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<?php |
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namespace h4kuna\Fio\Request; |
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use GuzzleHttp, |
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h4kuna\Fio, |
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h4kuna\Fio\Response\Pay, |
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Nette\Utils; |
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class Queue implements IQueue |
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{ |
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/** @var string[] */ |
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private static $tokens = []; |
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/** @var int */ |
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private $limitLoop = 5; |
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/** @var bool */ |
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private $sleep = true; |
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/** @var array */ |
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private $downloadOptions = []; |
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/** @var string */ |
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private $tempDir; |
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public function __construct($tempDir) |
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{ |
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$this->tempDir = $tempDir; |
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} |
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/** |
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* @param int $limitLoop |
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*/ |
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public function setLimitLoop($limitLoop) |
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{ |
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$this->limitLoop = (int) $limitLoop; |
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} |
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/** |
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* @param array|\Iterator $downloadOptions |
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*/ |
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public function setDownloadOptions($downloadOptions) |
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{ |
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foreach ($downloadOptions as $define => $value) { |
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if (is_string($define) && defined($define)) { |
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$define = constant($define); |
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} |
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$this->downloadOptions[$define] = $value; |
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} |
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} |
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public function setSleep($sleep) |
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{ |
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$this->sleep = (bool) $sleep; |
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} |
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/** |
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* @param $token |
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* @param string $url |
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* @return mixed|string |
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* @throws Fio\QueueLimitException |
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* @throws Fio\ServiceUnavailableException |
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*/ |
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public function download($token, $url) |
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{ |
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return $this->request($token, function (GuzzleHttp\Client $client) use ($url) { |
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return $client->request('GET', $url, $this->downloadOptions); |
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}, 'download'); |
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} |
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/** |
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* @return Pay\IResponse |
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* @throws Fio\QueueLimitException |
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* @throws Fio\ServiceUnavailableException |
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*/ |
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public function upload($url, $token, array $post, $filename) |
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{ |
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$newPost = []; |
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foreach ($post as $name => $value) { |
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$newPost[] = ['name' => $name, 'contents' => $value]; |
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} |
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$newPost[] = ['name' => 'file', 'contents' => fopen($filename, 'r')]; |
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$response = $this->request($token, function (GuzzleHttp\Client $client) use ($url, $newPost) { |
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return $client->request('POST', $url, [GuzzleHttp\RequestOptions::MULTIPART => $newPost]); |
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}, 'upload'); |
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return self::createXmlResponse($response); |
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} |
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/** |
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* @param $token |
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* @param $fallback |
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* @param string $action |
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* @return GuzzleHttp\Psr7\Stream |
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* @throws Fio\QueueLimitException |
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* @throws Fio\ServiceUnavailableException |
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*/ |
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private function request($token, $fallback, $action) |
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{ |
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$request = new GuzzleHttp\Client(['headers' => ['X-Powered-By' => 'h4kuna/fio']]); |
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$tempFile = $this->loadFileName($token); |
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$file = fopen(self::safeProtocol($tempFile), 'w'); |
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$i = 0; |
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do { |
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$next = false; |
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++$i; |
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try { |
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$response = $fallback($request); |
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} catch (GuzzleHttp\Exception\ClientException $e) { |
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if ($e->getCode() !== self::HEADER_CONFLICT || !$this->sleep) { |
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fclose($file); |
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throw $e; |
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} elseif ($i >= $this->limitLoop) { |
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fclose($file); |
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throw new Fio\QueueLimitException('You have limit up requests to server ' . $this->limitLoop); |
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} |
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self::sleep($tempFile); |
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$next = true; |
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} catch (GuzzleHttp\Exception\ServerException $e) { |
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if($e->hasResponse()) { |
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self::detectDownloadResponse( $e->getResponse() ); |
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} |
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throw new Fio\ServiceUnavailableException('Service is currently unavailable'); |
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} catch (GuzzleHttp\Exception\ConnectException $e) { |
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throw new Fio\ServiceUnavailableException('Service is currently unavailable'); |
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} |
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} while ($next); |
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fclose($file); |
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touch($tempFile); |
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if ($action === 'download') { |
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self::detectDownloadResponse($response); |
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} |
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return $response->getBody(); |
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} |
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/** |
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* @param $response |
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* @throws Fio\ServiceUnavailableException |
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*/ |
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private static function detectDownloadResponse($response) |
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{ |
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/* @var $contentTypeHeaders array */ |
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$contentTypeHeaders = $response->getHeader('Content-Type'); |
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$contentType = array_shift($contentTypeHeaders); |
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if ($contentType === 'text/xml;charset=UTF-8') { |
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$xmlResponse = self::createXmlResponse($response); |
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if ($xmlResponse->getErrorCode() !== 0) { |
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throw new Fio\ServiceUnavailableException($xmlResponse->getError(), $xmlResponse->getErrorCode()); |
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} |
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} |
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} |
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private static function sleep($filename) |
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{ |
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$criticalTime = time() - filemtime($filename); |
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if ($criticalTime < self::WAIT_TIME) { |
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sleep(self::WAIT_TIME - $criticalTime); |
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} |
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} |
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/** |
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* @param string $token |
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* @return string |
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*/ |
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private function loadFileName($token) |
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{ |
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$key = substr($token, 10, -10); |
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if (!isset(self::$tokens[$key])) { |
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self::$tokens[$key] = $this->tempDir . DIRECTORY_SEPARATOR . md5($key); |
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} |
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return self::$tokens[$key]; |
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} |
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private static function safeProtocol($filename) |
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{ |
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return Utils\SafeStream::PROTOCOL . '://' . $filename; |
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} |
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/** |
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* @param GuzzleHttp\Psr7\Response $response |
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* @return Pay\XMLResponse |
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*/ |
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private static function createXmlResponse($response) |
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{ |
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return new Pay\XMLResponse($response->getBody()->getContents()); |
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} |
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} |
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If you return a value from a function or method, it should be a sub-type of the type that is given by the parent type f.e. an interface, or abstract method. This is more formally defined by the Lizkov substitution principle, and guarantees that classes that depend on the parent type can use any instance of a child type interchangably. This principle also belongs to the SOLID principles for object oriented design.
Let’s take a look at an example:
Our function
my_function
expects aPost
object, and outputs the author of the post. The base classPost
returns a simple string and outputting a simple string will work just fine. However, the child classBlogPost
which is a sub-type ofPost
instead decided to return anobject
, and is therefore violating the SOLID principles. If aBlogPost
were passed tomy_function
, PHP would not complain, but ultimately fail when executing thestrtoupper
call in its body.