Using memcached from an Nginx module

Hi All,

I want to develop an Nginx HTTP module that gets several values from
memcache, performs some processing on them and returns the result to the
client. I want all memcache operations to be performed asynchronously
without blocking the worker process for maximum scalability. For this
reason, I can’t use libmemcached, and I’m looking for something that is
built on Nginx.
Is anyone familiar with a piece of code that does that ?

Some more details:
As I understand, it is theoretically possible to use the existing
memcache
upstream module for this, using subrequests. For example, to get a value
I
could start a subrequest for it and then handle the result when the
subrequest completes. But this approach sounds a bit awkward, and it has
the
unnecessary overhead of processing all these dummy HTTP requests.
What I would like ideally, is a module that exposes a function like -
memcache_get(keyname, callback, context), where the callback is called
either with the value if successful or an error code. I started writing
such
a module using the http_upstream module as reference, but found that it
takes quite a bit of code to get it done, with lots of edge cases to
handle
(like timeouts in each one of the states)

Thank you !

Eran

Posted at Nginx Forum:
http://forum.nginx.org/read.php?2,247481,247481#msg-247481

On Wed, Feb 12, 2014 at 1:45 PM, erankor2 [email protected] wrote:

Some more details:
a module using the http_upstream module as reference, but found that it
takes quite a bit of code to get it done, with lots of edge cases to handle
(like timeouts in each one of the states)

yeah, use the http://openresty.org/ framework which includes:
https://github.com/agentzh/lua-resty-memcached

it couldn’t be more perfect fit for what you’re asking.

Thank you for your reply.

But, actually, I am looking for a native C module…

Eran

Posted at Nginx Forum:
http://forum.nginx.org/read.php?2,247481,247483#msg-247483

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