1/* 2 * 3 * Copyright 2017 gRPC authors. 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 * 17 */ 18 19// Package passthrough implements a pass-through resolver. It sends the target 20// name without scheme back to gRPC as resolved address. 21package passthrough 22 23import "google.golang.org/grpc/resolver" 24 25const scheme = "passthrough" 26 27type passthroughBuilder struct{} 28 29func (*passthroughBuilder) Build(target resolver.Target, cc resolver.ClientConn, opts resolver.BuildOption) (resolver.Resolver, error) { 30 r := &passthroughResolver{ 31 target: target, 32 cc: cc, 33 } 34 r.start() 35 return r, nil 36} 37 38func (*passthroughBuilder) Scheme() string { 39 return scheme 40} 41 42type passthroughResolver struct { 43 target resolver.Target 44 cc resolver.ClientConn 45} 46 47func (r *passthroughResolver) start() { 48 r.cc.NewAddress([]resolver.Address{{Addr: r.target.Endpoint}}) 49} 50 51func (*passthroughResolver) ResolveNow(o resolver.ResolveNowOption) {} 52 53func (*passthroughResolver) Close() {} 54 55func init() { 56 resolver.Register(&passthroughBuilder{}) 57} 58