HttpDispatcher::flush() - Code Metrics - Inspection of "Implemented TagHeaderFormatter interface" - FriendsOfSymfony/FOSHttpCache - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#353)

by Yanick

created 2017-05-22 13:32 UTC

HttpDispatcher::flush() D

↳ Parent: HttpDispatcher

Complexity

Conditions	9
Paths	40

Size

Total Lines	39
Code Lines	23

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	19
CRAP Score	9.0101

Importance

Changes

Metric	Value
dl	0
loc	39
ccs	19
cts	20
cp	0.95
rs	4.909
c	0
b	0
f	0
cc	9
eloc	23
nc	40
nop	0
crap	9.0101

<?php

/*
 * This file is part of the FOSHttpCache package.
 *
 * (c) FriendsOfSymfony <http://friendsofsymfony.github.com/>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace FOS\HttpCache\ProxyClient;

use FOS\HttpCache\Exception\ExceptionCollection;
use FOS\HttpCache\Exception\InvalidArgumentException;
use FOS\HttpCache\Exception\InvalidUrlException;
use FOS\HttpCache\Exception\MissingHostException;
use FOS\HttpCache\Exception\ProxyResponseException;
use FOS\HttpCache\Exception\ProxyUnreachableException;
use Http\Client\Common\Plugin\ErrorPlugin;
use Http\Client\Common\PluginClient;
use Http\Client\Exception\HttpException;
use Http\Client\Exception\RequestException;
use Http\Client\HttpAsyncClient;
use Http\Discovery\HttpAsyncClientDiscovery;
use Http\Discovery\UriFactoryDiscovery;
use Http\Message\UriFactory;
use Http\Promise\Promise;
use Psr\Http\Message\RequestInterface;
use Psr\Http\Message\UriInterface;

/**
 * Queue and send HTTP requests with a Httplug asynchronous client.
 *
 * @author David Buchmann <[email protected]>
 */
class HttpDispatcher
{
    /**
     * @var HttpAsyncClient
     */
    private $httpClient;

    /**
     * @var UriFactory
     */
    private $uriFactory;

    /**
     * Queued requests.
     *
     * @var RequestInterface[]
     */
    private $queue = [];

    /**
     * Caching proxy server host names or IP addresses.
     *
     * @var UriInterface[]
     */
    private $servers;

    /**
     * Application host name and optional base URL.
     *
     * @var UriInterface
     */
    private $baseUri;

    /**
     * If you specify a custom HTTP client, make sure that it converts HTTP
     * errors to exceptions.
     *
     * If your proxy server IPs can not be statically configured, extend this
     * class and overwrite getServers. Be sure to have some caching in
     * getServers.
     *
     * @param string[]             $servers    Caching proxy server hostnames or IP
     *                                         addresses, including port if not port 80.
     *                                         E.g. ['127.0.0.1:6081']
     * @param string               $baseUri    Default application hostname, optionally
     *                                         including base URL, for purge and refresh
     *                                         requests (optional). This is required if
     *                                         you purge and refresh paths instead of
     *                                         absolute URLs
     * @param HttpAsyncClient|null $httpClient Client capable of sending HTTP requests. If no
     *                                         client is supplied, a default one is created
     * @param UriFactory|null      $uriFactory Factory for PSR-7 URIs. If not specified, a
     *                                         default one is created
     */
    public function __construct(
        array $servers,
        $baseUri = '',
        HttpAsyncClient $httpClient = null,
        UriFactory $uriFactory = null
    ) {
        if (!$httpClient) {
            $httpClient = new PluginClient(
                HttpAsyncClientDiscovery::find(),
                [new ErrorPlugin()]
            );
        }
        $this->httpClient = $httpClient;
        $this->uriFactory = $uriFactory ?: UriFactoryDiscovery::find();

