Re: Nginx SRCache Module

agentzh · 2014-03-26T06:19:49+00:00

Hello! On Mon, Mar 24, 2014 at 3:29 AM, Heiko Möller wrote: > I'm currently developing a module that would profit greatly from executing > lua sc...

Re: Nginx SRCache Module

agentzh

Hello!

On Tue, Mar 25, 2014 at 3:04 PM, KSSK wrote:
> AgentZh,

Please do not capitalize my nick. Just call me agentzh, or my proper
given name, Yichun.

> Thank you for the SRcache module, I am planning to use it for my IT. I am
> trying to understand subrequests and the flow interaction with Nginx core
> proxy module.

Check out my NGINX tutorials:

    http://openresty.org/download/agentzh-nginx-tutorials-en.html

> Could you share some references to help me understand ? Do you have any
> flowchart that shows the interaction of SRcache with proxy/upstream ? I am
> confused at the filter processing stages of subrequest vs main request.
>

Basically, srcache_fetch works at the "access" phase of the main
request while srcache_store works at the "output filter" stage of the
main request. ngx_srcache never interacts directly with
ngx_http_upstream nor ngx_http_proxy_module and it works for arbitrary
content handler modules.

I'm cc'ing the openresty-en mailing list:
https://groups.google.com/group/openresty-en

You're recommended to join the list and put such discussions there :) Thanks!

Best regards,
-agentzh

agentzh

Hello!

On Tue, Mar 25, 2014 at 3:19 PM, Yichun Zhang (agentzh) wrote:
>> Could you share some references to help me understand ? Do you have any
>> flowchart that shows the interaction of SRcache with proxy/upstream ? I am
>> confused at the filter processing stages of subrequest vs main request.
>
> Basically, srcache_fetch works at the "access" phase of the main
> request while srcache_store works at the "output filter" stage of the
> main request. ngx_srcache never interacts directly with
> ngx_http_upstream nor ngx_http_proxy_module and it works for arbitrary
> content handler modules.
>

Oh, I just remember there is indeed a flow chart in the slides for my
talk at Percona Live MySQL Conference 2012:

    http://agentzh.org/misc/slides/libdrizzle-lua-nginx/#80

Or more specifically:

    http://agentzh.org/misc/slides/libdrizzle-lua-nginx/images/srcache.png

I'll add this graph to ngx_srcache module's official documentation :)

Thanks!
-agentzh