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FIX: rare concurrency error when updating timings

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This commit is contained in:
Sam 2016-03-24 16:02:23 +11:00
parent 936b55faad
commit f82b5dbc82
1 changed files with 22 additions and 9 deletions
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31
app/models/topic_user.rb
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@ -165,6 +165,16 @@ class TopicUser < ActiveRecord::Base
RETURNING
topic_users.notification_level, tu.notification_level old_level, tu.last_read_post_number
"
INSERT_TOPIC_USER_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)
SELECT :user_id, :topic_id, :post_number, ft.highest_post_number, :now, :now, :new_status
FROM topics AS ft
JOIN users u on u.id = :user_id
WHERE ft.id = :topic_id
AND NOT EXISTS(SELECT 1
FROM topic_users AS ftu
WHERE ftu.user_id = :user_id and ftu.topic_id = :topic_id)"
def update_last_read(user, topic_id, post_number, msecs, opts={})
return if post_number.blank?
msecs = 0 if msecs.to_i < 0
@ -214,15 +224,18 @@ class TopicUser < ActiveRecord::Base
user.update_posts_read!(post_number, mobile: opts[:mobile])
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)
SELECT :user_id, :topic_id, :post_number, ft.highest_post_number, :now, :now, :new_status
FROM topics AS ft
JOIN users u on u.id = :user_id
WHERE ft.id = :topic_id
AND NOT EXISTS(SELECT 1
FROM topic_users AS ftu
WHERE ftu.user_id = :user_id and ftu.topic_id = :topic_id)",
args)
begin
exec_sql(INSERT_TOPIC_USER_SQL, args)
rescue PG::UniqueViolation
# if record is inserted between two statements this can happen
# we retry once to avoid failing the req
if opts[:retry]
raise
else
opts[:retry] = true
update_last_read(user, topic_id, post_number, msecs, opts)
end
end
MessageBus.publish("/topic/#{topic_id}", { notification_level_change: args[:new_status] }, user_ids: [user.id])
end