defmodule Pleroma.Web.Streamer do use GenServer require Logger alias Pleroma.{User, Notification} def init(args) do {:ok, args} end def start_link do spawn(fn -> # 30 seconds Process.sleep(1000 * 30) GenServer.cast(__MODULE__, %{action: :ping}) end) GenServer.start_link(__MODULE__, %{}, name: __MODULE__) end def add_socket(topic, socket) do GenServer.cast(__MODULE__, %{action: :add, socket: socket, topic: topic}) end def remove_socket(topic, socket) do GenServer.cast(__MODULE__, %{action: :remove, socket: socket, topic: topic}) end def stream(topic, item) do GenServer.cast(__MODULE__, %{action: :stream, topic: topic, item: item}) end def handle_cast(%{action: :ping}, topics) do Map.values(topics) |> List.flatten() |> Enum.each(fn socket -> Logger.debug("Sending keepalive ping") send(socket.transport_pid, {:text, ""}) end) spawn(fn -> # 30 seconds Process.sleep(1000 * 30) GenServer.cast(__MODULE__, %{action: :ping}) end) {:noreply, topics} end def handle_cast(%{action: :stream, topic: "direct", item: item}, topics) do recipient_topics = User.get_recipients_from_activity(item) |> Enum.map(fn %{id: id} -> "direct:#{id}" end) Enum.each(recipient_topics || [], fn user_topic -> Logger.debug("Trying to push direct message to #{user_topic}\n\n") push_to_socket(topics, user_topic, item) end) {:noreply, topics} end def handle_cast(%{action: :stream, topic: "user", item: %Notification{} = item}, topics) do topic = "user:#{item.user_id}" Enum.each(topics[topic] || [], fn socket -> json = %{ event: "notification", payload: Pleroma.Web.MastodonAPI.MastodonAPIController.render_notification( socket.assigns["user"], item ) |> Jason.encode!() } |> Jason.encode!() send(socket.transport_pid, {:text, json}) end) {:noreply, topics} end def handle_cast(%{action: :stream, topic: "user", item: item}, topics) do Logger.debug("Trying to push to users") recipient_topics = User.get_recipients_from_activity(item) |> Enum.map(fn %{id: id} -> "user:#{id}" end) Enum.each(recipient_topics, fn topic -> push_to_socket(topics, topic, item) end) {:noreply, topics} end def handle_cast(%{action: :stream, topic: topic, item: item}, topics) do Logger.debug("Trying to push to #{topic}") Logger.debug("Pushing item to #{topic}") push_to_socket(topics, topic, item) {:noreply, topics} end def handle_cast(%{action: :add, topic: topic, socket: socket}, sockets) do topic = internal_topic(topic, socket) sockets_for_topic = sockets[topic] || [] sockets_for_topic = Enum.uniq([socket | sockets_for_topic]) sockets = Map.put(sockets, topic, sockets_for_topic) Logger.debug("Got new conn for #{topic}") {:noreply, sockets} end def handle_cast(%{action: :remove, topic: topic, socket: socket}, sockets) do topic = internal_topic(topic, socket) sockets_for_topic = sockets[topic] || [] sockets_for_topic = List.delete(sockets_for_topic, socket) sockets = Map.put(sockets, topic, sockets_for_topic) Logger.debug("Removed conn for #{topic}") {:noreply, sockets} end def handle_cast(m, state) do Logger.info("Unknown: #{inspect(m)}, #{inspect(state)}") {:noreply, state} end def push_to_socket(topics, topic, item) do Enum.each(topics[topic] || [], fn socket -> # Get the current user so we have up-to-date blocks etc. user = User.get_cached_by_ap_id(socket.assigns[:user].ap_id) blocks = user.info["blocks"] || [] unless item.actor in blocks do json = %{ event: "update", payload: Pleroma.Web.MastodonAPI.StatusView.render( "status.json", activity: item, for: user ) |> Jason.encode!() } |> Jason.encode!() send(socket.transport_pid, {:text, json}) end end) end defp internal_topic(topic, socket) when topic in ~w[user, direct] do "#{topic}:#{socket.assigns[:user].id}" end defp internal_topic(topic, _), do: topic end