Class: Resque::Worker
- Inherits:
-
Object
- Object
- Resque::Worker
- Extended by:
- Helpers
- Includes:
- Helpers
- 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
-
#cant_fork ⇒ Object
Boolean indicating whether this worker can or can not fork.
-
#term_child ⇒ Object
decide whether to use new_kill_child logic.
-
#term_timeout ⇒ Object
Returns the value of attribute term_timeout.
-
#to_s ⇒ Object
(also: #id)
The string representation is the same as the id for this worker instance.
-
#verbose ⇒ Object
Whether the worker should log basic info to STDOUT.
-
#very_verbose ⇒ Object
Whether the worker should log lots of info to STDOUT.
Class Method Summary collapse
-
.all ⇒ Object
Returns an array of all worker objects.
-
.attach(worker_id) ⇒ Object
Alias of ‘find`.
-
.exists?(worker_id) ⇒ Boolean
Given a string worker id, return a boolean indicating whether the worker exists.
-
.find(worker_id) ⇒ Object
Returns a single worker object.
-
.working ⇒ Object
Returns an array of all worker objects currently processing jobs.
Instance Method Summary collapse
-
#==(other) ⇒ Object
Is this worker the same as another worker?.
-
#done_working ⇒ Object
Called when we are done working - clears our ‘working_on` state and tells Redis we processed a job.
-
#enable_gc_optimizations ⇒ Object
Enables GC Optimizations if you’re running REE.
-
#failed ⇒ Object
How many failed jobs has this worker seen? Returns an int.
-
#failed! ⇒ Object
Tells Redis we’ve failed a job.
-
#fork(job) ⇒ Object
Not every platform supports fork.
-
#hostname ⇒ Object
chomp’d hostname of this machine.
-
#idle? ⇒ Boolean
Boolean - true if idle, false if not.
-
#initialize(*queues) ⇒ Worker
constructor
Workers should be initialized with an array of string queue names.
- #inspect ⇒ Object
-
#job ⇒ Object
(also: #processing)
Returns a hash explaining the Job we’re currently processing, if any.
-
#kill_child ⇒ Object
Kills the forked child immediately, without remorse.
-
#linux_worker_pids ⇒ Object
Find Resque worker pids on Linux and OS X.
-
#log(message) ⇒ Object
Log a message to STDOUT if we are verbose or very_verbose.
-
#log!(message) ⇒ Object
Logs a very verbose message to STDOUT.
-
#new_kill_child ⇒ Object
Kills the forked child immediately with minimal remorse.
-
#pause_processing ⇒ Object
Stop processing jobs after the current one has completed (if we’re currently running one).
-
#paused? ⇒ Boolean
are we paused?.
-
#perform(job) ⇒ Object
Processes a given job in the child.
-
#pid ⇒ Object
Returns Integer PID of running worker.
-
#process(job = nil, &block) ⇒ Object
DEPRECATED.
-
#processed ⇒ Object
How many jobs has this worker processed? Returns an int.
-
#processed! ⇒ Object
Tell Redis we’ve processed a job.
-
#procline(string) ⇒ Object
Given a string, sets the procline ($0) and logs.
-
#prune_dead_workers ⇒ Object
Looks for any workers which should be running on this server and, if they’re not, removes them from Redis.
-
#queues ⇒ Object
Returns a list of queues to use when searching for a job.
-
#reconnect ⇒ Object
Reconnect to Redis to avoid sharing a connection with the parent, retry up to 3 times with increasing delay before giving up.
-
#register_signal_handlers ⇒ Object
Registers the various signal handlers a worker responds to.
-
#register_worker ⇒ Object
Registers ourself as a worker.
-
#reserve ⇒ Object
Attempts to grab a job off one of the provided queues.
-
#run_hook(name, *args) ⇒ Object
Runs a named hook, passing along any arguments.
-
#shutdown ⇒ Object
Schedule this worker for shutdown.
-
#shutdown! ⇒ Object
Kill the child and shutdown immediately.
-
#shutdown? ⇒ Boolean
Should this worker shutdown as soon as current job is finished?.
-
#solaris_worker_pids ⇒ Object
Find Resque worker pids on Solaris.
-
#started ⇒ Object
What time did this worker start? Returns an instance of ‘Time`.
-
#started! ⇒ Object
Tell Redis we’ve started.
-
#startup ⇒ Object
Runs all the methods needed when a worker begins its lifecycle.
-
#state ⇒ Object
Returns a symbol representing the current worker state, which can be either :working or :idle.
-
#unpause_processing ⇒ Object
Start processing jobs again after a pause.
