RabbitMqWorker::getRetryCount() - Code Metrics - Inspection of "Added Isobar logo." - Gendoria/command-queue-rabbitmq-bundle - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( 59049f...fab486 )

by Tomasz

created 2016-10-04 12:14 UTC

RabbitMqWorker::getRetryCount() A

↳ Parent: RabbitMqWorker

Complexity

Conditions	3
Paths	3

Size

Total Lines	13
Code Lines	9

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
dl	0
loc	13
rs	9.4285
c	0
b	0
f	0
cc	3
eloc	9
nc	3
nop	1

<?php

namespace Gendoria\CommandQueueRabbitMqDriverBundle\Worker;

use Exception;
use Gendoria\CommandQueue\CommandProcessor\CommandProcessorInterface;
use Gendoria\CommandQueue\ProcessorFactoryInterface;
use Gendoria\CommandQueue\ProcessorNotFoundException;
use Gendoria\CommandQueue\Worker\Exception\ProcessorErrorException;
use Gendoria\CommandQueue\Worker\Exception\TranslateErrorException;
use Gendoria\CommandQueueBundle\Worker\BaseSymfonyWorker;
use InvalidArgumentException;
use JMS\Serializer\Serializer;
use OldSound\RabbitMqBundle\RabbitMq\ConsumerInterface;
use OldSound\RabbitMqBundle\RabbitMq\ProducerInterface;
use PhpAmqpLib\Message\AMQPMessage;
use Psr\Log\LoggerInterface;
use Symfony\Component\EventDispatcher\EventDispatcherInterface;

/**
 * Command queue worker listening on commands form RabbitMQ channel.
 *
 * @author Tomasz Struczyński <[email protected]>
 */
class RabbitMqWorker extends BaseSymfonyWorker implements ConsumerInterface
{

    /**
     * Rabbit MQ worker subsystem name.
     * 
     * @var string
     */
    const SUBSYSTEM_NAME = "RabbitMqworker";

    /**
     * Serializer instance.
     *
     * @var Serializer
     */
    private $serializer;

    /**
     * Reschedule producer instance.
     *
     * @var ProducerInterface
     */
    private $rescheduleProducer;

    /**
     * Class constructor.
     *
     * @param EventDispatcherInterface $eventDispatcher    Symfony event dispatcher.
     * @param ProcessorFactoryInterface         $processorFactory
     * @param Serializer               $serializer
     * @param ProducerInterface                 $rescheduleProducer
     * @param LoggerInterface          $logger             Logger instance.
     */
    public function __construct(EventDispatcherInterface $eventDispatcher, ProcessorFactoryInterface $processorFactory, Serializer $serializer, ProducerInterface $rescheduleProducer, LoggerInterface $logger = null)
    {
        parent::__construct($processorFactory, $eventDispatcher, $logger);

        $this->serializer = $serializer;
        $this->rescheduleProducer = $rescheduleProducer;
    }

    /**
     * Process single message received from RabbitMq server.
     *
     * @param AMQPMessage $msg
     *
     * @return null|integer Return code, dictating further message status.
     */
    public function execute(AMQPMessage $msg)
    {
        //We try to process message. On known errors we try to reschedule. On unknown - we simply reject.
        try {
            $this->process($msg);
        } catch (ProcessorErrorException $e) {
            $this->maybeReschedule($msg, $e, $e->getProcessor());
            return self::MSG_REJECT;
        } catch (ProcessorNotFoundException $e) {
            $this->maybeReschedule($msg, $e);
            return self::MSG_REJECT;
        } catch (TranslateErrorException $e) {
            $this->maybeReschedule($msg, $e);
            return self::MSG_REJECT;
        } catch (Exception $e) {
            return self::MSG_REJECT;
        }
    }

    protected function translateCommand($commandData)
    {
        /* @var $commandData AMQPMessage */
        $headers = $commandData->get('application_headers')->getNativeData();
        if (empty($headers['x-class-name'])) {
            throw new InvalidArgumentException("Class name header 'x-class-name' not found");
        }
        return $this->serializer->deserialize(
class Author {
    private $name;

    public function __construct($name) {
        $this->name = $name;
    }

    public function getName() {
        return $this->name;
    }
}

abstract class Post {
    public function getAuthor() {
        return 'Johannes';
    }
}

class BlogPost extends Post {
    public function getAuthor() {
        return new Author('Johannes');
    }
}

class ForumPost extends Post { /* ... */ }

function my_function(Post $post) {
    echo strtoupper($post->getAuthor());
}
                $commandData->body, $headers['x-class-name'], 'json'
        );
    }

    public function getSubsystemName()
    {
        return self::SUBSYSTEM_NAME;
    }

