Limit download speed to not kill internet

downloader/main.go

@@ -43,13 +43,20 @@ func main() {
 	ws.url = WEBSOCKET_SERVER
 	ws.Open()
 
-	status := make(chan error, 16)
+	sem := make(chan struct{}, 4)
 	for {
 		select {
 		case event := <-ws.ReadChan:
 			eventCopy := event
-			log.Printf("New event: %+v", eventCopy)
+			status := make(chan error)
+			sem <- struct{}{}
+			
+			log.Printf("New event: %+v; semaphore at: %d", eventCopy, len(sem))
 			go func() {
+				defer func() {
+					<-sem
+					log.Printf("Semaphore at: %d", len(sem))
+				}()
 				// Download(eventCopy, status)
 				DownloadURL(eventCopy, status)
 				// go DownloadNative(event, status)