add replacement for current thread name in Logger

[Atri10]

PR Type: [Supoort]

This PR provides support to log the name of current thread which is handling the request.

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

Current behaviour with default Format shown below

r#"%a "%r" %s %b "%{Referer}i" "%{User-Agent}i" %T"#

We get Log:

[2024-04-11T17:29:13.432712900Z INFO  actix_web::middleware::logger] 127.0.0.1 "GET /spells HTTP/1.1" 200 285229 "-" "PostmanRuntime/7.37.3" 0.020495

New Behaviour (With custom Format shown below)

wrap(Logger::new(r#"[%P] [%a] ["%r"] [Response = %s] [Size = %b] "%{Referer}i" "%{User-Agent}i" Processed in %Tms."#))

We get Log:

[2024-04-11T17:31:15.122169300Z INFO  actix_web::middleware::logger] [actix-rt|system:0|arbiter:0] [127.0.0.1] ["GET /spells HTTP/1.1"] [Response = 200] [Size = 285229] "-" "PostmanRuntime/7.37.3" Processed in 0.020377ms.

[robjtede]

I don't think I want this to be a standard option, it shouldn't usually matter which thread is handling the requests.

The behavior you're after can be achieved easily with a custom request replacement:

Logger::new("%{thread}xi")
  .custom_request_replace("thread", |_| std::thread::current().name().unwrap().to_owned())