first commit

pkg/downloader/event.go

@@ -0,0 +1,19 @@
+package downloader
+
+type EventKey string
+
+const (
+	EventKeyStart    EventKey = "start"
+	EventKeyPause    EventKey = "pause"
+	EventKeyContinue EventKey = "continue"
+	EventKeyProgress EventKey = "progress"
+	EventKeyError    EventKey = "error"
+	EventKeyDone     EventKey = "done"
+	EventKeyFinally  EventKey = "finally"
+)
+
+type Event struct {
+	Key  EventKey
+	Task *TaskInfo
+	Err  error
+}