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Step flow manager for Elixir applications

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step_flow lib step_flow amqp connection.ex
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lib/step_flow/amqp/connection.ex 

defmodule StepFlow.Amqp.Connection do

  require Logger



  @moduledoc false



  @submit_exchange "job_submit"



  use GenServer

  alias StepFlow.Amqp.Helpers



  def start_link do

    GenServer.start_link(__MODULE__, :ok, name: __MODULE__)

  end



  def consume(queue, callback) do

    GenServer.cast(__MODULE__, {:consume, queue, callback})

  end



  def publish(queue, message, options) do

    GenServer.cast(__MODULE__, {:publish, queue, message, options})

  end



  # def publish_json(queue, message) do

  #   publish(queue, message |> Jason.encode!())

  # end



  def init(:ok) do

    Logger.warn("#{__MODULE__} init")

    rabbitmq_connect()

  end



  def handle_cast({:publish, queue, message, options}, conn) do

    Logger.warn("#{__MODULE__}: publish message on queue: #{queue} #{message}")

    AMQP.Basic.publish(conn.channel, @submit_exchange, queue, message, options)

    {:noreply, conn}

  end



  def handle_cast({:consume, queue, _callback}, conn) do

    Logger.warn("#{__MODULE__}: consume messages on queue: #{queue}")

    # AMQP.Queue.declare(conn.channel, queue, durable: false)

    {:ok, _consumer_tag} = AMQP.Basic.consume(conn, queue)

    {:noreply, conn}

  end



  def handle_info({:DOWN, _, :process, _pid, _reason}, _) do

    {:ok, chan} = rabbitmq_connect()

    {:noreply, chan}

  end



  def terminate(_reason, state) do

    AMQP.Connection.close(state.connection)

  end



  defp rabbitmq_connect do

    url = Helpers.get_amqp_connection_url()



    case AMQP.Connection.open(url) do

      {:ok, connection} ->

        init_amqp_connection(connection)



      {:error, message} ->

        Logger.error("#{__MODULE__}: unable to connect to: #{url}, reason: #{inspect(message)}")



        # Reconnection loop

        :timer.sleep(10_000)

        rabbitmq_connect()

    end

  end



  defp init_amqp_connection(connection) do

    Process.monitor(connection.pid)



    {:ok, channel} = AMQP.Channel.open(connection)



    # AMQP.Queue.declare(channel, queue)

    # Logger.warn("#{__MODULE__}: connected to queue #{queue}")



    AMQP.Exchange.topic(channel, @submit_exchange,

      durable: true,

      arguments: [{"alternate-exchange", :longstr, "job_queue_not_found"}]

    )



    AMQP.Exchange.fanout(channel, "job_queue_not_found", durable: true)



    AMQP.Queue.declare(channel, "job_queue_not_found")

    AMQP.Queue.bind(channel, "job_queue_not_found", "job_queue_not_found")



    {:ok, %{channel: channel, connection: connection}}

  end

end