AbstractCoreApiClient::unserializeResponse()

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Pull Request — master (#47)

unknown

created 2018-01-10 11:40 UTC

↳ Parent: AbstractCoreApiClient

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<?php

namespace MovingImage\Client\VMPro\ApiClient;

use Cache\Adapter\Void\VoidCachePool;
use GuzzleHttp\ClientInterface;
use JMS\Serializer\Serializer;
use MovingImage\Client\VMPro\Exception;
use MovingImage\Client\VMPro\Interfaces\StopwatchInterface;
use MovingImage\Client\VMPro\Stopwatch\NullStopwatch;
use MovingImage\Client\VMPro\Util\Logging\Traits\LoggerAwareTrait;
use Psr\Cache\CacheItemPoolInterface;
use Psr\Http\Message\ResponseInterface;
use Psr\Log\LoggerAwareInterface;

/**
 * Class AbstractCoreApiClient.
 *
 * @author Ruben Knol <[email protected]>
 */
abstract class AbstractCoreApiClient implements LoggerAwareInterface
{
    use LoggerAwareTrait;

    /**
     * @const string
     */
    const OPT_VIDEO_MANAGER_ID = 'videoManagerId';

    /**
     * List of endpoints that may be cached, even though they use POST.
     */
    const CACHEABLE_POST_ENDPOINTS = ['search'];

    /**
     * @var ClientInterface The Guzzle HTTP client
     */
    protected $httpClient;

    /**
     * @var Serializer The JMS Serializer instance
     */
    protected $serializer;

    /**
     * @var CacheItemPoolInterface PSR6 cache pool implementation
     */
    protected $cacheItemPool;

    /**
     * @var mixed time-to-live for cached responses
     *            The type of this property might be integer, \DateInterval or null
     *
     * @see CacheItemInterface::expiresAfter()
     */
    protected $cacheTtl;

    /**
     * @var StopwatchInterface
     */
    protected $stopwatch;

    /**
     * ApiClient constructor.
     *
     * @param ClientInterface        $httpClient
     * @param Serializer             $serializer
     * @param CacheItemPoolInterface $cacheItemPool
     * @param int                    $cacheTtl
     * @param StopwatchInterface     $stopwatch
     */
    public function __construct(
        ClientInterface $httpClient,
        Serializer $serializer,
        CacheItemPoolInterface $cacheItemPool = null,
        $cacheTtl = null,
        StopwatchInterface $stopwatch = null
    ) {
        $this->httpClient = $httpClient;
        $this->serializer = $serializer;
        $this->cacheItemPool = $cacheItemPool ?: new VoidCachePool();
        $this->cacheTtl = $cacheTtl;
        $this->stopwatch = $stopwatch ?: new NullStopwatch();
    }

    /**
     * @param CacheItemPoolInterface $cacheItemPool
     */
    public function setCacheItemPool(CacheItemPoolInterface $cacheItemPool)
    {
        $this->cacheItemPool = $cacheItemPool;
    }

    public function disableCaching()
    {
        $this->setCacheItemPool(new VoidCachePool());
    }

    /**
     * @return CacheItemPoolInterface
     */
    public function getCacheItemPool()
    {
        return $this->cacheItemPool;
    }

    /**
     * Perform the actual request in the implementation classes.
     *
     * @param string $method
     * @param string $uri
     * @param array  $options
     *
     * @return mixed
     */
    abstract protected function _doRequest($method, $uri, $options);

    /**
     * Make a request to the API and serialize the result according to our
     * serialization strategy.
     *
     * @param string $method
     * @param string $uri
     * @param array  $options
     *
     * @return object|ResponseInterface
     */
    protected function makeRequest($method, $uri, $options)
    {
        $logger = $this->getLogger();

        try {
            // Automagically pre-pend videoManagerId if the option is present in the
            // options for sending the request
            if (isset($options[self::OPT_VIDEO_MANAGER_ID])) {
                $uri = sprintf('%d/%s', $options[self::OPT_VIDEO_MANAGER_ID], $uri);
            }

            $cacheKey = $this->generateCacheKey($method, $uri, $options);
            $cacheItem = $this->cacheItemPool->getItem($cacheKey);
            if ($cacheItem->isHit()) {
                $logger->info(sprintf('Getting response from cache for %s request to %s', $method, $uri), [$uri]);

                return $this->unserializeResponse($cacheItem->get());
            }

            $logger->info(sprintf('Making API %s request to %s', $method, $uri), [$uri]);

