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timers.go
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timers.go
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package flow
import (
"fmt"
"log/slog"
"os"
"strings"
"sync"
"time"
"github.com/direktiv/direktiv/pkg/flow/pubsub"
"github.com/robfig/cron/v3"
)
const (
wfCron = "wfcron"
)
const (
timerTypeCron = iota
timerTypeOneShot
)
type timers struct {
mtx sync.Mutex
cron *cron.Cron
fns map[string]func([]byte)
timers map[string]*timer
pubsub *pubsub.Pubsub
hostname string
}
func initTimers(pubsub *pubsub.Pubsub) (*timers, error) {
timers := new(timers)
timers.fns = make(map[string]func([]byte))
timers.cron = cron.New()
timers.timers = make(map[string]*timer) // timers can be key as name because it is unique
timers.pubsub = pubsub
var err error
timers.hostname, err = os.Hostname()
if err != nil {
return nil, err
}
go timers.cron.Start()
return timers, nil
}
func (timers *timers) Close() error {
timers.stopTimers()
return nil
}
type timer struct {
timerType int
name string
data []byte
fn func([]byte)
cron struct {
pattern string
cronID cron.EntryID
}
oneshot struct {
time *time.Time
timer *time.Timer
}
}
// stopTimers stops crons and one-shots.
func (timers *timers) stopTimers() {
ctx := timers.cron.Stop()
<-ctx.Done()
timers.mtx.Lock()
defer timers.mtx.Unlock()
for _, timer := range timers.timers {
timers.disableTimer(timer)
}
}
func (timers *timers) prepDisableTimer(timer *timer) string {
switch timer.timerType {
case timerTypeOneShot:
// only if the timer had been setup
if timer.oneshot.timer != nil {
timer.oneshot.timer.Stop()
}
case timerTypeCron:
timers.cron.Remove(timer.cron.cronID)
default:
fmt.Fprintf(os.Stderr, "%v\n", fmt.Errorf("unknown timer type"))
}
return timer.name
}
// must be locked before calling.
func (timers *timers) disableTimer(timer *timer) {
name := timers.prepDisableTimer(timer)
delete(timers.timers, name)
}
func (timers *timers) executeFunction(timer *timer) {
timer.fn(timer.data)
if timer.timerType == timerTypeOneShot {
timers.mtx.Lock()
defer timers.mtx.Unlock()
timers.disableTimer(timer)
}
}
func (timers *timers) newTimer(name, fn string, data []byte, time *time.Time, pattern string) (*timer, error) {
timers.mtx.Lock()
defer timers.mtx.Unlock()
exeFn, ok := timers.fns[fn]
if !ok {
return nil, fmt.Errorf("can not add timer %s, invalid function %s", name, fn)
}
timer := new(timer)
timer.timerType = timerTypeOneShot
timer.oneshot.time = time
timer.fn = exeFn
timer.name = name
timer.data = data
if time == nil || time.IsZero() {
timer.timerType = timerTypeCron
timer.cron.pattern = pattern
}
timers.timers[name] = timer
return timer, nil
}
// registerFunction adds functions which can be executed by one-shots or crons.
func (timers *timers) registerFunction(name string, fn func([]byte)) {
timers.mtx.Lock()
defer timers.mtx.Unlock()
if _, ok := timers.fns[name]; ok {
panic(fmt.Errorf("function already exists"))
}
timers.fns[name] = fn
}
func (timers *timers) addCron(name, fn, pattern string, data []byte) error {
timers.deleteCronForWorkflow(name)
name = fmt.Sprintf("cron:%s", name)
slog.Debug("Scheduling new cron job.", "cron_name", name, "cron_pattern", pattern)
// check if cron pattern matches
c := cron.NewParser(cron.Minute | cron.Hour | cron.Dom |
cron.Month | cron.DowOptional | cron.Descriptor)
_, err := c.Parse(pattern)
if err != nil {
return err
}
t, err := timers.newTimer(name, fn, data, nil, pattern)
if err != nil {
return err
}
id, err := timers.cron.AddFunc(t.cron.pattern, func() {
timers.executeFunction(t)
})
if err != nil {
return fmt.Errorf("can not enable timer %s: %w", name, err)
}
t.cron.cronID = id
timers.mtx.Lock()
defer timers.mtx.Unlock()
timers.timers[name] = t
return nil
}
func (timers *timers) addOneShot(name, fn string, timeos time.Time, data []byte) error {
utc := timeos.UTC()
t, err := timers.newTimer(name, fn, data, &utc, "")
if err != nil {
return err
}
duration := t.oneshot.time.UTC().Sub(time.Now().UTC())
if duration < 0 {
return fmt.Errorf("one-shot %s is in the past", t.name)
}
err = func(timer *timer, duration time.Duration) error {
clock := time.AfterFunc(duration, func() {
timers.executeFunction(timer)
})
timer.oneshot.timer = clock
return nil
}(t, duration)
if err != nil {
return err
}
return nil
}
func (timers *timers) deleteTimersForInstance(name string) {
timers.pubsub.ClusterDeleteInstanceTimers(name)
}
func (timers *timers) deleteTimersForInstanceNoBroadcast(name string) {
var keys []string
timers.mtx.Lock()
defer timers.mtx.Unlock()
delT := func(pattern, name string) {
for _, n := range timers.timers {
if strings.HasPrefix(n.name, fmt.Sprintf(pattern, name)) {
key := timers.prepDisableTimer(n)
keys = append(keys, key)
}
}
}
patterns := []string{
"timeout:%s",
"%s",
}
for _, p := range patterns {
delT(p, name)
}
for _, key := range keys {
delete(timers.timers, key)
}
}
func (timers *timers) deleteTimersForActivityNoBroadcast(name string) {
var keys []string
timers.mtx.Lock()
defer timers.mtx.Unlock()
delT := func(pattern, name string) {
for _, n := range timers.timers {
if strings.HasPrefix(n.name, fmt.Sprintf(pattern, name)) {
key := timers.prepDisableTimer(n)
keys = append(keys, key)
}
}
}
patterns := []string{
"timeout:%s",
"%s",
}
for _, p := range patterns {
delT(p, name)
}
for _, key := range keys {
delete(timers.timers, key)
}
}
func (timers *timers) deleteInstanceTimersHandler(req *pubsub.PubsubUpdate) {
timers.deleteTimersForInstanceNoBroadcast(req.Key)
}
func (timers *timers) deleteActivityTimersHandler(req *pubsub.PubsubUpdate) {
timers.deleteTimersForActivityNoBroadcast(req.Key)
}
func (timers *timers) deleteTimerHandler(req *pubsub.PubsubUpdate) {
timers.deleteTimerByName("", timers.pubsub.Hostname, req.Key)
}
func (timers *timers) deleteTimerByName(oldController, newController, name string) {
if oldController != newController && oldController != "" {
// send delete to specific server
timers.pubsub.HostnameDeleteTimer(oldController, name)
return
}
// delete local timer
var key string
timers.mtx.Lock()
if timer, ok := timers.timers[name]; ok {
key = timers.prepDisableTimer(timer)
}
delete(timers.timers, key)
timers.mtx.Unlock()
if newController == "" {
timers.pubsub.ClusterDeleteTimer(name)
}
}
func (timers *timers) deleteCronForWorkflow(id string) {
timers.deleteTimerByName("", timers.hostname, fmt.Sprintf("cron:%s", id))
}