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scheduler.go
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scheduler.go
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package scheduler
import (
"fmt"
"github.com/robfig/cron/v3"
"github.com/rymdo/kube-cron-rollout-restart/v2/src/types"
)
type Entry struct {
Id cron.EntryID
Job types.Job
}
type OnExecute func(job types.Job)
type Scheduler struct {
cron *cron.Cron
entries []Entry
onExecute OnExecute
}
func New(onExecute OnExecute) Scheduler {
scheduler := Scheduler{
cron: cron.New(),
onExecute: onExecute,
}
scheduler.cron.Start()
return scheduler
}
func (s *Scheduler) AddJob(job types.Job) {
if s.JobExists(job) {
return
}
fmt.Printf("Scheduler: Adding job %+v\n", job)
id, err := s.cron.AddFunc(job.Schedule, func() {
fmt.Printf("Scheduler: Executing job %+v\n", job)
s.onExecute(job)
})
if err != nil {
fmt.Printf("Scheduler: Failed to add cron for job %+v\n", job)
fmt.Println(err.Error())
return
}
entry := Entry{
Id: id,
Job: job,
}
s.entries = append(s.entries, entry)
}
func (s *Scheduler) RemoveJob(job types.Job) {
fmt.Printf("Scheduler: Removing job %+v\n", job)
for i, entry := range s.entries {
if jobsEqual(entry.Job, job) {
s.cron.Remove(entry.Id)
s.entries = append(s.entries[:i], s.entries[i+1:]...)
}
}
}
func (s *Scheduler) JobExists(job types.Job) bool {
for _, entry := range s.entries {
if jobsEqual(entry.Job, job) {
return true
}
}
return false
}
func (s *Scheduler) SyncJobs(jobs []types.Job) {
// Add missing jobs
for _, job := range jobs {
if !s.JobExists(job) {
s.AddJob(job)
}
}
// Clear missing jobs
toRemove := []types.Job{}
for _, entry := range s.entries {
if !containsJob(jobs, entry.Job) {
toRemove = append(toRemove, entry.Job)
}
}
for _, job := range toRemove {
s.RemoveJob(job)
}
}
func jobsEqual(a types.Job, b types.Job) bool {
if a.Namespace != b.Namespace {
return false
}
if a.Workload != b.Workload {
return false
}
if a.Schedule != b.Schedule {
return false
}
return true
}
func containsJob(jobs []types.Job, targetJob types.Job) bool {
for _, job := range jobs {
if jobsEqual(job, targetJob) {
return true
}
}
return false
}