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[Scheduler] Allow messages from the SchedulerTransport to be rejected #49964

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Merged
merged 1 commit into from
Apr 8, 2023
Merged

[Scheduler] Allow messages from the SchedulerTransport to be rejected #49964

merged 1 commit into from
Apr 8, 2023

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@tucksaun
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@tucksaun tucksaun commented Apr 6, 2023

Q A
Branch? 6.3
Bug fix? yes
New feature? no
Deprecations? no
Tickets Related to #49804
License MIT

Currently, when the processing of a scheduled message fails, Messenger will not be able to go on because the SchedulerTransport will throw an exception. More importantly, the original error will be swallowed by this one and not sent to the failure transport if one is configured. By allowing message rejection, Messenger will continue working as expected.

This is the first step to more changes regarding failure handling in ScheduledMessage processing.

/cc @fabpot @kbond

@tucksaun
[Scheduler] Allow messages from the SchedulerTransport to be rejected
7c5c121 
Currently, when the processing of a scheduled message fails, Messenger will not be able to go on because the SchedulerTransport will throw an exception. More importantly, the original error will be swallowed by this one and not sent to the failure transport if one is configured. By allowing message rejection, Messenger will continue working as expected.

This is the first step to more changes regarding failure handling in ScheduledMessage processing.
@carsonbot carsonbot added this to the 6.3 milestone Apr 6, 2023
@kbond
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kbond commented Apr 6, 2023

To clarify the on failure scenarios:

  1. no failure_transport configured: swallows the error and appropriate events are dispatched
  2. failure_transport configured: swallows the error, appropriate events are dispatched and sent to the failure transport (no retries)
  3. retry_strategy configured for your scheduler transport: ignored

kbond
kbond approved these changes Apr 6, 2023
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Perfect! I think we can mark this as a fix for #49804. Additional features could be added but it's no longer a bug.

@tucksaun
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tucksaun commented Apr 6, 2023

Actually:
3. retry_strategy configured for your scheduler transport: a "cannot send messages" exception is thrown

@kbond
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kbond commented Apr 6, 2023

Actually:
3. retry_strategy configured for your scheduler transport: a "cannot send messages" exception is thrown

That's better I think (doesn't give you the impression that they're being retried).

@tucksaun tucksaun mentioned this pull request Apr 6, 2023
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@fabpot
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fabpot commented Apr 7, 2023

As the Scheduler component is all about recurring messages, I think they should never be retried.

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fabpot commented Apr 7, 2023

If you want the message to be retried, you should use the RedispatchMessage feature to send the message to another transport that can be retried.

@kbond
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kbond commented Apr 7, 2023

As the Scheduler component is all about recurring messages, I think they should never be retried.

I'm fine with this stance for #49965 but this PR is required imo.

@tucksaun
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tucksaun commented Apr 7, 2023

I agree (and therefore closed #49965).
But this PR is required if we don't want workers to crash when the handling of a recurring message fails (because Messenger Worker will call reject when a failure happens leading to an unhandled exception)

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fabpot commented Apr 8, 2023

Thank you @tucksaun.

@fabpot fabpot merged commit aaff87a into symfony:6.3 Apr 8, 2023
@tucksaun tucksaun deleted the scheduler/allow-rejection branch April 8, 2023 15:13
@tucksaun tucksaun mentioned this pull request Apr 8, 2023
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