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Limit req: $limit_req_status variable.

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The variable takes one of the values: PASSED, DELAYED, REJECTED,
DELAYED_DRY_RUN or REJECTED_DRY_RUN.
This commit is contained in:
Roman Arutyunyan 2019-11-06 19:03:18 +03:00
parent 203898505c
commit 02ec15dc0d
2 changed files with 76 additions and 5 deletions
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79
src/http/modules/ngx_http_limit_req_module.c
View File

@ -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_account(ngx_http_limit_req_limit_t *limits,
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_conf_t *cf, ngx_command_t *cmd,
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_commands[] = {
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_request_t *r)
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_request_t *r)
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_request_t *r)
}
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_request_t *r)
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_request_t *r)
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_zone_t *shm_zone, void *data)
}
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)
{
@ -995,6 +1047,25 @@ 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)
{
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)
{

2
src/http/ngx_http_request.h
View File

@ -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;