diff options
Diffstat (limited to 'app/models')
| -rw-r--r-- | app/models/tag.rb | 4 | ||||
| -rw-r--r-- | app/models/trending_tags.rb | 102 |
2 files changed, 74 insertions, 32 deletions
diff --git a/app/models/tag.rb b/app/models/tag.rb index 945e3a3c6..135e0a030 100644 --- a/app/models/tag.rb +++ b/app/models/tag.rb @@ -7,14 +7,14 @@ # name :string default(""), not null # created_at :datetime not null # updated_at :datetime not null -# score :integer # usable :boolean # trendable :boolean # listable :boolean # reviewed_at :datetime # requested_review_at :datetime # last_status_at :datetime -# last_trend_at :datetime +# max_score :float +# max_score_at :datetime # class Tag < ApplicationRecord diff --git a/app/models/trending_tags.rb b/app/models/trending_tags.rb index e4ce988c1..e1b92b175 100644 --- a/app/models/trending_tags.rb +++ b/app/models/trending_tags.rb @@ -7,6 +7,8 @@ class TrendingTags THRESHOLD = 5 LIMIT = 10 REVIEW_THRESHOLD = 3 + MAX_SCORE_COOLDOWN = 3.days.freeze + MAX_SCORE_HALFLIFE = 6.hours.freeze class << self include Redisable @@ -16,14 +18,75 @@ class TrendingTags increment_historical_use!(tag.id, at_time) increment_unique_use!(tag.id, account.id, at_time) - increment_vote!(tag, at_time) + increment_use!(tag.id, at_time) tag.update(last_status_at: Time.now.utc) if tag.last_status_at.nil? || tag.last_status_at < 12.hours.ago - tag.update(last_trend_at: Time.now.utc) if trending?(tag) && (tag.last_trend_at.nil? || tag.last_trend_at < 12.hours.ago) + end + + def update!(at_time = Time.now.utc) + tag_ids = redis.smembers("#{KEY}:used:#{at_time.beginning_of_day.to_i}") + redis.zrange(KEY, 0, -1) + tags = Tag.where(id: tag_ids.uniq) + + # First pass to calculate scores and update the set + + tags.each do |tag| + expected = redis.pfcount("activity:tags:#{tag.id}:#{(at_time - 1.day).beginning_of_day.to_i}:accounts").to_f + expected = 1.0 if expected.zero? + observed = redis.pfcount("activity:tags:#{tag.id}:#{at_time.beginning_of_day.to_i}:accounts").to_f + max_time = tag.max_score_at + max_score = tag.max_score + max_score = 0 if max_time.nil? || max_time < (at_time - MAX_SCORE_COOLDOWN) + + score = begin + if expected > observed || observed < THRESHOLD + 0 + else + ((observed - expected)**2) / expected + end + end + + if score > max_score + max_score = score + max_time = at_time + + # Not interested in triggering any callbacks for this + tag.update_columns(max_score: max_score, max_score_at: max_time) + end + + decaying_score = max_score * (0.5**((at_time.to_f - max_time.to_f) / MAX_SCORE_HALFLIFE.to_f)) + + if decaying_score.zero? + redis.zrem(KEY, tag.id) + else + redis.zadd(KEY, decaying_score, tag.id) + end + end + + users_for_review = User.staff.includes(:account).to_a.select(&:allows_trending_tag_emails?) + + # Second pass to notify about previously unreviewed trends + + tags.each do |tag| + current_rank = redis.zrevrank(KEY, tag.id) + needs_review_notification = tag.requires_review? && !tag.requested_review? + rank_passes_threshold = current_rank.present? && current_rank <= REVIEW_THRESHOLD + + next unless !tag.trendable? && rank_passes_threshold && needs_review_notification + + tag.touch(:requested_review_at) + + users_for_review.each do |user| + AdminMailer.new_trending_tag(user.account, tag).deliver_later! + end + end + + # Trim older items + + redis.zremrangebyrank(KEY, 0, -(LIMIT + 1)) end def get(limit, filtered: true) - tag_ids = redis.zrevrange("#{KEY}:#{Time.now.utc.beginning_of_day.to_i}", 0, LIMIT - 1).map(&:to_i) + tag_ids = redis.zrevrange(KEY, 0, LIMIT - 1).map(&:to_i) tags = Tag.where(id: tag_ids) tags = tags.where(trendable: true) if filtered @@ -33,8 +96,8 @@ class TrendingTags end def trending?(tag) - rank = redis.zrevrank("#{KEY}:#{Time.now.utc.beginning_of_day.to_i}", tag.id) - rank.present? && rank <= LIMIT + rank = redis.zrevrank(KEY, tag.id) + rank.present? && rank < LIMIT end private @@ -51,31 +114,10 @@ class TrendingTags redis.expire(key, EXPIRE_HISTORY_AFTER) end - def increment_vote!(tag, at_time) - key = "#{KEY}:#{at_time.beginning_of_day.to_i}" - expected = redis.pfcount("activity:tags:#{tag.id}:#{(at_time - 1.day).beginning_of_day.to_i}:accounts").to_f - expected = 1.0 if expected.zero? - observed = redis.pfcount("activity:tags:#{tag.id}:#{at_time.beginning_of_day.to_i}:accounts").to_f - - if expected > observed || observed < THRESHOLD - redis.zrem(key, tag.id) - else - score = ((observed - expected)**2) / expected - old_rank = redis.zrevrank(key, tag.id) - - redis.zadd(key, score, tag.id) - request_review!(tag) if (old_rank.nil? || old_rank > REVIEW_THRESHOLD) && redis.zrevrank(key, tag.id) <= REVIEW_THRESHOLD && !tag.trendable? && tag.requires_review? && !tag.requested_review? - end - - redis.expire(key, EXPIRE_TRENDS_AFTER) - end - - def request_review!(tag) - return unless Setting.trends - - tag.touch(:requested_review_at) - - User.staff.includes(:account).find_each { |u| AdminMailer.new_trending_tag(u.account, tag).deliver_later! if u.allows_trending_tag_emails? } + def increment_use!(tag_id, at_time) + key = "#{KEY}:used:#{at_time.beginning_of_day.to_i}" + redis.sadd(key, tag_id) + redis.expire(key, EXPIRE_HISTORY_AFTER) end end end |