Application method of grpc and http2 of Golang function

Introduction
Since Golang was released, it has been popular among developers. Now, more and more companies and developers are starting to use Golang to build high-performance microservice applications. In this article, we will explore the application methods of grpc and http2 in Golang functions.

What is gRPC?

gRPC is a modern open source high-performance RPC framework. It makes communication between client and server applications easier and more reliable. gRPC is open sourced by Google. It is more convenient to use gRPC in Golang functions because it uses Protocol Buffers as the data protocol.

Protocol Buffers is a lightweight, efficient serialized data protocol that can serialize structured data into bytecode for transmission. Designers can use .proto files to define data structures and then use plug-ins provided by gRPC to generate code for different programming languages ​​from the .proto files.

gRPC application scenarios include but are not limited to:

IoT devices: gRPC is very suitable for communication between IoT and sensor devices because it is very lightweight and efficient.

Microservices: As an RPC framework, gRPC is well suited for microservice architectures because it can handle large amounts of data and requests.

Distributed system: gRPC is an ideal RPC framework for distributed systems because of its high availability, high performance, and cross-platform characteristics.

Like many Golang functional applications, gRPC is a stream-based service, which means that the client and server can send a stream of data to each other instead of an instantaneous request-response.

gRPC usage

The following is the Go code that references gRPC. With the following method, it will help us start the gRPC application and connect to the server.

import (
    "github.com/gin-gonic/gin"
    "google.golang.org/grpc"
)

func main() {
    router := gin.Default()
    //grpc服务连接地址
    conn, err := grpc.Dial("127.0.0.1:50051", grpc.WithInsecure())
    if err != nil {
        panic(err)
    }
    //关闭连接
    defer conn.Close()
    //启动路由
    router.Run(":8080")
}

In this code, we connect to the gRPC server on localhost and start our router on port 8080. Routers in Golang functions can make applications more convenient and reliable.

Implementing gRPC server

The following is the code to create a gRPC server in a Golang function:

import (
    "context"
    "github.com/gin-gonic/gin"
    "google.golang.org/grpc"
    "google.golang.org/grpc/reflection"
    "net"
)

//定义Service
type UserService struct {}

//实现Service方法
func (u *UserService) GetUser(ctx context.Context, request *user.GetRequest) (*user.GetResponse, error) {
    user := new(GetResponse)
    return user, nil
}

func main() {
    listener, err := net.Listen("tcp", ":50051")
    if err != nil {
        panic(err)
    }
    //新建grpc服务
    grpcServer := grpc.NewServer()
    //在服务上注册UserService
    user.RegisterUserServiceServer(grpcServer, &UserService{})
    //refection服务
    reflection.Register(grpcServer)

    if err := grpcServer.Serve(listener); err != nil {
        panic(err)
    }
}

The above code creates our gRPC server and implements Service and Method. We define a type called UserService that implements the GetUser method. Next, we started the grpc server and registered it with the UserService.

As you can see from the above code, gRPC is a powerful RPC framework that can be used for reliable and efficient communication between servers and clients.

What is HTTP/2?

In the case of HTTP/2, a persistent, binary communication pipeline is used between the client and the server, and this pipeline can handle multiple requests and responses in parallel. HTTP/2 also supports important features such as server push, header compression, and flow control.

How to use HTTP/2

The following is the Go code that references HTTP/2. With the following method, it will help us start an HTTP/2 application and connect to the server.

import (
    "github.com/gin-gonic/gin"
    "golang.org/x/net/http2"
    "golang.org/x/net/http2/h2c"
    "net/http"
)

func main() {
    router := gin.Default()

    h2s := &http2.Server{}

    router.Use(h2c.NewHandler(http.DefaultServeMux, h2s))

    server := &http.Server{
        Addr:    ":8080",
        Handler: router,
    }
    server.ListenAndServeTLS("cert.pem", "key.pem")
}

In the above code, we use the gin package in the Golang function to handle HTTP/2 requests. We created an HTTP/2 server and accessed the server using the HTTPS protocol on the browser.

In case of HTTP/2, we need certificate and key to use HTTPS protocol. When we call the server.ListenAndServeTLS method, it will use the certificate and key to start the HTTPS server.

Conclusion

In this article, we explored how to use gRPC and HTTP/2 in Golang functions. gRPC is a high-performance RPC framework that enables reliable and efficient communication between servers and clients. HTTP/2 is a new HTTP protocol that improves website performance and efficiency.

Try gRPC and HTTP/2 in your next Golang functional application to improve speed and performance.

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