- #unregister_signal_handlers ⇒ Object
-
#unregister_worker(exception = nil) ⇒ Object
Unregisters ourself as a worker.
-
#validate_queues ⇒ Object
A worker must be given a queue, otherwise it won’t know what to do with itself.
- #will_fork? ⇒ Boolean
-
#work(interval = 5.0, &block) ⇒ Object
This is the main workhorse method.
-
#worker_pids ⇒ Object
Returns an Array of string pids of all the other workers on this machine.
-
#working? ⇒ Boolean
Boolean - true if working, false if not.
-
#working_on(job) ⇒ Object
Given a job, tells Redis we’re working on it.
Methods included from Helpers
classify, constantize, decode, encode, redis
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 95 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 21 def cant_fork @cant_fork end |
#term_child ⇒ Object
decide whether to use new_kill_child logic
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# File 'lib/resque/worker.rb', line 26 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 23 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 552 def to_s @to_s ||= "#{hostname}:#{Process.pid}:#{@queues.join(',')}" end |
#verbose ⇒ Object
Whether the worker should log basic info to STDOUT
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# File 'lib/resque/worker.rb', line 14 def verbose @verbose end |
#very_verbose ⇒ Object
Whether the worker should log lots of info to STDOUT
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# File 'lib/resque/worker.rb', line 17 def very_verbose @very_verbose end |
Class Method Details
.all ⇒ Object
Returns an array of all worker objects.
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# File 'lib/resque/worker.rb', line 31 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 74 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
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# File 'lib/resque/worker.rb', line 80 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 62 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 37 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 542 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 478 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 285 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 495 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 500 def failed! Stat << "failed" Stat << "failed:#{self}" end |
#fork(job) ⇒ 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 249 def fork(job) 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 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 558 def hostname @hostname ||= `hostname`.chomp end |
#idle? ⇒ Boolean
Boolean - true if idle, false if not
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# File 'lib/resque/worker.rb', line 527 def idle? state == :idle end |
#inspect ⇒ Object
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# File 'lib/resque/worker.rb', line 546 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 516 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 355 def kill_child if @child log! "Killing child at #{@child}" if system("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.
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 581 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 STDOUT if we are verbose or very_verbose.
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# File 'lib/resque/worker.rb', line 610 def log() if verbose puts "*** #{}" elsif very_verbose time = Time.now.strftime('%H:%M:%S %Y-%m-%d') puts "** [#{time}] #$$: #{}" end end |
#log!(message) ⇒ Object
Logs a very verbose message to STDOUT.
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# File 'lib/resque/worker.rb', line 620 def log!() log if very_verbose 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 370 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 396 def pause_processing log "USR2 received; pausing job processing" @paused = true end |
#paused? ⇒ Boolean
are we paused?
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# File 'lib/resque/worker.rb', line 390 def paused? @paused end |
#perform(job) ⇒ Object
Processes a given job in the child.
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# File 'lib/resque/worker.rb', line 185 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 563 def 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 174 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 484 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 489 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 604 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 417 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 243 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 224 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 299 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 431 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 206 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 437 def run_hook(name, *args) return unless hook = Resque.send(name) msg = "Running #{name} hook" msg << " with #{args.inspect}" if args.any? log msg args.any? ? hook.call(*args) : hook.call end |
#shutdown ⇒ Object
Schedule this worker for shutdown. Will finish processing the current job.
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# File 'lib/resque/worker.rb', line 333 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 339 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?
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# File 'lib/resque/worker.rb', line 349 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 591 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 506 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 511 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 270 def startup 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 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 537 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 402 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 319 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 447 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 106 def validate_queues if @queues.nil? || @queues.empty? raise NoQueueError.new("Please give each worker at least one queue.") end end |
#will_fork? ⇒ Boolean
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# File 'lib/resque/worker.rb', line 531 def will_fork? !(@cant_fork || $TESTING) 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:
-
Startup: Signals are registered, dead workers are pruned,
and this worker is registered.
-
Work loop: Jobs are pulled from a queue and processed.
-
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 128 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 if @child = fork(job) srand # Reseeding procline "Forked #{@child} at #{Time.now.to_i}" begin Process.waitpid(@child) rescue SystemCallError nil end else unregister_signal_handlers if will_fork? && term_child procline "Processing #{job.queue} since #{Time.now.to_i}" reconnect perform(job, &block) exit! if will_fork? 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 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 569 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
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# File 'lib/resque/worker.rb', line 522 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 468 def working_on(job) data = encode \ :queue => job.queue, :run_at => Time.now.strftime("%Y/%m/%d %H:%M:%S %Z"), :payload => job.payload redis.set("worker:#{self}", data) end |