Module API and srv structure initialization.

[Maxim Dounin]

Hello!

On Wed, Jan 25, 2012 at 09:40:13AM +0100, Simone Margaritelli wrote:

> Hi guys, i'm new to this mailing list.
> 
> I'm writing a nginx handler module and i need to load a file in 
> a server directive inside the config, let's assume it's 
> something like:
> 
> server {
>   ...
>   mymodule-ruleset /etc/nginx/mymodule-rules.json;
>   ...
> }
> 
> So i have a server structure like:
> 
> typedef struct {
>   ...
>   ngx_str_t ruleset;
>   ...
> }
> ngx_mymodule_srv_conf_t;
> 
> I initialize the ruleset attribute inside the merge_srv_conf 
> handler:
> 
> ngx_conf_merge_str_value( conf->ruleset_path, prev->ruleset_path, DEFAULT_RULESET_PATH );
> 
> ( Where DEFAULT_RULESET_PATH is a constant #defined my me ).
> 
> The problem is, i have to load this file only once for server 
> directive, but the user could ignore the mymodule-ruleset using 
> its default value, so i can't use an handler to load it (it 
> could be never called).
> 
> Where's the best place to load this file? In the 
> postconfiguration handler ? If so, how do i retrieve the 
> srv_conf_t inside the postconfiguration handler ?

If you don't care much about the same file loaded multiple times 
if used in different server{}'s, easiest way is to load files in 
a merge server configuration handler.

Postconfiguration handler may be used as well, but you need main 
config then, and reference files you need to load there.  See e.g. 
access log module for an example of using of postconfiguration 
handler for a similar task (it uses postconfiguration handler to 
compile "combined" log format if it's used in config).

Maxim Dounin


> 
> Thanks for your time, i'm new to nginx developing and i'm 
> finding some trouble to understand its structure.
> 
> PS: I've already read the guides specified in the wiki, but 
> there's nothing so specific.



> 
> 
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