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push_ex

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PushEx is an implementation of Phoenix websockets/channels which handles best practices of running websockets for you, but allows your business logic to be specified through simple behaviour modules.

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push_ex lib push_ex_web channels push_tracker.ex
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lib/push_ex_web/channels/push_tracker.ex 

defmodule PushExWeb.PushTracker do

  @behaviour Phoenix.Tracker



  def child_spec(opts) do

    %{

      id: __MODULE__,

      start: {__MODULE__, :start_link, [opts]},

      type: :supervisor

    }

  end



  def start_link(opts) do

    opts =

      opts

      |> Keyword.put(:name, __MODULE__)

      |> Keyword.put(:pubsub_server, PushEx.PubSub)

      |> Keyword.merge(Application.get_env(:push_ex, __MODULE__) || [])



    Phoenix.Tracker.start_link(__MODULE__, opts, opts)

  end



  def init(opts) do

    server = Keyword.fetch!(opts, :pubsub_server)

    {:ok, %{pubsub_server: server, node_name: Phoenix.PubSub.node_name(server)}}

  end



  def handle_diff(_diff, state) do

    {:ok, state}

  end



  def track(%Phoenix.Socket{topic: topic} = socket) do

    id = PushEx.Config.socket_impl().presence_identifier(socket)



    Phoenix.Tracker.track(__MODULE__, socket.channel_pid, topic, id, %{

      online_at: PushEx.unix_ms_now()

    })

  end



  def listeners?(topic) do

    Phoenix.Tracker.list(__MODULE__, topic)

    |> Enum.any?()

  end

end