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New Relic's Open-Source Elixir Agent

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new_relic_agent lib new_relic logger.ex
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lib/new_relic/logger.ex 

defmodule NewRelic.Logger do

  use GenServer

  require Logger



  # Log Agent events to the configured output device

  #  - "tmp/new_relic.log" (Default)

  #  - :memory

  #  - :stdio

  #  - {:file, filename}



  @moduledoc false



  def start_link(_) do

    GenServer.start_link(__MODULE__, :ok, name: __MODULE__)

  end



  def init(:ok) do

    NewRelic.sample_process()

    logger = initial_logger()

    {:ok, io_device} = device(logger)

    {:ok, %{io_device: io_device, logger: logger}}

  end



  # API



  @levels [:debug, :info, :warning, :error]

  def log(level, message) when level in @levels do

    GenServer.cast(__MODULE__, {:log, level, message})

  end



  # Server



  def handle_cast({:log, level, message}, %{io_device: Logger} = state) do

    elixir_logger(level, "new_relic_agent - " <> message)

    {:noreply, state}

  end



  def handle_cast({:log, level, message}, %{io_device: io_device} = state) do

    IO.write(io_device, formatted(level, message))

    {:noreply, state}

  end



  def handle_call(:flush, _from, %{logger: :memory, io_device: io_device} = state) do

    {:reply, StringIO.flush(io_device), state}

  end



  def handle_call(:flush, _from, state) do

    {:reply, "", state}

  end



  def handle_call({:logger, logger}, _from, old_state) do

    {:ok, io_device} = device(logger)

    {:reply, old_state, %{io_device: io_device, logger: logger}}

  end



  def handle_call({:replace, logger}, _from, _old_state) do

    {:reply, :ok, logger}

  end



  # Helpers



  def initial_logger do

    case NewRelic.Config.logger() do

      nil -> :logger

      "file" -> {:file, "tmp/new_relic.log"}

      "stdout" -> :stdio

      "memory" -> :memory

      "Logger" -> :logger

      log_file_path -> {:file, log_file_path}

    end

  end



  defp device(:stdio), do: {:ok, :stdio}

  defp device(:memory), do: StringIO.open("")

  defp device(:logger), do: {:ok, Logger}



  defp device({:file, logfile}) do

    log(:info, "Log File: #{Path.absname(logfile)}")

    logfile |> Path.dirname() |> File.mkdir_p!()

    {:ok, _file} = File.open(logfile, [:append, :utf8])

  end



  defp elixir_logger(:debug, message), do: Logger.debug(message)

  defp elixir_logger(:info, message), do: Logger.info(message)

  defp elixir_logger(:warning, message), do: Logger.warning(message)

  defp elixir_logger(:error, message), do: Logger.error(message)



  @sep " - "

  defp formatted(level, message), do: [formatted(level), @sep, timestamp(), @sep, message, "\n"]

  defp formatted(:debug), do: "[DEBUG]"

  defp formatted(:info), do: "[INFO]"

  defp formatted(:warning), do: "[WARN]"

  defp formatted(:error), do: "[ERROR]"



  defp timestamp do

    :calendar.local_time()

    |> NaiveDateTime.from_erl!()

    |> NaiveDateTime.to_string()

  end

end