Improving Rails compatability

[wtn]

When using the Rails adapter, there are some side effects.

For example, there's no more ActionDispatch::RequestId inside the adapter block, so the Rails log entries after that point don't have a UUID:

[b6dd98ad-773c-4d0e-8071-c90e4aeab370] p0 fiber=41780 thread=41640
[b6dd98ad-773c-4d0e-8071-c90e4aeab370] Completed 101 Switching Protocols in 19ms (ActiveRecord: 4.1ms | Allocations: 7388)
[b6dd98ad-773c-4d0e-8071-c90e4aeab370] RackProtocolToConnectionUpgrade found rack.protocol=websocket in HTTP/1.1 response, setting 'upgrade' and 'connection' headers
p1 fiber=41780 thread=41640
p2 fiber=41780 thread=41640

For another example, if multiple databases are used with Active Record, any switching has to be re-done inside the adapter block.

[ioquatix]

Have you enabled fiber per request mode?

I'll have to take a look at ActionDispatch::RequestId, do you know if it uses fiber local storage or thread local storage?

https://blog.saeloun.com/2022/02/23/rails-fiber-safe-connection-pools/ has a good explanation.

(BTW, I don't know if this is the solution or not, maybe we need to use Fiber.storage.)