forked from fedi/mastodon
371 lines
16 KiB
Ruby
371 lines
16 KiB
Ruby
# frozen_string_literal: true
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require 'singleton'
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class FeedManager
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include Singleton
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include Redisable
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MAX_ITEMS = 400
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# Must be <= MAX_ITEMS or the tracking sets will grow forever
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REBLOG_FALLOFF = 40
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def with_active_accounts(&block)
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Account.joins(:user).where('users.current_sign_in_at > ?', User::ACTIVE_DURATION.ago).find_each(&block)
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end
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def key(type, id, subtype = nil)
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return "feed:#{type}:#{id}" unless subtype
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"feed:#{type}:#{id}:#{subtype}"
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end
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def filter?(timeline_type, status, receiver_id)
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if timeline_type == :home
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filter_from_home?(status, receiver_id, build_crutches(receiver_id, [status]))
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elsif timeline_type == :mentions
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filter_from_mentions?(status, receiver_id)
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else
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false
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end
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end
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def push_to_home(account, status)
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return false unless add_to_feed(:home, account.id, status, account.user&.aggregates_reblogs?)
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trim(:home, account.id)
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PushUpdateWorker.perform_async(account.id, status.id, "timeline:#{account.id}") if push_update_required?("timeline:#{account.id}")
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true
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end
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def unpush_from_home(account, status)
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return false unless remove_from_feed(:home, account.id, status, account.user&.aggregates_reblogs?)
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redis.publish("timeline:#{account.id}", Oj.dump(event: :delete, payload: status.id.to_s))
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true
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end
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def push_to_list(list, status)
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if status.reply? && status.in_reply_to_account_id != status.account_id
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should_filter = status.in_reply_to_account_id != list.account_id
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should_filter &&= !ListAccount.where(list_id: list.id, account_id: status.in_reply_to_account_id).exists?
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return false if should_filter
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end
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return false unless add_to_feed(:list, list.id, status, list.account.user&.aggregates_reblogs?)
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trim(:list, list.id)
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PushUpdateWorker.perform_async(list.account_id, status.id, "timeline:list:#{list.id}") if push_update_required?("timeline:list:#{list.id}")
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true
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end
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def unpush_from_list(list, status)
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return false unless remove_from_feed(:list, list.id, status, list.account.user&.aggregates_reblogs?)
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redis.publish("timeline:list:#{list.id}", Oj.dump(event: :delete, payload: status.id.to_s))
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true
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end
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def trim(type, account_id)
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timeline_key = key(type, account_id)
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reblog_key = key(type, account_id, 'reblogs')
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# Remove any items past the MAX_ITEMS'th entry in our feed
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redis.zremrangebyrank(timeline_key, 0, -(FeedManager::MAX_ITEMS + 1))
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# Get the score of the REBLOG_FALLOFF'th item in our feed, and stop
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# tracking anything after it for deduplication purposes.
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falloff_rank = FeedManager::REBLOG_FALLOFF - 1
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falloff_range = redis.zrevrange(timeline_key, falloff_rank, falloff_rank, with_scores: true)
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falloff_score = falloff_range&.first&.last&.to_i || 0
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# Get any reblogs we might have to clean up after.
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redis.zrangebyscore(reblog_key, 0, falloff_score).each do |reblogged_id|
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# Remove it from the set of reblogs we're tracking *first* to avoid races.
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redis.zrem(reblog_key, reblogged_id)
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# Just drop any set we might have created to track additional reblogs.
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# This means that if this reblog is deleted, we won't automatically insert
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# another reblog, but also that any new reblog can be inserted into the
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# feed.
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redis.del(key(type, account_id, "reblogs:#{reblogged_id}"))
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end
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end
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def merge_into_timeline(from_account, into_account)
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timeline_key = key(:home, into_account.id)
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aggregate = into_account.user&.aggregates_reblogs?
