discourse/app/models/topic_tracking_state.rb

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# frozen_string_literal: true
# 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"
UNREAD_MESSAGE_TYPE = "unread".freeze
LATEST_MESSAGE_TYPE = "latest".freeze
attr_accessor :user_id,
:topic_id,
:highest_post_number,
:last_read_post_number,
:created_at,
:category_id,
:notification_level
def self.publish_new(topic)
return unless topic.regular?
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,
category_id: topic.category_id,
archetype: topic.archetype
}
}
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
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def self.publish_latest(topic, staff_only = false)
return unless topic.regular?
message = {
topic_id: topic.id,
message_type: LATEST_MESSAGE_TYPE,
payload: {
bumped_at: topic.bumped_at,
category_id: topic.category_id,
archetype: topic.archetype
}
}
group_ids =
if staff_only
[Group::AUTO_GROUPS[:staff]]
else
topic.category && topic.category.secure_group_ids
end
MessageBus.publish("/latest", message.as_json, group_ids: group_ids)
end
def self.unread_channel_key(user_id)
"/unread/#{user_id}"
end
def self.publish_unread(post)
return unless post.topic.regular?
# 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 =
if post.post_type == Post.types[:whisper]
[Group::AUTO_GROUPS[:staff]]
else
post.topic.category && post.topic.category.secure_group_ids
end
TopicUser
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.tracking(post.topic_id)
.select([:user_id, :last_read_post_number, :notification_level])
.each do |tu|
message = {
topic_id: post.topic_id,
message_type: UNREAD_MESSAGE_TYPE,
payload: {
last_read_post_number: tu.last_read_post_number,
highest_post_number: post.post_number,
created_at: post.created_at,
category_id: post.topic.category_id,
notification_level: tu.notification_level,
archetype: post.topic.archetype
}
}
MessageBus.publish(self.unread_channel_key(tu.user_id), message.as_json, group_ids: group_ids)
end
end
def self.publish_recover(topic)
group_ids = topic.category && topic.category.secure_group_ids
message = {
topic_id: topic.id,
message_type: "recover"
}
MessageBus.publish("/recover", message.as_json, group_ids: group_ids)
end
def self.publish_delete(topic)
group_ids = topic.category && topic.category.secure_group_ids
message = {
topic_id: topic.id,
message_type: "delete"
}
MessageBus.publish("/delete", message.as_json, group_ids: group_ids)
end
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def self.publish_read(topic_id, last_read_post_number, user_id, notification_level = nil)
highest_post_number = DB.query_single("SELECT highest_post_number FROM topics WHERE id = ?", topic_id).first
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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,
notification_level: notification_level
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}
}
MessageBus.publish(self.unread_channel_key(user_id), message.as_json, user_ids: [user_id])
end
def self.treat_as_new_topic_clause
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User.where("GREATEST(CASE
WHEN COALESCE(uo.new_topic_duration_minutes, :default_duration) = :always THEN u.created_at
WHEN COALESCE(uo.new_topic_duration_minutes, :default_duration) = :last_visit THEN COALESCE(u.previous_visit_at,u.created_at)
ELSE (:now::timestamp - INTERVAL '1 MINUTE' * COALESCE(uo.new_topic_duration_minutes, :default_duration))
END, us.new_since, :min_date)",
now: DateTime.now,
last_visit: User::NewTopicDuration::LAST_VISIT,
always: User::NewTopicDuration::ALWAYS,
default_duration: SiteSetting.default_other_new_topic_duration_minutes,
min_date: Time.at(SiteSetting.min_new_topics_time).to_datetime
).where_clause.send(:predicates)[0]
end
def self.report(user, 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
sql = +report_raw_sql(
topic_id: topic_id,
skip_unread: true,
skip_order: true,
staff: user.staff?,
admin: user.admin?,
user: user
)
sql << "\nUNION ALL\n\n"
sql << report_raw_sql(
topic_id: topic_id,
skip_new: true,
skip_order: true,
staff: user.staff?,
filter_old_unread: true,
admin: user.admin?,
user: user
)
DB.query(
sql,
user_id: user.id,
topic_id: topic_id,
min_new_topic_date: Time.at(SiteSetting.min_new_topics_time).to_datetime
)
end
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def self.report_raw_sql(opts = nil)
opts ||= {}
unread =
if opts[:skip_unread]
"1=0"
else
TopicQuery
.unread_filter(Topic, -999, staff: opts && opts[:staff])
.where_clause.send(:predicates)
.join(" AND ")
.gsub("-999", ":user_id")
end
filter_old_unread =
if opts[:filter_old_unread]
" topics.updated_at >= us.first_unread_at AND "
else
""
end
new =
if opts[:skip_new]
"1=0"
else
