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|
<?php
namespace Clue\React\Redis;
use Clue\Redis\Protocol\Factory as ProtocolFactory;
use Clue\Redis\Protocol\Model\ErrorReply;
use Clue\Redis\Protocol\Model\ModelInterface;
use Clue\Redis\Protocol\Model\MultiBulkReply;
use Clue\Redis\Protocol\Parser\ParserException;
use Clue\Redis\Protocol\Parser\ParserInterface;
use Clue\Redis\Protocol\Serializer\SerializerInterface;
use Evenement\EventEmitter;
use React\Promise\Deferred;
use React\Stream\DuplexStreamInterface;
/**
* @internal
*/
class StreamingClient extends EventEmitter implements Client
{
private $stream;
private $parser;
private $serializer;
private $requests = array();
private $ending = false;
private $closed = false;
private $subscribed = 0;
private $psubscribed = 0;
public function __construct(DuplexStreamInterface $stream, ParserInterface $parser = null, SerializerInterface $serializer = null)
{
if ($parser === null || $serializer === null) {
$factory = new ProtocolFactory();
if ($parser === null) {
$parser = $factory->createResponseParser();
}
if ($serializer === null) {
$serializer = $factory->createSerializer();
}
}
$that = $this;
$stream->on('data', function($chunk) use ($parser, $that) {
try {
$models = $parser->pushIncoming($chunk);
} catch (ParserException $error) {
$that->emit('error', array(new \UnexpectedValueException(
'Invalid data received: ' . $error->getMessage() . ' (EBADMSG)',
defined('SOCKET_EBADMSG') ? SOCKET_EBADMSG : 77,
$error
)));
$that->close();
return;
}
foreach ($models as $data) {
try {
$that->handleMessage($data);
} catch (\UnderflowException $error) {
$that->emit('error', array($error));
$that->close();
return;
}
}
});
$stream->on('close', array($this, 'close'));
$this->stream = $stream;
$this->parser = $parser;
$this->serializer = $serializer;
}
public function __call($name, $args)
{
$request = new Deferred();
$promise = $request->promise();
$name = strtolower($name);
// special (p)(un)subscribe commands only accept a single parameter and have custom response logic applied
static $pubsubs = array('subscribe', 'unsubscribe', 'psubscribe', 'punsubscribe');
if ($this->ending) {
$request->reject(new \RuntimeException(
'Connection ' . ($this->closed ? 'closed' : 'closing'). ' (ENOTCONN)',
defined('SOCKET_ENOTCONN') ? SOCKET_ENOTCONN : 107
));
} elseif (count($args) !== 1 && in_array($name, $pubsubs)) {
$request->reject(new \InvalidArgumentException(
'PubSub commands limited to single argument (EINVAL)',
defined('SOCKET_EINVAL') ? SOCKET_EINVAL : 22
));
} elseif ($name === 'monitor') {
$request->reject(new \BadMethodCallException(
'MONITOR command explicitly not supported (ENOTSUP)',
defined('SOCKET_ENOTSUP') ? SOCKET_ENOTSUP : (defined('SOCKET_EOPNOTSUPP') ? SOCKET_EOPNOTSUPP : 95)
));
} else {
$this->stream->write($this->serializer->getRequestMessage($name, $args));
$this->requests []= $request;
}
if (in_array($name, $pubsubs)) {
$that = $this;
$subscribed =& $this->subscribed;
$psubscribed =& $this->psubscribed;
$promise->then(function ($array) use ($that, &$subscribed, &$psubscribed) {
$first = array_shift($array);
// (p)(un)subscribe messages are to be forwarded
$that->emit($first, $array);
// remember number of (p)subscribe topics
if ($first === 'subscribe' || $first === 'unsubscribe') {
$subscribed = $array[1];
} else {
$psubscribed = $array[1];
}
});
}
return $promise;
}
public function handleMessage(ModelInterface $message)
{
if (($this->subscribed !== 0 || $this->psubscribed !== 0) && $message instanceof MultiBulkReply) {
$array = $message->getValueNative();
$first = array_shift($array);
// pub/sub messages are to be forwarded and should not be processed as request responses
if (in_array($first, array('message', 'pmessage'))) {
$this->emit($first, $array);
return;
}
}
if (!$this->requests) {
throw new \UnderflowException(
'Unexpected reply received, no matching request found (ENOMSG)',
defined('SOCKET_ENOMSG') ? SOCKET_ENOMSG : 42
);
}
$request = array_shift($this->requests);
assert($request instanceof Deferred);
if ($message instanceof ErrorReply) {
$request->reject($message);
} else {
$request->resolve($message->getValueNative());
}
if ($this->ending && !$this->requests) {
$this->close();
}
}
public function end()
{
$this->ending = true;
if (!$this->requests) {
$this->close();
}
}
public function close()
{
if ($this->closed) {
return;
}
$this->ending = true;
$this->closed = true;
$remoteClosed = $this->stream->isReadable() === false && $this->stream->isWritable() === false;
$this->stream->close();
$this->emit('close');
// reject all remaining requests in the queue
while ($this->requests) {
$request = array_shift($this->requests);
assert($request instanceof Deferred);
if ($remoteClosed) {
$request->reject(new \RuntimeException(
'Connection closed by peer (ECONNRESET)',
defined('SOCKET_ECONNRESET') ? SOCKET_ECONNRESET : 104
));
} else {
$request->reject(new \RuntimeException(
'Connection closing (ECONNABORTED)',
defined('SOCKET_ECONNABORTED') ? SOCKET_ECONNABORTED : 103
));
}
}
}
}
|
