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

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