Modules don't compose well

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18

I somehow forgot Phoenix.Endpoint.init/1 was only for configuration, but can’t a plug at the start of the endpoint do something similar.

defmodule MyApp.Application do
  def start(_, _) do
    children = [
      {MyApp.AceController, config()}
    ]
    …
  end

  def config() do
    …
  end
end

vs.

defmodule MyApp.Application do
  def start(_, _) do
    children = [
      MyApp.Endpoint
    ]
    …
  end

  def config() do
    …
  end
end

defmodule MyApp.Endpoint do
  plug :prime_with_config

  def prime_with_config(conn, _), 
    do: put_in(conn.private.my_app_config, MyApp.Application.config())
end

In both options the context of execution does get the config. I’m sure the first option would be cleaner, though.

It basically takes a conn, applies all the plugs of the endpoint and any router pipes if any and returns the updated conn. Which should solve the issue of sessions not being available and such.