Calculate trends in temporary sets to avoid having to manage items that go below the decay threshold while not having any moments where a half-processed set is accessible to end-users
		
			
				
	
	
		
			114 lines
		
	
	
	
		
			3.4 KiB
		
	
	
	
		
			Ruby
		
	
	
	
	
	
			
		
		
	
	
			114 lines
		
	
	
	
		
			3.4 KiB
		
	
	
	
		
			Ruby
		
	
	
	
	
	
| # frozen_string_literal: true
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| 
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| class Trends::Links < Trends::Base
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|   PREFIX = 'trending_links'
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| 
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|   self.default_options = {
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|     threshold: 5,
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|     review_threshold: 3,
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|     max_score_cooldown: 2.days.freeze,
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|     max_score_halflife: 8.hours.freeze,
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|     decay_threshold: 1,
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|   }
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| 
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|   def register(status, at_time = Time.now.utc)
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|     original_status = status.proper
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| 
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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? || original_status.sensitive?)
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| 
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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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| 
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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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| 
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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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|   end
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| 
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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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| 
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|     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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| 
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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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| 
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|       preview_card
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|     end
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|   end
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| 
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|   protected
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| 
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|   def key_prefix
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|     PREFIX
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|   end
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| 
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|   def klass
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|     PreviewCard
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|   end
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| 
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|   private
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| 
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|   def calculate_scores(preview_cards, at_time)
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|     global_items = []
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|     locale_items = Hash.new { |h, key| h[key] = [] }
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| 
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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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| 
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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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| 
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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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| 
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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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| 
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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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| 
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|       next unless decaying_score >= options[:decay_threshold]
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| 
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|       global_items << { score: decaying_score, item:  preview_card }
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|       locale_items[preview_card.language] << { score: decaying_score, item: preview_card } if valid_locale?(preview_card.language)
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|     end
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| 
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|     replace_items('', global_items)
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| 
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|     Trends.available_locales.each do |locale|
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|       replace_items(":#{locale}", locale_items[locale])
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|     end
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|   end
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| 
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|   def filter_for_allowed_items(items)
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|     items.select { |item| item[:item].trendable? }
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|   end
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| 
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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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