59 lines
1.7 KiB
Ruby
59 lines
1.7 KiB
Ruby
# frozen_string_literal: true
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module Gitlab
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module Search
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# This is an abstract class used for storing/searching recently viewed
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# items. The #type and #finder methods are the only ones needed to be
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# implemented by classes inheriting from this.
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class RecentItems
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ITEMS_LIMIT = 100
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EXPIRES_AFTER = 7.days
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def initialize(user:, items_limit: ITEMS_LIMIT, expires_after: EXPIRES_AFTER)
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@user = user
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@items_limit = items_limit
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@expires_after = expires_after
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end
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def log_view(item)
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with_redis do |redis|
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redis.zadd(key, Time.now.to_f, item.id)
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redis.expire(key, @expires_after)
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# There is a race condition here where we could end up removing an
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# item from 2 places concurrently but this is fine since worst case
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# scenario we remove an extra item from the end of the list.
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if redis.zcard(key) > @items_limit
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redis.zremrangebyrank(key, 0, 0) # Remove least recent
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end
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end
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end
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def search(term)
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ids = with_redis do |redis|
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redis.zrevrange(key, 0, @items_limit - 1)
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end.map(&:to_i)
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finder.new(@user, search: term, in: 'title').execute.reorder(nil).id_in_ordered(ids) # rubocop: disable CodeReuse/ActiveRecord
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end
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private
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def with_redis(&blk)
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Gitlab::Redis::SharedState.with(&blk) # rubocop: disable CodeReuse/ActiveRecord
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end
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def key
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"recent_items:#{type.name.downcase}:#{@user.id}"
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end
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def type
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raise NotImplementedError
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end
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def finder
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raise NotImplementedError
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end
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end
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end
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end
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