Streamer, SideEffects: Stream out ChatMessageReferences

Saves us a few calles to fetch things from the DB that we already
have.

lib/pleroma/web/activity_pub/side_effects.ex

@@ -140,11 +140,15 @@ defmodule Pleroma.Web.ActivityPub.SideEffects do
       |> Enum.each(fn [user, other_user] ->
         if user.local do
           {:ok, chat} = Chat.bump_or_create(user.id, other_user.ap_id)
-          ChatMessageReference.create(chat, object, user.ap_id == actor.ap_id)
+          {:ok, cm_ref} = ChatMessageReference.create(chat, object, user.ap_id == actor.ap_id)
+
+          Streamer.stream(
+            ["user", "user:pleroma_chat"],
+            {user, %{cm_ref | chat: chat, object: object}}
+          )
         end
       end)
 
-      Streamer.stream(["user", "user:pleroma_chat"], object)
       {:ok, object, meta}
     end
   end

lib/pleroma/web/streamer/streamer.ex

@@ -6,11 +6,11 @@ defmodule Pleroma.Web.Streamer do
   require Logger
 
   alias Pleroma.Activity
+  alias Pleroma.ChatMessageReference
   alias Pleroma.Config
   alias Pleroma.Conversation.Participation
   alias Pleroma.Notification
   alias Pleroma.Object
-  alias Pleroma.Repo
   alias Pleroma.User
   alias Pleroma.Web.ActivityPub.ActivityPub
   alias Pleroma.Web.ActivityPub.Visibility
@@ -201,22 +201,15 @@ defmodule Pleroma.Web.Streamer do
     end)
   end
 
-  defp do_stream(topic, %{data: %{"type" => "ChatMessage"}} = object)
+  defp do_stream(topic, {user, %ChatMessageReference{} = cm_ref})
        when topic in ["user", "user:pleroma_chat"] do
-    recipients = [object.data["actor"] | object.data["to"]]
+    topic = "#{topic}:#{user.id}"
 
-    topics =
-      %{ap_id: recipients, local: true}
-      |> Pleroma.User.Query.build()
-      |> Repo.all()
-      |> Enum.map(fn %{id: id} = user -> {user, "#{topic}:#{id}"} end)
+    text = StreamerView.render("chat_update.json", %{chat_message_reference: cm_ref})
 
-    Enum.each(topics, fn {user, topic} ->
-      Registry.dispatch(@registry, topic, fn list ->
-        Enum.each(list, fn {pid, _auth} ->
-          text = StreamerView.render("chat_update.json", object, user, recipients)
-          send(pid, {:text, text})
-        end)
+    Registry.dispatch(@registry, topic, fn list ->
+      Enum.each(list, fn {pid, _auth} ->
+        send(pid, {:text, text})
       end)
     end)
   end

lib/pleroma/web/views/streamer_view.ex

@@ -6,36 +6,11 @@ defmodule Pleroma.Web.StreamerView do
   use Pleroma.Web, :view
 
   alias Pleroma.Activity
-  alias Pleroma.Chat
-  alias Pleroma.ChatMessageReference
   alias Pleroma.Conversation.Participation
   alias Pleroma.Notification
   alias Pleroma.User
   alias Pleroma.Web.MastodonAPI.NotificationView
 
-  def render("chat_update.json", object, user, recipients) do
-    chat = Chat.get(user.id, hd(recipients -- [user.ap_id]))
-
-    # Explicitly giving the cmr for the object here, so we don't accidentally
-    # send a later 'last_message' that was inserted between inserting this and
-    # streaming it out
-    cm_ref = ChatMessageReference.for_chat_and_object(chat, object)
-
-    representation =
-      Pleroma.Web.PleromaAPI.ChatView.render(
-        "show.json",
-        %{last_message: cm_ref, chat: chat}
-      )
-
-    %{
-      event: "pleroma:chat_update",
-      payload:
-        representation
-        |> Jason.encode!()
-    }
-    |> Jason.encode!()
-  end
-
   def render("update.json", %Activity{} = activity, %User{} = user) do
     %{
       event: "update",
@@ -76,6 +51,27 @@ defmodule Pleroma.Web.StreamerView do
     |> Jason.encode!()
   end
 
+  def render("chat_update.json", %{chat_message_reference: cm_ref}) do
+    # Explicitly giving the cmr for the object here, so we don't accidentally
+    # send a later 'last_message' that was inserted between inserting this and
+    # streaming it out
+    Logger.debug("Trying to stream out #{inspect(cm_ref)}")
+
+    representation =
+      Pleroma.Web.PleromaAPI.ChatView.render(
+        "show.json",
+        %{last_message: cm_ref, chat: cm_ref.chat}
+      )
+
+    %{
+      event: "pleroma:chat_update",
+      payload:
+        representation
+        |> Jason.encode!()
+    }
+    |> Jason.encode!()
+  end
+
   def render("conversation.json", %Participation{} = participation) do
     %{
       event: "conversation",