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[nginx] Limit req: $limit_req_status variable.

Roman Arutyunyan
November 06, 2019 11:08AM
details: https://hg.nginx.org/nginx/rev/776d1bebdca2
branches:
changeset: 7592:776d1bebdca2
user: Roman Arutyunyan <arut@nginx.com>
date: Wed Nov 06 19:03:18 2019 +0300
description:
Limit req: $limit_req_status variable.

The variable takes one of the values: PASSED, DELAYED, REJECTED,
DELAYED_DRY_RUN or REJECTED_DRY_RUN.

diffstat:

src/http/modules/ngx_http_limit_req_module.c | 79 ++++++++++++++++++++++++++-
src/http/ngx_http_request.h | 2 +-
2 files changed, 76 insertions(+), 5 deletions(-)

diffs (184 lines):

diff -r 89adf49fe76a -r 776d1bebdca2 src/http/modules/ngx_http_limit_req_module.c
--- a/src/http/modules/ngx_http_limit_req_module.c Mon Oct 21 20:22:30 2019 +0300
+++ b/src/http/modules/ngx_http_limit_req_module.c Wed Nov 06 19:03:18 2019 +0300
@@ -10,6 +10,13 @@
#include <ngx_http.h>


+#define NGX_HTTP_LIMIT_REQ_PASSED 1
+#define NGX_HTTP_LIMIT_REQ_DELAYED 2
+#define NGX_HTTP_LIMIT_REQ_REJECTED 3
+#define NGX_HTTP_LIMIT_REQ_DELAYED_DRY_RUN 4
+#define NGX_HTTP_LIMIT_REQ_REJECTED_DRY_RUN 5
+
+
typedef struct {
u_char color;
u_char dummy;
@@ -65,6 +72,8 @@ static ngx_msec_t ngx_http_limit_req_acc
static void ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx,
ngx_uint_t n);

+static ngx_int_t ngx_http_limit_req_status_variable(ngx_http_request_t *r,
+ ngx_http_variable_value_t *v, uintptr_t data);
static void *ngx_http_limit_req_create_conf(ngx_conf_t *cf);
static char *ngx_http_limit_req_merge_conf(ngx_conf_t *cf, void *parent,
void *child);
@@ -72,6 +81,7 @@ static char *ngx_http_limit_req_zone(ngx
void *conf);
static char *ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
+static ngx_int_t ngx_http_limit_req_add_variables(ngx_conf_t *cf);
static ngx_int_t ngx_http_limit_req_init(ngx_conf_t *cf);


@@ -131,7 +141,7 @@ static ngx_command_t ngx_http_limit_req


static ngx_http_module_t ngx_http_limit_req_module_ctx = {
- NULL, /* preconfiguration */
+ ngx_http_limit_req_add_variables, /* preconfiguration */
ngx_http_limit_req_init, /* postconfiguration */

NULL, /* create main configuration */
@@ -161,6 +171,24 @@ ngx_module_t ngx_http_limit_req_module
};


+static ngx_http_variable_t ngx_http_limit_req_vars[] = {
+
+ { ngx_string("limit_req_status"), NULL,
+ ngx_http_limit_req_status_variable, 0, NGX_HTTP_VAR_NOCACHEABLE, 0 },
+
+ ngx_http_null_variable
+};
+
+
+static ngx_str_t ngx_http_limit_req_status[] = {
+ ngx_string("PASSED"),
+ ngx_string("DELAYED"),
+ ngx_string("REJECTED"),
+ ngx_string("DELAYED_DRY_RUN"),
+ ngx_string("REJECTED_DRY_RUN")
+};
+
+
static ngx_int_t
ngx_http_limit_req_handler(ngx_http_request_t *r)
{
@@ -173,7 +201,7 @@ ngx_http_limit_req_handler(ngx_http_requ
ngx_http_limit_req_conf_t *lrcf;
ngx_http_limit_req_limit_t *limit, *limits;

