HttpDispatcher::setServers() - Code Metrics - Inspection of "Make MultiplexerClient implement TagCapable" - FriendsOfSymfony/FOSHttpCache - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#342)

by David de

created 2017-02-01 07:47 UTC

HttpDispatcher::setServers() A

↳ Parent: HttpDispatcher

Complexity

Conditions	2
Paths	2

Size

Total Lines	7
Code Lines	4

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	5
CRAP Score	2

Importance

Changes

Metric	Value
dl	0
loc	7
ccs	5
cts	5
cp	1
rs	9.4285
c	0
b	0
f	0
cc	2
eloc	4
nc	2
nop	1
crap	2

<?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.
     *
     * @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);
    }

    /**
     * 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->servers 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		* @param string[] $servers Caching proxy server hostnames or IP
75		* addresses, including port if not port 80.
76		* E.g. ['127.0.0.1:6081']
77		* @param string $baseUri Default application hostname, optionally
78		* including base URL, for purge and refresh
79		* requests (optional). This is required if
80		* you purge and refresh paths instead of
81		* absolute URLs
82		* @param HttpAsyncClient\|null $httpClient Client capable of sending HTTP requests. If no
83		* client is supplied, a default one is created
84		* @param UriFactory\|null $uriFactory Factory for PSR-7 URIs. If not specified, a
85		* default one is created
86		*/
87	39	public function __construct(
88		array $servers,
89		$baseUri = '',
90		HttpAsyncClient $httpClient = null,
91		UriFactory $uriFactory = null
92		) {
93	39	if (!$httpClient) {
94	27	$httpClient = new PluginClient(
95	27	HttpAsyncClientDiscovery::find(),
96	27	[new ErrorPlugin()]
97		);
98		}
99	39	$this->httpClient = $httpClient;
100	39	$this->uriFactory = $uriFactory ?: UriFactoryDiscovery::find();
101
102	39	$this->setServers($servers);
103	36	$this->setBaseUri($baseUri);
104	35	}
105
106		/**
107		* Queue invalidation request.
108		*
109		* @param RequestInterface $invalidationRequest
110		*/
111	33	public function invalidate(RequestInterface $invalidationRequest)
112		{
113	33	if (!$this->baseUri && !$invalidationRequest->getUri()->getHost()) {
114	1	throw MissingHostException::missingHost((string) $invalidationRequest->getUri());
115		}
116
117	32	$signature = $this->getRequestSignature($invalidationRequest);
118
119	32	if (isset($this->queue[$signature])) {
120	1	return;
121		}
122
123	32	$this->queue[$signature] = $invalidationRequest;
124	32	}
125
126		/**
127		* Send all pending invalidation requests and make sure the requests have terminated and gather exceptions.
128		*
129		* @return int The number of cache invalidations performed per caching server
130		*
131		* @throws ExceptionCollection If any errors occurred during flush
132		*/
133	33	public function flush()
134		{
135	33	$queue = $this->queue;
136	33	$this->queue = [];
137		/** @var Promise[] $promises */
138	33	$promises = [];
139
140	33	$exceptions = new ExceptionCollection();
141
142	33	foreach ($queue as $request) {
143	32	foreach ($this->fanOut($request) as $proxyRequest) {
144		try {
145	32	$promises[] = $this->httpClient->sendAsyncRequest($proxyRequest);
146	1	} catch (\Exception $e) {
147	32	$exceptions->add(new InvalidArgumentException($e));
148		}
149		}
150		}
151
152	33	foreach ($promises as $promise) {
153		try {
154	32	$promise->wait();
155	4	} catch (HttpException $exception) {
156	2	$exceptions->add(ProxyResponseException::proxyResponse($exception));
157	2	} catch (RequestException $exception) {
158	2	$exceptions->add(ProxyUnreachableException::proxyUnreachable($exception));
159		} catch (\Exception $exception) {
160		// @codeCoverageIgnoreStart
161		$exceptions->add(new InvalidArgumentException($exception));
162		// @codeCoverageIgnoreEnd
163		}
164		}
165
166	33	if (count($exceptions)) {
167	5	throw $exceptions;
168		}
169
170	31	return count($queue);
171		}
172
173		/**
174		* Duplicate a request for each caching server.
175		*
176		* @param RequestInterface $request The request to duplicate for each configured server
177		*
178		* @return RequestInterface[]
179		*/
180	32	private function fanOut(RequestInterface $request)
181		{
182	32	$requests = [];
183
184	32	$uri = $request->getUri();
185
186		// If a base URI is configured, try to make partial invalidation
187		// requests complete.
188	32	if ($this->baseUri) {
189	30	if ($uri->getHost()) {
190		// Absolute URI: does it already have a scheme?
191	5	if (!$uri->getScheme() && $this->baseUri->getScheme() !== '') {
192	5	$uri = $uri->withScheme($this->baseUri->getScheme());
193		}
194		} else {
195		// Relative URI