    /**
     * Send message for rescheduler, if maximum number of tries has not been exceeded.
     *
     * @param AMQPMessage               $msg
     * @param Exception                 $e
     * @param CommandProcessorInterface $processor
     */
    private function maybeReschedule(AMQPMessage $msg, Exception $e, CommandProcessorInterface $processor = null)
    {
        $triesNum = 10;
        $headers = $msg->get('application_headers')->getNativeData();
        $retryCount = $this->getRetryCount($headers);
        $retry = ($retryCount < $triesNum - 1);
        $resheduleInS = (5 * $retryCount + 10);

        $this->logger->error(
            sprintf(
                'Error while executing processor (retry count: %d - %s): %s', $retryCount + 1, $retry ? 'retry in ' . $resheduleInS . 's' : 'reject', $e->getMessage()
            ), array($e->getTraceAsString(), $this, $processor)
        );

        if ($retry) {
            $this->rescheduleProducer->publish(
                $msg->body, $msg->delivery_info['routing_key'], array_merge(
function acceptsInteger($int) { }

$x = '123'; // string "123"

// Instead of
acceptsInteger($x);

// we recommend to use
acceptsInteger((integer) $x);
                    $msg->get_properties(), array('expiration' => $resheduleInS * 1000)
                )
            );
        }
    }

    /**
     * Get retry count.
     * 
     * @param array $headers
     * @return integer
     */
    private function getRetryCount($headers)
    {
        if (!empty($headers['x-death'])) {
            if (!empty($headers['x-death'][0]['count'])) {
                $retryCount = $headers['x-death'][0]['count'];
            } else {
                $retryCount = count($headers['x-death']);
            }
        } else {
            $retryCount = 0;
        }
        return $retryCount;
    }

