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# frozen_string_literal: true
class BatchedRemoveStatusService < BaseService
include StreamEntryRenderer
# Delete given statuses and reblogs of them
# Dispatch PuSH updates of the deleted statuses, but only local ones
# Dispatch Salmon deletes, unique per domain, of the deleted statuses, but only local ones
# Remove statuses from home feeds
# Push delete events to streaming API for home feeds and public feeds
# @param [Status] statuses A preferably batched array of statuses
def call(statuses)
statuses = Status.where(id: statuses.map(&:id)).includes(:account, :stream_entry).flat_map { |status| [status] + status.reblogs.includes(:account, :stream_entry).to_a }
@mentions = statuses.map { |s| [s.id, s.mentions.includes(:account).to_a] }.to_h
@tags = statuses.map { |s| [s.id, s.tags.pluck(:name)] }.to_h
@stream_entry_batches = []
@salmon_batches = []
@activity_json_batches = []
@json_payloads = statuses.map { |s| [s.id, Oj.dump(event: :delete, payload: s.id)] }.to_h
@activity_json = {}
# Ensure that rendered XML reflects destroyed state
Status.where(id: statuses.map(&:id)).in_batches.destroy_all
# Batch by source account
statuses.group_by(&:account_id).each do |_, account_statuses|
account = account_statuses.first.account
unpush_from_home_timelines(account_statuses)
if account.local?
batch_stream_entries(account_statuses)
batch_activity_json(account, account_statuses)
end
end
# Cannot be batched
statuses.each do |status|
unpush_from_public_timelines(status)
batch_salmon_slaps(status) if status.local?
end
Pubsubhubbub::DistributionWorker.push_bulk(@stream_entry_batches) { |batch| batch }
NotificationWorker.push_bulk(@salmon_batches) { |batch| batch }
ActivityPub::DeliveryWorker.push_bulk(@activity_json_batches) { |batch| batch }
end
private
def batch_stream_entries(statuses)
stream_entry_ids = statuses.map { |s| s.stream_entry.id }
stream_entry_ids.each_slice(100) do |batch_of_stream_entry_ids|
@stream_entry_batches << [batch_of_stream_entry_ids]
end
end
def batch_activity_json(account, statuses)
account.followers.inboxes.each do |inbox_url|
statuses.each do |status|
@activity_json_batches << [build_json(status), account.id, inbox_url]
end
end
statuses.each do |status|
other_recipients = (status.mentions + status.reblogs).map(&:account).reject(&:local?).select(&:activitypub?).uniq(&:id)
other_recipients.each do |target_account|
@activity_json_batches << [build_json(status), account.id, target_account.inbox_url]
end
end
end
def unpush_from_home_timelines(statuses)
account = statuses.first.account
recipients = account.followers.local.pluck(:id)
recipients << account.id if account.local?
recipients.each do |follower_id|
unpush(follower_id, statuses)
end
end
def unpush_from_public_timelines(status)
payload = @json_payloads[status.id]
redis.pipelined do
redis.publish('timeline:public', payload)
redis.publish('timeline:public:local', payload) if status.local?
@tags[status.id].each do |hashtag|
redis.publish("timeline:hashtag:#{hashtag}", payload)
redis.publish("timeline:hashtag:#{hashtag}:local", payload) if status.local?
end
end
end
def batch_salmon_slaps(status)
return if @mentions[status.id].empty?
payload = stream_entry_to_xml(status.stream_entry.reload)
recipients = @mentions[status.id].map(&:account).reject(&:local?).select(&:ostatus?).uniq(&:domain).map(&:id)
recipients.each do |recipient_id|
@salmon_batches << [payload, status.account_id, recipient_id]
end
end
def unpush(follower_id, statuses)
key = FeedManager.instance.key(:home, follower_id)
originals = statuses.reject(&:reblog?)
reblogs = statuses.select(&:reblog?)
# Quickly remove all originals
redis.pipelined do
originals.each do |status|
redis.zremrangebyscore(key, status.id, status.id)
redis.publish("timeline:#{follower_id}", @json_payloads[status.id])
end
end
# For reblogs, re-add original status to feed, unless the reblog
# was not in the feed in the first place
reblogs.each do |status|
redis.zadd(key, status.reblog_of_id, status.reblog_of_id) unless redis.zscore(key, status.reblog_of_id).nil?
redis.publish("timeline:#{follower_id}", @json_payloads[status.id])
end
end
def redis
Redis.current
end
def build_json(status)
return @activity_json[status.id] if @activity_json.key?(status.id)
@activity_json[status.id] = sign_json(status, ActiveModelSerializers::SerializableResource.new(
status,
serializer: status.reblog? ? ActivityPub::UndoAnnounceSerializer : ActivityPub::DeleteSerializer,
adapter: ActivityPub::Adapter
).as_json)
end
def sign_json(status, json)
Oj.dump(ActivityPub::LinkedDataSignature.new(json).sign!(status.account))
end
end
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