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.

Defined Under Namespace

Classes: Counter, SharedWorkerState

Constant Summary collapse

PROCESSED = 
Counter.new
FAILURE = 
Counter.new
WORKER_STATE = 
SharedWorkerState.new

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Util

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

Methods included from ExceptionHandler

#handle_exception

Constructor Details

#initialize(mgr) ⇒ Processor

Returns a new instance of Processor.



31
32
33
34
35
36
37
38
39
40
41
 
# File 'lib/sidekiq/processor.rb', line 31

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

Instance Attribute Details

#job ⇒ Object (readonly)

Returns the value of attribute job.



29
30
31
 
# File 'lib/sidekiq/processor.rb', line 29

def job
  @job
end

#thread ⇒ Object (readonly)

Returns the value of attribute thread.



28
29
30
 
# File 'lib/sidekiq/processor.rb', line 28

def thread
  @thread
end

Instance Method Details

#constantize(str) ⇒ Object 



267
268
269
270
271
272
273
274
275
276
277
278
 
# File 'lib/sidekiq/processor.rb', line 267

def constantize(str)
  return Object.const_get(str) unless str.include?("::")

  names = str.split("::")
  names.shift if names.empty? || names.first.empty?

  names.inject(Object) do |constant, name|
    # the false flag limits search for name to under the constant namespace
    #   which mimics Rails' behaviour
    constant.const_get(name, false)
  end
end

#dispatch(job_hash, queue, jobstr) ⇒ Object 



114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
 
# File 'lib/sidekiq/processor.rb', line 114

def dispatch(job_hash, queue, jobstr)
  # since middleware can mutate the job hash
  # we need to clone it to report the original
  # job structure to the Web UI
  # or to push back to redis when retrying.
  # To avoid costly and, most of the time, useless cloning here,
  # we pass original String of JSON to respected methods
  # to re-parse it there if we need access to the original, untouched job

  @job_logger.prepare(job_hash) do
    @retrier.global(jobstr, queue) do
      @job_logger.call(job_hash, queue) do
        stats(jobstr, queue) do
          # Rails 5 requires a Reloader to wrap code execution.  In order to
          # constantize the worker and instantiate an instance, we have to call
          # the Reloader.  It handles code loading, db connection management, etc.
          # Effectively this block denotes a "unit of work" to Rails.
          @reloader.call do
            klass = constantize(job_hash["class"])
            worker = klass.new
            worker.jid = job_hash["jid"]
            @retrier.local(worker, jobstr, queue) do
              yield worker
            end
          end
        end
      end
    end
  end
end

#execute_job(worker, cloned_args) ⇒ Object 



195
196
197
 
# File 'lib/sidekiq/processor.rb', line 195

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

#fetch ⇒ Object 



94
95
96
97
98
99
100
101
102
 
# File 'lib/sidekiq/processor.rb', line 94

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

#get_one ⇒ Object 



82
83
84
85
86
87
88
89
90
91
92
 
# File 'lib/sidekiq/processor.rb', line 82

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

#handle_fetch_exception(ex) ⇒ Object 



104
105
106
107
108
109
110
111
112
 
# File 'lib/sidekiq/processor.rb', line 104

def handle_fetch_exception(ex)
  unless @down
    @down = ::Process.clock_gettime(::Process::CLOCK_MONOTONIC)
    logger.error("Error fetching job: #{ex}")
    handle_exception(ex)
  end
  sleep(1)
  nil
end

#kill(wait = false) ⇒ Object 



49
50
51
52
53
54
55
56
57
58
59
 
# File 'lib/sidekiq/processor.rb', line 49

def kill(wait = false)
  @done = true
  return unless @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 



145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
 
# File 'lib/sidekiq/processor.rb', line 145

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

  # Treat malformed JSON as a special case: job goes straight to the morgue.
  job_hash = nil
  begin
    job_hash = Sidekiq.load_json(jobstr)
  rescue => ex
    handle_exception(ex, {context: "Invalid JSON for job", jobstr: jobstr})
    # we can't notify because the job isn't a valid hash payload.
    DeadSet.new.kill(jobstr, notify_failure: false)
    return work.acknowledge
  end

  ack = false
  begin
    dispatch(job_hash, queue, jobstr) do |worker|
      Sidekiq.server_middleware.invoke(worker, job_hash, queue) do
        execute_job(worker, job_hash["args"])
      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.
  rescue Sidekiq::JobRetry::Handled => h
    # this is the common case: job raised error and Sidekiq::JobRetry::Handled
    # signals that we created a retry successfully.  We can acknowlege the job.
    ack = true
    e = h.cause || h
    handle_exception(e, {context: "Job raised exception", job: job_hash, jobstr: jobstr})
    raise e
  rescue Exception => ex
    # Unexpected error!  This is very bad and indicates an exception that got past
    # the retry subsystem (e.g. network partition).  We won't acknowledge the job
    # so it can be rescued when using Sidekiq Pro.
    handle_exception(ex, {context: "Internal exception!", job: job_hash, jobstr: jobstr})
    raise e
  ensure
    if ack
      # We don't want a shutdown signal to interrupt job acknowledgment.
      Thread.handle_interrupt(Sidekiq::Shutdown => :never) do
        work.acknowledge
      end
    end
  end
end

#process_one ⇒ Object 



76
77
78
79
80
 
# File 'lib/sidekiq/processor.rb', line 76

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

#run ⇒ Object 



67
68
69
70
71
72
73
74
 
# File 'lib/sidekiq/processor.rb', line 67

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

#start ⇒ Object 



61
62
63
 
# File 'lib/sidekiq/processor.rb', line 61

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

#stats(jobstr, queue) ⇒ Object 



253
254
255
256
257
258
259
260
261
262
263
264
265
 
# File 'lib/sidekiq/processor.rb', line 253

def stats(jobstr, queue)
  WORKER_STATE.set(tid, {queue: queue, payload: jobstr, run_at: Time.now.to_i})

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

#terminate(wait = false) ⇒ Object 



43
44
45
46
47
 
# File 'lib/sidekiq/processor.rb', line 43

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