[core] (const buffer *) for con->server_name

use con->server_name_buf when modules set server_name (e.g from db)

src/base.h

@@ -264,8 +264,9 @@ struct connection {
 	specific_config conf;        /* global connection specific config */
 	cond_cache_t *cond_cache;
 
-	buffer *server_name;
+	const buffer *server_name;
 	buffer *proto;
+	buffer *server_name_buf;
 
 	/* error-handler */
 	int error_handler_saved_status;

src/configfile.c

@@ -695,7 +695,6 @@ int config_setup_connection(server *srv, connection *con) {
 	PATCH(global_bytes_per_second_cnt);
 
 	con->conf.global_bytes_per_second_cnt_ptr = &s->global_bytes_per_second_cnt;
-	buffer_copy_buffer(con->server_name, s->server_name);
 
 	PATCH(log_request_header);
 	PATCH(log_response_header);
@@ -715,6 +714,8 @@ int config_setup_connection(server *srv, connection *con) {
 	PATCH(etag_use_mtime);
 	PATCH(etag_use_size);
 
+	con->server_name = s->server_name;
+
 	return 0;
 }
 
@@ -768,7 +769,7 @@ int config_patch_connection(server *srv, connection *con) {
 			} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("server.follow-symlink"))) {
 				PATCH(follow_symlink);
 			} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("server.name"))) {
-				buffer_copy_buffer(con->server_name, s->server_name);
+				PATCH(server_name);
 			} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("server.tag"))) {
 				PATCH(server_tag);
 			} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("server.stream-request-body"))) {

src/connections.c

@@ -566,7 +566,7 @@ static connection *connection_init(server *srv) {
 	CLEAN(physical.rel_path);
 	CLEAN(physical.etag);
 
-	CLEAN(server_name);
+	CLEAN(server_name_buf);
 	CLEAN(proto);
 	CLEAN(dst_addr_buf);
 
@@ -626,7 +626,7 @@ void connections_free(server *srv) {
 		CLEAN(physical.etag);
 		CLEAN(physical.rel_path);
 
-		CLEAN(server_name);
+		CLEAN(server_name_buf);
 		CLEAN(proto);
 		CLEAN(dst_addr_buf);
 #undef CLEAN
@@ -672,7 +672,7 @@ static int connection_reset(server *srv, connection *con) {
 	buffer_clear(con->uri.scheme);
 	/*buffer_clear(con->proto);*//* set to default in connection_accepted() */
 	/*buffer_clear(con->uri.authority);*/
-	buffer_clear(con->server_name);
+	/*buffer_clear(con->server_name_buf);*//* reset when used */
 
 	con->request.http_host = NULL;
 	con->request.content_length = 0;

src/mod_mysql_vhost.c

@@ -348,7 +348,8 @@ CONNECTION_FUNC(mod_mysql_vhost_handle_docroot) {
 
 	/* fix virtual server and docroot */
 GO_ON:
-	buffer_copy_buffer(con->server_name, c->server_name);
+	con->server_name = con->server_name_buf;
+	buffer_copy_buffer(con->server_name_buf, c->server_name);
 	buffer_copy_buffer(con->physical.doc_root, c->document_root);
 
 	return HANDLER_GO_ON;

src/mod_simple_vhost.c

@@ -239,7 +239,8 @@ static handler_t mod_simple_vhost_docroot(server *srv, connection *con, void *p_
 	    !buffer_string_is_empty(con->uri.authority) &&
 	    buffer_is_equal(p->conf.docroot_cache_key, con->uri.authority)) {
 		/* cache hit */
-		buffer_copy_buffer(con->server_name,       p->conf.docroot_cache_servername);
+		con->server_name = con->server_name_buf;
+		buffer_copy_buffer(con->server_name_buf,   p->conf.docroot_cache_servername);
 		buffer_copy_buffer(con->physical.doc_root, p->conf.docroot_cache_value);
 	} else {
 		/* build document-root */
@@ -250,7 +251,8 @@ static handler_t mod_simple_vhost_docroot(server *srv, connection *con, void *p_
 					   p->doc_root,
 					   p->conf.default_host)) {
 				/* default host worked */
-				buffer_copy_buffer(con->server_name, p->conf.default_host);
+				con->server_name = con->server_name_buf;
+				buffer_copy_buffer(con->server_name_buf, p->conf.default_host);
 				buffer_copy_buffer(con->physical.doc_root, p->doc_root);
 				/* do not cache default host */
 			}
@@ -258,7 +260,8 @@ static handler_t mod_simple_vhost_docroot(server *srv, connection *con, void *p_
 		}
 
 		/* found host */
-		buffer_copy_buffer(con->server_name, con->uri.authority);
+		con->server_name = con->server_name_buf;
+		buffer_copy_buffer(con->server_name_buf, con->uri.authority);
 		buffer_copy_buffer(con->physical.doc_root, p->doc_root);
 
 		/* copy to cache */

src/mod_vhostdb.c

@@ -166,7 +166,8 @@ static handler_t mod_vhostdb_error_500 (connection *con)
 static handler_t mod_vhostdb_found (connection *con, vhostdb_entry *ve)
 {
     /* fix virtual server and docroot */
-    buffer_copy_buffer(con->server_name, ve->server_name);
+    con->server_name = con->server_name_buf;
+    buffer_copy_buffer(con->server_name_buf, ve->server_name);
     buffer_copy_buffer(con->physical.doc_root, ve->document_root);
     return HANDLER_GO_ON;
 }

src/response.c

@@ -626,7 +626,7 @@ handler_t http_response_prepare(server *srv, connection *con) {
 
 		/* the docroot plugins might set the servername, if they don't we take http-host */
 		if (buffer_string_is_empty(con->server_name)) {
-			buffer_copy_buffer(con->server_name, con->uri.authority);
+			con->server_name = con->uri.authority;
 		}
 
 		/**