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New Relic's Open-Source Elixir Agent

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new_relic_agent lib new_relic util error.ex
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lib/new_relic/util/error.ex 

defmodule NewRelic.Util.Error do

  # Helper functions for normalizing and formatting errors



  @moduledoc false



  def normalize(kind, exception, stacktrace, initial_call \\ nil)



  def normalize(kind, exception, stacktrace, initial_call) do

    normalized_error = Exception.normalize(kind, exception, stacktrace)



    exception_type = format_type(kind, normalized_error)

    exception_reason = format_reason(kind, normalized_error)

    exception_stacktrace = format_stacktrace(stacktrace, initial_call)



    {exception_type, exception_reason, exception_stacktrace}

  end



  def format_type(:error, %ErlangError{original: {_reason, {module, function, args}}}),

    do: Exception.format_mfa(module, function, length(args))



  def format_type(:error, %{__struct__: struct}), do: inspect(struct)

  def format_type(:exit, _reason), do: "EXIT"



  def format_reason(:error, %ErlangError{original: {reason, {module, function, args}}}),

    do: "(" <> Exception.format_mfa(module, function, length(args)) <> ") " <> inspect(reason)



  def format_reason(:error, error),

    do:

      :error

      |> Exception.format_banner(error)

      |> String.replace("** ", "")



  def format_reason(:exit, {reason, {module, function, args}}),

    do: "(" <> Exception.format_mfa(module, function, length(args)) <> ") " <> inspect(reason)



  def format_reason(:exit, %{__exception__: true} = error), do: format_reason(:error, error)

  def format_reason(:exit, reason), do: inspect(reason)



  def format_stacktrace(stacktrace, initial_call),

    do:

      stacktrace

      |> prepend_initial_call(initial_call)

      |> Enum.map(&Exception.format_stacktrace_entry/1)



  defp prepend_initial_call(stacktrace, {mod, fun, args}),

    do: stacktrace ++ [{mod, fun, args, []}]



  defp prepend_initial_call(stacktrace, _), do: stacktrace

end