public function probe(Stream $stream, $compression = false, $encryption = false)
{
$magic = Protocol::MAGIC;
if ($compression) {
$magic |= Protocol::FEATURE_COMPRESSION;
}
if ($encryption) {
$magic |= Protocol::FEATURE_ENCRYPTION;
}
$binary = $this->binary;
$stream->write($binary->writeUInt32($magic));
// list of supported protocol types (in order of preference)
$types = array(Protocol::TYPE_DATASTREAM, Protocol::TYPE_LEGACY);
// last item should get an END marker
$last = array_pop($types);
$types[] = $last | Protocol::TYPELIST_END;
foreach ($types as $type) {
$stream->write($binary->writeUInt32($type));
}
$deferred = new Deferred(function ($resolve, $reject) use($stream) {
$reject(new \RuntimeException('Cancelled'));
});
$buffer = '';
$fn = function ($data) use(&$buffer, &$fn, $stream, $deferred, $binary) {
$buffer .= $data;
if (isset($buffer[4])) {
$stream->removeListener('data', $fn);
$deferred->reject(new \UnexpectedValueException('Expected 4 bytes response, received more data, is this a quassel core?', Prober::ERROR_PROTOCOL));
return;
}
if (isset($buffer[3])) {
$stream->removeListener('data', $fn);
$deferred->resolve($binary->readUInt32($buffer));
}
};
$stream->on('data', $fn);
$stream->on('close', function () use($deferred) {
$deferred->reject(new \RuntimeException('Stream closed, does this (old?) server support probing?', Prober::ERROR_CLOSED));
});
return $deferred->promise();
}
