/**
* 检查ack状态，如果返回的是标准错误包，说明命令处理失败了，读取错误信息
* @param binary string $res_body: 响应消息流
* @return false如果ack不是status ok, 否则返回true
*/
private function _ack_status_ok($res_body)
{
// load command type
$type = BigpipeFrame::get_command_type($res_body);
if (MetaAgentFrameType::UNKNOWN_TYPE == $type) {
BigpipeLog::warning('[no cmd_type in ack]');
return false;
}
if ($type == MetaAgentFrameType::ACK_ERROR_PACK) {
// 有错误，返回的是错误提示包
$ack = new MetaAgentErrorAckFrame();
if (!$ack->load($res_body)) {
$this->last_error_message = $ack->last_error_message();
} else {
$this->last_error_message = $ack->error_msg;
}
BigpipeLog::warning('[%s:%u][%s][ack error][cmd_type:%d][err:%s]', __FILE__, __LINE__, __FUNCTION__, $ack->command_type, $this->last_error_message);
return false;
// 不是正常ack
}
// 处理标准错误包
return true;
}
/**
* 接收一条cmd
* return cmd buffer on success or null on failure
*/
public function receive()
{
$res_body = $this->_connection->receive();
if (null != $res_body) {
// 看看是否为标准错误包
$cmd_type = BigpipeFrame::get_command_type($res_body);
if (BStompFrameType::ERROR == $cmd_type) {
$recv_cmd = new BStompErrorFrame();
if ($recv_cmd->load($res_body)) {
BigpipeLog::warning("[receive error ack frame][%s][error_code:%d]", $recv_cmd->error_message, $recv_cmd->error_no);
}
return null;
}
// end of 解析error frame
}
return $res_body;
}
