10 playlist download (#71)

* leveraging message queue for playlist entries DL

* playlist support implemented

It's a little bit slow but solid enough :D

server/internal/message_queue.go

@@ -30,7 +30,15 @@ func NewMessageQueue() *MessageQueue {
 
 // Publish a message to the queue and set the task to a peding state.
 func (m *MessageQueue) Publish(p *Process) {
-	go p.SetPending()
+	p.SetPending()
+	go p.SetMetadata()
+	m.producerCh <- p
+}
+
+// Publish a message to the queue and set the task to a peding state.
+// ENSURE P IS PART OF A PLAYLIST
+// Needs a further review
+func (m *MessageQueue) PublishPlaylistEntry(p *Process) {
 	m.producerCh <- p
 }
 
@@ -45,3 +53,13 @@ func (m *MessageQueue) Subscriber() {
 		}(msg)
 	}
 }
+
+// Empties the message queue
+func (m *MessageQueue) Empty() {
+	for range m.producerCh {
+		<-m.producerCh
+	}
+	for range m.consumerCh {
+		<-m.consumerCh
+	}
+}