342 lines
7.5 KiB
Go
342 lines
7.5 KiB
Go
package dbus
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import (
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"bytes"
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"reflect"
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"strings"
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"sync"
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)
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func newIntrospectIntf(h *defaultHandler) *exportedIntf {
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methods := make(map[string]Method)
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methods["Introspect"] = exportedMethod{
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reflect.ValueOf(func(msg Message) (string, *Error) {
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path := msg.Headers[FieldPath].value.(ObjectPath)
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return h.introspectPath(path), nil
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}),
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}
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return newExportedIntf(methods, true)
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}
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//NewDefaultHandler returns an instance of the default
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//call handler. This is useful if you want to implement only
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//one of the two handlers but not both.
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//
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// Deprecated: this is the default value, don't use it, it will be unexported.
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func NewDefaultHandler() *defaultHandler {
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h := &defaultHandler{
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objects: make(map[ObjectPath]*exportedObj),
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defaultIntf: make(map[string]*exportedIntf),
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}
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h.defaultIntf["org.freedesktop.DBus.Introspectable"] = newIntrospectIntf(h)
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return h
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}
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type defaultHandler struct {
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sync.RWMutex
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objects map[ObjectPath]*exportedObj
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defaultIntf map[string]*exportedIntf
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}
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func (h *defaultHandler) PathExists(path ObjectPath) bool {
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_, ok := h.objects[path]
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return ok
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}
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func (h *defaultHandler) introspectPath(path ObjectPath) string {
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subpath := make(map[string]struct{})
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var xml bytes.Buffer
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xml.WriteString("<node>")
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for obj := range h.objects {
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p := string(path)
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if p != "/" {
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p += "/"
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}
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if strings.HasPrefix(string(obj), p) {
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node_name := strings.Split(string(obj[len(p):]), "/")[0]
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subpath[node_name] = struct{}{}
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}
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}
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for s := range subpath {
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xml.WriteString("\n\t<node name=\"" + s + "\"/>")
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}
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xml.WriteString("\n</node>")
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return xml.String()
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}
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func (h *defaultHandler) LookupObject(path ObjectPath) (ServerObject, bool) {
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h.RLock()
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defer h.RUnlock()
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object, ok := h.objects[path]
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if ok {
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return object, ok
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}
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// If an object wasn't found for this exact path,
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// look for a matching subtree registration
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subtreeObject := newExportedObject()
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path = path[:strings.LastIndex(string(path), "/")]
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for len(path) > 0 {
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object, ok = h.objects[path]
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if ok {
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for name, iface := range object.interfaces {
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// Only include this handler if it registered for the subtree
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if iface.isFallbackInterface() {
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subtreeObject.interfaces[name] = iface
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}
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}
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break
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}
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path = path[:strings.LastIndex(string(path), "/")]
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}
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for name, intf := range h.defaultIntf {
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if _, exists := subtreeObject.interfaces[name]; exists {
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continue
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}
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subtreeObject.interfaces[name] = intf
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}
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return subtreeObject, true
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}
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func (h *defaultHandler) AddObject(path ObjectPath, object *exportedObj) {
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h.Lock()
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h.objects[path] = object
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h.Unlock()
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}
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func (h *defaultHandler) DeleteObject(path ObjectPath) {
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h.Lock()
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delete(h.objects, path)
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h.Unlock()
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}
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type exportedMethod struct {
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reflect.Value
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}
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func (m exportedMethod) Call(args ...interface{}) ([]interface{}, error) {
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t := m.Type()
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params := make([]reflect.Value, len(args))
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for i := 0; i < len(args); i++ {
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params[i] = reflect.ValueOf(args[i]).Elem()
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}
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ret := m.Value.Call(params)
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var err error
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nilErr := false // The reflection will find almost-nils, let's only pass back clean ones!
