forked from cybrespace/mastodon
6476f7e4da
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
122 lines
3.2 KiB
Ruby
122 lines
3.2 KiB
Ruby
# frozen_string_literal: true
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class Trends::Statuses < Trends::Base
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PREFIX = 'trending_statuses'
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self.default_options = {
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threshold: 5,
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review_threshold: 3,
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score_halflife: 2.hours.freeze,
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decay_threshold: 0.3,
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}
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class Query < Trends::Query
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def filtered_for!(account)
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@account = account
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self
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end
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def filtered_for(account)
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clone.filtered_for!(account)
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end
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private
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def apply_scopes(scope)
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if @account.nil?
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scope
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else
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scope.not_excluded_by_account(@account).not_domain_blocked_by_account(@account)
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end
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end
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end
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def register(status, at_time = Time.now.utc)
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add(status.proper, status.account_id, at_time) if eligible?(status.proper)
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end
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def add(status, _account_id, at_time = Time.now.utc)
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# We rely on the total reblogs and favourites count, so we
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# don't record which account did the what and when here
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record_used_id(status.id, at_time)
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end
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def query
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Query.new(key_prefix, klass)
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end
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def refresh(at_time = Time.now.utc)
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statuses = Status.where(id: (recently_used_ids(at_time) + currently_trending_ids(false, -1)).uniq).includes(:account, :media_attachments)
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calculate_scores(statuses, at_time)
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end
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def request_review
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statuses = Status.where(id: currently_trending_ids(false, -1)).includes(:account)
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statuses.filter_map do |status|
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next unless would_be_trending?(status.id) && !status.trendable? && status.requires_review_notification?
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status.account.touch(:requested_review_at)
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status
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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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def klass
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Status
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end
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private
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def eligible?(status)
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status.public_visibility? && status.account.discoverable? && !status.account.silenced? && status.spoiler_text.blank? && !status.sensitive? && !status.reply?
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end
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def calculate_scores(statuses, at_time)
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global_items = []
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locale_items = Hash.new { |h, key| h[key] = [] }
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statuses.each do |status|
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expected = 1.0
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observed = (status.reblogs_count + status.favourites_count).to_f
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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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decaying_score = score * (0.5**((at_time.to_f - status.created_at.to_f) / options[:score_halflife].to_f))
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next unless decaying_score >= options[:decay_threshold]
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global_items << { score: decaying_score, item: status }
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locale_items[status.language] << { account_id: status.account_id, score: decaying_score, item: status } if valid_locale?(status.language)
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end
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replace_items('', global_items)
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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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def filter_for_allowed_items(items)
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# Show only one status per account, pick the one with the highest score
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# that's also eligible to trend
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items.group_by { |item| item[:account_id] }.values.filter_map { |account_items| account_items.select { |item| item[:item].trendable? && item[:item].account.discoverable? }.max_by { |item| item[:score] } }
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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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