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node.go
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node.go
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package service
import (
"context"
"encoding/json"
"fmt"
"github.com/coreos/etcd/clientv3"
"github.com/coreos/etcd/mvcc/mvccpb"
"github.com/tmnhs/crony/admin/internal/model/request"
"github.com/tmnhs/crony/common/models"
"github.com/tmnhs/crony/common/pkg/config"
"github.com/tmnhs/crony/common/pkg/dbclient"
"github.com/tmnhs/crony/common/pkg/etcdclient"
"github.com/tmnhs/crony/common/pkg/logger"
"github.com/tmnhs/crony/common/pkg/notify"
"github.com/tmnhs/crony/common/pkg/utils"
"strings"
"sync"
"time"
)
type NodeWatcherService struct {
client *etcdclient.Client
nodeList map[string]models.Node
lock sync.Mutex
}
var DefaultNodeWatcher *NodeWatcherService
func NewNodeWatcherService() *NodeWatcherService {
return &NodeWatcherService{
client: etcdclient.GetEtcdClient(),
nodeList: make(map[string]models.Node),
}
}
func (n *NodeWatcherService) Watch() error {
resp, err := n.client.Get(context.Background(), etcdclient.KeyEtcdNodeProfile, clientv3.WithPrefix())
if err != nil {
return err
}
_ = n.extractNodes(resp)
go n.watcher()
return nil
}
func (n *NodeWatcherService) watcher() {
rch := n.client.Watch(context.Background(), etcdclient.KeyEtcdNodeProfile, clientv3.WithPrefix())
for wresp := range rch {
for _, ev := range wresp.Events {
switch ev.Type {
case mvccpb.PUT:
n.setNodeList(n.GetUUID(string(ev.Kv.Key)), string(ev.Kv.Value))
case mvccpb.DELETE:
uuid := n.GetUUID(string(ev.Kv.Key))
n.delNodeList(uuid)
logger.GetLogger().Warn(fmt.Sprintf("crony node[%s] DELETE event detected", uuid))
node := &models.Node{UUID: uuid}
err := node.FindByUUID()
if err != nil {
logger.GetLogger().Error(fmt.Sprintf("crony node[%s] find by uuid error:%s", uuid, err.Error()))
return
}
success, fail, err := n.FailOver(uuid)
if err != nil {
logger.GetLogger().Error(fmt.Sprintf("crony node[%s] fail over error:%s", uuid, err.Error()))
return
}
// if the failover is all successful, delete the node in the database
if fail.Count() == 0 {
err = node.Delete()
if err != nil {
logger.GetLogger().Error(fmt.Sprintf("crony node[%s] delete by uuid error:%s", uuid, err.Error()))
}
}
//Node inactivation information defaults to email.
msg := ¬ify.Message{
Type: notify.NotifyTypeMail,
IP: fmt.Sprintf("%s:%s", node.IP, node.PID),
Subject: "节点失活报警",
Body: fmt.Sprintf("[Crony Warning]crony node[%s] in the cluster has failed,,fail over success count:%d jobID are :%s ,fail count:%d jobID are :%s ", uuid, success.Count(), success.String(), fail.Count(), fail.String()),
To: config.GetConfigModels().Email.To,
OccurTime: time.Now().Format(utils.TimeFormatSecond),
}
go notify.Send(msg)
}
}
}
}
func (n *NodeWatcherService) extractNodes(resp *clientv3.GetResponse) []string {
nodes := make([]string, 0)
if resp == nil || resp.Kvs == nil {
return nodes
}
for i := range resp.Kvs {
if v := resp.Kvs[i].Value; v != nil {
n.setNodeList(n.GetUUID(string(resp.Kvs[i].Key)), string(resp.Kvs[i].Value))
nodes = append(nodes, string(v))
}
}
return nodes
}
func (n *NodeWatcherService) setNodeList(key, val string) {
var node models.Node
err := json.Unmarshal([]byte(val), &node)
if err != nil {
logger.GetLogger().Warn(fmt.Sprintf("discover node[%s] json error:%s", key, err.Error()))
return
}
n.lock.Lock()
n.nodeList[key] = node
n.lock.Unlock()
logger.GetLogger().Debug(fmt.Sprintf("discover node node[%s] with pid[%s]", key, val))
//Wait for the node to be fully started and assign the node
time.Sleep(5 * time.Second)
//find unassigned job
jobs, err := DefaultJobService.GetNotAssignedJob()
if err != nil {
logger.GetLogger().Warn(fmt.Sprintf("discover node[%s],pid[%s] and get not assigned job err:%s", key, val, err.Error()))
return
}
for _, job := range jobs {
/*if job.Type == models.JobTypeCmd && !config.GetConfigModels().System.CmdAutoAllocation {
logger.GetLogger().Warn(fmt.Sprintf("assign unassigned job[%d] don't support cmd type", job.ID))
continue
}*/
err = job.Unmarshal()
if err != nil {
logger.GetLogger().Warn(fmt.Sprintf("assign unassigned job[%d] json unmarshal error:%s", job.ID, err.Error()))
continue
}
oldUUID := job.RunOn
nodeUUID := DefaultJobService.AutoAllocateNode()
if nodeUUID == "" {
//If automatic allocation fails, it will be directly assigned to the new node.
