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Socket.php
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Socket.php
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<?php
namespace Disque\Connection;
use Exception;
use Disque\Command\CommandInterface;
use Disque\Connection\Response\ResponseException;
use Disque\Connection\Response;
/**
* This class is greatly inspired by `Predis\Connection\StreamConnection`,
* which is part of [predis](https://github.com/nrk/predis) and was developed
* by Daniele Alessandri <suppakilla@gmail.com>. All credits go to him where
* relevant.
*/
class Socket extends BaseConnection implements ConnectionInterface
{
/**
* Socket handle
*
* @var resource
*/
protected $socket;
/**
* Response handlers
*
* The characters used as keys are part of the Redis/Disque protocol.
* Disque uses the same response protocol as Redis, therefore
* @see http://redis.io/topics/protocol
*
* @var array
*/
private $responseHandlers = [
'+' => Response\StringResponse::class,
'-' => Response\ErrorResponse::class,
':' => Response\IntResponse::class,
'$' => Response\TextResponse::class,
'*' => Response\ArrayResponse::class
];
/**
* @inheritdoc
*/
public function connect($connectionTimeout = 0, $responseTimeout = null)
{
parent::connect($connectionTimeout, $responseTimeout);
$this->socket = $this->getSocket(
$this->host,
$this->port,
(float) $connectionTimeout
);
if (!is_resource($this->socket)) {
throw new ConnectionException("Could not connect to {$this->host}:{$this->port}");
}
stream_set_blocking($this->socket, 1);
if (!is_null($responseTimeout)) {
stream_set_timeout($this->socket, $responseTimeout);
}
}
/**
* @inheritdoc
*/
public function disconnect()
{
if (!$this->isConnected()) {
return;
}
fclose($this->socket);
$this->socket = null;
}
/**
* @inheritdoc
*/
public function isConnected()
{
return (isset($this->socket) && is_resource($this->socket));
}
/**
* @inheritdoc
*/
public function execute(CommandInterface $command)
{
$commandName = $command->getCommand();
$arguments = $command->getArguments();
$totalArguments = count($arguments);
$parts = [
'*' . ($totalArguments + 1),
'$' . strlen($commandName),
$commandName
];
for ($i=0; $i < $totalArguments; $i++) {
$argument = $arguments[$i];
$parts[] = '$' . strlen($argument);
$parts[] = $argument;
}
$this->send(implode("\r\n", $parts)."\r\n");
return $this->receive($command->isBlocking());
}
/**
* Execute a command on the connection
*
* @param string $data Data to send
* @throws ConnectionException
*/
public function send($data)
{
$this->shouldBeConnected();
do {
$length = strlen($data);
$bytes = fwrite($this->socket, $data);
if (empty($bytes)) {
throw new ConnectionException("Could not write {$length} bytes to client");
} elseif ($bytes === $length) {
break;
}
$data = substr($data, $bytes);
} while ($length > 0);
}
/**
* Read data from connection
*
* @param bool $keepWaiting If `true`, timeouts on stream read will be ignored
* @return mixed Data received
*
* @throws ConnectionException
* @throws ResponseException
*/
public function receive($keepWaiting = false)
{
$this->shouldBeConnected();
$type = $this->getType($keepWaiting);
if (!array_key_exists($type, $this->responseHandlers)) {
throw new ResponseException("Don't know how to handle a response of type {$type}");
}
$responseHandlerClass = $this->responseHandlers[$type];
$responseHandler = new $responseHandlerClass($this->getData());
$responseHandler->setReader(function ($bytes) {
return fread($this->socket, $bytes);
});
$responseHandler->setReceiver(function () use ($keepWaiting) {
return $this->receive($keepWaiting);
});
$response = $responseHandler->parse();
/**
* If Disque returned an error, raise it in form of an exception
* @see Disque\Connection\Response\ErrorResponse::parse()
*/
if ($response instanceof ResponseException) {
throw $response;
}
return $response;
}
/**
* Build actual socket
*
* @param string $host Host
* @param int $port Port
* @param float $timeout Timeout
* @return resource Socket
*/
protected function getSocket($host, $port, $timeout)
{
return stream_socket_client("tcp://{$host}:{$port}", $error, $message, $timeout, STREAM_CLIENT_CONNECT | STREAM_CLIENT_PERSISTENT);
}
/**
* Get the first byte from Disque, which contains the data type
*
* @param bool $keepWaiting If `true`, timeouts on stream read will be ignored
* @return string A single char
* @throws ConnectionException
*/
private function getType($keepWaiting = false)
{
$type = null;
while (!feof($this->socket)) {
$type = fgetc($this->socket);
if ($type !== false && $type !== '') {
break;
}
$info = stream_get_meta_data($this->socket);
if (!$keepWaiting || !$info['timed_out']) {
break;
}
}
if ($type === false || $type === '') {
throw new ConnectionException('Nothing received while reading from client');
}
return $type;
}
/**
* Get a line of data
*
* @return string Line of data
* @throws ConnectionException
*/
private function getData()
{
$data = fgets($this->socket);
if ($data === false || $data === '') {
throw new ConnectionException('Nothing received while reading from client');
}
return $data;
}
/**
* We should be connected
*
* @return void
* @throws ConnectionException
*/
private function shouldBeConnected()
{
if (!$this->isConnected()) {
throw new ConnectionException('No connection established');
}
}
}