}


1			<?php
2
3			namespace Gendoria\CommandQueueRabbitMqDriverBundle\Worker;
4
5			use Exception;
6			use Gendoria\CommandQueue\CommandProcessor\CommandProcessorInterface;
7			use Gendoria\CommandQueue\ProcessorFactoryInterface;
8			use Gendoria\CommandQueue\ProcessorNotFoundException;
9			use Gendoria\CommandQueue\Worker\Exception\ProcessorErrorException;
10			use Gendoria\CommandQueue\Worker\Exception\TranslateErrorException;
11			use Gendoria\CommandQueueBundle\Worker\BaseSymfonyWorker;
12			use InvalidArgumentException;
13			use JMS\Serializer\Serializer;
14			use OldSound\RabbitMqBundle\RabbitMq\ConsumerInterface;
15			use OldSound\RabbitMqBundle\RabbitMq\ProducerInterface;
16			use PhpAmqpLib\Message\AMQPMessage;
17			use Psr\Log\LoggerInterface;
18			use Symfony\Component\EventDispatcher\EventDispatcherInterface;
19
20			/**
21			* Command queue worker listening on commands form RabbitMQ channel.
22			*
23			* @author Tomasz Struczyński <[email protected]>
24			*/
25			class RabbitMqWorker extends BaseSymfonyWorker implements ConsumerInterface
26			{
27
28			/**
29			* Rabbit MQ worker subsystem name.
30			*
31			* @var string
32			*/
33			const SUBSYSTEM_NAME = "RabbitMqworker";
34
35			/**
36			* Serializer instance.
37			*
38			* @var Serializer
39			*/
40			private $serializer;
41
42			/**
43			* Reschedule producer instance.
44			*
45			* @var ProducerInterface
46			*/
47			private $rescheduleProducer;
48
49			/**
50			* Class constructor.
51			*
52			* @param EventDispatcherInterface $eventDispatcher Symfony event dispatcher.
53			* @param ProcessorFactoryInterface $processorFactory
54			* @param Serializer $serializer
55			* @param ProducerInterface $rescheduleProducer
56			* @param LoggerInterface $logger Logger instance.
57			*/
58			public function __construct(EventDispatcherInterface $eventDispatcher, ProcessorFactoryInterface $processorFactory, Serializer $serializer, ProducerInterface $rescheduleProducer, LoggerInterface $logger = null)
59			{
60			parent::__construct($processorFactory, $eventDispatcher, $logger);
61
62			$this->serializer = $serializer;
63			$this->rescheduleProducer = $rescheduleProducer;
64			}
65
66			/**
67			* Process single message received from RabbitMq server.
68			*
69			* @param AMQPMessage $msg
70			*
71			* @return null\|integer Return code, dictating further message status.
72			*/
73			public function execute(AMQPMessage $msg)
74			{
75			//We try to process message. On known errors we try to reschedule. On unknown - we simply reject.
76			try {
77			$this->process($msg);
78			} catch (ProcessorErrorException $e) {
79			$this->maybeReschedule($msg, $e, $e->getProcessor());
80			return self::MSG_REJECT;
81			} catch (ProcessorNotFoundException $e) {
82			$this->maybeReschedule($msg, $e);
83			return self::MSG_REJECT;
84			} catch (TranslateErrorException $e) {
85			$this->maybeReschedule($msg, $e);
86			return self::MSG_REJECT;
87			} catch (Exception $e) {
88			return self::MSG_REJECT;
89			}
90			}
91
92			protected function translateCommand($commandData)
93			{
94			/* @var $commandData AMQPMessage */
95			$headers = $commandData->get('application_headers')->getNativeData();
96			if (empty($headers['x-class-name'])) {
97			throw new InvalidArgumentException("Class name header 'x-class-name' not found");
98			}
99			return $this->serializer->deserialize(
			0 ignored issues – show Bug Best Practice introduced 2016-10-04 12:26 UTC by Report Bug Copy Issue Report The return type of `return $this->serializer...-class-name'], 'json');` (`object\|array\|integer\|double\|string\|boolean`) is incompatible with the return type declared by the abstract method `Gendoria\CommandQueue\Wo...orker::translateCommand` of type `Gendoria\CommandQueue\Command\CommandInterface`. If you return a value from a function or method, it should be a sub-type of the type that is given by the parent type f.e. an interface, or abstract method. This is more formally defined by the Lizkov substitution principle, and guarantees that classes that depend on the parent type can use any instance of a child type interchangably. This principle also belongs to the SOLID principles for object oriented design. Let’s take a look at an example: class Author { private $name; public function __construct($name) { $this->name = $name; } public function getName() { return $this->name; } } abstract class Post { public function getAuthor() { return 'Johannes'; } } class BlogPost extends Post { public function getAuthor() { return new Author('Johannes'); } } class ForumPost extends Post { /* ... */ } function my_function(Post $post) { echo strtoupper($post->getAuthor()); } Our function `my_function` expects a `Post` object, and outputs the author of the post. The base class `Post` returns a simple string and outputting a simple string will work just fine. However, the child class `BlogPost` which is a sub-type of `Post` instead decided to return an `object`, and is therefore violating the SOLID principles. If a `BlogPost` were passed to `my_function`, PHP would not complain, but ultimately fail when executing the `strtoupper` call in its body. Loading history...
100			$commandData->body, $headers['x-class-name'], 'json'
101			);
102			}
103
104			public function getSubsystemName()
105			{
106			return self::SUBSYSTEM_NAME;
107			}
108
109			/**
110			* Send message for rescheduler, if maximum number of tries has not been exceeded.
111			*
112			* @param AMQPMessage $msg
113			* @param Exception $e
114			* @param CommandProcessorInterface $processor
115			*/
116			private function maybeReschedule(AMQPMessage $msg, Exception $e, CommandProcessorInterface $processor = null)
117			{
118			$triesNum = 10;
119			$headers = $msg->get('application_headers')->getNativeData();
120			$retryCount = $this->getRetryCount($headers);
121			$retry = ($retryCount < $triesNum - 1);
122			$resheduleInS = (5 * $retryCount + 10);
123
124			$this->logger->error(
125			sprintf(
126			'Error while executing processor (retry count: %d - %s): %s', $retryCount + 1, $retry ? 'retry in ' . $resheduleInS . 's' : 'reject', $e->getMessage()
127			), array($e->getTraceAsString(), $this, $processor)
128			);
129
130			if ($retry) {
131			$this->rescheduleProducer->publish(
132			$msg->body, $msg->delivery_info['routing_key'], array_merge(
			0 ignored issues – show Documentation introduced 2016-10-04 12:26 UTC by Report Bug Copy Issue Report `$msg->delivery_info['routing_key']` is of type `object<PhpAmqpLib\Channel\AMQPChannel>`, but the function expects a `string`. It seems like the type of the argument is not accepted by the function/method which you are calling. In some cases, in particular if PHP’s automatic type-juggling kicks in this might be fine. In other cases, however this might be a bug. We suggest to add an explicit type cast like in the following example: function acceptsInteger($int) { } $x = '123'; // string "123" // Instead of acceptsInteger($x); // we recommend to use acceptsInteger((integer) $x); Loading history...
133			$msg->get_properties(), array('expiration' => $resheduleInS * 1000)
134			)
135			);
136			}
137			}
138
139			/**
140			* Get retry count.
141			*
142			* @param array $headers
143			* @return integer
144			*/
145			private function getRetryCount($headers)
146			{
147			if (!empty($headers['x-death'])) {
148			if (!empty($headers['x-death'][0]['count'])) {
149			$retryCount = $headers['x-death'][0]['count'];
150			} else {
151			$retryCount = count($headers['x-death']);
152			}
153			} else {
154			$retryCount = 0;
155			}
156			return $retryCount;
157			}
158
159			}
160

Gendoria / command-queue-rabbitmq-bundle

Push — master ( 59049f...fab486 )

RabbitMqWorker::getRetryCount() A

Complexity

Size

Duplication

Importance

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