PageCache::updateDynamicContent() - Code Metrics - Inspection of "Updated docs, minor" - yiisoft/yii2 - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — cache-closure ( 7d9053...380edd )

by Dmitry

created 2016-12-30 20:47 UTC

PageCache::updateDynamicContent() A

↳ Parent: PageCache

Complexity

Conditions	2
Paths	2

Size

Total Lines	8
Code Lines	4

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	5
CRAP Score	2

Importance

Changes

Metric	Value
dl	0
loc	8
ccs	5
cts	5
cp	1
rs	9.4285
c	0
b	0
f	0
cc	2
eloc	4
nc	2
nop	2
crap	2

<?php
/**
 * @link http://www.yiiframework.com/
 * @copyright Copyright (c) 2008 Yii Software LLC
 * @license http://www.yiiframework.com/license/
 */

namespace yii\filters;

use Yii;
use yii\base\Action;
use yii\base\ActionFilter;
use yii\caching\Cache;
use yii\caching\Dependency;
use yii\di\Instance;
use yii\web\Response;

/**
 * PageCache implements server-side caching of whole pages.
 *
 * It is an action filter that can be added to a controller and handles the `beforeAction` event.
 *
 * To use PageCache, declare it in the `behaviors()` method of your controller class.
 * In the following example the filter will be applied to the `index` action and
 * cache the whole page for maximum 60 seconds or until the count of entries in the post table changes.
 * It also stores different versions of the page depending on the application language.
 *
 * ```php
 * public function behaviors()
 * {
 *     return [
 *         'pageCache' => [
 *             'class' => 'yii\filters\PageCache',
 *             'only' => ['index'],
 *             'duration' => 60,
 *             'dependency' => [
 *                 'class' => 'yii\caching\DbDependency',
 *                 'sql' => 'SELECT COUNT(*) FROM post',
 *             ],
 *             'variations' => [
 *                 \Yii::$app->language,
 *             ]
 *         ],
 *     ];
 * }
 * ```
 *
 * @author Qiang Xue <[email protected]>
 * @author Sergey Makinen <[email protected]>
 * @since 2.0
 */
class PageCache extends ActionFilter
{
    /**
     * @var bool whether the content being cached should be differentiated according to the route.
     * A route consists of the requested controller ID and action ID. Defaults to `true`.
     */
    public $varyByRoute = true;
    /**
     * @var Cache|array|string the cache object or the application component ID of the cache object.
     * After the PageCache object is created, if you want to change this property,
     * you should only assign it with a cache object.
     * Starting from version 2.0.2, this can also be a configuration array for creating the object.
     */
    public $cache = 'cache';
    /**
     * @var int number of seconds that the data can remain valid in cache.
     * Use `0` to indicate that the cached data will never expire.
     */
    public $duration = 60;
    /**
     * @var array|Dependency the dependency that the cached content depends on.
     * This can be either a [[Dependency]] object or a configuration array for creating the dependency object.
     * For example,
     *
     * ```php
     * [
     *     'class' => 'yii\caching\DbDependency',
     *     'sql' => 'SELECT MAX(updated_at) FROM post',
     * ]
     * ```
     *
     * would make the output cache depend on the last modified time of all posts.
     * If any post has its modification time changed, the cached content would be invalidated.
     *
     * If [[cacheCookies]] or [[cacheHeaders]] is enabled, then [[\yii\caching\Dependency::reusable]] should be enabled as well to save performance.
     * This is because the cookies and headers are currently stored separately from the actual page content, causing the dependency to be evaluated twice.
     */
    public $dependency;
    /**
     * @var array list of factors that would cause the variation of the content being cached.
     * Each factor is a string representing a variation (e.g. the language, a GET parameter).
     * The following variation setting will cause the content to be cached in different versions
     * according to the current application language:
     *
     * ```php
     * [
     *     Yii::$app->language,
     * ]
     * ```
     */
    public $variations;
    /**
     * @var bool whether to enable the page cache. You may use this property to turn on and off
     * the page cache according to specific setting (e.g. enable page cache only for GET requests).
     */
    public $enabled = true;
    /**
     * @var \yii\base\View the view component to use for caching. If not set, the default application view component
     * [[\yii\web\Application::view]] will be used.
     */
    public $view;
    /**
     * @var bool|array a boolean value indicating whether to cache all cookies, or an array of
     * cookie names indicating which cookies can be cached. Be very careful with caching cookies, because
     * it may leak sensitive or private data stored in cookies to unwanted users.
     * @since 2.0.4
     */
    public $cacheCookies = false;
    /**
     * @var bool|array a boolean value indicating whether to cache all HTTP headers, or an array of
     * HTTP header names (case-insensitive) indicating which HTTP headers can be cached.
     * Note if your HTTP headers contain sensitive information, you should white-list which headers can be cached.
     * @since 2.0.4
     */
    public $cacheHeaders = true;
    /**
     * @var array a list of placeholders for embedding dynamic contents. This property
     * is used internally to implement the content caching feature. Do not modify it.
     * @internal
     * @since 2.0.11
     */
    public $dynamicPlaceholders;


