/**
* Send request and retrieve response to the connected disque node.
*
* @param array $args
* @return array|int|null|string
*
* @throws CommandException
* @throws StreamException
*/
protected function send(array $args = [])
{
$this->log->debug('send()ing command', $args);
$response = RespUtils::deserialize($this->stream->write(RespUtils::serialize($args)));
$this->log->debug('response', [$response]);
return $response;
}
/**
* @param StreamInterface $stream
*
* @return array|int|null|string
*
* @throws CommandException
* @throws \RuntimeException
*/
public static function deserialize(StreamInterface $stream)
{
$rsp = $stream->readLine();
list($type, $result) = [$rsp[0], trim(substr($rsp, 1, strlen($rsp)))];
switch ($type) {
case '-':
// ERRORS
throw new CommandException($result);
case '+':
// SIMPLE STRINGS
return $result;
case ':':
// INTEGERS
return (int) $result;
case '$':
// BULK STRINGS
$result = (int) $result;
if ($result == -1) {
return null;
}
return trim($stream->readBytes($result + 2));
case '*':
// ARRAYS
$cnt = (int) $result;
$out = [];
for ($i = 0; $i < $cnt; $i++) {
$out[] = static::deserialize($stream);
}
return $out;
default:
throw new \RuntimeException('unhandled protocol response: ' . $rsp);
}
}
/**
* return the internal stream url.
*
* @return string
*/
public function getNodeUrl()
{
return $this->connected->getNodeUrl();
}
protected function tearDown()
{
if ($this->stream) {
$this->stream->close();
}
}
