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scout_apm

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ScoutAPM agent for Phoenix & Elixir projects. For more information, visit https://www.scoutapm.com/agents/elixir-phoenix-monitoring.

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scout_apm lib scout_apm watcher.ex
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lib/scout_apm/watcher.ex 

defmodule ScoutApm.Watcher do

  @moduledoc """

  A simple module to log when a watched process fails. Only works to watch

  module based workers currently, not arbitrary pids. See usage in application.ex

  """



  use GenServer



  @server __MODULE__



  def start_link(mod) do

    name = mod

    |> Atom.to_string

    |> Kernel.<>(".Watcher")

    |> String.to_atom



    GenServer.start_link(@server, mod, name: name)

  end



  def init(mod) do

    Process.monitor(mod)

    ScoutApm.Logger.log(:info, "Setup ScoutApm.Watcher on #{inspect mod}")

    {:ok, :ok}

  end



  # If the logger itself is the one that died on us, we probably will

  # not log that. Also, I'm not sure of the order of events. Say that

  # `Store` crashes, both the supervisor and this watcher get notified,

  # but the supervisor will shut down and restart this process as well.

  def handle_info({:DOWN, _, _, {what, _node}, reason}, state) do

    ScoutApm.Logger.log(:info, "ScoutAPM Watcher: #{inspect what} Stopped: #{inspect reason}")

    {:stop, :normal, state}

  end

end