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578 lines
13 KiB
Go
578 lines
13 KiB
Go
// Beego (http://beego.me/)
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// @description beego is an open-source, high-performance web framework for the Go programming language.
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// @link http://github.com/astaxie/beego for the canonical source repository
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// @license http://github.com/astaxie/beego/blob/master/LICENSE
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// @authors astaxie
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package toolbox
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import (
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"log"
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"math"
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"sort"
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"strconv"
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"strings"
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"time"
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)
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// bounds provides a range of acceptable values (plus a map of name to value).
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type bounds struct {
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min, max uint
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names map[string]uint
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}
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// The bounds for each field.
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var (
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AdminTaskList map[string]Tasker
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stop chan bool
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seconds = bounds{0, 59, nil}
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minutes = bounds{0, 59, nil}
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hours = bounds{0, 23, nil}
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days = bounds{1, 31, nil}
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months = bounds{1, 12, map[string]uint{
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"jan": 1,
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"feb": 2,
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"mar": 3,
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"apr": 4,
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"may": 5,
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"jun": 6,
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"jul": 7,
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"aug": 8,
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"sep": 9,
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"oct": 10,
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"nov": 11,
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"dec": 12,
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}}
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weeks = bounds{0, 6, map[string]uint{
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"sun": 0,
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"mon": 1,
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"tue": 2,
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"wed": 3,
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"thu": 4,
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"fri": 5,
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"sat": 6,
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}}
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)
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const (
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// Set the top bit if a star was included in the expression.
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starBit = 1 << 63
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)
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// time taks schedule
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type Schedule struct {
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Second uint64
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Minute uint64
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Hour uint64
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Day uint64
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Month uint64
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Week uint64
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}
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// task func type
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type TaskFunc func() error
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// task interface
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type Tasker interface {
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GetStatus() string
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Run() error
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SetNext(time.Time)
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GetNext() time.Time
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SetPrev(time.Time)
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GetPrev() time.Time
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}
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// task error
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type taskerr struct {
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t time.Time
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errinfo string
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}
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// task struct
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type Task struct {
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Taskname string
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Spec *Schedule
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DoFunc TaskFunc
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Prev time.Time
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Next time.Time
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Errlist []*taskerr // like errtime:errinfo
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ErrLimit int // max length for the errlist, 0 stand for no limit
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}
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// add new task with name, time and func
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func NewTask(tname string, spec string, f TaskFunc) *Task {
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task := &Task{
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Taskname: tname,
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DoFunc: f,
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ErrLimit: 100,
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}
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task.SetCron(spec)
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return task
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}
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// get current task status
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func (tk *Task) GetStatus() string {
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var str string
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for _, v := range tk.Errlist {
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str += v.t.String() + ":" + v.errinfo + "\n"
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}
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return str
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}
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// run task
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func (tk *Task) Run() error {
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err := tk.DoFunc()
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if err != nil {
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if tk.ErrLimit > 0 && tk.ErrLimit > len(tk.Errlist) {
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tk.Errlist = append(tk.Errlist, &taskerr{t: tk.Next, errinfo: err.Error()})
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}
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}
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return err
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}
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// set next time for this task
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func (tk *Task) SetNext(now time.Time) {
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tk.Next = tk.Spec.Next(now)
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}
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// get the next call time of this task
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func (tk *Task) GetNext() time.Time {
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return tk.Next
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}
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// set prev time of this task
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func (tk *Task) SetPrev(now time.Time) {
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tk.Prev = now
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}
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// get prev time of this task
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func (tk *Task) GetPrev() time.Time {
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return tk.Prev
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}
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// six columns mean：