        $this->setServers($servers);
        $this->setBaseUri($baseUri);
    }

    /**
     * Queue invalidation request.
     *
     * @param RequestInterface $invalidationRequest
     */
    public function invalidate(RequestInterface $invalidationRequest)
    {
        if (!$this->baseUri && !$invalidationRequest->getUri()->getHost()) {
            throw MissingHostException::missingHost((string) $invalidationRequest->getUri());
        }

        $signature = $this->getRequestSignature($invalidationRequest);

        if (isset($this->queue[$signature])) {
            return;
        }

        $this->queue[$signature] = $invalidationRequest;
    }

    /**
     * Send all pending invalidation requests and make sure the requests have terminated and gather exceptions.
     *
     * @return int The number of cache invalidations performed per caching server
     *
     * @throws ExceptionCollection If any errors occurred during flush
     */
    public function flush()
    {
        $queue = $this->queue;
        $this->queue = [];
        /** @var Promise[] $promises */
        $promises = [];

        $exceptions = new ExceptionCollection();

        foreach ($queue as $request) {
            foreach ($this->fanOut($request) as $proxyRequest) {
                try {
                    $promises[] = $this->httpClient->sendAsyncRequest($proxyRequest);
                } catch (\Exception $e) {
                    $exceptions->add(new InvalidArgumentException($e));
                }
            }
        }

        foreach ($promises as $promise) {
            try {
                $promise->wait();
            } catch (HttpException $exception) {
                $exceptions->add(ProxyResponseException::proxyResponse($exception));
            } catch (RequestException $exception) {
                $exceptions->add(ProxyUnreachableException::proxyUnreachable($exception));
            } catch (\Exception $exception) {
                // @codeCoverageIgnoreStart
                $exceptions->add(new InvalidArgumentException($exception));
                // @codeCoverageIgnoreEnd
            }
        }

        if (count($exceptions)) {
            throw $exceptions;
        }

        return count($queue);
    }

    /**
     * Get the list of servers to send invalidation requests to.
     *
     * @return UriInterface[]
     */
    protected function getServers()
    {
        return $this->servers;
    }

    /**
     * Duplicate a request for each caching server.
     *
     * @param RequestInterface $request The request to duplicate for each configured server
     *
     * @return RequestInterface[]
     */
    private function fanOut(RequestInterface $request)
    {
        $requests = [];

        $uri = $request->getUri();

        // If a base URI is configured, try to make partial invalidation
        // requests complete.
        if ($this->baseUri) {
            if ($uri->getHost()) {
                // Absolute URI: does it already have a scheme?
                if (!$uri->getScheme() && $this->baseUri->getScheme() !== '') {
                    $uri = $uri->withScheme($this->baseUri->getScheme());
                }
            } else {
                // Relative URI
                if ($this->baseUri->getHost() !== '') {
                    $uri = $uri->withHost($this->baseUri->getHost());
                }

                if ($this->baseUri->getPort()) {
0   == false // true
0   == null  // true
123 == false // false
123 == null  // false

// It is often better to use strict comparison
0 === false // false
0 === null  // false
                    $uri = $uri->withPort($this->baseUri->getPort());
                }

                // Base path
                if ($this->baseUri->getPath() !== '') {
                    $path = $this->baseUri->getPath().'/'.ltrim($uri->getPath(), '/');
                    $uri = $uri->withPath($path);
                }
            }
        }

        // Close connections to make sure invalidation (PURGE/BAN) requests
        // will not interfere with content (GET) requests.
        $request = $request->withUri($uri)->withHeader('Connection', 'Close');

        // Create a request to each caching proxy server
        foreach ($this->getServers() as $server) {
            $requests[] = $request->withUri(
                $uri
                    ->withScheme($server->getScheme())
                    ->withHost($server->getHost())
                    ->withPort($server->getPort()),
                true    // Preserve application Host header
            );
        }

        return $requests;
    }

    /**
     * Set caching proxy server URI objects, validating them.
     *
     * @param string[] $servers Caching proxy proxy server hostnames or IP
     *                          addresses, including port if not port 80.
     *                          E.g. ['127.0.0.1:6081']
     *
     * @throws InvalidUrlException If server is invalid or contains URL
     *                             parts other than scheme, host, port
     */
    private function setServers(array $servers)
    {
        $this->servers = [];
        foreach ($servers as $server) {
            $this->servers[] = $this->filterUri($server, ['scheme', 'host', 'port']);
        }
    }

