Worker::pause() - Code Metrics - scones/resque - Measure and Improve Code Quality continuously with Scrutinizer

Worker::pause() A
last analyzed 2019-05-28 12:05 UTC

↳ Parent: Worker

Complexity

Conditions	1
Paths	1

Size

Total Lines	3
Code Lines	1

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	2
CRAP Score	1

Importance

Changes

Metric	Value
eloc	1
dl	0
loc	3
ccs	2
cts	2
cp	1
rs	10
c	0
b	0
f	0
cc	1
nc	1
nop	0
crap	1

<?php

declare(strict_types=1);

namespace Resque;

use Psr\Container\ContainerInterface;
use Resque\Dispatchers\Noop;
use Resque\Interfaces\Dispatcher;
use Resque\Interfaces\Serializer;
use Resque\Tasks\ForkFailed;
use Resque\Tasks\JobFailed;
use Resque\Tasks\ParentWaiting;
use Resque\Tasks\UnknownChildFailure;
use Resque\Tasks\WorkerDoneWorking;
use Resque\Tasks\WorkerIdle;
use Resque\Tasks\WorkerRegistering;
use Resque\Tasks\WorkerStartup;
use Resque\Tasks\WorkerUnregistering;

class Worker
{
    private const FORK_FAILED = -1;
    private const FORK_CHILD = 0;

    private $datastore;
    private $serializer;
    private $queueNames = ['default'];
    private $interval = 10;
    private $shouldShutdown = false;
    private $isPaused = false;
    private $isChildThread = false;
    private $childId = 0;
    private $serviceLocator;
    private $dispatcher = null;
    private $id;
    private $signalHandler;

    public function __construct(
        Datastore $datastore,
        Serializer $serializer,
        ContainerInterface $serviceLocator,
        SignalHandler $signalHandler
    ) {
        $this->datastore = $datastore;
        $this->serializer = $serializer;
        $this->serviceLocator = $serviceLocator;
        $this->signalHandler = $signalHandler;
        $this->dispatcher = new Noop();

        $this->id = gethostname() . '-' . getmypid() . md5(random_bytes(2));
    }

    public function setInterval(int $interval): void
    {
        $this->interval = $interval;
    }

    public function setQueueNames(array $queueNames): void
    {
        $this->queueNames = $queueNames;
    }

    public function setDispatcher(Dispatcher $dispatcher): void
    {
        $this->dispatcher = $dispatcher;
    }

    public function work(): void
    {
        $this->startup();

        do {
            if ($this->isPaused || !$this->workOneJob()) {
                $this->dispatcher->dispatch(WorkerIdle::class, ['worker' => $this]);
                sleep($this->interval);
            }
        } while (0 < $this->interval && !$this->shouldShutdown);

        $this->unregisterWorker();
    }

    private function startup(): void
    {
        $this->signalHandler->setWorker($this);
        $this->signalHandler->register();
        $this->dispatcher->dispatch(WorkerStartup::class, ['worker' => $this]);
        $this->registerWorker();
    }

    private function registerWorker(): void
    {
        $this->dispatcher->dispatch(WorkerRegistering::class, ['worker' => $this]);
        $this->datastore->registerWorker($this->id);
    }

    private function unregisterWorker(): void
    {
        $this->dispatcher->dispatch(WorkerUnregistering::class, ['worker' => $this]);
        $this->datastore->unregisterWorker($this->id);
    }

    private function workOneJob(): bool
    {
        $job = $this->fetchJob();
        if (empty($job)) {
            return false;
        }

        $this->setWorkingOn($job);
        $this->performWithFork($job);

        return true;
    }

    private function fetchJob(): ?Job
    {
        foreach ($this->queueNames as $queueName) {
            $payload = $this->datastore->popFromQueue($queueName);
            if (!empty($payload)) {
                return $this->createJobFromPayload($queueName, $payload);
            }
        }
        return null;
    }

    private function setWorkingOn(Job $job): void
    {
        $time = new \DateTime();
        $time->setTimezone(new \DateTimeZone('UTC'));
        $timeString = $time->format(\DateTime::ISO8601);
        $workerPayload = $this->serializer->serialize([
            'queue' => $job->getQueueName(),
            'run_at' => $timeString,
            'payload' => $job->getPayload(),
        ]);
        $this->datastore->setWorkerPayload($this->id, $workerPayload);
    }

    private function performWithFork(Job $job): void
    {
        $this->childId = pcntl_fork();

        switch ($this->childId) {

            case self::FORK_FAILED:
                $this->dispatcher->dispatch(ForkFailed::class, ['worker' => $this, 'job' => $job]);
                $this->criticalWorkerShutdown($job);
                break;

            case self::FORK_CHILD:
                $this->performJob($job);
                $this->shouldShutdown = true;
                $this->isChildThread = true;
                break;

            default: // parent case
                $this->dispatcher->dispatch(ParentWaiting::class, ['worker' => $this]);
                $this->waitForChild($job);
        }

