Finch unknown registry crash on application start up

atomkirk · August 21, 2024, 6:40pm

I can’t figure out why I keep getting this error. I’m starting finch as the first child process. Does anyone know?

Has anyone seen this before?

Finch is started at the very top of my children list in application.ex

al2o3cr · August 21, 2024, 7:05pm

I don’t think it’s getting to the stuff in your application.ex, based on the reference to a line in Pigeon:

codedge-llc/pigeon/blob/master/lib/pigeon/application.ex#L10


      
          defmodule Pigeon.Application do
            @moduledoc false
          
            use Application
            alias Pigeon.APNS
            alias Pigeon.Http2.Client
          
            @doc false
            def start(_type, _args) do
              Client.default().start
          
              children = [
                Pigeon.Registry,
                {APNS.Token, %{}},
                {Task.Supervisor, name: Pigeon.Tasks}
              ]
          
              opts = [strategy: :one_for_one, name: :pigeon]
              Supervisor.start_link(children, opts)
            end

(the Client.default().start one)

The BEAM is going to bring up the application’s dependencies before it tries to start the application.

I’m unsure on how Finch gets involved, though; are you passing a custom http2_client configuration to Pigeon?

I’m also unsure about that call to :telemetry.span in the stacktrace, is that happening in application code someplace?

atomkirk · August 21, 2024, 7:07pm

The errors randomly alternate between pigeon and telemetry being in the stack trace, so I’m not sure its pigeon specific. And I already looked and I’m not telling pigeon about finch at all…

wojtekmach · August 21, 2024, 7:16pm

This looks similar: ArgumentError: unknown registry · Issue #277 · sneako/finch · GitHub.

I’m unsure on how Finch gets involved, though; are you passing a custom http2_client configuration to Pigeon?

Yeah this is a good question! Pigeon seems to be grabbing a token on its application start so it’s plausible it’s using Finch.

If not your app, perhaps one of your deps is also using Pigeon and globally configuring it to use Finch? But then it’s unclear how it would get that pool name which seems specific to your app I suppose.

atomkirk · August 21, 2024, 7:24pm

is there a way to delay the startup of processes? its some kind of race condition because my pods start up some percent of the time.

atomkirk · August 21, 2024, 7:31pm

heres something I’ve never understood, does elixir start up dependency processes invisibly? I have a Jump.APNS in my children list that I figured was starting pigeon, but maybe pigeon is starting its own thing via its own application.ex?

wojtekmach · August 21, 2024, 7:54pm

Yes! If you have deps and they have application callback modules, their start/2 callbacks would be called before your start/2.

wojtekmach · August 21, 2024, 8:02pm

Oh, I was looking at latest pigeon version on hex.pm, but you’re using 2.0.0-rc.2 and 2.0.0-rc.2 is using Goth. Are you you or your dependencies configuring Goth to use Finch with your Finch pool by any chance?

atomkirk · August 21, 2024, 8:05pm

I don’t see any config telling goth to use finch. I’m using Tesla with finch as the adapter for tesla. I don’t see pigeon or goth being configured to use tesla either…

wojtekmach · August 21, 2024, 8:21pm

Nevermind, goth is a red herring, I believe it should be good. Sorry about that.

jswanner · August 21, 2024, 9:59pm

Is there anywhere in your configs where you specify Jump.Finch? Specifically I’m thinking of any config for dependencies

andyleclair · August 23, 2024, 7:57pm

This is what I thought as well. You may have some application configured to use Jump.Finch that’s started before your Finch is started.