mirror of https://framagit.org/tykayn/mastodon.git
112 lines
3.1 KiB
Ruby
112 lines
3.1 KiB
Ruby
# frozen_string_literal: true
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class Trends::Tags < Trends::Base
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PREFIX = 'trending_tags'
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self.default_options = {
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threshold: 15,
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review_threshold: 10,
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max_score_cooldown: 2.days.freeze,
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max_score_halflife: 4.hours.freeze,
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}
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def register(status, at_time = Time.now.utc)
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original_status = status.reblog? ? status.reblog : status
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return unless original_status.public_visibility? && status.public_visibility? &&
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!original_status.account.silenced? && !status.account.silenced?
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original_status.tags.each do |tag|
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add(tag, status.account_id, at_time) if tag.usable?
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end
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end
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def add(tag, account_id, at_time = Time.now.utc)
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tag.history.add(account_id, at_time)
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record_used_id(tag.id, at_time)
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end
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def refresh(at_time = Time.now.utc)
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tags = Tag.where(id: (recently_used_ids(at_time) + currently_trending_ids(false, -1)).uniq)
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calculate_scores(tags, at_time)
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trim_older_items
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end
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def get(allowed, limit)
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tag_ids = currently_trending_ids(allowed, limit)
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tags = Tag.where(id: tag_ids).index_by(&:id)
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tag_ids.map { |id| tags[id] }.compact
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end
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def request_review
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tags = Tag.where(id: currently_trending_ids(false, -1))
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tags_requiring_review = tags.filter_map do |tag|
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next unless would_be_trending?(tag.id) && !tag.trendable? && tag.requires_review_notification?
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tag.touch(:requested_review_at)
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tag
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end
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return if tags_requiring_review.empty?
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User.staff.includes(:account).find_each do |user|
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AdminMailer.new_trending_tags(user.account, tags_requiring_review).deliver_later! if user.allows_trending_tag_emails?
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end
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end
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protected
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def key_prefix
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PREFIX
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end
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private
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def calculate_scores(tags, at_time)
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tags.each do |tag|
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expected = tag.history.get(at_time - 1.day).accounts.to_f
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expected = 1.0 if expected.zero?
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observed = tag.history.get(at_time).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 - options[:max_score_cooldown])
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score = begin
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if expected > observed || observed < options[: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) / options[:max_score_halflife].to_f))
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if decaying_score.zero?
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redis.zrem("#{PREFIX}:all", tag.id)
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redis.zrem("#{PREFIX}:allowed", tag.id)
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else
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redis.zadd("#{PREFIX}:all", decaying_score, tag.id)
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if tag.trendable?
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redis.zadd("#{PREFIX}:allowed", decaying_score, tag.id)
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else
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redis.zrem("#{PREFIX}:allowed", tag.id)
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end
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end
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end
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end
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def would_be_trending?(id)
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score(id) > score_at_rank(options[:review_threshold] - 1)
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end
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end
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