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query = from_account.statuses.where(visibility: [:public, :unlisted, :private]).includes(:preloadable_poll, reblog: :account).limit(FeedManager::MAX_ITEMS / 4)
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if redis.zcard(timeline_key) >= FeedManager::MAX_ITEMS / 4
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oldest_home_score = redis.zrange(timeline_key, 0, 0, with_scores: true).first.last.to_i
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query = query.where('id > ?', oldest_home_score)
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end
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statuses = query.to_a
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crutches = build_crutches(into_account.id, statuses)
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statuses.each do |status|
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next if filter_from_home?(status, into_account.id, crutches)
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add_to_feed(:home, into_account.id, status, aggregate)
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end
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trim(:home, into_account.id)
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end
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def unmerge_from_timeline(from_account, into_account)
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timeline_key = key(:home, into_account.id)
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oldest_home_score = redis.zrange(timeline_key, 0, 0, with_scores: true)&.first&.last&.to_i || 0
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from_account.statuses.select('id, reblog_of_id').where('id > ?', oldest_home_score).reorder(nil).find_each do |status|
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remove_from_feed(:home, into_account.id, status, into_account.user&.aggregates_reblogs?)
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end
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end
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def clear_from_timeline(account, target_account)
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timeline_key = key(:home, account.id)
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timeline_status_ids = redis.zrange(timeline_key, 0, -1)
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target_statuses = Status.where(id: timeline_status_ids, account: target_account)
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target_statuses.each do |status|
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unpush_from_home(account, status)
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end
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end
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def populate_feed(account)
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limit = FeedManager::MAX_ITEMS / 2
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aggregate = account.user&.aggregates_reblogs?
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timeline_key = key(:home, account.id)
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account.statuses.where.not(visibility: :direct).limit(limit).each do |status|
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add_to_feed(:home, account.id, status, aggregate)
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end
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account.following.includes(:account_stat).find_each do |target_account|
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if redis.zcard(timeline_key) >= limit
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oldest_home_score = redis.zrange(timeline_key, 0, 0, with_scores: true).first.last.to_i
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last_status_score = Mastodon::Snowflake.id_at(account.last_status_at)
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# If the feed is full and this account has not posted more recently
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# than the last item on the feed, then we can skip the whole account
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# because none of its statuses would stay on the feed anyway
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next if last_status_score < oldest_home_score
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end
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statuses = target_account.statuses.where(visibility: [:public, :unlisted, :private]).includes(:preloadable_poll, reblog: :account).limit(limit)
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crutches = build_crutches(account.id, statuses)
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statuses.each do |status|
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next if filter_from_home?(status, account.id, crutches)
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add_to_feed(:home, account.id, status, aggregate)
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end
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trim(:home, account.id)
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end
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end
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private
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def push_update_required?(timeline_id)
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redis.exists("subscribed:#{timeline_id}")
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end
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def blocks_or_mutes?(receiver_id, account_ids, context)
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Block.where(account_id: receiver_id, target_account_id: account_ids).any? ||
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(context == :home ? Mute.where(account_id: receiver_id, target_account_id: account_ids).any? : Mute.where(account_id: receiver_id, target_account_id: account_ids, hide_notifications: true).any?)
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end
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def filter_from_home?(status, receiver_id, crutches)
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return false if receiver_id == status.account_id
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return true if status.reply? && (status.in_reply_to_id.nil? || status.in_reply_to_account_id.nil?)
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return true if phrase_filtered?(status, receiver_id, :home)
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check_for_blocks = crutches[:active_mentions][status.id] || []
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check_for_blocks.concat([status.account_id])
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if status.reblog?