            $stopwatchEvent = "$method-$uri";
            $this->stopwatch->start($stopwatchEvent);
            /** @var ResponseInterface $response */
            $response = $this->_doRequest($method, $uri, $options);
            $this->stopwatch->stop($stopwatchEvent);

            if ($this->isCacheable($method, $uri, $options, $response)) {
                $cacheItem->set($this->serializeResponse($response));
                $cacheItem->expiresAfter($this->cacheTtl);
                $this->cacheItemPool->save($cacheItem);
            }

            $logger->debug('Response from HTTP call was status code:', [$response->getStatusCode()]);
            $logger->debug('Response JSON was:', [$response->getBody()]);

            return $response;
        } catch (\Exception $e) {
            throw $e; // Just rethrow for now
        }
    }

    /**
     * Deserialize a response into an instance of it's associated class.
     *
     * @param string $data
     * @param string $serialisationClass
     *
     * @return object
     */
    protected function deserialize($data, $serialisationClass)
    {
        return $this->serializer->deserialize($data, $serialisationClass, 'json');
    }

    /**
     * Helper method to build the JSON data array for making a request
     * with ::makeRequest(). Optional parameters with empty or null value will be
     * omitted from the return value.
     *
     * Examples:
     *
     * $this->buildJsonParameters(['title' => 'test'], ['description' => '', 'bla' => 'test'])
     *
     * Would result in:
     *
     * [
     *     'title' => 'test',
     *     'bla' => 'test',
     * ]
     *
     * @param array $required
     * @param array $optional
     *
     * @return array
     */
    protected function buildJsonParameters(array $required, array $optional)
    {
        foreach ($required as $key => $value) {
            if (empty($value)) {
                throw new Exception(sprintf('Required parameter \'%s\' is missing..', $key));
            }
        }

        $json = $required;

        foreach ($optional as $key => $value) {
            if (!empty($value) || false === $value) {
                $json[$key] = $value;
            }
        }

        return $json;
    }

    /**
     * Generates the cache key based on the class name, request method, uri and options.
     *
     * @param string $method
     * @param string $uri
     * @param array  $options
     *
     * @return string
     */
    private function generateCacheKey($method, $uri, array $options = [])
    {
        return sha1(sprintf('%s.%s.%s.%s', get_class($this), $method, $uri, json_encode($options)));
    }

    /**
     * Checks if the request may be cached.
     *
     * @param string $method
     * @param string $uri
     * @param array  $options
     * @param mixed  $response
     *
     * @return bool
     */
    private function isCacheable($method, $uri, array $options, $response)

    {
        /** @var ResponseInterface $statusCode */
        $statusCode = $response->getStatusCode();

        //cache only 2** responses
        if ($statusCode < 200 || $statusCode >= 300) {
            return false;
        }

        //GET is always safe to cache
        if ('GET' === $method) {
            return true;
        }

        //POST may be cached for certain endpoints only (forgive us Roy Fielding)
        if ('POST' === $method) {
            return in_array($uri, self::CACHEABLE_POST_ENDPOINTS);
        }

        //assume not cacheable in all other cases
        return false;
    }

    /**
     * Serializes the provided response to a string, suitable for caching.
     * The type of the $response argument varies depending on the guzzle version.
     *
     * @param mixed $response
     *
     * @return string
     */
    abstract protected function serializeResponse($response);

    /**
     * Unserializes the serialized response into a response object.
     * The return type varies depending on the guzzle version.
     *
     * @param string $serialized
     *
     * @return mixed
     *
     * @throws Exception
     */
    abstract protected function unserializeResponse($serialized);
}


