Move D-Bus mainloop integration into libgdbus

2 files changed, 300 insertions, 1 deletions

diff --git a/gdbus/gdbus.h b/gdbus/gdbus.h
index 71377516..d749d5e2 100644
--- a/gdbus/gdbus.h
+++ b/gdbus/gdbus.h
@@ -20,3 +20,24 @@
  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  *
  */
+
+#ifndef __GDBUS_H
+#define __GDBUS_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <dbus/dbus.h>
+#include <glib.h>
+
+void setup_dbus_with_main_loop(DBusConnection *conn);
+
+DBusConnection *dbus_bus_system_setup_with_main_loop(const char *name,
+				void (*disconnect_cb)(void *), void *user_data);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __GDBUS_H */
diff --git a/gdbus/mainloop.c b/gdbus/mainloop.c
index f08299f0..e8e7e0af 100644
--- a/gdbus/mainloop.c
+++ b/gdbus/mainloop.c
@@ -25,8 +25,9 @@
 #include <config.h>
 #endif
 
-#include <glib.h>
+#include <stdint.h>
 
+#include <glib.h>
 #include <dbus/dbus.h>
 
 #ifdef NEED_DBUS_WATCH_GET_UNIX_FD
@@ -38,3 +39,280 @@
 #endif
 
 #include "gdbus.h"
+
+#define DISPATCH_TIMEOUT  0
+
+#define info(fmt...)
+#define error(fmt...)
+#define debug(fmt...)
+
+#ifndef HAVE_DBUS_GLIB
+typedef struct {
+	uint32_t id;
+	DBusTimeout *timeout;
+} timeout_handler_t;
+
+struct watch_info {
+	guint watch_id;
+	GIOChannel *io;
+	DBusConnection *conn;
+};
+
+struct server_info {
+	guint watch_id;
+	GIOChannel *io;
+	DBusServer *server;
+};
+#endif
+
+struct disconnect_data {
+	void (*disconnect_cb)(void *);
+	void *user_data;
+};
+
+static DBusHandlerResult disconnect_filter(DBusConnection *conn,
+						DBusMessage *msg, void *data)
+{
+	struct disconnect_data *dc_data = data;
+
+	if (dbus_message_is_signal(msg,
+			DBUS_INTERFACE_LOCAL, "Disconnected") == TRUE) {
+		error("Got disconnected from the system message bus");
+		dbus_connection_unref(conn);
+		dc_data->disconnect_cb(dc_data->user_data);
+	}
+
+	return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
+}
+
+#ifndef HAVE_DBUS_GLIB
+static gboolean message_dispatch_cb(void *data)
+{
+	DBusConnection *connection = data;
+
+	dbus_connection_ref(connection);
+
+	/* Dispatch messages */
+	while (dbus_connection_dispatch(connection) == DBUS_DISPATCH_DATA_REMAINS);
+
+	dbus_connection_unref(connection);
+
+	return FALSE;
+}
+
+static gboolean watch_func(GIOChannel *chan, GIOCondition cond, gpointer data)
+{
+	DBusWatch *watch = data;
+	struct watch_info *info = dbus_watch_get_data(watch);
+	int flags = 0;
+
+	if (cond & G_IO_IN)  flags |= DBUS_WATCH_READABLE;
+	if (cond & G_IO_OUT) flags |= DBUS_WATCH_WRITABLE;
+	if (cond & G_IO_HUP) flags |= DBUS_WATCH_HANGUP;
+	if (cond & G_IO_ERR) flags |= DBUS_WATCH_ERROR;
+
+	dbus_watch_handle(watch, flags);
+
+	if (dbus_connection_get_dispatch_status(info->conn) == DBUS_DISPATCH_DATA_REMAINS)
+		g_timeout_add(DISPATCH_TIMEOUT, message_dispatch_cb, info->conn);
+
+	return TRUE;
+}
+
+static dbus_bool_t add_watch(DBusWatch *watch, void *data)
+{
+	GIOCondition cond = G_IO_HUP | G_IO_ERR;
+	DBusConnection *conn = data;
+	struct watch_info *info;
+	int fd, flags;
+
+	if (!dbus_watch_get_enabled(watch))
+		return TRUE;
+
+	info = g_new(struct watch_info, 1);
+
+	fd = dbus_watch_get_unix_fd(watch);
+	info->io = g_io_channel_unix_new(fd);
+	info->conn = dbus_connection_ref(conn);
+
+	dbus_watch_set_data(watch, info, NULL);
+
+	flags = dbus_watch_get_flags(watch);
+
+	if (flags & DBUS_WATCH_READABLE) cond |= G_IO_IN;
+	if (flags & DBUS_WATCH_WRITABLE) cond |= G_IO_OUT;
+
+	info->watch_id = g_io_add_watch(info->io, cond, watch_func, watch);
+
+	return TRUE;
+}
+
+static void remove_watch(DBusWatch *watch, void *data)
+{
+	struct watch_info *info = dbus_watch_get_data(watch);
+
+	dbus_watch_set_data(watch, NULL, NULL);
+
+	if (info) {
+		g_source_remove(info->watch_id);
+		g_io_channel_unref(info->io);
