[PATCH] Limit req: Added "off" parameter to the 'limit_req' directive

[Pavel V. Rochnyack]

# HG changeset patch
# User Pavel V. Rochnyack <pavel2000 at ngs.ru>
# Date 1454835814 -21600
# Node ID 42a41d68c88ff25514cb501de657e8e8d54b5099
# Parent  3577c021f21eb4de6d09c1d624ba77ee9ee1eb6d
Limit req: Added "off" parameter to the 'limit_req' directive.

Added support for inherited "limit_req" directives disable.

diff -r 3577c021f21e -r 42a41d68c88f src/http/modules/ngx_http_limit_req_module.c
--- a/src/http/modules/ngx_http_limit_req_module.c	Fri Feb 05 21:48:25 2016 +0300
+++ b/src/http/modules/ngx_http_limit_req_module.c	Sun Feb 07 15:03:34 2016 +0600
@@ -53,6 +53,7 @@ typedef struct {
     ngx_uint_t                   limit_log_level;
     ngx_uint_t                   delay_log_level;
     ngx_uint_t                   status_code;
+    ngx_uint_t                   off;            /* unsigned  off:1 */
 } ngx_http_limit_req_conf_t;
 
 
@@ -172,6 +173,10 @@ ngx_http_limit_req_handler(ngx_http_requ
     lrcf = ngx_http_get_module_loc_conf(r, ngx_http_limit_req_module);
     limits = lrcf->limits.elts;
 
+    if (lrcf->off) {
+        return NGX_DECLINED;
+    }
+
     excess = 0;
 
     rc = NGX_DECLINED;
@@ -698,6 +703,7 @@ ngx_http_limit_req_create_conf(ngx_conf_
 
     conf->limit_log_level = NGX_CONF_UNSET_UINT;
     conf->status_code = NGX_CONF_UNSET_UINT;
+    conf->off = NGX_CONF_UNSET_UINT;
 
     return conf;
 }
@@ -709,7 +715,9 @@ ngx_http_limit_req_merge_conf(ngx_conf_t
     ngx_http_limit_req_conf_t *prev = parent;
     ngx_http_limit_req_conf_t *conf = child;
 
-    if (conf->limits.elts == NULL) {
+    ngx_conf_merge_uint_value(conf->off, prev->off, 0);
+
+    if (conf->off == 0 && conf->limits.elts == NULL) {
         conf->limits = prev->limits;
     }
 
@@ -870,6 +878,31 @@ ngx_http_limit_req(ngx_conf_t *cf, ngx_c
 
     value = cf->args->elts;
 
+    ngx_conf_merge_uint_value(lrcf->off, lrcf->off, 0);
+
+    if (ngx_strcmp(value[1].data, "off") == 0) {
+        if (cf->args->nelts != 2) {
+            return "has invalid number of arguments";
+        }
+
+        if (lrcf->off || lrcf->limits.elts) {
+            ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+                               "\"limit_req off\" cannot be used with other "
+                               "\"limit_req\" directives on the same level");
+            return NGX_CONF_ERROR;
+        }
+
+        lrcf->off = 1;
+        return NGX_CONF_OK;
+    }
+
+    if (lrcf->off) {
+        ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+                           "\"limit_req off\" cannot be used with other "
+                           "\"limit_req\" directives on the same level");
+        return NGX_CONF_ERROR;
+    }
+
     shm_zone = NULL;
     burst = 0;
     nodelay = 0;