Handling long polling and trapping shutdown

controller.ex

  def wait(conn, _params) do
    Logger.info("start - #{inspect(self())}")
    Logger.info("Sleeping...")
    Process.flag(:trap_exit, true)

    result =
      receive do
        {:EXIT, _caller, :shutdown} ->
          Logger.info("Got shutdown")
          :shutdown
      after
        20_000 ->
          :timeout
      end

    # Need to reset flag as the process is recycled
    Process.flag(:trap_exit, false)
    Logger.info("Replying")

    conn
    |> text("OK - #{inspect(self())} #{inspect(result)}")
  end

send-sig-term.sh

#!/bin/bash
pid=$(ps aux | grep beam | grep phx | awk '{print $2}') ; kill -s TERM $pid