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<?php |
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namespace seregazhuk\React\Memcached; |
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use Evenement\EventEmitter; |
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use React\Promise\Promise; |
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use React\Promise\PromiseInterface; |
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use seregazhuk\React\Memcached\Exception\ConnectionClosedException; |
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use seregazhuk\React\Memcached\Exception\Exception; |
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use seregazhuk\React\Memcached\Exception\FailedCommandException; |
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use seregazhuk\React\Memcached\Exception\WrongCommandException; |
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use seregazhuk\React\Memcached\Protocol\Parser; |
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/** |
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* @method PromiseInterface set(string $key, mixed $value, int $flag = 0, int $exp = 0) |
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* @method PromiseInterface version() |
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* @method PromiseInterface verbosity(int $level) |
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* @method PromiseInterface flushAll() |
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* @method PromiseInterface get($key) |
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* @method PromiseInterface delete($key) |
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* @method PromiseInterface replace($key, $value) |
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* @method PromiseInterface incr($key, $value) |
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* @method PromiseInterface decr($key, $value) |
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* @method PromiseInterface stats() |
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* @method PromiseInterface touch($key, $exp) |
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* @method PromiseInterface add($key, $value) |
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*/ |
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class Client extends EventEmitter |
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{ |
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/** |
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* @var Parser |
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*/ |
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protected $parser; |
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/** |
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* @var Request[] |
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*/ |
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protected $requests = []; |
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/** |
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* Indicates that the connection is closed. |
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* |
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* @var bool |
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*/ |
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protected $isClosed = false; |
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/** |
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* Indicates that we don't accept new requests but we are still waiting for |
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* pending requests to be resolved. |
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* |
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* @var bool |
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*/ |
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protected $isEnding = false; |
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/** |
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* @var Connection |
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*/ |
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protected $connection; |
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/** |
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* @param Connection $connection |
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* @param Parser $parser |
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*/ |
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public function __construct(Connection $connection, Parser $parser) |
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{ |
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$this->parser = $parser; |
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$this->connection = $connection; |
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$this->setConnectionHandlers(); |
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} |
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protected function setConnectionHandlers() |
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{ |
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$this->connection->on('data', function ($chunk) { |
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$parsed = $this->parser->parseRawResponse($chunk); |
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$this->resolveRequests($parsed); |
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}); |
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$this->connection->on('failed', function() { |
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$this->rejectPendingRequestsWith(new ConnectionClosedException()); |
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}); |
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$this->connection->on('close', function () { |
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if (!$this->isEnding) { |
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$this->emit('error', [new ConnectionClosedException()]); |
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} |
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}); |
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} |
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/** |
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* @param string $name |
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* @param array $args |
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* @return Promise|PromiseInterface |
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*/ |
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public function __call($name, $args) |
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{ |
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$request = new Request($name); |
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if($this->isEnding) { |
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$request->reject(new ConnectionClosedException()); |
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} else { |
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try { |
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$query = $this->parser->makeCommand($name, $args); |
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$this->connection->write($query); |
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$this->requests[] = $request; |
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} catch (WrongCommandException $e) { |
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$request->reject($e); |
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} |
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} |
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return $request->getPromise(); |
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} |
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/** |
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* @param array $responses |
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* @throws Exception |
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*/ |
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public function resolveRequests(array $responses) |
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{ |
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if (!$this->hasPendingRequests()) { |
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throw new Exception('Received unexpected response, no matching request found'); |
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} |
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foreach ($responses as $response) { |
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/* @var $request Request */ |
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$request = array_shift($this->requests); |
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try { |
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$parsedResponse = $this->parser->parseResponse($request->getCommand(), $response); |
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$request->resolve($parsedResponse); |
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} catch (FailedCommandException $exception) { |
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$request->reject($exception); |
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} |
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} |
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if ($this->isEnding && !$this->hasPendingRequests()) { |
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$this->close(); |
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} |
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} |
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/** |
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* Closes the connection when all requests are resolved |
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*/ |
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public function end() |
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{ |
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$this->isEnding = true; |
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if (!$this->hasPendingRequests()) { |
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$this->close(); |
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} |
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} |
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/** |
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* Forces closing the connection and rejects all pending requests |
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*/ |
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public function close() |
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{ |
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if ($this->isClosed) { |
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return; |
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} |
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$this->isEnding = true; |
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$this->isClosed = true; |
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$this->connection->close(); |
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$this->emit('close'); |
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$this->rejectPendingRequestsWith(new ConnectionClosedException()); |
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} |
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/** |
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* @param Exception $exception |
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*/ |
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protected function rejectPendingRequestsWith(Exception $exception) |
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{ |
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while($this->hasPendingRequests()) { |
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$request = array_shift($this->requests); |
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/* @var $request Request */ |
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$request->reject($exception); |
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} |
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} |
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/** |
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* @return bool |
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*/ |
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protected function hasPendingRequests() |
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{ |
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return !empty($this->requests); |
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} |
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} |
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seregazhuk /
php-react-memcached
