From 6cf57c676550068a59149ca82d63fcb5b5431158 Mon Sep 17 00:00:00 2001
From: Eugen Rochko <eugen@zeonfederated.com>
Date: Fri, 13 May 2022 00:02:35 +0200
Subject: Refactor how Redis locks are created (#18400)

* Refactor how Redis locks are created

* Fix autorelease duration on account deletion lock
---
 app/services/fetch_link_card_service.rb | 15 ++++-----------
 1 file changed, 4 insertions(+), 11 deletions(-)

(limited to 'app/services/fetch_link_card_service.rb')

diff --git a/app/services/fetch_link_card_service.rb b/app/services/fetch_link_card_service.rb
index 868796a6b..e5b5b730e 100644
--- a/app/services/fetch_link_card_service.rb
+++ b/app/services/fetch_link_card_service.rb
@@ -2,6 +2,7 @@
 
 class FetchLinkCardService < BaseService
   include Redisable
+  include Lockable
 
   URL_PATTERN = %r{
     (#{Twitter::TwitterText::Regex[:valid_url_preceding_chars]})                                                                #   $1 preceding chars
@@ -22,13 +23,9 @@ class FetchLinkCardService < BaseService
 
     @url = @original_url.to_s
 
-    RedisLock.acquire(lock_options) do |lock|
-      if lock.acquired?
-        @card = PreviewCard.find_by(url: @url)
-        process_url if @card.nil? || @card.updated_at <= 2.weeks.ago || @card.missing_image?
-      else
-        raise Mastodon::RaceConditionError
-      end
+    with_lock("fetch:#{@original_url}") do
+      @card = PreviewCard.find_by(url: @url)
+      process_url if @card.nil? || @card.updated_at <= 2.weeks.ago || @card.missing_image?
     end
 
     attach_card if @card&.persisted?
@@ -155,8 +152,4 @@ class FetchLinkCardService < BaseService
     @card.assign_attributes(link_details_extractor.to_preview_card_attributes)
     @card.save_with_optional_image! unless @card.title.blank? && @card.html.blank?
   end
-
-  def lock_options
-    { redis: redis, key: "fetch:#{@original_url}", autorelease: 15.minutes.seconds }
-  end
 end
-- 
cgit