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271 lines
10 KiB
Ruby
271 lines
10 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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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 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)
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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(timeline_type, account, status)
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return false unless add_to_feed(timeline_type, account, status)
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trim(timeline_type, account.id)
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PushUpdateWorker.perform_async(account.id, status.id) if push_update_required?(timeline_type, account.id)
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true
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end
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def unpush(timeline_type, account, status)
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return false unless remove_from_feed(timeline_type, account, status)
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payload = Oj.dump(event: :delete, payload: status.id.to_s)
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Redis.current.publish("timeline:#{account.id}", payload)
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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)).to_s)
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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 push_update_required?(timeline_type, account_id)
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timeline_type != :home || redis.get("subscribed:timeline:#{account_id}").present?
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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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query = from_account.statuses.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 || 0
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query = query.where('id > ?', oldest_home_score)
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end
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query.each do |status|
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next if status.direct_visibility? || filter?(:home, status, into_account)
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add_to_feed(:home, into_account, status)
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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, status)
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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(: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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added = 0
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limit = FeedManager::MAX_ITEMS / 2
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max_id = nil
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loop do
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statuses = Status.as_home_timeline(account)
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.paginate_by_max_id(limit, max_id)
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break if statuses.empty?
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statuses.each do |status|
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next if filter_from_home?(status, account)
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added += 1 if add_to_feed(:home, account, status)
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end
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break unless added.zero?
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max_id = statuses.last.id
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end
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end
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private
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def redis
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Redis.current
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end
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def filter_from_home?(status, receiver_id)
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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 keyword_filter?(status, Glitch::KeywordMute.matcher_for(receiver_id))
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check_for_mutes = [status.account_id]
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check_for_mutes.concat(status.mentions.pluck(:account_id))
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check_for_mutes.concat([status.reblog.account_id]) if status.reblog?
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return true if Mute.where(account_id: receiver_id, target_account_id: check_for_mutes).any?
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check_for_blocks = status.mentions.pluck(:account_id)
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check_for_blocks.concat([status.reblog.account_id]) if status.reblog?
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return true if Block.where(account_id: receiver_id, target_account_id: check_for_blocks).any?
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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 = !Follow.where(account_id: receiver_id, target_account_id: status.in_reply_to_account_id).exists? # 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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src_id = status.account_id
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should_filter = Follow.where(account_id: receiver_id, target_account_id: src_id, show_reblogs: false).exists? # if the reblogger's reblogs are suppressed
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should_filter ||= Block.where(account_id: status.reblog.account_id, target_account_id: receiver_id).exists? # or if the author of the reblogged status is blocking me
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should_filter ||= AccountDomainBlock.where(account_id: receiver_id, domain: status.reblog.account.domain).exists? # 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 keyword_filter?(status, matcher)
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should_filter = matcher =~ status.text
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should_filter ||= matcher =~ status.spoiler_text
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if status.reblog?
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should_filter ||= matcher =~ status.reblog.text
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should_filter ||= matcher =~ status.reblog.spoiler_text
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end
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!!should_filter
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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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check_for_blocks = [status.account_id]
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check_for_blocks.concat(status.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 = Block.where(account_id: receiver_id, target_account_id: check_for_blocks).any? # Filter if it's from someone I blocked, in reply to someone I blocked, or mentioning someone I blocked
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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 ||= keyword_filter?(status, Glitch::KeywordMute.matcher_for(receiver_id)) # or if the mention contains a muted keyword
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should_filter
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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, status)
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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?
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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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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, status)
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timeline_key = key(timeline_type, account.id)
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if status.reblog?
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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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# 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).sort.first
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redis.zadd(timeline_key, other_reblog, other_reblog) 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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end
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redis.zrem(timeline_key, status.id)
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end
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end
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