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coder/coderd/database/pubsub
Spike Curtis 51707446d0 fix: stop holding Pubsub mutex while calling pq.Listener (#12518)
fixes #11950

https://github.com/coder/coder/issues/11950#issuecomment-1987756088 explains the bug

We were also calling into `Unlisten()` and `Close()` while holding the mutex.  I don't believe that `Close()` depends on the notification loop being unblocked, but it's hard to be sure, and the safest thing to do is assume it could block.

So, I added a unit test that fakes out `pq.Listener` and sends a bunch of notifies every time we call into it to hopefully prevent regression where we hold the mutex while calling into these functions.

It also removes the use of a `context.Context` to stop the PubSub -- it must be explicitly `Closed()`.  This simplifies a bunch of the logic, and is how we use the pubsub anyway.
2024-03-12 09:44:12 +04:00
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