CAS Delete support in any Python memcached client?

[mum...@gmail.com]

Hi all,

Just tried (and failed) to find any Python client with support for the new-ish CAS operations on the binary protocol (i.e. CAS delete etc.). Does anyone know of one - or have any plans for one? Or is there a fork of the C libmemcached library which supports it?

[dormando]

The C libmemcached library *should* support it already. I don't know why
any of the python wrappers wouldn't :/ Have you contacted the author of
one?

[James Haggerty]

A brief squiz at the delete function seems to suggest it doesn't:

http://bazaar.launchpad.net/~tangent-trunk/libmemcached/1.2/view/head:/libmemcached/delete.cc

Am I missing something?

(the most popular native Python clients use the text protocol, so can only do cas set; the others use libmemcached, which doesn't seem to support it)

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[Hirotaka Yamamoto]

In fact, the binary protocol specifies CAS operations only for Set/Add/Replace.

Delete with CAS seems unspecified.

[James Haggerty]

My reading of the binary protocol is that there is space for CAS but the behaviour is unspecified.

But the source certainly seems to support it:
https://github.com/memcached/memcached/blob/master/memcached.c#L2191

As do the release notes :)

http://code.google.com/p/memcached/wiki/ReleaseNotes140