kratos/examples/helloworld/client/main.go

package main

import (
	"context"
	"log"
	"net/http"

	pb "github.com/go-kratos/kratos/examples/helloworld/helloworld"
	"github.com/go-kratos/kratos/v2/errors"
	"github.com/go-kratos/kratos/v2/middleware"
	"github.com/go-kratos/kratos/v2/middleware/recovery"
	"github.com/go-kratos/kratos/v2/middleware/status"
	transgrpc "github.com/go-kratos/kratos/v2/transport/grpc"
	transhttp "github.com/go-kratos/kratos/v2/transport/http"
)

func main() {
	callHTTP()
	callGRPC()
}

func callHTTP() {
	client, err := transhttp.NewClient(
		context.Background(),
		transhttp.WithMiddleware(
			middleware.Chain(
				recovery.Recovery(),
				status.Client(),
			),
		),
	)
	if err != nil {
		log.Fatal(err)
	}
	req, err := http.NewRequest("GET", "http://127.0.0.1:8000/helloworld/kratos", nil)
	if err != nil {
		log.Fatal(err)
	}
	reply := new(pb.HelloReply)
	if err := transhttp.Do(client, req, reply); err != nil {
		log.Fatal(err)
	}

	log.Printf("[http] SayHello %s\n", reply.Message)

	// returns error
	req, err = http.NewRequest("GET", "http://127.0.0.1:8000/helloworld/error", nil)
	if err != nil {
		log.Fatal(err)
	}
	if err := transhttp.Do(client, req, reply); err != nil {
		log.Printf("[http] SayHello error is invalid argument: %v\n", err)
	}
}

func callGRPC() {
	conn, err := transgrpc.DialInsecure(
		context.Background(),
		transgrpc.WithEndpoint("127.0.0.1:9000"),
		transgrpc.WithMiddleware(
			middleware.Chain(
				status.Client(),
				recovery.Recovery(),
			),
		),
	)
	if err != nil {
		log.Fatal(err)
	}
	client := pb.NewGreeterClient(conn)
	reply, err := client.SayHello(context.Background(), &pb.HelloRequest{Name: "kratos"})
	if err != nil {
		log.Fatal(err)
	}
	log.Printf("[grpc] SayHello %+v\n", reply)

	// returns error
	_, err = client.SayHello(context.Background(), &pb.HelloRequest{Name: "error"})
	if err != nil {
		log.Printf("[grpc] SayHello error: %v\n", err)
	}
	if errors.IsBadRequest(err) {
		log.Printf("[grpc] SayHello error is invalid argument: %v\n", err)
	}
}