// NewDBusProxy creates a new dbus proxy.
func NewDBusProxy(conn *dbus.Conn, dest string, objPath string, iface string, flags dbus.Flags) (*DBusProxy, error) {
if conn == nil {
return nil, ErrorProxyNilConnection
}
if dest == "" {
return nil, ErrorProxyEmptyDestination
}
if objPath == "" {
return nil, ErrorProxyEmptyObjectPath
}
if !dbus.ObjectPath(objPath).IsValid() {
return nil, ErrorProxyInvalidObjectPath
}
if iface == "" {
return nil, ErrorProxyEmptyInterface
}
obj := conn.Object(dest, dbus.ObjectPath(objPath))
proxy := &DBusProxy{
conn: conn,
obj: obj,
dest: dest,
objPath: objPath,
iface: iface,
introspectorIface: "org.freedesktop.DBus.Introspectable",
flags: flags,
sigChanMap: map[string][]Signal{},
}
runtime.SetFinalizer(proxy, func(proxy *DBusProxy) {
proxy.finalize()
})
return proxy, nil
}
func (manager *MonitorManager) Watch(fileURI string) (string, dbus.ObjectPath, string, error) {
watcherID := atomic.AddUint32(&_WatcherCounter, 1)
watcher, err := NewWatcher(watcherID, fileURI)
if err != nil {
return "", dbus.ObjectPath("/"), "", err
}
if err := dbus.InstallOnSession(watcher); err != nil {
watcher.finalize()
return "", dbus.ObjectPath("/"), "", err
}
manager.watchers[WatcherID(watcherID)] = watcher
dbusInfo := watcher.GetDBusInfo()
return dbusInfo.Dest, dbus.ObjectPath(dbusInfo.ObjectPath), dbusInfo.Interface, nil
}
func (manager *MonitorManager) Monitor(fileURI string, flags uint32) (string, dbus.ObjectPath, string, error) {
monitorID := atomic.AddUint32(&_MonitorCounter, 1)
monitor, err := NewMonitor(monitorID, fileURI, gio.FileMonitorFlags(flags))
if monitor == nil {
return "", dbus.ObjectPath("/"), "", err
}
if err := dbus.InstallOnSession(monitor); err != nil {
Log.Error("Install Monitor to Session Bus failed:", err)
monitor.finalize()
return "", dbus.ObjectPath("/"), "", err
}
manager.monitors[MonitorID(monitorID)] = monitor
dbusInfo := monitor.GetDBusInfo()
return dbusInfo.Dest, dbus.ObjectPath(dbusInfo.ObjectPath), dbusInfo.Interface, nil
}
// Because empty object path is invalid, so JobObjectPath is used as default value.
// So empty interface means install failed.
func installJob(job dbus.DBusObject) (string, dbus.ObjectPath, string, error) {
dest := ""
objPath := dbus.ObjectPath(d.JobObjectPath)
iface := ""
if job == nil {
Log.Warning("cannot install a nil object on dbus.")
return dest, objPath, iface, errors.New("cannot install a nil object on dbus.")
}
err := dbus.InstallOnSession(job)
if err != nil {
Log.Warning("install dbus on session bus failed:", err)
return dest, objPath, iface, err
}
dbusInfo := job.GetDBusInfo()
return dbusInfo.Dest, dbus.ObjectPath(dbusInfo.ObjectPath), dbusInfo.Interface, nil
}
// create a new operation from fn and install it to session bus.
// NB: using closure and anonymous function is ok,
// but variable-length argument list is much more safer and much more portable.
func newOperationJob(paths []string, fn func([]string, ...interface{}) dbus.DBusObject, args ...interface{}) (string, dbus.ObjectPath, string, error) {
objPath := dbus.ObjectPath(d.JobObjectPath)
iface := ""
srcURLs := make([]string, len(paths))
for i, path := range paths {
srcURL, err := pathToURL(path)
if err != nil {
Log.Error("convert path to URL failed:", err)
return "", objPath, iface, err // maybe continue is a better choice.
}
srcURLs[i] = srcURL.String()
}
return installJob(fn(srcURLs, args...))
}
func (proxy *DBusProxy) Subscribe(sigName string, f interface{}) func() {
sig := proxy.createSignalChan(sigName)
rule := proxy.buildRule(sigName)
proxy.conn.BusObject().Call("org.freedesktop.DBus.AddMatch", 0, rule)
go func() {
fn := reflect.ValueOf(f)
for v := range sig.Chan {
if v.Name != SignalName(proxy.iface, sigName) || v.Path != dbus.ObjectPath(proxy.objPath) {
continue
}
l := len(v.Body)
args := make([]reflect.Value, l)
for i, v := range v.Body {
args[i] = reflect.ValueOf(v)
}
fn.Call(args)
}
}()
return func() {
proxy.removeSignalChan(sig)
}
}
