_id)
remotedomains = set(get_domain_from_id(u) for u in users)
remotedomains = remotedomains.copy()
remotedomains.discard(self.server_name)
logger.debug("Sending receipt to: %r", remotedomains)
logger.debug("Sending receipt to: %r", remotedomains)
for domain in remotedomains:
self.federation.send_edu(
destination=domain,
edu_type="m.receipt",
content={
room_id: {
receipt_type: {
user_id: {
"event_ids": event_ids,
"data": data,
for domain in remotedomains:
self.federation.send_edu(
destination=domain,
edu_type="m.receipt",
content={
room_id: {
receipt_type: {
user_id: {
"event_ids": event_ids,
"data": data,
}
}
}
},
},
},
key=(room_id, receipt_type, user_id),
)
key=(room_id, receipt_type, user_id),
)
except Exception:
logger.exception("Error pushing receipts to remote servers")
@defer.inlineCallbacks
def get_receipts_for_room(self, room_id, to_key):