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|
package gsettings
import (
"path"
"strings"
"sync"
"github.com/godbus/dbus"
)
func addMatch(bus *dbus.Conn, rule string) error {
err := bus.BusObject().Call("org.freedesktop.DBus.AddMatch", 0, rule).Err
return err
}
func initBus() (*dbus.Conn, error) {
bus, err := dbus.SessionBus()
if err != nil {
return nil, err
}
err = addMatch(bus, "type='signal',sender='ca.desrt.dconf',path='/ca/desrt/dconf/Writer/user',interface='ca.desrt.dconf.Writer',member='Notify'")
if err != nil {
return nil, err
}
return bus, nil
}
type changedCallback struct {
all bool
fns []ChangedCallbackFunc
}
type ChangedCallbackFunc func(key string)
func toPath(schemaOrPath string) string {
if schemaOrPath[0] == '/' {
// is path
if schemaOrPath[len(schemaOrPath)-1] == '/' {
schemaOrPath = schemaOrPath[:len(schemaOrPath)-1]
}
return schemaOrPath
}
// is schema id
return "/" + strings.Replace(schemaOrPath, ".", "/", -1)
}
var changedCallbackMap map[string]*changedCallback
var changedCallbackMapMu sync.RWMutex
func ConnectChanged(schemaOrPath, key string, fn ChangedCallbackFunc) {
if schemaOrPath == "" || key == "" {
return
}
var all bool
if key == "*" {
all = true
}
keyPath := toPath(schemaOrPath)
if !all {
keyPath += "/" + key
}
//log.Println("ConnectChanged", keyPath)
changedCallbackMapMu.Lock()
if changedCallbackMap == nil {
changedCallbackMap = make(map[string]*changedCallback)
}
callback, ok := changedCallbackMap[keyPath]
if ok {
if callback.all == all {
callback.fns = append(callback.fns, fn)
}
} else {
changedCallbackMap[keyPath] = &changedCallback{
all: all,
fns: []ChangedCallbackFunc{fn},
}
}
changedCallbackMapMu.Unlock()
}
var started bool
var startedMu sync.Mutex
func StartMonitor() error {
startedMu.Lock()
defer startedMu.Unlock()
if started {
return nil
}
bus, err := initBus()
if err != nil {
return err
}
signalCh := make(chan *dbus.Signal, 10)
bus.Signal(signalCh)
go func() {
for signal := range signalCh {
if signal.Name == "ca.desrt.dconf.Writer.Notify" &&
signal.Path == "/ca/desrt/dconf/Writer/user" {
if len(signal.Body) == 3 {
keyPath, ok := signal.Body[0].(string)
if !ok {
continue
}
subPathList, ok := signal.Body[1].([]string)
if !ok || len(subPathList) == 0 {
handleSignal(keyPath)
} else {
for _, subPath := range subPathList {
handleSignal(keyPath + subPath)
}
}
}
}
}
}()
started = true
return nil
}
func handleSignal(keyPath string) {
parent, key := path.Split(keyPath)
if parent == "" || key == "" {
return
}
if parent[len(parent)-1] == '/' {
parent = parent[:len(parent)-1]
}
changedCallbackMapMu.RLock()
callback := changedCallbackMap[parent]
if callback != nil && callback.all {
for _, fn := range callback.fns {
go fn(key)
}
}
callback = changedCallbackMap[keyPath]
if callback != nil && !callback.all {
for _, fn := range callback.fns {
go fn(key)
}
}
changedCallbackMapMu.RUnlock()
}
|
