Accept the same payload in multiple inboxes and deliver (mastodon#9150)

app/lib/activitypub/activity/create.rb

@@ -10,7 +10,12 @@ def perform
     RedisLock.acquire(lock_options) do |lock|
       if lock.acquired?
         @status = find_existing_status
-        process_status if @status.nil?
+
+        if @status.nil?
+          process_status
+        elsif @options[:delivered_to_account_id].present?
+          postprocess_audience_and_deliver
+        end
       else
         raise Mastodon::RaceConditionError
       end
@@ -99,6 +104,19 @@ def process_audience
     @params[:visibility] = :limited
   end
 
+  def postprocess_audience_and_deliver
+    return if @status.mentions.find_by(account_id: @options[:delivered_to_account_id])
+
+    delivered_to_account = Account.find(@options[:delivered_to_account_id])
+
+    @status.mentions.create(account: delivered_to_account, silent: true)
+    @status.update(visibility: :limited) if @status.direct_visibility?
+
+    return unless delivered_to_account.following?(@account)
+
+    FeedInsertWorker.perform_async(@status.id, delivered_to_account.id, :home)
+  end
+
   def attach_tags(status)
     @tags.each do |tag|
       status.tags << tag

app/services/fan_out_on_write_service.rb

@@ -58,10 +58,8 @@ def deliver_to_lists(status)
   def deliver_to_mentioned_followers(status)
     Rails.logger.debug "Delivering status #{status.id} to limited followers"
 
-    status.mentions.includes(:account).each do |mention|
-      mentioned_account = mention.account
-      next if !mentioned_account.local? || !mentioned_account.following?(status.account) || FeedManager.instance.filter?(:home, status, mention.account_id)
-      FeedManager.instance.push_to_home(mentioned_account, status)
+    FeedInsertWorker.push_bulk(status.mentions.includes(:account).map(&:account).select { |mentioned_account| mentioned_account.local? && mentioned_account.following?(status.account) }) do |follower|
+      [status.id, follower.id, :home]
     end
   end