How to get the matched rule?

huangh · 2017-03-20T11:44:00+00:00

One other thought I had is that your clearing the certificates too early - once you clear the certificates you are past the point of no return. You will need...

How to get the matched rule?

huangh

Hi, I am using lua-nginx-module and would like to know how to get the matched rule for the request.

For example, suppose my nginx config is

location /foo/ {

...

}

location /bar/ {

...

}

When user request /foo/a, how I get the matched rule name "/foo/" from ngx.var or some other variables?

huangh

I could see nginx store the location name in r->loc_conf->name. Anyway I could fetch it from lua-nginx-module? Thank you in advance.

On Mon, Mar 20, 2017 at 11:44 AM, Haosong Huang <hu...@garena.com> wrote:

Hi, I am using lua-nginx-module and would like to know how to get the matched rule for the request.

For example, suppose my nginx config is

location /foo/ {
...
}

location /bar/ {
...
}

When user request /foo/a, how I get the matched rule name "/foo/" from ngx.var or some other variables?

.

Best Regards,

Haosong Huang

huangh

No sure if any other ways. I add a new variable to nginx to resolve my problem.

```

commit 51cea359faeed51f4565d107aa2d55282f87e135

Author: haosdent <haosdent@gmail.com>

Date: Mon Mar 20 19:29:08 2017 +0800

Added request_location in nginx variables.

diff --git a/src/http/ngx_http_variables.c b/src/http/ngx_http_variables.c

index f8271ab6..dadda696 100644

--- a/src/http/ngx_http_variables.c

+++ b/src/http/ngx_http_variables.c

@@ -74,6 +74,8 @@ static ngx_int_t ngx_http_variable_document_root(ngx_http_request_t *r,

ngx_http_variable_value_t *v, uintptr_t data);

static ngx_int_t ngx_http_variable_realpath_root(ngx_http_request_t *r,

ngx_http_variable_value_t *v, uintptr_t data);

+static ngx_int_t ngx_http_variable_request_location(ngx_http_request_t *r,

+ ngx_http_variable_value_t *v, uintptr_t data);

static ngx_int_t ngx_http_variable_request_filename(ngx_http_request_t *r,

ngx_http_variable_value_t *v, uintptr_t data);

static ngx_int_t ngx_http_variable_server_name(ngx_http_request_t *r,

@@ -222,6 +224,9 @@ static ngx_http_variable_t ngx_http_core_variables[] = {

{ ngx_string("realpath_root"), NULL,

ngx_http_variable_realpath_root, 0, NGX_HTTP_VAR_NOCACHEABLE, 0 },

+ { ngx_string("request_location"), NULL,

+ ngx_http_variable_request_location, 0, NGX_HTTP_VAR_NOCACHEABLE, 0 },

{ ngx_string("query_string"), NULL, ngx_http_variable_request,

offsetof(ngx_http_request_t, args),

NGX_HTTP_VAR_NOCACHEABLE, 0 },

@@ -1531,6 +1536,24 @@ ngx_http_variable_realpath_root(ngx_http_request_t *r,

static ngx_int_t

+ngx_http_variable_request_location(ngx_http_request_t *r,

+ ngx_http_variable_value_t *v, uintptr_t data)

+ ngx_http_core_loc_conf_t *clcf;

+ clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);

+ v->len = clcf->name.len;

+ v->valid = 1;

+ v->no_cacheable = 0;

+ v->not_found = 0;

+ v->data = "">

+ return NGX_OK;

+static ngx_int_t

ngx_http_variable_request_filename(ngx_http_request_t *r,

ngx_http_variable_value_t *v, uintptr_t data)

{

```

On Mon, Mar 20, 2017 at 5:42 PM, Haosong Huang <hu...@garena.com> wrote:

I could see nginx store the location name in r->loc_conf->name. Anyway I could fetch it from lua-nginx-module? Thank you in advance.

On Mon, Mar 20, 2017 at 11:44 AM, Haosong Huang <hu...@garena.com> wrote:
Hi, I am using lua-nginx-module and would like to know how to get the matched rule for the request.

