Add golangci-lint

.golangci.yml

@@ -0,0 +1,11 @@
+run:
+  concurrency: 8
+  deadline: 5m
+  tests: false
+linters:
+  enable-all: true
+  disable:
+    - gochecknoglobals
+    - goconst
+    - gosec
+    - maligned

.travis.yml

@@ -18,3 +18,6 @@ env:
   - GO111MODULE=on
 
 go_import_path: github.com/go-redis/redis
+
+before_install:
+  - curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b $(go env GOPATH)/bin v1.17.1

Makefile

@@ -6,6 +6,7 @@ all: testdeps
 	go vet
 	go get github.com/gordonklaus/ineffassign
 	ineffassign .
+	golangci-lint run
 
 testdeps: testdata/redis/src/redis-server
 

bench_test.go

@@ -237,7 +237,7 @@ func BenchmarkRingWithContext(b *testing.B) {
 func newClusterScenario() *clusterScenario {
 	return &clusterScenario{
 		ports:     []string{"8220", "8221", "8222", "8223", "8224", "8225"},
-		nodeIds:   make([]string, 6),
+		nodeIDs:   make([]string, 6),
 		processes: make(map[string]*redisProcess, 6),
 		clients:   make(map[string]*redis.Client, 6),
 	}

cluster.go

@@ -307,6 +307,7 @@ func (c *clusterNodes) NextGeneration() uint32 {
 
 // GC removes unused nodes.
 func (c *clusterNodes) GC(generation uint32) {
+	//nolint:prealloc
 	var collected []*clusterNode
 	c.mu.Lock()
 	for addr, node := range c.allNodes {
@@ -651,8 +652,8 @@ type clusterClient struct {
 
 	opt           *ClusterOptions
 	nodes         *clusterNodes
-	state         *clusterStateHolder
+	state         *clusterStateHolder //nolint:structcheck
-	cmdsInfoCache *cmdsInfoCache
+	cmdsInfoCache *cmdsInfoCache      //nolint:structcheck
 }
 
 // ClusterClient is a Redis Cluster client representing a pool of zero

cluster_test.go

@@ -18,7 +18,7 @@ import (
 
 type clusterScenario struct {
 	ports     []string
-	nodeIds   []string
+	nodeIDs   []string
 	processes map[string]*redisProcess
 	clients   map[string]*redis.Client
 }
@@ -98,7 +98,7 @@ func startCluster(scenario *clusterScenario) error {
 
 		scenario.processes[port] = process
 		scenario.clients[port] = client
-		scenario.nodeIds[pos] = info[:40]
+		scenario.nodeIDs[pos] = info[:40]
 	}
 
 	// Meet cluster nodes.
@@ -120,12 +120,12 @@ func startCluster(scenario *clusterScenario) error {
 
 	// Bootstrap slaves.
 	for idx, slave := range scenario.slaves() {
-		masterId := scenario.nodeIds[idx]
+		masterID := scenario.nodeIDs[idx]
 
 		// Wait until master is available
 		err := eventually(func() error {
 			s := slave.ClusterNodes().Val()
-			wanted := masterId
+			wanted := masterID
 			if !strings.Contains(s, wanted) {
 				return fmt.Errorf("%q does not contain %q", s, wanted)
 			}
@@ -135,7 +135,7 @@ func startCluster(scenario *clusterScenario) error {
 			return err
 		}
 
