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mongodb_driver

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The MongoDB driver for Elixir

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mongodb_driver lib mongo event_handler.ex
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lib/mongo/event_handler.ex 

defmodule Mongo.EventHandler do

  @moduledoc false



  require Logger



  @all [:commands, :topology]



  def start(opts \\ [topics: [:commands]]) do

    spawn(__MODULE__, :register, [opts])

  end



  def register(opts) do

    with true <- (opts[:topics] || @all)

                |> Enum.map(fn topic -> Registry.register(:events_registry, topic, []) end)

                |> Enum.all?(fn

                  {:ok, _} -> true

                  _other   -> false

                end) do

      listen(opts)

      :ok

    end

  end



  def listen(opts) do

    receive do

      {:broadcast, :commands, %{command_name: cmd} = message} when cmd != :isMaster ->

        Logger.info("Received command: " <> (inspect message))

        listen(opts)



      {:broadcast, :commands, is_master} ->

        case opts[:is_master] do

          true -> Logger.info("Received is master:" <> (inspect is_master))

          _ -> []

        end

        listen(opts)



      {:broadcast, topic, message} ->

        Logger.info("Received #{topic}: " <> (inspect message))

        listen(opts)



      other ->

        Logger.info("Stopping EventHandler received unknown message:" <> inspect other)

    end

  end



end