Parsing Variables to access them in a custom module

[Prudhvi Krishna Surapaneni]

On Thu, Jun 07, 2012 at 02:36:54PM +0400, Maxim Dounin wrote:
> Hello!
> 
> On Thu, Jun 07, 2012 at 09:02:44AM +0400, Vladimir Shebordaev wrote:
> 
> > 2012/6/7 Prudhvi Krishna Surapaneni <me at prudhvi.net>:
> > > Hi All,
> > > ? ? ? ?I am trying to write a module that needs to consume the regex matched
> > > ? ? ? ?variables like $1 and $2 and pass them as values to the module.
> > >
> > > ? ? ? ?Here is what i am trying to do
> > >
> > > ? ? ? ?/* -- CONFIG -- */
> > >
> > > ? ? ? ? ? ? ? ? ? ? ? ?location ~ /foo/([a-zA-Z0-9]+)/bar/([0-9]+) {
> > > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?my_module;
> > > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?my_module_first $1;
> > > ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?my_module_second $2;
> > > ? ? ? ? ? ? ? ? ? ? ? ?}
> > >
> > > ? ? ? ?/* -- CONFIG -- */
> > >
> > > ? ? ? ?Inside my module i have defined them as follows.
> > >
> > > ? ? ? ?/* -- CODE -- */
> > >
> > > ? ? ? ? ? ? ? ?typedef stuct {
> > > ? ? ? ? ? ? ? ? ? ? ? ?ngx_str_t my_module_first;
> > > ? ? ? ? ? ? ? ? ? ? ? ?ngx_str_t my_module_second;
> > > ? ? ? ? ? ? ? ?} ngx_http_my_module_loc_conf_t
> > >
> > > ? ?/* -- CODE -- */
> > >
> > > ? ? ? ?When trying to access the values from those variables i get the
> > > ? ? ? ?value $1 and $2 instead of the substitution. What am i missing?.
> > >
> > > ? ? ? ?Are these variables only availble for the rewrite module?.
> > 
> > Not particularly. But you should use the script engine to get captures
> > evaluated at run-time. See, e.g.  proxy module for an example.
> 
> I would rather recommend using complex values here, as it's 
> simpliest way to use variables.
> 
> Basically all it needs is using ngx_http_set_complex_value_slot 
> instead of ngx_conf_set_str_slot in configuration directive 
> definition, and an additional ngx_http_complex_value() call before 
> use.
> 
> Complete example can be found in secure link module.
> 
> Maxim Dounin
> 
Hello Maxim,
 This is exactly what i wanted. Thank you very much.

 -Prudhvi Krishna Surapaneni

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