Cleanup

cluster.go

@@ -1012,7 +1012,7 @@ func (c *ClusterClient) reaper(idleCheckFrequency time.Duration) {
 		for _, node := range nodes {
 			_, err := node.Client.connPool.(*pool.ConnPool).ReapStaleConns()
 			if err != nil {
-				internal.Logf("ReapStaleConns failed: %s", err)
+				internal.Logger.Printf("ReapStaleConns failed: %s", err)
 			}
 		}
 	}
@@ -1524,7 +1524,7 @@ func (c *ClusterClient) cmdInfo(name string) *CommandInfo {
 
 	info := cmdsInfo[name]
 	if info == nil {
-		internal.Logf("info for cmd=%s not found", name)
+		internal.Logger.Printf("info for cmd=%s not found", name)
 	}
 	return info
 }

commands.go

@@ -14,7 +14,7 @@ func usePrecise(dur time.Duration) bool {
 
 func formatMs(dur time.Duration) int64 {
 	if dur > 0 && dur < time.Millisecond {
-		internal.Logf(
+		internal.Logger.Printf(
 			"specified duration is %s, but minimal supported value is %s",
 			dur, time.Millisecond,
 		)
@@ -24,7 +24,7 @@ func formatMs(dur time.Duration) int64 {
 
 func formatSec(dur time.Duration) int64 {
 	if dur > 0 && dur < time.Second {
-		internal.Logf(
+		internal.Logger.Printf(
 			"specified duration is %s, but minimal supported value is %s",
 			dur, time.Second,
 		)

internal/log.go

@@ -1,15 +1,8 @@
 package internal
 
 import (
-	"fmt"
 	"log"
+	"os"
 )
 
-var Logger *log.Logger
+var Logger = log.New(os.Stderr, "redis: ", log.LstdFlags|log.Lshortfile)
-
-func Logf(s string, args ...interface{}) {
-	if Logger == nil {
-		return
-	}
-	Logger.Output(2, fmt.Sprintf(s, args...))
-}

internal/pool/pool.go

@@ -139,10 +139,11 @@ func (p *ConnPool) _NewConn(ctx context.Context, pooled bool) (*Conn, error) {
 	p.connsMu.Lock()
 	p.conns = append(p.conns, cn)
 	if pooled {
-		if p.poolSize < p.opt.PoolSize {
+		// If pool is full remove the cn on next Put.
-			p.poolSize++
+		if p.poolSize >= p.opt.PoolSize {
-		} else {
 			cn.pooled = false
+		} else {
+			p.poolSize++
 		}
 	}
 	p.connsMu.Unlock()
@@ -315,18 +316,23 @@ func (p *ConnPool) Put(cn *Conn) {
 }
 
 func (p *ConnPool) Remove(cn *Conn) {
-	p.removeConn(cn)
+	p.removeConnWithLock(cn)
 	p.freeTurn()
 	_ = p.closeConn(cn)
 }
 
 func (p *ConnPool) CloseConn(cn *Conn) error {
-	p.removeConn(cn)
+	p.removeConnWithLock(cn)
 	return p.closeConn(cn)
 }
 
-func (p *ConnPool) removeConn(cn *Conn) {
+func (p *ConnPool) removeConnWithLock(cn *Conn) {
 	p.connsMu.Lock()
+	p.removeConn(cn)
+	p.connsMu.Unlock()
+}
+
+func (p *ConnPool) removeConn(cn *Conn) {
 	for i, c := range p.conns {
 		if c == cn {
 			p.conns = append(p.conns[:i], p.conns[i+1:]...)
@@ -334,10 +340,9 @@ func (p *ConnPool) removeConn(cn *Conn) {
 				p.poolSize--
 				p.checkMinIdleConns()
 			}
-			break
+			return
 		}
 	}
-	p.connsMu.Unlock()
 }
 
 func (p *ConnPool) closeConn(cn *Conn) error {
@@ -415,20 +420,21 @@ func (p *ConnPool) Close() error {
 	return firstErr
 }
 
