9.consul獲取服務實例，調用測試

package main

import (
    "context"
    "fmt"
    "github.com/go-kit/kit/endpoint"
    "github.com/go-kit/kit/log"
    "github.com/go-kit/kit/sd"
    "github.com/go-kit/kit/sd/consul"
    httptransport "github.com/go-kit/kit/transport/http"
    consulapi "github.com/hashicorp/consul/api"
    "gomicro2/Services"
    "io"
    "net/url"
    "os"
)

func main() {
    //第一步創建client
    {
        config := consulapi.DefaultConfig()
        config.Address = "localhost:8500"
        api_client, _ := consulapi.NewClient(config)
        client:= consul.NewClient(api_client)

        var logger log.Logger
        {
            logger = log.NewLogfmtLogger(os.Stdout)
            var Tag = []string{"primary"}
            //第二部創建一個consul的實例
            instancer := consul.NewInstancer(client, logger, "userservice", Tag, true) //最后的true表示只有通過健康檢查的服務才能被得到
            {
                factory := func(service_url string) (endpoint.Endpoint, io.Closer, error) { //factory定義了如何獲得服務端的endpoint,這里的service_url是從consul中讀取到的service的address我這里是192.168.3.14:8000
                    tart, _ := url.Parse("http://" + service_url) //server ip +8080真實服務的地址
                    return httptransport.NewClient("GET", tart, Services.GetUserInfo_Request, Services.GetUserInfo_Response).Endpoint(), nil, nil //我再GetUserInfo_Request里面定義了訪問哪一個api把url拼接成了http://192.168.3.14:8000/v1/user/{uid}的形式
                }
                endpointer := sd.NewEndpointer(instancer, factory, logger)
                endpoints, _ := endpointer.Endpoints()
                fmt.Println("服務有", len(endpoints), "條")
                getUserInfo := endpoints[0] //寫死獲取第一個
                ctx := context.Background() //第三步：創建一個context上下文對象

                //第四步：執行
                res, err := getUserInfo(ctx, Services.UserRequest{Uid: 101})
                if err != nil {
                    fmt.Println(err)
                    os.Exit(1)
                }
                //第五步：斷言，得到響應值
                userinfo := res.(Services.UserResponse)
                fmt.Println(userinfo.Result)
            }
        }
    }

}

來自為知筆記(Wiz)