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