Class: Delayed::Worker
- Inherits:
-
Object
- Object
- Delayed::Worker
- Defined in:
- lib/delayed/worker.rb
Overview
rubocop:disable ClassLength
Constant Summary collapse
- DEFAULT_LOG_LEVEL =
'info'
- DEFAULT_SLEEP_DELAY =
5
- DEFAULT_MAX_ATTEMPTS =
25
- DEFAULT_MAX_RUN_TIME =
4.hours
- DEFAULT_DEFAULT_PRIORITY =
0
- DEFAULT_DELAY_JOBS =
true
- DEFAULT_QUEUES =
[]
- DEFAULT_READ_AHEAD =
5
Instance Attribute Summary collapse
-
#name ⇒ Object
Every worker has a unique name which by default is the pid of the process.
-
#name_prefix ⇒ Object
name_prefix is ignored if name is set directly.
Class Method Summary collapse
- .after_fork ⇒ Object
- .backend=(backend) ⇒ Object
- .before_fork ⇒ Object
- .delay_job?(job) ⇒ Boolean
- .guess_backend ⇒ Object
- .lifecycle ⇒ Object
- .reload_app? ⇒ Boolean
- .reset ⇒ Object
- .setup_lifecycle ⇒ Object
Instance Method Summary collapse
- #failed(job) ⇒ Object
-
#initialize(options = {}) ⇒ Worker
constructor
A new instance of Worker.
- #job_say(job, text, level = default_log_level) ⇒ Object
- #max_attempts(job) ⇒ Object
- #max_run_time(job) ⇒ Object
-
#reschedule(job, time = nil) ⇒ Object
Reschedule the job in the future (when a job fails).
- #run(job) ⇒ Object
- #say(text, level = default_log_level) ⇒ Object
-
#start ⇒ Object
rubocop:disable CyclomaticComplexity, PerceivedComplexity.
- #stop ⇒ Object
- #stop? ⇒ Boolean
-
#work_off(num = 100) ⇒ Object
Do num jobs and return stats on success/failure.
Constructor Details
#initialize(options = {}) ⇒ Worker
Returns a new instance of Worker.
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# File 'lib/delayed/worker.rb', line 124 def initialize( = {}) @quiet = .key?(:quiet) ? [:quiet] : true @failed_reserve_count = 0 [:min_priority, :max_priority, :sleep_delay, :read_ahead, :queues, :exit_on_complete].each do |option| self.class.send("#{option}=", [option]) if .key?(option) end # Reset lifecycle on the offhand chance that something lazily # triggered its creation before all plugins had been registered. self.class.setup_lifecycle end |
Instance Attribute Details
#name ⇒ Object
Every worker has a unique name which by default is the pid of the process. There are some advantages to overriding this with something which survives worker restarts: Workers can safely resume working on tasks which are locked by themselves. The worker will assume that it crashed before.
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# File 'lib/delayed/worker.rb', line 141 def name return @name unless @name.nil? "#{@name_prefix}host:#{Socket.gethostname} pid:#{Process.pid}" rescue "#{@name_prefix}pid:#{Process.pid}" end |
#name_prefix ⇒ Object
name_prefix is ignored if name is set directly
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# File 'lib/delayed/worker.rb', line 31 def name_prefix @name_prefix end |
Class Method Details
.after_fork ⇒ Object
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# File 'lib/delayed/worker.rb', line 88 def self.after_fork # Re-open file handles @files_to_reopen.each do |file| begin file.reopen file.path, 'a+' file.sync = true rescue ::Exception # rubocop:disable HandleExceptions, RescueException end end backend.after_fork end |
.backend=(backend) ⇒ Object
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# File 'lib/delayed/worker.rb', line 63 def self.backend=(backend) if backend.is_a? Symbol require "delayed/serialization/#{backend}" require "delayed/backend/#{backend}" backend = "Delayed::Backend::#{backend.to_s.classify}::Job".constantize end @@backend = backend # rubocop:disable ClassVars silence_warnings { ::Delayed.const_set(:Job, backend) } end |
.before_fork ⇒ Object
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# File 'lib/delayed/worker.rb', line 77 def self.before_fork unless @files_to_reopen @files_to_reopen = [] ObjectSpace.each_object(File) do |file| @files_to_reopen << file unless file.closed? end end backend.before_fork end |
.delay_job?(job) ⇒ Boolean
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# File 'lib/delayed/worker.rb', line 116 def self.delay_job?(job) if delay_jobs.is_a?(Proc) delay_jobs.arity == 1 ? delay_jobs.call(job) : delay_jobs.call else delay_jobs end end |
.guess_backend ⇒ Object
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# File 'lib/delayed/worker.rb', line 73 def self.guess_backend warn '[DEPRECATION] guess_backend is deprecated. Please remove it from your code.' end |
.lifecycle ⇒ Object
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# File 'lib/delayed/worker.rb', line 100 def self.lifecycle # In case a worker has not been set up, job enqueueing needs a lifecycle. setup_lifecycle unless @lifecycle @lifecycle end |
.reload_app? ⇒ Boolean
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# File 'lib/delayed/worker.rb', line 112 def self.reload_app? defined?(ActionDispatch::Reloader) && Rails.application.config.cache_classes == false end |
