Let's talk about how to install gRPC in Go language

gRPC is Google’s open source, high-performance RPC framework that can easily implement cross-language remote calls. This article will introduce how to install gRPC in Go language and build a simple gRPC service.

1. Install gRPC and protobuf

First, we need to install gRPC and protobuf. They are two separate packages, but gRPC requires protobuf to serialize data. In order to install, we can use the following command:

$ go get -u google.golang.org/grpc
$ go get -u github.com/golang/protobuf/protoc-gen-go

2. Install protoc

Next, we need to install the protobuf compiler protoc. It can compile .proto files into code that can be used by the Go language. In Linux systems, you can use the following command to install:

$ sudo apt install -y protobuf-compiler

In macOS systems, you can use brew to install:

$ brew install protobuf

Or you can go to the official website to download and install manually.

3. Writing the .proto file

Before we start writing the gRPC service, we need to define our RPC interface. This can be done through a .proto file, which describes our service interface and message format. Here is a simple example:

syntax = "proto3";

package helloworld;

message HelloRequest {
  string name = 1;
}

message HelloReply {
  string message = 1;
}

service Greeter {
  rpc SayHello (HelloRequest) returns (HelloReply);
}

In the above example, we have defined a service called Greeter, which has an RPC interface called SayHello, which accepts a HelloRequest parameter and returns a HelloReply parameter. Each parameter is defined using protobuf's message.

4. Generate code using protoc

Now we can use the protobuf compiler protoc to generate Go code. Use the following command:

$ protoc --go_out=plugins=grpc:. helloworld.proto

This will generate a file called helloworld.pb.go that contains all the structures and interfaces we defined in the .proto file.

5. Writing gRPC Service

Now it’s time to write our gRPC service. Here is a simple service example:

package main

import (
    "context"
    "log"
    "net"

    "google.golang.org/grpc"

    pb "your_module/helloworld"
)

const (
    port = ":50051"
)

// server is used to implement helloworld.GreeterServer.
type server struct{}

// SayHello implements helloworld.GreeterServer
func (s *server) SayHello(ctx context.Context, in *pb.HelloRequest) (*pb.HelloReply, error) {
    log.Printf("Received: %v", in.GetName())
    return &pb.HelloReply{Message: "Hello " + in.GetName()}, nil
}

func main() {
    lis, err := net.Listen("tcp", port)
    if err != nil {
        log.Fatalf("failed to listen: %v", err)
    }
    s := grpc.NewServer()
    pb.RegisterGreeterServer(s, &server{})
    log.Printf("Listening on %v", port)
    if err := s.Serve(lis); err != nil {
        log.Fatalf("failed to serve: %v", err)
    }
}

In the above example, we implemented the interface we defined in the .proto file and registered it with the gRPC server.

6. Running the Service

Finally, we can run our gRPC service and test it using the client. The service can be run using the following command:

$ go run server.go

Then, in another terminal window, the client can be run using the following command:

$ go run client.go

After the client is running, a request will be sent to the gRPC server , and print out the response message.

This is a simple example, we can use more advanced features to create a more powerful gRPC service.

Summary

In this article, we introduced how to install gRPC in Go language and created a simple gRPC service example. gRPC provides an easy way to make remote calls across languages ​​with very high performance and efficiency.

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