kratos/examples/middleware/main.go

package main

import (
	"context"
	"fmt"
	"log"

	"github.com/go-kratos/kratos/examples/helloworld/helloworld"
	"github.com/go-kratos/kratos/v2"
	"github.com/go-kratos/kratos/v2/middleware"
	"github.com/go-kratos/kratos/v2/transport/grpc"
	"github.com/go-kratos/kratos/v2/transport/http"
)

type server struct {
	helloworld.UnimplementedGreeterServer
}

func (s *server) SayHello(ctx context.Context, in *helloworld.HelloRequest) (*helloworld.HelloReply, error) {
	return &helloworld.HelloReply{Message: "hello"}, nil
}

func authMiddleware(handler middleware.Handler) middleware.Handler {
	return func(ctx context.Context, req interface{}) (reply interface{}, err error) {
		log.Println("auth middleware in", req)
		reply, err = handler(ctx, req)
		fmt.Println("auth middleware out", reply)
		return
	}
}

func loggingMiddleware(handler middleware.Handler) middleware.Handler {
	return func(ctx context.Context, req interface{}) (reply interface{}, err error) {
		fmt.Println("logging middleware in", req)
		reply, err = handler(ctx, req)
		fmt.Println("logging middleware out", reply)
		return
	}
}

func main() {
	httpSrv := http.NewServer(
		http.Address(":8000"),
		http.Middleware(
			loggingMiddleware,
			authMiddleware,
		),
	)
	grpcSrv := grpc.NewServer(
		grpc.Address(":9000"),
		grpc.Middleware(
			loggingMiddleware,
			authMiddleware,
		),
	)
	s := &server{}
	helloworld.RegisterGreeterServer(grpcSrv, s)
	helloworld.RegisterGreeterHTTPServer(httpSrv, s)
	app := kratos.New(
		kratos.Name("helloworld"),
		kratos.Server(
			httpSrv,
			grpcSrv,
		),
	)
	if err := app.Run(); err != nil {
		log.Fatal(err)
	}
}