102 lines
2.8 KiB
Ruby
102 lines
2.8 KiB
Ruby
# frozen_string_literal: true
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class Trends::Base
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include Redisable
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include LanguagesHelper
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class_attribute :default_options
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attr_reader :options
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# @param [Hash] options
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# @option options [Integer] :threshold Minimum amount of uses by unique accounts to begin calculating the score
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# @option options [Integer] :review_threshold Minimum rank (lower = better) before requesting a review
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# @option options [ActiveSupport::Duration] :max_score_cooldown For this amount of time, the peak score (if bigger than current score) is decayed-from
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# @option options [ActiveSupport::Duration] :max_score_halflife How quickly a peak score decays
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def initialize(options = {})
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@options = self.class.default_options.merge(options)
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end
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def register(_status)
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raise NotImplementedError
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end
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def add(*)
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raise NotImplementedError
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end
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def refresh(*)
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raise NotImplementedError
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end
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def request_review
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raise NotImplementedError
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end
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def query
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Trends::Query.new(key_prefix, klass)
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end
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def score(id, locale: nil)
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redis.zscore([key_prefix, 'all', locale].compact.join(':'), id) || 0
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end
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def rank(id, locale: nil)
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redis.zrevrank([key_prefix, 'allowed', locale].compact.join(':'), id)
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end
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def currently_trending_ids(allowed, limit)
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redis.zrevrange(allowed ? "#{key_prefix}:allowed" : "#{key_prefix}:all", 0, limit.positive? ? limit - 1 : limit).map(&:to_i)
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end
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protected
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def key_prefix
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raise NotImplementedError
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end
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def recently_used_ids(at_time = Time.now.utc)
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redis.smembers(used_key(at_time)).map(&:to_i)
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end
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def record_used_id(id, at_time = Time.now.utc)
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redis.sadd(used_key(at_time), id)
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redis.expire(used_key(at_time), 1.day.seconds)
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end
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def score_at_rank(rank)
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redis.zrevrange("#{key_prefix}:allowed", 0, rank, with_scores: true).last&.last || 0
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end
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def replace_items(suffix, items)
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tmp_prefix = "#{key_prefix}:tmp:#{SecureRandom.alphanumeric(6)}#{suffix}"
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allowed_items = filter_for_allowed_items(items)
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redis.pipelined do |pipeline|
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items.each { |item| pipeline.zadd("#{tmp_prefix}:all", item[:score], item[:item].id) }
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allowed_items.each { |item| pipeline.zadd("#{tmp_prefix}:allowed", item[:score], item[:item].id) }
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rename_set(pipeline, "#{tmp_prefix}:all", "#{key_prefix}:all#{suffix}", items)
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rename_set(pipeline, "#{tmp_prefix}:allowed", "#{key_prefix}:allowed#{suffix}", allowed_items)
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end
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end
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def filter_for_allowed_items(items)
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raise NotImplementedError
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end
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private
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def used_key(at_time)
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"#{key_prefix}:used:#{at_time.beginning_of_day.to_i}"
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end
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def rename_set(pipeline, from_key, to_key, set_items)
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if set_items.empty?
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pipeline.del(to_key)
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else
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pipeline.rename(from_key, to_key)
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end
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end
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end
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