instrumentation module.ex

defmodule Instrumentation do
  alias My.Statix

  def success_callback({module, function, args} = mfa, result, start_timestamp),
    do: send_metric(mfa, "success", start_timestamp)

  def error_callback({module, function, args}, error, start_timestamp),
    do: send_metric(mfa, "error", start_timestamp)

  defp send_metric(mfa, suffix, start_timestamp) do
    now = :os.system_time(:microsecond)
    time_it_took_millisecs = (now - start_timestamp)/1000

    metric_name(mfa, suffix)
    |> Statix.measure(time_it_took_millisecs)
  end
end