package main

import (
	"bytes"
	"fmt"
	"io/ioutil"
	"net/http"
	"os/exec"
	"time"
)

func main() {

	oldPeers := GetOldPeers()
	fmt.Println("oldPeers: ", oldPeers)
	newPeers := GetNewPeers()
	fmt.Println("newPeers: ", newPeers)
	UpdatePeers(oldPeers, newPeers)
	time.Sleep(time.Second * 3)
	nowPeers := GetOldPeers()
	fmt.Println("nowPeers: ", nowPeers)
}

func GetOldPeers() string {
	str := "cat /opt/vasystem/seaweedfs_start.sh | grep peers="
	peers := RunScript(str)
	return peers
}

func GetNewPeers() string {
	getUrl := "http://192.168.20.10:9200/basicfs/_search"
	getJson := `{
    "query": {
        "bool": {
            "filter": [
                {
                    "term": {
						"application":"nodeOperation"
					}
                }
            ]
        }
    },
    "size": 1
}`

	getRes, _ := EsReq("POST", getUrl, []byte(getJson))
	fmt.Println(getRes)
	return ""
}

func UpdatePeers(oldPeers string, newPeers string) {
	str := "sed -ie 's/" + oldPeers + "/" + newPeers + "/g' /opt/vasystem/seaweedfs_start.sh"
	RunScript(str)
}

//脚本封装
func RunScript(str string) string {

	cmd := exec.Command("sh", "-c", str)
	var out bytes.Buffer
	cmd.Stdout = &out
	err := cmd.Run()
	if err != nil {
		return "运行失败"
	}
	return out.String()
}

//解析http
func EsReq(method string, url string, parama []byte) (buf []byte, err error) {
	timeout := time.Duration(10 * time.Second)
	client := http.Client{
		Timeout: timeout,
	}
	request, err := http.NewRequest(method, url, bytes.NewBuffer(parama))
	request.Header.Set("Content-type", "application/json")

	if err != nil {
		fmt.Println("build request fail !")
		return nil, err
	}

	resp, err := client.Do(request)
	if err != nil {
		fmt.Println("request error: ", err)
		return nil, err
	}

	defer resp.Body.Close()
	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		fmt.Println(err)
		return nil, err
	}
	return body, nil
}