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       # 30 seconds
   9       Process.sleep(1000 * 30)
  10       GenServer.cast(__MODULE__, %{action: :ping})
  11     end)
  12
  13     GenServer.start_link(__MODULE__, %{}, name: __MODULE__)
  14   end
  15
  16   def add_socket(topic, socket) do
  17     GenServer.cast(__MODULE__, %{action: :add, socket: socket, topic: topic})
  18   end
  19
  20   def remove_socket(topic, socket) do
  21     GenServer.cast(__MODULE__, %{action: :remove, socket: socket, topic: topic})
  22   end
  23
  24   def stream(topic, item) do
  25     GenServer.cast(__MODULE__, %{action: :stream, topic: topic, item: item})
  26   end
  27
  28   def handle_cast(%{action: :ping}, topics) do
  29     Map.values(topics)
  30     |> List.flatten()
  31     |> Enum.each(fn socket ->
  32       Logger.debug("Sending keepalive ping")
  33       send(socket.transport_pid, {:text, ""})
  34     end)
  35
  36     spawn(fn ->
  37       # 30 seconds
  38       Process.sleep(1000 * 30)
  39       GenServer.cast(__MODULE__, %{action: :ping})
  40     end)
  41
  42     {:noreply, topics}
  43   end
  44
  45   def handle_cast(%{action: :stream, topic: "user", item: %Notification{} = item}, topics) do
  46     topic = "user:#{item.user_id}"
  47
  48     Enum.each(topics[topic] || [], fn socket ->
  49       json =
  50         %{
  51           event: "notification",
  52           payload:
  53             Pleroma.Web.MastodonAPI.MastodonAPIController.render_notification(
  54               socket.assigns["user"],
  55               item
  56             )
  57             |> Jason.encode!()
  58         }
  59         |> Jason.encode!()
  60
  61       send(socket.transport_pid, {:text, json})
  62     end)
  63
  64     {:noreply, topics}
  65   end
  66
  67   def handle_cast(%{action: :stream, topic: "user", item: item}, topics) do
  68     Logger.debug("Trying to push to users")
  69
  70     recipient_topics =
  71       User.get_recipients_from_activity(item)
  72       |> Enum.map(fn %{id: id} -> "user:#{id}" end)
  73
  74     Enum.each(recipient_topics, fn topic ->
  75       push_to_socket(topics, topic, item)
  76     end)
  77
  78     {:noreply, topics}
  79   end
  80
  81   def handle_cast(%{action: :stream, topic: topic, item: item}, topics) do
  82     Logger.debug("Trying to push to #{topic}")
  83     Logger.debug("Pushing item to #{topic}")
  84     push_to_socket(topics, topic, item)
  85     {:noreply, topics}
  86   end
  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     {:noreply, sockets}
  95   end
  96
  97   def handle_cast(%{action: :remove, topic: topic, socket: socket}, sockets) do
  98     topic = internal_topic(topic, socket)
  99     sockets_for_topic = sockets[topic] || []
 100     sockets_for_topic = List.delete(sockets_for_topic, socket)
 101     sockets = Map.put(sockets, topic, sockets_for_topic)
 102     Logger.debug("Removed conn for #{topic}")
 103     {:noreply, sockets}
 104   end
 105
 106   def handle_cast(m, state) do
 107     Logger.info("Unknown: #{inspect(m)}, #{inspect(state)}")
 108     {:noreply, state}
 109   end
 110
 111   def push_to_socket(topics, topic, item) do
 112     Enum.each(topics[topic] || [], fn socket ->
 113       json =
 114         %{
 115           event: "update",
 116           payload:
 117             Pleroma.Web.MastodonAPI.StatusView.render(
 118               "status.json",
 119               activity: item,
 120               for: socket.assigns[:user]
 121             )
 122             |> Jason.encode!()
 123         }
 124         |> Jason.encode!()
 125
 126       send(socket.transport_pid, {:text, json})
 127     end)
 128   end
 129
 130   defp internal_topic("user", socket) do
 131     "user:#{socket.assigns[:user].id}"
 132   end
 133
 134   defp internal_topic(topic, _), do: topic
 135 end