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A small, fast, and unobtrusive metrics library

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instruments lib probe function.ex
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lib/probe/function.ex 

defmodule Instruments.Probe.Function do

  @moduledoc false

  @behaviour Instruments.Probe



  def probe_init(_name, _probe_type, options) do

    probe_fn = Keyword.fetch!(options, :function)



    {:ok, {probe_fn, nil}}

  end



  def probe_get_value({_, last_value}) do

    {:ok, last_value}

  end



  def probe_reset({probe_fn, _}) do

    {:ok, {probe_fn, nil}}

  end



  def probe_sample({probe_fn, _}) do

    probe_value =

      case probe_fn.() do

        {:ok, result} -> result

        other -> other

      end



    {:ok, {probe_fn, probe_value}}

  end



  def probe_handle_msg(_, state), do: {:ok, state}

end