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authorRichard van der Hoff <richard@matrix.org>2018-04-27 11:07:40 +0100
committerRichard van der Hoff <richard@matrix.org>2018-04-27 11:07:40 +0100
commit9255a6cb17716c022ebae1dbe9c142b78ca86ea7 (patch)
tree185b1b00af216695daca391eb62a871e78d32e49 /tests/metrics
parentMerge pull request #3134 from matrix-org/erikj/fix_admin_media_api (diff)
downloadsynapse-9255a6cb17716c022ebae1dbe9c142b78ca86ea7.tar.xz
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.
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