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DEV: Use a longer TTL for pg readonly mode.

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This commit is contained in:
Guo Xiang Tan
2020-07-14 16:15:58 +08:00
parent 2196d0b9ae
commit 94a2a70462
2 changed files with 17 additions and 7 deletions
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21
lib/discourse.rb
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@ -431,6 +431,7 @@ module Discourse
READONLY_MODE_KEY_TTL ||= 60
READONLY_MODE_KEY ||= 'readonly_mode'
PG_READONLY_MODE_KEY ||= 'readonly_mode:postgres'
PG_READONLY_MODE_KEY_TTL ||= 300
USER_READONLY_MODE_KEY ||= 'readonly_mode:user'
PG_FORCE_READONLY_MODE_KEY ||= 'readonly_mode:postgres_force'
@ -445,16 +446,24 @@ module Discourse
if key == USER_READONLY_MODE_KEY || key == PG_FORCE_READONLY_MODE_KEY
Discourse.redis.set(key, 1)
else
Discourse.redis.setex(key, READONLY_MODE_KEY_TTL, 1)
keep_readonly_mode(key) if !Rails.env.test?
ttl =
case key
when PG_READONLY_MODE_KEY
PG_READONLY_MODE_KEY_TTL
else
READONLY_MODE_KEY_TTL
end
Discourse.redis.setex(key, ttl, 1)
keep_readonly_mode(key, ttl: ttl) if !Rails.env.test?
end
MessageBus.publish(readonly_channel, true)
true
end
def self.keep_readonly_mode(key)
# extend the expiry by 1 minute every 30 seconds
def self.keep_readonly_mode(key, ttl:)
# extend the expiry by ttl minute every ttl/2 seconds
@mutex ||= Mutex.new
@mutex.synchronize do
@ -465,12 +474,12 @@ module Discourse
unless @threads[key]&.alive?
@threads[key] = Thread.new do
while @dbs.size > 0 do
sleep 30
sleep ttl / 2
@mutex.synchronize do
@dbs.each do |db|
RailsMultisite::ConnectionManagement.with_connection(db) do
if !Discourse.redis.expire(key, READONLY_MODE_KEY_TTL)
if !Discourse.redis.expire(key, ttl)
@dbs.delete(db)
end
end