class Delayed::Worker
Public Class Methods
after_fork()
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# File lib/delayed/worker.rb, line 87 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)
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# File lib/delayed/worker.rb, line 62 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()
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# File lib/delayed/worker.rb, line 76 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
guess_backend()
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# File lib/delayed/worker.rb, line 72 def self.guess_backend warn '[DEPRECATION] guess_backend is deprecated. Please remove it from your code.' end
lifecycle()
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# File lib/delayed/worker.rb, line 99 def self.lifecycle @lifecycle ||= Delayed::Lifecycle.new end
new(options = {})
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# File lib/delayed/worker.rb, line 107 def initialize(options = {}) @quiet = options.key?(:quiet) ? options[: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}=", options[option]) if options.key?(option) end plugins.each { |klass| klass.new } end
reload_app?()
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# File lib/delayed/worker.rb, line 103 def self.reload_app? defined?(ActionDispatch::Reloader) && Rails.application.config.cache_classes == false end
reset()
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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 end
Public Instance Methods
failed(job)
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# File lib/delayed/worker.rb, line 231 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 self.class.destroy_failed_jobs ? job.destroy : job.fail! end end end
job_say(job, text, level = default_log_level)
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# File lib/delayed/worker.rb, line 244 def job_say(job, text, level = default_log_level) text = "Job #{job.name} (id=#{job.id}) #{text}" say text, level end
max_attempts(job)
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# File lib/delayed/worker.rb, line 260 def max_attempts(job) job.max_attempts || self.class.max_attempts end
max_run_time(job)
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# File lib/delayed/worker.rb, line 264 def max_run_time(job) job.max_run_time || self.class.max_run_time end
name()
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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.
# File lib/delayed/worker.rb, line 122 def name return @name unless @name.nil? "#{@name_prefix}host:#{Socket.gethostname} pid:#{Process.pid}" rescue "#{@name_prefix}pid:#{Process.pid}" # rubocop:disable RescueModifier end
reschedule(job, time = nil)
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Reschedule the job in the future (when a job fails). Uses an exponential scale depending on the number of failed attempts.
# File lib/delayed/worker.rb, line 219 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)
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# File lib/delayed/worker.rb, line 201 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.last_error = "#{error.message}\n#{error.backtrace.join("\n")}" failed(job) rescue => error self.class.lifecycle.run_callbacks(:error, self, job) { handle_failed_job(job, error) } return false # work failed end
say(text, level = default_log_level)
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# File lib/delayed/worker.rb, line 249 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()
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# File lib/delayed/worker.rb, line 131 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()
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# File lib/delayed/worker.rb, line 173 def stop @exit = true end
stop?()
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# File lib/delayed/worker.rb, line 177 def stop? !!@exit end
work_off(num = 100)
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Do num jobs and return stats on success/failure. Exit early if interrupted.
# File lib/delayed/worker.rb, line 183 def work_off(num = 100) success, failure = 0, 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
Protected Instance Methods
handle_failed_job(job, error)
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# File lib/delayed/worker.rb, line 270 def handle_failed_job(job, error) job.last_error = "#{error.message}\n#{error.backtrace.join("\n")}" job_say job, "FAILED (#{job.attempts} prior attempts) with #{error.class.name}: #{error.message}", 'error' reschedule(job) end
reload!()
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# File lib/delayed/worker.rb, line 295 def reload! return unless self.class.reload_app? ActionDispatch::Reloader.cleanup! ActionDispatch::Reloader.prepare! end
reserve_and_run_one_job()
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Run the next job we can get an exclusive lock on. If no jobs are left we return nil
# File lib/delayed/worker.rb, line 278 def reserve_and_run_one_job job = reserve_job self.class.lifecycle.run_callbacks(:perform, self, job) { run(job) } if job end
reserve_job()
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# File lib/delayed/worker.rb, line 283 def reserve_job job = Delayed::Job.reserve(self) @failed_reserve_count = 0 job rescue ::Exception => error # rubocop:disable RescueException say "Error while reserving job: #{error}" Delayed::Job.recover_from(error) @failed_reserve_count += 1 raise FatalBackendError if @failed_reserve_count >= 10 nil end