-func (p *ConnPool) reapStaleConn() *Conn {
+func (p *ConnPool) reaper(frequency time.Duration) {
-	if len(p.idleConns) == 0 {
+	ticker := time.NewTicker(frequency)
-		return nil
+	defer ticker.Stop()
+
+	for range ticker.C {
+		if p.closed() {
+			break
+		}
+		n, err := p.ReapStaleConns()
+		if err != nil {
+			internal.Logger.Printf("ReapStaleConns failed: %s", err)
+			continue
+		}
+		atomic.AddUint32(&p.stats.StaleConns, uint32(n))
 	}
-
-	cn := p.idleConns[0]
-	if !p.isStaleConn(cn) {
-		return nil
-	}
-
-	p.idleConns = append(p.idleConns[:0], p.idleConns[1:]...)
-	p.idleConnsLen--
-
-	return cn
 }
 
 func (p *ConnPool) ReapStaleConns() (int, error) {
@@ -439,11 +445,6 @@ func (p *ConnPool) ReapStaleConns() (int, error) {
 		p.connsMu.Lock()
 		cn := p.reapStaleConn()
 		p.connsMu.Unlock()
-
-		if cn != nil {
-			p.removeConn(cn)
-		}
-
 		p.freeTurn()
 
 		if cn != nil {
@@ -456,21 +457,21 @@ func (p *ConnPool) ReapStaleConns() (int, error) {
 	return n, nil
 }
 
-func (p *ConnPool) reaper(frequency time.Duration) {
+func (p *ConnPool) reapStaleConn() *Conn {
-	ticker := time.NewTicker(frequency)
+	if len(p.idleConns) == 0 {
-	defer ticker.Stop()
+		return nil
-
-	for range ticker.C {
-		if p.closed() {
-			break
-		}
-		n, err := p.ReapStaleConns()
-		if err != nil {
-			internal.Logf("ReapStaleConns failed: %s", err)
-			continue
-		}
-		atomic.AddUint32(&p.stats.StaleConns, uint32(n))
 	}
+
+	cn := p.idleConns[0]
+	if !p.isStaleConn(cn) {
+		return nil
+	}
+
+	p.idleConns = append(p.idleConns[:0], p.idleConns[1:]...)
+	p.idleConnsLen--
+	p.removeConn(cn)
+
+	return cn
 }
 
 func (p *ConnPool) isStaleConn(cn *Conn) bool {

pubsub.go

@@ -52,14 +52,14 @@ func (c *PubSub) init() {
 	c.exit = make(chan struct{})
 }
 
-func (c *PubSub) conn() (*pool.Conn, error) {
+func (c *PubSub) connWithLock() (*pool.Conn, error) {
 	c.mu.Lock()
-	cn, err := c._conn(nil)
+	cn, err := c.conn(nil)
 	c.mu.Unlock()
 	return cn, err
 }
 
-func (c *PubSub) _conn(newChannels []string) (*pool.Conn, error) {
+func (c *PubSub) conn(newChannels []string) (*pool.Conn, error) {
 	if c.closed {
 		return nil, pool.ErrClosed
 	}
@@ -132,32 +132,32 @@ func (c *PubSub) _subscribe(
 	return c.writeCmd(context.TODO(), cn, cmd)
 }
 
-func (c *PubSub) releaseConn(cn *pool.Conn, err error, allowTimeout bool) {
+func (c *PubSub) releaseConnWithLock(cn *pool.Conn, err error, allowTimeout bool) {
 	c.mu.Lock()
-	c._releaseConn(cn, err, allowTimeout)
+	c.releaseConn(cn, err, allowTimeout)
 	c.mu.Unlock()
 }
 
-func (c *PubSub) _releaseConn(cn *pool.Conn, err error, allowTimeout bool) {
+func (c *PubSub) releaseConn(cn *pool.Conn, err error, allowTimeout bool) {
 	if c.cn != cn {
 		return
 	}
 	if internal.IsBadConn(err, allowTimeout) {
-		c._reconnect(err)
+		c.reconnect(err)
 	}
 }
 
-func (c *PubSub) _reconnect(reason error) {
+func (c *PubSub) reconnect(reason error) {
-	_ = c._closeTheCn(reason)
+	_ = c.closeTheCn(reason)
-	_, _ = c._conn(nil)
+	_, _ = c.conn(nil)
 }
 
