Class: Resque::Worker

Inherits:
Object
  • Object
show all
Extended by:
Helpers
Includes:
Helpers, Logging
Defined in:
lib/resque/worker.rb

Overview

A Resque Worker processes jobs. On platforms that support fork(2), the worker will fork off a child to process each job. This ensures a clean slate when beginning the next job and cuts down on gradual memory growth as well as low level failures.

It also ensures workers are always listening to signals from you, their master, and can react accordingly.

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Helpers

classify, constantize, decode, encode, redis

Methods included from Logging

debug, error, fatal, info, log, warn

Constructor Details

#initialize(*queues) ⇒ Worker

Workers should be initialized with an array of string queue names. The order is important: a Worker will check the first queue given for a job. If none is found, it will check the second queue name given. If a job is found, it will be processed. Upon completion, the Worker will again check the first queue given, and so forth. In this way the queue list passed to a Worker on startup defines the priorities of queues.

If passed a single “*”, this Worker will operate on all queues in alphabetical order. Queues can be dynamically added or removed without needing to restart workers using this method.



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# File 'lib/resque/worker.rb', line 96

def initialize(*queues)
  @queues = queues.map { |queue| queue.to_s.strip }
  @shutdown = nil
  @paused = nil
  validate_queues
end

Instance Attribute Details

#cant_fork ⇒ Object

Boolean indicating whether this worker can or can not fork. Automatically set if a fork(2) fails.



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# File 'lib/resque/worker.rb', line 18

def cant_fork
  @cant_fork
end

#run_at_exit_hooks ⇒ Object

When set to true, forked workers will exit with exit, calling any at_exit code handlers that have been registered in the application. Otherwise, forked workers exit with exit!



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# File 'lib/resque/worker.rb', line 27

def run_at_exit_hooks
  @run_at_exit_hooks
end

#term_child ⇒ Object

decide whether to use new_kill_child logic



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# File 'lib/resque/worker.rb', line 23

def term_child
  @term_child
end

#term_timeout ⇒ Object

Returns the value of attribute term_timeout.



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# File 'lib/resque/worker.rb', line 20

def term_timeout
  @term_timeout
end

#to_s ⇒ Object Also known as: id

The string representation is the same as the id for this worker instance. Can be used with Worker.find.



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# File 'lib/resque/worker.rb', line 561

def to_s
  @to_s ||= "#{hostname}:#{pid}:#{@queues.join(',')}"
end

Class Method Details

.all ⇒ Object

Returns an array of all worker objects.



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# File 'lib/resque/worker.rb', line 32

def self.all
  Array(redis.smembers(:workers)).map { |id| find(id) }.compact
end

.attach(worker_id) ⇒ Object

Alias of find



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# File 'lib/resque/worker.rb', line 75

def self.attach(worker_id)
  find(worker_id)
end

.exists?(worker_id) ⇒ Boolean

Given a string worker id, return a boolean indicating whether the worker exists

Returns:

  • (Boolean) 


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# File 'lib/resque/worker.rb', line 81

def self.exists?(worker_id)
  redis.sismember(:workers, worker_id)
end

.find(worker_id) ⇒ Object

Returns a single worker object. Accepts a string id.



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# File 'lib/resque/worker.rb', line 63

def self.find(worker_id)
  if exists? worker_id
    queues = worker_id.split(':')[-1].split(',')
    worker = new(*queues)
    worker.to_s = worker_id
    worker
  else
    nil
  end
end

.working ⇒ Object

Returns an array of all worker objects currently processing jobs.



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# File 'lib/resque/worker.rb', line 38

def self.working
  names = all
  return [] unless names.any?

  names.map! { |name| "worker:#{name}" }

  reportedly_working = {}

  begin
    reportedly_working = redis.mapped_mget(*names).reject do |key, value|
      value.nil? || value.empty?
    end
  rescue Redis::Distributed::CannotDistribute
    names.each do |name|
      value = redis.get name
      reportedly_working[name] = value unless value.nil? || value.empty?
    end
  end

  reportedly_working.keys.map do |key|
    find key.sub("worker:", '')
  end.compact
end

Instance Method Details

#==(other) ⇒ Object

Is this worker the same as another worker?