TopicQuery.new_filter(Topic, "xxx").where_clause.send(:predicates).join(" AND ").gsub!("'xxx'", treat_as_new_topic_clause) +
" AND topics.created_at > :min_new_topic_date" +
" AND (category_users.last_seen_at IS NULL OR topics.created_at > category_users.last_seen_at)"
end
select = (opts[:select]) || "
u.id AS user_id,
topics.id AS topic_id,
topics.created_at,
#{opts[:staff] ? "highest_staff_post_number highest_post_number" : "highest_post_number"},
last_read_post_number,
c.id AS category_id,
tu.notification_level"
category_filter =
if opts[:admin]
""
else
append = "OR u.admin" if !opts.key?(:admin)
<<~SQL
(
NOT c.read_restricted #{append} OR c.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 = :user_id AND cg.group_id = gu.group_id
WHERE c2.read_restricted )
) AND
SQL
end
visibility_filter =
if opts[:staff]
""
else
append = "OR u.admin OR u.moderator" if !opts.key?(:staff)
"(topics.visible #{append}) AND"
end
sql = +<<~SQL
SELECT #{select}
FROM topics
JOIN users u on u.id = :user_id
JOIN user_stats AS us ON us.user_id = u.id
JOIN user_options AS uo ON uo.user_id = u.id
JOIN categories c ON c.id = topics.category_id
LEFT JOIN topic_users tu ON tu.topic_id = topics.id AND tu.user_id = u.id
LEFT JOIN category_users ON category_users.category_id = topics.category_id AND category_users.user_id = #{opts[:user].id}
WHERE u.id = :user_id AND
#{filter_old_unread}
topics.archetype <> 'private_message' AND
((#{unread}) OR (#{new})) AND
#{visibility_filter}
topics.deleted_at IS NULL AND
#{category_filter}
(category_users.id IS NULL OR
last_read_post_number IS NOT NULL OR
category_users.notification_level <> #{CategoryUser.notification_levels[:muted]})
SQL
if opts[:topic_id]
sql << " AND topics.id = :topic_id"
end
unless opts[:skip_order]
sql << " ORDER BY topics.bumped_at DESC"
end
sql
end
def self.publish_private_message(topic, archive_user_id: nil,
post: nil,
group_archive: false)
return unless topic.private_message?
channels = {}
allowed_user_ids = topic.allowed_users.pluck(:id)
if post && allowed_user_ids.include?(post.user_id)
channels["/private-messages/sent"] = [post.user_id]
end
if archive_user_id
user_ids = [archive_user_id]
[
"/private-messages/archive",
"/private-messages/inbox",
"/private-messages/sent",
].each do |channel|
channels[channel] = user_ids
end
end
if channels.except("/private-messages/sent").blank?
channels["/private-messages/inbox"] = allowed_user_ids
end
topic.allowed_groups.each do |group|
group_user_ids = group.users.pluck(:id)
next if group_user_ids.blank?
group_channels = []
group_channels << "/private-messages/group/#{group.name.downcase}"
group_channels << "#{group_channels.first}/archive" if group_archive
group_channels.each { |channel| channels[channel] = group_user_ids }
end
message = {
topic_id: topic.id
}
channels.each do |channel, ids|
MessageBus.publish(
channel,
message.as_json,
user_ids: ids
)
end
end
def self.publish_read_indicator_on_write(topic_id, last_read_post_number, user_id)
topic = Topic.includes(:allowed_groups).select(:highest_post_number, :archetype, :id).find_by(id: topic_id)
if topic&.private_message?
groups = read_allowed_groups_of(topic)
update_topic_list_read_indicator(topic, groups, topic.highest_post_number, user_id, true)
end
end
def self.publish_read_indicator_on_read(topic_id, last_read_post_number, user_id)
topic = Topic.includes(:allowed_groups).select(:highest_post_number, :archetype, :id).find_by(id: topic_id)
if topic&.private_message?
groups = read_allowed_groups_of(topic)
post = Post.find_by(topic_id: topic.id, post_number: last_read_post_number)
trigger_post_read_count_update(post, groups, last_read_post_number, user_id)
update_topic_list_read_indicator(topic, groups, last_read_post_number, user_id, false)
end
end
def self.read_allowed_groups_of(topic)
topic.allowed_groups
.joins(:group_users)
.where(publish_read_state: true)
.select('ARRAY_AGG(group_users.user_id) AS members', :name, :id)
.group('groups.id')
end
def self.update_topic_list_read_indicator(topic, groups, last_read_post_number, user_id, write_event)
return unless last_read_post_number == topic.highest_post_number
message = { topic_id: topic.id, show_indicator: write_event }.as_json
groups_to_update = []
groups.each do |group|
member = group.members.include?(user_id)
member_writing = (write_event && member)
non_member_reading = (!write_event && !member)
next if non_member_reading || member_writing
groups_to_update << group
end
return if groups_to_update.empty?
MessageBus.publish("/private-messages/unread-indicator/#{topic.id}", message, user_ids: groups_to_update.flat_map(&:members))
end
def self.trigger_post_read_count_update(post, groups, last_read_post_number, user_id)
return if !post
return if groups.empty?
opts = { readers_count: post.readers_count, reader_id: user_id }
post.publish_change_to_clients!(:read, opts)
end
end