73 lines
2.5 KiB
Ruby
73 lines
2.5 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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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_vote!(tag, at_time)
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end
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def get(limit, filtered: true)
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tag_ids = redis.zrevrange("#{KEY}:#{Time.now.utc.beginning_of_day.to_i}", 0, limit - 1).map(&:to_i)
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tags = Tag.where(id: tag_ids)
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tags = tags.where(trendable: true) if filtered
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tags = tags.each_with_object({}) { |tag, h| h[tag.id] = tag }
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tag_ids.map { |tag_id| tags[tag_id] }.compact
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end
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def trending?(tag)
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rank = redis.zrevrank("#{KEY}:#{Time.now.utc.beginning_of_day.to_i}", tag.id)
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rank.present? && rank <= 10
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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_vote!(tag, at_time)
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key = "#{KEY}:#{at_time.beginning_of_day.to_i}"
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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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if expected > observed || observed < THRESHOLD
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redis.zrem(key, tag.id)
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else
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score = ((observed - expected)**2) / expected
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old_rank = redis.zrevrank(key, tag.id)
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redis.zadd(key, score, tag.id)
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request_review!(tag) if (old_rank.nil? || old_rank > 10) && redis.zrevrank(key, tag.id) <= 10 && !tag.trendable? && tag.requires_review? && !tag.requested_review?
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end
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redis.expire(key, EXPIRE_TRENDS_AFTER)
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end
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def request_review!(tag)
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User.staff.includes(:account).find_each { |u| AdminMailer.new_trending_tag(u.account, tag).deliver_later! if u.allows_trending_tag_emails? }
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end
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end
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end
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