run golangci-lint and apply suggested fixes

2019-03-22 20:45:27 +01:00
parent afed762774
commit 5b97953bfb
67 changed files with 413 additions and 353 deletions
@@ -13,6 +13,7 @@ func init() {
 	}
 }

+//nolint[:deadcode,unused]
 func debug(format string, args ...interface{}) {
 	if debugEnabled {
 		fmt.Fprintf(os.Stderr, "rpc/dataconn: %s\n", fmt.Sprintf(format, args...))
@@ -138,7 +138,6 @@ func (s *Server) serveConn(nc *transport.AuthConn) {
 	default:
 		s.log.WithField("endpoint", endpoint).Error("unknown endpoint")
 		handlerErr = fmt.Errorf("requested endpoint does not exist")
-		return
 	}

 	s.log.WithField("endpoint", endpoint).WithField("errType", fmt.Sprintf("%T", handlerErr)).Debug("handler returned")
@@ -188,6 +187,4 @@ func (s *Server) serveConn(nc *transport.AuthConn) {
 			s.log.WithError(err).Error("cannot write send stream")
 		}
 	}
-
-	return
 }
@@ -1,7 +1,6 @@
 package frameconn

 import (
-	"bufio"
 	"encoding/binary"
 	"errors"
 	"fmt"
@@ -48,7 +47,6 @@ func (f *FrameHeader) Unmarshal(buf []byte) {
 type Conn struct {
 	readMtx, writeMtx sync.Mutex
 	nc                timeoutconn.Conn
-	ncBuf             *bufio.ReadWriter
 	readNextValid     bool
 	readNext          FrameHeader
 	nextReadErr       error
@@ -10,17 +10,11 @@ type shutdownFSM struct {
 type shutdownFSMState uint32

 const (
+	// zero value is important
 	shutdownStateOpen shutdownFSMState = iota
 	shutdownStateBegin
 )

-func newShutdownFSM() *shutdownFSM {
-	fsm := &shutdownFSM{
-		state: shutdownStateOpen,
-	}
-	return fsm
-}
-
 func (f *shutdownFSM) Begin() (thisCallStartedShutdown bool) {
 	f.mtx.Lock()
 	defer f.mtx.Unlock()
@@ -11,9 +11,7 @@ import (
 )

 type Conn struct {
-	state state
-	// if not nil, opErr is returned for ReadFrame and WriteFrame (not for Close, though)
-	opErr                 atomic.Value // error
+	state                 state
 	fc                    *frameconn.Conn
 	sendInterval, timeout time.Duration
 	stopSend              chan struct{}
@@ -97,7 +95,10 @@ func (c *Conn) sendHeartbeats() {
 				debug("send heartbeat")
 				// if the connection is in zombie mode (aka iptables DROP inbetween peers)
 				// this call or one of its successors will block after filling up the kernel tx buffer
-				c.fc.WriteFrame([]byte{}, heartbeat)
+				err := c.fc.WriteFrame([]byte{}, heartbeat)
+				if err != nil {
+					debug("send heartbeat error: %s", err)
+				}
 				// ignore errors from WriteFrame to rate-limit SendHeartbeat retries
 				c.lastFrameSent.Store(time.Now())
 			}()
@@ -13,6 +13,7 @@ func init() {
 	}
 }

+//nolint[:deadcode,unused]
 func debug(format string, args ...interface{}) {
 	if debugEnabled {
 		fmt.Fprintf(os.Stderr, "rpc/dataconn/heartbeatconn: %s\n", fmt.Sprintf(format, args...))
@@ -28,6 +28,7 @@ func WithLogger(ctx context.Context, log Logger) context.Context {
 	return context.WithValue(ctx, contextKeyLogger, log)
 }

+//nolint[:deadcode,unused]
 func getLog(ctx context.Context) Logger {
 	log, ok := ctx.Value(contextKeyLogger).(Logger)
 	if !ok {
@@ -23,9 +23,8 @@ type Conn struct {

 	// readMtx serializes read stream operations because we inherently only
 	// support a single stream at a time over hc.
-	readMtx            sync.Mutex
-	readClean          bool
-	allowWriteStreamTo bool
+	readMtx   sync.Mutex
+	readClean bool

 	// writeMtx serializes write stream operations because we inherently only
 	// support a single stream at a time over hc.
@@ -95,7 +94,7 @@ func (c *Conn) ReadStreamedMessage(ctx context.Context, maxSize uint32, frameTyp
 	}()
 	err := readStream(c.frameReads, c.hc, w, frameType)
 	c.readClean = isConnCleanAfterRead(err)
-	w.CloseWithError(readMessageSentinel)
+	_ = w.CloseWithError(readMessageSentinel) // always returns nil
 	wg.Wait()
 	if err != nil {
 		return nil, err
@@ -166,7 +165,7 @@ func (c *Conn) SendStream(ctx context.Context, src zfs.StreamCopier, frameType u
 		var res writeStreamRes
 		res.errStream, res.errConn = writeStream(ctx, c.hc, r, frameType)
 		if w != nil {
-			w.CloseWithError(res.errStream)
+			_ = w.CloseWithError(res.errStream) // always returns nil
 		}
 		writeStreamErrChan <- res
 	}()
@@ -13,6 +13,7 @@ func init() {
 	}
 }

+//nolint[:deadcode,unused]
 func debug(format string, args ...interface{}) {
 	if debugEnabled {
 		fmt.Fprintf(os.Stderr, "rpc/dataconn/stream: %s\n", fmt.Sprintf(format, args...))
@@ -52,9 +52,6 @@ func (CloseWrite) sender(wire transport.Wire) {
 		log.Printf("closeErr=%T %s", closeErr, closeErr)
 	}()

-	type opResult struct {
-		err error
-	}
 	writeDone := make(chan struct{}, 1)
 	go func() {
 		close(writeDone)
@@ -95,7 +95,7 @@ restart:
 		return n, err
 	}
 	var nCurRead int
-	nCurRead, err = c.Wire.Read(p[n:len(p)])
+	nCurRead, err = c.Wire.Read(p[n:])
 	n += nCurRead
 	if netErr, ok := err.(net.Error); ok && netErr.Timeout() && nCurRead > 0 {
 		err = nil
@@ -111,7 +111,7 @@ restart:
 		return n, err
 	}
 	var nCurWrite int
-	nCurWrite, err = c.Wire.Write(p[n:len(p)])
+	nCurWrite, err = c.Wire.Write(p[n:])
 	n += nCurWrite
 	if netErr, ok := err.(net.Error); ok && netErr.Timeout() && nCurWrite > 0 {
 		err = nil
@@ -102,7 +102,7 @@ func TestNoPartialReadsDueToDeadline(t *testing.T) {
 		// io.Copy will encounter a partial read, then wait ~50ms until the other 5 bytes are written
 		// It is still going to fail with deadline err because it expects EOF
 		n, err := io.Copy(&buf, bc)
-		readDuration := time.Now().Sub(beginRead)
+		readDuration := time.Since(beginRead)
 		t.Logf("read duration=%s", readDuration)
 		t.Logf("recv done n=%v err=%v", n, err)
 		t.Logf("buf=%v", buf.Bytes())
@@ -153,7 +153,7 @@ func TestPartialWriteMockConn(t *testing.T) {
 	buf := []byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
 	begin := time.Now()
 	n, err := mc.Write(buf[:])
-	duration := time.Now().Sub(begin)
+	duration := time.Since(begin)
 	assert.NoError(t, err)
 	assert.Equal(t, 5, n)
 	assert.True(t, duration > 100*time.Millisecond)