Started working on the event bus

providers/bus/bus.go

@@ -0,0 +1,64 @@
+package bus
+
+import (
+	"container/list"
+	"lmika.dev/lmika/hugo-cms/models"
+)
+
+type Bus struct {
+	subs       *list.List
+	eventQueue chan models.Event
+}
+
+func New() *Bus {
+	return &Bus{
+		subs:       list.New(),
+		eventQueue: make(chan models.Event, 20),
+	}
+}
+
+func (b *Bus) Fire(event models.Event) {
+	b.eventQueue <- event
+}
+
+func (b *Bus) Start() {
+	go func() {
+		for e := range b.eventQueue {
+			switch e.Type {
+			case models.EventTypeSubscribe:
+				retChan := e.Data.(chan *models.Sub)
+
+				newSub := &models.Sub{C: make(chan models.Event, 1)}
+				newSub.Elem = b.subs.PushBack(newSub)
+
+				retChan <- newSub
+			case models.EventTypeUnsubscribe:
+				sub := e.Data.(*models.Sub)
+				close(sub.C)
+				b.subs.Remove(sub.Elem)
+			default:
+				for f := b.subs.Front(); f != nil; f = f.Next() {
+					sub := f.Value.(*models.Sub)
+					select {
+					case sub.C <- e:
+					default:
+					}
+				}
+			}
+		}
+	}()
+}
+
+func (b *Bus) Stop() {
+	close(b.eventQueue)
+}
+
+func (b *Bus) Subscribe() *models.Sub {
+	resChan := make(chan *models.Sub)
+	b.eventQueue <- models.Event{Type: models.EventTypeSubscribe, Data: resChan}
+	return <-resChan
+}
+
+func (b *Bus) Unsubscribe(sub *models.Sub) {
+	b.eventQueue <- models.Event{Type: models.EventTypeUnsubscribe, Data: sub}
+}