Add some methods

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

lib/service/streamer.ex

@@ -0,0 +1,145 @@
+defmodule Eventos.Service.Streamer do
+  use GenServer
+  require Logger
+  alias Eventos.Accounts.Actor
+
+  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: "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("user", socket) do
+    "user:#{socket.assigns[:user].id}"
+  end
+
+  defp internal_topic(topic, _), do: topic
+end