[ruby-core:113751] [Ruby master Feature#19056] Introduce `Fiber.annotation` for attaching messages to fibers.

Issue #19056 has been updated by ioquatix (Samuel Williams).


I came back to this issue.

> I don't see the convenience of `Fiber.annotate`. Convince me.

- Logging what the current fiber is doing.
- Recording what the current fiber is doing when an error or exception occurs.
- Real time debugger output (e.g. as shown in the screenshot).

> Users need to understand how to use Fiber#annotation wisely. Need documents.

Yes, I am happy to include documentation about it.

> The state should be stacked, not overridden. How do you think?

What about:

```ruby
Fiber.annotate "x" do
  Fiber.annotation # "x"
  Fiber.annotate "y" do
    Fiber.annotation # "y"
  end
  Fiber.annotation # "x" 
end
```

> I have a bit of performance concern. Is it OK?

It's a single pointer assignment so it should be minimal. Compared to "blocking operations" it should be irrelevant.

In order to try this out more generally, I created a gem. You can see the proposed implementation here: https://github.com/ioquatix/fiber-annotate/blob/main/lib/fiber/annotate.rb

The reason to make this a core interface, is so that default gems can use it.


----------------------------------------
Feature #19056: Introduce `Fiber.annotation` for attaching messages to fibers.
https://bugs.ruby-lang.org/issues/19056#change-103398

* Author: ioquatix (Samuel Williams)
* Status: Open
* Priority: Normal
* Assignee: ioquatix (Samuel Williams)
----------------------------------------
It's useful to know what a fiber is doing especially when they have a temporal execution (i.e. sockets connecting vs connected, binding vs accepting, queue popping, etc)

Let's introduce `Fiber.annotate` and `Fiber#annotation` for logging a short message attached to Fibers.

```ruby
Fiber.annotate "Counting to 10"
10.times{|I| puts I}

# Fiber.current.annotation => "Counting to 10"
```

Pull Request: https://github.com/ruby/ruby/pull/6554

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clipboard-202210160132-n7lzp.png (865 KB)


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