FileStorage::clear() - Code Metrics - Inspection of "Merge pull request #16 from djsmithme/psr" - djsmithme/Cache - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Branch — master (1afc22)

by Dan

created 2017-12-03 12:33 UTC

FileStorage::clear() A

↳ Parent: FileStorage

Complexity

Conditions	3
Paths	4

Size

Total Lines	13
Code Lines	7

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	6
CRAP Score	3.0261

Importance

Changes

Metric	Value
dl	0
loc	13
ccs	6
cts	7
cp	0.8571
rs	9.4285
c	0
b	0
f	0
cc	3
eloc	7
nc	4
nop	0
crap	3.0261

<?php
/**
 * Src/Cache/Storage/FileStorage.php
 *
 * @package     Ds\Cache\Storage
 * @subpackage  Cache
 * @author      Dan Smith <[email protected]>
 * @version     v.1 (20/03/2017)
 * @copyright   Copyright (c) 2017, Dan Smith
 */
namespace Ds\Cache\Storage;

use \DateInterval;
use Ds\Cache\CacheException;
use Ds\Cache\InvalidArgumentException;

/**
 * Class NullStorage
 *
 * @package Ds\Cache
 */
class FileStorage extends AbstractStorage
{
    /**
     * @var string
     */
    const EXTENSION = 'cache';

    /**
     * @var string
     */
    private $dir;

    /**
     * @var bool|array
     */
    private $previousRequest;

    /**
     * File Storage constructor.
     *
     * @param string $directory
     * @param DateInterval $ttl
     * @throws \Exception
     */
    public function __construct($directory, DateInterval $ttl)
    {
        if (!is_string($directory)){
            throw new InvalidArgumentException('Directory must be a valid string');
        }

        $this->dir = $directory;

        if(!@mkdir($this->dir, 0755) && !is_dir($this->dir)){
            throw new CacheException('unable to create directory');
        }

        parent::__construct($ttl);
    }

    /**
     * Persists data in the cache, uniquely referenced by a key with an optional expiration TTL time.
     *
     * @param \string   $key   The key of the item to store.
     * @param mixed    $value The value of the item to store, must be serializable.
     * @param null|\int $ttl   Optional. The TTL value of this item. If no value is sent and
     *                                     the driver supports TTL then the library may set a default value
     *                                     for it or let the driver take care of that.
     *
     * @return bool True on success and false on failure.
     * @throws InvalidArgumentException
     */
    public function set($key, $value, $ttl = null)
    {
        $ttl = time() + $this->getTtlTimestamp($ttl);
        $cacheItem = $this->_createCacheItem($key, $value, $ttl);

        if (null !== $value){
            \file_put_contents($cacheItem['file'],$cacheItem['data']);
            if (!file_exists($cacheItem['file'])){
                return false;
            }
        }

        return true;
    }


    /**
     * Determines whether an item is present in the cache.
     *
     * NOTE: It is recommended that has() is only to be used for cache warming type purposes
     * and not to be used within your live applications operations for get/set, as this method
     * is subject to a race condition where your has() will return true and immediately after,
     * another script can remove it making the state of your app out of date.
     *
     * @param string $key The cache item key.
     *
     * @return bool
     */
    public function has($key){
       if ($this->_fetchCacheFile($key)){
         return true;
       }
       return false;
    }

    /**
     * Fetches a value from the cache.
     *
     * @param string $key     The unique key of this item in the cache.
     *
     * @return mixed The value of the item from the cache, or $default in case of cache miss.
     *
     */
    public function get($key){
        if ($this->has($key)){
            return $this->previousRequest[1];
        }
        return null;
    }

    /**
     * Delete an item from the cache by its unique key.
     *
     * @param string $key The unique cache key of the item to delete.
     *
     * @return bool True if the item was successfully removed. False if there was an error.
     */
    public function delete($key)
    {
        return true;
    }

    /**
     * Wipes clean the entire cache's keys.
     *
     * @return bool True on success and false on failure.
     */
    public function clear(){
        if (is_dir( $this->dir )){
            array_map('unlink', glob("$this->dir/*.*"));
        }

        $data = glob("$this->dir/*.*");

        if (!empty($data)){
            return false;
        }

        return true;
    }

    /**
     * Cache is only called one for both has/get via this internal method.
     *
     * @param $key
     * @return bool|mixed
     * @internal
     */
    private function _fetchCacheFile($key){

        $cacheFile = implode('.',[$key, FileStorage::EXTENSION]);
        $cacheLocation = $this->dir . DIRECTORY_SEPARATOR . $cacheFile;
        $this->previousRequest = false;

        if (file_exists($cacheLocation)){

            $data = \file_get_contents($cacheLocation);
            $cacheData = json_decode($data, TRUE);
            $this->previousRequest = $cacheData;

            //cache has expired
            if ( $cacheData[0] < time() ){
                \unlink($cacheLocation);
                $this->previousRequest = false;
            }
        }
        return $this->previousRequest;
    }

    /**
     * Create cache item.
     *
     * @param string $key
     * @param $value
     * @param int $ttl
     * @return array
     * @throws InvalidArgumentException
     */
    private function _createCacheItem($key, $value, $ttl){

        if (preg_match('/[\\/\\*\\\\\?.]+/i', $key)){
            throw new InvalidArgumentException('$key must be a valid string');
        }

        $filename = implode('.',[(string)$key, FileStorage::EXTENSION]);

        return [
            'file' => $this->dir . DIRECTORY_SEPARATOR . $filename,
            'data' => json_encode([$ttl, $value])
        ];
    }
}


