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