add middleware::logger::custom_response_replace

[benny-n]

PR Type

Feature

PR Checklist

• Tests for the changes have been added / updated.
• Documentation comments have been added / updated.
• A changelog entry has been made for the appropriate packages.
• Format code with the latest stable rustfmt.
• (Team) Label with affected crates and semver status.

Overview

It is now possible to pass a closure to the logger, which recevies a StatusCode ServiceResponse and returns a String for use in the log line

Closes #2627

[robjtede]

I figured out a way to execute the original plan of custom response-based replacements.

@benny-n let me know what you think of the solution.

[benny-n]

Hi @robjtede,
This is really great!
With these changes we can access a ServiceResponse in the custom function which is what I wanted in the original plan.
So if I understood correctly, the solution was to reconstruct the response into a temporary ServiceResponse without the actual body?

[robjtede]

@benny-n Yeah, you got it. It works out okay because response bodies are not accessible with only shared refs so it doesn't matter what is in the body slot for our closure here. This way keeps the API free of generics.