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package dbusutil
import (
"errors"
"reflect"
"sync"
"unsafe"
"github.com/godbus/dbus"
)
type Implementer interface {
GetInterfaceName() string
}
func getImplementerPointer(impl Implementer) unsafe.Pointer {
return unsafe.Pointer(reflect.ValueOf(impl).Pointer())
}
type implementer struct {
core Implementer
props map[string]*fieldProp
propChanges propChanges
}
func (impl *implementer) getStatic(s *Service) *implementerStatic {
return s.getImplementerStatic(impl.core)
}
func (impl *implementer) getInterfaceName() string {
return impl.core.GetInterfaceName()
}
func newImplementer(core Implementer, service *Service, path dbus.ObjectPath) (*implementer, error) {
impl := &implementer{
core: core,
}
structValue, ok := getStructValue(core)
if !ok {
return nil, errors.New("v is not a struct pointer")
}
ifcName := core.GetInterfaceName()
service.mu.Lock()
implStatic, ok := service.implStaticMap[ifcName]
if !ok {
implStatic = newImplementerStatic(core, structValue)
service.implStaticMap[ifcName] = implStatic
}
service.mu.Unlock()
impl.props = getFieldPropMap(impl, implStatic, structValue, service, path)
return impl, nil
}
type propChanges struct {
mu sync.Mutex
modeMu sync.Mutex
delayMode bool
items []implPropChanged
}
type implPropChanged struct {
name string
value interface{}
}
func (impl *implementer) setWriteCallback(propertyName string, cb PropertyWriteCallback) error {
p := impl.props[propertyName]
if p == nil {
return errors.New("property not found")
}
p.setWriteCallback(cb)
return nil
}
func (impl *implementer) setReadCallback(propertyName string, cb PropertyReadCallback) error {
p := impl.props[propertyName]
if p == nil {
return errors.New("property not found")
}
p.setReadCallback(cb)
return nil
}
func (impl *implementer) connectChanged(propertyName string, cb PropertyChangedCallback) error {
p := impl.props[propertyName]
if p == nil {
return errors.New("property not found")
}
p.connectChanged(cb)
return nil
}
func (impl *implementer) notifyChanged(s *Service, path dbus.ObjectPath,
p *fieldProp, propStatic *fieldPropStatic, value interface{}) {
interfaceName := impl.core.GetInterfaceName()
propChanged := newPropertyChanged(path, interfaceName, propStatic.name, value)
p.notifyChanged(propChanged)
_ = emitPropertiesChanged(s.conn, path, interfaceName,
propStatic.name, value, propStatic.emit)
}
func (impl *implementer) delayEmitPropChanged() {
// start delay mode
impl.propChanges.modeMu.Lock()
impl.propChanges.mu.Lock()
impl.propChanges.delayMode = true
impl.propChanges.mu.Unlock()
}
func (impl *implementer) emitPropChanged(s *Service, path dbus.ObjectPath,
propName string, value interface{}) (err error) {
impl.propChanges.mu.Lock()
defer impl.propChanges.mu.Unlock()
if impl.propChanges.delayMode {
// in delay mode
items := impl.propChanges.items
found := false
for i := 0; i < len(items); i++ {
item := &items[i]
if item.name == propName {
item.value = value
found = true
break
}
}
if !found {
impl.propChanges.items = append(items, implPropChanged{
name: propName,
value: value,
})
}
} else {
// not in delay mode
implStatic := impl.getStatic(s)
propStatic := implStatic.props[propName]
err = emitPropertiesChanged(s.conn, path, impl.getInterfaceName(),
propName, value, propStatic.emit)
}
return
}
func (impl *implementer) stopDelayEmitPropChanged(s *Service, path dbus.ObjectPath) (err error) {
impl.propChanges.mu.Lock()
var changedProps map[string]dbus.Variant
var invalidatedProps []string
items := impl.propChanges.items
if len(items) > 0 {
changedProps = make(map[string]dbus.Variant)
}
implStatic := impl.getStatic(s)
for _, change := range items {
p := implStatic.props[change.name]
switch p.emit {
case emitFalse:
// do nothing
case emitInvalidates:
invalidatedProps = append(invalidatedProps, change.name)
case emitTrue:
changedProps[change.name] = dbus.MakeVariant(change.value)
}
}
const signalName = orgFreedesktopDBus + ".Properties.PropertiesChanged"
if len(changedProps)+len(invalidatedProps) > 0 {
err = s.conn.Emit(path, signalName, impl.core.GetInterfaceName(),
changedProps, invalidatedProps)
}
impl.propChanges.items = nil
impl.propChanges.delayMode = false
impl.propChanges.mu.Unlock()
// end delay mode
impl.propChanges.modeMu.Unlock()
return
}
|