1			<?php
2
3			namespace MovingImage\Client\VMPro\ApiClient;
4
5			use Cache\Adapter\Void\VoidCachePool;
6			use GuzzleHttp\ClientInterface;
7			use JMS\Serializer\Serializer;
8			use MovingImage\Client\VMPro\Exception;
9			use MovingImage\Client\VMPro\Interfaces\StopwatchInterface;
10			use MovingImage\Client\VMPro\Stopwatch\NullStopwatch;
11			use MovingImage\Client\VMPro\Util\Logging\Traits\LoggerAwareTrait;
12			use Psr\Cache\CacheItemPoolInterface;
13			use Psr\Http\Message\ResponseInterface;
14			use Psr\Log\LoggerAwareInterface;
15
16			/**
17			* Class AbstractCoreApiClient.
18			*
19			* @author Ruben Knol <[email protected]>
20			*/
21			abstract class AbstractCoreApiClient implements LoggerAwareInterface
22			{
23			use LoggerAwareTrait;
24
25			/**
26			* @const string
27			*/
28			const OPT_VIDEO_MANAGER_ID = 'videoManagerId';
29
30			/**
31			* List of endpoints that may be cached, even though they use POST.
32			*/
33			const CACHEABLE_POST_ENDPOINTS = ['search'];
34
35			/**
36			* @var ClientInterface The Guzzle HTTP client
37			*/
38			protected $httpClient;
39
40			/**
41			* @var Serializer The JMS Serializer instance
42			*/
43			protected $serializer;
44
45			/**
46			* @var CacheItemPoolInterface PSR6 cache pool implementation
47			*/
48			protected $cacheItemPool;
49
50			/**
51			* @var mixed time-to-live for cached responses
52			* The type of this property might be integer, \DateInterval or null
53			*
54			* @see CacheItemInterface::expiresAfter()
55			*/
56			protected $cacheTtl;
57
58			/**
59			* @var StopwatchInterface
60			*/
61			protected $stopwatch;
62
63			/**
64			* ApiClient constructor.
65			*
66			* @param ClientInterface $httpClient
67			* @param Serializer $serializer
68			* @param CacheItemPoolInterface $cacheItemPool
69			* @param int $cacheTtl
70			* @param StopwatchInterface $stopwatch
71			*/
72			public function __construct(
73			ClientInterface $httpClient,
74			Serializer $serializer,
75			CacheItemPoolInterface $cacheItemPool = null,
76			$cacheTtl = null,
77			StopwatchInterface $stopwatch = null
78			) {
79			$this->httpClient = $httpClient;
80			$this->serializer = $serializer;
81			$this->cacheItemPool = $cacheItemPool ?: new VoidCachePool();
82			$this->cacheTtl = $cacheTtl;
83			$this->stopwatch = $stopwatch ?: new NullStopwatch();
84			}
85
86			/**
87			* @param CacheItemPoolInterface $cacheItemPool
88			*/
89			public function setCacheItemPool(CacheItemPoolInterface $cacheItemPool)
90			{
91			$this->cacheItemPool = $cacheItemPool;
92			}
93
94			public function disableCaching()
95			{
96			$this->setCacheItemPool(new VoidCachePool());
97			}
98
99			/**
100			* @return CacheItemPoolInterface
101			*/
102			public function getCacheItemPool()
103			{
104			return $this->cacheItemPool;
105			}
106
107			/**
108			* Perform the actual request in the implementation classes.
109			*
110			* @param string $method
111			* @param string $uri
112			* @param array $options
113			*
114			* @return mixed
115			*/
116			abstract protected function _doRequest($method, $uri, $options);
117
118			/**
119			* Make a request to the API and serialize the result according to our
120			* serialization strategy.
121			*
122			* @param string $method
123			* @param string $uri
124			* @param array $options
125			*
126			* @return object\|ResponseInterface
127			*/
128			protected function makeRequest($method, $uri, $options)
129			{
130			$logger = $this->getLogger();
131
132			try {
133			// Automagically pre-pend videoManagerId if the option is present in the
134			// options for sending the request
135			if (isset($options[self::OPT_VIDEO_MANAGER_ID])) {
136			$uri = sprintf('%d/%s', $options[self::OPT_VIDEO_MANAGER_ID], $uri);
137			}
138
139			$cacheKey = $this->generateCacheKey($method, $uri, $options);
140			$cacheItem = $this->cacheItemPool->getItem($cacheKey);
141			if ($cacheItem->isHit()) {
142			$logger->info(sprintf('Getting response from cache for %s request to %s', $method, $uri), [$uri]);
143
144			return $this->unserializeResponse($cacheItem->get());
145			}
146
147			$logger->info(sprintf('Making API %s request to %s', $method, $uri), [$uri]);
148
149			$stopwatchEvent = "$method-$uri";
150			$this->stopwatch->start($stopwatchEvent);
151			/** @var ResponseInterface $response */
