AzureBlobStorage - Code Metrics - Inspection of "WIP: Add support for Azure multicontainer" - KnpLabs/Gaufrette - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#486)

by Dalibor

created 2017-05-14 08:01 UTC

AzureBlobStorage B

↳ Parent: Project

Complexity

Total Complexity

Size/Duplication

Total Lines	504
Duplicated Lines	27.18 %

Coupling/Cohesion

Components	1
Dependencies	2

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
wmc	52
c	1
b	0
f	0
lcom	1
cbo	2
dl	137
loc	504
rs	7.9487

21 Methods

Rating	Name	Duplication	Size	Complexity
A	__construct()	0	11	3
A	getCreateContainerOptions()	0	4	1
A	setCreateContainerOptions()	0	4	1
B	createContainer()	23	23	4
A	deleteContainer()	19	19	3
A	read()	15	15	2
B	write()	0	28	4
B	exists()	0	34	6
B	keys()	0	29	3
A	mtime()	15	15	2
A	delete()	15	15	2
A	rename()	0	19	2
A	isDirectory()	0	5	1
A	setMetadata()	19	19	2
A	getMetadata()	21	21	2
A	init()	0	6	2
A	failIfContainerNotFound()	0	12	2
A	getErrorCodeFromServiceException()	0	10	3
A	guessContentType()	10	10	2
A	tokenizeKey()	0	18	3
A	fetchBlobs()	0	14	2

How to fix Duplicated Code Complexity

Duplicated Code

Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.

Common duplication problems, and corresponding solutions are:

If you have the same expression in different places: Extract expression to a method
If you have the same method in different sub-classes: Extract method, and pull up field to the parent class
If you have the same code in unrelated classes: Consider extracting the code to a new class, and injecting that class

Complex Class

Tip: Before tackling complexity, make sure that you eliminate any duplication first. This often can reduce the size of classes significantly.

Complex classes like AzureBlobStorage often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.

Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.

While breaking up the class, it is a good idea to analyze how other classes use AzureBlobStorage, and based on these observations, apply Extract Interface, too.

<?php

namespace Gaufrette\Adapter;

use Gaufrette\Adapter;
use Gaufrette\Util;
use Gaufrette\Adapter\AzureBlobStorage\BlobProxyFactoryInterface;
use MicrosoftAzure\Storage\Blob\Models\Blob;
use MicrosoftAzure\Storage\Blob\Models\Container;
use MicrosoftAzure\Storage\Blob\Models\CreateBlobOptions;
use MicrosoftAzure\Storage\Blob\Models\CreateContainerOptions;
use MicrosoftAzure\Storage\Blob\Models\DeleteContainerOptions;
use MicrosoftAzure\Storage\Blob\Models\ListBlobsOptions;
use MicrosoftAzure\Storage\Common\Exceptions\ServiceException;

/**
 * Microsoft Azure Blob Storage adapter.
 *
 * @author Luciano Mammino <[email protected]>
 * @author Paweł Czyżewski <[email protected]>
 */
class AzureBlobStorage implements Adapter,

                                  MetadataSupporter

{
    /**
     * Error constants.
     */
    const ERROR_CONTAINER_ALREADY_EXISTS = 'ContainerAlreadyExists';
    const ERROR_CONTAINER_NOT_FOUND = 'ContainerNotFound';

    /**
     * @var AzureBlobStorage\BlobProxyFactoryInterface
     */
    protected $blobProxyFactory;

    /**
     * @var string
     */
    protected $containerName;

    /**
     * @var bool
     */
    protected $detectContentType;

    /**
     * @var \MicrosoftAzure\Storage\Blob\Internal\IBlob
     */
    protected $blobProxy;

    /**
     * @var bool
     */
    protected $multiContainerMode = false;

    /**
     * @var CreateContainerOptions
     */
    protected $createContainerOptions;

    /**
     * @param AzureBlobStorage\BlobProxyFactoryInterface $blobProxyFactory
     * @param string|null                                $containerName
     * @param bool                                       $create
     * @param bool                                       $detectContentType
     *
     * @throws \RuntimeException
     */
    public function __construct(BlobProxyFactoryInterface $blobProxyFactory, $containerName = null, $create = false, $detectContentType = true)
    {
        $this->blobProxyFactory = $blobProxyFactory;
        $this->containerName = $containerName;
        $this->detectContentType = $detectContentType;
        if (null === $containerName) {
            $this->multiContainerMode = true;
        } elseif ($create) {
            $this->createContainer($containerName);
        }
    }

