main.go

/*
 *
 * 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.
 *
 */

package main

import (
	"log"
	"os"
	"time"

	"golang.org/x/net/context"
	epb "google.golang.org/genproto/googleapis/rpc/errdetails"
	"google.golang.org/grpc"
	pb "google.golang.org/grpc/examples/helloworld/helloworld"
	"google.golang.org/grpc/status"
)

func main() {
	// Set up a connection to the server.
	conn, err := grpc.Dial("localhost:50051", grpc.WithInsecure())
	if err != nil {
		log.Fatalf("did not connect: %v", err)
	}
	defer func() {
		if e := conn.Close(); e != nil {
			log.Printf("failed to close connection: %s", e)
		}
	}()
	c := pb.NewGreeterClient(conn)

	ctx, cancel := context.WithTimeout(context.Background(), time.Second)
	defer cancel()
	r, err := c.SayHello(ctx, &pb.HelloRequest{Name: "world"})
	if err != nil {
		s := status.Convert(err)
		for _, d := range s.Details() {
			switch info := d.(type) {
			case *epb.QuotaFailure:
				log.Printf("Quota failure: %s", info)
			default:
				log.Printf("Unexpected type: %s", info)
			}
		}
		os.Exit(1)
	}
	log.Printf("Greeting: %s", r.Message)
}