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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,
}
def register(status, at_time = Time.now.utc)
original_status = status.reblog? ? status.reblog : status
return unless original_status.public_visibility? && status.public_visibility? &&
!original_status.account.silenced? && !status.account.silenced? &&
!original_status.spoiler_text?
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)
trim_older_items
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)
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))
add_to_and_remove_from_subsets(preview_card.id, decaying_score, {
all: true,
allowed: preview_card.trendable?,
})
next unless valid_locale?(preview_card.language)
add_to_and_remove_from_subsets(preview_card.id, decaying_score, {
"all:#{preview_card.language}" => true,
"allowed:#{preview_card.language}" => preview_card.trendable?,
})
end
# Clean up localized sets by calculating the intersection with the main
# set. We do this instead of just deleting the localized sets to avoid
# having moments where the API returns empty results
redis.pipelined do
Trends.available_locales.each do |locale|
redis.zinterstore("#{key_prefix}:all:#{locale}", ["#{key_prefix}:all:#{locale}", "#{key_prefix}:all"], aggregate: 'max')
redis.zinterstore("#{key_prefix}:allowed:#{locale}", ["#{key_prefix}:allowed:#{locale}", "#{key_prefix}:all"], aggregate: 'max')
end
end
end
def would_be_trending?(id)
score(id) > score_at_rank(options[:review_threshold] - 1)
end
end
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