/
visitor_cron.go
136 lines (115 loc) · 2.83 KB
/
visitor_cron.go
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// Copyright (c) 2021 Terminus, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package pipelineyml
import (
"strings"
"time"
"github.com/erda-project/erda/pkg/cron"
)
const (
defaultListNextScheduleCount = 5
maxListNextScheduleCount = 1000
)
var DefaultCronCompensator = CronCompensator{
Enable: false,
LatestFirst: true,
StopIfLatterExecuted: true,
}
type CronVisitor struct {
// request
cronStartTime *time.Time
cronEndTime *time.Time
count int
// result
nextTimes []time.Time
isCron bool
}
func NewCronVisitor(ops ...CronVisitorOption) *CronVisitor {
var v CronVisitor
v.cronStartTime = nil
v.cronEndTime = nil
v.count = defaultListNextScheduleCount
for _, op := range ops {
op(&v)
}
return &v
}
type CronVisitorOption func(*CronVisitor)
func WithCronStartEndTime(cronStartTime, cronEndTime *time.Time) CronVisitorOption {
return func(v *CronVisitor) {
v.cronStartTime = cronStartTime
v.cronEndTime = cronEndTime
}
}
func WithListNextScheduleCount(count int) CronVisitorOption {
return func(v *CronVisitor) {
v.count = count
}
}
func (v *CronVisitor) Visit(s *Spec) {
if s.Cron == "" {
s.CronCompensator = nil
v.isCron = false
return
}
v.isCron = true
var (
schedule cron.Schedule
err error
)
switch fields := strings.Fields(s.Cron); len(fields) {
case 7:
fieldsWithoutYear := fields[:len(fields)-1]
s.Cron = strings.Join(fieldsWithoutYear, " ")
fallthrough
case 6:
schedule, err = cron.Parse(s.Cron)
default:
schedule, err = cron.ParseStandard(s.Cron)
}
if err != nil {
s.appendError(err)
return
}
now := time.Unix(time.Now().Unix(), 0)
scheduleFrom := now
if v.cronStartTime != nil {
scheduleFrom = *v.cronStartTime
}
for {
if len(v.nextTimes) >= maxListNextScheduleCount {
break
}
if v.count >= 0 && len(v.nextTimes) >= v.count {
break
}
nextTime := schedule.Next(scheduleFrom)
if v.cronEndTime != nil && (*v.cronEndTime).Before(nextTime) {
break
}
v.nextTimes = append(v.nextTimes, nextTime)
scheduleFrom = nextTime
}
}
func ListNextCronTime(cronExpr string, ops ...CronVisitorOption) ([]time.Time, error) {
s := Spec{Cron: cronExpr}
v := NewCronVisitor(ops...)
s.Accept(v)
return v.nextTimes, s.mergeErrors()
}
func IsCron(s *Spec) bool {
v := NewCronVisitor(nil, nil)
s.Accept(v)
return v.isCron
}