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Avoid incorrect call to the previous reply's callback #1040

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merged 2 commits into from
Jan 28, 2022

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bjosv
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@bjosv bjosv commented Jan 21, 2022

When multiple replies are parsed from a socket in one read;
a previously found callback might get reused when the current reply has no known callback.

This case is triggered in the added testcase test_pubsub_multiple_channels(),
which unsubscribes to the subscribed channels A, B and a non-subscribed channel X.
Without this correction a callback for wrong channel is called.

  • For the command unsubscribe B X A, B's callback is called when handling the response for X.
  • Now this is not done, i.e. there is no callback called for X.

Monitoring was using this trait to repush its callback when all replies was parsed.
This is changed to repush for each message instead, which now also is tested with a new testcase.

bjosv added 2 commits January 21, 2022 01:11
When multiple replies are parsed from a socket in one read
a previously found callback might get reused when the current
reply has no known callback.

This can be triggered by the added testcase which unsubscribe to
subscribed (A,B) and a non-subscribed channel (X).
Without this correction a callback for wrong channel is called.
-  In 'unsubscribe B X A', B's callback is called when handling X.
-  Now this is not done, i.e. there is no callback called for X.
MONITORING used the same callback for all replies while parsing
multiple responses. This handling was changed to avoid calling
the wrong callback in some scenarios.
Now also change monitorings repush to work with this change.

Includes an added async monitoring testcase.
@bjosv bjosv force-pushed the avoid-callback-reuse branch from e56b410 to 5f29d39 Compare January 21, 2022 00:44
@michael-grunder michael-grunder merged commit be41ed6 into redis:master Jan 28, 2022
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Merged, thanks!

@bjosv bjosv deleted the avoid-callback-reuse branch January 28, 2022 08:13
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2 participants