EffectPublisher.operation is private

[ivanmoskalev]

Description

Good afternoon! Not exactly a bug.

I'm trying to implement a reducer that would work akin to the _SignpostReducer — but logging the trace to something like Sentry or Firebase Performance.

For this I need access to EffectPublisher.operation, which is declared as internal.

It would be possible to implement the tracing reducer either:

1. By opening up access to the variable.
2. By generalizing the _SignpostReducer so that it can be constructed with closures that would get called [before and/or] after the effects get executed.

Checklist

• I have determined whether this bug is also reproducible in a vanilla SwiftUI project.
• If possible, I've reproduced the issue using the main branch of this package.
• This issue hasn't been addressed in an existing GitHub issue or discussion.

Expected behavior

No response

Actual behavior

No response

Steps to reproduce

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The Composable Architecture version information

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Destination operating system

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Xcode version information

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Swift Compiler version information

No response

[mbrandonw]

Hi @ivanmoskalev, while you can't provide the exact implementation that the effectSignpost method does, you can still accomplish what you want since Effect still does conform to the Publisher protocol. You can use the handleEvents method from Combine to instrument all of the events of the effect, like done here.

I'm going to convert this to a discussion since it isn't really an issue with the library, but feel free to ask any follow up questions.