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Fix processing of remote Delete activities (#16084)

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* Add tests

* Ensure deleted statuses are marked as such

* Save some redis memory by not storing URIs in delete_upon_arrival values

* Avoid possible race condition when processing incoming Deletes

* Avoid potential duplicate Delete forwards

* Lower lock durations to reduce issues in case of hard crash of the Rails process

* Check for `lock.aquired?` and improve comment

* Refactor RedisLock usage in app/lib/activitypub

* Fix using incorrect or non-existent sender for relaying Deletes
This commit is contained in:
Claire 2021-04-21 04:46:09 +02:00 • committed by GitHub
parent 2c322addf3
commit 0b36e3419d
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6 changed files with 94 additions and 82 deletions
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14
app/lib/activitypub/activity.rb
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@ -144,7 +144,7 @@ class ActivityPub::Activity
end
def delete_later!(uri)
redis.setex("delete_upon_arrival:#{@account.id}:#{uri}", 6.hours.seconds, uri)
redis.setex("delete_upon_arrival:#{@account.id}:#{uri}", 6.hours.seconds, true)
end
def status_from_object
@ -210,12 +210,22 @@ class ActivityPub::Activity
end
end
def lock_or_return(key, expire_after = 7.days.seconds)
def lock_or_return(key, expire_after = 2.hours.seconds)
yield if redis.set(key, true, nx: true, ex: expire_after)
ensure
redis.del(key)
end
def lock_or_fail(key)
RedisLock.acquire({ redis: Redis.current, key: key }) do |lock|
if lock.acquired?
yield
else
raise Mastodon::RaceConditionError
end
end
end
def fetch?
!@options[:delivery]
end