    /**
     * @inheritdoc
     */
    public function init()
    {
        parent::init();
        if ($this->view === null) {
            $this->view = Yii::$app->getView();
        }
    }

    /**
     * This method is invoked right before an action is to be executed (after all possible filters.)
     * You may override this method to do last-minute preparation for the action.
     * @param Action $action the action to be executed.
     * @return bool whether the action should continue to be executed.
     */
    public function beforeAction($action)
    {
        if (!$this->enabled) {
            return true;
        }

        $this->cache = Instance::ensure($this->cache, Cache::className());

        if (is_array($this->dependency)) {
            $this->dependency = Yii::createObject($this->dependency);
        }

        $response = Yii::$app->getResponse();
        $data = $this->cache->get($this->calculateCacheKey());
        if (!is_array($data) || !isset($data['cacheVersion']) || $data['cacheVersion'] !== 1) {
            $this->view->cacheStack[] = $this;
            ob_start();
            ob_implicit_flush(false);
            $response->on(Response::EVENT_AFTER_SEND, [$this, 'cacheResponse']);
            Yii::trace('Valid page content is not found in the cache.', __METHOD__);
            return true;
        } else {
            $this->restoreResponse($response, $data);
            Yii::trace('Valid page content is found in the cache.', __METHOD__);
            return false;
        }
    }

    /**
     * This method is invoked right before the response caching is to be started.
     * You may override this method to cancel caching by returning `false` or store an additional data
     * in a cache entry by returning an array instead of `true`.
     * @return bool|array whether to cache or not, return an array instead of `true` to store an additional data.
     * @since 2.0.11
     */
    public function beforeCacheResponse()
    {
        return true;
    }

    /**
     * This method is invoked right after the response restoring is finished (but before the response is sent).
     * You may override this method to do last-minute preparation before the response is sent.
     * @param array|null $data an array of an additional data stored in a cache entry or `null`.
     * @since 2.0.11
     */
    public function afterRestoreResponse($data)

    {
    }

    /**
     * Restores response properties from the given data.
     * @param Response $response the response to be restored.
     * @param array $data the response property data.
     * @since 2.0.3
     */
    protected function restoreResponse($response, $data)
    {
        foreach (['format', 'version', 'statusCode', 'statusText', 'content'] as $name) {
            $response->{$name} = $data[$name];
        }
        foreach (['headers', 'cookies'] as $name) {
            if (isset($data[$name]) && is_array($data[$name])) {
                $response->{$name}->fromArray(array_merge($data[$name], $response->{$name}->toArray()));
            }
        }
        if (!empty($data['dynamicPlaceholders']) && is_array($data['dynamicPlaceholders'])) {
            if (empty($this->view->cacheStack)) {
                // outermost cache: replace placeholder with dynamic content
                $response->content = $this->updateDynamicContent($response->content, $data['dynamicPlaceholders']);
            }
            foreach ($data['dynamicPlaceholders'] as $name => $statements) {
                $this->view->addDynamicPlaceholder($name, $statements);
            }
        }
        $this->afterRestoreResponse(isset($data['cacheData']) ? $data['cacheData'] : null);
    }