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// second：0-59
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// minute：0-59
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// hour：1-23
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// day：1-31
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// month：1-12
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// week：0-6（0 means Sunday）
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// some signals：
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// *： any time
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// ,： separate signal
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// －：duration
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// /n : do as n times of time duration
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/////////////////////////////////////////////////////////
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// 0/30 * * * * * every 30s
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// 0 43 21 * * * 21:43
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// 0 15 05 * * * 05:15
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// 0 0 17 * * * 17:00
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// 0 0 17 * * 1 17:00 in every Monday
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// 0 0,10 17 * * 0,2,3 17:00 and 17:10 in every Sunday, Tuesday and Wednesday
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// 0 0-10 17 1 * * 17:00 to 17:10 in 1 min duration each time on the first day of month
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// 0 0 0 1,15 * 1 0:00 on the 1st day and 15th day of month
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// 0 42 4 1 * * 4:42 on the 1st day of month
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// 0 0 21 * * 1-6 21:00 from Monday to Saturday
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// 0 0,10,20,30,40,50 * * * * every 10 min duration
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// 0 */10 * * * * every 10 min duration
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// 0 * 1 * * * 1:00 to 1:59 in 1 min duration each time
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// 0 0 1 * * * 1:00
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// 0 0 */1 * * * 0 min of hour in 1 hour duration
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// 0 0 * * * * 0 min of hour in 1 hour duration
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// 0 2 8-20/3 * * * 8:02, 11:02, 14:02, 17:02, 20:02
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// 0 30 5 1,15 * * 5:30 on the 1st day and 15th day of month
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func (t *Task) SetCron(spec string) {
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t.Spec = t.parse(spec)
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}
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func (t *Task) parse(spec string) *Schedule {
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if len(spec) > 0 && spec[0] == '@' {
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return t.parseSpec(spec)
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}
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// Split on whitespace. We require 5 or 6 fields.
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// (second) (minute) (hour) (day of month) (month) (day of week, optional)
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fields := strings.Fields(spec)
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if len(fields) != 5 && len(fields) != 6 {
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log.Panicf("Expected 5 or 6 fields, found %d: %s", len(fields), spec)
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}
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// If a sixth field is not provided (DayOfWeek), then it is equivalent to star.
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if len(fields) == 5 {
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fields = append(fields, "*")
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}
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schedule := &Schedule{
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Second: getField(fields[0], seconds),
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Minute: getField(fields[1], minutes),
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Hour: getField(fields[2], hours),
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Day: getField(fields[3], days),
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Month: getField(fields[4], months),
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Week: getField(fields[5], weeks),
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}
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return schedule
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}
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func (t *Task) parseSpec(spec string) *Schedule {
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switch spec {
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case "@yearly", "@annually":
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return &Schedule{
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Second: 1 << seconds.min,
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Minute: 1 << minutes.min,
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Hour: 1 << hours.min,
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Day: 1 << days.min,
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Month: 1 << months.min,
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Week: all(weeks),
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}
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case "@monthly":
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return &Schedule{
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Second: 1 << seconds.min,
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Minute: 1 << minutes.min,
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Hour: 1 << hours.min,
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Day: 1 << days.min,
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Month: all(months),
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Week: all(weeks),
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}
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case "@weekly":
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return &Schedule{
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Second: 1 << seconds.min,
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Minute: 1 << minutes.min,
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Hour: 1 << hours.min,
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Day: all(days),
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Month: all(months),
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Week: 1 << weeks.min,
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}
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case "@daily", "@midnight":
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return &Schedule{
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Second: 1 << seconds.min,
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Minute: 1 << minutes.min,
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Hour: 1 << hours.min,
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Day: all(days),
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Month: all(months),
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Week: all(weeks),
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}
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case "@hourly":
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return &Schedule{
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Second: 1 << seconds.min,
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Minute: 1 << minutes.min,
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Hour: all(hours),
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Day: all(days),
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Month: all(months),
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Week: all(weeks),
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}
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}
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log.Panicf("Unrecognized descriptor: %s", spec)
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return nil
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}
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// set schedule to next time
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func (s *Schedule) Next(t time.Time) time.Time {
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// Start at the earliest possible time (the upcoming second).
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t = t.Add(1*time.Second - time.Duration(t.Nanosecond())*time.Nanosecond)
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// This flag indicates whether a field has been incremented.
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added := false
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// If no time is found within five years, return zero.
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yearLimit := t.Year() + 5
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WRAP:
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if t.Year() > yearLimit {
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return time.Time{}
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}
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// Find the first applicable month.
