fixed potential race condition

server/rx/extensions.go

@@ -6,12 +6,20 @@ import "time"
 //
 // Debounce emits the most recently emitted value from the source
 // withing the timespan set by the span time.Duration
-func Sample[T any](span time.Duration, source chan T, done chan struct{}, fn func(e T)) {
+func Sample(span time.Duration, source chan []byte, done chan struct{}, fn func(e []byte)) {
-	ticker := time.NewTicker(span)
+	var (
+		item   []byte
+		ticker = time.NewTicker(span)
+	)
+
 	for {
 		select {
 		case <-ticker.C:
-			fn(<-source)
+			if item != nil {
+				fn(item)
+			}
+		case <-source:
+			item = <-source
 		case <-done:
 			ticker.Stop()
 			return