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# frozen_string_literal: true
class BatchedRemoveStatusService < BaseService
include Redisable
# Delete multiple statuses and reblogs of them as efficiently as possible
# @param [Enumerable<Status>] statuses An array of statuses
# @param [Hash] options
# @option [Boolean] :skip_side_effects Do not modify feeds and send updates to streaming API
def call(statuses, **options)
ActiveRecord::Associations::Preloader.new.preload(statuses, options[:skip_side_effects] ? :reblogs : [:account, :tags, reblogs: :account])
statuses_and_reblogs = statuses.flat_map { |status| [status] + status.reblogs }
# The conversations for direct visibility statuses also need
# to be manually updated. This part is not efficient but we
# rely on direct visibility statuses being relatively rare.
statuses_with_account_conversations = statuses.select(&:direct_visibility?)
ActiveRecord::Associations::Preloader.new.preload(statuses_with_account_conversations, [mentions: :account])
statuses_with_account_conversations.each(&:unlink_from_conversations!)
# We do not batch all deletes into one to avoid having a long-running
# transaction lock the database, but we use the delete method instead
# of destroy to avoid all callbacks. We rely on foreign keys to
# cascade the delete faster without loading the associations.
statuses_and_reblogs.each_slice(50) { |slice| Status.where(id: slice.map(&:id)).delete_all }
# Since we skipped all callbacks, we also need to manually
# deindex the statuses
Chewy.strategy.current.update(StatusesIndex, statuses_and_reblogs) if Chewy.enabled?
return if options[:skip_side_effects]
# Batch by source account
statuses_and_reblogs.group_by(&:account_id).each_value do |account_statuses|
account = account_statuses.first.account
next unless account
unpush_from_home_timelines(account, account_statuses)
unpush_from_list_timelines(account, account_statuses)
end
# Cannot be batched
@status_id_cutoff = Mastodon::Snowflake.id_at(2.weeks.ago)
redis.pipelined do |pipeline|
statuses.each do |status|
unpush_from_public_timelines(status, pipeline)
end
end
end
private
def unpush_from_home_timelines(account, statuses)
account.followers_for_local_distribution.includes(:user).reorder(nil).find_each do |follower|
statuses.each do |status|
FeedManager.instance.unpush_from_home(follower, status)
end
end
end
def unpush_from_list_timelines(account, statuses)
account.lists_for_local_distribution.select(:id, :account_id).includes(account: :user).reorder(nil).find_each do |list|
statuses.each do |status|
FeedManager.instance.unpush_from_list(list, status)
end
end
end
def unpush_from_public_timelines(status, pipeline)
return unless status.public_visibility? && status.id > @status_id_cutoff
payload = Oj.dump(event: :delete, payload: status.id.to_s)
pipeline.publish('timeline:public', payload)
pipeline.publish(status.local? ? 'timeline:public:local' : 'timeline:public:remote', payload)
if status.media_attachments.any?
pipeline.publish('timeline:public:media', payload)
pipeline.publish(status.local? ? 'timeline:public:local:media' : 'timeline:public:remote:media', payload)
end
status.tags.map { |tag| tag.name.mb_chars.downcase }.each do |hashtag|
pipeline.publish("timeline:hashtag:#{hashtag}", payload)
pipeline.publish("timeline:hashtag:#{hashtag}:local", payload) if status.local?
end
end
end
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