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common.go
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/
common.go
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/*
Copyright 2023 The Kapacity Authors.
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 provider
import (
"context"
"fmt"
"sync"
"time"
"github.com/mitchellh/hashstructure/v2"
"github.com/robfig/cron/v3"
"k8s.io/apimachinery/pkg/types"
"sigs.k8s.io/controller-runtime/pkg/event"
autoscalingv1alpha1 "github.com/traas-stack/kapacity/apis/autoscaling/v1alpha1"
"github.com/traas-stack/kapacity/pkg/util"
)
type cronTask struct {
Hash uint64
Crontabs []*cron.Cron
}
func (c *cronTask) Stop() {
for _, crontab := range c.Crontabs {
crontab.Stop()
}
}
func (c *cronTask) Start() {
for _, crontab := range c.Crontabs {
crontab.Start()
}
}
type cronTaskTriggerManager struct {
cronTaskMap sync.Map // map[types.NamespacedName]*cronTask
eventTrigger chan event.GenericEvent
}
func newCronTaskTriggerManager(eventTrigger chan event.GenericEvent) *cronTaskTriggerManager {
return &cronTaskTriggerManager{
eventTrigger: eventTrigger,
}
}
func (m *cronTaskTriggerManager) StartCronTaskTrigger(taskKey types.NamespacedName, ihpa *autoscalingv1alpha1.IntelligentHorizontalPodAutoscaler, crons []autoscalingv1alpha1.ReplicaCron) error {
hash, err := hashstructure.Hash(crons, hashstructure.FormatV2, nil)
if err != nil {
return fmt.Errorf("failed to hash crons: %v", err)
}
taskV, ok := m.cronTaskMap.Load(taskKey)
if ok {
task := taskV.(*cronTask)
if hash == task.Hash {
return nil
}
task.Stop()
m.cronTaskMap.Delete(taskKey)
}
task := &cronTask{
Hash: hash,
Crontabs: make([]*cron.Cron, 0, len(crons)),
}
for _, cronData := range crons {
location, err := time.LoadLocation(cronData.TimeZone)
if err != nil {
return fmt.Errorf("failed to load time zone of cron %q: %v", cronData.Name, err)
}
ihpaEvent := event.GenericEvent{Object: ihpa}
crontab := cron.New(cron.WithLocation(location))
if _, err := crontab.AddFunc(cronData.Start, func() {
m.eventTrigger <- ihpaEvent
}); err != nil {
return fmt.Errorf("failed to add crontab start function of cron %q: %v", cronData.Name, err)
}
if _, err := crontab.AddFunc(cronData.End, func() {
m.eventTrigger <- ihpaEvent
}); err != nil {
return fmt.Errorf("failed to add crontab end function of cron %q: %v", cronData.Name, err)
}
task.Crontabs = append(task.Crontabs, crontab)
}
m.cronTaskMap.Store(taskKey, task)
task.Start()
return nil
}
func (m *cronTaskTriggerManager) StopCronTaskTrigger(taskKey types.NamespacedName) {
taskV, ok := m.cronTaskMap.Load(taskKey)
if ok {
task := taskV.(*cronTask)
task.Stop()
m.cronTaskMap.Delete(taskKey)
}
}
func getActiveReplicaCron(crons []autoscalingv1alpha1.ReplicaCron) (*autoscalingv1alpha1.ReplicaCron, time.Time, error) {
var (
active *autoscalingv1alpha1.ReplicaCron
expireTime time.Time
)
now := time.Now()
for i := range crons {
rc := &crons[i]
location, err := time.LoadLocation(rc.TimeZone)
if err != nil {
return nil, time.Time{}, fmt.Errorf("failed to load time zone of cron %q: %v", rc.Name, err)
}
t := now.In(location)
isActive, cronExpireTime, err := util.IsCronActive(t, rc.Start, rc.End)
if err != nil {
return nil, time.Time{}, fmt.Errorf("failed to check active for cron %q: %v", rc.Name, err)
}
if isActive {
if active != nil {
return nil, time.Time{}, fmt.Errorf("found overlapping cron %q and %q", active.Name, rc.Name)
}
active = rc
expireTime = cronExpireTime
}
}
return active, expireTime, nil
}
type timerCanceller struct {
T time.Time
Cancel context.CancelFunc
}
type timerTriggerManager struct {
timerCancellerMap sync.Map // map[types.NamespacedName]*timerCanceller
eventTrigger chan event.GenericEvent
}
func newTimerTriggerManager(eventTrigger chan event.GenericEvent) *timerTriggerManager {
return &timerTriggerManager{
eventTrigger: eventTrigger,
}
}
func (m *timerTriggerManager) StartTimerTrigger(ctx context.Context, timerKey types.NamespacedName, ihpa *autoscalingv1alpha1.IntelligentHorizontalPodAutoscaler, t time.Time) {
cancellerV, ok := m.timerCancellerMap.Load(timerKey)
if ok {
canceller := cancellerV.(*timerCanceller)
if t.Equal(canceller.T) {
return
}
canceller.Cancel()
m.timerCancellerMap.Delete(timerKey)
}
timerContext, cancel := context.WithCancel(ctx)
m.timerCancellerMap.Store(timerKey, &timerCanceller{
T: t,
Cancel: cancel,
})
go func() {
d := time.Until(t)
if d <= 0 {
m.eventTrigger <- event.GenericEvent{Object: ihpa}
return
}
timer := time.NewTimer(d)
select {
case <-timer.C:
m.eventTrigger <- event.GenericEvent{Object: ihpa}
case <-timerContext.Done():
timer.Stop()
}
}()
}
func (m *timerTriggerManager) StopTimerTrigger(timerKey types.NamespacedName) {
cancellerV, ok := m.timerCancellerMap.Load(timerKey)
if ok {
canceller := cancellerV.(*timerCanceller)
canceller.Cancel()
m.timerCancellerMap.Delete(timerKey)
}
}