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Remove $Changed from logical flow of emitter #1394

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lauckhart
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Previously we were providing the ActionContext of the emitter to $Changed handlers. The transaction was destroyed in this case so was not really useful. Now we instead just provide metadata about the subject that triggered the change.

Also, the emitter was awaiting $Changed handlers if they were async. There are advantages and disadvantages to doing this:

  • Advantage is that the logical flow is more deterministic and we track the promise as a normal part of node activity
  • The disadvantage is that the emitter blocks until an independent process completes

This commit makes it so $Changed handlers operate independently of the emitter. Tests pass but effects will be subtle so will need to keep an eye on this.

@Apollon77
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see review comments in Discord - also reason for the failed testcase

@lauckhart lauckhart force-pushed the changed-reactor-tx-fix branch from f92f587 to 74ff494 Compare November 24, 2024 22:04
Previously we were providing the ActionContext of the emitter to $Changed handlers.  The transaction was destroyed in this case so was not really useful.  Now we instead just provide metadata about the subject that triggered the change.

Also, the emitter was awaiting $Changed handlers if they were async.  There are advantages and disadvantages to doing this:

* Advantage is that the logical flow is more deterministic and we track the promise as a normal part of node activity
* The disadvantage is that the emitter blocks until an independent process completes

This commit makes it so $Changed handlers operate independently of the emitter.  Tests pass but effects will be subtle so will need to keep an eye on this.
...when computing ACL changes
...to make cert tests happy
@lauckhart lauckhart force-pushed the changed-reactor-tx-fix branch from ddf6584 to d822be8 Compare November 24, 2024 22:22
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2 participants