    /**
     * Caches response properties.
     * @since 2.0.3
     */
    public function cacheResponse()
    {
        array_pop($this->view->cacheStack);
        $beforeCacheResponseResult = $this->beforeCacheResponse();
        if ($beforeCacheResponseResult === false) {
            $content = ob_get_clean();
            if (empty($this->view->cacheStack) && !empty($this->dynamicPlaceholders)) {
                $content = $this->updateDynamicContent($content, $this->dynamicPlaceholders);
            }
            echo $content;
            return;
        }

        $response = Yii::$app->getResponse();
        $data = [
            'cacheVersion' => 1,
            'cacheData' => is_array($beforeCacheResponseResult) ? $beforeCacheResponseResult : null,
            'content' => ob_get_clean()
        ];
        if ($data['content'] === false || $data['content'] === '') {
            return;
        }

        $data['dynamicPlaceholders'] = $this->dynamicPlaceholders;
        foreach (['format', 'version', 'statusCode', 'statusText'] as $name) {
            $data[$name] = $response->{$name};
        }
        $this->insertResponseCollectionIntoData($response, 'headers', $data);
        $this->insertResponseCollectionIntoData($response, 'cookies', $data);
        $this->cache->set($this->calculateCacheKey(), $data, $this->duration, $this->dependency);
        if (empty($this->view->cacheStack) && !empty($this->dynamicPlaceholders)) {
            $data['content'] = $this->updateDynamicContent($data['content'], $this->dynamicPlaceholders);
        }
        echo $data['content'];
    }

    /**
     * Inserts (or filters/ignores according to config) response headers/cookies into a cache data array.
     * @param Response $response the response.
     * @param string $collectionName currently it's `headers` or `cookies`.
     * @param array $data the cache data.
     */
    private function insertResponseCollectionIntoData(Response $response, $collectionName, array &$data)
    {
        $property = 'cache' . ucfirst($collectionName);
        if ($this->{$property} === false) {
            return;
        }

        $all = $response->{$collectionName}->toArray();
        if (is_array($this->{$property})) {
            $filtered = [];
            foreach ($this->{$property} as $name) {
                if ($collectionName === 'headers') {
                    $name = strtolower($name);
                }
                if (isset($all[$name])) {
                    $filtered[$name] = $all[$name];
                }
            }
            $all = $filtered;
        }
        $data[$collectionName] = $all;
    }

    /**
     * Replaces placeholders in content by results of evaluated dynamic statements.
     * @param string $content content to be parsed.
     * @param array $placeholders placeholders and their values.
     * @return string final content.
     * @since 2.0.11
     */
    protected function updateDynamicContent($content, $placeholders)
    {
        foreach ($placeholders as $name => $statements) {
            $placeholders[$name] = $this->view->evaluateDynamicContent($statements);
        }

        return strtr($content, $placeholders);
    }

    /**
     * @return array the key used to cache response properties.
     * @since 2.0.3
     */
    protected function calculateCacheKey()
    {
        $key = [__CLASS__];
        if ($this->varyByRoute) {
            $key[] = Yii::$app->requestedRoute;
        }
        if (is_array($this->variations)) {
            foreach ($this->variations as $value) {
                $key[] = $value;
            }
        }
        return $key;
    }
}