nodeUUID = key
}
err = n.assignJob(nodeUUID, &job)
if err != nil {
logger.GetLogger().Warn(fmt.Sprintf("assign unassigned job[%d] error:%s", job.ID, err.Error()))
continue
}
//Delete the key value if the transfer is successful
_, err = etcdclient.Delete(fmt.Sprintf(etcdclient.KeyEtcdJob, oldUUID, job.ID))
if err != nil {
logger.GetLogger().Error(fmt.Sprintf("node[%s] job[%d] fail over etcd delete job error:%s", nodeUUID, job.ID, err.Error()))
continue
}
}
}
func (n *NodeWatcherService) delNodeList(key string) {
n.lock.Lock()
defer n.lock.Unlock()
delete(n.nodeList, key)
logger.GetLogger().Debug(fmt.Sprintf("delelte node[%s]", key))
}
func (n *NodeWatcherService) List2Array() []string {
n.lock.Lock()
defer n.lock.Unlock()
nodes := make([]string, 0)
for k, _ := range n.nodeList {
nodes = append(nodes, k)
}
return nodes
}
func (n *NodeWatcherService) Close() error {
return nil
}
func (n *NodeWatcherService) GetUUID(key string) string {
// /crony/node/<node_uuid>
index := strings.LastIndex(key, "/")
if index == -1 {
return ""
}
return key[index+1:]
}
func (n *NodeWatcherService) Search(s *request.ReqNodeSearch) ([]models.Node, int64, error) {
db := dbclient.GetMysqlDB().Table(models.CronyNodeTableName)
if len(s.UUID) > 0 {
db = db.Where("uuid = ?", s.UUID)
}
if len(s.IP) > 0 {
db.Where("ip = ?", s.IP)
}
if s.Status > 0 {
db.Where("status = ?", s.Status)
}
if s.UpTime > 0 {
db.Where("up > ?", s.UpTime)
}
nodes := make([]models.Node, 2)
var total int64
err := db.Count(&total).Error
if err != nil {
return nil, 0, err
}
err = db.Limit(s.PageSize).Offset((s.Page - 1) * s.PageSize).Order("up desc").Find(&nodes).Error
if err != nil {
return nil, 0, err
}
return nodes, total, nil
}
func (n *NodeWatcherService) GetJobCount(nodeUUID string) (int, error) {
resps, err := etcdclient.Get(fmt.Sprintf(etcdclient.KeyEtcdJobProfile, nodeUUID), clientv3.WithPrefix(), clientv3.WithCountOnly())
if err != nil {
return 0, err
}
return int(resps.Count), nil
}
type Result []int
func (r Result) Count() (count int) {
for _, v := range r {
if v != 0 {
count++
}
}
return
}
func (r Result) String() (str string) {
str = "["
for _, v := range r {
if v != 0 {
str += fmt.Sprintf("%d,", v)
}
}
str += "]"
return
}
func (n *NodeWatcherService) assignJob(nodeUUID string, job *models.Job) (err error) {
if nodeUUID == "" {
return fmt.Errorf("node uuid can't be null")
}
node, ok := n.nodeList[nodeUUID]
if !ok {
return fmt.Errorf("assign unassigned job[%d] but node[%s] not exist ", job.ID, nodeUUID)
}
job.InitNodeInfo(models.JobStatusAssigned, node.UUID, node.Hostname, node.IP)
b, err := json.Marshal(job)
if err != nil {
return
}
_, err = etcdclient.Put(fmt.Sprintf(etcdclient.KeyEtcdJob, nodeUUID, job.ID), string(b))
if err != nil {
