TempFileCache::__construct() - Code Metrics - Inspection of "Rollup of several minor re-factors to clean up sta..." - Vectorface/cache - Measure and Improve Code Quality continuously with Scrutinizer

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by Jonathan

created 2020-03-18 02:34 UTC

TempFileCache::__construct() A

↳ Parent: TempFileCache

Complexity

Conditions	3
Paths	3

Size

Total Lines	12
Code Lines	7

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	8
CRAP Score	3

Importance

Changes	3
Bugs	0	Features	0

Metric	Value
eloc	7
c	3
b	0
f	0
dl	0
loc	12
ccs	8
cts	8
cp	1
rs	10
cc	3
nc	3
nop	2
crap	3

<?php

namespace Vectorface\Cache;

use Vectorface\Cache\Common\MultipleTrait;
use Vectorface\Cache\Common\PSR16Util;

/**
 * Represents a cache whose entries are stored in temporary files.
 */
class TempFileCache implements Cache
{
    use MultipleTrait, PSR16Util;

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

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

    /**
     * Create a temporary file cache.
     *
     * @param string $directory The directory in which cache files should be stored.
     * @param string $extension The extension to be used after the filename to uniquely identify cache files.
     *
     * Note:
     *  - Without a directory argument, the system tempdir will be used (e.g. /tmp/TempFileCache/)
     *  - If given a relative path, it will create that directory within the system tempdir.
     *  - If given an absolute path, it will attempt to use that path as-is. Not recommended.
     * @throws \Exception
     */
    public function __construct($directory = null, $extension = '.tempcache')
    {
        $this->directory = $this->getTempDir($directory);
        $this->checkAndCreateDir($this->directory);

        $realpath = realpath($this->directory); /* Get rid of extraneous symlinks, ..'s, etc. */
        if (!$realpath) {
            throw new \Exception("Could not get directory realpath");
        }
        $this->directory = $realpath;

        $this->extension = empty($extension) ? "" : (string)$extension;
    }

    /**
     * Check for a directory's existence and writability, and create otherwise
     *
     * @param string $directory
     * @throws \Exception
     */
    private function checkAndCreateDir($directory)
    {
        if (!file_exists($directory)) {
            if (!@mkdir($directory, 0700, true)) {
                throw new \Exception("Directory does not exist, and could not be created: {$directory}");
            }
        } elseif (is_dir($directory)) {
            if (!is_writable($directory)) {
                throw new \Exception("Directory is not writable: {$directory}");
            }
        } else {
            throw new \Exception("Not a directory: {$directory}");
        }
    }

    /**
     * Generate a consistent temporary directory based on a requested directory name.
     *
     * @param string $directory The name or path of a temporary directory.
     * @return string The directory name, resolved to a full path.
     */
    private function getTempDir($directory)
    {
        if (empty($directory) || !is_string($directory)) {
            $classParts = explode("\\", static::class);
            return sys_get_temp_dir()  . '/' . end($classParts);
        } elseif (strpos($directory, '/') !== 0) {
            return sys_get_temp_dir() . '/' . $directory;
        } else {
            return $directory;
        }
    }

    /**
     * @inheritDoc Vectorface\Cache\Cache
     */
    public function get($key, $default = null)
    {
        $file = $this->makePath($this->key($key));
        $data = @file_get_contents($file);
        if (!$data) {
            return $default;
        }

        $data = @unserialize($data);
        if (!$data) {
            $this->delete($key); /* Delete corrupted. */
            return $default;
        }

        list($expiry, $value) = $data;
        if ($expiry !== false && ($expiry < microtime(true))) {
            $this->delete($key);
            return $default;
        }

        return $value;
    }

    /**
     * @inheritDoc Vectorface\Cache\Cache
     */
    public function set($key, $value, $ttl = null)
    {
        $ttl = $this->ttl($ttl);
        $data = [$ttl ? microtime(true) + $ttl : false, $value];
        return @file_put_contents($this->makePath($this->key($key)), serialize($data)) !== false;
    }

    /**
     * Delete an entry in the cache by key regardless of TTL
     *
     * @param string $key A key to delete from the cache.
     * @return bool True if the cache entry was successfully deleted, false otherwise.
     */
    public function delete($key)
    {
        return @unlink($this->makePath($this->key($key)));
    }

