public function read(Predis_Connection $connection)
{
$chunk = $connection->readLine();
$prefix = $chunk[0];
$payload = substr($chunk, 1);
switch ($prefix) {
case '+':
// inline
switch ($payload) {
case 'OK':
return true;
case 'QUEUED':
return new Predis_ResponseQueued();
default:
return $payload;
}
case '$':
// bulk
$size = (int) $payload;
if ($size === -1) {
return null;
}
return substr($connection->readBytes($size + 2), 0, -2);
case '*':
// multi bulk
$count = (int) $payload;
if ($count === -1) {
return null;
}
if ($this->_iterableMultibulk) {
return new Predis_Shared_MultiBulkResponseIterator($connection, $count);
}
$multibulk = array();
for ($i = 0; $i < $count; $i++) {
$multibulk[$i] = $this->read($connection);
}
return $multibulk;
case ':':
// integer
return (int) $payload;
case '-':
// error
$errorMessage = substr($payload, 4);
if ($this->_throwErrors) {
throw new Predis_ServerException($errorMessage);
}
return new Predis_ResponseError($errorMessage);
default:
throw new Predis_CommunicationException($connection, "Unknown prefix: '{$prefix}'");
}
}
private static function discardNewLine(Predis_Connection $connection)
{
if ($connection->readBytes(2) !== Predis_Protocol::NEWLINE) {
Predis_Shared_Utils::onCommunicationException(new Predis_MalformedServerResponse($connection, 'Did not receive a new-line at the end of a bulk response'));
}
}
public function handle(Predis_Connection $connection, $lengthString)
{
$length = (int) $lengthString;
if ($length != $lengthString) {
Predis_Shared_Utils::onCommunicationException(new Predis_MalformedServerResponse($connection, "Cannot parse '{$length}' as data length"));
}
if ($length >= 0) {
return substr($connection->readBytes($length + 2), 0, -2);
}
if ($length == -1) {
return null;
}
}