defmodule PolicyService.MessageBus do
  use AMQP

  def publish(routing_key, event) do
    payload = Jason.encode!(event)

    :ok =
      AMQP.Basic.publish(channel(), "policy_service.events", routing_key, payload,
        content_type: "application/json",
        # survives RabbitMQ restart
        persistent: true
      )
  end

  defp channel do
    {:ok, conn} = AMQP.Connection.open(amqp_url())
    {:ok, chan} = AMQP.Channel.open(conn)
    chan
  end

  defp amqp_url, do: Application.fetch_env!(:policy_service, :amqp_url)
end