*: over 20 staticcheck fixes

client/v3/client.go

@@ -348,7 +348,7 @@ func newClient(cfg *Config) (*Client, error) {
 			return nil, fmt.Errorf("gRPC message recv limit (%d bytes) must be greater than send limit (%d bytes)", cfg.MaxCallRecvMsgSize, cfg.MaxCallSendMsgSize)
 		}
 		callOpts := []grpc.CallOption{
-			defaultFailFast,
+			defaultWaitForReady,
 			defaultMaxCallSendMsgSize,
 			defaultMaxCallRecvMsgSize,
 		}

client/v3/lease.go

@@ -238,17 +238,17 @@ func (l *lessor) Revoke(ctx context.Context, id LeaseID) (*LeaseRevokeResponse,
 func (l *lessor) TimeToLive(ctx context.Context, id LeaseID, opts ...LeaseOption) (*LeaseTimeToLiveResponse, error) {
 	r := toLeaseTimeToLiveRequest(id, opts...)
 	resp, err := l.remote.LeaseTimeToLive(ctx, r, l.callOpts...)
-	if err == nil {
-		gresp := &LeaseTimeToLiveResponse{
-			ResponseHeader: resp.GetHeader(),
-			ID:             LeaseID(resp.ID),
-			TTL:            resp.TTL,
-			GrantedTTL:     resp.GrantedTTL,
-			Keys:           resp.Keys,
-		}
-		return gresp, nil
+	if err != nil {
+		return nil, toErr(ctx, err)
 	}
-	return nil, toErr(ctx, err)
+	gresp := &LeaseTimeToLiveResponse{
+		ResponseHeader: resp.GetHeader(),
+		ID:             LeaseID(resp.ID),
+		TTL:            resp.TTL,
+		GrantedTTL:     resp.GrantedTTL,
+		Keys:           resp.Keys,
+	}
+	return gresp, nil
 }
 
 func (l *lessor) Leases(ctx context.Context) (*LeaseLeasesResponse, error) {

client/v3/options.go

@@ -23,10 +23,10 @@ import (
 
 var (
 	// client-side handling retrying of request failures where data was not written to the wire or
-	// where server indicates it did not process the data. gRPC default is default is "FailFast(true)"
-	// but for etcd we default to "FailFast(false)" to minimize client request error responses due to
+	// where server indicates it did not process the data. gRPC default is default is "WaitForReady(false)"
+	// but for etcd we default to "WaitForReady(true)" to minimize client request error responses due to
 	// transient failures.
-	defaultFailFast = grpc.FailFast(false)
+	defaultWaitForReady = grpc.WaitForReady(true)
 
 	// client-side request send limit, gRPC default is math.MaxInt32
 	// Make sure that "client-side send limit < server-side default send/recv limit"
@@ -59,7 +59,11 @@ var (
 // defaultCallOpts defines a list of default "gRPC.CallOption".
 // Some options are exposed to "clientv3.Config".
 // Defaults will be overridden by the settings in "clientv3.Config".
-var defaultCallOpts = []grpc.CallOption{defaultFailFast, defaultMaxCallSendMsgSize, defaultMaxCallRecvMsgSize}
+var defaultCallOpts = []grpc.CallOption{
+	defaultWaitForReady,
+	defaultMaxCallSendMsgSize,
+	defaultMaxCallRecvMsgSize,
+}
 
 // MaxLeaseTTL is the maximum lease TTL value
 const MaxLeaseTTL = 9000000000

pkg/expect/expect.go

@@ -120,8 +120,8 @@ func (ep *ExpectProcess) ExpectFunc(f func(string) bool) (string, error) {
 		}
 	}
 	ep.mu.Unlock()
-	return "", fmt.Errorf("Match not found."+
-		" Set EXPECT_DEBUG for more info Err: %v, last lines:\n%s\n\n",
+	return "", fmt.Errorf("match not found."+
+		" Set EXPECT_DEBUG for more info Err: %v, last lines:\n%s",
 		ep.err, strings.Join(lastLinesBuffer, ""))
 }
 

pkg/transport/listener_opts.go

@@ -36,7 +36,7 @@ func (lo *ListenerOptions) IsSocketOpts() bool {
 	if lo.socketOpts == nil {
 		return false
 	}
-	return lo.socketOpts.ReusePort == true || lo.socketOpts.ReuseAddress == true
+	return lo.socketOpts.ReusePort || lo.socketOpts.ReuseAddress
 }
 
 // IsTLS returns true if listner options includes TLSInfo.
@@ -44,7 +44,7 @@ func (lo *ListenerOptions) IsTLS() bool {
 	if lo.tlsInfo == nil {
 		return false
 	}
-	return lo.tlsInfo.Empty() == false
+	return !lo.tlsInfo.Empty()
 }
 
