implement Plugs for setting log file path dinamically

router.ex

  pipeline :browser do
    plug :accepts, ["html"]
    plug :fetch_session
    plug :fetch_flash
    plug :protect_from_forgery
    plug :put_secure_browser_headers
    plug :set_log1_file_daily
    plug :set_log2_file_daily
  end  
  
  defp set_log1_file_daily(conn, _opts) do
    today = Timex.now("Japan") |> Timex.format!("{YYYY}{0M}{0D}")
    Logger.configure_backend {LoggerFileBackend, :log1},
      path: Path.join([File.cwd!, "var", "log", "log1-#{today}.log"])

    conn #Plug should return conn.
  end

  defp set_log2_file_daily(conn, _opts) do
    today = Timex.now("Japan") |> Timex.format!("{YYYY}{0M}{0D}")
    Logger.configure_backend {LoggerFileBackend, :log2},
      path: Path.join([File.cwd!, "var", "log", "log2-#{today}.log"])

    conn #Plug should return conn.
  end