    /**
     * Set application base URI that will be prefixed to relative purge and
     * refresh requests, and validate it.
     *
     * @param string $uriString Your application’s base URI
     *
     * @throws InvalidUrlException If the base URI is not a valid URI
     */
    private function setBaseUri($uriString = null)
    {
        if (!$uriString) {
''   == false // true
''   == null  // true
'ab' == false // false
'ab' == null  // false

// It is often better to use strict comparison
'' === false // false
'' === null  // false
            $this->baseUri = null;

            return;
        }

        $this->baseUri = $this->filterUri($uriString);
    }

    /**
     * Filter a URL.
     *
     * Prefix the URL with "http://" if it has no scheme, then check the URL
     * for validity. You can specify what parts of the URL are allowed.
     *
     * @param string   $uriString
     * @param string[] $allowedParts Array of allowed URL parts (optional)
     *
     * @return UriInterface Filtered URI (with default scheme if there was no scheme)
     *
     * @throws InvalidUrlException If URL is invalid, the scheme is not http or
     *                             contains parts that are not expected
     */
    private function filterUri($uriString, array $allowedParts = [])
    {
        if (!is_string($uriString)) {
            throw new \InvalidArgumentException(sprintf(
                'URI parameter must be a string, %s given',
                gettype($uriString)
            ));
        }

        // Creating a PSR-7 URI without scheme (with parse_url) results in the
        // original hostname to be seen as path. So first add a scheme if none
        // is given.
        if (false === strpos($uriString, '://')) {
            $uriString = sprintf('%s://%s', 'http', $uriString);
        }

        try {
            $uri = $this->uriFactory->createUri($uriString);
        } catch (\InvalidArgumentException $e) {
            throw InvalidUrlException::invalidUrl($uriString);
        }

        if (!$uri->getScheme()) {
            throw InvalidUrlException::invalidUrl($uriString, 'empty scheme');
        }

        if (count($allowedParts) > 0) {
            $parts = parse_url((string) $uri);
            $diff = array_diff(array_keys($parts), $allowedParts);
            if (count($diff) > 0) {
                throw InvalidUrlException::invalidUrlParts($uriString, $allowedParts);
            }
        }

        return $uri;
    }

    /**
     * Build a request signature based on the request data. Unique for every different request, identical
     * for the same requests.
     *
     * This signature is used to avoid sending the same invalidation request twice.
     *
     * @param RequestInterface $request An invalidation request
     *
     * @return string A signature for this request
     */
    private function getRequestSignature(RequestInterface $request)
    {
        $headers = $request->getHeaders();
        ksort($headers);

        return sha1($request->getMethod()."\n".$request->getUri()."\n".var_export($headers, true));
    }
}