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if t.NumOut() > 0 {
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if e, ok := ret[t.NumOut()-1].Interface().(*Error); ok { // godbus *Error
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nilErr = ret[t.NumOut()-1].IsNil()
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ret = ret[:t.NumOut()-1]
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err = e
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} else if ret[t.NumOut()-1].Type().Implements(errType) { // Go error
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i := ret[t.NumOut()-1].Interface()
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if i == nil {
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nilErr = ret[t.NumOut()-1].IsNil()
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} else {
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err = i.(error)
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}
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ret = ret[:t.NumOut()-1]
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}
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}
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out := make([]interface{}, len(ret))
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for i, val := range ret {
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out[i] = val.Interface()
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}
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if nilErr || err == nil {
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//concrete type to interface nil is a special case
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return out, nil
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}
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return out, err
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}
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func (m exportedMethod) NumArguments() int {
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return m.Value.Type().NumIn()
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}
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func (m exportedMethod) ArgumentValue(i int) interface{} {
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return reflect.Zero(m.Type().In(i)).Interface()
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}
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func (m exportedMethod) NumReturns() int {
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return m.Value.Type().NumOut()
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}
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func (m exportedMethod) ReturnValue(i int) interface{} {
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return reflect.Zero(m.Type().Out(i)).Interface()
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}
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func newExportedObject() *exportedObj {
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return &exportedObj{
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interfaces: make(map[string]*exportedIntf),
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}
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}
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type exportedObj struct {
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mu sync.RWMutex
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interfaces map[string]*exportedIntf
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}
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func (obj *exportedObj) LookupInterface(name string) (Interface, bool) {
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if name == "" {
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return obj, true
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}
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obj.mu.RLock()
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defer obj.mu.RUnlock()
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intf, exists := obj.interfaces[name]
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return intf, exists
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}
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func (obj *exportedObj) AddInterface(name string, iface *exportedIntf) {
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obj.mu.Lock()
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defer obj.mu.Unlock()
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obj.interfaces[name] = iface
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}
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func (obj *exportedObj) DeleteInterface(name string) {
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obj.mu.Lock()
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defer obj.mu.Unlock()
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delete(obj.interfaces, name)
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}
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func (obj *exportedObj) LookupMethod(name string) (Method, bool) {
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obj.mu.RLock()
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defer obj.mu.RUnlock()
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for _, intf := range obj.interfaces {
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method, exists := intf.LookupMethod(name)
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if exists {
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return method, exists
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}
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}
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return nil, false
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}
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func (obj *exportedObj) isFallbackInterface() bool {
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return false
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}
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func newExportedIntf(methods map[string]Method, includeSubtree bool) *exportedIntf {
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return &exportedIntf{
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methods: methods,
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includeSubtree: includeSubtree,
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}
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}
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type exportedIntf struct {
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methods map[string]Method
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// Whether or not this export is for the entire subtree
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includeSubtree bool
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}
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func (obj *exportedIntf) LookupMethod(name string) (Method, bool) {
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out, exists := obj.methods[name]
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return out, exists
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}
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func (obj *exportedIntf) isFallbackInterface() bool {
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return obj.includeSubtree
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}
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//NewDefaultSignalHandler returns an instance of the default
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//signal handler. This is useful if you want to implement only
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//one of the two handlers but not both.
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//
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// Deprecated: this is the default value, don't use it, it will be unexported.
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func NewDefaultSignalHandler() *defaultSignalHandler {
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return &defaultSignalHandler{}
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}
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type defaultSignalHandler struct {
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mu sync.RWMutex
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closed bool
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signals []*signalChannelData
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}
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func (sh *defaultSignalHandler) DeliverSignal(intf, name string, signal *Signal) {
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sh.mu.RLock()
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defer sh.mu.RUnlock()
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if sh.closed {
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return
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}
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for _, scd := range sh.signals {
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scd.deliver(signal)
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}
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}
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func (sh *defaultSignalHandler) Terminate() {
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sh.mu.Lock()
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defer sh.mu.Unlock()
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if sh.closed {
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return
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}
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for _, scd := range sh.signals {
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scd.close()
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close(scd.ch)
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}
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sh.closed = true
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sh.signals = nil
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}
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func (sh *defaultSignalHandler) AddSignal(ch chan<- *Signal) {
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sh.mu.Lock()
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defer sh.mu.Unlock()
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if sh.closed {
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return
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}
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sh.signals = append(sh.signals, &signalChannelData{
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ch: ch,
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done: make(chan struct{}),
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})
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}
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func (sh *defaultSignalHandler) RemoveSignal(ch chan<- *Signal) {
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sh.mu.Lock()
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defer sh.mu.Unlock()
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if sh.closed {
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return
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}
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for i := len(sh.signals) - 1; i >= 0; i-- {
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if ch == sh.signals[i].ch {
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sh.signals[i].close()
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copy(sh.signals[i:], sh.signals[i+1:])
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sh.signals[len(sh.signals)-1] = nil
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sh.signals = sh.signals[:len(sh.signals)-1]
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}
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}
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}
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type signalChannelData struct {
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wg sync.WaitGroup
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ch chan<- *Signal
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done chan struct{}
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}
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func (scd *signalChannelData) deliver(signal *Signal) {
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select {
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case scd.ch <- signal:
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case <-scd.done:
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return
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default:
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scd.wg.Add(1)
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go scd.deferredDeliver(signal)
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}
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}
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func (scd *signalChannelData) deferredDeliver(signal *Signal) {
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select {
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case scd.ch <- signal:
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case <-scd.done:
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}
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scd.wg.Done()
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}
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func (scd *signalChannelData) close() {
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close(scd.done)
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scd.wg.Wait() // wait until all spawned goroutines return
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}
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