def parse_response_head()

in dubbo/codec/decoder.py [0:0]

• 17 lines of code
• 7 McCabe index (conditional complexity)

def parse_response_head(response_head):
    """
    对响应头部的字节做解析
    :param response_head:
    :return:
    """
    # Magic number
    if not (response_head[0] == 0xda and response_head[1] == 0xbb):
        raise DubboException('illegal response')

    # 第三位为1表示这是一个心跳包
    if response_head[2] & 0x20 == 0x20:
        if response_head[2] & 0x80 == 0x80:
            # 第一位为1，一个心跳请求的包
            heartbeat = 2
        else:
            # 第一位为0，一个心跳响应的包
            heartbeat = 1
            response_status = response_head[3]
            if response_status != 20:
                raise DubboException(response_status_message[response_status])
    else:
        heartbeat = 0
        response_status = response_head[3]
        if response_status != 20:
            raise DubboResponseException(response_status_message[response_status])
    return heartbeat, unpack('!i', response_head[12:])[0]