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# frozen_string_literal: true
# == Schema Information
#
# Table name: account_statuses_cleanup_policies
#
# id :bigint not null, primary key
# account_id :bigint not null
# enabled :boolean default(TRUE), not null
# min_status_age :integer default(1209600), not null
# keep_direct :boolean default(TRUE), not null
# keep_pinned :boolean default(TRUE), not null
# keep_polls :boolean default(FALSE), not null
# keep_media :boolean default(FALSE), not null
# keep_self_fav :boolean default(TRUE), not null
# keep_self_bookmark :boolean default(TRUE), not null
# min_favs :integer
# min_reblogs :integer
# created_at :datetime not null
# updated_at :datetime not null
#
class AccountStatusesCleanupPolicy < ApplicationRecord
include Redisable
ALLOWED_MIN_STATUS_AGE = [
2.weeks.seconds,
1.month.seconds,
2.months.seconds,
3.months.seconds,
6.months.seconds,
1.year.seconds,
2.years.seconds,
].freeze
EXCEPTION_BOOLS = %w(keep_direct keep_pinned keep_polls keep_media keep_self_fav keep_self_bookmark).freeze
EXCEPTION_THRESHOLDS = %w(min_favs min_reblogs).freeze
# Depending on the cleanup policy, the query to discover the next
# statuses to delete my get expensive if the account has a lot of old
# statuses otherwise excluded from deletion by the other exceptions.
#
# Therefore, `EARLY_SEARCH_CUTOFF` is meant to be the maximum number of
# old statuses to be considered for deletion prior to checking exceptions.
#
# This is used in `compute_cutoff_id` to provide a `max_id` to
# `statuses_to_delete`.
EARLY_SEARCH_CUTOFF = 5_000
belongs_to :account
validates :min_status_age, inclusion: { in: ALLOWED_MIN_STATUS_AGE }
validates :min_favs, numericality: { greater_than_or_equal_to: 1, allow_nil: true }
validates :min_reblogs, numericality: { greater_than_or_equal_to: 1, allow_nil: true }
validate :validate_local_account
before_save :update_last_inspected
def statuses_to_delete(limit = 50, max_id = nil, min_id = nil)
scope = account.statuses
scope.merge!(old_enough_scope(max_id))
scope = scope.where(Status.arel_table[:id].gteq(min_id)) if min_id.present?
scope.merge!(without_popular_scope) unless min_favs.nil? && min_reblogs.nil?
scope.merge!(without_direct_scope) if keep_direct?
scope.merge!(without_pinned_scope) if keep_pinned?
scope.merge!(without_poll_scope) if keep_polls?
scope.merge!(without_media_scope) if keep_media?
scope.merge!(without_self_fav_scope) if keep_self_fav?
scope.merge!(without_self_bookmark_scope) if keep_self_bookmark?
scope.reorder(id: :asc).limit(limit)
end
# This computes a toot id such that:
# - the toot would be old enough to be candidate for deletion
# - there are at most EARLY_SEARCH_CUTOFF toots between the last inspected toot and this one
#
# The idea is to limit expensive SQL queries when an account has lots of toots excluded from
# deletion, while not starting anew on each run.
def compute_cutoff_id
min_id = last_inspected || 0
max_id = Mastodon::Snowflake.id_at(min_status_age.seconds.ago, with_random: false)
subquery = account.statuses.where(Status.arel_table[:id].gteq(min_id)).where(Status.arel_table[:id].lteq(max_id))
subquery = subquery.select(:id).reorder(id: :asc).limit(EARLY_SEARCH_CUTOFF)
# We're textually interpolating a subquery here as ActiveRecord seem to not provide
# a way to apply the limit to the subquery
Status.connection.execute("SELECT MAX(id) FROM (#{subquery.to_sql}) t").values.first.first
end
# The most important thing about `last_inspected` is that any toot older than it is guaranteed
# not to be kept by the policy regardless of its age.
def record_last_inspected(last_id)
redis.set("account_cleanup:#{account.id}", last_id, ex: 1.week.seconds)
end
def last_inspected
redis.get("account_cleanup:#{account.id}")&.to_i
end
def invalidate_last_inspected(status, action)
last_value = last_inspected
return if last_value.nil? || status.id > last_value || status.account_id != account_id
case action
when :unbookmark
return unless keep_self_bookmark?
when :unfav
return unless keep_self_fav?
when :unpin
return unless keep_pinned?
end
record_last_inspected(status.id)
end
private
def update_last_inspected
if EXCEPTION_BOOLS.map { |name| attribute_change_to_be_saved(name) }.compact.include?([true, false])
# Policy has been widened in such a way that any previously-inspected status
# may need to be deleted, so we'll have to start again.
redis.del("account_cleanup:#{account.id}")
end
if EXCEPTION_THRESHOLDS.map { |name| attribute_change_to_be_saved(name) }.compact.any? { |old, new| old.present? && (new.nil? || new > old) }
redis.del("account_cleanup:#{account.id}")
end
end
def validate_local_account
errors.add(:account, :invalid) unless account&.local?
end
def without_direct_scope
Status.where.not(visibility: :direct)
end
def old_enough_scope(max_id = nil)
# Filtering on `id` rather than `min_status_age` ago will treat
# non-snowflake statuses as older than they really are, but Mastodon
# has switched to snowflake IDs significantly over 2 years ago anyway.
max_id = [max_id, Mastodon::Snowflake.id_at(min_status_age.seconds.ago, with_random: false)].compact.min
Status.where(Status.arel_table[:id].lteq(max_id))
end
def without_self_fav_scope
Status.where('NOT EXISTS (SELECT * FROM favourites fav WHERE fav.account_id = statuses.account_id AND fav.status_id = statuses.id)')
end
def without_self_bookmark_scope
Status.where('NOT EXISTS (SELECT * FROM bookmarks bookmark WHERE bookmark.account_id = statuses.account_id AND bookmark.status_id = statuses.id)')
end
def without_pinned_scope
Status.where('NOT EXISTS (SELECT * FROM status_pins pin WHERE pin.account_id = statuses.account_id AND pin.status_id = statuses.id)')
end
def without_media_scope
Status.where('NOT EXISTS (SELECT * FROM media_attachments media WHERE media.status_id = statuses.id)')
end
def without_poll_scope
Status.where(poll_id: nil)
end
def without_popular_scope
scope = Status.left_joins(:status_stat)
scope = scope.where('COALESCE(status_stats.reblogs_count, 0) < ?', min_reblogs) unless min_reblogs.nil?
scope = scope.where('COALESCE(status_stats.favourites_count, 0) < ?', min_favs) unless min_favs.nil?
scope
end
end
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