# HG changeset patch
# User Valentin Bartenev <vbart@nginx.com>
# Date 1323439386 0
# Node ID 059260de158d9fe259811443b198951c08e81def
# Parent  5ee5ddec17b1c78125c9843806878f4d45c5c6e9
SCGI: added "if_not_empty" flag support to the "scgi_param" directive.

diff --git a/src/http/modules/ngx_http_scgi_module.c b/src/http/modules/ngx_http_scgi_module.c
--- a/src/http/modules/ngx_http_scgi_module.c
+++ b/src/http/modules/ngx_http_scgi_module.c
@@ -278,8 +278,8 @@ static ngx_command_t ngx_http_scgi_comma
       &ngx_http_scgi_next_upstream_masks },
 
     { ngx_string("scgi_param"),
-      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE2,
-      ngx_conf_set_keyval_slot,
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE23,
+      ngx_http_upstream_param_set_slot,
       NGX_HTTP_LOC_CONF_OFFSET,
       offsetof(ngx_http_scgi_loc_conf_t, params_source),
       NULL },
@@ -519,10 +519,10 @@ static ngx_int_t
 ngx_http_scgi_create_request(ngx_http_request_t *r)
 {
     u_char                        ch, *key, *val, *lowcase_key;
-    size_t                        len, allocated;
+    size_t                        len, key_len, val_len, allocated;
     ngx_buf_t                    *b;
     ngx_str_t                    *content_length;
-    ngx_uint_t                    i, n, hash, header_params;
+    ngx_uint_t                    i, n, hash, skip_empty, header_params;
     ngx_chain_t                  *cl, *body;
     ngx_list_part_t              *part;
     ngx_table_elt_t              *header, **ignored;
@@ -554,15 +554,21 @@ ngx_http_scgi_create_request(ngx_http_re
         while (*(uintptr_t *) le.ip) {
 
             lcode = *(ngx_http_script_len_code_pt *) le.ip;
-            len += lcode(&le);
+            key_len = lcode(&le);
 
-            while (*(uintptr_t *) le.ip) {
+            lcode = *(ngx_http_script_len_code_pt *) le.ip;
+            skip_empty = lcode(&le);
+
+            for (val_len = 0; *(uintptr_t *) le.ip; val_len += lcode(&le)) {
                 lcode = *(ngx_http_script_len_code_pt *) le.ip;
-                len += lcode(&le);
             }
-            len++;
+            le.ip += sizeof(uintptr_t);
 
-            le.ip += sizeof(uintptr_t);
+            if (skip_empty && val_len == 0) {
+                continue;
+            }
+
+            len += key_len + val_len + 1;
         }
     }
 
@@ -665,7 +671,34 @@ ngx_http_scgi_create_request(ngx_http_re
         e.request = r;
         e.flushed = 1;
 
-        while (*(uintptr_t *) e.ip) {
+        le.ip = scf->params_len->elts;
+
+        while (*(uintptr_t *) le.ip) {
+
+            lcode = *(ngx_http_script_len_code_pt *) le.ip;
+            lcode(&le); /* key length */
+
+            lcode = *(ngx_http_script_len_code_pt *) le.ip;
+            skip_empty = lcode(&le);
+
+            for (val_len = 0; *(uintptr_t *) le.ip; val_len += lcode(&le)) {
+                lcode = *(ngx_http_script_len_code_pt *) le.ip;
+            }
+            le.ip += sizeof(uintptr_t);
+
+            if (skip_empty && val_len == 0) {
+                e.skip = 1;
+
+                while (*(uintptr_t *) e.ip) {
+                    code = *(ngx_http_script_code_pt *) e.ip;
+                    code((ngx_http_script_engine_t *) &e);
+                }
+                e.ip += sizeof(uintptr_t);
+
+                e.skip = 0;
+
+                continue;
+            }
 
 #if (NGX_DEBUG)
             key = e.pos;
@@ -1323,9 +1356,9 @@ ngx_http_scgi_merge_params(ngx_conf_t *c
 #if (NGX_HTTP_CACHE)
     ngx_array_t                   params_merged;
 #endif
-    ngx_keyval_t                 *src;
     ngx_hash_key_t               *hk;
     ngx_hash_init_t               hash;
+    ngx_http_upstream_param_t    *src;
     ngx_http_script_compile_t     sc;
     ngx_http_script_copy_code_t  *copy;
 
@@ -1386,9 +1419,11 @@ ngx_http_scgi_merge_params(ngx_conf_t *c
 #if (NGX_HTTP_CACHE)
 
     if (conf->upstream.cache) {
-        ngx_keyval_t  *h, *s;
+        ngx_keyval_t               *h;
+        ngx_http_upstream_param_t  *s;
 
-        if (ngx_array_init(&params_merged, cf->temp_pool, 4, sizeof(ngx_keyval_t))
+        if (ngx_array_init(&params_merged, cf->temp_pool, 4,
+                           sizeof(ngx_http_upstream_param_t))
             != NGX_OK)
         {
             return NGX_ERROR;
@@ -1422,7 +1457,9 @@ ngx_http_scgi_merge_params(ngx_conf_t *c
                 return NGX_ERROR;
             }
 
-            *s = *h;
+            s->key = h->key;
+            s->value = h->value;
+            s->skip_empty = 0;
 
         next:
 
@@ -1464,6 +1501,15 @@ ngx_http_scgi_merge_params(ngx_conf_t *c
         copy->code = (ngx_http_script_code_pt) ngx_http_script_copy_len_code;
         copy->len = src[i].key.len + 1;
 
+        copy = ngx_array_push_n(conf->params_len,
+                                sizeof(ngx_http_script_copy_code_t));
+        if (copy == NULL) {
+            return NGX_ERROR;
+        }
+
+        copy->code = (ngx_http_script_code_pt) ngx_http_script_copy_len_code;
+        copy->len = src[i].skip_empty;
+
 
         size = (sizeof(ngx_http_script_copy_code_t)
                 + src[i].key.len + 1 + sizeof(uintptr_t) - 1)