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# File 'lib/resque/worker.rb', line 551

def ==(other)
  to_s == other.to_s
end

#done_working ⇒ Object

Called when we are done working - clears our working_on state and tells Redis we processed a job.



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# File 'lib/resque/worker.rb', line 487

def done_working
  processed!
  redis.del("worker:#{self}")
end

#enable_gc_optimizations ⇒ Object

Enables GC Optimizations if you’re running REE. www.rubyenterpriseedition.com/faq.html#adapt_apps_for_cow



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# File 'lib/resque/worker.rb', line 292

def enable_gc_optimizations
  if GC.respond_to?(:copy_on_write_friendly=)
    GC.copy_on_write_friendly = true
  end
end

#failed ⇒ Object

How many failed jobs has this worker seen? Returns an int.



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# File 'lib/resque/worker.rb', line 504

def failed
  Stat["failed:#{self}"]
end

#failed! ⇒ Object

Tells Redis we’ve failed a job.



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# File 'lib/resque/worker.rb', line 509

def failed!
  Stat << "failed"
  Stat << "failed:#{self}"
end

#fork(job, &block) ⇒ Object

Not every platform supports fork. Here we do our magic to determine if yours does.



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# File 'lib/resque/worker.rb', line 256

def fork(job,&block)
  return if @cant_fork

  # Only run before_fork hooks if we're actually going to fork
  # (after checking @cant_fork)
  run_hook :before_fork, job

  begin
    # IronRuby doesn't support `Kernel.fork` yet
    if Kernel.respond_to?(:fork)
      Kernel.fork &block if will_fork?
    else
      raise NotImplementedError
    end
  rescue NotImplementedError
    @cant_fork = true
    nil
  end
end

#hostname ⇒ Object

chomp’d hostname of this machine



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# File 'lib/resque/worker.rb', line 567

def hostname
  @hostname ||= `hostname`.chomp
end

#idle? ⇒ Boolean

Boolean - true if idle, false if not

Returns:

  • (Boolean) 


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# File 'lib/resque/worker.rb', line 536

def idle?
  state == :idle
end

#inspect ⇒ Object 



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# File 'lib/resque/worker.rb', line 555

def inspect
  "#<Worker #{to_s}>"
end

#job ⇒ Object Also known as: processing

Returns a hash explaining the Job we’re currently processing, if any.



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# File 'lib/resque/worker.rb', line 525

def job
  decode(redis.get("worker:#{self}")) || {}
end

#kill_child ⇒ Object

Kills the forked child immediately, without remorse. The job it is processing will not be completed.



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# File 'lib/resque/worker.rb', line 362

def kill_child
  if @child
    log! "Killing child at #{@child}"
    if `ps -o pid,state -p #{@child}`
      Process.kill("KILL", @child) rescue nil
    else
      log! "Child #{@child} not found, restarting."
      shutdown
    end
  end
end

#linux_worker_pids ⇒ Object

Find Resque worker pids on Linux and OS X.



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# File 'lib/resque/worker.rb', line 595

def linux_worker_pids
  `ps -A -o pid,command | grep "[r]esque" | grep -v "resque-web"`.split("\n").map do |line|
    line.split(' ')[0]
  end
end

#log(message) ⇒ Object

Log a message to Resque.logger can’t use alias_method since info/debug are private methods



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# File 'lib/resque/worker.rb', line 625

def log(message)
  info(message)
end

#log!(message) ⇒ Object 



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# File 'lib/resque/worker.rb', line 629

def log!(message)
  debug(message)
end

#logger_severity_deprecation_warning ⇒ Object 



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# File 'lib/resque/worker.rb', line 673

def logger_severity_deprecation_warning
  return if $TESTING
  return if $warned_logger_severity_deprecation
  Kernel.warn "*** DEPRECATION WARNING: Resque::Worker#verbose and #very_verbose are deprecated. Please set Resque.logger.level instead"
  Kernel.warn "Called from: #{caller[0..5].join("\n\t")}"
  $warned_logger_severity_deprecation = true
  nil
end