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// If it's this month, then do nothing.
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for 1<<uint(t.Month())&s.Month == 0 {
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// If we have to add a month, reset the other parts to 0.
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if !added {
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added = true
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// Otherwise, set the date at the beginning (since the current time is irrelevant).
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t = time.Date(t.Year(), t.Month(), 1, 0, 0, 0, 0, t.Location())
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}
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t = t.AddDate(0, 1, 0)
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// Wrapped around.
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if t.Month() == time.January {
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goto WRAP
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}
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}
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// Now get a day in that month.
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for !dayMatches(s, t) {
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if !added {
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added = true
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t = time.Date(t.Year(), t.Month(), t.Day(), 0, 0, 0, 0, t.Location())
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}
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t = t.AddDate(0, 0, 1)
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if t.Day() == 1 {
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goto WRAP
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}
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}
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for 1<<uint(t.Hour())&s.Hour == 0 {
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if !added {
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added = true
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t = time.Date(t.Year(), t.Month(), t.Day(), t.Hour(), 0, 0, 0, t.Location())
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}
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t = t.Add(1 * time.Hour)
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if t.Hour() == 0 {
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goto WRAP
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}
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}
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for 1<<uint(t.Minute())&s.Minute == 0 {
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if !added {
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added = true
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t = time.Date(t.Year(), t.Month(), t.Day(), t.Hour(), t.Minute(), 0, 0, t.Location())
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}
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t = t.Add(1 * time.Minute)
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if t.Minute() == 0 {
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goto WRAP
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}
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}
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for 1<<uint(t.Second())&s.Second == 0 {
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if !added {
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added = true
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t = time.Date(t.Year(), t.Month(), t.Day(), t.Hour(), t.Minute(), t.Second(), 0, t.Location())
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}
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t = t.Add(1 * time.Second)
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if t.Second() == 0 {
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goto WRAP
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}
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}
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return t
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}
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func dayMatches(s *Schedule, t time.Time) bool {
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var (
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domMatch bool = 1<<uint(t.Day())&s.Day > 0
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dowMatch bool = 1<<uint(t.Weekday())&s.Week > 0
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)
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if s.Day&starBit > 0 || s.Week&starBit > 0 {
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return domMatch && dowMatch
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}
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return domMatch || dowMatch
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}
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// start all tasks
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func StartTask() {
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go run()
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}
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func run() {
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now := time.Now().Local()
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for _, t := range AdminTaskList {
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t.SetNext(now)
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}
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for {
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sortList := NewMapSorter(AdminTaskList)
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sortList.Sort()
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var effective time.Time
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if len(AdminTaskList) == 0 || sortList.Vals[0].GetNext().IsZero() {
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// If there are no entries yet, just sleep - it still handles new entries
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// and stop requests.
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effective = now.AddDate(10, 0, 0)
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} else {
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effective = sortList.Vals[0].GetNext()
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}
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select {
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case now = <-time.After(effective.Sub(now)):
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// Run every entry whose next time was this effective time.
