使用Go语言构建可扩展的微服务架构

go get github.com/hashicorp/consul/api

package main

import (
    "fmt"
    "log"

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

func main() {
    // 创建Consul配置
    config := api.DefaultConfig()

    // 创建Consul客户端
    client, err := api.NewClient(config)
    if err != nil {
        log.Fatal(err)
    }

    // 打印Consul客户端信息
    fmt.Printf("Consul客户端信息：%v
", client)
}

package main

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

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

func main() {
    // 定义Hystrix熔断器配置
    hystrix.ConfigureCommand("my_command", hystrix.CommandConfig{
        Timeout:                1000,
        MaxConcurrentRequests:  100,
        ErrorPercentThreshold:  25,
        RequestVolumeThreshold: 10,
        SleepWindow:            5000,
    })

    // 定义服务的URL列表
    urls := []string{
        "http://service1:8080",
        "http://service2:8080",
        "http://service3:8080",
    }

    // 为每个服务URL创建一个Hystrix熔断器
    for _, url := range urls {
        hystrix.Do("my_command", func() error {
            _, err := http.Get(url)
            return err
        }, func(err error) error {
            // 处理熔断逻辑
            log.Printf("%v请求失败，执行降级处理逻辑
", url)
            return nil
        })
    }

    // ...
}

package main

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

func main() {
    // 定义一个HTTP处理函数
    http.HandleFunc("/hello", func(w http.ResponseWriter, r *http.Request) {
        fmt.Fprintf(w, "Hello, World!")
    })

    // 启动HTTP服务
    log.Fatal(http.ListenAndServe(":8080", nil))
}