CachePlugin::configureOptions() - Code Metrics - Inspection of "Merge pull request #21 from Nyholm/patch-2" - php-http/plugins - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( 37fa4e...c6f75f )

by Joel

created 2015-12-25 11:56 UTC

CachePlugin::configureOptions() A

↳ Parent: CachePlugin

Complexity

Conditions	1
Paths	1

Size

Total Lines	10
Code Lines	6

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	8
CRAP Score	1

Importance

Changes	2
Bugs	0	Features	1

Metric	Value
c	2
b	0
f	1
dl	0
loc	10
ccs	8
cts	8
cp	1
rs	9.4286
cc	1
eloc	6
nc	1
nop	1
crap	1

<?php

namespace Http\Client\Plugin;

use Http\Client\Tools\Promise\FulfilledPromise;
use Http\Message\StreamFactory;
use Psr\Cache\CacheItemPoolInterface;
use Psr\Http\Message\RequestInterface;
use Psr\Http\Message\ResponseInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;

/**
 * Allow for caching a response.
 *
 * @author Tobias Nyholm <[email protected]>
 */
class CachePlugin implements Plugin
{
    /**
     * @var CacheItemPoolInterface
     */
    private $pool;

    /**
     * @var StreamFactory
     */
    private $streamFactory;

    /**
     * @var array
     */
    private $config;

    /**
     * Available options are
     *  - respect_cache_headers: Whether to look at the cache directives or ignore them.
     *  - default_ttl: If we do not respect cache headers or can't calculate a good ttl, use this value.
     *
     * @param CacheItemPoolInterface $pool
     * @param StreamFactory          $streamFactory
     * @param array                  $config
     */
    public function __construct(CacheItemPoolInterface $pool, StreamFactory $streamFactory, array $config = [])
    {
        $this->pool = $pool;
        $this->streamFactory = $streamFactory;

        $optionsResolver = new OptionsResolver();
        $this->configureOptions($optionsResolver);
        $this->config = $optionsResolver->resolve($config);
    }

    /**
     * {@inheritdoc}
     */
    public function handleRequest(RequestInterface $request, callable $next, callable $first)
    {
        $method = strtoupper($request->getMethod());

        // if the request not is cachable, move to $next
        if ($method !== 'GET' && $method !== 'HEAD') {
            return $next($request);
        }

        // If we can cache the request
        $key = $this->createCacheKey($request);
        $cacheItem = $this->pool->getItem($key);

        if ($cacheItem->isHit()) {
            // return cached response
            $data = $cacheItem->get();
            $response = $data['response'];
            $response = $response->withBody($this->streamFactory->createStream($data['body']));

            return new FulfilledPromise($response);
        }

        return $next($request)->then(function (ResponseInterface $response) use ($cacheItem) {
            if ($this->isCacheable($response)) {
                $bodyStream = $response->getBody();
                $body = $bodyStream->__toString();
                if ($bodyStream->isSeekable()) {
                    $bodyStream->rewind();
                } else {
                    $response = $response->withBody($this->streamFactory->createStream($body));
                }

                $cacheItem->set(['response' => $response, 'body' => $body])
                    ->expiresAfter($this->getMaxAge($response));
                $this->pool->save($cacheItem);
            }

            return $response;
        });
    }

    /**
     * Verify that we can cache this response.
     *
     * @param ResponseInterface $response
     *
     * @return bool
     */
    protected function isCacheable(ResponseInterface $response)
    {
        if (!in_array($response->getStatusCode(), [200, 203, 300, 301, 302, 404, 410])) {
            return false;
        }
        if (!$this->config['respect_cache_headers']) {
            return true;
        }
        if ($this->getCacheControlDirective($response, 'no-store') || $this->getCacheControlDirective($response, 'private')) {
            return false;
        }

        return true;
    }

    /**
     * Get the value of a parameter in the cache control header.
     *
     * @param ResponseInterface $response
     * @param string            $name     The field of Cache-Control to fetch
     *
     * @return bool|string The value of the directive, true if directive without value, false if directive not present.
     */
    private function getCacheControlDirective(ResponseInterface $response, $name)
    {
        $headers = $response->getHeader('Cache-Control');
        foreach ($headers as $header) {
            if (preg_match(sprintf('|%s=?([0-9]+)?|i', $name), $header, $matches)) {