1		<?php
2		/**
3		* @link http://www.yiiframework.com/
4		* @copyright Copyright (c) 2008 Yii Software LLC
5		* @license http://www.yiiframework.com/license/
6		*/
7
8		namespace yii\filters;
9
10		use Yii;
11		use yii\base\Action;
12		use yii\base\ActionFilter;
13		use yii\caching\Cache;
14		use yii\caching\Dependency;
15		use yii\di\Instance;
16		use yii\web\Response;
17
18		/**
19		* PageCache implements server-side caching of whole pages.
20		*
21		* It is an action filter that can be added to a controller and handles the `beforeAction` event.
22		*
23		* To use PageCache, declare it in the `behaviors()` method of your controller class.
24		* In the following example the filter will be applied to the `index` action and
25		* cache the whole page for maximum 60 seconds or until the count of entries in the post table changes.
26		* It also stores different versions of the page depending on the application language.
27		*
28		* ```php
29		* public function behaviors()
30		* {
31		* return [
32		* 'pageCache' => [
33		* 'class' => 'yii\filters\PageCache',
34		* 'only' => ['index'],
35		* 'duration' => 60,
36		* 'dependency' => [
37		* 'class' => 'yii\caching\DbDependency',
38		* 'sql' => 'SELECT COUNT(*) FROM post',
39		* ],
40		* 'variations' => [
41		* \Yii::$app->language,
42		* ]
43		* ],
44		* ];
45		* }
46		* ```
47		*
48		* @author Qiang Xue <[email protected]>
49		* @author Sergey Makinen <[email protected]>
50		* @since 2.0
51		*/
52		class PageCache extends ActionFilter
53		{
54		/**
55		* @var bool whether the content being cached should be differentiated according to the route.
56		* A route consists of the requested controller ID and action ID. Defaults to `true`.
57		*/
58		public $varyByRoute = true;
59		/**
60		* @var Cache\|array\|string the cache object or the application component ID of the cache object.
61		* After the PageCache object is created, if you want to change this property,
62		* you should only assign it with a cache object.
63		* Starting from version 2.0.2, this can also be a configuration array for creating the object.
64		*/
65		public $cache = 'cache';
66		/**
67		* @var int number of seconds that the data can remain valid in cache.
68		* Use `0` to indicate that the cached data will never expire.
69		*/
70		public $duration = 60;
71		/**
72		* @var array\|Dependency the dependency that the cached content depends on.
73		* This can be either a [[Dependency]] object or a configuration array for creating the dependency object.
74		* For example,
75		*
76		* ```php
77		* [
78		* 'class' => 'yii\caching\DbDependency',
79		* 'sql' => 'SELECT MAX(updated_at) FROM post',
80		* ]
81		* ```
82		*
83		* would make the output cache depend on the last modified time of all posts.
84		* If any post has its modification time changed, the cached content would be invalidated.
85		*
86		* If [[cacheCookies]] or [[cacheHeaders]] is enabled, then [[\yii\caching\Dependency::reusable]] should be enabled as well to save performance.
87		* This is because the cookies and headers are currently stored separately from the actual page content, causing the dependency to be evaluated twice.
88		*/
89		public $dependency;
90		/**
91		* @var array list of factors that would cause the variation of the content being cached.
92		* Each factor is a string representing a variation (e.g. the language, a GET parameter).
93		* The following variation setting will cause the content to be cached in different versions
94		* according to the current application language:
95		*
96		* ```php
97		* [
98		* Yii::$app->language,
99		* ]
100		* ```
101		*/
102		public $variations;
103		/**
104		* @var bool whether to enable the page cache. You may use this property to turn on and off
105		* the page cache according to specific setting (e.g. enable page cache only for GET requests).
106		*/
107		public $enabled = true;
108		/**
109		* @var \yii\base\View the view component to use for caching. If not set, the default application view component
110		* [[\yii\web\Application::view]] will be used.
111		*/
112		public $view;
113		/**
114		* @var bool\|array a boolean value indicating whether to cache all cookies, or an array of
