discourse/app/models/topic_tracking_state.rb

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