    /**
     * @return CreateContainerOptions
     */
    public function getCreateContainerOptions()
    {
        return $this->createContainerOptions;
    }

    /**
     * @param CreateContainerOptions $options
     */
    public function setCreateContainerOptions(CreateContainerOptions $options)
    {
        $this->createContainerOptions = $options;
    }

    /**
     * Creates a new container.
     *
     * @param string                                                     $containerName
     * @param \MicrosoftAzure\Storage\Blob\Models\CreateContainerOptions $options
     *
     * @throws \RuntimeException if cannot create the container
     */
    public function createContainer($containerName, CreateContainerOptions $options = null)

    {
        $this->init();

        if (null === $options) {
            $options = $this->getCreateContainerOptions();
        }

        try {
            $this->blobProxy->createContainer($containerName, $options);
        } catch (ServiceException $e) {

            $errorCode = $this->getErrorCodeFromServiceException($e);

            if ($errorCode !== self::ERROR_CONTAINER_ALREADY_EXISTS) {
                throw new \RuntimeException(sprintf(
                    'Failed to create the configured container "%s": %s (%s).',
                    $containerName,
                    $e->getErrorText(),
                    $errorCode
                ));
            }
        }
    }

    /**
     * Deletes a container.
     *
     * @param string                 $containerName
     * @param DeleteContainerOptions $options
     *
     * @throws \RuntimeException if cannot delete the container
     */
    public function deleteContainer($containerName, DeleteContainerOptions $options = null)

    {
        $this->init();

        try {
            $this->blobProxy->deleteContainer($containerName, $options);
        } catch (ServiceException $e) {

            $errorCode = $this->getErrorCodeFromServiceException($e);

            if ($errorCode !== self::ERROR_CONTAINER_NOT_FOUND) {
                throw new \RuntimeException(sprintf(
                    'Failed to delete the configured container "%s": %s (%s).',
                    $containerName,
                    $e->getErrorText(),
                    $errorCode
                ), $e->getCode());
            }
        }
    }

    /**
     * {@inheritdoc}
     * @throws \RuntimeException
     * @throws \InvalidArgumentException
     */
    public function read($key)

    {
        $this->init();
        list($containerName, $key) = $this->tokenizeKey($key);

        try {
            $blob = $this->blobProxy->getBlob($containerName, $key);

            return stream_get_contents($blob->getContentStream());
        } catch (ServiceException $e) {

            $this->failIfContainerNotFound($e, sprintf('read key "%s"', $key), $containerName);

            return false;
        }
    }

    /**
     * {@inheritdoc}
     * @throws \RuntimeException
     * @throws \InvalidArgumentException
     */
    public function write($key, $content)
    {
        $this->init();
        list($containerName, $key) = $this->tokenizeKey($key);

        $options = new CreateBlobOptions();

        if ($this->detectContentType) {
            $contentType = $this->guessContentType($content);

            $options->setBlobContentType($contentType);
        }

        try {
            $this->createContainer($containerName);

            $this->blobProxy->createBlockBlob($containerName, $key, $content, $options);
        } catch (ServiceException $e) {

            $this->failIfContainerNotFound($e, sprintf('write content for key "%s"', $key), $containerName);

            return false;
        }
        if (is_resource($content)) {
            return Util\Size::fromResource($content);
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());
}
        }

        return Util\Size::fromContent($content);
    }

    /**
     * {@inheritdoc}
     * @throws \RuntimeException
     * @throws \InvalidArgumentException
     */
    public function exists($key)
    {
        $this->init();
        list($containerName, $key) = $this->tokenizeKey($key);

        $listBlobsOptions = new ListBlobsOptions();
        $listBlobsOptions->setPrefix($key);

        try {
            $blobsList = $this->blobProxy->listBlobs($containerName, $listBlobsOptions);

            foreach ($blobsList->getBlobs() as $blob) {
                if ($key === $blob->getName()) {
                    return true;
                }
            }
        } catch (ServiceException $e) {