196	25	if ($this->baseUri->getHost() !== '') {
197	25	$uri = $uri->withHost($this->baseUri->getHost());
198		}
199
200	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...
201	16	$uri = $uri->withPort($this->baseUri->getPort());
202		}
203
204		// Base path
205	25	if ($this->baseUri->getPath() !== '') {
206	1	$path = $this->baseUri->getPath().'/'.ltrim($uri->getPath(), '/');
207	1	$uri = $uri->withPath($path);
208		}
209		}
210		}
211
212		// Close connections to make sure invalidation (PURGE/BAN) requests
213		// will not interfere with content (GET) requests.
214	32	$request = $request->withUri($uri)->withHeader('Connection', 'Close');
215
216		// Create a request to each caching proxy server
217	32	foreach ($this->servers as $server) {
218	32	$requests[] = $request->withUri(
219		$uri
220	32	->withScheme($server->getScheme())
221	32	->withHost($server->getHost())
222	32	->withPort($server->getPort()),
223	32	true // Preserve application Host header
224		);
225		}
226
227	32	return $requests;
228		}
229
230		/**
231		* Set caching proxy server URI objects, validating them.
232		*
233		* @param string[] $servers Caching proxy proxy server hostnames or IP
234		* addresses, including port if not port 80.
235		* E.g. ['127.0.0.1:6081']
236		*
237		* @throws InvalidUrlException If server is invalid or contains URL
238		* parts other than scheme, host, port
239		*/
240	39	private function setServers(array $servers)
241		{
242	39	$this->servers = [];
243	39	foreach ($servers as $server) {
244	39	$this->servers[] = $this->filterUri($server, ['scheme', 'host', 'port']);
245		}
246	36	}
247
248		/**
249		* Set application base URI that will be prefixed to relative purge and
250		* refresh requests, and validate it.
251		*
252		* @param string $uriString Your application’s base URI
253		*
254		* @throws InvalidUrlException If the base URI is not a valid URI
255		*/
256	36	private function setBaseUri($uriString = null)
257		{
258	36	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...
259	3	$this->baseUri = null;
260
261	3	return;
262		}
263
264	33	$this->baseUri = $this->filterUri($uriString);
265	32	}
266
267		/**
268		* Filter a URL.
269		*
270		* Prefix the URL with "http://" if it has no scheme, then check the URL
271		* for validity. You can specify what parts of the URL are allowed.
272		*
273		* @param string $uriString
274		* @param string[] $allowedParts Array of allowed URL parts (optional)
275		*
276		* @return UriInterface Filtered URI (with default scheme if there was no scheme)
277		*
278		* @throws InvalidUrlException If URL is invalid, the scheme is not http or
279		* contains parts that are not expected
280		*/
281	39	private function filterUri($uriString, array $allowedParts = [])
282		{
283	39	if (!is_string($uriString)) {
284	1	throw new \InvalidArgumentException(sprintf(
285	1	'URI parameter must be a string, %s given',
286		gettype($uriString)
287		));
288		}
289
290		// Creating a PSR-7 URI without scheme (with parse_url) results in the
291		// original hostname to be seen as path. So first add a scheme if none
292		// is given.
293	39	if (false === strpos($uriString, '://')) {
294	35	$uriString = sprintf('%s://%s', 'http', $uriString);
295		}
296
297		try {
298	39	$uri = $this->uriFactory->createUri($uriString);
299	1	} catch (\InvalidArgumentException $e) {
300	1	throw InvalidUrlException::invalidUrl($uriString);
301		}
302
303	38	if (!$uri->getScheme()) {
304	1	throw InvalidUrlException::invalidUrl($uriString, 'empty scheme');
305		}
306
307	37	if (count($allowedParts) > 0) {
308	37	$parts = parse_url((string) $uri);
309	37	$diff = array_diff(array_keys($parts), $allowedParts);
310	37	if (count($diff) > 0) {
311	1	throw InvalidUrlException::invalidUrlParts($uriString, $allowedParts);
312		}
313		}
314
315	36	return $uri;
316		}
317
318		/**
319		* Build a request signature based on the request data. Unique for every different request, identical
320		* for the same requests.
321		*
322		* This signature is used to avoid sending the same invalidation request twice.
323		*
324		* @param RequestInterface $request An invalidation request
325		*
326		* @return string A signature for this request
327		*/
328	32	private function getRequestSignature(RequestInterface $request)
329		{
330	32	$headers = $request->getHeaders();
331	32	ksort($headers);
332
333	32	return sha1($request->getMethod()."\n".$request->getUri()."\n".var_export($headers, true));
334		}
335		}
336

FriendsOfSymfony / FOSHttpCache

Pull Request — master (#342)

HttpDispatcher::setServers() A

Complexity

Size

Duplication

Code Coverage

Importance

Duplication Side-by-Side

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