1		<?php
2
3		/*
4		* This file is part of the FOSHttpCache package.
5		*
6		* (c) FriendsOfSymfony <http://friendsofsymfony.github.com/>
7		*
8		* For the full copyright and license information, please view the LICENSE
9		* file that was distributed with this source code.
10		*/
11
12		namespace FOS\HttpCache\ProxyClient;
13
14		use FOS\HttpCache\Exception\ExceptionCollection;
15		use FOS\HttpCache\Exception\InvalidArgumentException;
16		use FOS\HttpCache\Exception\InvalidUrlException;
17		use FOS\HttpCache\Exception\MissingHostException;
18		use FOS\HttpCache\Exception\ProxyResponseException;
19		use FOS\HttpCache\Exception\ProxyUnreachableException;
20		use Http\Client\Common\Plugin\ErrorPlugin;
21		use Http\Client\Common\PluginClient;
22		use Http\Client\Exception\HttpException;
23		use Http\Client\Exception\RequestException;
24		use Http\Client\HttpAsyncClient;
25		use Http\Discovery\HttpAsyncClientDiscovery;
26		use Http\Discovery\UriFactoryDiscovery;
27		use Http\Message\UriFactory;
28		use Http\Promise\Promise;
29		use Psr\Http\Message\RequestInterface;
30		use Psr\Http\Message\UriInterface;
31
32		/**
33		* Queue and send HTTP requests with a Httplug asynchronous client.
34		*
35		* @author David Buchmann <[email protected]>
36		*/
37		class HttpDispatcher
38		{
39		/**
40		* @var HttpAsyncClient
41		*/
42		private $httpClient;
43
44		/**
45		* @var UriFactory
46		*/
47		private $uriFactory;
48
49		/**
50		* Queued requests.
51		*
52		* @var RequestInterface[]
53		*/
54		private $queue = [];
55
56		/**
57		* Caching proxy server host names or IP addresses.
58		*
59		* @var UriInterface[]
60		*/
61		private $servers;
62
63		/**
64		* Application host name and optional base URL.
65		*
66		* @var UriInterface
67		*/
68		private $baseUri;
69
70		/**
71		* If you specify a custom HTTP client, make sure that it converts HTTP
72		* errors to exceptions.
73		*
74		* If your proxy server IPs can not be statically configured, extend this
75		* class and overwrite getServers. Be sure to have some caching in
76		* getServers.
77		*
78		* @param string[] $servers Caching proxy server hostnames or IP
79		* addresses, including port if not port 80.
80		* E.g. ['127.0.0.1:6081']
81		* @param string $baseUri Default application hostname, optionally
82		* including base URL, for purge and refresh
83		* requests (optional). This is required if
84		* you purge and refresh paths instead of
85		* absolute URLs
86		* @param HttpAsyncClient\|null $httpClient Client capable of sending HTTP requests. If no
87		* client is supplied, a default one is created
88		* @param UriFactory\|null $uriFactory Factory for PSR-7 URIs. If not specified, a
89		* default one is created
90		*/
91	38	public function __construct(
92		array $servers,
93		$baseUri = '',
94		HttpAsyncClient $httpClient = null,
95		UriFactory $uriFactory = null
96		) {
97	38	if (!$httpClient) {
98	26	$httpClient = new PluginClient(
99	26	HttpAsyncClientDiscovery::find(),
100	26	[new ErrorPlugin()]
101		);
102		}
103	38	$this->httpClient = $httpClient;
104	38	$this->uriFactory = $uriFactory ?: UriFactoryDiscovery::find();
105
106	38	$this->setServers($servers);
107	35	$this->setBaseUri($baseUri);
108	34	}
109
110		/**
111		* Queue invalidation request.
112		*
113		* @param RequestInterface $invalidationRequest
114		*/
115	33	public function invalidate(RequestInterface $invalidationRequest)
116		{
117	33	if (!$this->baseUri && !$invalidationRequest->getUri()->getHost()) {
118	1	throw MissingHostException::missingHost((string) $invalidationRequest->getUri());
119		}
120
121	32	$signature = $this->getRequestSignature($invalidationRequest);
122
123	32	if (isset($this->queue[$signature])) {
124	1	return;
125		}
126
127	32	$this->queue[$signature] = $invalidationRequest;
128	32	}
129
130		/**
131		* Send all pending invalidation requests and make sure the requests have terminated and gather exceptions.
132		*
133		* @return int The number of cache invalidations performed per caching server
134		*
135		* @throws ExceptionCollection If any errors occurred during flush
