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We cap new and unread at 2/5th of SiteSetting.max_tracked_new_unread This dynamic capping is applied under 2 conditions: 1. New capping is applied once every 15 minutes in the periodical job, this effectively ensures that usually even super active sites are capped at 200 new items 2. Unread capping is applied if a user hits max_tracked_new_unread, meaning if new + unread == 500, we defer a job that runs within 15 minutes that will cap user at 200 unread This logic ensures that at worst case a user gets "bad" numbers for 15 minutes and then the system goes ahead and fixes itself up
393 lines
14 KiB
Ruby
393 lines
14 KiB
Ruby
class TopicUser < ActiveRecord::Base
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belongs_to :user
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belongs_to :topic
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# used for serialization
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attr_accessor :post_action_data
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scope :tracking, lambda { |topic_id|
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where(topic_id: topic_id)
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.where("COALESCE(topic_users.notification_level, :regular) >= :tracking",
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regular: TopicUser.notification_levels[:regular],
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tracking: TopicUser.notification_levels[:tracking])
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}
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# Class methods
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class << self
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# Enums
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def notification_levels
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@notification_levels ||= Enum.new(:muted, :regular, :tracking, :watching, start: 0)
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end
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def notification_reasons
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@notification_reasons ||= Enum.new(
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:created_topic,
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:user_changed,
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:user_interacted,
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:created_post,
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:auto_watch,
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:auto_watch_category,
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:auto_mute_category,
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:auto_track_category,
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:plugin_changed
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)
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end
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def auto_track(user_id, topic_id, reason)
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if TopicUser.where(user_id: user_id, topic_id: topic_id, notifications_reason_id: nil).exists?
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change(user_id, topic_id,
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notification_level: notification_levels[:tracking],
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notifications_reason_id: reason
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)
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MessageBus.publish("/topic/#{topic_id}", {
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notification_level_change: notification_levels[:tracking],
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notifications_reason_id: reason
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}, user_ids: [user_id])
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end
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end
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# Find the information specific to a user in a forum topic
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def lookup_for(user, topics)
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# If the user isn't logged in, there's no last read posts
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return {} if user.blank? || topics.blank?
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topic_ids = topics.map(&:id)
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create_lookup(TopicUser.where(topic_id: topic_ids, user_id: user.id))
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end
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def create_lookup(topic_users)
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topic_users = topic_users.to_a
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result = {}
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return result if topic_users.blank?
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topic_users.each { |ftu| result[ftu.topic_id] = ftu }
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result
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end
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def get(topic, user)
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topic = topic.id if topic.is_a?(Topic)
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user = user.id if user.is_a?(User)
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TopicUser.find_by(topic_id: topic, user_id: user)
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end
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# Change attributes for a user (creates a record when none is present). First it tries an update
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# since there's more likely to be an existing record than not. If the update returns 0 rows affected
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# it then creates the row instead.
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def change(user_id, topic_id, attrs)
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# Sometimes people pass objs instead of the ids. We can handle that.
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topic_id = topic_id.id if topic_id.is_a?(::Topic)
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user_id = user_id.id if user_id.is_a?(::User)
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topic_id = topic_id.to_i
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user_id = user_id.to_i
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TopicUser.transaction do
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attrs = attrs.dup
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if attrs[:notification_level]
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attrs[:notifications_changed_at] ||= DateTime.now
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attrs[:notifications_reason_id] ||= TopicUser.notification_reasons[:user_changed]
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end
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attrs_array = attrs.to_a
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attrs_sql = attrs_array.map { |t| "#{t[0]} = ?" }.join(", ")
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vals = attrs_array.map { |t| t[1] }
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rows = TopicUser.where(topic_id: topic_id, user_id: user_id).update_all([attrs_sql, *vals])
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if rows == 0
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now = DateTime.now
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auto_track_after = User.select(:auto_track_topics_after_msecs).find_by(id: user_id).auto_track_topics_after_msecs
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auto_track_after ||= SiteSetting.default_other_auto_track_topics_after_msecs
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if auto_track_after >= 0 && auto_track_after <= (attrs[:total_msecs_viewed] || 0)
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attrs[:notification_level] ||= notification_levels[:tracking]
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end
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TopicUser.create(attrs.merge!(user_id: user_id, topic_id: topic_id, first_visited_at: now ,last_visited_at: now))
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else
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observe_after_save_callbacks_for topic_id, user_id
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end
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end
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if attrs[:notification_level]
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MessageBus.publish("/topic/#{topic_id}", { notification_level_change: attrs[:notification_level] }, user_ids: [user_id])
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end
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rescue ActiveRecord::RecordNotUnique
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# In case of a race condition to insert, do nothing
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end
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def track_visit!(topic,user)
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topic_id = topic.is_a?(Topic) ? topic.id : topic
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user_id = user.is_a?(User) ? user.id : topic
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now = DateTime.now
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rows = TopicUser.where(topic_id: topic_id, user_id: user_id).update_all(last_visited_at: now)
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if rows == 0
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TopicUser.create(topic_id: topic_id, user_id: user_id, last_visited_at: now, first_visited_at: now)
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else
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observe_after_save_callbacks_for topic_id, user_id
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end
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end
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# Update the last read and the last seen post count, but only if it doesn't exist.
