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<?php |
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namespace ZendFirebase\Stream; |
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use GuzzleHttp; |
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use RuntimeException; |
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use phpDocumentor\Reflection\DocBlock\Tags\Generic; |
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/** |
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* PHP7 FIREBASE LIBRARY (http://samuelventimiglia.it/) |
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* |
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* |
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* @link https://github.com/Samuel18/zend_Firebase |
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* @copyright Copyright (c) 2016-now Ventimiglia Samuel - Biasin Davide |
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* @license BSD 3-Clause License |
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* |
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*/ |
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/** |
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* This class create an object of Client |
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* |
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* @author ghostbyte |
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* @package ZendFirebase |
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* @since 2016-10-28 |
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* |
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*/ |
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class StreamClient |
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{ |
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/** |
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* Stream pattern END_OF_MESSAGE |
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* |
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* @var string |
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*/ |
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const END_OF_MESSAGE = "/\r\n\r\n|\n\n|\r\r/"; |
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/** |
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* Client for send request |
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* |
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* @var GuzzleHttp\Client $client |
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*/ |
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private $client; |
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/** |
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* Responce object from rest |
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* |
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* @var GuzzleHttp\Psr7\Response $response |
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*/ |
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private $response; |
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/** |
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* Request url to send request |
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* |
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* @var string $url |
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*/ |
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private $url; |
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/** |
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* Last received message id |
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* |
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* @var string $lastMessageId |
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*/ |
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private $lastMessageId; |
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/** |
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* Reconnection time in milliseconds |
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* |
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* @var integer $retry |
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*/ |
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private $retry = 3000; |
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/** |
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* Constructor |
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* |
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* @param string $url |
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* @param integer $requestDelay |
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* @throws InvaliArgumentException |
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*/ |
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public function __construct($url, $requestDelay) |
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{ |
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$this->url = $url; |
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$this->retry = $requestDelay; |
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if (empty($this->url)) { |
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throw new \InvalidArgumentException('Error: url empty...'); |
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} |
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$this->createClientObject(); |
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$this->connect(); |
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} |
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/** |
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* Create client |
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*/ |
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private function createClientObject() |
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{ |
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$this->client = new GuzzleHttp\Client([ |
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'headers' => [ |
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'Accept' => 'text/event-stream', |
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'Cache-Control' => 'no-cache', |
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'allow_redirects' => true |
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] |
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]); |
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$this->connect(); |
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} |
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/** |
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* |
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* @return string $lastMessageId |
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*/ |
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public function getLastMessageId(): string |
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{ |
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return $this->lastMessageId; |
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} |
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/** |
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* |
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* @param string $lastMessageId |
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*/ |
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public function setLastMessageId($lastMessageId) |
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{ |
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$this->lastMessageId = $lastMessageId; |
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} |
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/** |
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* Connect to firebase server |
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* |
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* @throws RuntimeException |
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*/ |
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private function connect() |
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{ |
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$this->sendRequest(); |
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if ($this->response->getStatusCode() == 204) { |
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throw new RuntimeException('Error: Server forbid connection retry by responding 204 status code.'); |
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} |
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} |
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/** |
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* Send Request |
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*/ |
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private function sendRequest() |
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{ |
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$headers = []; |
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if ($this->lastMessageId) { |
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$headers['Last-Event-ID'] = $this->lastMessageId; |
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} |
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$this->response = $this->client->request('GET', $this->url, [ |
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'stream' => true, |
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'headers' => $headers |
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]); |
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} |
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/** |
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* Returns generator that yields new event when it's available on stream. |
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*/ |
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public function getEvents() |
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{ |
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/* initialize empty buffer */ |
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$buffer = ''; |
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/* bring body of response */ |
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$body = $this->response->getBody(); |
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/* infinte loop */ |
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while (true) { |
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/* if server close connection - try to reconnect */ |
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if ($body->eof()) { |
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/* wait retry period before reconnection */ |
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sleep($this->retry / 1000); |
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/* reconnect */ |
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$this->connect(); |
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/* clear buffer since there is no sense in partial message */ |
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$buffer = ''; |
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} |
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/* start read into stream */ |
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$buffer .= $body->read(1); |
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if (preg_match(self::END_OF_MESSAGE, $buffer)) { |
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$parts = preg_split(self::END_OF_MESSAGE, $buffer, 2); |
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$rawMessage = $parts[0]; |
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$remaining = $parts[1]; |
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$buffer = $remaining; |
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/** |
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* Save event into StreamEvent |
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* |
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* @var StreamEvent $event |
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*/ |
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$event = StreamEvent::parse($rawMessage); |
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yield $event; |
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} |
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} |
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} |
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} |
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|
Samuel18 /
zend_Firebase