 // ListenerOption are options which can be applied to the listener.

pkg/transport/sockopt.go

@@ -41,5 +41,5 @@ func getControls(sopts *SocketOpts) Controls {
 }
 
 func (sopts *SocketOpts) Empty() bool {
-	return sopts.ReuseAddress == false && sopts.ReusePort == false
+	return !sopts.ReuseAddress && !sopts.ReusePort
 }

server/etcdserver/raft.go

@@ -461,7 +461,7 @@ func startNode(cfg config.ServerConfig, cl *membership.RaftCluster, ids []types.
 		CheckQuorum:     true,
 		PreVote:         cfg.PreVote,
 	}
-	c.Logger, err = getRaftLogger(cfg)
+	c.Logger, _ = getRaftLogger(cfg)
 
 	if len(peers) == 0 {
 		n = raft.RestartNode(c)

server/mvcc/kvstore.go

@@ -268,7 +268,7 @@ func (s *store) compact(trace *traceutil.Trace, rev int64) (<-chan struct{}, err
 		keep := s.kvindex.Compact(rev)
 		indexCompactionPauseMs.Observe(float64(time.Since(start) / time.Millisecond))
 		if !s.scheduleCompaction(rev, keep) {
-			s.compactBarrier(nil, ch)
+			s.compactBarrier(context.TODO(), ch)
 			return
 		}
 		close(ch)

server/mvcc/watchable_store.go

@@ -356,8 +356,7 @@ func (s *watchableStore) syncWatchers() int {
 	tx.RLock()
 	revs, vs := tx.UnsafeRange(keyBucketName, minBytes, maxBytes, 0)
 	tx.RUnlock()
-	var evs []mvccpb.Event
-	evs = kvsToEvents(s.store.lg, wg, revs, vs)
+	evs := kvsToEvents(s.store.lg, wg, revs, vs)
 
 	var victims watcherBatch
 	wb := newWatcherBatch(wg, evs)

server/proxy/grpcproxy/lease.go

@@ -74,7 +74,7 @@ func NewLeaseProxy(ctx context.Context, c *clientv3.Client) (pb.LeaseServer, <-c
 }
 
 func (lp *leaseProxy) LeaseGrant(ctx context.Context, cr *pb.LeaseGrantRequest) (*pb.LeaseGrantResponse, error) {
-	rp, err := lp.leaseClient.LeaseGrant(ctx, cr, grpc.FailFast(false))
+	rp, err := lp.leaseClient.LeaseGrant(ctx, cr, grpc.WaitForReady(true))
 	if err != nil {
 		return nil, err
 	}

tests/functional/rpcpb/member.go

@@ -186,7 +186,7 @@ func (m *Member) RevHash() (int64, int64, error) {
 
 	mt := pb.NewMaintenanceClient(conn)
 	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
-	resp, err := mt.Hash(ctx, &pb.HashRequest{}, grpc.FailFast(false))
+	resp, err := mt.Hash(ctx, &pb.HashRequest{}, grpc.WaitForReady(true))
 	cancel()
 
 	if err != nil {

tests/functional/tester/checker_lease_expire.go

@@ -189,7 +189,7 @@ func (lc *leaseExpireChecker) check(expired bool, leases map[int64]time.Time) er
 	return nil
 }
 
-// TODO: handle failures from "grpc.FailFast(false)"
+// TODO: handle failures from "grpc.WaitForReady(true)"
 func (lc *leaseExpireChecker) getLeaseByID(ctx context.Context, leaseID int64) (*clientv3.LeaseTimeToLiveResponse, error) {
 	return lc.cli.TimeToLive(
 		ctx,

tests/functional/tester/stresser_key.go

@@ -122,7 +122,7 @@ func (s *keyStresser) run() {
 		// and immediate leader election. Find out what other cases this
 		// could be timed out.
 		sctx, scancel := context.WithTimeout(s.ctx, 10*time.Second)
-		err, modifiedKeys := s.stressTable.choose()(sctx)
+		modifiedKeys, err := s.stressTable.choose()(sctx)
 		scancel()
 		if err == nil {
 			atomic.AddInt64(&s.atomicModifiedKeys, modifiedKeys)
@@ -221,7 +221,7 @@ func (s *keyStresser) ModifiedKeys() int64 {
 	return atomic.LoadInt64(&s.atomicModifiedKeys)
 }
 
-type stressFunc func(ctx context.Context) (err error, modifiedKeys int64)
+type stressFunc func(ctx context.Context) (modifiedKeys int64, err error)
 
 type stressEntry struct {
 	weight float64
@@ -256,13 +256,13 @@ func (st *stressTable) choose() stressFunc {
 }
 
 func newStressPut(cli *clientv3.Client, keySuffixRange, keySize int) stressFunc {
-	return func(ctx context.Context) (error, int64) {
+	return func(ctx context.Context) (int64, error) {
 		_, err := cli.Put(
 			ctx,
 			fmt.Sprintf("foo%016x", rand.Intn(keySuffixRange)),
 			string(randBytes(keySize)),
 		)
-		return err, 1
+		return 1, err
 	}
 }
 