                // return the value for $name if it exists
                if (isset($matches[1])) {
                    return $matches[1];
                }

                return true;
            }
        }

        return false;
    }

    /**
     * @param RequestInterface $request
     *
     * @return string
     */
    private function createCacheKey(RequestInterface $request)
    {
        return md5($request->getMethod().' '.$request->getUri());
    }

    /**
     * Get a ttl in seconds. It could return null if we do not respect cache headers and got no defaultTtl.
     *
     * @param ResponseInterface $response
     *
     * @return int|null
     */
    private function getMaxAge(ResponseInterface $response)
    {
        if (!$this->config['respect_cache_headers']) {
            return $this->config['default_ttl'];
        }

        // check for max age in the Cache-Control header
        $maxAge = $this->getCacheControlDirective($response, 'max-age');
        if (!is_bool($maxAge)) {
            $ageHeaders = $response->getHeader('Age');
            foreach ($ageHeaders as $age) {
                return $maxAge - ((int) $age);
            }

            return $maxAge;
        }

        // check for ttl in the Expires header
        $headers = $response->getHeader('Expires');
        foreach ($headers as $header) {
            return (new \DateTime($header))->getTimestamp() - (new \DateTime())->getTimestamp();
        }

        return $this->config['default_ttl'];
    }

    /**
     * Configure an options resolver.
     *
     * @param OptionsResolver $resolver
     */
    private function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults([
            'default_ttl' => null,
            'respect_cache_headers' => true,
        ]);

        $resolver->setAllowedTypes('default_ttl', ['int', 'null']);
        $resolver->setAllowedTypes('respect_cache_headers', 'bool');
    }
}


