如何使用golang框架构建分布式系统

import (
    "context"

    "github.com/grpc/codes"
    "github.com/grpc/status"

    pb "github.com/example/fileserver/proto"
)

type FileServer struct {
    // 实现接口的所有方法
}

func (s *FileServer) ReadFile(ctx context.Context, in *pb.ReadFileRequest) (*pb.ReadFileResponse, error) {
    // 根据 in.FileName 读取文件并返回文件内容
}

func (s *FileServer) WriteFile(ctx context.Context, in *pb.WriteFileRequest) (*pb.WriteFileResponse, error) {
    // 根据 in.FileName 写入文件，并返回状态
}

func NewFileServer() *FileServer {
    return &FileServer{}
}

import (
    "fmt"
    "log"

    consul "github.com/hashicorp/consul/api"
)

func RegisterServiceWithConsul() error {
    // 创建 Consul 客户端
    client, err := consul.NewClient(consul.DefaultConfig())
    if err != nil {
        return fmt.Errorf("failed to create Consul client: %w", err)
    }

    // 注册服务
    reg := &consul.AgentServiceRegistration{
        Name: "file-server",
        Port: 50051,
    }
    if err := client.Agent().ServiceRegister(reg); err != nil {
        return fmt.Errorf("failed to register service with Consul: %w", err)
    }

    // 注销服务（在程序退出时调用）
    defer func() {
        if err := client.Agent().ServiceDeregister("file-server"); err != nil {
            log.Printf("failed to deregister service with Consul: %v", err)
        }
    }()

    return nil
}

import (
    "context"
    "fmt"
    "io"
    "os"

    pb "github.com/example/fileserver/proto"

    "google.golang.org/grpc"
)

func main() {
    // 连接到 gRPC 服务
    conn, err := grpc.Dial("127.0.0.1:50051", grpc.WithInsecure())
    if err != nil {
        log.Fatalf("failed to connect to server: %v", err)
    }
    defer conn.Close()

    // 创建 gRPC 客户机
    client := pb.NewFileServiceClient(conn)

    // 读文件
    resp, err := client.ReadFile(context.Background(), &pb.ReadFileRequest{
        FileName: "file.txt",
    })
    if err != nil {
        status.FromError(err)
        if codes.Unavailable == status.Code(err) {
            log.Fatalf("failed to read file: %v", err)
        }
    }
    fmt.Println(resp.GetContent())

    // 写文件
    out, err := os.OpenFile("new-file.txt", os.O_RDWR|os.O_CREATE, 0755)
    if err != nil {
        log.Fatal(err)
    }
    _, err = client.WriteFile(context.Background(), &pb.WriteFileRequest{
        FileName: "new-file.txt",
        Content:  []byte("内容"),
    })
    if err != nil {
        status.FromError(err)
        if codes.Unavailable == status.Code(err) {
            log.Fatalf("failed to write file: %v", err)
        }
    }
    io.Copy(out, resp.GetContent())
}