2fb1c02eb7
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
|
|
|
|
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
|