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check_for_blocks.concat([status.reblog.account_id])
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check_for_blocks.concat(crutches[:active_mentions][status.reblog_of_id] || [])
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end
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return true if check_for_blocks.any? { |target_account_id| crutches[:blocking][target_account_id] || crutches[:muting][target_account_id] }
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if status.reply? && !status.in_reply_to_account_id.nil? # Filter out if it's a reply
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should_filter = !crutches[:following][status.in_reply_to_account_id] # and I'm not following the person it's a reply to
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should_filter &&= receiver_id != status.in_reply_to_account_id # and it's not a reply to me
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should_filter &&= status.account_id != status.in_reply_to_account_id # and it's not a self-reply
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return !!should_filter
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elsif status.reblog? # Filter out a reblog
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should_filter = crutches[:hiding_reblogs][status.account_id] # if the reblogger's reblogs are suppressed
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should_filter ||= crutches[:blocked_by][status.reblog.account_id] # or if the author of the reblogged status is blocking me
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should_filter ||= crutches[:domain_blocking][status.reblog.account.domain] # or the author's domain is blocked
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return !!should_filter
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end
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false
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end
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def filter_from_mentions?(status, receiver_id)
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return true if receiver_id == status.account_id
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return true if phrase_filtered?(status, receiver_id, :notifications)
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# This filter is called from NotifyService, but already after the sender of
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# the notification has been checked for mute/block. Therefore, it's not
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# necessary to check the author of the toot for mute/block again
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check_for_blocks = status.active_mentions.pluck(:account_id)
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check_for_blocks.concat([status.in_reply_to_account]) if status.reply? && !status.in_reply_to_account_id.nil?
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should_filter = blocks_or_mutes?(receiver_id, check_for_blocks, :mentions) # Filter if it's from someone I blocked, in reply to someone I blocked, or mentioning someone I blocked (or muted)
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should_filter ||= (status.account.silenced? && !Follow.where(account_id: receiver_id, target_account_id: status.account_id).exists?) # of if the account is silenced and I'm not following them
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should_filter
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end
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def phrase_filtered?(status, receiver_id, context)
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active_filters = Rails.cache.fetch("filters:#{receiver_id}") { CustomFilter.where(account_id: receiver_id).active_irreversible.to_a }.to_a
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active_filters.select! { |filter| filter.context.include?(context.to_s) && !filter.expired? }
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active_filters.map! do |filter|
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if filter.whole_word
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sb = filter.phrase =~ /\A[[:word:]]/ ? '\b' : ''
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eb = filter.phrase =~ /[[:word:]]\z/ ? '\b' : ''
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/(?mix:#{sb}#{Regexp.escape(filter.phrase)}#{eb})/
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else
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/#{Regexp.escape(filter.phrase)}/i
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end
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end
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return false if active_filters.empty?
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combined_regex = active_filters.reduce { |memo, obj| Regexp.union(memo, obj) }
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status = status.reblog if status.reblog?
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combined_text = [
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Formatter.instance.plaintext(status),
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status.spoiler_text,
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status.preloadable_poll ? status.preloadable_poll.options.join("\n\n") : nil,
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status.media_attachments.map(&:description).join("\n\n"),
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].compact.join("\n\n")
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!combined_regex.match(combined_text).nil?
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end
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# Adds a status to an account's feed, returning true if a status was
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# added, and false if it was not added to the feed. Note that this is
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# an internal helper: callers must call trim or push updates if
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# either action is appropriate.
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def add_to_feed(timeline_type, account_id, status, aggregate_reblogs = true)
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timeline_key = key(timeline_type, account_id)
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reblog_key = key(timeline_type, account_id, 'reblogs')
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if status.reblog? && (aggregate_reblogs.nil? || aggregate_reblogs)
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# If the original status or a reblog of it is within
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# REBLOG_FALLOFF statuses from the top, do not re-insert it into
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# the feed
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rank = redis.zrevrank(timeline_key, status.reblog_of_id)
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return false if !rank.nil? && rank < FeedManager::REBLOG_FALLOFF
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reblog_rank = redis.zrevrank(reblog_key, status.reblog_of_id)
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if reblog_rank.nil?
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# This is not something we've already seen reblogged, so we
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# can just add it to the feed (and note that we're
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# reblogging it).
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redis.zadd(timeline_key, status.id, status.id)
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redis.zadd(reblog_key, status.id, status.reblog_of_id)
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else
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# Another reblog of the same status was already in the
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# REBLOG_FALLOFF most recent statuses, so we note that this
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# is an "extra" reblog, by storing it in reblog_set_key.
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reblog_set_key = key(timeline_type, account_id, "reblogs:#{status.reblog_of_id}")
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redis.sadd(reblog_set_key, status.id)
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return false
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end
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else
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# A reblog may reach earlier than the original status because of the
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# delay of the worker deliverying the original status, the late addition
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# by merging timelines, and other reasons.