-		err = slave.ClusterReplicate(masterId).Err()
+		err = slave.ClusterReplicate(masterID).Err()
 		if err != nil {
 			return err
 		}
@@ -146,30 +146,30 @@ func startCluster(scenario *clusterScenario) error {
 		Start: 0,
 		End:   4999,
 		Nodes: []redis.ClusterNode{{
-			Id:   "",
+			ID:   "",
 			Addr: "127.0.0.1:8220",
 		}, {
-			Id:   "",
+			ID:   "",
 			Addr: "127.0.0.1:8223",
 		}},
 	}, {
 		Start: 5000,
 		End:   9999,
 		Nodes: []redis.ClusterNode{{
-			Id:   "",
+			ID:   "",
 			Addr: "127.0.0.1:8221",
 		}, {
-			Id:   "",
+			ID:   "",
 			Addr: "127.0.0.1:8224",
 		}},
 	}, {
 		Start: 10000,
 		End:   16383,
 		Nodes: []redis.ClusterNode{{
-			Id:   "",
+			ID:   "",
 			Addr: "127.0.0.1:8222",
 		}, {
-			Id:   "",
+			ID:   "",
 			Addr: "127.0.0.1:8225",
 		}},
 	}}
@@ -592,30 +592,30 @@ var _ = Describe("ClusterClient", func() {
 				Start: 0,
 				End:   4999,
 				Nodes: []redis.ClusterNode{{
-					Id:   "",
+					ID:   "",
 					Addr: "127.0.0.1:8220",
 				}, {
-					Id:   "",
+					ID:   "",
 					Addr: "127.0.0.1:8223",
 				}},
 			}, {
 				Start: 5000,
 				End:   9999,
 				Nodes: []redis.ClusterNode{{
-					Id:   "",
+					ID:   "",
 					Addr: "127.0.0.1:8221",
 				}, {
-					Id:   "",
+					ID:   "",
 					Addr: "127.0.0.1:8224",
 				}},
 			}, {
 				Start: 10000,
 				End:   16383,
 				Nodes: []redis.ClusterNode{{
-					Id:   "",
+					ID:   "",
 					Addr: "127.0.0.1:8222",
 				}, {
-					Id:   "",
+					ID:   "",
 					Addr: "127.0.0.1:8225",
 				}},
 			}}
@@ -647,7 +647,7 @@ var _ = Describe("ClusterClient", func() {
 		})
 
 		It("should CLUSTER COUNT-FAILURE-REPORTS", func() {
-			n, err := client.ClusterCountFailureReports(cluster.nodeIds[0]).Result()
+			n, err := client.ClusterCountFailureReports(cluster.nodeIDs[0]).Result()
 			Expect(err).NotTo(HaveOccurred())
 			Expect(n).To(Equal(int64(0)))
 		})
@@ -665,7 +665,7 @@ var _ = Describe("ClusterClient", func() {
 		})
 
 		It("should CLUSTER SLAVES", func() {
-			nodesList, err := client.ClusterSlaves(cluster.nodeIds[0]).Result()
+			nodesList, err := client.ClusterSlaves(cluster.nodeIDs[0]).Result()
 			Expect(err).NotTo(HaveOccurred())
 			Expect(nodesList).Should(ContainElement(ContainSubstring("slave")))
 			Expect(nodesList).Should(HaveLen(1))

command.go

@@ -52,7 +52,7 @@ func writeCmd(wr *proto.Writer, cmds ...Cmder) error {
 }
 
 func cmdString(cmd Cmder, val interface{}) string {
-	var ss []string
+	ss := make([]string, 0, len(cmd.Args()))
 	for _, arg := range cmd.Args() {
 		ss = append(ss, fmt.Sprint(arg))
 	}
@@ -996,6 +996,7 @@ func (cmd *XMessageSliceCmd) readReply(rd *proto.Reader) error {
 func xMessageSliceParser(rd *proto.Reader, n int64) (interface{}, error) {
 	msgs := make([]XMessage, n)
 	for i := 0; i < len(msgs); i++ {
+		i := i
 		_, err := rd.ReadArrayReply(func(rd *proto.Reader, n int64) (interface{}, error) {
 			id, err := rd.ReadString()
 			if err != nil {
@@ -1076,6 +1077,7 @@ func (cmd *XStreamSliceCmd) readReply(rd *proto.Reader) error {
 	_, cmd.err = rd.ReadArrayReply(func(rd *proto.Reader, n int64) (interface{}, error) {
 		cmd.val = make([]XStream, n)
 		for i := 0; i < len(cmd.val); i++ {
+			i := i
 			_, err := rd.ReadArrayReply(func(rd *proto.Reader, n int64) (interface{}, error) {
 				if n != 2 {
 					return nil, fmt.Errorf("got %d, wanted 2", n)
@@ -1441,7 +1443,7 @@ func (cmd *ScanCmd) Iterator() *ScanIterator {
 //------------------------------------------------------------------------------
 
 type ClusterNode struct {
-	Id   string
+	ID   string
 	Addr string
 }
 
@@ -1528,7 +1530,7 @@ func (cmd *ClusterSlotsCmd) readReply(rd *proto.Reader) error {
 					if err != nil {
 						return nil, err
 					}
-					nodes[j].Id = id
+					nodes[j].ID = id
 				}
 			}
 