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# This would be a lot easier if psql supported some kind of upsert
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def update_last_read(user, topic_id, post_number, msecs, opts={})
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return if post_number.blank?
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msecs = 0 if msecs.to_i < 0
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args = {
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user_id: user.id,
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topic_id: topic_id,
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post_number: post_number,
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now: DateTime.now,
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msecs: msecs,
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tracking: notification_levels[:tracking],
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threshold: SiteSetting.default_other_auto_track_topics_after_msecs
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}
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# In case anyone seens "highest_seen_post_number" and gets confused, like I do.
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# highest_seen_post_number represents the highest_post_number of the topic when
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# the user visited it. It may be out of alignment with last_read, meaning
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# ... user visited the topic but did not read the posts
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#
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# 86400000 = 1 day
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rows = exec_sql("UPDATE topic_users
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SET
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last_read_post_number = GREATEST(:post_number, tu.last_read_post_number),
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highest_seen_post_number = t.highest_post_number,
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total_msecs_viewed = LEAST(tu.total_msecs_viewed + :msecs,86400000),
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notification_level =
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case when tu.notifications_reason_id is null and (tu.total_msecs_viewed + :msecs) >
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coalesce(u.auto_track_topics_after_msecs,:threshold) and
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coalesce(u.auto_track_topics_after_msecs, :threshold) >= 0 then
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:tracking
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else
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tu.notification_level
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end
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FROM topic_users tu
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join topics t on t.id = tu.topic_id
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join users u on u.id = :user_id
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WHERE
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tu.topic_id = topic_users.topic_id AND
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tu.user_id = topic_users.user_id AND
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tu.topic_id = :topic_id AND
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tu.user_id = :user_id
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RETURNING
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topic_users.notification_level, tu.notification_level old_level, tu.last_read_post_number
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",
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args).values
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if rows.length == 1
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before = rows[0][1].to_i
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after = rows[0][0].to_i
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before_last_read = rows[0][2].to_i
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if before_last_read < post_number
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# The user read at least one new post
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TopicTrackingState.publish_read(topic_id, post_number, user.id, after)
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user.update_posts_read!(post_number - before_last_read, mobile: opts[:mobile])
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end
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if before != after
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MessageBus.publish("/topic/#{topic_id}", { notification_level_change: after }, user_ids: [user.id])
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end
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end
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if rows.length == 0
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# The user read at least one post in a topic that they haven't viewed before.
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args[:new_status] = notification_levels[:regular]
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if (user.auto_track_topics_after_msecs || SiteSetting.default_other_auto_track_topics_after_msecs) == 0
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args[:new_status] = notification_levels[:tracking]
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end
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TopicTrackingState.publish_read(topic_id, post_number, user.id, args[:new_status])
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user.update_posts_read!(post_number, mobile: opts[:mobile])
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exec_sql("INSERT INTO topic_users (user_id, topic_id, last_read_post_number, highest_seen_post_number, last_visited_at, first_visited_at, notification_level)
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SELECT :user_id, :topic_id, :post_number, ft.highest_post_number, :now, :now, :new_status
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FROM topics AS ft
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JOIN users u on u.id = :user_id
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WHERE ft.id = :topic_id
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AND NOT EXISTS(SELECT 1
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FROM topic_users AS ftu
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WHERE ftu.user_id = :user_id and ftu.topic_id = :topic_id)",
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args)
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MessageBus.publish("/topic/#{topic_id}", { notification_level_change: args[:new_status] }, user_ids: [user.id])
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end
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end
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def observe_after_save_callbacks_for(topic_id, user_id)
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TopicUser.where(topic_id: topic_id, user_id: user_id).each do |topic_user|
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UserActionObserver.instance.after_save topic_user
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end
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end
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end
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def self.update_post_action_cache(opts={})
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user_id = opts[:user_id]
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post_id = opts[:post_id]
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topic_id = opts[:topic_id]
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action_type = opts[:post_action_type]
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action_type_name = "liked" if action_type == :like
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action_type_name = "bookmarked" if action_type == :bookmark
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raise ArgumentError, "action_type" if action_type && !action_type_name
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unless action_type_name
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update_post_action_cache(opts.merge(post_action_type: :like))
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update_post_action_cache(opts.merge(post_action_type: :bookmark))
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return
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end
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builder = SqlBuilder.new <<SQL
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UPDATE topic_users tu
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SET #{action_type_name} = x.state
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FROM (
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SELECT CASE WHEN EXISTS (
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SELECT 1
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FROM post_actions pa
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JOIN posts p on p.id = pa.post_id
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JOIN topics t ON t.id = p.topic_id
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WHERE pa.deleted_at IS NULL AND
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p.deleted_at IS NULL AND
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t.deleted_at IS NULL AND
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pa.post_action_type_id = :action_type_id AND