        $this->childId = null;
        $this->doneWorking();
    }

    private function doneWorking(): void
    {
        if (!$this->isChildThread) {
            $this->dispatcher->dispatch(WorkerDoneWorking::class, ['worker' => $this]);
        }
    }

    private function createJobFromPayload(string $queueName, string $serializedPayload): Job
    {
        $payload = $this->serializer->unserialize($serializedPayload);
        $factory = $this->serviceLocator->get(Job::class);
        return $factory($queueName, $payload, $this->serviceLocator);
    }

    public function criticalWorkerShutdown(Job $job): void
    {
        $this->requeueJob($job);
        $this->shutdown();
    }

    private function requeueJob(Job $job): void
    {
        $payload = $this->createPayloadFromJob($job);
        $this->datastore->pushToQueue($job->getQueueName(), $payload);
    }

    private function createPayloadFromJob($job): string
    {
        return $this->serializer->serialize($job->getPayload());
    }

    private function performJob(Job $job): void
    {
        $this->datastore->reconnect();
        $job->perform();
    }

    private function waitForChild(Job $job): void
    {
        $status = null;
        $exitCode = null;
        pcntl_wait($status);
        if (!pcntl_wifexited($status) || 0 !== ($exitCode = pcntl_wexitstatus($status))) {
            if ($job->hasFailed()) {
                $this->dispatcher->dispatch(JobFailed::class, ['worker' => $this, 'job' => $job, 'status' => $status, 'exit_code' => $exitCode]);
            } else {
                $this->dispatcher->dispatch(UnknownChildFailure::class, ['worker' => $this, 'job' => $job, 'status' => $status, 'exit_code' => $exitCode]);
                $this->shutdown();
            }
        }
    }

    public function shutdown(): void
    {
        $this->shouldShutdown = true;
    }

    public function forceShutdown(): void
    {
        $this->shouldShutdown = true;
        if (!empty($this->childId)) {
            posix_kill($this->childId, SIGTERM) || posix_kill($this->childId, SIGKILL);
        }
    }

