package main
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import (
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"bytes"
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"encoding/json"
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"errors"
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"fmt"
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"io/ioutil"
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"net/http"
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"os/exec"
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"strings"
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"time"
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)
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func main() {
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oldPeers := GetOldPeers()
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fmt.Println("oldPeers: ", oldPeers)
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//AddNewMasterToPeers()
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newPeers := GetNewPeers()
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fmt.Println("newPeers: ", newPeers)
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UpdatePeers(oldPeers, newPeers)
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time.Sleep(time.Second * 3)
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nowPeers := GetOldPeers()
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fmt.Println("nowPeers: ", nowPeers)
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}
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func GetOldPeers() string {
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str := "cat /opt/vasystem/seaweedfs_start.sh | grep peers="
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peers := RunScript(str)
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return peers
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}
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func GetNewPeers() string {
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getUrl := "http://192.168.20.10:9200/basicfs/_search"
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getJson := `{
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"query": {
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"bool": {
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"filter": [
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{
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"term": {
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"application":"nodeOperation"
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}
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}
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]
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}
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},
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"size": 1
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}`
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buf, _ := EsReq("POST", getUrl, []byte(getJson))
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source, _ := Sourcelist(buf)
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//fmt.Println(source)
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peers := source[0]["peers"].([]interface{})
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fmt.Println(peers)
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p := "peers=" + strings.Replace(strings.Trim(fmt.Sprint(peers), "[]"), " ", ",", -1)
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return p
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}
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func UpdatePeers(oldPeers string, newPeers string) {
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str := "sed -ie 's/" + oldPeers + "/" + newPeers + "/g' /opt/vasystem/seaweedfs_start.sh"
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RunScript(str)
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}
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//脚本封装
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func RunScript(str string) string {
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cmd := exec.Command("sh", "-c", str)
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var out bytes.Buffer
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cmd.Stdout = &out
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err := cmd.Run()
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if err != nil {
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return "运行失败"
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}
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return out.String()
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}
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//解析http
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func EsReq(method string, url string, parama []byte) (buf []byte, err error) {
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timeout := time.Duration(10 * time.Second)
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client := http.Client{
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Timeout: timeout,
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}
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request, err := http.NewRequest(method, url, bytes.NewBuffer(parama))
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request.Header.Set("Content-type", "application/json")
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if err != nil {
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fmt.Println("build request fail !")
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return nil, err
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}
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resp, err := client.Do(request)
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if err != nil {
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fmt.Println("request error: ", err)
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return nil, err
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}
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defer resp.Body.Close()
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body, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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fmt.Println(err)
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return nil, err
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}
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return body, nil
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}
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func Sourcelist(buf []byte) (sources []map[string]interface{}, err error) {
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var info interface{}
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json.Unmarshal(buf, &info)
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out, ok := info.(map[string]interface{})
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if !ok {
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return nil, errors.New("http response interface can not change map[string]interface{}")
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}
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middle, ok := out["hits"].(map[string]interface{})
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if !ok {
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return nil, errors.New("first hits change error!")
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}
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for _, in := range middle["hits"].([]interface{}) {
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tmpbuf, ok := in.(map[string]interface{})
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if !ok {
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fmt.Println("change to source error!")
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continue
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}
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source, ok := tmpbuf["_source"].(map[string]interface{})
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if !ok {
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fmt.Println("change _source error!")
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continue
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}
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sources = append(sources, source)
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}
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return sources, nil
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}
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func AddNewMasterToPeers() (result bool) {
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peer := "192.168.5.22:6333"
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addUrl := "http://192.168.20.10:9200/basicfs/_update_by_query"
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addJson := `{
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"script": {
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"lang": "painless",
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"inline": "ctx._source.peers.add(params.newpeer)",
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"params": {
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"newpeer": "` + peer + `"
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}
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},
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"query": {
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"bool": {
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"filter": [
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{
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"term": {
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"application": "nodeOperation"
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}
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}
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]
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}
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}
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}`
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buf, _ := EsReq("POST", addUrl, []byte(addJson))
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updateRes, _ := SourceUpdated(buf)
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if updateRes == -1 {
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result = false
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} else {
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result = true
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}
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return result
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}
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func SourceUpdated(buf []byte) (total int, err error) {
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var info interface{}
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json.Unmarshal(buf, &info)
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out, ok := info.(map[string]interface{})
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if !ok {
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return -1, errors.New("http response interface can not change map[string]interface{}")
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}
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middle, ok := out["updated"].(float64)
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if !ok {
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return -1, errors.New("first total change error!")
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}
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total = int(middle)
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return total, nil
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}
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