Avoid race condition when streaming deleted statuses (#10280)

* Avoid race condition when streaming deleted statuses

* Move redis lock to DistributionWorker to avoid extra Redis value
main
ThibG 6 years ago committed by Eugen Rochko
parent db06b25376
commit 6b0eda14a1

@ -14,16 +14,22 @@ class RemoveStatusService < BaseService
@stream_entry = status.stream_entry
@options = options
remove_from_self if status.account.local?
remove_from_followers
remove_from_lists
remove_from_affected
remove_reblogs
remove_from_hashtags
remove_from_public
remove_from_media if status.media_attachments.any?
@status.destroy!
RedisLock.acquire(lock_options) do |lock|
if lock.acquired?
remove_from_self if status.account.local?
remove_from_followers
remove_from_lists
remove_from_affected
remove_reblogs
remove_from_hashtags
remove_from_public
remove_from_media if status.media_attachments.any?
@status.destroy!
else
raise Mastodon::RaceConditionError
end
end
# There is no reason to send out Undo activities when the
# cause is that the original object has been removed, since
@ -156,4 +162,8 @@ class RemoveStatusService < BaseService
redis.publish('timeline:public:media', @payload)
redis.publish('timeline:public:local:media', @payload) if @status.local?
end
def lock_options
{ redis: Redis.current, key: "distribute:#{@status.id}" }
end
end

@ -4,7 +4,13 @@ class DistributionWorker
include Sidekiq::Worker
def perform(status_id)
FanOutOnWriteService.new.call(Status.find(status_id))
RedisLock.acquire(redis: Redis.current, key: "distribute:#{status_id}") do |lock|
if lock.acquired?
FanOutOnWriteService.new.call(Status.find(status_id))
else
raise Mastodon::RaceConditionError
end
end
rescue ActiveRecord::RecordNotFound
true
end

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