Re: [PATCH] Add introspection interface to the output of introspection calls.

["RISKÓ Gergely" <gergely@risko.hu>]

Hi,

Thanks for all the comments again, here is the next round.

Diffstat says 58 insertions, 43 deletions, I think the extra 15 lines
really worth that bluez no longer treats the introspection as a very
specific interface.

BR,
Gergely

>From de18b546d3773e33c65616680a6608457804d894 Mon Sep 17 00:00:00 2001
From: Gergely Risko <gergely@risko.hu>
Date: Tue, 15 Sep 2009 15:23:24 +0300
Subject: [PATCH] gdbus: handle introspection generally in generic_message.

Previously it was a specific case, now introspection is just another
interface, which is always implemented.  It is registered/unregistered
when an object path is referenced first/last.
---
 gdbus/object.c |  101 ++++++++++++++++++++++++++++++++------------------------
 1 files changed, 58 insertions(+), 43 deletions(-)

diff --git a/gdbus/object.c b/gdbus/object.c
index 811c2e1..09e9af7 100644
--- a/gdbus/object.c
+++ b/gdbus/object.c
@@ -155,13 +155,7 @@ static void generate_introspection_xml(DBusConnection *conn,
 
 	gstr = g_string_new(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE);
 
-	g_string_append_printf(gstr,
-		"<node name=\"%s\">\n"
-		"\t<interface name=\"org.freedesktop.DBus.Introspectable\">\n"
-		"\t\t<method name=\"Introspect\">\n"
-		"\t\t\t<arg name=\"xml_data\" type=\"s\" direction=\"out\"/>\n"
-		"\t\t</method>\n"
-		"\t</interface>\n", path);
+	g_string_append_printf(gstr, "<node name=\"%s\">\n", path);
 
 	for (list = data->interfaces; list; list = list->next) {
 		struct interface_data *iface = list->data;
@@ -189,14 +183,15 @@ done:
 	data->introspect = g_string_free(gstr, FALSE);
 }
 
-static DBusHandlerResult introspect(DBusConnection *connection,
-				DBusMessage *message, struct generic_data *data)
+static DBusMessage *introspect(DBusConnection *connection,
+				DBusMessage *message, void *user_data)
 {
+	struct generic_data *data = user_data;
 	DBusMessage *reply;
 
 	if (!dbus_message_has_signature(message, DBUS_TYPE_INVALID_AS_STRING)) {
 		error("Unexpected signature to introspect call");
-		return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
+		return NULL;
 	}
 
 	if (!data->introspect)
@@ -205,16 +200,12 @@ static DBusHandlerResult introspect(DBusConnection *connection,
 
 	reply = dbus_message_new_method_return(message);
 	if (!reply)
-		return DBUS_HANDLER_RESULT_NEED_MEMORY;
+		return NULL;
 
 	dbus_message_append_args(reply, DBUS_TYPE_STRING, &data->introspect,
 					DBUS_TYPE_INVALID);
 
-	dbus_connection_send(connection, reply, NULL);
-
-	dbus_message_unref(reply);
-
-	return DBUS_HANDLER_RESULT_HANDLED;
+	return reply;
 }
 
 static void generic_unregister(DBusConnection *connection, void *user_data)
@@ -250,11 +241,6 @@ static DBusHandlerResult generic_message(DBusConnection *connection,
 	GDBusMethodTable *method;
 	const char *interface;
 
-	if (dbus_message_is_method_call(message,
-					DBUS_INTERFACE_INTROSPECTABLE,
-								"Introspect"))
-		return introspect(connection, message, data);
-
 	interface = dbus_message_get_interface(message);
 
 	iface = find_interface(data->interfaces, interface);
@@ -335,6 +321,31 @@ done:
 	g_free(parent_path);
 }
 