1		<?php
2		/**
3		* Src/Cache/Storage/FileStorage.php
4		*
5		* @package Ds\Cache\Storage
6		* @subpackage Cache
7		* @author Dan Smith <[email protected]>
8		* @version v.1 (20/03/2017)
9		* @copyright Copyright (c) 2017, Dan Smith
10		*/
11		namespace Ds\Cache\Storage;
12
13		use \DateInterval;
14		use Ds\Cache\CacheException;
15		use Ds\Cache\InvalidArgumentException;
16
17		/**
18		* Class NullStorage
19		*
20		* @package Ds\Cache
21		*/
22		class FileStorage extends AbstractStorage
23		{
24		/**
25		* @var string
26		*/
27		const EXTENSION = 'cache';
28
29		/**
30		* @var string
31		*/
32		private $dir;
33
34		/**
35		* @var bool\|array
36		*/
37		private $previousRequest;
38
39		/**
40		* File Storage constructor.
41		*
42		* @param string $directory
43		* @param DateInterval $ttl
44		* @throws \Exception
45		*/
46	14	public function __construct($directory, DateInterval $ttl)
47		{
48	14	if (!is_string($directory)){
49	1	throw new InvalidArgumentException('Directory must be a valid string');
50		}
51
52	14	$this->dir = $directory;
53
54	14	if(!@mkdir($this->dir, 0755) && !is_dir($this->dir)){
55	1	throw new CacheException('unable to create directory');
56		}
57
58	14	parent::__construct($ttl);
59	14	}
60
61		/**
62		* Persists data in the cache, uniquely referenced by a key with an optional expiration TTL time.
63		*
64		* @param \string $key The key of the item to store.
65		* @param mixed $value The value of the item to store, must be serializable.
66		* @param null\|\int $ttl Optional. The TTL value of this item. If no value is sent and
67		* the driver supports TTL then the library may set a default value
68		* for it or let the driver take care of that.
69		*
70		* @return bool True on success and false on failure.
71		* @throws InvalidArgumentException
72		*/
73	6	public function set($key, $value, $ttl = null)
74		{
75	6	$ttl = time() + $this->getTtlTimestamp($ttl);
76	6	$cacheItem = $this->_createCacheItem($key, $value, $ttl);
77
78	6	if (null !== $value){
79	6	\file_put_contents($cacheItem['file'],$cacheItem['data']);
80	6	if (!file_exists($cacheItem['file'])){
81		return false;
82		}
83		}
84
85	6	return true;
86		}
87
88
89		/**
90		* Determines whether an item is present in the cache.
91		*
92		* NOTE: It is recommended that has() is only to be used for cache warming type purposes
93		* and not to be used within your live applications operations for get/set, as this method
94		* is subject to a race condition where your has() will return true and immediately after,
95		* another script can remove it making the state of your app out of date.
96		*
97		* @param string $key The cache item key.
98		*
99		* @return bool
100		*/
101	5	public function has($key){
102	5	if ($this->_fetchCacheFile($key)){
103	2	return true;
104		}
105	3	return false;
106		}
107
108		/**
109		* Fetches a value from the cache.
110		*
111		* @param string $key The unique key of this item in the cache.
112		*
113		* @return mixed The value of the item from the cache, or $default in case of cache miss.
114		*
115		*/
116	1	public function get($key){
117	1	if ($this->has($key)){
118	1	return $this->previousRequest[1];
119		}
120		return null;
121		}
122
123		/**
124		* Delete an item from the cache by its unique key.
125		*
126		* @param string $key The unique cache key of the item to delete.
127		*
128		* @return bool True if the item was successfully removed. False if there was an error.
129		*/
130	1	public function delete($key)
131		{
132	1	return true;
133		}
134
135		/**
136		* Wipes clean the entire cache's keys.
137		*
138		* @return bool True on success and false on failure.
139		*/
140	1	public function clear(){
141	1	if (is_dir( $this->dir )){
142	1	array_map('unlink', glob("$this->dir/."));
143		}
144
145	1	$data = glob("$this->dir/.");
146
147	1	if (!empty($data)){
148		return false;
149		}
150
151	1	return true;
152		}
153
154		/**
155		* Cache is only called one for both has/get via this internal method.
156		*
157		* @param $key
158		* @return bool\|mixed
159		* @internal
160		*/
161	8	private function _fetchCacheFile($key){
162
163	8	$cacheFile = implode('.',[$key, FileStorage::EXTENSION]);
164	8	$cacheLocation = $this->dir . DIRECTORY_SEPARATOR . $cacheFile;
165	8	$this->previousRequest = false;
166
167	8	if (file_exists($cacheLocation)){
168
169	5	$data = \file_get_contents($cacheLocation);
170	5	$cacheData = json_decode($data, TRUE);
171	5	$this->previousRequest = $cacheData;
172
173		//cache has expired
174	5	if ( $cacheData[0] < time() ){
175	2	\unlink($cacheLocation);
176	2	$this->previousRequest = false;
177		}
178		}
179	8	return $this->previousRequest;
180		}
181
182		/**
183		* Create cache item.
184		*
185		* @param string $key
186		* @param $value
187		* @param int $ttl
188		* @return array
189		* @throws InvalidArgumentException
190		*/
191	8	private function _createCacheItem($key, $value, $ttl){
192
193	8	if (preg_match('/[\\/\\*\\\\\?.]+/i', $key)){
194	1	throw new InvalidArgumentException('$key must be a valid string');
195		}
196
197	7	$filename = implode('.',[(string)$key, FileStorage::EXTENSION]);
198
199		return [
200	7	'file' => $this->dir . DIRECTORY_SEPARATOR . $filename,
201	7	'data' => json_encode([$ttl, $value])
202		];
203		}
204		}
205

djsmithme / Cache

Branch — master (1afc22)

FileStorage::clear() A

Complexity

Size

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Importance

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