136		*/
137	33	public function flush()
138		{
139	33	$queue = $this->queue;
140	33	$this->queue = [];
141		/** @var Promise[] $promises */
142	33	$promises = [];
143
144	33	$exceptions = new ExceptionCollection();
145
146	33	foreach ($queue as $request) {
147	32	foreach ($this->fanOut($request) as $proxyRequest) {
148		try {
149	32	$promises[] = $this->httpClient->sendAsyncRequest($proxyRequest);
150	1	} catch (\Exception $e) {
151	32	$exceptions->add(new InvalidArgumentException($e));
152		}
153		}
154		}
155
156	33	foreach ($promises as $promise) {
157		try {
158	32	$promise->wait();
159	4	} catch (HttpException $exception) {
160	2	$exceptions->add(ProxyResponseException::proxyResponse($exception));
161	2	} catch (RequestException $exception) {
162	2	$exceptions->add(ProxyUnreachableException::proxyUnreachable($exception));
163		} catch (\Exception $exception) {
164		// @codeCoverageIgnoreStart
165		$exceptions->add(new InvalidArgumentException($exception));
166		// @codeCoverageIgnoreEnd
167		}
168		}
169
170	33	if (count($exceptions)) {
171	5	throw $exceptions;
172		}
173
174	31	return count($queue);
175		}
176
177		/**
178		* Get the list of servers to send invalidation requests to.
179		*
180		* @return UriInterface[]
181		*/
182	32	protected function getServers()
183		{
184	32	return $this->servers;
185		}
186
187		/**
188		* Duplicate a request for each caching server.
189		*
190		* @param RequestInterface $request The request to duplicate for each configured server
191		*
192		* @return RequestInterface[]
193		*/
194	32	private function fanOut(RequestInterface $request)
195		{
196	32	$requests = [];
197
198	32	$uri = $request->getUri();
199
200		// If a base URI is configured, try to make partial invalidation
201		// requests complete.
202	32	if ($this->baseUri) {
203	30	if ($uri->getHost()) {
204		// Absolute URI: does it already have a scheme?
205	5	if (!$uri->getScheme() && $this->baseUri->getScheme() !== '') {
206	5	$uri = $uri->withScheme($this->baseUri->getScheme());
207		}
208		} else {
209		// Relative URI
210	25	if ($this->baseUri->getHost() !== '') {
211	25	$uri = $uri->withHost($this->baseUri->getHost());
212		}
213
214	25	if ($this->baseUri->getPort()) {
		0 ignored issues – show Bug Best Practice introduced 2015-12-07 13:45 UTC by Report Bug Copy Issue Report The expression `$this->baseUri->getPort()` of type `null\|integer` is loosely compared to `true`; this is ambiguous if the integer can be zero. You might want to explicitly use `!== null` instead. In PHP, under loose comparison (like `==`, or `!=`, or `switch` conditions), values of different types might be equal. For `integer` values, zero is a special case, in particular the following results might be unexpected: 0 == false // true 0 == null // true 123 == false // false 123 == null // false // It is often better to use strict comparison 0 === false // false 0 === null // false Loading history...
215	16	$uri = $uri->withPort($this->baseUri->getPort());
216		}
217
218		// Base path
219	25	if ($this->baseUri->getPath() !== '') {
220	1	$path = $this->baseUri->getPath().'/'.ltrim($uri->getPath(), '/');
221	1	$uri = $uri->withPath($path);
222		}
223		}
224		}
225
226		// Close connections to make sure invalidation (PURGE/BAN) requests
227		// will not interfere with content (GET) requests.
228	32	$request = $request->withUri($uri)->withHeader('Connection', 'Close');
229
230		// Create a request to each caching proxy server
231	32	foreach ($this->getServers() as $server) {
232	32	$requests[] = $request->withUri(
233		$uri
234	32	->withScheme($server->getScheme())
235	32	->withHost($server->getHost())
236	32	->withPort($server->getPort()),
237	32	true // Preserve application Host header
238		);
239		}
240
241	32	return $requests;
242		}
243
244		/**
245		* Set caching proxy server URI objects, validating them.
246		*
247		* @param string[] $servers Caching proxy proxy server hostnames or IP
248		* addresses, including port if not port 80.
249		* E.g. ['127.0.0.1:6081']
250		*
