139 lines
2.6 KiB
Go
139 lines
2.6 KiB
Go
package nats
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import (
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"errors"
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"time"
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"github.com/nats-io/nats.go/jetstream"
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)
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var (
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timerStore jetstream.KeyValue
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ticker *time.Ticker
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)
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func TimerStoreConnect() error {
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if client.JS == nil {
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return errors.New("jetstream must be connected first")
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}
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logger.Debug("Looking for KV store")
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listener := client.JS.KeyValueStoreNames(ctx)
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found := false
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for name := range listener.Name() {
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if name == "KV_hats_timers" {
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found = true
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}
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}
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var err error
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if found {
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logger.Debug("Connecting to Timers KV store")
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timerStore, err = client.JS.KeyValue(ctx, "hats_timers")
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} else {
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logger.Debug("Creating Timers KV store")
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timerStore, err = client.JS.CreateKeyValue(ctx, jetstream.KeyValueConfig{
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Bucket: "hats_timers",
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})
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}
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return err
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}
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type HatsTimer struct {
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Name string
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Duration time.Duration
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NextActivation time.Time
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}
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func NewTimerWithDuration(name, duration string) *HatsTimer {
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t := &HatsTimer{
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Name: name,
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}
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d, err := time.ParseDuration(duration)
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if err != nil {
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d = 5 * time.Minute
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}
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t.Duration = d
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return t.CalculateNext()
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}
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func NewTimerWithActivation(name string, activation []byte) (*HatsTimer, error) {
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t := &HatsTimer{
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Name: name,
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Duration: 5 * time.Minute,
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}
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a, err := time.Parse(time.RFC3339, string(activation))
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if err != nil {
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return t.CalculateNext(), err
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}
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t.NextActivation = a
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return t, nil
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}
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func GetTimer(name string) (*HatsTimer, error) {
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value, err := timerStore.Get(ctx, name)
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if err != nil {
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return nil, err
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}
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return NewTimerWithActivation(name, value.Value())
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}
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func (t *HatsTimer) CalculateNext() *HatsTimer {
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t.NextActivation = time.Now().Add(t.Duration)
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return t
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}
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func (t *HatsTimer) Marshall() []byte {
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timestamp, _ := t.NextActivation.MarshalText()
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return timestamp
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}
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func (t *HatsTimer) Activate() {
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timerStore.Put(ctx, t.Name, t.Marshall())
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}
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func (t *HatsTimer) ActivateIfNotAlready() {
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timerStore.Create(ctx, t.Name, t.Marshall())
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}
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func (t *HatsTimer) Cancel() {
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timerStore.Purge(ctx, t.Name)
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}
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func (t *HatsTimer) End() {
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t.Cancel()
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PublishString("timers."+t.Name, "done")
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}
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func WatchTimers() {
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ticker = time.NewTicker(time.Second)
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for {
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t := <-ticker.C
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timers, _ := timerStore.Keys(ctx, jetstream.IgnoreDeletes())
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for _, timerName := range timers {
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timer, err := GetTimer(timerName)
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if err != nil {
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logger.Error("Error retrieving timer", "timer", timerName, "error", err)
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timer.Cancel()
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continue
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}
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if t.After(timer.NextActivation) {
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timer.End()
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}
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}
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}
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}
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func StopTimers() {
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if ticker != nil {
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ticker.Stop()
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}
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}
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