return
}
err = job.Update()
if err != nil {
return
}
return
}
func (n *NodeWatcherService) FailOver(nodeUUID string) (success Result, fail Result, err error) {
jobs, err := n.GetJobs(nodeUUID)
if err != nil {
logger.GetLogger().Error(fmt.Sprintf("node[%s] fail over get jobs error:%s", nodeUUID, err.Error()))
return
}
if len(jobs) == 0 {
return
}
for _, job := range jobs {
/*//Determine whether shell command failover is supported
if job.Type == models.JobTypeCmd && !config.GetConfigModels().System.CmdAutoAllocation {
logger.GetLogger().Warn(fmt.Sprintf("node[%s] job[%d] fail over don't support cmd type", nodeUUID, job.ID))
fail = append(fail, job.ID)
continue
}*/
oldUUID := job.RunOn
autoUUID := DefaultJobService.AutoAllocateNode()
if autoUUID == "" {
logger.GetLogger().Warn(fmt.Sprintf("node[%s] job[%d] fail over auto allocate node error", nodeUUID, job.ID))
fail = append(fail, job.ID)
continue
}
err = n.assignJob(autoUUID, &job)
if err != nil {
logger.GetLogger().Warn(fmt.Sprintf("node[%s] job[%d] fail over assign job error", nodeUUID, job.ID))
fail = append(fail, job.ID)
continue
}
//Delete the key value if the transfer is successful
_, err = etcdclient.Delete(fmt.Sprintf(etcdclient.KeyEtcdJob, oldUUID, job.ID))
if err != nil {
logger.GetLogger().Error(fmt.Sprintf("node[%s] job[%d] fail over etcd delete job error:%s", nodeUUID, job.ID, err.Error()))
fail = append(fail, job.ID)
continue
}
success = append(success, job.ID)
}
return
}
//get all the job under a node
func (n *NodeWatcherService) GetJobs(nodeUUID string) (jobs []models.Job, err error) {
resps, err := etcdclient.Get(fmt.Sprintf(etcdclient.KeyEtcdJobProfile, nodeUUID), clientv3.WithPrefix())
if err != nil {
return
}
count := len(resps.Kvs)
if count == 0 {
return
}
for _, j := range resps.Kvs {
var job models.Job
if err := json.Unmarshal(j.Value, &job); err != nil {
logger.GetLogger().Warn(fmt.Sprintf("job[%s] umarshal err: %s", string(j.Key), err.Error()))
continue
}
jobs = append(jobs, job)
}
return
}
func (n *NodeWatcherService) GetNodeCount(status int) (int64, error) {
db := dbclient.GetMysqlDB().Table(models.CronyNodeTableName)
if status > 0 {
db = db.Where("status = ?", status)
}
var total int64
err := db.Count(&total).Error
if err != nil {
return 0, err
}
return total, nil
}
func GetNodeSystemInfo(uuid string) (s *utils.Server, err error) {
defer func() {
_, err = etcdclient.Delete(fmt.Sprintf(etcdclient.KeyEtcdSystemSwitch, uuid))
}()
s = new(utils.Server)
res, err := etcdclient.Get(fmt.Sprintf(etcdclient.KeyEtcdSystemGet, uuid), clientv3.WithPrefix())
if err != nil || len(res.Kvs) == 0 {
return
}
err = json.Unmarshal(res.Kvs[0].Value, s)
if err != nil {
logger.GetLogger().Error(fmt.Sprintf("json error:%v", err))
}
return
}