Core: show file contents only once while dumping configuration.

Files are considered the same if the path used by nginx during parsing matches.

src/core/ngx_conf_file.c

@@ -10,6 +10,7 @@
 
 #define NGX_CONF_BUFFER  4096
 
+static ngx_int_t ngx_conf_add_dump(ngx_conf_t *cf, ngx_str_t *filename);
 static ngx_int_t ngx_conf_handler(ngx_conf_t *cf, ngx_int_t last);
 static ngx_int_t ngx_conf_read_token(ngx_conf_t *cf);
 static void ngx_conf_flush_files(ngx_cycle_t *cycle);
@@ -97,17 +98,70 @@ ngx_conf_param(ngx_conf_t *cf)
 }
 
 
+static ngx_int_t
+ngx_conf_add_dump(ngx_conf_t *cf, ngx_str_t *filename)
+{
+    off_t             size;
+    u_char           *p;
+    uint32_t          hash;
+    ngx_buf_t        *buf;
+    ngx_str_node_t   *sn;
+    ngx_conf_dump_t  *cd;
+
+    hash = ngx_crc32_long(filename->data, filename->len);
+
+    sn = ngx_str_rbtree_lookup(&cf->cycle->config_dump_rbtree, filename, hash);
+
+    if (sn) {
+        cf->conf_file->dump = NULL;
+        return NGX_OK;
+    }
+
+    p = ngx_pstrdup(cf->cycle->pool, filename);
+    if (p == NULL) {
+        return NGX_ERROR;
+    }
+
+    cd = ngx_array_push(&cf->cycle->config_dump);
+    if (cd == NULL) {
+        return NGX_ERROR;
+    }
+
+    size = ngx_file_size(&cf->conf_file->file.info);
+
+    buf = ngx_create_temp_buf(cf->cycle->pool, (size_t) size);
+    if (buf == NULL) {
+        return NGX_ERROR;
+    }
+
+    cd->name.data = p;
+    cd->name.len = filename->len;
+    cd->buffer = buf;
+
+    cf->conf_file->dump = buf;
+
+    sn = ngx_palloc(cf->temp_pool, sizeof(ngx_str_node_t));
+    if (sn == NULL) {
+        return NGX_ERROR;
+    }
+
+    sn->node.key = hash;
+    sn->str = cd->name;
+
+    ngx_rbtree_insert(&cf->cycle->config_dump_rbtree, &sn->node);
+
+    return NGX_OK;
+}
+
+
 char *
 ngx_conf_parse(ngx_conf_t *cf, ngx_str_t *filename)
 {
     char             *rv;
-    u_char           *p;
-    off_t             size;
     ngx_fd_t          fd;
     ngx_int_t         rc;
-    ngx_buf_t         buf, *tbuf;
+    ngx_buf_t         buf;
     ngx_conf_file_t  *prev, conf_file;
-    ngx_conf_dump_t  *cd;
     enum {
         parse_file = 0,
         parse_block,
@@ -167,29 +221,10 @@ ngx_conf_parse(ngx_conf_t *cf, ngx_str_t *filename)
 #endif
            )
         {
-            p = ngx_pstrdup(cf->cycle->pool, filename);
-            if (p == NULL) {
+            if (ngx_conf_add_dump(cf, filename) != NGX_OK) {
                 goto failed;
             }
 
-            size = ngx_file_size(&cf->conf_file->file.info);
-
-            tbuf = ngx_create_temp_buf(cf->cycle->pool, (size_t) size);
-            if (tbuf == NULL) {
-                goto failed;
-            }
-
-            cd = ngx_array_push(&cf->cycle->config_dump);
-            if (cd == NULL) {
-                goto failed;
-            }
-
-            cd->name.len = filename->len;
-            cd->name.data = p;
-            cd->buffer = tbuf;
-
-            cf->conf_file->dump = tbuf;
-
         } else {
             cf->conf_file->dump = NULL;
         }

src/core/ngx_cycle.c

@@ -132,6 +132,9 @@ ngx_init_cycle(ngx_cycle_t *old_cycle)
         return NULL;
     }
 
+    ngx_rbtree_init(&cycle->config_dump_rbtree, &cycle->config_dump_sentinel,
+                    ngx_str_rbtree_insert_value);
+
     if (old_cycle->open_files.part.nelts) {
         n = old_cycle->open_files.part.nelts;
         for (part = old_cycle->open_files.part.next; part; part = part->next) {

src/core/ngx_cycle.h

@@ -56,7 +56,11 @@ struct ngx_cycle_s {
 
     ngx_array_t               listening;
     ngx_array_t               paths;
+
     ngx_array_t               config_dump;
+    ngx_rbtree_t              config_dump_rbtree;
+    ngx_rbtree_node_t         config_dump_sentinel;
+
     ngx_list_t                open_files;
     ngx_list_t                shared_memory;