server.ex

defmodule Junction.Receiver do
  require Logger
  use GenServer

  alias Junction.Types.Log

  def start_link(opts \\ []) do
    GenServer.start_link(__MODULE__, :ok, opts)
  end

  def parse_packet(data) do
    <<
      key        :: bytes-size(16),
      length     :: little-unsigned-integer-size(32),
      message    :: binary
    >> = data

    message = %Log{
      key: UUID.binary_to_string!(key),
      length: length,
      message: message
    }
  end

  def init(:ok) do
    {:ok, _socket} = :gen_udp.open(11110)
  end

  def handle_info({:udp, _socket, _ip, _port, raw}, state) do
    Logger.info "Raw: " <> inspect(raw)
    message = parse_packet(raw)
    Logger.info "Received a secret message! " <> inspect(message)
    {:noreply, state}
  end

  def handle_info({_, _socket}, state) do
    {:noreply, state}
  end
end