Add support for 'nocache' flag to map directive

[Ruslan Ermilov]

On Sat, Dec 03, 2016 at 09:06:16PM +0000, Eran Kornblau wrote:
> As I got no objections... :) patch attached

There was a similar patch circulating locally circa 2013.
I've updated it today.  Please give it a try.

# HG changeset patch
# User Ruslan Ermilov <ru at nginx.com>
# Date 1481040301 -10800
#      Tue Dec 06 19:05:01 2016 +0300
# Node ID a68b9457f36bc0f4bfdf44722e966e790c7fd7f0
# Parent  b5ba6cf04d0aa69260f58d5416532c3edc7feb56
Map: simplified "map" block parser.

No functional changes.

diff --git a/src/http/modules/ngx_http_map_module.c b/src/http/modules/ngx_http_map_module.c
--- a/src/http/modules/ngx_http_map_module.c
+++ b/src/http/modules/ngx_http_map_module.c
@@ -393,8 +393,9 @@ ngx_http_map(ngx_conf_t *cf, ngx_command
     {
         ctx->hostnames = 1;
         return NGX_CONF_OK;
+    }
 
-    } else if (cf->args->nelts != 2) {
+    if (cf->args->nelts != 2) {
         ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                            "invalid number of the map parameters");
         return NGX_CONF_ERROR;
diff --git a/src/stream/ngx_stream_map_module.c b/src/stream/ngx_stream_map_module.c
--- a/src/stream/ngx_stream_map_module.c
+++ b/src/stream/ngx_stream_map_module.c
@@ -392,8 +392,9 @@ ngx_stream_map(ngx_conf_t *cf, ngx_comma
     {
         ctx->hostnames = 1;
         return NGX_CONF_OK;
+    }
 
-    } else if (cf->args->nelts != 2) {
+    if (cf->args->nelts != 2) {
         ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                            "invalid number of the map parameters");
         return NGX_CONF_ERROR;
# HG changeset patch
# User Ruslan Ermilov <ru at nginx.com>
# Date 1481040307 -10800
#      Tue Dec 06 19:05:07 2016 +0300
# Node ID 414e7061c1b6fa89003e1c5600921cb48d6d977f
# Parent  a68b9457f36bc0f4bfdf44722e966e790c7fd7f0
Map: the "volatile" parameter.

diff --git a/src/http/modules/ngx_http_map_module.c b/src/http/modules/ngx_http_map_module.c
--- a/src/http/modules/ngx_http_map_module.c
+++ b/src/http/modules/ngx_http_map_module.c
@@ -26,7 +26,8 @@ typedef struct {
 
     ngx_http_variable_value_t  *default_value;
     ngx_conf_t                 *cf;
-    ngx_uint_t                  hostnames;      /* unsigned  hostnames:1 */
+    unsigned                    hostnames:1;
+    unsigned                    no_cacheable:1;
 } ngx_http_map_conf_ctx_t;
 
 
@@ -265,6 +266,7 @@ ngx_http_map_block(ngx_conf_t *cf, ngx_c
     ctx.default_value = NULL;
     ctx.cf = &save;
     ctx.hostnames = 0;
+    ctx.no_cacheable = 0;
 
     save = *cf;
     cf->pool = pool;
@@ -281,6 +283,10 @@ ngx_http_map_block(ngx_conf_t *cf, ngx_c
         return rv;
     }
 
+    if (ctx.no_cacheable) {
+        var->flags |= NGX_HTTP_VAR_NOCACHEABLE;
+    }
+
     map->default_value = ctx.default_value ? ctx.default_value:
                                              &ngx_http_variable_null_value;
 
@@ -395,6 +401,13 @@ ngx_http_map(ngx_conf_t *cf, ngx_command
         return NGX_CONF_OK;
     }
 
+    if (cf->args->nelts == 1
+        && ngx_strcmp(value[0].data, "volatile") == 0)
+    {
+        ctx->no_cacheable = 1;
+        return NGX_CONF_OK;
+    }
+
     if (cf->args->nelts != 2) {
         ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                            "invalid number of the map parameters");
diff --git a/src/stream/ngx_stream_map_module.c b/src/stream/ngx_stream_map_module.c
--- a/src/stream/ngx_stream_map_module.c
+++ b/src/stream/ngx_stream_map_module.c
@@ -26,7 +26,8 @@ typedef struct {
 
     ngx_stream_variable_value_t  *default_value;
     ngx_conf_t                   *cf;
-    ngx_uint_t                    hostnames;      /* unsigned  hostnames:1 */
+    unsigned                      hostnames:1;
+    unsigned                      no_cacheable:1;
 } ngx_stream_map_conf_ctx_t;
 
 
@@ -264,6 +265,7 @@ ngx_stream_map_block(ngx_conf_t *cf, ngx
     ctx.default_value = NULL;
     ctx.cf = &save;
     ctx.hostnames = 0;
+    ctx.no_cacheable = 0;
 
     save = *cf;
     cf->pool = pool;
@@ -280,6 +282,10 @@ ngx_stream_map_block(ngx_conf_t *cf, ngx
         return rv;
     }
 
+    if (ctx.no_cacheable) {
+        var->flags |= NGX_STREAM_VAR_NOCACHEABLE;
+    }
+
     map->default_value = ctx.default_value ? ctx.default_value:
                                              &ngx_stream_variable_null_value;
 
@@ -394,6 +400,13 @@ ngx_stream_map(ngx_conf_t *cf, ngx_comma
         return NGX_CONF_OK;
     }
 
+    if (cf->args->nelts == 1
+        && ngx_strcmp(value[0].data, "volatile") == 0)
+    {
+        ctx->no_cacheable = 1;
+        return NGX_CONF_OK;
+    }
+
     if (cf->args->nelts != 2) {
         ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                            "invalid number of the map parameters");