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 18 package xdsclient 19 20 import "google.golang.org/grpc/resolver" 21 22 type clientKeyType string 23 24 const clientKey = clientKeyType("grpc.xds.internal.client.Client") 25 26 // FromResolverState returns the Client from state, or nil if not present. 27 func FromResolverState(state resolver.State) XDSClient { 28 cs, _ := state.Attributes.Value(clientKey).(XDSClient) 29 return cs 30 } 31 32 // SetClient sets c in state and returns the new state. 33 func SetClient(state resolver.State, c XDSClient) resolver.State { 34 state.Attributes = state.Attributes.WithValue(clientKey, c) 35 return state 36 } 37