    /**
     * Manually clean out entries older than their TTL
     *
     * @return bool Returns true if the cache directory was cleaned.
     */
    public function clean()
    {
        if (!($files = $this->getCacheFiles())) {
            return false;
        }

        foreach ($files as $file) {
            $key = basename($file, $this->extension);
            $this->get($key); // Automatically deletes if expired
        }
        return true;
    }

    /**
     * Clear the cache
     *
     * @return bool Returns true if all files were flushed.
     */
    public function flush()
    {
        if (($files = $this->getCacheFiles()) === false) {
            return false;
        }

        $result = true;
        foreach ($files as $file) {
            $result = $result && @unlink($file);
        }
        return $result;
    }

    /**
     * @inheritDoc \Psr\SimpleCache\CacheInterface
     */
    public function clear()
    {
        return $this->flush();
    }

    /**
     * @inheritDoc \Psr\SimpleCache\CacheInterface
     */
    public function has($key)
    {
        return $this->get($key, null) !== null;
    }

    /**
     * Creates a file path in the form directory/key.extension
     *
     * @param  String $key the key of the cached element
     * @return String The file path to the cached element's enclosing file.
     */
    private function makePath($key)
    {
        return $this->directory . "/" . hash("sha224", $key) . $this->extension;
    }

    /**
     * Finds all files with the cache extension in the cache directory
     *
     * @return array|false Returns an array of filenames that represent cached entries.
     */
    private function getCacheFiles()
    {
        if (!($files = @scandir($this->directory, 1))) {
            return false;
        }

        $negExtLen = -1 * strlen($this->extension);
        $return = [];
        foreach ($files as $file) {
            if (substr($file, $negExtLen) === $this->extension) {
                $return[] = $this->directory . '/' . $file;
            }
        }
        return $return;
    }

    /**
     * Destroy this cache; Clear everything.
     *
     * Any operations on the cache after this operation are invalid, and their behavior will be undefined.
     *
     * @return bool True if the cache was flushed and the directory deleted.
     */
    public function destroy()
    {
        return $this->flush() && @rmdir($this->directory);
    }
}