#new_kill_child ⇒ Object

Kills the forked child immediately with minimal remorse. The job it is processing will not be completed. Send the child a TERM signal, wait 5 seconds, and then a KILL signal if it has not quit



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# File 'lib/resque/worker.rb', line 377

def new_kill_child
  if @child
    unless Process.waitpid(@child, Process::WNOHANG)
      log! "Sending TERM signal to child #{@child}"
      Process.kill("TERM", @child)
      (term_timeout.to_f * 10).round.times do |i|
        sleep(0.1)
        return if Process.waitpid(@child, Process::WNOHANG)
      end
      log! "Sending KILL signal to child #{@child}"
      Process.kill("KILL", @child)
    else
      log! "Child #{@child} already quit."
    end
  end
rescue SystemCallError
  log! "Child #{@child} already quit and reaped."
end

#pause_processing ⇒ Object

Stop processing jobs after the current one has completed (if we’re currently running one).



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# File 'lib/resque/worker.rb', line 403

def pause_processing
  log "USR2 received; pausing job processing"
  @paused = true
end

#paused? ⇒ Boolean

are we paused?

Returns:

  • (Boolean) 


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# File 'lib/resque/worker.rb', line 397

def paused?
  @paused
end

#perform(job) ⇒ Object

Processes a given job in the child.



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# File 'lib/resque/worker.rb', line 192

def perform(job)
  begin
    run_hook :after_fork, job if will_fork?
    job.perform
  rescue Object => e
    log "#{job.inspect} failed: #{e.inspect}"
    begin
      job.fail(e)
    rescue Object => e
      log "Received exception when reporting failure: #{e.inspect}"
    end
    failed!
  else
    log "done: #{job.inspect}"
  ensure
    yield job if block_given?
  end
end

#pid ⇒ Object

Returns Integer PID of running worker



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# File 'lib/resque/worker.rb', line 572

def pid
  @pid ||= Process.pid
end

#process(job = nil, &block) ⇒ Object

DEPRECATED. Processes a single job. If none is given, it will try to produce one. Usually run in the child.



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# File 'lib/resque/worker.rb', line 181

def process(job = nil, &block)
  return unless job ||= reserve

  job.worker = self
  working_on job
  perform(job, &block)
ensure
  done_working
end

#processed ⇒ Object

How many jobs has this worker processed? Returns an int.



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# File 'lib/resque/worker.rb', line 493

def processed
  Stat["processed:#{self}"]
end

#processed! ⇒ Object

Tell Redis we’ve processed a job.



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# File 'lib/resque/worker.rb', line 498

def processed!
  Stat << "processed"
  Stat << "processed:#{self}"
end

#procline(string) ⇒ Object

Given a string, sets the procline ($0) and logs. Procline is always in the format of:

resque-VERSION: STRING



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# File 'lib/resque/worker.rb', line 618

def procline(string)
  $0 = "resque-#{Resque::Version}: #{string}"
  log! $0
end

#prune_dead_workers ⇒ Object

Looks for any workers which should be running on this server and, if they’re not, removes them from Redis.

This is a form of garbage collection. If a server is killed by a hard shutdown, power failure, or something else beyond our control, the Resque workers will not die gracefully and therefore will leave stale state information in Redis.

By checking the current Redis state against the actual environment, we can determine if Redis is old and clean it up a bit.



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# File 'lib/resque/worker.rb', line 424

def prune_dead_workers
  all_workers = Worker.all
  known_workers = worker_pids unless all_workers.empty?
  all_workers.each do |worker|
    host, pid, queues = worker.id.split(':')
    next unless host == hostname
    next if known_workers.include?(pid)
    log! "Pruning dead worker: #{worker}"
    worker.unregister_worker
  end
end

#queues ⇒ Object

Returns a list of queues to use when searching for a job. A splat (“*”) means you want every queue (in alpha order) - this can be useful for dynamically adding new queues.



