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61 lines
2.0 KiB
61 lines
2.0 KiB
# frozen_string_literal: true
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class TrendingTags
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KEY = 'trending_tags'
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HALF_LIFE = 1.day.to_i
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MAX_ITEMS = 500
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EXPIRE_HISTORY_AFTER = 7.days.seconds
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class << self
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def record_use!(tag, account, at_time = Time.now.utc)
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return if disallowed_hashtags.include?(tag.name) || account.silenced?
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increment_vote!(tag.id, at_time)
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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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end
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def get(limit)
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tag_ids = redis.zrevrange(KEY, 0, limit).map(&:to_i)
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tags = Tag.where(id: tag_ids).to_a.map { |tag| [tag.id, tag] }.to_h
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tag_ids.map { |tag_id| tags[tag_id] }.compact
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end
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private
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def increment_vote!(tag_id, at_time)
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redis.zincrby(KEY, (2**((at_time.to_i - epoch) / HALF_LIFE)).to_f, tag_id.to_s)
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redis.zremrangebyrank(KEY, 0, -MAX_ITEMS) if rand < (2.to_f / MAX_ITEMS)
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end
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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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# The epoch needs to be 2.5 years in the future if the half-life is one day
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# While dynamic, it will always be the same within one year
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def epoch
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@epoch ||= Date.new(Date.current.year + 2.5, 10, 1).to_datetime.to_i
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end
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def disallowed_hashtags
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return @disallowed_hashtags if defined?(@disallowed_hashtags)
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@disallowed_hashtags = Setting.disallowed_hashtags.nil? ? [] : Setting.disallowed_hashtags
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@disallowed_hashtags = @disallowed_hashtags.split(' ') if @disallowed_hashtags.is_a? String
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@disallowed_hashtags = @disallowed_hashtags.map(&:downcase)
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end
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def redis
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Redis.current
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end
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end
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end
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