Python 'Unknown flags on get' error while querying memcached

[OuterCloud]

I have solved this problem.

This is the solution in Chinese: https://www.cnblogs.com/LanTianYou/p/9204431.html

The solution is to modify the final else-block content in the method "_recv_value" in the python file "memcache.py".

The _recv_value method should be like this:

def _recv_value(self, server, flags, rlen):
    rlen += 2  # include \r\n
    buf = server.recv(rlen)
    if len(buf) != rlen:
        raise _Error("received %d bytes when expecting %d"
                     % (len(buf), rlen))

    if len(buf) == rlen:
        buf = buf[:-2]  # strip \r\n

    if flags & Client._FLAG_COMPRESSED:
        buf = self.decompressor(buf)
        flags &= ~Client._FLAG_COMPRESSED
    if flags == 0:
        # Bare bytes
        val = buf
    elif flags & Client._FLAG_TEXT:
        val = buf.decode('utf-8')
    elif flags & Client._FLAG_INTEGER:
        val = int(buf)
    elif flags & Client._FLAG_LONG:
        if six.PY3:
            val = int(buf)
        else:
            val = long(buf)  # noqa: F821
    elif flags & Client._FLAG_PICKLE:
        try:
            file = BytesIO(buf)
            unpickler = self.unpickler(file)
            if self.persistent_load:
                unpickler.persistent_load = self.persistent_load
            val = unpickler.load()
        except Exception as e:
            self.debuglog('Pickle error: %s\n' % e)
            return None
    else:
        self.debuglog("unknown flags on get: %x\n" % flags)
        # 注释掉这行
        # raise ValueError('Unknown flags on get: %x' % flags)
        # 设定返回值
        val = buf

    return val