115		* cookie names indicating which cookies can be cached. Be very careful with caching cookies, because
116		* it may leak sensitive or private data stored in cookies to unwanted users.
117		* @since 2.0.4
118		*/
119		public $cacheCookies = false;
120		/**
121		* @var bool\|array a boolean value indicating whether to cache all HTTP headers, or an array of
122		* HTTP header names (case-insensitive) indicating which HTTP headers can be cached.
123		* Note if your HTTP headers contain sensitive information, you should white-list which headers can be cached.
124		* @since 2.0.4
125		*/
126		public $cacheHeaders = true;
127		/**
128		* @var array a list of placeholders for embedding dynamic contents. This property
129		* is used internally to implement the content caching feature. Do not modify it.
130		* @internal
131		* @since 2.0.11
132		*/
133		public $dynamicPlaceholders;
134
135
136		/**
137		* @inheritdoc
138		*/
139	14	public function init()
140		{
141	14	parent::init();
142	14	if ($this->view === null) {
143	1	$this->view = Yii::$app->getView();
144	1	}
145	14	}
146
147		/**
148		* This method is invoked right before an action is to be executed (after all possible filters.)
149		* You may override this method to do last-minute preparation for the action.
150		* @param Action $action the action to be executed.
151		* @return bool whether the action should continue to be executed.
152		*/
153	13	public function beforeAction($action)
154		{
155	13	if (!$this->enabled) {
156	1	return true;
157		}
158
159	12	$this->cache = Instance::ensure($this->cache, Cache::className());
160
161	12	if (is_array($this->dependency)) {
162	1	$this->dependency = Yii::createObject($this->dependency);
163	1	}
164
165	12	$response = Yii::$app->getResponse();
166	12	$data = $this->cache->get($this->calculateCacheKey());
167	12	if (!is_array($data) \|\| !isset($data['cacheVersion']) \|\| $data['cacheVersion'] !== 1) {
168	12	$this->view->cacheStack[] = $this;
169	12	ob_start();
170	12	ob_implicit_flush(false);
171	12	$response->on(Response::EVENT_AFTER_SEND, [$this, 'cacheResponse']);
172	12	Yii::trace('Valid page content is not found in the cache.', __METHOD__);
173	12	return true;
174		} else {
175	11	$this->restoreResponse($response, $data);
176	11	Yii::trace('Valid page content is found in the cache.', __METHOD__);
177	11	return false;
178		}
179		}
180
181		/**
182		* This method is invoked right before the response caching is to be started.
183		* You may override this method to cancel caching by returning `false` or store an additional data
184		* in a cache entry by returning an array instead of `true`.
185		* @return bool\|array whether to cache or not, return an array instead of `true` to store an additional data.
186		* @since 2.0.11
187		*/
188	12	public function beforeCacheResponse()
189		{
190	12	return true;
191		}
192
193		/**
194		* This method is invoked right after the response restoring is finished (but before the response is sent).
195		* You may override this method to do last-minute preparation before the response is sent.
196		* @param array\|null $data an array of an additional data stored in a cache entry or `null`.
197		* @since 2.0.11
198		*/
199	11	public function afterRestoreResponse($data)
		0 ignored issues – show Unused Code introduced 2016-08-12 12:24 UTC by Report Bug Copy Issue Report The parameter `$data` is not used and could be removed. This check looks from parameters that have been defined for a function or method, but which are not used in the method body. Loading history...
200		{
201	11	}
202
203		/**
204		* Restores response properties from the given data.
205		* @param Response $response the response to be restored.
206		* @param array $data the response property data.
207		* @since 2.0.3
208		*/
209	11	protected function restoreResponse($response, $data)
210		{
211	11	foreach (['format', 'version', 'statusCode', 'statusText', 'content'] as $name) {
212	11	$response->{$name} = $data[$name];
213	11	}
214	11	foreach (['headers', 'cookies'] as $name) {
215	11	if (isset($data[$name]) && is_array($data[$name])) {
216	10	$response->{$name}->fromArray(array_merge($data[$name], $response->{$name}->toArray()));
217	10	}