.reset ⇒ Object
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# File 'lib/delayed/worker.rb', line 33 def self.reset self.default_log_level = DEFAULT_LOG_LEVEL self.sleep_delay = DEFAULT_SLEEP_DELAY self.max_attempts = DEFAULT_MAX_ATTEMPTS self.max_run_time = DEFAULT_MAX_RUN_TIME self.default_priority = DEFAULT_DEFAULT_PRIORITY self.delay_jobs = DEFAULT_DELAY_JOBS self.queues = DEFAULT_QUEUES self.read_ahead = DEFAULT_READ_AHEAD @lifecycle = nil end |
Instance Method Details
#failed(job) ⇒ Object
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# File 'lib/delayed/worker.rb', line 251 def failed(job) self.class.lifecycle.run_callbacks(:failure, self, job) do begin job.hook(:failure) rescue => error say "Error when running failure callback: #{error}", 'error' say error.backtrace.join("\n"), 'error' ensure job.destroy_failed_jobs? ? job.destroy : job.fail! end end end |
#job_say(job, text, level = default_log_level) ⇒ Object
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# File 'lib/delayed/worker.rb', line 264 def job_say(job, text, level = default_log_level) text = "Job #{job.name} (id=#{job.id}) #{text}" say text, level end |
#max_attempts(job) ⇒ Object
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# File 'lib/delayed/worker.rb', line 280 def max_attempts(job) job.max_attempts || self.class.max_attempts end |
#max_run_time(job) ⇒ Object
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# File 'lib/delayed/worker.rb', line 284 def max_run_time(job) job.max_run_time || self.class.max_run_time end |
#reschedule(job, time = nil) ⇒ Object
Reschedule the job in the future (when a job fails). Uses an exponential scale depending on the number of failed attempts.
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# File 'lib/delayed/worker.rb', line 239 def reschedule(job, time = nil) if (job.attempts += 1) < max_attempts(job) time ||= job.reschedule_at job.run_at = time job.unlock job.save! else job_say job, "REMOVED permanently because of #{job.attempts} consecutive failures", 'error' failed(job) end end |
#run(job) ⇒ Object
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# File 'lib/delayed/worker.rb', line 221 def run(job) job_say job, 'RUNNING' runtime = Benchmark.realtime do Timeout.timeout(max_run_time(job).to_i, WorkerTimeout) { job.invoke_job } job.destroy end job_say job, format('COMPLETED after %.4f', runtime) return true # did work rescue DeserializationError => error job.error = error failed(job) rescue Exception => error # rubocop:disable RescueException self.class.lifecycle.run_callbacks(:error, self, job) { handle_failed_job(job, error) } return false # work failed end |
#say(text, level = default_log_level) ⇒ Object
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# File 'lib/delayed/worker.rb', line 269 def say(text, level = default_log_level) text = "[Worker(#{name})] #{text}" puts text unless @quiet return unless logger # TODO: Deprecate use of Fixnum log levels unless level.is_a?(String) level = Logger::Severity.constants.detect { |i| Logger::Severity.const_get(i) == level }.to_s.downcase end logger.send(level, "#{Time.now.strftime('%FT%T%z')}: #{text}") end |
#start ⇒ Object
rubocop:disable CyclomaticComplexity, PerceivedComplexity
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# File 'lib/delayed/worker.rb', line 150 def start # rubocop:disable CyclomaticComplexity, PerceivedComplexity trap('TERM') do Thread.new { say 'Exiting...' } stop raise SignalException, 'TERM' if self.class.raise_signal_exceptions end trap('INT') do Thread.new { say 'Exiting...' } stop raise SignalException, 'INT' if self.class.raise_signal_exceptions && self.class.raise_signal_exceptions != :term end say 'Starting job worker' self.class.lifecycle.run_callbacks(:execute, self) do loop do self.class.lifecycle.run_callbacks(:loop, self) do @realtime = Benchmark.realtime do @result = work_off end end count = @result.sum if count.zero? if self.class.exit_on_complete say 'No more jobs available. Exiting' break elsif !stop? sleep(self.class.sleep_delay) reload! end else say format("#{count} jobs processed at %.4f j/s, %d failed", count / @realtime, @result.last) end break if stop? end end end |
#stop ⇒ Object
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# File 'lib/delayed/worker.rb', line 192 def stop @exit = true end |
#stop? ⇒ Boolean
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# File 'lib/delayed/worker.rb', line 196 def stop? !!@exit end |
#work_off(num = 100) ⇒ Object
Do num jobs and return stats on success/failure. Exit early if interrupted.
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# File 'lib/delayed/worker.rb', line 202 def work_off(num = 100) success = 0 failure = 0 num.times do case reserve_and_run_one_job when true success += 1 when false failure += 1 else break # leave if no work could be done end break if stop? # leave if we're exiting end [success, failure] end |