Class: Sidekiq::Processor

Inherits:
Object
  • Object
show all
Includes:
Util
Defined in:
lib/sidekiq/processor.rb

Overview

The Processor is a standalone thread which:

  1. fetches a job from Redis

  2. executes the job

a. instantiate the Worker
b. run the middleware chain
c. call #perform

A Processor can exit due to shutdown (processor_stopped) or due to an error during job execution (processor_died)

If an error occurs in the job execution, the Processor calls the Manager to create a new one to replace itself and exits.

Constant Summary collapse

WORKER_STATE = 
Concurrent::Map.new
PROCESSED = 
Concurrent::AtomicFixnum.new
FAILURE = 
Concurrent::AtomicFixnum.new

Constants included from Util

Util::EXPIRY

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Util

#fire_event, #hostname, #identity, #logger, #process_nonce, #redis, #safe_thread, #watchdog

Methods included from ExceptionHandler

#handle_exception

Constructor Details

#initialize(mgr) ⇒ Processor

Returns a new instance of Processor.



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# File 'lib/sidekiq/processor.rb', line 32

def initialize(mgr)
  @mgr = mgr
  @down = false
  @done = false
  @job = nil
  @thread = nil
  @strategy = (mgr.options[:fetch] || Sidekiq::BasicFetch).new(mgr.options)
end

Instance Attribute Details

#job ⇒ Object (readonly)

Returns the value of attribute job.



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# File 'lib/sidekiq/processor.rb', line 30

def job
  @job
end

#thread ⇒ Object (readonly)

Returns the value of attribute thread.



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# File 'lib/sidekiq/processor.rb', line 29

def thread
  @thread
end

Instance Method Details

#cloned(ary) ⇒ Object

Deep clone the arguments passed to the worker so that if the job fails, what is pushed back onto Redis hasn’t been mutated by the worker.



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# File 'lib/sidekiq/processor.rb', line 181

def cloned(ary)
  Marshal.load(Marshal.dump(ary))
end

#execute_job(worker, cloned_args) ⇒ Object 



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# File 'lib/sidekiq/processor.rb', line 151

def execute_job(worker, cloned_args)
  worker.perform(*cloned_args)
end

#fetch ⇒ Object 



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# File 'lib/sidekiq/processor.rb', line 95

def fetch
  j = get_one
  if j && @done
    j.requeue
    nil
  else
    j
  end
end

#get_one ⇒ Object 



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# File 'lib/sidekiq/processor.rb', line 84

def get_one
  begin
    work = @strategy.retrieve_work
    (logger.info { "Redis is online, #{Time.now - @down} sec downtime" }; @down = nil) if @down
    work
  rescue Sidekiq::Shutdown
  rescue => ex
    handle_fetch_exception(ex)
  end
end

#handle_fetch_exception(ex) ⇒ Object 



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# File 'lib/sidekiq/processor.rb', line 105

def handle_fetch_exception(ex)
  if !@down
    @down = Time.now
    logger.error("Error fetching job: #{ex}")
    ex.backtrace.each do |bt|
      logger.error(bt)
    end
  end
  sleep(1)
  nil
end

#kill(wait = false) ⇒ Object 



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# File 'lib/sidekiq/processor.rb', line 47

def kill(wait=false)
  @done = true
  return if !@thread
  # unlike the other actors, terminate does not wait
  # for the thread to finish because we don't know how
  # long the job will take to finish.  Instead we
  # provide a `kill` method to call after the shutdown
  # timeout passes.
  @thread.raise ::Sidekiq::Shutdown
  @thread.value if wait
end

#process(work) ⇒ Object 



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# File 'lib/sidekiq/processor.rb', line 117

def process(work)
  jobstr = work.job
  queue = work.queue_name

  ack = false
  begin
    job = Sidekiq.load_json(jobstr)
    klass  = job['class'.freeze].constantize
    worker = klass.new
    worker.jid = job['jid'.freeze]

    stats(worker, job, queue) do
      Sidekiq.server_middleware.invoke(worker, job, queue) do
        # Only ack if we either attempted to start this job or
        # successfully completed it. This prevents us from
        # losing jobs if a middleware raises an exception before yielding
        ack = true
        execute_job(worker, cloned(job['args'.freeze]))
      end
    end
    ack = true
  rescue Sidekiq::Shutdown
    # Had to force kill this job because it didn't finish
    # within the timeout.  Don't acknowledge the work since
    # we didn't properly finish it.
    ack = false
  rescue Exception => ex
    handle_exception(ex, job || { :job => jobstr })
    raise
  ensure
    work.acknowledge if ack
  end
end

#process_one ⇒ Object 



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# File 'lib/sidekiq/processor.rb', line 78

def process_one
  @job = fetch
  process(@job) if @job
  @job = nil
end

#run ⇒ Object 



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# File 'lib/sidekiq/processor.rb', line 65

def run
  begin
    while !@done
      process_one
    end
    @mgr.processor_stopped(self)
  rescue Sidekiq::Shutdown
    @mgr.processor_stopped(self)
  rescue Exception => ex
    @mgr.processor_died(self, ex)
  end
end

#start ⇒ Object 



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# File 'lib/sidekiq/processor.rb', line 59

def start
  @thread ||= safe_thread("processor", &method(:run))
end

#stats(worker, job, queue) ⇒ Object 



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# File 'lib/sidekiq/processor.rb', line 163

def stats(worker, job, queue)
  tid = thread_identity
  WORKER_STATE[tid] = {:queue => queue, :payload => job, :run_at => Time.now.to_i }

  begin
    yield
  rescue Exception
    FAILURE.increment
    raise
  ensure
    WORKER_STATE.delete(tid)
    PROCESSED.increment
  end
end

#terminate(wait = false) ⇒ Object 



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# File 'lib/sidekiq/processor.rb', line 41

def terminate(wait=false)
  @done = true
  return if !@thread
  @thread.value if wait
end

#thread_identity ⇒ Object 



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# File 'lib/sidekiq/processor.rb', line 155

def thread_identity
  @str ||= Thread.current.object_id.to_s(36)
end