1		<?php
2
3		namespace Vectorface\Cache;
4
5		use Vectorface\Cache\Common\MultipleTrait;
6		use Vectorface\Cache\Common\PSR16Util;
7
8		/**
9		* Represents a cache whose entries are stored in temporary files.
10		*/
11		class TempFileCache implements Cache
12		{
13		use MultipleTrait, PSR16Util;
14
15		/**
16		* @var string
17		*/
18		private $directory;
19
20		/**
21		* @var string
22		*/
23		private $extension;
24
25		/**
26		* Create a temporary file cache.
27		*
28		* @param string $directory The directory in which cache files should be stored.
29		* @param string $extension The extension to be used after the filename to uniquely identify cache files.
30		*
31		* Note:
32		* - Without a directory argument, the system tempdir will be used (e.g. /tmp/TempFileCache/)
33		* - If given a relative path, it will create that directory within the system tempdir.
34		* - If given an absolute path, it will attempt to use that path as-is. Not recommended.
35		* @throws \Exception
36		*/
37	22	public function __construct($directory = null, $extension = '.tempcache')
38		{
39	22	$this->directory = $this->getTempDir($directory);
40	22	$this->checkAndCreateDir($this->directory);
41
42	22	$realpath = realpath($this->directory); /* Get rid of extraneous symlinks, ..'s, etc. */
43	22	if (!$realpath) {
44	1	throw new \Exception("Could not get directory realpath");
45		}
46	22	$this->directory = $realpath;
47
48	22	$this->extension = empty($extension) ? "" : (string)$extension;
49	22	}
50
51		/**
52		* Check for a directory's existence and writability, and create otherwise
53		*
54		* @param string $directory
55		* @throws \Exception
56		*/
57	22	private function checkAndCreateDir($directory)
58		{
59	22	if (!file_exists($directory)) {
60	22	if (!@mkdir($directory, 0700, true)) {
61	22	throw new \Exception("Directory does not exist, and could not be created: {$directory}");
62		}
63	3	} elseif (is_dir($directory)) {
64	3	if (!is_writable($directory)) {
65	3	throw new \Exception("Directory is not writable: {$directory}");
66		}
67		} else {
68	1	throw new \Exception("Not a directory: {$directory}");
69		}
70	22	}
71
72		/**
73		* Generate a consistent temporary directory based on a requested directory name.
74		*
75		* @param string $directory The name or path of a temporary directory.
76		* @return string The directory name, resolved to a full path.
77		*/
78	22	private function getTempDir($directory)
79		{
80	22	if (empty($directory) \|\| !is_string($directory)) {
81	22	$classParts = explode("\\", static::class);
82	22	return sys_get_temp_dir() . '/' . end($classParts);
83	2	} elseif (strpos($directory, '/') !== 0) {
84	1	return sys_get_temp_dir() . '/' . $directory;
85		} else {
86	1	return $directory;
87		}
88		}
89
90		/**
91		* @inheritDoc Vectorface\Cache\Cache
92		*/
93	20	public function get($key, $default = null)
94		{
95	20	$file = $this->makePath($this->key($key));
96	19	$data = @file_get_contents($file);
97	19	if (!$data) {
98	16	return $default;
99		}
100
101	9	$data = @unserialize($data);
102	9	if (!$data) {
103	1	$this->delete($key); /* Delete corrupted. */
104	1	return $default;
105		}
106
107	8	list($expiry, $value) = $data;
108	8	if ($expiry !== false && ($expiry < microtime(true))) {
109	1	$this->delete($key);
110	1	return $default;
111		}
112
113	8	return $value;
114		}
115
116		/**
117		* @inheritDoc Vectorface\Cache\Cache
118		*/
119	20	public function set($key, $value, $ttl = null)
120		{
121	20	$ttl = $this->ttl($ttl);
122	20	$data = [$ttl ? microtime(true) + $ttl : false, $value];
123	20	return @file_put_contents($this->makePath($this->key($key)), serialize($data)) !== false;
124		}
125
126		/**
127		* Delete an entry in the cache by key regardless of TTL
128		*
129		* @param string $key A key to delete from the cache.
130		* @return bool True if the cache entry was successfully deleted, false otherwise.
131		*/
132	7	public function delete($key)
133		{
134	7	return @unlink($this->makePath($this->key($key)));
135		}
136
137		/**
138		* Manually clean out entries older than their TTL
139		*
140		* @return bool Returns true if the cache directory was cleaned.
141		*/
142	2	public function clean()
143		{
144	2	if (!($files = $this->getCacheFiles())) {
145	1	return false;
146		}
147
148	1	foreach ($files as $file) {
149	1	$key = basename($file, $this->extension);
150	1	$this->get($key); // Automatically deletes if expired
151		}
152	1	return true;
153		}
154
155		/**
156		* Clear the cache
157		*
158		* @return bool Returns true if all files were flushed.
159		*/
160	22	public function flush()
161		{
162	22	if (($files = $this->getCacheFiles()) === false) {
163	1	return false;
164		}
165
166	22	$result = true;
167	22	foreach ($files as $file) {
168	12	$result = $result && @unlink($file);
169		}
170	22	return $result;
171		}
172
173		/**
174		* @inheritDoc \Psr\SimpleCache\CacheInterface
175		*/
176	3	public function clear()
177		{
178	3	return $this->flush();
179		}
180
181		/**
182		* @inheritDoc \Psr\SimpleCache\CacheInterface
183		*/
184	1	public function has($key)
185		{
186	1	return $this->get($key, null) !== null;
187		}
188
189		/**
190		* Creates a file path in the form directory/key.extension
191		*
192		* @param String $key the key of the cached element
193		* @return String The file path to the cached element's enclosing file.
194		*/
195	19	private function makePath($key)
196		{
197	19	return $this->directory . "/" . hash("sha224", $key) . $this->extension;
198		}
199
200		/**
201		* Finds all files with the cache extension in the cache directory
202		*
203		* @return array\|false Returns an array of filenames that represent cached entries.
204		*/
205	22	private function getCacheFiles()
206		{
207	22	if (!($files = @scandir($this->directory, 1))) {
208	1	return false;
209		}
210
211	22	$negExtLen = -1 * strlen($this->extension);
212	22	$return = [];
213	22	foreach ($files as $file) {
214	22	if (substr($file, $negExtLen) === $this->extension) {
215	12	$return[] = $this->directory . '/' . $file;
216		}
217		}
218	22	return $return;
219		}
220
221		/**
222		* Destroy this cache; Clear everything.
223		*
224		* Any operations on the cache after this operation are invalid, and their behavior will be undefined.
225		*
226		* @return bool True if the cache was flushed and the directory deleted.
227		*/
228	22	public function destroy()
229		{
230	22	return $this->flush() && @rmdir($this->directory);
231		}
232		}
233

Vectorface / cache

Push — develop ( d108c3...2e70b5 )

TempFileCache::__construct() A

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