Re: Executing arbitrary lua scripts from an nginx module (in C)

agentzh · 2014-03-26T04:58:10+00:00

This requires to use pagespeed module. Pagespeed module requires it's own cache directory and uses its own caching mechanism . Is there some way to achieve t...

Re: Executing arbitrary lua scripts from an nginx module (in C)

agentzh

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 scripts. However, it would need to execute it from a request filter and
> not a config directive, ala *_by or *_by_file.
>
> Currently, I don't think that would be possible with the supplied api header
> in api/ngx_http_lua_api.h. Could you give me some pointers how that would be
> possible?
>

We can expose an API for this in ngx_http_lua_api.h. You're welcome to
create a patch for ngx_lua based on the existing code in
ngx_http_lua_header_filter_by_chunk or ngx_http_lua_log_by_chunk.

> workflow would be something like the following;
>
> - activate module
> - check predefined (or user supplied) paths for a lua script
> - if present, load file and cache
> - for each request (in a request filter), take the ngx_http_request_t, execute the lua code with it as parameter
> - depending on a return value set by the lua code do certain things
>

You also need to add a new "context" for such hooks. See

    https://github.com/chaoslawful/lua-nginx-module/blob/master/src/ngx_http_lua_common.h#L81

I'm cc'ing the openresty-en mailing list:
https://groups.google.com/group/openresty-en You're recommended to put
such discussion there :)

Regards,
-agentzh