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Fix threading of private posts received out of order

This commit is contained in:
Claire 2024-07-26 14:49:06 +02:00
parent 693d9b03ed
commit 52c56ed5a6
3 changed files with 54 additions and 0 deletions

View file

@ -88,6 +88,7 @@ class ActivityPub::Activity::Create < ActivityPub::Activity
end
resolve_thread(@status)
fixup_thread(@status)
fetch_replies(@status)
distribute
forward_for_reply
@ -334,6 +335,10 @@ class ActivityPub::Activity::Create < ActivityPub::Activity
ThreadResolveWorker.perform_async(status.id, in_reply_to_uri, { 'request_id' => @options[:request_id] })
end
def fixup_thread(status)
ThreadRepair.new(status.uri).reattach_orphaned_children!(status)
end
def fetch_replies(status)
collection = @object['replies']
return if collection.nil?

44
app/lib/thread_repair.rb Normal file
View file

@ -0,0 +1,44 @@
# frozen_string_literal: true
class ThreadRepair
include Redisable
THREAD_FIXUP_WINDOW = 1.hour.to_i
def initialize(parent_uri)
@parent_uri = parent_uri
end
def find_parent(child_id)
with_redis do |redis|
redis.sadd(redis_key, child_id)
redis.expire(redis_key, THREAD_FIXUP_WINDOW)
parent = ActivityPub::TagManager.instance.uri_to_resource(@parent_uri, Status)
redis.srem(redis_key, child_id) if parent.present?
parent
end
end
def reattach_orphaned_children!(parent)
with_redis do |redis|
redis.sscan_each(redis_key, count: 1000) do |ids|
statuses = Status.where(id: ids).to_a
statuses.each { |status| status.update(thread: parent) }
# Updated statuses need to be distributed to clients/inserted in TLs
DistributionWorker.push_bulk(statuses.filter(&:within_realtime_window?)) do |status|
[status.id, { 'skip_notifications' => true }]
end
redis.srem(redis_key, ids)
end
end
end
def redis_key
"thread_repair:#{@parent_uri}"
end
end

View file

@ -13,6 +13,11 @@ class ThreadResolveWorker
parent_status = ActivityPub::TagManager.instance.uri_to_resource(parent_url, Status)
parent_status ||= FetchRemoteStatusService.new.call(parent_url, **options.deep_symbolize_keys)
# The parent post does not exist or is private, so take note of it so the thread can be
# reconstructed if the parent arrives.
# This will re-check the database to avoid race conditions
parent_status ||= ThreadRepair.new(parent_url).find_parent(child_status_id)
return if parent_status.nil?
child_status.thread = parent_status