251		* @throws InvalidUrlException If server is invalid or contains URL
252		* parts other than scheme, host, port
253		*/
254	38	private function setServers(array $servers)
255		{
256	38	$this->servers = [];
257	38	foreach ($servers as $server) {
258	38	$this->servers[] = $this->filterUri($server, ['scheme', 'host', 'port']);
259		}
260	35	}
261
262		/**
263		* Set application base URI that will be prefixed to relative purge and
264		* refresh requests, and validate it.
265		*
266		* @param string $uriString Your application’s base URI
267		*
268		* @throws InvalidUrlException If the base URI is not a valid URI
269		*/
270	35	private function setBaseUri($uriString = null)
271		{
272	35	if (!$uriString) {
		0 ignored issues – show Bug Best Practice introduced 2016-10-07 09:27 UTC by Report Bug Copy Issue Report The expression `$uriString` of type `string\|null` is loosely compared to `false`; this is ambiguous if the string can be empty. You might want to explicitly use `=== null` instead. In PHP, under loose comparison (like `==`, or `!=`, or `switch` conditions), values of different types might be equal. For `string` values, the empty string `''` is a special case, in particular the following results might be unexpected: '' == false // true '' == null // true 'ab' == false // false 'ab' == null // false // It is often better to use strict comparison '' === false // false '' === null // false Loading history...
273	3	$this->baseUri = null;
274
275	3	return;
276		}
277
278	32	$this->baseUri = $this->filterUri($uriString);
279	31	}
280
281		/**
282		* Filter a URL.
283		*
284		* Prefix the URL with "http://" if it has no scheme, then check the URL
285		* for validity. You can specify what parts of the URL are allowed.
286		*
287		* @param string $uriString
288		* @param string[] $allowedParts Array of allowed URL parts (optional)
289		*
290		* @return UriInterface Filtered URI (with default scheme if there was no scheme)
291		*
292		* @throws InvalidUrlException If URL is invalid, the scheme is not http or
293		* contains parts that are not expected
294		*/
295	38	private function filterUri($uriString, array $allowedParts = [])
296		{
297	38	if (!is_string($uriString)) {
298	1	throw new \InvalidArgumentException(sprintf(
299	1	'URI parameter must be a string, %s given',
300		gettype($uriString)
301		));
302		}
303
304		// Creating a PSR-7 URI without scheme (with parse_url) results in the
305		// original hostname to be seen as path. So first add a scheme if none
306		// is given.
307	38	if (false === strpos($uriString, '://')) {
308	34	$uriString = sprintf('%s://%s', 'http', $uriString);
309		}
310
311		try {
312	38	$uri = $this->uriFactory->createUri($uriString);
313	1	} catch (\InvalidArgumentException $e) {
314	1	throw InvalidUrlException::invalidUrl($uriString);
315		}
316
317	37	if (!$uri->getScheme()) {
318	1	throw InvalidUrlException::invalidUrl($uriString, 'empty scheme');
319		}
320
321	36	if (count($allowedParts) > 0) {
322	36	$parts = parse_url((string) $uri);
323	36	$diff = array_diff(array_keys($parts), $allowedParts);
324	36	if (count($diff) > 0) {
325	1	throw InvalidUrlException::invalidUrlParts($uriString, $allowedParts);
326		}
327		}
328
329	35	return $uri;
330		}
331
332		/**
333		* Build a request signature based on the request data. Unique for every different request, identical
334		* for the same requests.
335		*
336		* This signature is used to avoid sending the same invalidation request twice.
337		*
338		* @param RequestInterface $request An invalidation request
339		*
340		* @return string A signature for this request
341		*/
342	32	private function getRequestSignature(RequestInterface $request)
343		{
344	32	$headers = $request->getHeaders();
345	32	ksort($headers);
346
347	32	return sha1($request->getMethod()."\n".$request->getUri()."\n".var_export($headers, true));
348		}
349		}
350

FriendsOfSymfony / FOSHttpCache

Pull Request — master (#353)

HttpDispatcher::flush() D

Complexity

Size

Duplication

Code Coverage

Importance

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