grpc-ping/ping_client/main.go

package main

import (
	"context"
	"fmt"
	"log"
	"os"
	"time"

	"google.golang.org/grpc"

	pb "grpc-ping/ping"
)

const (
	address = "localhost:50051"
)

func genPayload(s int) string {
	var p string
	var start int = 60
	for i := start; i < (start + s); i++ {
		p += string(i)
	}
	return p
}

func main() {
	var i uint64
	ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
	defer cancel()

	data := genPayload(64)
	if len(os.Args) > 1 {
		data = os.Args[1]
	}
	conn, err := grpc.DialContext(ctx, address, grpc.WithInsecure(), grpc.WithBlock())
	if err != nil {
		log.Fatalf("did not connect: %v", err)
	}
	defer conn.Close()
	c := pb.NewPingClient(conn)

	for i = 1; ; i++ {
		rtt := time.Now()
		ctx, cancel = context.WithTimeout(context.Background(), time.Second)
		r, err := c.Ping(ctx, &pb.PingRequest{Data: data, Seq: i})
		if err != nil {
			log.Printf("could not connect to: %v", err)
			time.Sleep(1 * time.Second)
			continue
		}
		fmt.Printf("%d bytes from %s: seq=%d time=%s\n", len(r.Data), address, r.Seq, time.Since(rtt))
		time.Sleep(1 * time.Second)
	}
}