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# If such a reblog already exists, just do not re-insert it into the feed.
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rank = redis.zrevrank(reblog_key, status.id)
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return false unless rank.nil?
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redis.zadd(timeline_key, status.id, status.id)
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end
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true
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end
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# Removes an individual status from a feed, correctly handling cases
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# with reblogs, and returning true if a status was removed. As with
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# `add_to_feed`, this does not trigger push updates, so callers must
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# do so if appropriate.
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def remove_from_feed(timeline_type, account_id, status, aggregate_reblogs = true)
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timeline_key = key(timeline_type, account_id)
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reblog_key = key(timeline_type, account_id, 'reblogs')
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if status.reblog? && (aggregate_reblogs.nil? || aggregate_reblogs)
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# 1. If the reblogging status is not in the feed, stop.
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status_rank = redis.zrevrank(timeline_key, status.id)
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return false if status_rank.nil?
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# 2. Remove reblog from set of this status's reblogs.
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reblog_set_key = key(timeline_type, account_id, "reblogs:#{status.reblog_of_id}")
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redis.srem(reblog_set_key, status.id)
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redis.zrem(reblog_key, status.reblog_of_id)
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# 3. Re-insert another reblog or original into the feed if one
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# remains in the set. We could pick a random element, but this
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# set should generally be small, and it seems ideal to show the
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# oldest potential such reblog.
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other_reblog = redis.smembers(reblog_set_key).map(&:to_i).min
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redis.zadd(timeline_key, other_reblog, other_reblog) if other_reblog
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redis.zadd(reblog_key, other_reblog, status.reblog_of_id) if other_reblog
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# 4. Remove the reblogging status from the feed (as normal)
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# (outside conditional)
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else
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# If the original is getting deleted, no use for reblog references
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redis.del(key(timeline_type, account_id, "reblogs:#{status.id}"))
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redis.zrem(reblog_key, status.id)
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end
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redis.zrem(timeline_key, status.id)
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end
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def build_crutches(receiver_id, statuses)
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crutches = {}
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crutches[:active_mentions] = Mention.active.where(status_id: statuses.flat_map { |s| [s.id, s.reblog_of_id] }.compact).pluck(:status_id, :account_id).each_with_object({}) { |(id, account_id), mapping| (mapping[id] ||= []).push(account_id) }
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check_for_blocks = statuses.flat_map do |s|
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arr = crutches[:active_mentions][s.id] || []
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arr.concat([s.account_id])
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if s.reblog?
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arr.concat([s.reblog.account_id])
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arr.concat(crutches[:active_mentions][s.reblog_of_id] || [])
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end
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arr
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end
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crutches[:following] = Follow.where(account_id: receiver_id, target_account_id: statuses.map(&:in_reply_to_account_id).compact).pluck(:target_account_id).each_with_object({}) { |id, mapping| mapping[id] = true }
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crutches[:hiding_reblogs] = Follow.where(account_id: receiver_id, target_account_id: statuses.map { |s| s.account_id if s.reblog? }.compact, show_reblogs: false).pluck(:target_account_id).each_with_object({}) { |id, mapping| mapping[id] = true }
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crutches[:blocking] = Block.where(account_id: receiver_id, target_account_id: check_for_blocks).pluck(:target_account_id).each_with_object({}) { |id, mapping| mapping[id] = true }
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crutches[:muting] = Mute.where(account_id: receiver_id, target_account_id: check_for_blocks).pluck(:target_account_id).each_with_object({}) { |id, mapping| mapping[id] = true }
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crutches[:domain_blocking] = AccountDomainBlock.where(account_id: receiver_id, domain: statuses.map { |s| s.reblog&.account&.domain }.compact).pluck(:domain).each_with_object({}) { |domain, mapping| mapping[domain] = true }
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crutches[:blocked_by] = Block.where(target_account_id: receiver_id, account_id: statuses.map { |s| s.reblog&.account_id }.compact).pluck(:account_id).each_with_object({}) { |id, mapping| mapping[id] = true }
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crutches
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end
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end
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