218	11	}
219	11	if (!empty($data['dynamicPlaceholders']) && is_array($data['dynamicPlaceholders'])) {
220	11	if (empty($this->view->cacheStack)) {
221		// outermost cache: replace placeholder with dynamic content
222	11	$response->content = $this->updateDynamicContent($response->content, $data['dynamicPlaceholders']);
223	11	}
224	11	foreach ($data['dynamicPlaceholders'] as $name => $statements) {
225	11	$this->view->addDynamicPlaceholder($name, $statements);
226	11	}
227	11	}
228	11	$this->afterRestoreResponse(isset($data['cacheData']) ? $data['cacheData'] : null);
229	11	}
230
231		/**
232		* Caches response properties.
233		* @since 2.0.3
234		*/
235	12	public function cacheResponse()
236		{
237	12	array_pop($this->view->cacheStack);
238	12	$beforeCacheResponseResult = $this->beforeCacheResponse();
239	12	if ($beforeCacheResponseResult === false) {
240		$content = ob_get_clean();
241		if (empty($this->view->cacheStack) && !empty($this->dynamicPlaceholders)) {
242		$content = $this->updateDynamicContent($content, $this->dynamicPlaceholders);
243		}
244		echo $content;
245		return;
246		}
247
248	12	$response = Yii::$app->getResponse();
249		$data = [
250	12	'cacheVersion' => 1,
251	12	'cacheData' => is_array($beforeCacheResponseResult) ? $beforeCacheResponseResult : null,
252	12	'content' => ob_get_clean()
253	12	];
254	12	if ($data['content'] === false \|\| $data['content'] === '') {
255	4	return;
256		}
257
258	12	$data['dynamicPlaceholders'] = $this->dynamicPlaceholders;
259	12	foreach (['format', 'version', 'statusCode', 'statusText'] as $name) {
260	12	$data[$name] = $response->{$name};
261	12	}
262	12	$this->insertResponseCollectionIntoData($response, 'headers', $data);
263	12	$this->insertResponseCollectionIntoData($response, 'cookies', $data);
264	12	$this->cache->set($this->calculateCacheKey(), $data, $this->duration, $this->dependency);
265	12	if (empty($this->view->cacheStack) && !empty($this->dynamicPlaceholders)) {
266	12	$data['content'] = $this->updateDynamicContent($data['content'], $this->dynamicPlaceholders);
267	12	}
268	12	echo $data['content'];
269	12	}
270
271		/**
272		* Inserts (or filters/ignores according to config) response headers/cookies into a cache data array.
273		* @param Response $response the response.
274		* @param string $collectionName currently it's `headers` or `cookies`.
275		* @param array $data the cache data.
276		*/
277	12	private function insertResponseCollectionIntoData(Response $response, $collectionName, array &$data)
278		{
279	12	$property = 'cache' . ucfirst($collectionName);
280	12	if ($this->{$property} === false) {
281	9	return;
282		}
283
284	11	$all = $response->{$collectionName}->toArray();
285	11	if (is_array($this->{$property})) {
286	3	$filtered = [];
287	3	foreach ($this->{$property} as $name) {
288	3	if ($collectionName === 'headers') {
289	2	$name = strtolower($name);
290	2	}
291	3	if (isset($all[$name])) {
292	3	$filtered[$name] = $all[$name];
293	3	}
294	3	}
295	3	$all = $filtered;
296	3	}
297	11	$data[$collectionName] = $all;
298	11	}
299
300		/**
301		* Replaces placeholders in content by results of evaluated dynamic statements.
302		* @param string $content content to be parsed.
303		* @param array $placeholders placeholders and their values.
304		* @return string final content.
305		* @since 2.0.11
306		*/
307	12	protected function updateDynamicContent($content, $placeholders)
308		{
309	12	foreach ($placeholders as $name => $statements) {
310	12	$placeholders[$name] = $this->view->evaluateDynamicContent($statements);
311	12	}
312
313	12	return strtr($content, $placeholders);
314		}
315
316		/**
317		* @return array the key used to cache response properties.
318		* @since 2.0.3
319		*/
320	12	protected function calculateCacheKey()
321		{
322	12	$key = [__CLASS__];
323	12	if ($this->varyByRoute) {
324	12	$key[] = Yii::$app->requestedRoute;
325	12	}
326	12	if (is_array($this->variations)) {
327	1	foreach ($this->variations as $value) {
328	1	$key[] = $value;
329	1	}
330	1	}
331	12	return $key;
332		}
333		}
334

yiisoft / yii2

Push — cache-closure ( 7d9053...380edd )

PageCache::updateDynamicContent() A

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