How to get value of location directive in lua script.

pkamal.work · 2014-09-26T00:49:00+00:00

Hi agentzh , Thanks agentzh ,the body_filter_by_lua is working fine .The problem is ,the html page was cached in my browser .so when were...

How to get value of location directive in lua script.

pkamal.work

I want to get location directive value in lua script . I know i can get in Uri but still i need to get value.

Is it possible ? please let me know.

agentzh

Hello!

On Thu, Sep 25, 2014 at 9:48 AM, kamalp wrote:
> I want to get  location directive value in  lua script .  I know i can get
> in Uri but still i need to get value.
>
> Is it possible ? please let me know.
>

Do you mean for the following configuration

    location = /foo {
        ...
    }

you want to fetch the string "= /foo" from within your Lua code?

Yes, it's technically possible but ngx_lua does not provide an API
yet. I think this is worth adding an "ngx.config.location()" API
function. Will you provde a patch? Basically the implementation should
look something like this (pseudo C code, just to demonstrate the basic
idea):

    clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);

    return string_concat(clcf->noname ? "*" : (clcf->exact_match ? "="
: ""), &clcf->name)

See the ngx_http_core_find_config_phase function in the nginx C for
more details.

Regards,
-agentzh

agentzh

Hello!

On Thu, Sep 25, 2014 at 9:48 AM, kamalp wrote:
> I want to get  location directive value in  lua script .  I know i can get
> in Uri but still i need to get value.
>

You can use the $location variable provided by the ngx_coolkit module
(which is enabled by default in the OpenResty bundle). Below are some
examples:

    location ~ '^/foo[a-z]+' {
        content_by_lua 'ngx.say("location: ", ngx.var.location)';
    }

    location = /bar/123 {
        content_by_lua 'ngx.say("location: ", ngx.var.location)';
    }

    location /baz {
        content_by_lua 'ngx.say("location: ", ngx.var.location)';
    }

    location = /entry {
        content_by_lua 'ngx.exec("@named")';
    }

    location @named {
        content_by_lua 'ngx.say("location: ", ngx.var.location)';
    }

then:

    $ curl localhost:8080/fool123
    location: /fool

    $ curl localhost:8080/bar/123
    location: /bar/123

    $ curl localhost:8080/baz/hello
    location: /baz

    $ curl localhost:8080/entry
    location: @named

Regards,
-agentzh