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for _, e := range sortList.Vals {
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if e.GetNext() != effective {
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break
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}
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go e.Run()
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e.SetPrev(e.GetNext())
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e.SetNext(effective)
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}
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continue
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case <-stop:
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return
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}
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}
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}
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// start all tasks
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func StopTask() {
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stop <- true
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}
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// add task with name
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func AddTask(taskname string, t Tasker) {
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AdminTaskList[taskname] = t
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}
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// sort map for tasker
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type MapSorter struct {
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Keys []string
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Vals []Tasker
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}
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// create new tasker map
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func NewMapSorter(m map[string]Tasker) *MapSorter {
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ms := &MapSorter{
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Keys: make([]string, 0, len(m)),
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Vals: make([]Tasker, 0, len(m)),
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}
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for k, v := range m {
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ms.Keys = append(ms.Keys, k)
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ms.Vals = append(ms.Vals, v)
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}
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return ms
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}
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// sort tasker map
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func (ms *MapSorter) Sort() {
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sort.Sort(ms)
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}
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func (ms *MapSorter) Len() int { return len(ms.Keys) }
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func (ms *MapSorter) Less(i, j int) bool {
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if ms.Vals[i].GetNext().IsZero() {
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return false
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}
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if ms.Vals[j].GetNext().IsZero() {
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return true
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}
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return ms.Vals[i].GetNext().Before(ms.Vals[j].GetNext())
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}
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func (ms *MapSorter) Swap(i, j int) {
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ms.Vals[i], ms.Vals[j] = ms.Vals[j], ms.Vals[i]
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ms.Keys[i], ms.Keys[j] = ms.Keys[j], ms.Keys[i]
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}
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func getField(field string, r bounds) uint64 {
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// list = range {"," range}
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var bits uint64
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ranges := strings.FieldsFunc(field, func(r rune) bool { return r == ',' })
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for _, expr := range ranges {
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bits |= getRange(expr, r)
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}
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return bits
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}
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// getRange returns the bits indicated by the given expression:
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// number | number "-" number [ "/" number ]
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func getRange(expr string, r bounds) uint64 {
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var (
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start, end, step uint
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rangeAndStep = strings.Split(expr, "/")
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lowAndHigh = strings.Split(rangeAndStep[0], "-")
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singleDigit = len(lowAndHigh) == 1
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)
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var extra_star uint64
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if lowAndHigh[0] == "*" || lowAndHigh[0] == "?" {
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start = r.min
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end = r.max
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extra_star = starBit
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} else {
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start = parseIntOrName(lowAndHigh[0], r.names)
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switch len(lowAndHigh) {
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case 1:
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end = start
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case 2:
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end = parseIntOrName(lowAndHigh[1], r.names)
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default:
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log.Panicf("Too many hyphens: %s", expr)
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}
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}
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switch len(rangeAndStep) {
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case 1:
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step = 1
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case 2:
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step = mustParseInt(rangeAndStep[1])
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// Special handling: "N/step" means "N-max/step".
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if singleDigit {
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end = r.max
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}
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default:
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log.Panicf("Too many slashes: %s", expr)
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}
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if start < r.min {
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log.Panicf("Beginning of range (%d) below minimum (%d): %s", start, r.min, expr)
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}
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if end > r.max {
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log.Panicf("End of range (%d) above maximum (%d): %s", end, r.max, expr)
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}
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if start > end {
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log.Panicf("Beginning of range (%d) beyond end of range (%d): %s", start, end, expr)
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}
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return getBits(start, end, step) | extra_star
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}
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// parseIntOrName returns the (possibly-named) integer contained in expr.
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func parseIntOrName(expr string, names map[string]uint) uint {
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if names != nil {
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if namedInt, ok := names[strings.ToLower(expr)]; ok {
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return namedInt
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}
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}
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return mustParseInt(expr)
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}
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// mustParseInt parses the given expression as an int or panics.
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func mustParseInt(expr string) uint {
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num, err := strconv.Atoi(expr)
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if err != nil {
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log.Panicf("Failed to parse int from %s: %s", expr, err)
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}
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if num < 0 {
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log.Panicf("Negative number (%d) not allowed: %s", num, expr)
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}
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return uint(num)
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}
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// getBits sets all bits in the range [min, max], modulo the given step size.
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func getBits(min, max, step uint) uint64 {
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var bits uint64
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// If step is 1, use shifts.
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if step == 1 {
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return ^(math.MaxUint64 << (max + 1)) & (math.MaxUint64 << min)
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}
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|
||
// Else, use a simple loop.
|
||
for i := min; i <= max; i += step {
|
||
bits |= 1 << i
|
||
}
|
||
return bits
|
||
}
|
||
|
||
// all returns all bits within the given bounds. (plus the star bit)
|
||
func all(r bounds) uint64 {
|
||
return getBits(r.min, r.max, 1) | starBit
|
||
}
|
||
|
||
func init() {
|
||
AdminTaskList = make(map[string]Tasker)
|
||
stop = make(chan bool)
|
||
}
|