add and replace commands always expect response STORED

[Michal Linhard]

memcached add command can also result to answer NOT_STORED
when the key exists in the cache
and replace command may result to answer NOT_STORED when the key is not present.

see following scenarios:
$ echo -e "set a 0 0 1\r\n1\r" | nc test1 11211
STORED
$ echo -e "add a 0 0 1\r\n1\r" | nc test1 11211
NOT_STORED
$ echo -e "replace b 0 0 1\r\n1\r" | nc test1 11211
NOT_STORED

these cases are not considered by python-memcached library version 1.45

[Sean Reifschneider (jafo)]

I believe the Python code returns True when STORED is returned and False when NOT_STORED is returned. This seems valid to me in these cases, are you proposing something else should be done?

[Michal Linhard (michal-linhard)]

well there are actually three outcomes of the add/replace operations:
STORED
NOT_STORED
ERROR
and the last two are not distinguished
but the solution proposed in https://bugs.launchpad.net/python-memcached/+bug/684690 would probably work for me here too