discourse/app/models/post_timing.rb

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# frozen_string_literal: true
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class PostTiming < ActiveRecord::Base
belongs_to :topic
belongs_to :user
validates_presence_of :post_number
validates_presence_of :msecs
def self.pretend_read(topic_id, actual_read_post_number, pretend_read_post_number)
# This is done in SQL cause the logic is quite tricky and we want to do this in one db hit
#
DB.exec("INSERT INTO post_timings(topic_id, user_id, post_number, msecs)
SELECT :topic_id, user_id, :pretend_read_post_number, 1
FROM post_timings pt
WHERE topic_id = :topic_id AND
post_number = :actual_read_post_number AND
NOT EXISTS (
SELECT 1 FROM post_timings pt1
WHERE pt1.topic_id = pt.topic_id AND
pt1.post_number = :pretend_read_post_number AND
pt1.user_id = pt.user_id
)
",
pretend_read_post_number: pretend_read_post_number,
topic_id: topic_id,
actual_read_post_number: actual_read_post_number
)
TopicUser.ensure_consistency!(topic_id)
end
def self.record_new_timing(args)
row_count = DB.exec("INSERT INTO post_timings (topic_id, user_id, post_number, msecs)
SELECT :topic_id, :user_id, :post_number, :msecs
ON CONFLICT DO NOTHING",
args)
# concurrency is hard, we are not running serialized so this can possibly
# still happen, if it happens we just don't care, its an invalid record anyway
return if row_count == 0
Post.where(['topic_id = :topic_id and post_number = :post_number', args]).update_all 'reads = reads + 1'
UserStat.where(user_id: args[:user_id]).update_all 'posts_read_count = posts_read_count + 1'
end
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# Increases a timer if a row exists, otherwise create it
def self.record_timing(args)
rows = DB.exec(<<~SQL, args)
UPDATE post_timings
SET msecs = msecs + :msecs
WHERE topic_id = :topic_id
AND user_id = :user_id
AND post_number = :post_number
SQL
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record_new_timing(args) if rows == 0
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end
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def self.destroy_last_for(user, topic_id)
topic = Topic.find(topic_id)
post_number = user.staff? ? topic.highest_staff_post_number : topic.highest_post_number
last_read = post_number - 1
PostTiming.transaction do
PostTiming.where("topic_id = ? AND user_id = ? AND post_number > ?", topic.id, user.id, last_read).delete_all
if last_read < 1
last_read = nil
end
TopicUser.where(user_id: user.id, topic_id: topic.id).update_all(
highest_seen_post_number: last_read,
last_read_post_number: last_read
)
topic.posts.find_by(post_number: post_number).decrement!(:reads)
if !topic.private_message?
set_minimum_first_unread!(user_id: user.id, date: topic.updated_at)
end
end
end
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def self.destroy_for(user_id, topic_ids)
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PostTiming.transaction do
PostTiming
.where('user_id = ? and topic_id in (?)', user_id, topic_ids)
.delete_all
TopicUser
.where('user_id = ? and topic_id in (?)', user_id, topic_ids)
.delete_all
Post.where(topic_id: topic_ids).update_all('reads = reads - 1')
date = Topic.listable_topics.where(id: topic_ids).minimum(:updated_at)
if date
set_minimum_first_unread!(user_id: user_id, date: date)
end
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end
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end
def self.set_minimum_first_unread!(user_id:, date:)
DB.exec(<<~SQL, date: date, user_id: user_id)
UPDATE user_stats
SET first_unread_at = :date
WHERE first_unread_at > :date AND
user_id = :user_id
SQL
end
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MAX_READ_TIME_PER_BATCH = 60 * 1000.0
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def self.process_timings(current_user, topic_id, topic_time, timings, opts = {})
UserStat.update_time_read!(current_user.id)
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max_time_per_post = ((Time.now - current_user.created_at) * 1000.0)
max_time_per_post = MAX_READ_TIME_PER_BATCH if max_time_per_post > MAX_READ_TIME_PER_BATCH
highest_seen = 1
new_posts_read = 0
join_table = []
i = timings.length
while i > 0
i -= 1
timings[i][1] = max_time_per_post if timings[i][1] > max_time_per_post
timings.delete_at(i) if timings[i][0] < 1
end
timings.each_with_index do |(post_number, time), index|
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join_table << "SELECT #{topic_id.to_i} topic_id, #{post_number.to_i} post_number,
#{current_user.id.to_i} user_id, #{time.to_i} msecs, #{index} idx"
highest_seen = post_number.to_i > highest_seen ?
post_number.to_i : highest_seen
end
if join_table.length > 0
sql = <<~SQL
UPDATE post_timings t
SET msecs = t.msecs + x.msecs
FROM (#{join_table.join(" UNION ALL ")}) x
WHERE x.topic_id = t.topic_id AND
x.post_number = t.post_number AND
x.user_id = t.user_id
RETURNING x.idx
SQL
existing = Set.new(DB.query_single(sql))
sql = <<~SQL
SELECT 1 FROM topics
WHERE deleted_at IS NULL AND
archetype = 'regular' AND
id = :topic_id
SQL
is_regular = DB.exec(sql, topic_id: topic_id) == 1
new_posts_read = timings.size - existing.size if is_regular
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timings.each_with_index do |(post_number, time), index|
unless existing.include?(index)
PostTiming.record_new_timing(topic_id: topic_id,
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post_number: post_number,
user_id: current_user.id,
msecs: time)
end
end
end
total_changed = 0
if timings.length > 0
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total_changed = Notification.mark_posts_read(current_user, topic_id, timings.map { |t| t[0] })
end
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topic_time = max_time_per_post if topic_time > max_time_per_post
TopicUser.update_last_read(current_user, topic_id, highest_seen, new_posts_read, topic_time, opts)
TopicGroup.update_last_read(current_user, topic_id, highest_seen)
if total_changed > 0
current_user.reload
current_user.publish_notifications_state
end
end
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end
# == Schema Information
#
# Table name: post_timings
#
# topic_id :integer not null
# post_number :integer not null
# user_id :integer not null
# msecs :integer not null
#
# Indexes
#
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# index_post_timings_on_user_id (user_id)
# post_timings_summary (topic_id,post_number)
# post_timings_unique (topic_id,post_number,user_id) UNIQUE
#