+		dbus_connection_unref(info->conn);
+		g_free(info);
+	}
+}
+
+static void watch_toggled(DBusWatch *watch, void *data)
+{
+	/* Because we just exit on OOM, enable/disable is
+	 * no different from add/remove */
+	if (dbus_watch_get_enabled(watch))
+		add_watch(watch, data);
+	else
+		remove_watch(watch, data);
+}
+
+static gboolean timeout_handler_dispatch(gpointer data)
+{
+	timeout_handler_t *handler = data;
+
+	/* if not enabled should not be polled by the main loop */
+	if (dbus_timeout_get_enabled(handler->timeout) != TRUE)
+		return FALSE;
+
+	dbus_timeout_handle(handler->timeout);
+
+	return FALSE;
+}
+
+static void timeout_handler_free(void *data)
+{
+	timeout_handler_t *handler = data;
+	if (!handler)
+		return;
+
+	g_source_remove(handler->id);
+	g_free(handler);
+}
+
+static dbus_bool_t add_timeout(DBusTimeout *timeout, void *data)
+{
+	timeout_handler_t *handler;
+
+	if (!dbus_timeout_get_enabled(timeout))
+		return TRUE;
+
+	handler = g_new0(timeout_handler_t, 1);
+
+	handler->timeout = timeout;
+	handler->id = g_timeout_add(dbus_timeout_get_interval(timeout),
+					timeout_handler_dispatch, handler);
+
+	dbus_timeout_set_data(timeout, handler, timeout_handler_free);
+
+	return TRUE;
+}
+
+static void remove_timeout(DBusTimeout *timeout, void *data)
+{
+}
+
+static void timeout_toggled(DBusTimeout *timeout, void *data)
+{
+	if (dbus_timeout_get_enabled(timeout))
+		add_timeout(timeout, data);
+	else
+		remove_timeout(timeout, data);
+}
+
+static void dispatch_status_cb(DBusConnection *conn,
+				DBusDispatchStatus new_status, void *data)
+{
+	if (!dbus_connection_get_is_connected(conn))
+		return;
+
+	if (new_status == DBUS_DISPATCH_DATA_REMAINS)
+		g_timeout_add(DISPATCH_TIMEOUT, message_dispatch_cb, data);
+}
+#endif
+
+void setup_dbus_with_main_loop(DBusConnection *conn)
+{
+#ifdef HAVE_DBUS_GLIB
+	debug("Using D-Bus GLib connection setup");
+
+	dbus_connection_setup_with_g_main(conn, NULL);
+#else
+	dbus_connection_set_watch_functions(conn, add_watch, remove_watch,
+						watch_toggled, conn, NULL);
+
+	dbus_connection_set_timeout_functions(conn, add_timeout, remove_timeout,
+						timeout_toggled, conn, NULL);
+
+	dbus_connection_set_dispatch_status_function(conn, dispatch_status_cb,
+								conn, NULL);
+#endif
+}
+
+static DBusConnection *init_dbus(const char *name,
+				void (*disconnect_cb)(void *), void *user_data)
+{
+	struct disconnect_data *dc_data;
+	DBusConnection *conn;
+	DBusError err;
+
+	dbus_error_init(&err);
+
+	conn = dbus_bus_get(DBUS_BUS_SYSTEM, &err);
+
+	if (dbus_error_is_set(&err)) {
+		error("Can't connect to system message bus: %s", err.message);
+		dbus_error_free(&err);
+		return NULL;
+	}
+
+	setup_dbus_with_main_loop(conn);
+
+	if (name) {
+		dbus_error_init(&err);
+
+		if (dbus_bus_request_name(conn, name, 0, &err) !=
+				DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER ) {
+			error("Could not become the primary owner of %s", name);
+			dbus_connection_unref(conn);
+			return NULL;
+		}
+
+		if (dbus_error_is_set(&err)) {
+			error("Can't get bus name %s: %s", name, err.message);
+			dbus_error_free(&err);
+			dbus_connection_unref(conn);
+			return NULL;
+		}
+	}
+
+	if (!disconnect_cb)
+		return conn;
+
+	dc_data = g_new(struct disconnect_data, 1);
+
+	dc_data->disconnect_cb = disconnect_cb;
+	dc_data->user_data = user_data;
+
+	dbus_connection_set_exit_on_disconnect(conn, FALSE);
+
+	if (!dbus_connection_add_filter(conn, disconnect_filter,
+				dc_data, g_free)) {
+		error("Can't add D-Bus disconnect filter");
+		g_free(dc_data);
+		dbus_connection_unref(conn);
+		return NULL;
+	}
+
+	return conn;
+}
+
+DBusConnection *dbus_bus_system_setup_with_main_loop(const char *name,
+				void (*disconnect_cb)(void *), void *user_data)
+{
+	return init_dbus(name, disconnect_cb, user_data);
+}