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JobMgr.go
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JobMgr.go
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package master
import (
"context"
"encoding/json"
"github.com/coreos/etcd/clientv3"
"github.com/coreos/etcd/mvcc/mvccpb"
"github.com/staryjie/crontab/common"
"time"
)
// 任务管理器
type JobMgr struct {
client *clientv3.Client
kv clientv3.KV
lease clientv3.Lease
}
var (
G_jobMgr *JobMgr
)
// 初始化管理器
func InitJobMgr() (err error) {
var (
config clientv3.Config
client *clientv3.Client
kv clientv3.KV
lease clientv3.Lease
)
// 初始化配置
config = clientv3.Config{
Endpoints: G_config.EtcdEndpoints, // Etcd集群
DialTimeout: time.Duration(G_config.EtcdDialTimeout) * time.Millisecond, // 连接超时时间
}
// 建立连接
if client, err = clientv3.New(config); err != nil {
return
}
// 得到kv和lease API子集
kv = clientv3.NewKV(client)
lease = clientv3.NewLease(client)
// 赋值单例
G_jobMgr = &JobMgr{
client: client,
kv: kv,
lease: lease,
}
return
}
// 保存任务
func (jobMgr *JobMgr) SaveJob(job *common.Job) (oldJob *common.Job, err error) {
// 把任务保存到Etcd的 /cron/jobs/任务名 = json
var (
jobKey string
jobValue []byte
putResp *clientv3.PutResponse
oldJobObj common.Job
)
// Etcd保存的Key
jobKey = common.JOB_SAVE_DIR + job.Name
// 任务信息 json
if jobValue, err = json.Marshal(job); err != nil {
return
}
// 保存到Etcd
if putResp, err = jobMgr.kv.Put(context.TODO(), jobKey, string(jobValue), clientv3.WithPrevKV()); err != nil {
return
}
// 如果是更新,那么返回旧值
if putResp.PrevKv != nil {
// 对旧值做反序列化
if err = json.Unmarshal(putResp.PrevKv.Value, &oldJobObj); err != nil {
err = nil // 旧值反序列化失败也不影响新值的写入
return
}
oldJob = &oldJobObj
}
return
}
// 删除任务
func (jobMgr *JobMgr) DeleteJob(name string) (oldJob *common.Job, err error) {
var (
jobKey string
delResp *clientv3.DeleteResponse
oldJobObj common.Job
)
// Etcd中保存的Key
jobKey = common.JOB_SAVE_DIR + name
// 从Etcd中删除
if delResp, err = jobMgr.kv.Delete(context.TODO(), jobKey, clientv3.WithPrevKV()); err != nil {
return
}
// 返回被删除的任务信息
if len(delResp.PrevKvs) != 0 {
// 解析旧值
if err = json.Unmarshal(delResp.PrevKvs[0].Value, &oldJobObj); err != nil {
err = nil
return
}
oldJob = &oldJobObj
}
return
}
// 获取任务列表
func (jobMgr *JobMgr) ListJobs() (jobList []*common.Job, err error) {
var (
dirKey string
getResp *clientv3.GetResponse
kvPair *mvccpb.KeyValue
job *common.Job
)
// 任务保存目录
dirKey = common.JOB_SAVE_DIR
// 获取目录下所有任务信息
if getResp, err = jobMgr.kv.Get(context.TODO(), dirKey, clientv3.WithPrefix()); err != nil {
return
}
// 初始化任务列表
jobList = make([]*common.Job, 0)
// 遍历所有任务,进行反序列化
for _, kvPair = range getResp.Kvs {
job = &common.Job{}
if err = json.Unmarshal(kvPair.Value, job); err != nil {
err = nil
continue
}
jobList = append(jobList, job)
}
return
}
// 杀死任务
func (jobMgr *JobMgr) KillJob(name string) (err error) {
// 更新 /cron/killer/任务名
var (
killKey string
leaseGrantResp *clientv3.LeaseGrantResponse
leaseId clientv3.LeaseID
)
// 强杀任务路径
killKey = common.JOB_KILLER_DIR + name
// worker监听 /cron/killer/目录下的put事件,创建租约并让他自动过期
if leaseGrantResp, err = jobMgr.lease.Grant(context.TODO(), common.KILL_JOB_LEASE_TTL); err != nil {
return
}
// 租约ID
leaseId = leaseGrantResp.ID
// 设置killer标记
if _, err = jobMgr.kv.Put(context.TODO(), killKey, "", clientv3.WithLease(leaseId)); err != nil {
return
}
return
}