discourse/lib/sidekiq/pausable.rb

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# frozen_string_literal: true
require 'thread'
class SidekiqPauser
TTL = 60
PAUSED_KEY = "sidekiq_is_paused_v2"
def initialize
@mutex = Mutex.new
@dbs ||= Set.new
end
def pause!(value = "paused")
Discourse.redis.setex PAUSED_KEY, TTL, value
extend_lease_thread
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true
end
def paused?
!!Discourse.redis.get(PAUSED_KEY)
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end
def unpause_all!
@mutex.synchronize do
@dbs = Set.new
stop_extend_lease_thread
end
RailsMultisite::ConnectionManagement.each_connection do
unpause! if paused?
end
end
def paused_dbs
dbs = []
RailsMultisite::ConnectionManagement.each_connection do
dbs << RailsMultisite::ConnectionManagement.current_db if paused?
end
dbs
end
def unpause!
@mutex.synchronize do
@dbs.delete(RailsMultisite::ConnectionManagement.current_db)
stop_extend_lease_thread if @dbs.size == 0
end
Discourse.redis.del(PAUSED_KEY)
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true
end
private
def stop_extend_lease_thread
# should always be called from a mutex
if t = @extend_lease_thread
@extend_lease_thread = nil
while t.alive?
begin
t.wakeup
rescue ThreadError => e
unless e.message =~ /killed thread/
raise e
end
end
sleep 0
end
end
end
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def extend_lease_thread
@mutex.synchronize do
@dbs << RailsMultisite::ConnectionManagement.current_db
@extend_lease_thread ||= Thread.new do
while true do
break if !@extend_lease_thread
@mutex.synchronize do
@dbs.each do |db|
RailsMultisite::ConnectionManagement.with_connection(db) do
if !Discourse.redis.expire(PAUSED_KEY, TTL)
# if it was unpaused in another process we got to remove the
# bad key
@dbs.delete(db)
end
end
end
end
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sleep(Rails.env.test? ? 0.01 : TTL / 2)
end
end
end
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end
end
module Sidekiq
@pauser = SidekiqPauser.new
def self.pause!(key = nil)
key ? @pauser.pause!(key) : @pauser.pause!
end
def self.paused?
@pauser.paused?
end
def self.unpause!
@pauser.unpause!
end
def self.unpause_all!
@pauser.unpause_all!
end
def self.paused_dbs
@pauser.paused_dbs
end
end
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# server middleware that will reschedule work whenever Sidekiq is paused
class Sidekiq::Pausable
def initialize(delay = 5.seconds)
@delay = delay
end
def call(worker, msg, queue)
if sidekiq_paused?(msg) && !(Jobs::RunHeartbeat === worker)
worker.class.perform_in(@delay, *msg['args'])
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else
start = Process.clock_gettime(Process::CLOCK_MONOTONIC)
result = yield
duration = Process.clock_gettime(Process::CLOCK_MONOTONIC) - start
DiscourseEvent.trigger(:sidekiq_job_ran, worker, msg, queue, duration)
result
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end
end
private
def sidekiq_paused?(msg)
if site_id = msg["args"]&.first&.dig("current_site_id")
RailsMultisite::ConnectionManagement.with_connection(site_id) do
Sidekiq.paused?
end
end
end
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end