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New Relic's Open-Source Elixir Agent

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new_relic_agent lib new_relic util event.ex
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lib/new_relic/util/event.ex 

defmodule NewRelic.Util.Event do

  @moduledoc false



  def process_event(event), do: Map.new(event, &process_attr/1)



  defp process_attr({key, val}) when is_binary(val), do: {key, val |> limit_size}

  defp process_attr({key, val}) when is_bitstring(val), do: {key, val |> inspect |> limit_size}

  defp process_attr({key, val}) when is_pid(val), do: {key, val |> inspect}

  defp process_attr({key, val}), do: {key, val}



  @max_string 4096

  defp limit_size(string) when byte_size(string) < @max_string, do: string



  defp limit_size(string) do

    index = find_truncation_point(string)

    String.slice(string, 0, index)

  end



  defp find_truncation_point(string, len \\ 0)



  defp find_truncation_point("", len), do: len



  defp find_truncation_point(string, len) do

    case next_grapheme_size(string) do

      {char_size, rest} when len + char_size < @max_string ->

        find_truncation_point(rest, len + char_size)



      _ ->

        len

    end

  end



  defp next_grapheme_size(string) do

    {grapheme, rest} = String.next_grapheme(string)

    {byte_size(grapheme), rest}

  end

end