@@ -275,7 +275,7 @@ func newStressTxn(cli *clientv3.Client, keyTxnSuffixRange, txnOps int) stressFun
 }
 
 func writeTxn(cli *clientv3.Client, keys []string, txnOps int) stressFunc {
-	return func(ctx context.Context) (error, int64) {
+	return func(ctx context.Context) (int64, error) {
 		ks := make(map[string]struct{}, txnOps)
 		for len(ks) != txnOps {
 			ks[keys[rand.Intn(len(keys))]] = struct{}{}
@@ -303,7 +303,7 @@ func writeTxn(cli *clientv3.Client, keys []string, txnOps int) stressFunc {
 			Then(thenOps...).
 			Else(elseOps...).
 			Commit()
-		return err, int64(txnOps)
+		return int64(txnOps), err
 	}
 }
 
@@ -319,14 +319,14 @@ func getTxnOps(k, v string) (
 }
 
 func newStressRange(cli *clientv3.Client, keySuffixRange int) stressFunc {
-	return func(ctx context.Context) (error, int64) {
+	return func(ctx context.Context) (int64, error) {
 		_, err := cli.Get(ctx, fmt.Sprintf("foo%016x", rand.Intn(keySuffixRange)))
-		return err, 0
+		return 0, err
 	}
 }
 
 func newStressRangeInterval(cli *clientv3.Client, keySuffixRange int) stressFunc {
-	return func(ctx context.Context) (error, int64) {
+	return func(ctx context.Context) (int64, error) {
 		start := rand.Intn(keySuffixRange)
 		end := start + 500
 		_, err := cli.Get(
@@ -334,19 +334,19 @@ func newStressRangeInterval(cli *clientv3.Client, keySuffixRange int) stressFunc
 			fmt.Sprintf("foo%016x", start),
 			clientv3.WithRange(fmt.Sprintf("foo%016x", end)),
 		)
-		return err, 0
+		return 0, err
 	}
 }
 
 func newStressDelete(cli *clientv3.Client, keySuffixRange int) stressFunc {
-	return func(ctx context.Context) (error, int64) {
+	return func(ctx context.Context) (int64, error) {
 		_, err := cli.Delete(ctx, fmt.Sprintf("foo%016x", rand.Intn(keySuffixRange)))
-		return err, 1
+		return 1, err
 	}
 }
 
 func newStressDeleteInterval(cli *clientv3.Client, keySuffixRange int) stressFunc {
-	return func(ctx context.Context) (error, int64) {
+	return func(ctx context.Context) (int64, error) {
 		start := rand.Intn(keySuffixRange)
 		end := start + 500
 		resp, err := cli.Delete(ctx,
@@ -354,8 +354,8 @@ func newStressDeleteInterval(cli *clientv3.Client, keySuffixRange int) stressFun
 			clientv3.WithRange(fmt.Sprintf("foo%016x", end)),
 		)
 		if err == nil {
-			return nil, resp.Deleted
+			return resp.Deleted, nil
 		}
-		return err, 0
+		return 0, err
 	}
 }

tests/integration/clientv3/concurrency/election_test.go

@@ -68,20 +68,15 @@ func TestResumeElection(t *testing.T) {
 		defer close(respChan)
 		o := e.Observe(ctx)
 		respChan <- nil
-		for {
-			select {
-			case resp, ok := <-o:
-				if !ok {
-					t.Error("Observe() channel closed prematurely")
-				}
-				// Ignore any observations that candidate1 was elected
-				if string(resp.Kvs[0].Value) == "candidate1" {
-					continue
-				}
-				respChan <- &resp
-				return
+		for resp := range o {
+			// Ignore any observations that candidate1 was elected
+			if string(resp.Kvs[0].Value) == "candidate1" {
+				continue
 			}
+			respChan <- &resp
+			return
 		}
+		t.Error("Observe() channel closed prematurely")
 	}()
 
