125 lines
4.0 KiB
Ruby
125 lines
4.0 KiB
Ruby
# frozen_string_literal: true
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class TrendingTags
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KEY = 'trending_tags'
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EXPIRE_HISTORY_AFTER = 7.days.seconds
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EXPIRE_TRENDS_AFTER = 1.day.seconds
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THRESHOLD = 5
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LIMIT = 10
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REVIEW_THRESHOLD = 3
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MAX_SCORE_COOLDOWN = 2.days.freeze
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MAX_SCORE_HALFLIFE = 2.hours.freeze
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class << self
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include Redisable
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def record_use!(tag, account, at_time = Time.now.utc)
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return if account.silenced? || account.bot? || !tag.usable? || !(tag.trendable? || tag.requires_review?)
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increment_historical_use!(tag.id, at_time)
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increment_unique_use!(tag.id, account.id, at_time)
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increment_use!(tag.id, at_time)
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tag.update(last_status_at: Time.now.utc) if tag.last_status_at.nil? || tag.last_status_at < 12.hours.ago
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end
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def update!(at_time = Time.now.utc)
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tag_ids = redis.smembers("#{KEY}:used:#{at_time.beginning_of_day.to_i}") + redis.zrange(KEY, 0, -1)
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tags = Tag.where(id: tag_ids.uniq)
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# First pass to calculate scores and update the set
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tags.each do |tag|
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expected = redis.pfcount("activity:tags:#{tag.id}:#{(at_time - 1.day).beginning_of_day.to_i}:accounts").to_f
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expected = 1.0 if expected.zero?
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observed = redis.pfcount("activity:tags:#{tag.id}:#{at_time.beginning_of_day.to_i}:accounts").to_f
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max_time = tag.max_score_at
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max_score = tag.max_score
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max_score = 0 if max_time.nil? || max_time < (at_time - MAX_SCORE_COOLDOWN)
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score = begin
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if expected > observed || observed < THRESHOLD
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0
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else
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((observed - expected)**2) / expected
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end
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end
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if score > max_score
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max_score = score
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max_time = at_time
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# Not interested in triggering any callbacks for this
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tag.update_columns(max_score: max_score, max_score_at: max_time)
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end
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decaying_score = max_score * (0.5**((at_time.to_f - max_time.to_f) / MAX_SCORE_HALFLIFE.to_f))
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if decaying_score.zero?
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redis.zrem(KEY, tag.id)
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else
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redis.zadd(KEY, decaying_score, tag.id)
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end
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end
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users_for_review = User.staff.includes(:account).to_a.select(&:allows_trending_tag_emails?)
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# Second pass to notify about previously unreviewed trends
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tags.each do |tag|
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current_rank = redis.zrevrank(KEY, tag.id)
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needs_review_notification = tag.requires_review? && !tag.requested_review?
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rank_passes_threshold = current_rank.present? && current_rank <= REVIEW_THRESHOLD
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next unless !tag.trendable? && rank_passes_threshold && needs_review_notification
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tag.touch(:requested_review_at)
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users_for_review.each do |user|
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AdminMailer.new_trending_tag(user.account, tag).deliver_later!
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end
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end
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# Trim older items
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redis.zremrangebyrank(KEY, 0, -(LIMIT + 1))
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redis.zremrangebyscore(KEY, '(0.3', '-inf')
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end
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def get(limit, filtered: true)
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tag_ids = redis.zrevrange(KEY, 0, LIMIT - 1).map(&:to_i)
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tags = Tag.where(id: tag_ids)
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tags = tags.trendable if filtered
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tags = tags.index_by(&:id)
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tag_ids.map { |tag_id| tags[tag_id] }.compact.take(limit)
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end
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def trending?(tag)
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rank = redis.zrevrank(KEY, tag.id)
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rank.present? && rank < LIMIT
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end
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private
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def increment_historical_use!(tag_id, at_time)
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key = "activity:tags:#{tag_id}:#{at_time.beginning_of_day.to_i}"
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redis.incrby(key, 1)
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redis.expire(key, EXPIRE_HISTORY_AFTER)
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end
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def increment_unique_use!(tag_id, account_id, at_time)
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key = "activity:tags:#{tag_id}:#{at_time.beginning_of_day.to_i}:accounts"
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redis.pfadd(key, account_id)
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redis.expire(key, EXPIRE_HISTORY_AFTER)
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end
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def increment_use!(tag_id, at_time)
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key = "#{KEY}:used:#{at_time.beginning_of_day.to_i}"
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redis.sadd(key, tag_id)
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redis.expire(key, EXPIRE_HISTORY_AFTER)
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end
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end
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end
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