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proc.go
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proc.go
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package job
import (
"context"
"encoding/json"
"fmt"
"strconv"
"strings"
"sync/atomic"
"time"
clientv3 "go.etcd.io/etcd/client/v3"
"go.etcd.io/etcd/client/v3/concurrency"
)
// 当前执行中的任务信息
// key: /{etcd_prefix}/jobId/taskId/node/pid
// value: 开始执行时间
// key 会自动过期,防止进程意外退出后没有清除相关 key,过期时间可配置
type Process struct {
task *Task
// parse from key path
ID string `json:"id"` // pid
JobID string `json:"jobId"`
NodeID string `json:"nodeId"`
TaskID uint64 `json:"task_id"`
// parse from value
ProcessVal
running int32
hasPut int32
}
type ProcessVal struct {
Time time.Time `json:"time"` // 开始执行时间
Killed bool `json:"killed"` // 是否强制杀死
}
func GetProcFromKey(key string) (proc *Process, err error) {
ss := strings.Split(key, "/")
var sslen = len(ss)
if sslen < 5 {
err = fmt.Errorf("invalid proc key [%s]", key)
return
}
taskId, _ := strconv.ParseUint(ss[sslen-3], 10, 64)
proc = &Process{
ID: ss[sslen-1],
NodeID: ss[sslen-2],
TaskID: taskId,
JobID: ss[sslen-4],
}
return
}
//key: /{etcd_prefix}/jobId/taskId/node/pid
func (p *Process) Key() string {
taskId := strconv.FormatUint(p.TaskID, 10)
return ProcKeyPrefix + p.JobID + "/" + taskId + "/" + p.NodeID + "/" + p.ID
}
func (p *Process) Val() (string, error) {
b, err := json.Marshal(&p.ProcessVal)
if err != nil {
return "", err
}
return string(b), nil
}
func (p *Process) put(job *Job) (err error) {
if atomic.LoadInt32(&p.running) != 1 {
return
}
if !atomic.CompareAndSwapInt32(&p.hasPut, 0, 1) {
return
}
val, err := p.Val()
if err != nil {
return err
}
ctx, cancel := context.WithTimeout(context.Background(),
time.Duration(job.ReqTimeout)*time.Second)
defer cancel()
session, err := concurrency.NewSession(job.Client.Client, concurrency.WithTTL(10))
if err != nil {
return err
}
_, err = job.Client.Put(ctx, p.Key(), val, clientv3.WithLease(session.Lease()))
return
}
func (p *Process) Start(job *Job) {
if p == nil {
return
}
if !atomic.CompareAndSwapInt32(&p.running, 0, 1) {
return
}
if err := p.put(job); err != nil {
job.logger.Warnf("proc put[%s] err: %s", p.Key(), err.Error())
}
return
}
func (p *Process) del(job *Job) error {
if atomic.LoadInt32(&p.hasPut) != 1 {
return nil
}
ctx, cancel := context.WithTimeout(context.Background(),
time.Duration(job.ReqTimeout)*time.Second)
defer cancel()
_, err := job.Delete(ctx, p.Key())
return err
}
func (p *Process) Stop(job *Job) {
if p == nil {
return
}
if !atomic.CompareAndSwapInt32(&p.running, 1, 0) {
return
}
if err := p.del(job); err != nil {
job.logger.Warnf("proc del[%s] err: %s", p.Key(), err.Error())
}
}