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Refactor how Redis locks are created (#18400)

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* Refactor how Redis locks are created

* Fix autorelease duration on account deletion lock
This commit is contained in:
Eugen Rochko 2022-05-13 00:02:35 +02:00 • committed by GitHub
parent 12535568f7
commit 6cf57c6765
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16 changed files with 112 additions and 179 deletions
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15
app/services/fetch_link_card_service.rb
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@ -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