    public function pause(): void
    {
        $this->isPaused = true;
    }

    public function continue()
    {
        $this->isPaused = false;
    }
}


1		<?php
2
3		declare(strict_types=1);
4
5		namespace Resque;
6
7		use Psr\Container\ContainerInterface;
8		use Resque\Dispatchers\Noop;
9		use Resque\Interfaces\Dispatcher;
10		use Resque\Interfaces\Serializer;
11		use Resque\Tasks\ForkFailed;
12		use Resque\Tasks\JobFailed;
13		use Resque\Tasks\ParentWaiting;
14		use Resque\Tasks\UnknownChildFailure;
15		use Resque\Tasks\WorkerDoneWorking;
16		use Resque\Tasks\WorkerIdle;
17		use Resque\Tasks\WorkerRegistering;
18		use Resque\Tasks\WorkerStartup;
19		use Resque\Tasks\WorkerUnregistering;
20
21		class Worker
22		{
23		private const FORK_FAILED = -1;
24		private const FORK_CHILD = 0;
25
26		private $datastore;
27		private $serializer;
28		private $queueNames = ['default'];
29		private $interval = 10;
30		private $shouldShutdown = false;
31		private $isPaused = false;
32		private $isChildThread = false;
33		private $childId = 0;
34		private $serviceLocator;
35		private $dispatcher = null;
36		private $id;
37		private $signalHandler;
38
39	13	public function __construct(
40		Datastore $datastore,
41		Serializer $serializer,
42		ContainerInterface $serviceLocator,
43		SignalHandler $signalHandler
44		) {
45	13	$this->datastore = $datastore;
46	13	$this->serializer = $serializer;
47	13	$this->serviceLocator = $serviceLocator;
48	13	$this->signalHandler = $signalHandler;
49	13	$this->dispatcher = new Noop();
50
51	13	$this->id = gethostname() . '-' . getmypid() . md5(random_bytes(2));
52	13	}
53
54	13	public function setInterval(int $interval): void
55		{
56	13	$this->interval = $interval;
57	13	}
58
59	13	public function setQueueNames(array $queueNames): void
60		{
61	13	$this->queueNames = $queueNames;
62	13	}
63
64	13	public function setDispatcher(Dispatcher $dispatcher): void
65		{
66	13	$this->dispatcher = $dispatcher;
67	13	}
68
69	8	public function work(): void
70		{
71	8	$this->startup();
72
73		do {
74	8	if ($this->isPaused \|\| !$this->workOneJob()) {
75	1	$this->dispatcher->dispatch(WorkerIdle::class, ['worker' => $this]);
76	1	sleep($this->interval);
77		}
78	8	} while (0 < $this->interval && !$this->shouldShutdown);
79
80	8	$this->unregisterWorker();
81	8	}
82
83	8	private function startup(): void
84		{
85	8	$this->signalHandler->setWorker($this);
86	8	$this->signalHandler->register();
87	8	$this->dispatcher->dispatch(WorkerStartup::class, ['worker' => $this]);
88	8	$this->registerWorker();
89	8	}
90
91	8	private function registerWorker(): void
92		{
93	8	$this->dispatcher->dispatch(WorkerRegistering::class, ['worker' => $this]);
94	8	$this->datastore->registerWorker($this->id);
95	8	}
96
97	8	private function unregisterWorker(): void
98		{
99	8	$this->dispatcher->dispatch(WorkerUnregistering::class, ['worker' => $this]);
100	8	$this->datastore->unregisterWorker($this->id);
101	8	}
102
103	8	private function workOneJob(): bool
104		{
105	8	$job = $this->fetchJob();
106	8	if (empty($job)) {
107	1	return false;
108		}
109
110	7	$this->setWorkingOn($job);
111	7	$this->performWithFork($job);
112
113	7	return true;
114		}
115
116	8	private function fetchJob(): ?Job
117		{
118	8	foreach ($this->queueNames as $queueName) {
119	8	$payload = $this->datastore->popFromQueue($queueName);
120	8	if (!empty($payload)) {
121	8	return $this->createJobFromPayload($queueName, $payload);
122		}
123		}
124	1	return null;
125		}
126
127	7	private function setWorkingOn(Job $job): void
128		{
129	7	$time = new \DateTime();
130	7	$time->setTimezone(new \DateTimeZone('UTC'));
131	7	$timeString = $time->format(\DateTime::ISO8601);
132	7	$workerPayload = $this->serializer->serialize([
133	7	'queue' => $job->getQueueName(),
134	7	'run_at' => $timeString,
135	7	'payload' => $job->getPayload(),
136		]);
137	7	$this->datastore->setWorkerPayload($this->id, $workerPayload);
138	7	}
139
140	7	private function performWithFork(Job $job): void
141		{
142	7	$this->childId = pcntl_fork();
143
144	7	switch ($this->childId) {
145
146	7	case self::FORK_FAILED:
147	1	$this->dispatcher->dispatch(ForkFailed::class, ['worker' => $this, 'job' => $job]);
148	1	$this->criticalWorkerShutdown($job);
149	1	break;
150
151	6	case self::FORK_CHILD:
152	3	$this->performJob($job);
153	3	$this->shouldShutdown = true;
154	3	$this->isChildThread = true;
155	3	break;
156
157		default: // parent case
158	3	$this->dispatcher->dispatch(ParentWaiting::class, ['worker' => $this]);
159	3	$this->waitForChild($job);
160		}
161
162	7	$this->childId = null;
163	7	$this->doneWorking();
164	7	}
165
166	7	private function doneWorking(): void
167		{
168	7	if (!$this->isChildThread) {
169	4	$this->dispatcher->dispatch(WorkerDoneWorking::class, ['worker' => $this]);
170		}
171	7	}
172
173	7	private function createJobFromPayload(string $queueName, string $serializedPayload): Job
174		{
175	7	$payload = $this->serializer->unserialize($serializedPayload);
176	7	$factory = $this->serviceLocator->get(Job::class);
177	7	return $factory($queueName, $payload, $this->serviceLocator);
178		}
179
180	1	public function criticalWorkerShutdown(Job $job): void
181		{
182	1	$this->requeueJob($job);
183	1	$this->shutdown();
184	1	}
185
186	1	private function requeueJob(Job $job): void
187		{
188	1	$payload = $this->createPayloadFromJob($job);
189	1	$this->datastore->pushToQueue($job->getQueueName(), $payload);
190	1	}
191
192	1	private function createPayloadFromJob($job): string
193		{
194	1	return $this->serializer->serialize($job->getPayload());
195		}
196
197	3	private function performJob(Job $job): void
198		{
199	3	$this->datastore->reconnect();
200	3	$job->perform();
201	3	}
202
203	3	private function waitForChild(Job $job): void
204		{
205	3	$status = null;
206	3	$exitCode = null;
207	3	pcntl_wait($status);
208	3	if (!pcntl_wifexited($status) \|\| 0 !== ($exitCode = pcntl_wexitstatus($status))) {
209	2	if ($job->hasFailed()) {
210	1	$this->dispatcher->dispatch(JobFailed::class, ['worker' => $this, 'job' => $job, 'status' => $status, 'exit_code' => $exitCode]);
211		} else {
212	1	$this->dispatcher->dispatch(UnknownChildFailure::class, ['worker' => $this, 'job' => $job, 'status' => $status, 'exit_code' => $exitCode]);
213	1	$this->shutdown();
214		}
215		}
216	3	}
217
218	2	public function shutdown(): void
219		{
220	2	$this->shouldShutdown = true;
221	2	}
222
223	3	public function forceShutdown(): void
224		{
225	3	$this->shouldShutdown = true;
226	3	if (!empty($this->childId)) {
227	2	posix_kill($this->childId, SIGTERM) \|\| posix_kill($this->childId, SIGKILL);
228		}
229	3	}
230
231	2	public function pause(): void
232		{
233	2	$this->isPaused = true;
234	2	}
235
236	1	public function continue()
237		{
238	1	$this->isPaused = false;
239	1	}
240		}
241

scones / resque

Worker::pause() A last analyzed 2019-05-28 12:05 UTC

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Worker::pause() A
last analyzed 2019-05-28 12:05 UTC