fix: tasks block when paused while not ready (#648)

pkg/download/downloader.go

@@ -362,18 +362,10 @@ func (d *Downloader) Pause(id string) (err error) {
 		return ErrTaskNotFound
 	}
 
-	func() {
-		task.lock.Lock()
-		defer task.lock.Unlock()
-
-		if task.Status == base.DownloadStatusPause {
-			return
-		}
-		if err = d.doPause(task); err != nil {
-			return
-		}
-		d.notifyRunning()
-	}()
+	if err = d.doPause(task); err != nil {
+		return
+	}
+	d.notifyRunning()
 	return
 }
 
@@ -592,11 +584,11 @@ func (d *Downloader) Close() error {
 
 	closeArr := []func() error{
 		d.PauseAll,
-		d.storage.Close,
 	}
 	for _, fm := range d.cfg.FetchManagers {
 		closeArr = append(closeArr, fm.Close)
 	}
+	closeArr = append(closeArr, d.storage.Close)
 	// Make sure all resources are released, if had error, return the last error
 	var lastErr error
 	for i, close := range closeArr {
@@ -732,6 +724,12 @@ func (d *Downloader) watch(task *Task) {
 		d.doOnError(task, err)
 		return
 	}
+
+	// When delete a not resolved task, need check if the task resource is nil
+	if task.Meta.Res == nil {
+		return
+	}
+
 	task.Progress.Used = task.timer.Used()
 	if task.Meta.Res.Size == 0 {
 		task.Meta.Res.Size = task.fetcher.Progress().TotalDownloaded()