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# File 'lib/resque/worker.rb', line 250

def queues
  @queues.map {|queue| queue == "*" ? Resque.queues.sort : queue }.flatten.uniq
end

#reconnect ⇒ Object

Reconnect to Redis to avoid sharing a connection with the parent, retry up to 3 times with increasing delay before giving up.



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# File 'lib/resque/worker.rb', line 231

def reconnect
  tries = 0
  begin
    redis.client.reconnect
  rescue Redis::BaseConnectionError
    if (tries += 1) <= 3
      log "Error reconnecting to Redis; retrying"
      sleep(tries)
      retry
    else
      log "Error reconnecting to Redis; quitting"
      raise
    end
  end
end

#register_signal_handlers ⇒ Object

Registers the various signal handlers a worker responds to.

TERM: Shutdown immediately, stop processing jobs.

INT: Shutdown immediately, stop processing jobs.

QUIT: Shutdown after the current job has finished processing. USR1: Kill the forked child immediately, continue processing jobs. USR2: Don’t process any new jobs CONT: Start processing jobs again after a USR2



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# File 'lib/resque/worker.rb', line 306

def register_signal_handlers
  trap('TERM') { shutdown!  }
  trap('INT')  { shutdown!  }

  begin
    trap('QUIT') { shutdown   }
    if term_child
      trap('USR1') { new_kill_child }
    else
      trap('USR1') { kill_child }
    end
    trap('USR2') { pause_processing }
    trap('CONT') { unpause_processing }
  rescue ArgumentError
    warn "Signals QUIT, USR1, USR2, and/or CONT not supported."
  end

  log! "Registered signals"
end

#register_worker ⇒ Object

Registers ourself as a worker. Useful when entering the worker lifecycle on startup.



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# File 'lib/resque/worker.rb', line 438

def register_worker
  redis.sadd(:workers, self)
  started!
end

#reserve ⇒ Object

Attempts to grab a job off one of the provided queues. Returns nil if no job can be found.



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# File 'lib/resque/worker.rb', line 213

def reserve
  queues.each do |queue|
    log! "Checking #{queue}"
    if job = Resque.reserve(queue)
      log! "Found job on #{queue}"
      return job
    end
  end

  nil
rescue Exception => e
  log "Error reserving job: #{e.inspect}"
  log e.backtrace.join("\n")
  raise e
end

#run_hook(name, *args) ⇒ Object

Runs a named hook, passing along any arguments.



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# File 'lib/resque/worker.rb', line 444

def run_hook(name, *args)
  return unless hooks = Resque.send(name)
  msg = "Running #{name} hooks"
  msg << " with #{args.inspect}" if args.any?
  log msg

  hooks.each do |hook|
    args.any? ? hook.call(*args) : hook.call
  end
end

#shutdown ⇒ Object

Schedule this worker for shutdown. Will finish processing the current job.



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# File 'lib/resque/worker.rb', line 340

def shutdown
  log 'Exiting...'
  @shutdown = true
end

#shutdown! ⇒ Object

Kill the child and shutdown immediately.



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# File 'lib/resque/worker.rb', line 346

def shutdown!
  shutdown
  if term_child
    new_kill_child
  else
    kill_child
  end
end

#shutdown? ⇒ Boolean

Should this worker shutdown as soon as current job is finished?

Returns:

  • (Boolean) 


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# File 'lib/resque/worker.rb', line 356

def shutdown?
  @shutdown
end

#solaris_worker_pids ⇒ Object

Find Resque worker pids on Solaris.

Returns an Array of string pids of all the other workers on this machine. Useful when pruning dead workers on startup.



