1 /* 2 * Copyright 2021 gRPC authors. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 // Package xds contains methods to Get/Set handshake cluster names. It is separated 18 // out from the top level /internal package to avoid circular dependencies. 19 package xds 20 21 import ( 22 "google.golang.org/grpc/attributes" 23 "google.golang.org/grpc/resolver" 24 ) 25 26 // handshakeClusterNameKey is the type used as the key to store cluster name in 27 // the Attributes field of resolver.Address. 28 type handshakeClusterNameKey struct{} 29 30 // SetXDSHandshakeClusterName returns a copy of addr in which the Attributes field 31 // is updated with the cluster name. 32 func SetXDSHandshakeClusterName(addr resolver.Address, clusterName string) resolver.Address { 33 addr.Attributes = addr.Attributes.WithValue(handshakeClusterNameKey{}, clusterName) 34 return addr 35 } 36 37 // GetXDSHandshakeClusterName returns cluster name stored in attr. 38 func GetXDSHandshakeClusterName(attr *attributes.Attributes) (string, bool) { 39 v := attr.Value(handshakeClusterNameKey{}) 40 name, ok := v.(string) 41 return name, ok 42 } 43