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rttasker.go
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rttasker.go
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package crontasker
import (
"bufio"
"context"
"fmt"
"log"
"os"
"os/exec"
"strings"
"syscall"
"time"
"github.com/robfig/cron/v3"
)
var (
debug bool
)
func SetDebug(set bool) {
debug = set
}
func debugf(format string, args ...interface{}) {
if debug {
log.Printf("[crontasker]DEBUG "+format, args...)
}
}
type Task struct {
CronSpec string
LastTime time.Duration
Cmd string
Args []string
}
func (t *Task) Run() {
if t.LastTime == 0 {
t.runOnce()
} else {
t.runWithDeadline()
}
}
func (t *Task) runOnce() {
debugf("Run %s args %v\n", t.Cmd, t.Args)
cmd := exec.Command(t.Cmd, t.Args...)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
if err := cmd.Run(); err != nil {
log.Printf("Task failed with err, %v", err)
}
debugf("Task end")
}
func (t *Task) runWithDeadline() {
deadline := time.Now().Add(t.LastTime)
for {
debugf("Run %s args %v, endat %v, now %v\n", t.Cmd, t.Args, deadline, time.Now())
ctx, cancel := context.WithDeadline(context.Background(), deadline)
cmd := exec.Command(t.Cmd, t.Args...)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
if err := cmd.Start(); err != nil {
log.Printf("Task failed to start, %v", err)
cancel()
time.Sleep(time.Second)
continue
}
go func() {
<-ctx.Done()
debugf("ctx done")
if cmd.Process != nil {
// kill Process Group
if err := syscall.Kill(-cmd.Process.Pid, syscall.SIGKILL); err != nil {
log.Printf("calling kill error %v", err)
}
}
return
}()
if err := cmd.Wait(); err != nil {
log.Printf("Task Process ended, err: %v", err)
}
cancel()
if time.Now().Before(deadline) {
log.Printf("Task restart")
continue
}
break
}
debugf("Task end")
}
func parseTask(line string) (*Task, error) {
cset := strings.Split(line, " ")
if len(cset) < 7 {
return nil, fmt.Errorf("line len split error, %s", line)
}
// * * * * *
spec := strings.Join(cset[:5], " ")
// 10m
last, err := time.ParseDuration(cset[5])
if err != nil {
last = 0
}
cmd := cset[6]
args := cset[7:]
task := &Task{
CronSpec: spec,
Cmd: cmd,
Args: args,
LastTime: last,
}
debugf("task: %v", task)
return task, nil
}
func CronDaemon(conf string) error {
var opts []cron.Option
if debug {
opts = append(opts, cron.WithLogger(
cron.VerbosePrintfLogger(log.New(os.Stdout, "crontasker: ", log.LstdFlags))))
}
c := cron.New(opts...)
log.Printf("config: %s", conf)
cf, err := os.Open(conf)
if err != nil {
return err
}
scanner := bufio.NewScanner(cf)
for scanner.Scan() {
// fmt.Println(scanner.Text())
line := strings.Trim(scanner.Text(), " \r\n")
if line == "" {
continue
}
if strings.HasPrefix(line, "#") {
continue
}
task, err := parseTask(line)
if err != nil {
log.Printf("Task failed to create, %v", err)
continue
}
c.AddJob(task.CronSpec, task)
}
cf.Close()
jobs := len(c.Entries())
if jobs > 0 {
log.Printf("found %d cron jobs", jobs)
c.Run()
} else {
log.Printf("no task prased, exit")
}
return nil
}