mirror of https://framagit.org/tykayn/mastodon.git
118 lines
3.7 KiB
Ruby
118 lines
3.7 KiB
Ruby
# frozen_string_literal: true
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class Trends::Links < Trends::Base
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PREFIX = 'trending_links'
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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: 8.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.spoiler_text?
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original_status.preview_cards.each do |preview_card|
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add(preview_card, status.account_id, at_time) if preview_card.appropriate_for_trends?
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end
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end
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def add(preview_card, account_id, at_time = Time.now.utc)
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preview_card.history.add(account_id, at_time)
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record_used_id(preview_card.id, at_time)
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end
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def get(allowed, limit)
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preview_card_ids = currently_trending_ids(allowed, limit)
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preview_cards = PreviewCard.where(id: preview_card_ids).index_by(&:id)
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preview_card_ids.map { |id| preview_cards[id] }.compact
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end
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def refresh(at_time = Time.now.utc)
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preview_cards = PreviewCard.where(id: (recently_used_ids(at_time) + currently_trending_ids(false, -1)).uniq)
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calculate_scores(preview_cards, at_time)
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trim_older_items
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end
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def request_review
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preview_cards = PreviewCard.where(id: currently_trending_ids(false, -1))
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preview_cards_requiring_review = preview_cards.filter_map do |preview_card|
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next unless would_be_trending?(preview_card.id) && !preview_card.trendable? && preview_card.requires_review_notification?
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if preview_card.provider.nil?
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preview_card.provider = PreviewCardProvider.create(domain: preview_card.domain, requested_review_at: Time.now.utc)
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else
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preview_card.provider.touch(:requested_review_at)
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end
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preview_card
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end
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return if preview_cards_requiring_review.empty?
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User.staff.includes(:account).find_each do |user|
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AdminMailer.new_trending_links(user.account, preview_cards_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(preview_cards, at_time)
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preview_cards.each do |preview_card|
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expected = preview_card.history.get(at_time - 1.day).accounts.to_f
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expected = 1.0 if expected.zero?
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observed = preview_card.history.get(at_time).accounts.to_f
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max_time = preview_card.max_score_at
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max_score = preview_card.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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preview_card.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", preview_card.id)
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redis.zrem("#{PREFIX}:allowed", preview_card.id)
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else
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redis.zadd("#{PREFIX}:all", decaying_score, preview_card.id)
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if preview_card.trendable?
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redis.zadd("#{PREFIX}:allowed", decaying_score, preview_card.id)
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else
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redis.zrem("#{PREFIX}:allowed", preview_card.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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