mirror of https://github.com/grpc/grpc-go.git
87 lines
2.5 KiB
Go
87 lines
2.5 KiB
Go
/*
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*
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* Copyright 2018 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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// The client demonstrates how to supply an OAuth2 token for every RPC.
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package main
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import (
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"context"
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"flag"
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"fmt"
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"log"
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"time"
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"golang.org/x/oauth2"
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"google.golang.org/grpc"
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"google.golang.org/grpc/credentials"
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"google.golang.org/grpc/credentials/oauth"
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"google.golang.org/grpc/examples/data"
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ecpb "google.golang.org/grpc/examples/features/proto/echo"
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)
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var addr = flag.String("addr", "localhost:50051", "the address to connect to")
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func callUnaryEcho(client ecpb.EchoClient, message string) {
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ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
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defer cancel()
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resp, err := client.UnaryEcho(ctx, &ecpb.EchoRequest{Message: message})
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if err != nil {
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log.Fatalf("client.UnaryEcho(_) = _, %v: ", err)
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}
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fmt.Println("UnaryEcho: ", resp.Message)
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}
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func main() {
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flag.Parse()
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// Set up the credentials for the connection.
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perRPC := oauth.NewOauthAccess(fetchToken())
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creds, err := credentials.NewClientTLSFromFile(data.Path("x509/ca_cert.pem"), "x.test.example.com")
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if err != nil {
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log.Fatalf("failed to load credentials: %v", err)
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}
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opts := []grpc.DialOption{
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// In addition to the following grpc.DialOption, callers may also use
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// the grpc.CallOption grpc.PerRPCCredentials with the RPC invocation
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// itself.
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// See: https://godoc.org/google.golang.org/grpc#PerRPCCredentials
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grpc.WithPerRPCCredentials(perRPC),
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// oauth.NewOauthAccess requires the configuration of transport
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// credentials.
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grpc.WithTransportCredentials(creds),
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}
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conn, err := grpc.Dial(*addr, opts...)
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if err != nil {
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log.Fatalf("did not connect: %v", err)
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}
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defer conn.Close()
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rgc := ecpb.NewEchoClient(conn)
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callUnaryEcho(rgc, "hello world")
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}
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// fetchToken simulates a token lookup and omits the details of proper token
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// acquisition. For examples of how to acquire an OAuth2 token, see:
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// https://godoc.org/golang.org/x/oauth2
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func fetchToken() *oauth2.Token {
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return &oauth2.Token{
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AccessToken: "some-secret-token",
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}
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}
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