xds Balancer: implementation (grpc#2614)

balancer/xds/edsbalancer/edsbalancer.go

@@ -0,0 +1,58 @@
+/*
+ *
+ * Copyright 2019 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package edsbalancer
+
+// TODO: this file is used as a place holder. It should be deleted after edsbalancer implementation
+// is merged.
+
+import (
+	"encoding/json"
+
+	v2 "github.com/envoyproxy/go-control-plane/envoy/api/v2"
+	"google.golang.org/grpc/balancer"
+	"google.golang.org/grpc/connectivity"
+	"google.golang.org/grpc/resolver"
+)
+
+type dummyEdsBalancer struct{}
+
+func (d *dummyEdsBalancer) HandleSubConnStateChange(sc balancer.SubConn, state connectivity.State) {
+	panic("implement me")
+}
+
+func (d *dummyEdsBalancer) HandleResolvedAddrs([]resolver.Address, error) {
+	panic("implement me")
+}
+
+func (d *dummyEdsBalancer) Close() {
+	panic("implement me")
+}
+
+func (d *dummyEdsBalancer) HandleEDSResponse(edsResp *v2.ClusterLoadAssignment) {
+	panic("implement me")
+}
+
+func (d *dummyEdsBalancer) HandleChildPolicy(name string, config json.RawMessage) {
+	panic("implement me")
+}
+
+// NewXDSBalancer creates an edsBalancer
+func NewXDSBalancer(cc balancer.ClientConn) interface{} {
+	return &dummyEdsBalancer{}
+}