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phoenix lib phoenix endpoint sync_code_reload_plug.ex
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lib/phoenix/endpoint/sync_code_reload_plug.ex 

defmodule Phoenix.Endpoint.SyncCodeReloadPlug do

  @moduledoc ~S"""

  Wraps an Endpoint, attempting to sync with Phoenix's code reloader if 

  an exception is raising which indicates that we may be in the middle of a reload.



  We detect this by looking at the raised exception and seeing if it indicates

  that the endpoint is not defined. This indicates that the code reloader may be 

  mid way through a compile, and that we should attempt to retry the request

  after the compile has completed. This is also why this must be implemented in

  a separate module (one that is not recompiled in a typical code reload cycle),

  since otherwise it may be the case that the endpoint itself is not defined.

  """



  @behaviour Plug



  def init({endpoint, opts}), do: {endpoint, endpoint.init(opts)}



  def call(conn, {endpoint, opts}), do: do_call(conn, endpoint, opts, true)



  defp do_call(conn, endpoint, opts, retry?) do

    try do

      endpoint.call(conn, opts)

    rescue

      exception in [UndefinedFunctionError] ->

        case exception do

          %UndefinedFunctionError{module: ^endpoint} when retry? ->

            # Sync with the code reloader and retry once

            Phoenix.CodeReloader.sync()

            do_call(conn, endpoint, opts, false)



          exception ->

            reraise(exception, __STACKTRACE__)

        end

    end

  end

end