68 lines
2.3 KiB
Ruby
68 lines
2.3 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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def record_use!(tag, account, at_time = Time.now.utc)
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return if disallowed_hashtags.include?(tag.name) || account.silenced? || account.bot?
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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.id, at_time)
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end
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def get(limit)
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key = "#{KEY}:#{Time.now.utc.beginning_of_day.to_i}"
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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).to_a.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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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_id, 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.to_s)
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else
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score = ((observed - expected)**2) / expected
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redis.zadd(key, score, tag_id.to_s)
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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 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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