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# File 'lib/resque/worker.rb', line 605

def solaris_worker_pids
  `ps -A -o pid,comm | grep "[r]uby" | grep -v "resque-web"`.split("\n").map do |line|
    real_pid = line.split(' ')[0]
    pargs_command = `pargs -a #{real_pid} 2>/dev/null | grep [r]esque | grep -v "resque-web"`
    if pargs_command.split(':')[1] == " resque-#{Resque::Version}"
      real_pid
    end
  end.compact
end

#started ⇒ Object

What time did this worker start? Returns an instance of Time



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# File 'lib/resque/worker.rb', line 515

def started
  redis.get "worker:#{self}:started"
end

#started! ⇒ Object

Tell Redis we’ve started



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# File 'lib/resque/worker.rb', line 520

def started!
  redis.set("worker:#{self}:started", Time.now.to_s)
end

#startup ⇒ Object

Runs all the methods needed when a worker begins its lifecycle.



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# File 'lib/resque/worker.rb', line 277

def startup
  Kernel.warn "WARNING: This way of doing signal handling is now deprecated. Please see http://hone.heroku.com/resque/2012/08/21/resque-signals.html for more info." unless term_child or $TESTING
  enable_gc_optimizations
  register_signal_handlers
  prune_dead_workers
  run_hook :before_first_fork
  register_worker

  # Fix buffering so we can `rake resque:work > resque.log` and
  # get output from the child in there.
  $stdout.sync = true
end

#state ⇒ Object

Returns a symbol representing the current worker state, which can be either :working or :idle



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# File 'lib/resque/worker.rb', line 546

def state
  redis.exists("worker:#{self}") ? :working : :idle
end

#unpause_processing ⇒ Object

Start processing jobs again after a pause



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# File 'lib/resque/worker.rb', line 409

def unpause_processing
  log "CONT received; resuming job processing"
  @paused = false
end

#unregister_signal_handlers ⇒ Object 



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# File 'lib/resque/worker.rb', line 326

def unregister_signal_handlers
  trap('TERM') { raise TermException.new("SIGTERM") }
  trap('INT', 'DEFAULT')

  begin
    trap('QUIT', 'DEFAULT')
    trap('USR1', 'DEFAULT')
    trap('USR2', 'DEFAULT')
  rescue ArgumentError
  end
end

#unregister_worker(exception = nil) ⇒ Object

Unregisters ourself as a worker. Useful when shutting down.



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# File 'lib/resque/worker.rb', line 456

def unregister_worker(exception = nil)
  # If we're still processing a job, make sure it gets logged as a
  # failure.
  if (hash = processing) && !hash.empty?
    job = Job.new(hash['queue'], hash['payload'])
    # Ensure the proper worker is attached to this job, even if
    # it's not the precise instance that died.
    job.worker = self
    job.fail(exception || DirtyExit.new)
  end

  redis.srem(:workers, self)
  redis.del("worker:#{self}")
  redis.del("worker:#{self}:started")

  Stat.clear("processed:#{self}")
  Stat.clear("failed:#{self}")
end

#validate_queues ⇒ Object

A worker must be given a queue, otherwise it won’t know what to do with itself.

You probably never need to call this.



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# File 'lib/resque/worker.rb', line 107

def validate_queues
  if @queues.nil? || @queues.empty?
    raise NoQueueError.new("Please give each worker at least one queue.")
  end
end

#verbose ⇒ Object

Deprecated legacy methods for controlling the logging threshhold Use Resque.logger.level now, e.g.:

Resque.logger.level = Logger::DEBUG



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# File 'lib/resque/worker.rb', line 638

def verbose
  logger_severity_deprecation_warning
  @verbose
end

#verbose=(value) ⇒ Object 



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# File 'lib/resque/worker.rb', line 648

def verbose=(value);
  logger_severity_deprecation_warning

  if value && !very_verbose
    Resque.logger.formatter = VerboseFormatter.new
  elsif !value
    Resque.logger.formatter = QuietFormatter.new
  end