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tu2.topic_id = t.id AND
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tu2.user_id = pa.user_id
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LIMIT 1
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) THEN true ELSE false END state, tu2.topic_id, tu2.user_id
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FROM topic_users tu2
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/*where*/
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) x
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WHERE x.topic_id = tu.topic_id AND x.user_id = tu.user_id AND x.state != tu.#{action_type_name}
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SQL
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if user_id
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builder.where("tu2.user_id = :user_id", user_id: user_id)
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end
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if topic_id
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builder.where("tu2.topic_id = :topic_id", topic_id: topic_id)
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end
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if post_id
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builder.where("tu2.topic_id IN (SELECT topic_id FROM posts WHERE id = :post_id)", post_id: post_id)
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builder.where("tu2.user_id IN (SELECT user_id FROM post_actions
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WHERE post_id = :post_id AND
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post_action_type_id = :action_type_id)")
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end
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builder.exec(action_type_id: PostActionType.types[action_type])
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end
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# cap number of unread topics at count, bumping up highest_seen / last_read if needed
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def self.cap_unread!(user_id, count)
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sql = <<SQL
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UPDATE topic_users tu
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SET last_read_post_number = max_number,
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highest_seen_post_number = max_number
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FROM (
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SELECT MAX(post_number) max_number, p.topic_id FROM posts p
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WHERE deleted_at IS NULL
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GROUP BY p.topic_id
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) m
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WHERE tu.user_id = :user_id AND
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m.topic_id = tu.topic_id AND
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tu.topic_id IN (
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#{TopicTrackingState.report_raw_sql(skip_new: true, select: "topics.id")}
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offset :count
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)
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SQL
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TopicUser.exec_sql(sql, user_id: user_id, count: count)
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end
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def self.unread_cap_key
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"unread_cap_user".freeze
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end
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def self.cap_unread_later(user_id)
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$redis.hset TopicUser.unread_cap_key, user_id, ""
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end
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def self.cap_unread_backlog!
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$redis.hkeys(unread_cap_key).map(&:to_i).each do |user_id|
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cap_unread!(user_id, (SiteSetting.max_tracked_new_unread * (2/5.0)).to_i)
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$redis.hdel unread_cap_key, user_id
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end
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end
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def self.ensure_consistency!(topic_id=nil)
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update_post_action_cache(topic_id: topic_id)
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# TODO this needs some reworking, when we mark stuff skipped
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# we up these numbers so they are not in-sync
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# the simple fix is to add a column here, but table is already quite big
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# long term we want to split up topic_users and allow for this better
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builder = SqlBuilder.new <<SQL
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UPDATE topic_users t
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SET
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last_read_post_number = LEAST(GREATEST(last_read, last_read_post_number), max_post_number),
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highest_seen_post_number = LEAST(max_post_number,GREATEST(t.highest_seen_post_number, last_read))
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FROM (
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SELECT topic_id, user_id, MAX(post_number) last_read
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FROM post_timings
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GROUP BY topic_id, user_id
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) as X
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JOIN (
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SELECT p.topic_id, MAX(p.post_number) max_post_number from posts p
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GROUP BY p.topic_id
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) as Y on Y.topic_id = X.topic_id
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/*where*/
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SQL
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builder.where <<SQL
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X.topic_id = t.topic_id AND
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X.user_id = t.user_id AND
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(
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last_read_post_number <> LEAST(GREATEST(last_read, last_read_post_number), max_post_number) OR
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highest_seen_post_number <> LEAST(max_post_number,GREATEST(t.highest_seen_post_number, last_read))
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)
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SQL
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if topic_id
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builder.where("t.topic_id = :topic_id", topic_id: topic_id)
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end
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builder.exec
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end
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end
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# == Schema Information
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#
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# Table name: topic_users
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#
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# user_id :integer not null
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# topic_id :integer not null
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# posted :boolean default(FALSE), not null
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# last_read_post_number :integer
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# highest_seen_post_number :integer
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# last_visited_at :datetime
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# first_visited_at :datetime
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# notification_level :integer default(1), not null
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# notifications_changed_at :datetime
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# notifications_reason_id :integer
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# total_msecs_viewed :integer default(0), not null
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# cleared_pinned_at :datetime
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# id :integer not null, primary key
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# last_emailed_post_number :integer
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# liked :boolean default(FALSE)
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# bookmarked :boolean default(FALSE)
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#
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# Indexes
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#
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# index_topic_users_on_topic_id_and_user_id (topic_id,user_id) UNIQUE
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# index_topic_users_on_user_id_and_topic_id (user_id,topic_id) UNIQUE
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#
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