From ce8f33dd2f0fddf4bb30cbcdece8ed102838a0fb Mon Sep 17 00:00:00 2001
From: Eugen Rochko <eugen@zeonfederated.com>
Date: Sun, 30 Aug 2020 12:33:59 +0200
Subject: [PATCH] Fix inefficiencies in fan-out-on-write service (#14682)

---
 app/services/fan_out_on_write_service.rb | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/app/services/fan_out_on_write_service.rb b/app/services/fan_out_on_write_service.rb
index 276eac0c1..21931c2f1 100644
--- a/app/services/fan_out_on_write_service.rb
+++ b/app/services/fan_out_on_write_service.rb
@@ -6,8 +6,6 @@ class FanOutOnWriteService < BaseService
   def call(status)
     raise Mastodon::RaceConditionError if status.visibility.nil?
 
-    render_anonymous_payload(status)
-
     if status.direct_visibility?
       deliver_to_own_conversation(status)
     elsif status.limited_visibility?
@@ -20,6 +18,8 @@ class FanOutOnWriteService < BaseService
 
     return if status.account.silenced? || !status.public_visibility? || status.reblog?
 
+    render_anonymous_payload(status)
+
     deliver_to_hashtags(status)
 
     return if status.reply? && status.in_reply_to_account_id != status.account_id
@@ -58,8 +58,10 @@ class FanOutOnWriteService < BaseService
   def deliver_to_mentioned_followers(status)
     Rails.logger.debug "Delivering status #{status.id} to limited followers"
 
-    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]
+    status.mentions.joins(:account).merge(status.account.followers_for_local_distribution).select(:id).reorder(nil).find_in_batches do |followers|
+      FeedInsertWorker.push_bulk(followers) do |follower|
+        [status.id, follower.id, :home]
+      end
     end
   end