Golang マイクロサービス開発ではどのようなコア機能を実現できますか?

package main

import (
    "fmt"
    "log"
    "net/http"
    "os"

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

func main() {
    // 创建Consul客户端
    client, err := api.NewClient(api.DefaultConfig())
    if err != nil {
        log.Fatal(err)
        os.Exit(1)
    }

    // 注册服务
    registration := &api.AgentServiceRegistration{
        Name: "my-service",
        ID:   "my-service-1",
        Tags: []string{"golang", "microservice"},
        Port: 8080,
        Check: &api.AgentServiceCheck{
            HTTP:     "http://localhost:8080/health",
            Interval: "10s",
        },
    }

    err = client.Agent().ServiceRegister(registration)
    if err != nil {
        log.Fatal(err)
        os.Exit(1)
    }

    // 发现服务
    services, _, err := client.Catalog().Service("my-service", "", nil)
    if err != nil {
        log.Fatal(err)
        os.Exit(1)
    }

    for _, service := range services {
        fmt.Printf("Service ID: %s, Service Address: %s, Service Port: %d
", service.ServiceID, service.ServiceAddress, service.ServicePort)
    }

    // 停止服务注册
    defer func() {
        if err := client.Agent().ServiceDeregister("my-service-1"); err != nil {
            log.Fatal(err)
            os.Exit(1)
        }
    }()
}

package main

import (
    "log"
    "math/rand"
    "net/http"
    "net/url"
    "time"

    "github.com/gin-gonic/gin"
)

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

    // 定义服务列表
    services := []string{
        "http://localhost:8081",
        "http://localhost:8082",
        "http://localhost:8083",
    }

    r.GET("/api", func(c *gin.Context) {
        // 随机选择一个服务
        target := services[rand.Int()%len(services)]
        // 创建反向代理
        proxy := NewSingleHostReverseProxy(target)
        proxy.ServeHTTP(c.Writer, c.Request)
    })

    if err := r.Run(":8080"); err != nil {
        log.Fatal(err)
    }
}

// 创建反向代理
func NewSingleHostReverseProxy(target string) *httputil.ReverseProxy {
    url, _ := url.Parse(target)
    proxy := httputil.NewSingleHostReverseProxy(url)
    return proxy
}

package main

import (
    "fmt"
    "log"
    "net/http"
    "time"

    "github.com/afex/hystrix-go/hystrix"
)

const (
    circuitName  = "my-circuit"
    commandName  = "my-command"
    timeout      = 500 // 毫秒
    maxConcurrecy  = 10
    errorThresholdPercentage = 50
)

func main() {
    hystrix.ConfigureCommand(circuitName, hystrix.CommandConfig{
        Timeout:                timeout,
        MaxConcurrentRequests:  maxConcurrecy,
        ErrorPercentThreshold:  errorThresholdPercentage,
    })

    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        hystrix.DoCircuit(circuitName, func() error {
            resp, err := http.Get("http://localhost:8080/some-api")
            if err != nil {
                return err
            }
            defer resp.Body.Close()

            _, err = io.Copy(w, resp.Body)
            return err
        }, func(err error) error {
            fmt.Fprintln(w, "服务不可用，请稍后重试")
            return nil
        })
    })

    log.Fatal(http.ListenAndServe(":8080", nil))
}