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- # frozen_string_literal: true
- class Trends::Links < Trends::Base
- PREFIX = 'trending_links'
- self.default_options = {
- threshold: 5,
- review_threshold: 3,
- max_score_cooldown: 2.days.freeze,
- max_score_halflife: 8.hours.freeze,
- decay_threshold: 1,
- }
- def register(status, at_time = Time.now.utc)
- original_status = status.proper
- return unless (original_status.public_visibility? && status.public_visibility?) &&
- !(original_status.account.silenced? || status.account.silenced?) &&
- !(original_status.spoiler_text? || original_status.sensitive?)
- original_status.preview_cards.each do |preview_card|
- add(preview_card, status.account_id, at_time) if preview_card.appropriate_for_trends?
- end
- end
- def add(preview_card, account_id, at_time = Time.now.utc)
- preview_card.history.add(account_id, at_time)
- record_used_id(preview_card.id, at_time)
- end
- def refresh(at_time = Time.now.utc)
- preview_cards = PreviewCard.where(id: (recently_used_ids(at_time) + currently_trending_ids(false, -1)).uniq)
- calculate_scores(preview_cards, at_time)
- end
- def request_review
- preview_cards = PreviewCard.where(id: currently_trending_ids(false, -1))
- preview_cards.filter_map do |preview_card|
- next unless would_be_trending?(preview_card.id) && !preview_card.trendable? && preview_card.requires_review_notification?
- if preview_card.provider.nil?
- preview_card.provider = PreviewCardProvider.create(domain: preview_card.domain, requested_review_at: Time.now.utc)
- else
- preview_card.provider.touch(:requested_review_at)
- end
- preview_card
- end
- end
- protected
- def key_prefix
- PREFIX
- end
- def klass
- PreviewCard
- end
- private
- def calculate_scores(preview_cards, at_time)
- global_items = []
- locale_items = Hash.new { |h, key| h[key] = [] }
- preview_cards.each do |preview_card|
- expected = preview_card.history.get(at_time - 1.day).accounts.to_f
- expected = 1.0 if expected.zero?
- observed = preview_card.history.get(at_time).accounts.to_f
- max_time = preview_card.max_score_at
- max_score = preview_card.max_score
- max_score = 0 if max_time.nil? || max_time < (at_time - options[:max_score_cooldown])
- score = begin
- if expected > observed || observed < options[:threshold]
- 0
- else
- ((observed - expected)**2) / expected
- end
- end
- if score > max_score
- max_score = score
- max_time = at_time
- # Not interested in triggering any callbacks for this
- preview_card.update_columns(max_score: max_score, max_score_at: max_time)
- end
- decaying_score = max_score * (0.5**((at_time.to_f - max_time.to_f) / options[:max_score_halflife].to_f))
- next unless decaying_score >= options[:decay_threshold]
- global_items << { score: decaying_score, item: preview_card }
- locale_items[preview_card.language] << { score: decaying_score, item: preview_card } if valid_locale?(preview_card.language)
- end
- replace_items('', global_items)
- Trends.available_locales.each do |locale|
- replace_items(":#{locale}", locale_items[locale])
- end
- end
- def filter_for_allowed_items(items)
- items.select { |item| item[:item].trendable? }
- end
- def would_be_trending?(id)
- score(id) > score_at_rank(options[:review_threshold] - 1)
- end
- end
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