/
main.go
73 lines (64 loc) · 2.25 KB
/
main.go
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/*
*
* Copyright 2020 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.
*
*/
// Binary main implements a client for Greeter service using gRPC's client-side
// support for xDS APIs.
package main
import (
"context"
"flag"
"log"
"strings"
"time"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials/insecure"
xdscreds "google.golang.org/grpc/credentials/xds"
pb "google.golang.org/grpc/examples/helloworld/helloworld"
_ "google.golang.org/grpc/xds" // To install the xds resolvers and balancers.
)
var (
target = flag.String("target", "xds:///localhost:50051", "uri of the Greeter Server, e.g. 'xds:///helloworld-service:8080'")
name = flag.String("name", "world", "name you wished to be greeted by the server")
xdsCreds = flag.Bool("xds_creds", false, "whether the server should use xDS APIs to receive security configuration")
)
func main() {
flag.Parse()
if !strings.HasPrefix(*target, "xds:///") {
log.Fatalf("-target must use a URI with scheme set to 'xds'")
}
creds := insecure.NewCredentials()
if *xdsCreds {
log.Println("Using xDS credentials...")
var err error
if creds, err = xdscreds.NewClientCredentials(xdscreds.ClientOptions{FallbackCreds: insecure.NewCredentials()}); err != nil {
log.Fatalf("failed to create client-side xDS credentials: %v", err)
}
}
conn, err := grpc.Dial(*target, grpc.WithTransportCredentials(creds))
if err != nil {
log.Fatalf("grpc.Dial(%s) failed: %v", *target, err)
}
defer conn.Close()
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
defer cancel()
c := pb.NewGreeterClient(conn)
r, err := c.SayHello(ctx, &pb.HelloRequest{Name: *name})
if err != nil {
log.Fatalf("could not greet: %v", err)
}
log.Printf("Greeting: %s", r.GetMessage())
}