git.squeep.com Git - akkoma/blob - lib/pleroma/web/streamer.ex

   1 defmodule Pleroma.Web.Streamer do
   2   use GenServer
   3   require Logger
   4   alias Pleroma.{User, Notification}
   5
   6   def start_link do
   7     spawn(fn ->
   8       Process.sleep(1000 * 30) # 30 seconds
   9       GenServer.cast(__MODULE__, %{action: :ping})
  10     end)
  11     GenServer.start_link(__MODULE__, %{}, name: __MODULE__)
  12   end
  13
  14   def add_socket(topic, socket) do
  15     GenServer.cast(__MODULE__, %{action: :add, socket: socket, topic: topic})
  16   end
  17
  18   def remove_socket(topic, socket) do
  19     GenServer.cast(__MODULE__, %{action: :remove, socket: socket, topic: topic})
  20   end
  21
  22   def stream(topic, item) do
  23     GenServer.cast(__MODULE__, %{action: :stream, topic: topic, item: item})
  24   end
  25
  26   def handle_cast(%{action: :ping}, topics) do
  27     Map.values(topics)
  28     |> List.flatten
  29     |> Enum.each(fn (socket) ->
  30       Logger.debug("Sending keepalive ping")
  31       send socket.transport_pid, {:text, ""}
  32     end)
  33     spawn(fn ->
  34       Process.sleep(1000 * 30) # 30 seconds
  35       GenServer.cast(__MODULE__, %{action: :ping})
  36     end)
  37     {:noreply, topics}
  38   end
  39
  40   def handle_cast(%{action: :stream, topic: "user", item: %Notification{} = item}, topics) do
  41     topic = "user:#{item.user_id}"
  42     Enum.each(topics[topic] || [], fn (socket) ->
  43       json = %{
  44         event: "notification",
  45         payload: Pleroma.Web.MastodonAPI.MastodonAPIController.render_notification(socket.assigns["user"], item) |> Jason.encode!
  46       } |> Jason.encode!
  47
  48       send socket.transport_pid, {:text, json}
  49     end)
  50     {:noreply, topics}
  51   end
  52
  53   def handle_cast(%{action: :stream, topic: "user", item: item}, topics) do
  54     Logger.debug("Trying to push to users")
  55     recipient_topics = User.get_recipients_from_activity(item)
  56     |> Enum.map(fn (%{id: id}) -> "user:#{id}" end)
  57
  58     Enum.each(recipient_topics, fn (topic) ->
  59       push_to_socket(topics, topic, item)
  60     end)
  61     {:noreply, topics}
  62   end
  63
  64   def handle_cast(%{action: :stream, topic: topic, item: item}, topics) do
  65     Logger.debug("Trying to push to #{topic}")
  66     Logger.debug("Pushing item to #{topic}")
  67     push_to_socket(topics, topic, item)
  68     {:noreply, topics}
  69   end
  70
  71   def handle_cast(%{action: :add, topic: topic, socket: socket}, sockets) do
  72     topic = internal_topic(topic, socket)
  73     sockets_for_topic = sockets[topic] || []
  74     sockets_for_topic = Enum.uniq([socket | sockets_for_topic])
  75     sockets = Map.put(sockets, topic, sockets_for_topic)
  76     Logger.debug("Got new conn for #{topic}")
  77     {:noreply, sockets}
  78   end
  79
  80   def handle_cast(%{action: :remove, topic: topic, socket: socket}, sockets) do
  81     topic = internal_topic(topic, socket)
  82     sockets_for_topic = sockets[topic] || []
  83     sockets_for_topic = List.delete(sockets_for_topic, socket)
  84     sockets = Map.put(sockets, topic, sockets_for_topic)
  85     Logger.debug("Removed conn for #{topic}")
  86     {:noreply, sockets}
  87   end
  88
  89   def handle_cast(m, state) do
  90     Logger.info("Unknown: #{inspect(m)}, #{inspect(state)}")
  91     {:noreply, state}
  92   end
  93
  94   def push_to_socket(topics, topic, item) do
  95     Enum.each(topics[topic] || [], fn (socket) ->
  96       json = %{
  97         event: "update",
  98         payload: Pleroma.Web.MastodonAPI.StatusView.render("status.json", activity: item, for: socket.assigns[:user]) |> Jason.encode!
  99       } |> Jason.encode!
 100
 101       send socket.transport_pid, {:text, json}
 102     end)
 103   end
 104
 105   defp internal_topic("user", socket) do
 106     "user:#{socket.assigns[:user].id}"
 107   end
 108
 109   defp internal_topic(topic, _), do: topic
 110 end