152			$response = $this->_doRequest($method, $uri, $options);
153			$this->stopwatch->stop($stopwatchEvent);
154
155			if ($this->isCacheable($method, $uri, $options, $response)) {
156			$cacheItem->set($this->serializeResponse($response));
157			$cacheItem->expiresAfter($this->cacheTtl);
158			$this->cacheItemPool->save($cacheItem);
159			}
160
161			$logger->debug('Response from HTTP call was status code:', [$response->getStatusCode()]);
162			$logger->debug('Response JSON was:', [$response->getBody()]);
163
164			return $response;
165			} catch (\Exception $e) {
166			throw $e; // Just rethrow for now
167			}
168			}
169
170			/**
171			* Deserialize a response into an instance of it's associated class.
172			*
173			* @param string $data
174			* @param string $serialisationClass
175			*
176			* @return object
177			*/
178			protected function deserialize($data, $serialisationClass)
179			{
180			return $this->serializer->deserialize($data, $serialisationClass, 'json');
181			}
182
183			/**
184			* Helper method to build the JSON data array for making a request
185			* with ::makeRequest(). Optional parameters with empty or null value will be
186			* omitted from the return value.
187			*
188			* Examples:
189			*
190			* $this->buildJsonParameters(['title' => 'test'], ['description' => '', 'bla' => 'test'])
191			*
192			* Would result in:
193			*
194			* [
195			* 'title' => 'test',
196			* 'bla' => 'test',
197			* ]
198			*
199			* @param array $required
200			* @param array $optional
201			*
202			* @return array
203			*/
204			protected function buildJsonParameters(array $required, array $optional)
205			{
206			foreach ($required as $key => $value) {
207			if (empty($value)) {
208			throw new Exception(sprintf('Required parameter \'%s\' is missing..', $key));
209			}
210			}
211
212			$json = $required;
213
214			foreach ($optional as $key => $value) {
215			if (!empty($value) \|\| false === $value) {
216			$json[$key] = $value;
217			}
218			}
219
220			return $json;
221			}
222
223			/**
224			* Generates the cache key based on the class name, request method, uri and options.
225			*
226			* @param string $method
227			* @param string $uri
228			* @param array $options
229			*
230			* @return string
231			*/
232			private function generateCacheKey($method, $uri, array $options = [])
233			{
234			return sha1(sprintf('%s.%s.%s.%s', get_class($this), $method, $uri, json_encode($options)));
235			}
236
237			/**
238			* Checks if the request may be cached.
239			*
240			* @param string $method
241			* @param string $uri
242			* @param array $options
243			* @param mixed $response
244			*
245			* @return bool
246			*/
247			private function isCacheable($method, $uri, array $options, $response)
			0 ignored issues – show Unused Code introduced 2017-09-06 16:10 UTC by Report Bug Copy Issue Report The parameter `$options` 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...
248			{
249			/** @var ResponseInterface $statusCode */
250			$statusCode = $response->getStatusCode();
251
252			//cache only 2** responses
253			if ($statusCode < 200 \|\| $statusCode >= 300) {
254			return false;
255			}
256
257			//GET is always safe to cache
258			if ('GET' === $method) {
259			return true;
260			}
261
262			//POST may be cached for certain endpoints only (forgive us Roy Fielding)
263			if ('POST' === $method) {
264			return in_array($uri, self::CACHEABLE_POST_ENDPOINTS);
265			}
266
267			//assume not cacheable in all other cases
268			return false;
269			}
270
271			/**
272			* Serializes the provided response to a string, suitable for caching.
273			* The type of the $response argument varies depending on the guzzle version.
274			*
275			* @param mixed $response
276			*
277			* @return string
278			*/
279			abstract protected function serializeResponse($response);
280
281			/**
282			* Unserializes the serialized response into a response object.
283			* The return type varies depending on the guzzle version.
284			*
285			* @param string $serialized
286			*
287			* @return mixed
288			*
289			* @throws Exception
290			*/
291			abstract protected function unserializeResponse($serialized);
292			}
293

MovingImage24 / VMProApiClient

Pull Request — master (#47)

AbstractCoreApiClient::unserializeResponse()

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