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bypass

0.8.1
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Bypass provides a quick way to create a custom plug that can be put in place instead of an actual HTTP server to return prebaked responses to client requests. This is helpful when you want to create a mock HTTP server and test how your HTTP client handles different types of server responses.

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bypass lib bypass plug.ex
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lib/bypass/plug.ex 

defmodule Bypass.Plug do

  def init([pid]), do: pid



  def call(%{method: method, request_path: request_path} = conn, pid) do

    route = Bypass.Instance.call(pid, {:get_route, method, request_path})

    ref = make_ref()

    case Bypass.Instance.call(pid, {:get_expect_fun, route}) do

      fun when is_function(fun, 1) ->

        retain_current_plug(pid, route, ref)

        try do

          fun.(conn)

        else

          conn ->

            put_result(pid, route, ref, :ok_call)

            conn

        catch

          class, reason ->

            stacktrace = System.stacktrace

            put_result(pid, route, ref, {:exit, {class, reason, stacktrace}})

            :erlang.raise(class, reason, stacktrace)

        end

      {:error, error, route} ->

        put_result(pid, route, ref, {:error, error, route})

        raise "Route error"

    end

  end



  defp retain_current_plug(pid, route, ref) do

    Bypass.Instance.cast(pid, {:retain_plug_process, route, ref, self()})

  end



  defp put_result(pid, route, ref, result) do

    Bypass.Instance.call(pid, {:put_expect_result, route, ref, result})

  end

end