1		<?php
2
3		namespace Http\Client\Plugin;
4
5		use Http\Client\Tools\Promise\FulfilledPromise;
6		use Http\Message\StreamFactory;
7		use Psr\Cache\CacheItemPoolInterface;
8		use Psr\Http\Message\RequestInterface;
9		use Psr\Http\Message\ResponseInterface;
10		use Symfony\Component\OptionsResolver\OptionsResolver;
11
12		/**
13		* Allow for caching a response.
14		*
15		* @author Tobias Nyholm <[email protected]>
16		*/
17		class CachePlugin implements Plugin
18		{
19		/**
20		* @var CacheItemPoolInterface
21		*/
22		private $pool;
23
24		/**
25		* @var StreamFactory
26		*/
27		private $streamFactory;
28
29		/**
30		* @var array
31		*/
32		private $config;
33
34		/**
35		* Available options are
36		* - respect_cache_headers: Whether to look at the cache directives or ignore them.
37		* - default_ttl: If we do not respect cache headers or can't calculate a good ttl, use this value.
38		*
39		* @param CacheItemPoolInterface $pool
40		* @param StreamFactory $streamFactory
41		* @param array $config
42		*/
43	6	public function __construct(CacheItemPoolInterface $pool, StreamFactory $streamFactory, array $config = [])
44		{
45	6	$this->pool = $pool;
46	6	$this->streamFactory = $streamFactory;
47
48	6	$optionsResolver = new OptionsResolver();
49	6	$this->configureOptions($optionsResolver);
50	6	$this->config = $optionsResolver->resolve($config);
51	6	}
52
53		/**
54		* {@inheritdoc}
55		*/
56	4	public function handleRequest(RequestInterface $request, callable $next, callable $first)
57		{
58	4	$method = strtoupper($request->getMethod());
59
60		// if the request not is cachable, move to $next
61	4	if ($method !== 'GET' && $method !== 'HEAD') {
62	1	return $next($request);
63		}
64
65		// If we can cache the request
66	3	$key = $this->createCacheKey($request);
67	3	$cacheItem = $this->pool->getItem($key);
68
69	3	if ($cacheItem->isHit()) {
70		// return cached response
71		$data = $cacheItem->get();
72		$response = $data['response'];
73		$response = $response->withBody($this->streamFactory->createStream($data['body']));
74
75		return new FulfilledPromise($response);
76		}
77
78	3	return $next($request)->then(function (ResponseInterface $response) use ($cacheItem) {
79	3	if ($this->isCacheable($response)) {
80	2	$bodyStream = $response->getBody();
81	2	$body = $bodyStream->__toString();
82	2	if ($bodyStream->isSeekable()) {
83	2	$bodyStream->rewind();
84	2	} else {
85		$response = $response->withBody($this->streamFactory->createStream($body));
86		}
87
88	2	$cacheItem->set(['response' => $response, 'body' => $body])
89	2	->expiresAfter($this->getMaxAge($response));
90	2	$this->pool->save($cacheItem);
91	2	}
92
93	3	return $response;
94	3	});
95		}
96
97		/**
98		* Verify that we can cache this response.
99		*
100		* @param ResponseInterface $response
101		*
102		* @return bool
103		*/
104	3	protected function isCacheable(ResponseInterface $response)
105		{
106	3	if (!in_array($response->getStatusCode(), [200, 203, 300, 301, 302, 404, 410])) {
107	1	return false;
108		}
109	2	if (!$this->config['respect_cache_headers']) {
110		return true;
111		}
112	2	if ($this->getCacheControlDirective($response, 'no-store') \|\| $this->getCacheControlDirective($response, 'private')) {
113		return false;
114		}
115
116	2	return true;
117		}
118
119		/**
120		* Get the value of a parameter in the cache control header.
121		*
122		* @param ResponseInterface $response
123		* @param string $name The field of Cache-Control to fetch
124		*
125		* @return bool\|string The value of the directive, true if directive without value, false if directive not present.
126		*/
127	2	private function getCacheControlDirective(ResponseInterface $response, $name)
128		{
129	2	$headers = $response->getHeader('Cache-Control');
130	2	foreach ($headers as $header) {
131	1	if (preg_match(sprintf('\|%s=?([0-9]+)?\|i', $name), $header, $matches)) {
132
133		// return the value for $name if it exists
134	1	if (isset($matches[1])) {
135	1	return $matches[1];
136		}
137
138		return true;
139		}
140	2	}
141
142	2	return false;
143		}
144
145		/**
146		* @param RequestInterface $request
147		*
148		* @return string
149		*/
150	3	private function createCacheKey(RequestInterface $request)
151		{
152	3	return md5($request->getMethod().' '.$request->getUri());
153		}
154
155		/**
156		* Get a ttl in seconds. It could return null if we do not respect cache headers and got no defaultTtl.
157		*
158		* @param ResponseInterface $response
159		*
160		* @return int\|null
161		*/
162	2	private function getMaxAge(ResponseInterface $response)
163		{
164	2	if (!$this->config['respect_cache_headers']) {
165		return $this->config['default_ttl'];
166		}
167
168		// check for max age in the Cache-Control header
169	2	$maxAge = $this->getCacheControlDirective($response, 'max-age');
170	2	if (!is_bool($maxAge)) {
171	1	$ageHeaders = $response->getHeader('Age');
172	1	foreach ($ageHeaders as $age) {
173	1	return $maxAge - ((int) $age);
174		}
175
176		return $maxAge;
177		}
178
179		// check for ttl in the Expires header
180	1	$headers = $response->getHeader('Expires');
181	1	foreach ($headers as $header) {
182		return (new \DateTime($header))->getTimestamp() - (new \DateTime())->getTimestamp();
183	1	}
184
185	1	return $this->config['default_ttl'];
186		}
187
188		/**
189		* Configure an options resolver.
190		*
191		* @param OptionsResolver $resolver
192		*/
193	6	private function configureOptions(OptionsResolver $resolver)
194		{
195	6	$resolver->setDefaults([
196	6	'default_ttl' => null,
197	6	'respect_cache_headers' => true,
198	6	]);
199
200	6	$resolver->setAllowedTypes('default_ttl', ['int', 'null']);
201	6	$resolver->setAllowedTypes('respect_cache_headers', 'bool');
202	6	}
203		}
204

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CachePlugin::configureOptions() A

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