For example, suppose my nginx config is

location /foo/ {
...
}

location /bar/ {
...
}

When user request /foo/a, how I get the matched rule name "/foo/" from ngx.var or some other variables?

.

--
Best Regards,
Haosong Huang

Best Regards,

Haosong Huang

igor.clark

Hello,

If you're able to use a regular _expression_ match in your nginx location, you could do something like this without writing any C code:

location ~ "^(?<matched_rule>/(foo|bar)/)$" {

    rewrite_by_lua_block {
        ngx.header[ "content-type" ] = 'text/plain'
        ngx.say( ngx.var.matched_rule )
    }
}

Probably not quite as quick, but if you set 'pcre_jit on;' in your nginx config, then it shouldn't be too bad (though I welcome being informed otherwise :-)).

HTH,
Igor

On 20/03/2017 11:32, Haosong Huang wrote:

No sure if any other ways. I add a new variable to nginx to resolve my problem.

```

commit 51cea359faeed51f4565d107aa2d55282f87e135

Author: haosdent <haosdent@gmail.com>

Date: Mon Mar 20 19:29:08 2017 +0800

Added request_location in nginx variables.

diff --git a/src/http/ngx_http_variables.c b/src/http/ngx_http_variables.c

index f8271ab6..dadda696 100644

--- a/src/http/ngx_http_variables.c

+++ b/src/http/ngx_http_variables.c

@@ -74,6 +74,8 @@ static ngx_int_t ngx_http_variable_document_root(ngx_http_request_t *r,

ngx_http_variable_value_t *v, uintptr_t data);

static ngx_int_t ngx_http_variable_realpath_root(ngx_http_request_t *r,

ngx_http_variable_value_t *v, uintptr_t data);

+static ngx_int_t ngx_http_variable_request_location(ngx_http_request_t *r,

+ ngx_http_variable_value_t *v, uintptr_t data);

static ngx_int_t ngx_http_variable_request_filename(ngx_http_request_t *r,

ngx_http_variable_value_t *v, uintptr_t data);

static ngx_int_t ngx_http_variable_server_name(ngx_http_request_t *r,

@@ -222,6 +224,9 @@ static ngx_http_variable_t ngx_http_core_variables[] = {

{ ngx_string("realpath_root"), NULL,

ngx_http_variable_realpath_root, 0, NGX_HTTP_VAR_NOCACHEABLE, 0 },

+ { ngx_string("request_location"), NULL,

+ ngx_http_variable_request_location, 0, NGX_HTTP_VAR_NOCACHEABLE, 0 },

+

{ ngx_string("query_string"), NULL, ngx_http_variable_request,

offsetof(ngx_http_request_t, args),

NGX_HTTP_VAR_NOCACHEABLE, 0 },

@@ -1531,6 +1536,24 @@ ngx_http_variable_realpath_root(ngx_http_request_t *r,

static ngx_int_t

+ngx_http_variable_request_location(ngx_http_request_t *r,

+ ngx_http_variable_value_t *v, uintptr_t data)

+{

+ ngx_http_core_loc_conf_t *clcf;

+

+ clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);

+

+ v->len = clcf->name.len;

+ v->valid = 1;

+ v->no_cacheable = 0;

+ v->not_found = 0;

+ v->data = "">
+

+ return NGX_OK;

+}

+

+

+static ngx_int_t

ngx_http_variable_request_filename(ngx_http_request_t *r,

ngx_http_variable_value_t *v, uintptr_t data)

{

```

On Mon, Mar 20, 2017 at 5:42 PM, Haosong Huang <hu...@garena.com> wrote:

I could see nginx store the location name in r->loc_conf->name. Anyway I could fetch it from lua-nginx-module? Thank you in advance.

On Mon, Mar 20, 2017 at 11:44 AM, Haosong Huang <hu...@garena.com> wrote:

Hi, I am using lua-nginx-module and would like to know how to get the matched rule for the request.

For example, suppose my nginx config is

location /foo/ {

...

}

location /bar/ {

...

}

When user request /foo/a, how I get the matched rule name "/foo/" from ngx.var or some other variables?

.