SideEffects: Move streaming of chats to after the transaction.

lib/pleroma/web/activity_pub/side_effects.ex

@@ -37,7 +37,7 @@ defmodule Pleroma.Web.ActivityPub.SideEffects do
   # - Rollback if we couldn't create it
   # - Set up notifications
   def handle(%{data: %{"type" => "Create"}} = activity, meta) do
-    with {:ok, _object, _meta} <- handle_object_creation(meta[:object_data], meta) do
+    with {:ok, _object, meta} <- handle_object_creation(meta[:object_data], meta) do
       {:ok, notifications} = Notification.create_notifications(activity, do_send: false)
 
       meta =
@@ -142,24 +142,24 @@ defmodule Pleroma.Web.ActivityPub.SideEffects do
       actor = User.get_cached_by_ap_id(object.data["actor"])
       recipient = User.get_cached_by_ap_id(hd(object.data["to"]))
 
-      [[actor, recipient], [recipient, actor]]
-      |> Enum.each(fn [user, other_user] ->
-        if user.local do
-          {:ok, chat} = Chat.bump_or_create(user.id, other_user.ap_id)
-          {:ok, cm_ref} = MessageReference.create(chat, object, user.ap_id != actor.ap_id)
+      streamables =
+        [[actor, recipient], [recipient, actor]]
+        |> Enum.map(fn [user, other_user] ->
+          if user.local do
+            {:ok, chat} = Chat.bump_or_create(user.id, other_user.ap_id)
+            {:ok, cm_ref} = MessageReference.create(chat, object, user.ap_id != actor.ap_id)
 
-          # We add a cache of the unread value here so that it
-          # doesn't change when being streamed out
-          chat =
-            chat
-            |> Map.put(:unread, MessageReference.unread_count_for_chat(chat))
+            {
+              ["user", "user:pleroma_chat"],
+              {user, %{cm_ref | chat: chat, object: object}}
+            }
+          end
+        end)
+        |> Enum.filter(& &1)
 
-          Streamer.stream(
-            ["user", "user:pleroma_chat"],
-            {user, %{cm_ref | chat: chat, object: object}}
-          )
-        end
-      end)
+      meta =
+        meta
+        |> add_streamables(streamables)
 
       {:ok, object, meta}
     end
@@ -208,7 +208,7 @@ defmodule Pleroma.Web.ActivityPub.SideEffects do
   def handle_undoing(object), do: {:error, ["don't know how to handle", object]}
 
   defp send_notifications(meta) do
-    Keyword.get(meta, :created_notifications, [])
+    Keyword.get(meta, :notifications, [])
     |> Enum.each(fn notification ->
       Streamer.stream(["user", "user:notification"], notification)
       Push.send(notification)
@@ -217,15 +217,32 @@ defmodule Pleroma.Web.ActivityPub.SideEffects do
     meta
   end
 
-  defp add_notifications(meta, notifications) do
-    existing = Keyword.get(meta, :created_notifications, [])
+  defp send_streamables(meta) do
+    Keyword.get(meta, :streamables, [])
+    |> Enum.each(fn {topics, items} ->
+      Streamer.stream(topics, items)
+    end)
 
     meta
-    |> Keyword.put(:created_notifications, notifications ++ existing)
+  end
+
+  defp add_streamables(meta, streamables) do
+    existing = Keyword.get(meta, :streamables, [])
+
+    meta
+    |> Keyword.put(:streamables, streamables ++ existing)
+  end
+
+  defp add_notifications(meta, notifications) do
+    existing = Keyword.get(meta, :notifications, [])
+
+    meta
+    |> Keyword.put(:notifications, notifications ++ existing)
   end
 
   def handle_after_transaction(meta) do
     meta
     |> send_notifications()
+    |> send_streamables()
   end
 end

lib/pleroma/web/pleroma_api/views/chat_view.ex

@@ -14,13 +14,12 @@ defmodule Pleroma.Web.PleromaAPI.ChatView do
 
   def render("show.json", %{chat: %Chat{} = chat} = opts) do
     recipient = User.get_cached_by_ap_id(chat.recipient)
-
     last_message = opts[:last_message] || MessageReference.last_message_for_chat(chat)
 
     %{
       id: chat.id |> to_string(),
       account: AccountView.render("show.json", Map.put(opts, :user, recipient)),
-      unread: Map.get(chat, :unread) || MessageReference.unread_count_for_chat(chat),
+      unread: MessageReference.unread_count_for_chat(chat),
       last_message:
         last_message &&
           MessageReferenceView.render("show.json", chat_message_reference: last_message),