@@ -1737,6 +1739,7 @@ func (cmd *GeoPosCmd) readReply(rd *proto.Reader) error {
 	_, cmd.err = rd.ReadArrayReply(func(rd *proto.Reader, n int64) (interface{}, error) {
 		cmd.val = make([]*GeoPos, n)
 		for i := 0; i < len(cmd.val); i++ {
+			i := i
 			_, err := rd.ReadReply(func(rd *proto.Reader, n int64) (interface{}, error) {
 				longitude, err := rd.ReadFloatReply()
 				if err != nil {

internal/error.go

@@ -64,11 +64,12 @@ func IsMovedError(err error) (moved bool, ask bool, addr string) {
 	}
 
 	s := err.Error()
-	if strings.HasPrefix(s, "MOVED ") {
+	switch {
+	case strings.HasPrefix(s, "MOVED "):
 		moved = true
-	} else if strings.HasPrefix(s, "ASK ") {
+	case strings.HasPrefix(s, "ASK "):
 		ask = true
-	} else {
+	default:
 		return
 	}
 

internal/pool/pool.go

@@ -447,7 +447,7 @@ func (p *ConnPool) ReapStaleConns() (int, error) {
 		p.freeTurn()
 
 		if cn != nil {
-			p.closeConn(cn)
+			_ = p.closeConn(cn)
 			n++
 		} else {
 			break

internal/proto/writer.go

@@ -90,9 +90,8 @@ func (w *Writer) writeArg(v interface{}) error {
 	case bool:
 		if v {
 			return w.int(1)
-		} else {
-			return w.int(0)
 		}
+		return w.int(0)
 	case time.Time:
 		return w.string(v.Format(time.RFC3339))
 	case encoding.BinaryMarshaler:

main_test.go

@@ -45,7 +45,7 @@ var (
 
 var cluster = &clusterScenario{
 	ports:     []string{"8220", "8221", "8222", "8223", "8224", "8225"},
-	nodeIds:   make([]string, 6),
+	nodeIDs:   make([]string, 6),
 	processes: make(map[string]*redisProcess, 6),
 	clients:   make(map[string]*redis.Client, 6),
 }

options.go

@@ -113,9 +113,8 @@ func (opt *Options) init() {
 			}
 			if opt.TLSConfig == nil {
 				return netDialer.Dial(network, addr)
-			} else {
-				return tls.DialWithDialer(netDialer, opt.Network, opt.Addr, opt.TLSConfig)
 			}
+			return tls.DialWithDialer(netDialer, opt.Network, opt.Addr, opt.TLSConfig)
 		}
 	}
 	if opt.PoolSize == 0 {

pipeline.go

@@ -71,7 +71,7 @@ func (c *Pipeline) Process(cmd Cmder) error {
 // Close closes the pipeline, releasing any open resources.
 func (c *Pipeline) Close() error {
 	c.mu.Lock()
-	c.discard()
+	_ = c.discard()
 	c.closed = true
 	c.mu.Unlock()
 	return nil

pubsub.go

@@ -97,10 +97,7 @@ func (c *PubSub) resubscribe(cn *pool.Conn) error {
 	var firstErr error
 
 	if len(c.channels) > 0 {
-		err := c._subscribe(cn, "subscribe", mapKeys(c.channels))
+		firstErr = c._subscribe(cn, "subscribe", mapKeys(c.channels))
-		if err != nil && firstErr == nil {
-			firstErr = err
-		}
 	}
 
 	if len(c.patterns) > 0 {

ring.go

@@ -339,7 +339,7 @@ type ring struct {
 	hooks
 	opt           *RingOptions
 	shards        *ringShards
-	cmdsInfoCache *cmdsInfoCache
+	cmdsInfoCache *cmdsInfoCache //nolint:structcheck
 }
 
 // Ring is a Redis client that uses consistent hashing to distribute

script.go

@@ -24,7 +24,7 @@ type Script struct {
 
 func NewScript(src string) *Script {
 	h := sha1.New()
-	io.WriteString(h, src)
+	_, _ = io.WriteString(h, src)
 	return &Script{
 		src:  src,
 		hash: hex.EncodeToString(h.Sum(nil)),

sentinel.go

@@ -432,15 +432,10 @@ func (c *sentinelFailover) setSentinel(sentinel *SentinelClient) {
 }
 
 func (c *sentinelFailover) closeSentinel() error {
-	var firstErr error
+	firstErr := c.pubsub.Close()
-
-	err := c.pubsub.Close()
-	if err != nil && firstErr == nil {
-		firstErr = err
-	}
 	c.pubsub = nil
 
-	err = c.sentinel.Close()
+	err := c.sentinel.Close()
 	if err != nil && firstErr == nil {
 		firstErr = err
 	}