 	// wait until observe goroutine is running

tests/integration/clientv3/kv_test.go

@@ -32,6 +32,7 @@ import (
 	"go.etcd.io/etcd/tests/v3/integration"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
 )
 
 func TestKVPutError(t *testing.T) {
@@ -951,7 +952,7 @@ func TestKVLargeRequests(t *testing.T) {
 			maxCallSendBytesClient: 10 * 1024 * 1024,
 			maxCallRecvBytesClient: 0,
 			valueSize:              10 * 1024 * 1024,
-			expectError:            grpc.Errorf(codes.ResourceExhausted, "trying to send message larger than max "),
+			expectError:            status.Errorf(codes.ResourceExhausted, "trying to send message larger than max "),
 		},
 		{
 			maxRequestBytesServer:  10 * 1024 * 1024,
@@ -965,7 +966,7 @@ func TestKVLargeRequests(t *testing.T) {
 			maxCallSendBytesClient: 10 * 1024 * 1024,
 			maxCallRecvBytesClient: 0,
 			valueSize:              10*1024*1024 + 5,
-			expectError:            grpc.Errorf(codes.ResourceExhausted, "trying to send message larger than max "),
+			expectError:            status.Errorf(codes.ResourceExhausted, "trying to send message larger than max "),
 		},
 	}
 	for i, test := range tests {

tests/integration/clientv3/ordering_kv_test.go

@@ -103,7 +103,6 @@ func TestDetectTxnOrderViolation(t *testing.T) {
 		},
 	}
 	cli, err := clientv3.New(cfg)
-	defer cli.Close()
 	if err != nil {
 		t.Fatal(err)
 	}

tests/integration/cluster.go

@@ -528,10 +528,6 @@ func (c *cluster) waitVersion() {
 	}
 }
 
-func (c *cluster) name(i int) string {
-	return fmt.Sprint(i)
-}
-
 // isMembersEqual checks whether two members equal except ID field.
 // The given wmembs should always set ID field to empty string.
 func isMembersEqual(membs []client.Member, wmembs []client.Member) bool {

tests/integration/v2store/store_v2v3_test.go

@@ -97,7 +97,6 @@ func testSetKV(t testing.TB, endpoints []string) {
 	testCases := []struct {
 		key            string
 		value          string
-		dir            bool
 		wantIndexMatch bool
 	}{
 		{key: "/sdir/set", value: "1", wantIndexMatch: true},
@@ -147,7 +146,7 @@ func testCreateSetDir(t testing.TB, endpoints []string) {
 	v2 := v2v3.NewStore(cli, "")
 
 	for ti, tc := range testCases {
-		ev, err := v2.Create(tc.dir, true, "", false, v2store.TTLOptionSet{})
+		_, err := v2.Create(tc.dir, true, "", false, v2store.TTLOptionSet{})
 		if err != nil {
 			t.Skipf("%d: got err %v", ti, err)
 		}
@@ -156,7 +155,7 @@ func testCreateSetDir(t testing.TB, endpoints []string) {
 			t.Skipf("%d: expected err got nil", ti)
 		}
 
-		ev, err = v2.Delete("ddir", true, true)
+		ev, err := v2.Delete("ddir", true, true)
 		if err != nil {
 			t.Skipf("%d: got err %v", ti, err)
 		}

tests/integration/v3_grpc_inflight_test.go

@@ -79,7 +79,7 @@ func TestV3KVInflightRangeRequests(t *testing.T) {
 	for i := 0; i < reqN; i++ {
 		go func() {
 			defer wg.Done()
-			_, err := kvc.Range(ctx, &pb.RangeRequest{Key: []byte("foo"), Serializable: true}, grpc.FailFast(false))
+			_, err := kvc.Range(ctx, &pb.RangeRequest{Key: []byte("foo"), Serializable: true}, grpc.WaitForReady(true))
 			if err != nil {
 				errCode := status.Convert(err).Code()
 				errDesc := rpctypes.ErrorDesc(err)

tests/integration/v3_grpc_test.go

@@ -1943,7 +1943,7 @@ func waitForRestart(t *testing.T, kvc pb.KVClient) {
 	// TODO: Remove retry loop once the new grpc load balancer provides retry.
 	var err error
 	for i := 0; i < 10; i++ {
-		if _, err = kvc.Range(context.TODO(), req, grpc.FailFast(false)); err != nil {
+		if _, err = kvc.Range(context.TODO(), req, grpc.WaitForReady(true)); err != nil {
 			if status, ok := status.FromError(err); ok && status.Code() == codes.Unavailable {
 				time.Sleep(time.Millisecond * 250)
 			} else {

tests/integration/v3_kv_test.go

@@ -50,13 +50,13 @@ func TestKVWithEmptyValue(t *testing.T) {
 	}
 
 	//Remove all keys without WithFromKey/WithPrefix func
-	respDel, err := client.Delete(context.Background(), "")
+	_, err = client.Delete(context.Background(), "")
 	if err == nil {
 		// fatal error duo to without WithFromKey/WithPrefix func called.
 		t.Fatal(err)
 	}
 
-	respDel, err = client.Delete(context.Background(), "", clientv3.WithFromKey())
+	respDel, err := client.Delete(context.Background(), "", clientv3.WithFromKey())
 	if err != nil {
 		// fatal error duo to with WithFromKey/WithPrefix func called.
 		t.Fatal(err)