+static GDBusMethodTable introspect_methods[] = {
+	{ "Introspect",	"",	"s", introspect	},
+	{ }
+};
+
+static void add_interface(struct generic_data *data, const char *name,
+			     GDBusMethodTable *methods,
+			     GDBusSignalTable *signals,
+			     GDBusPropertyTable *properties,
+			     void *user_data,
+			     GDBusDestroyFunction destroy)
+{
+	struct interface_data *iface;
+
+	iface = g_new0(struct interface_data, 1);
+	iface->name = g_strdup(name);
+	iface->methods = methods;
+	iface->signals = signals;
+	iface->properties = properties;
+	iface->user_data = user_data;
+	iface->destroy = destroy;
+
+	data->interfaces = g_slist_append(data->interfaces, iface);
+}
+
 static struct generic_data *object_path_ref(DBusConnection *connection,
 							const char *path)
 {
@@ -363,9 +374,30 @@ static struct generic_data *object_path_ref(DBusConnection *connection,
 
 	invalidate_parent_data(connection, path);
 
+	add_interface(data, DBUS_INTERFACE_INTROSPECTABLE,
+			introspect_methods, NULL, NULL, data, NULL);
+
 	return data;
 }
 
+static gboolean remove_interface(struct generic_data *data, const char *name)
+{
+	struct interface_data *iface;
+
+	iface = find_interface(data->interfaces, name);
+	if (iface) {
+		data->interfaces = g_slist_remove(data->interfaces, iface);
+
+		if (iface->destroy)
+			iface->destroy(iface->user_data);
+
+		g_free(iface->name);
+		g_free(iface);
+		return TRUE;
+	} else
+		return FALSE;
+}
+
 static void object_path_unref(DBusConnection *connection, const char *path)
 {
 	struct generic_data *data = NULL;
@@ -382,6 +414,8 @@ static void object_path_unref(DBusConnection *connection, const char *path)
 	if (data->refcount > 0)
 		return;
 
+	remove_interface(data, DBUS_INTERFACE_INTROSPECTABLE);
+
 	invalidate_parent_data(connection, path);
 
 	dbus_connection_unregister_object_path(connection, path);
@@ -474,7 +508,6 @@ gboolean g_dbus_register_interface(DBusConnection *connection,
 					GDBusDestroyFunction destroy)
 {
 	struct generic_data *data;
-	struct interface_data *iface;
 
 	data = object_path_ref(connection, path);
 	if (data == NULL)
@@ -483,16 +516,8 @@ gboolean g_dbus_register_interface(DBusConnection *connection,
 	if (find_interface(data->interfaces, name))
 		return FALSE;
 
-	iface = g_new0(struct interface_data, 1);
-
-	iface->name = g_strdup(name);
-	iface->methods = methods;
-	iface->signals = signals;
-	iface->properties = properties;
-	iface->user_data = user_data;
-	iface->destroy = destroy;
-
-	data->interfaces = g_slist_append(data->interfaces, iface);
+	add_interface(data, name, methods, signals,
+			properties, user_data, destroy);
 
 	g_free(data->introspect);
 	data->introspect = NULL;
@@ -504,7 +529,6 @@ gboolean g_dbus_unregister_interface(DBusConnection *connection,
 					const char *path, const char *name)
 {
 	struct generic_data *data = NULL;
-	struct interface_data *iface;
 
 	if (!path)
 		return FALSE;
@@ -516,18 +540,9 @@ gboolean g_dbus_unregister_interface(DBusConnection *connection,
 	if (data == NULL)
 		return FALSE;
 
-	iface = find_interface(data->interfaces, name);
-	if (!iface)
+	if (remove_interface(data, name) == FALSE)
 		return FALSE;
 
-	data->interfaces = g_slist_remove(data->interfaces, iface);
-
-	if (iface->destroy)
-		iface->destroy(iface->user_data);
-
-	g_free(iface->name);
-	g_free(iface);
-
 	g_free(data->introspect);
 	data->introspect = NULL;
 
-- 
1.6.0.4