🐛Redis locks disappearing and fixup weird usage #7020
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Codecov ReportAttention: Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## master #7020 +/- ##
==========================================
- Coverage 86.94% 86.31% -0.63%
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Files 1651 1615 -36
Lines 64811 63147 -1664
Branches 2041 2043 +2
==========================================
- Hits 56351 54507 -1844
- Misses 8122 8305 +183
+ Partials 338 335 -3
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packages/service-library/src/servicelib/background_task_utils.py
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What do these changes do?
In short
lock_contextis goneexclusivedecorator shall be used insteadexclusive_periodicdecorator is now the solution when one wants a background task that runs exclusively on one replica of a service, with automatic recovery in case the replica is stopped/crashed.Details
lock_contextcontext manager is gone as it has an inherent flaw if the lock disappears from the Redis database for whatever reason it will not raiseexclusivedecorator was re-written without usinglock_contextand is now the de-factor way of protecting functions with a distributed lock. This is the way nowasyncio.Taskasyncio.Tasks! Thus proving difficult to cancel them.background_task.pymodule that now also provides a decoratorperiodicwhich wraps tenacity ownretrydecorator with some standard parametersasync_delayeddecorator towith_delayintoasync_utils.pylock_contextcontext manager withexclusivedecorator repo-wideexclusive_periodicdecoratorRelated issue/s
How to test
Dev-ops checklist