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core.go
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core.go
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package core
import (
"bytes"
"crypto/md5"
"encoding/hex"
"fmt"
"io/ioutil"
"os/exec"
"regexp"
"runtime"
"strings"
"time"
"github.com/google/wire"
"github.com/mengdu/mo"
"github.com/robfig/cron/v3"
)
func New() *Manager {
return &Manager{
cron: cron.New(cron.WithLocation(time.Local)),
// cron: cron.New(cron.WithSeconds()),
}
}
var Set = wire.NewSet(New)
type Job struct {
ID string `json:"id"`
Title string `json:"title"`
Spec string `json:"spec"`
Cmd string `json:"cmd"`
Running bool `json:"running"`
Pid int `json:"pid"`
RunCnt int `json:"run_cnt"`
PrevUse time.Duration `json:"prev_use"`
cronId cron.EntryID
}
type LWrite struct {
Log func(log []byte)
}
func (w *LWrite) Write(c []byte) (n int, err error) {
w.Log(bytes.TrimRight(c, "\n"))
return len(c), nil
}
func (j *Job) Exec(isManual bool) {
if j.Running {
mo.Errorf("Job %s is already running", j.ID)
return
}
j.Running = true
j.RunCnt++
start := time.Now()
log := mo.WithTag(j.ID)
log.Logf("Start exec %s, manual: %t, times: %d", j.Cmd, isManual, j.RunCnt)
var cmd *exec.Cmd
if runtime.GOOS == "windows" {
cmd = exec.Command("cmd.exe", "/C", j.Cmd)
} else {
cmd = exec.Command("bash", "-c", j.Cmd)
}
cmd.Stderr = &LWrite{Log: func(msg []byte) {
log.Error(string(msg))
}}
cmd.Stdout = &LWrite{Log: func(msg []byte) {
log.Log(string(msg))
}}
if err := cmd.Start(); err != nil {
log.Errorf("Error: %s", err)
}
go func() {
j.Pid = cmd.Process.Pid
if err := cmd.Wait(); err != nil {
log.Error(err)
}
j.Running = false
j.Pid = 0
j.PrevUse = time.Since(start)
log.Logf("Exec finish, use %s", j.PrevUse)
}()
}
type Manager struct {
cron *cron.Cron
jobs []Job
cronFile string
}
func (m *Manager) Start(file string) error {
jobs, err := parseCrontab(file)
if err != nil {
return err
}
m.cronFile = file
m.jobs = jobs
// mo.Infof("Jobs: %v", jobs)
for i := 0; i < len(jobs); i++ {
job := &jobs[i]
id, err := m.cron.AddFunc(job.Spec, func() {
job.Exec(false)
})
if err != nil {
return err
}
job.cronId = id
mo.Debugf("Added job: %#v", job)
}
m.cron.Start()
mo.Infof("Initiated %d jobs", len(jobs))
return nil
}
func (m *Manager) GetJobs() []Job {
return m.jobs
}
func (m *Manager) Exec(id string) error {
for i := 0; i < len(m.jobs); i++ {
if m.jobs[i].ID == id {
if m.jobs[i].Running {
return fmt.Errorf("`%s` job is already running", id)
}
m.jobs[i].Exec(true)
return nil
}
}
return fmt.Errorf("Job not found: %s", id)
}
func (m *Manager) GetCronFile() string {
return m.cronFile
}
func parseCrontab(file string) ([]Job, error) {
buf, err := ioutil.ReadFile(file)
arr := []Job{}
if err != nil {
return arr, err
}
lines := strings.Split(string(buf), "\n")
title := ""
index := uint(0)
for _, line := range lines {
line = strings.TrimSpace(line)
re := regexp.MustCompile(`^(([0-9*\/\-,]+ +?){5})(.*)$`)
if len(line) > 0 && line[0] == '#' {
line = strings.TrimSpace(line[1:])
if !re.Match([]byte(line)) {
title = line
}
continue
}
matches := re.FindStringSubmatch(line)
if len(matches) == 4 {
spec := strings.TrimSpace(matches[1])
script := strings.TrimSpace(matches[3])
index++
hash := md5.Sum([]byte(fmt.Sprintf("%d:%s", index, line)))
id := hex.EncodeToString(hash[:])
arr = append(arr, Job{
ID: id[len(id)-6:],
Title: title,
Spec: spec,
Cmd: script,
})
if title != "" {
title = ""
}
}
}
return arr, nil
}