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scout_apm

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ScoutAPM agent for Phoenix & Elixir projects. For more information, visit https://www.scoutapm.com/agents/elixir-phoenix-monitoring.

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scout_apm lib scout_apm internal context.ex
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lib/scout_apm/internal/context.ex 

defmodule ScoutApm.Internal.Context do

  @moduledoc """

  Internal representation of a Context. As a user of ScoutApm, you

  likely will not need this module

  """



  defstruct [:type, :key, :value]



  @valid_types [:user, :extra]

  @type context_types :: :user | :extra



  @type t :: %__MODULE__{

    type: context_types,

    key: String.t,

    value: number | boolean | String.t,

  }



  def new(type, key, value) do

    case {valid_type?(type), valid_key?(key), valid_value?(value)} do

      {false, _, _} ->

        {:error, {:type, :invalid}}



      {_, false, _} ->

        {:error, {:key, :invalid_type}}



      {_, _, false} ->

        {:error, {:value, :invalid_type}}



      {true, true, true} ->

        {:ok, %__MODULE__{type: type, key: key, value: value}}

    end

  end



  defp valid_type?(t) when t in @valid_types, do: true

  defp valid_type?(_), do: false



  defp valid_key?(key) when is_binary(key), do: String.printable?(key)

  defp valid_key?(key) when is_atom(key), do: key |> to_string |> String.printable?

  defp valid_key?(_), do: false



  defp valid_value?(val) when is_binary(val), do: String.printable?(val)

  defp valid_value?(val) when is_boolean(val), do: true

  defp valid_value?(val) when is_number(val), do: true

  defp valid_value?(_), do: false

end