fix:etcd prifex find error (#1507)

contrib/registry/etcd/registry.go

@@ -109,13 +109,16 @@ func (r *Registry) GetService(ctx context.Context, name string) ([]*registry.Ser
 	if err != nil {
 		return nil, err
 	}
-	items := make([]*registry.ServiceInstance, len(resp.Kvs))
+	items := make([]*registry.ServiceInstance, 0, len(resp.Kvs))
-	for i, kv := range resp.Kvs {
+	for _, kv := range resp.Kvs {
 		si, err := unmarshal(kv.Value)
 		if err != nil {
 			return nil, err
 		}
-		items[i] = si
+		if si.Name != name {
+			continue
+		}
+		items = append(items, si)
 	}
 	return items, nil
 }
@@ -123,7 +126,7 @@ func (r *Registry) GetService(ctx context.Context, name string) ([]*registry.Ser
 // Watch creates a watcher according to the service name.
 func (r *Registry) Watch(ctx context.Context, name string) (registry.Watcher, error) {
 	key := fmt.Sprintf("%s/%s", r.opts.namespace, name)
-	return newWatcher(ctx, key, r.client)
+	return newWatcher(ctx, key, name, r.client)
 }
 
 // registerWithKV create a new lease, return current leaseID

contrib/registry/etcd/watcher.go

@@ -17,14 +17,16 @@ type watcher struct {
 	watcher     clientv3.Watcher
 	kv          clientv3.KV
 	first       bool
+	serviceName string
 }
 
-func newWatcher(ctx context.Context, key string, client *clientv3.Client) (*watcher, error) {
+func newWatcher(ctx context.Context, key, name string, client *clientv3.Client) (*watcher, error) {
 	w := &watcher{
 		key:         key,
 		watcher:     clientv3.NewWatcher(client),
 		kv:          clientv3.NewKV(client),
 		first:       true,
+		serviceName: name,
 	}
 	w.ctx, w.cancel = context.WithCancel(ctx)
 	w.watchChan = w.watcher.Watch(w.ctx, key, clientv3.WithPrefix(), clientv3.WithRev(0))
@@ -60,13 +62,16 @@ func (w *watcher) getInstance() ([]*registry.ServiceInstance, error) {
 	if err != nil {
 		return nil, err
 	}
-	items := make([]*registry.ServiceInstance, len(resp.Kvs))
+	items := make([]*registry.ServiceInstance, 0, len(resp.Kvs))
-	for i, kv := range resp.Kvs {
+	for _, kv := range resp.Kvs {
 		si, err := unmarshal(kv.Value)
 		if err != nil {
 			return nil, err
 		}
-		items[i] = si
+		if si.Name != w.serviceName {
+			continue
+		}
+		items = append(items, si)
 	}
 	return items, nil
 }