- if (r->main->limit_req_set) {
+ if (r->main->limit_req_status) {
return NGX_DECLINED;
}

@@ -232,8 +260,6 @@ ngx_http_limit_req_handler(ngx_http_requ
return NGX_DECLINED;
}

- r->main->limit_req_set = 1;
-
if (rc == NGX_BUSY || rc == NGX_ERROR) {

if (rc == NGX_BUSY) {
@@ -261,9 +287,12 @@ ngx_http_limit_req_handler(ngx_http_requ
}

if (lrcf->dry_run) {
+ r->main->limit_req_status = NGX_HTTP_LIMIT_REQ_REJECTED_DRY_RUN;
return NGX_DECLINED;
}

+ r->main->limit_req_status = NGX_HTTP_LIMIT_REQ_REJECTED;
+
return lrcf->status_code;
}

@@ -276,6 +305,7 @@ ngx_http_limit_req_handler(ngx_http_requ
delay = ngx_http_limit_req_account(limits, n, &excess, &limit);

if (!delay) {
+ r->main->limit_req_status = NGX_HTTP_LIMIT_REQ_PASSED;
return NGX_DECLINED;
}

@@ -285,9 +315,12 @@ ngx_http_limit_req_handler(ngx_http_requ
excess / 1000, excess % 1000, &limit->shm_zone->shm.name);

if (lrcf->dry_run) {
+ r->main->limit_req_status = NGX_HTTP_LIMIT_REQ_DELAYED_DRY_RUN;
return NGX_DECLINED;
}

+ r->main->limit_req_status = NGX_HTTP_LIMIT_REQ_DELAYED;
+
if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
@@ -711,6 +744,25 @@ ngx_http_limit_req_init_zone(ngx_shm_zon
}


+static ngx_int_t
+ngx_http_limit_req_status_variable(ngx_http_request_t *r,
+ ngx_http_variable_value_t *v, uintptr_t data)
+{
+ if (r->main->limit_req_status == 0) {
+ v->not_found = 1;
+ return NGX_OK;
+ }
+
+ v->valid = 1;
+ v->no_cacheable = 0;
+ v->not_found = 0;
+ v->len = ngx_http_limit_req_status[r->main->limit_req_status - 1].len;
+ v->data = ngx_http_limit_req_status[r->main->limit_req_status - 1].data;
+
+ return NGX_OK;
+}
+
+
static void *
ngx_http_limit_req_create_conf(ngx_conf_t *cf)
{
@@ -996,6 +1048,25 @@ ngx_http_limit_req(ngx_conf_t *cf, ngx_c


static ngx_int_t
+ngx_http_limit_req_add_variables(ngx_conf_t *cf)
+{
+ ngx_http_variable_t *var, *v;
+
+ for (v = ngx_http_limit_req_vars; v->name.len; v++) {
+ var = ngx_http_add_variable(cf, &v->name, v->flags);
+ if (var == NULL) {
+ return NGX_ERROR;
+ }
+
+ var->get_handler = v->get_handler;
+ var->data = v->data;
+ }
+
+ return NGX_OK;
+}
+
+
+static ngx_int_t
ngx_http_limit_req_init(ngx_conf_t *cf)
{
ngx_http_handler_pt *h;
diff -r 89adf49fe76a -r 776d1bebdca2 src/http/ngx_http_request.h
--- a/src/http/ngx_http_request.h Mon Oct 21 20:22:30 2019 +0300
+++ b/src/http/ngx_http_request.h Wed Nov 06 19:03:18 2019 +0300
@@ -513,7 +513,7 @@ struct ngx_http_request_s {
* we use the single bits in the request structure
*/
unsigned limit_conn_set:1;
- unsigned limit_req_set:1;
+ unsigned limit_req_status:3;

unsigned limit_rate_set:1;
unsigned limit_rate_after_set:1;
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[nginx] Limit req: $limit_req_status variable.

Roman Arutyunyan 93 November 06, 2019 11:08AM



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