defmodule Plug.AccessLog.DefaultFormatter.RequestCookie do
  @moduledoc """
  Fetches a cookie sent by the client for logging.
  """

  import Plug.Conn

  @doc """
  Formats the log output.
  """
  @spec format(Plug.Conn.t, String.t) :: iodata
  def format(conn, cookie) do
    conn = conn |> fetch_cookies()

    case Map.get(conn.cookies, cookie) do
      nil   -> "-"
      value -> value
    end
  end
end