            $errorCode = $this->getErrorCodeFromServiceException($e);
            if ($this->multiContainerMode && self::ERROR_CONTAINER_NOT_FOUND === $errorCode) {
                return false;
            }
            $this->failIfContainerNotFound($e, 'check if key exists', $containerName);

            throw new \RuntimeException(sprintf(
                'Failed to check if key "%s" exists in container "%s": %s (%s).',
                $key,
                $containerName,
                $e->getErrorText(),
                $errorCode
            ), $e->getCode());
        }

        return false;
    }

    /**
     * {@inheritdoc}
     * @throws \RuntimeException
     */
    public function keys()
    {
        $this->init();

        try {
            if ($this->multiContainerMode) {
                $containersList = $this->blobProxy->listContainers();
                return call_user_func_array('array_merge', array_map(
                    function(Container $container) {
                        $containerName = $container->getName();
                        return $this->fetchBlobs($containerName, $containerName);
                    },
                    $containersList->getContainers()
                ));
            }

            return $this->fetchBlobs($this->containerName);
        } catch (ServiceException $e) {

            $this->failIfContainerNotFound($e, 'retrieve keys', $this->containerName);
            $errorCode = $this->getErrorCodeFromServiceException($e);

            throw new \RuntimeException(sprintf(
                'Failed to list keys for the container "%s": %s (%s).',
                $this->containerName,
                $e->getErrorText(),
                $errorCode
            ), $e->getCode());
        }
    }

    /**
     * {@inheritdoc}
     * @throws \RuntimeException
     * @throws \InvalidArgumentException
     */
    public function mtime($key)

    {
        $this->init();
        list($containerName, $key) = $this->tokenizeKey($key);

        try {
            $properties = $this->blobProxy->getBlobProperties($containerName, $key);

            return $properties->getProperties()->getLastModified()->getTimestamp();
        } catch (ServiceException $e) {

            $this->failIfContainerNotFound($e, sprintf('read mtime for key "%s"', $key), $containerName);

            return false;
        }
    }

    /**
     * {@inheritdoc}
     * @throws \RuntimeException
     * @throws \InvalidArgumentException
     */
    public function delete($key)

    {
        $this->init();
        list($containerName, $key) = $this->tokenizeKey($key);

        try {
            $this->blobProxy->deleteBlob($containerName, $key);

            return true;
        } catch (ServiceException $e) {

            $this->failIfContainerNotFound($e, sprintf('delete key "%s"', $key), $containerName);

            return false;
        }
    }

    /**
     * {@inheritdoc}
     * @throws \RuntimeException
     * @throws \InvalidArgumentException
     */
    public function rename($sourceKey, $targetKey)
    {
        $this->init();

        list($sourceContainerName, $sourceKey) = $this->tokenizeKey($sourceKey);
        list($targetContainerName, $targetKey) = $this->tokenizeKey($targetKey);

        try {
            $this->createContainer($targetContainerName);
            $this->blobProxy->copyBlob($targetContainerName, $targetKey, $sourceContainerName, $sourceKey);
            $this->blobProxy->deleteBlob($sourceContainerName, $sourceKey);

            return true;
        } catch (ServiceException $e) {

            $this->failIfContainerNotFound($e, sprintf('rename key "%s"', $sourceKey), $sourceContainerName);

            return false;
        }
    }

    /**
     * {@inheritdoc}
     */
    public function isDirectory($key)
    {
        // Windows Azure Blob Storage does not support directories
        return false;
    }

    /**
     * {@inheritdoc}
     * @throws \RuntimeException
     * @throws \InvalidArgumentException
     */
    public function setMetadata($key, $content)

    {
        $this->init();
        list($containerName, $key) = $this->tokenizeKey($key);

        try {
            $this->blobProxy->setBlobMetadata($containerName, $key, $content);
        } catch (ServiceException $e) {

            $errorCode = $this->getErrorCodeFromServiceException($e);

            throw new \RuntimeException(sprintf(
                'Failed to set metadata for blob "%s" in container "%s": %s (%s).',
                $key,
                $containerName,
                $e->getErrorText(),
                $errorCode
            ), $e->getCode());
        }
    }

    /**
     * {@inheritdoc}
     * @throws \RuntimeException
     * @throws \InvalidArgumentException
     */
    public function getMetadata($key)

    {
        $this->init();
        list($containerName, $key) = $this->tokenizeKey($key);

        try {
            $properties = $this->blobProxy->getBlobProperties($containerName, $key);

            return $properties->getMetadata();
        } catch (ServiceException $e) {

            $errorCode = $this->getErrorCodeFromServiceException($e);

            throw new \RuntimeException(sprintf(
                'Failed to get metadata for blob "%s" in container "%s": %s (%s).',
                $key,
                $containerName,
                $e->getErrorText(),
                $errorCode
            ), $e->getCode());
        }
    }

    /**
     * Lazy initialization, automatically called when some method is called after construction.
     */
    protected function init()
    {
        if ($this->blobProxy === null) {
            $this->blobProxy = $this->blobProxyFactory->create();
        }
    }

