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Code Issues Projects Releases Wiki Activity

Avoid race conditions when creating backups (#10234)

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Under load, multiple backups for a single user could be planned, which
is very expensive.
This commit is contained in:
ThibG 2019-03-11 00:50:31 +01:00 committed by Eugen Rochko
parent 3a92885a86
commit 5506b9406d
1 changed files with 16 additions and 2 deletions
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18
app/controllers/settings/exports_controller.rb
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@ -13,11 +13,25 @@ class Settings::ExportsController < Settings::BaseController
end
def create
authorize :backup, :create?
raise Mastodon::NotPermittedError unless user_signed_in?
backup = nil
RedisLock.acquire(lock_options) do |lock|
if lock.acquired?
authorize :backup, :create?
backup = current_user.backups.create!
else
raise Mastodon::RaceConditionError
end
end
backup = current_user.backups.create!
BackupWorker.perform_async(backup.id)
redirect_to settings_export_path
end
def lock_options
{ redis: Redis.current, key: "backup:#{current_user.id}" }
end
end