dfget&&supernode: cleanup code based on staticcheck warnings

Signed-off-by: hwdef <[email protected]>

dfget/core/api/supernode_api_test.go

@@ -129,28 +129,28 @@ func (s *SupernodeAPITestSuite) TestSupernodeAPI_get(c *check.C) {
 	}
 
 	api := s.api.(*supernodeAPI)
-	f := func(code int, res string, e error) (*testRes, error, string) {
+	f := func(code int, res string, e error) (*testRes, string, error) {
 		s.mock.GetFunc = s.mock.CreateGetFunc(code, []byte(res), e)
 		msg := fmt.Sprintf("code:%d res:%s e:%v", code, res, e)
 		resp := new(testRes)
 		err := api.get("http://localhost", resp)
-		return resp, err, msg
+		return resp, msg, err
 	}
 
-	r, e, m := f(0, "test", nil)
+	r, m, e := f(0, "test", nil)
 	c.Assert(r.A, check.Equals, 0, check.Commentf(m))
 	c.Assert(e.Error(), check.Equals, "0:test", check.Commentf(m))
 
-	r, e, m = f(0, "x", fmt.Errorf("test error"))
+	r, m, e = f(0, "x", fmt.Errorf("test error"))
 	c.Assert(r.A, check.Equals, 0, check.Commentf(m))
 	c.Assert(e.Error(), check.Equals, "test error", check.Commentf(m))
 
-	r, e, m = f(200, "x", nil)
+	r, m, e = f(200, "x", nil)
 	c.Assert(r.A, check.Equals, 0, check.Commentf(m))
 	c.Assert(strings.Contains(e.Error(), "invalid character"),
 		check.Equals, true, check.Commentf(m))
 
-	r, e, m = f(200, `{"A":1}`, nil)
+	r, m, e = f(200, `{"A":1}`, nil)
 	c.Assert(r.A, check.Equals, 1, check.Commentf(m))
 	c.Assert(e, check.IsNil, check.Commentf(m))
 

dfget/core/downloader/p2p_downloader/power_client.go

@@ -140,7 +140,7 @@ func (pc *PowerClient) downloadPiece() (content *bytes.Buffer, e error) {
 	if pc.total, e = content.ReadFrom(limitReader); e != nil {
 		return nil, e
 	}
-	pc.readCost = time.Now().Sub(startTime)
+	pc.readCost = time.Since(startTime)
 
 	// Verify md5 code
 	if realMd5 := limitReader.Md5(); realMd5 != pieceMD5 {

dfget/core/uploader/peer_server.go

@@ -448,7 +448,6 @@ func (ps *peerServer) waitForShutdown() {
 	if ps.finished == nil {
 		return
 	}
-
 	for {
 		select {
 		case _, notClose := <-ps.finished:

supernode/daemon/mgr/pieceerror/manager.go

@@ -70,7 +70,7 @@ type Manager struct {
 func NewManager(cfg *config.Config, gcManager mgr.GCMgr, cdnManager mgr.CDNMgr) (*Manager, error) {
 	return &Manager{
 		cfg:                cfg,
-		handlers:           make(map[string]Handler, 0),
+		handlers:           make(map[string]Handler),
 		gcManager:          gcManager,
 		cdnManager:         cdnManager,
 		pieceErrChan:       make(chan *types.PieceErrorRequest, ErrHandlerChanSize),