  @verbose = value
end

#very_verbose ⇒ Object 



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# File 'lib/resque/worker.rb', line 643

def very_verbose
  logger_severity_deprecation_warning
  @very_verbose
end

#very_verbose=(value) ⇒ Object 



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# File 'lib/resque/worker.rb', line 660

def very_verbose=(value)
  logger_severity_deprecation_warning
  if value
    Resque.logger.formatter = VeryVerboseFormatter.new
  elsif !value && verbose
    Resque.logger.formatter = VerboseFormatter.new
  else
    Resque.logger.formatter = QuietFormatter.new
  end

  @very_verbose = value
end

#will_fork? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/resque/worker.rb', line 540

def will_fork?
  !@cant_fork && !$TESTING && (ENV["FORK_PER_JOB"] != 'false')
end

#windows_worker_pids ⇒ Object

Returns an Array of string pids of all the other workers on this machine. Useful when pruning dead workers on startup.



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# File 'lib/resque/worker.rb', line 588

def windows_worker_pids
  tasklist_output = `tasklist /FI "IMAGENAME eq ruby.exe" /FO list`.encode("UTF-8", Encoding.locale_charmap)
  tasklist_output.split($/).select { |line| line =~ /^PID:/}.collect{ |line| line.gsub /PID:\s+/, '' }
end

#work(interval = 5.0, &block) ⇒ Object

This is the main workhorse method. Called on a Worker instance, it begins the worker life cycle.

The following events occur during a worker’s life cycle:

  1. Startup: Signals are registered, dead workers are pruned,

    and this worker is registered.

  2. Work loop: Jobs are pulled from a queue and processed.

  3. Teardown: This worker is unregistered.

Can be passed a float representing the polling frequency. The default is 5 seconds, but for a semi-active site you may want to use a smaller value.

Also accepts a block which will be passed the job as soon as it has completed processing. Useful for testing.



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# File 'lib/resque/worker.rb', line 129

def work(interval = 5.0, &block)
  interval = Float(interval)
  $0 = "resque: Starting"
  startup

  loop do
    break if shutdown?

    if not paused? and job = reserve
      log "got: #{job.inspect}"
      job.worker = self
      working_on job

      procline "Processing #{job.queue} since #{Time.now.to_i} [#{job.payload_class}]"
      if @child = fork(job) do
          unregister_signal_handlers if term_child
          reconnect
          perform(job, &block)
          exit! unless run_at_exit_hooks
        end

        srand # Reseeding
        procline "Forked #{@child} at #{Time.now.to_i}"
        begin
          Process.waitpid(@child)
        rescue SystemCallError
          nil
        end
        job.fail(DirtyExit.new($?.to_s)) if $?.signaled?
      else
        reconnect
        perform(job, &block)
      end
      done_working
      @child = nil
    else
      break if interval.zero?
      log! "Sleeping for #{interval} seconds"
      procline paused? ? "Paused" : "Waiting for #{@queues.join(',')}"
      sleep interval
    end
  end

  unregister_worker
rescue Exception => exception
  log "Failed to start worker : #{exception.inspect}"

  unregister_worker(exception)
end

#worker_pids ⇒ Object

Returns an Array of string pids of all the other workers on this machine. Useful when pruning dead workers on startup.



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# File 'lib/resque/worker.rb', line 578

def worker_pids
  if RUBY_PLATFORM =~ /solaris/
    solaris_worker_pids
  else
    linux_worker_pids
  end
end

#working? ⇒ Boolean

Boolean - true if working, false if not

Returns:

  • (Boolean) 


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# File 'lib/resque/worker.rb', line 531

def working?
  state == :working
end

#working_on(job) ⇒ Object

Given a job, tells Redis we’re working on it. Useful for seeing what workers are doing and when.



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# File 'lib/resque/worker.rb', line 477

def working_on(job)
  data = encode \
    :queue   => job.queue,
    :run_at  => Time.now.utc.iso8601,
    :payload => job.payload
  redis.set("worker:#{self}", data)
end