1/* 2 * 3 * Copyright 2014 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 peer defines various peer information associated with RPCs and 20// corresponding utils. 21package peer 22 23import ( 24 "net" 25 26 "golang.org/x/net/context" 27 "google.golang.org/grpc/credentials" 28) 29 30// Peer contains the information of the peer for an RPC, such as the address 31// and authentication information. 32type Peer struct { 33 // Addr is the peer address. 34 Addr net.Addr 35 // AuthInfo is the authentication information of the transport. 36 // It is nil if there is no transport security being used. 37 AuthInfo credentials.AuthInfo 38} 39 40type peerKey struct{} 41 42// NewContext creates a new context with peer information attached. 43func NewContext(ctx context.Context, p *Peer) context.Context { 44 return context.WithValue(ctx, peerKey{}, p) 45} 46 47// FromContext returns the peer information in ctx if it exists. 48func FromContext(ctx context.Context) (p *Peer, ok bool) { 49 p, ok = ctx.Value(peerKey{}).(*Peer) 50 return 51} 52