135 lines
4.6 KiB
Ruby
135 lines
4.6 KiB
Ruby
# this class is used to mirror unread and new status back to end users
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# in JavaScript there is a mirror class that is kept in-sync using the mssage bus
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# the allows end users to always know which topics have unread posts in them
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# and which topics are new
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class TopicTrackingState
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include ActiveModel::SerializerSupport
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CHANNEL = "/user-tracking"
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attr_accessor :user_id, :topic_id, :highest_post_number, :last_read_post_number, :created_at, :category_name
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def self.publish_new(topic)
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message = {
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topic_id: topic.id,
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message_type: "new_topic",
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payload: {
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last_read_post_number: nil,
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highest_post_number: 1,
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created_at: topic.created_at,
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topic_id: topic.id
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}
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}
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group_ids = topic.category && topic.category.secure_group_ids
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MessageBus.publish("/new", message.as_json, group_ids: group_ids)
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publish_read(topic.id, 1, topic.user_id)
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end
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def self.publish_unread(post)
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# TODO at high scale we are going to have to defer this,
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# perhaps cut down to users that are around in the last 7 days as well
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#
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group_ids = post.topic.category && post.topic.category.secure_group_ids
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TopicUser
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.tracking(post.topic_id)
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.select([:user_id,:last_read_post_number])
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.each do |tu|
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message = {
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topic_id: post.topic_id,
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message_type: "unread",
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payload: {
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last_read_post_number: tu.last_read_post_number,
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highest_post_number: post.post_number,
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created_at: post.created_at,
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topic_id: post.topic_id
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}
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}
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MessageBus.publish("/unread/#{tu.user_id}", message.as_json, group_ids: group_ids)
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end
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end
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def self.publish_read(topic_id, last_read_post_number, user_id)
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highest_post_number = Topic.where(id: topic_id).pluck(:highest_post_number).first
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message = {
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topic_id: topic_id,
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message_type: "read",
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payload: {
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last_read_post_number: last_read_post_number,
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highest_post_number: highest_post_number,
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topic_id: topic_id
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}
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}
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MessageBus.publish("/unread/#{user_id}", message.as_json, user_ids: [user_id])
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end
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def self.treat_as_new_topic_clause
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User.where("CASE
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WHEN COALESCE(u.new_topic_duration_minutes, :default_duration) = :always THEN u.created_at
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WHEN COALESCE(u.new_topic_duration_minutes, :default_duration) = :last_visit THEN COALESCE(u.previous_visit_at,u.created_at)
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ELSE (:now::timestamp - INTERVAL '1 MINUTE' * COALESCE(u.new_topic_duration_minutes, :default_duration))
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END",
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now: DateTime.now,
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last_visit: User::NewTopicDuration::LAST_VISIT,
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always: User::NewTopicDuration::ALWAYS,
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default_duration: SiteSetting.new_topic_duration_minutes
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).where_values[0]
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end
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def self.report(user_ids, topic_id = nil)
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# Sam: this is a hairy report, in particular I need custom joins and fancy conditions
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# Dropping to sql_builder so I can make sense of it.
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#
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# Keep in mind, we need to be able to filter on a GROUP of users, and zero in on topic
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# all our existing scope work does not do this
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#
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# This code needs to be VERY efficient as it is triggered via the message bus and may steal
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# cycles from usual requests
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#
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unread = TopicQuery.unread_filter(Topic).where_values.join(" AND ")
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new = TopicQuery.new_filter(Topic, "xxx").where_values.join(" AND ").gsub!("'xxx'", treat_as_new_topic_clause)
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sql = <<SQL
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SELECT u.id AS user_id, topics.id AS topic_id, topics.created_at, highest_post_number, last_read_post_number, c.name AS category_name
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FROM users u
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FULL OUTER JOIN topics ON 1=1
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LEFT JOIN topic_users tu ON tu.topic_id = topics.id AND tu.user_id = u.id
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LEFT JOIN categories c ON c.id = topics.category_id
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WHERE u.id IN (:user_ids) AND
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topics.archetype <> 'private_message' AND
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((#{unread}) OR (#{new})) AND
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(topics.visible OR u.admin OR u.moderator) AND
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topics.deleted_at IS NULL AND
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( category_id IS NULL OR NOT c.read_restricted OR category_id IN (
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SELECT c2.id FROM categories c2
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JOIN category_groups cg ON cg.category_id = c2.id
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JOIN group_users gu ON gu.user_id = u.id AND cg.group_id = gu.group_id
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WHERE c2.read_restricted )
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)
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SQL
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if topic_id
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sql << " AND topics.id = :topic_id"
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end
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SqlBuilder.new(sql)
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.map_exec(TopicTrackingState, user_ids: user_ids, topic_id: topic_id)
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end
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end
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