discourse/lib/sidekiq/pausable.rb

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require 'thread'
class SidekiqPauser
def initialize
@mutex = Mutex.new
end
def pause!
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redis.setex paused_key, 60, "paused"
@mutex.synchronize do
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@extend_lease_thread ||= extend_lease_thread
sleep 0.001 while !paused?
end
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true
end
def paused?
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!!redis.get(paused_key)
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end
def unpause!
@mutex.synchronize do
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@extend_lease_thread = nil
end
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redis.del(paused_key)
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true
end
private
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def extend_lease_thread
Thread.new do
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while true do
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break unless @mutex.synchronize { @extend_lease_thread }
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redis.expire paused_key, 60
sleep 30
end
end
end
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def redis
$redis.without_namespace
end
def paused_key
"sidekiq_is_paused_v2"
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end
end
module Sidekiq
@pauser = SidekiqPauser.new
def self.pause!
@pauser.pause!
end
def self.paused?
@pauser.paused?
end
def self.unpause!
@pauser.unpause!
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?
worker.class.perform_in(@delay, *msg['args'])
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else
yield
end
end
end