Modules don't compose well

[michalmuskala]

@svarlet

I believe that the application’s entrypoint should make all the plumbing/wiring decisions (what X to use in a Y and what Y to use in a Z). In some languages, it’s the “main” file. In Elixir, that would be application.ex .

I agree with this sooo much. I think the problem lies exactly in the fact that we can’t inject state into the Plug connections from the regular supervision structure - for any other processes we have start_link and the init callback or other mechanisms, where we can set-up the state for the process - including dependencies, but we entirely lack that possibility with plug. For some reason Plug tries to enforce completely stateless processes.