    /**
     * Throws a runtime exception if a give ServiceException derived from a "container not found" error.
     *
     * @param ServiceException $exception
     * @param string           $action
     * @param string           $containerName
     *
     * @throws \RuntimeException
     */
    protected function failIfContainerNotFound(ServiceException $exception, $action, $containerName)
    {
        $errorCode = $this->getErrorCodeFromServiceException($exception);

        if ($errorCode === self::ERROR_CONTAINER_NOT_FOUND) {
            throw new \RuntimeException(sprintf(
                'Failed to %s: container "%s" not found.',
                $action,
                $containerName
            ), $exception->getCode());
        }
    }

    /**
     * Extracts the error code from a service exception.
     *
     * @param ServiceException $exception
     *
     * @return string
     */
    protected function getErrorCodeFromServiceException(ServiceException $exception)
    {
        $xml = @simplexml_load_string($exception->getResponse()->getBody());

        if ($xml && isset($xml->Code)) {
            return (string) $xml->Code;
        }

        return $exception->getErrorText();
    }

    /**
     * @param string|resource $content
     *
     * @return string
     */
    private function guessContentType($content)

    {
        $fileInfo = new \finfo(FILEINFO_MIME_TYPE);

        if (is_resource($content)) {
            return $fileInfo->file(stream_get_meta_data($content)['uri']);
        }

        return $fileInfo->buffer($content);
    }

    /**
     * @param string $key
     *
     * @return array
     * @throws \InvalidArgumentException
     */
    private function tokenizeKey($key)
    {
        $containerName = $this->containerName;
        if (false === $this->multiContainerMode) {
            return [$containerName, $key];
        }

        if (false === ($index = strpos($key, '/'))) {
            throw new \InvalidArgumentException(sprintf(
                'Failed to establish container name from key "%s", container name is required in multi-container mode',
                $key
            ));
        }
        $containerName = substr($key, 0, $index);
        $key = substr($key, $index + 1);

        return [$containerName, $key];
    }

    /**
     * @param string $containerName
     * @param null   $prefix
     *
     * @return array
     */
    private function fetchBlobs($containerName, $prefix = null)
    {
        $blobList = $this->blobProxy->listBlobs($containerName);
        return array_map(
            function (Blob $blob) use ($prefix) {
                $name = $blob->getName();
                if (null !== $prefix) {
                    $name = $prefix .'/'. $name;
                }
                return $name;
            },
            $blobList->getBlobs()
        );
    }
}


1			<?php
2
3			namespace Gaufrette\Adapter;
4
5			use Gaufrette\Adapter;
6			use Gaufrette\Util;
7			use Gaufrette\Adapter\AzureBlobStorage\BlobProxyFactoryInterface;
8			use MicrosoftAzure\Storage\Blob\Models\Blob;
9			use MicrosoftAzure\Storage\Blob\Models\Container;
10			use MicrosoftAzure\Storage\Blob\Models\CreateBlobOptions;
11			use MicrosoftAzure\Storage\Blob\Models\CreateContainerOptions;
12			use MicrosoftAzure\Storage\Blob\Models\DeleteContainerOptions;
13			use MicrosoftAzure\Storage\Blob\Models\ListBlobsOptions;
14			use MicrosoftAzure\Storage\Common\Exceptions\ServiceException;
15
16			/**
17			* Microsoft Azure Blob Storage adapter.
18			*
19			* @author Luciano Mammino <[email protected]>
20			* @author Paweł Czyżewski <[email protected]>
21			*/
22			class AzureBlobStorage implements Adapter,
			0 ignored issues – show Coding Style introduced 2016-03-05 14:38 UTC by Report Bug Copy Issue Report The first item in a multi-line implements list must be on the line following the implements keyword Loading history...
23			MetadataSupporter
			0 ignored issues – show Coding Style introduced 2016-03-05 14:38 UTC by Report Bug Copy Issue Report Expected 4 spaces before interface name; 34 found Loading history...
24			{
25			/**
26			* Error constants.
27			*/
28			const ERROR_CONTAINER_ALREADY_EXISTS = 'ContainerAlreadyExists';
29			const ERROR_CONTAINER_NOT_FOUND = 'ContainerNotFound';
30
31			/**
32			* @var AzureBlobStorage\BlobProxyFactoryInterface
33			*/
34			protected $blobProxyFactory;
35
36			/**
37			* @var string
38			*/

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