-func (c *PubSub) _closeTheCn(reason error) error {
+func (c *PubSub) closeTheCn(reason error) error {
 	if c.cn == nil {
 		return nil
 	}
 	if !c.closed {
-		internal.Logf("redis: discarding bad PubSub connection: %s", reason)
+		internal.Logger.Printf("redis: discarding bad PubSub connection: %s", reason)
 	}
 	err := c.closeConn(c.cn)
 	c.cn = nil
@@ -174,8 +174,7 @@ func (c *PubSub) Close() error {
 	c.closed = true
 	close(c.exit)
 
-	err := c._closeTheCn(pool.ErrClosed)
+	return c.closeTheCn(pool.ErrClosed)
-	return err
 }
 
 // Subscribe the client to the specified channels. It returns
@@ -237,13 +236,13 @@ func (c *PubSub) PUnsubscribe(patterns ...string) error {
 }
 
 func (c *PubSub) subscribe(redisCmd string, channels ...string) error {
-	cn, err := c._conn(channels)
+	cn, err := c.conn(channels)
 	if err != nil {
 		return err
 	}
 
 	err = c._subscribe(cn, redisCmd, channels)
-	c._releaseConn(cn, err, false)
+	c.releaseConn(cn, err, false)
 	return err
 }
 
@@ -254,13 +253,13 @@ func (c *PubSub) Ping(payload ...string) error {
 	}
 	cmd := NewCmd(args...)
 
-	cn, err := c.conn()
+	cn, err := c.connWithLock()
 	if err != nil {
 		return err
 	}
 
 	err = c.writeCmd(context.TODO(), cn, cmd)
-	c.releaseConn(cn, err, false)
+	c.releaseConnWithLock(cn, err, false)
 	return err
 }
 
@@ -346,7 +345,7 @@ func (c *PubSub) ReceiveTimeout(timeout time.Duration) (interface{}, error) {
 		c.cmd = NewCmd()
 	}
 
-	cn, err := c.conn()
+	cn, err := c.connWithLock()
 	if err != nil {
 		return nil, err
 	}
@@ -355,7 +354,7 @@ func (c *PubSub) ReceiveTimeout(timeout time.Duration) (interface{}, error) {
 		return c.cmd.readReply(rd)
 	})
 
-	c.releaseConn(cn, err, timeout > 0)
+	c.releaseConnWithLock(cn, err, timeout > 0)
 	if err != nil {
 		return nil, err
 	}
@@ -467,12 +466,12 @@ func (c *PubSub) initChannel(size int) {
 						<-timer.C
 					}
 				case <-timer.C:
-					internal.Logf(
+					internal.Logger.Printf(
 						"redis: %s channel is full for %s (message is dropped)",
 						c, timeout)
 				}
 			default:
-				internal.Logf("redis: unknown message type: %T", msg)
+				internal.Logger.Printf("redis: unknown message type: %T", msg)
 			}
 		}
 	}()
@@ -499,7 +498,7 @@ func (c *PubSub) initChannel(size int) {
 						pingErr = errPingTimeout
 					}
 					c.mu.Lock()
-					c._reconnect(pingErr)
+					c.reconnect(pingErr)
 					c.mu.Unlock()
 				}
 			case <-c.exit:

redis.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"fmt"
 	"log"
-	"os"
 	"time"
 
 	"github.com/go-redis/redis/internal"
@@ -15,10 +14,6 @@ import (
 // Nil reply Redis returns when key does not exist.
 const Nil = proto.Nil
 
-func init() {
-	SetLogger(log.New(os.Stderr, "redis: ", log.LstdFlags|log.Lshortfile))
-}
-
 func SetLogger(logger *log.Logger) {
 	internal.Logger = logger
 }

ring.go

@@ -260,7 +260,7 @@ func (c *ringShards) Heartbeat(frequency time.Duration) {
 		for _, shard := range shards {
 			err := shard.Client.Ping().Err()
 			if shard.Vote(err == nil || err == pool.ErrPoolTimeout) {
-				internal.Logf("ring shard state changed: %s", shard)
+				internal.Logger.Printf("ring shard state changed: %s", shard)
 				rebalance = true
 			}
 		}
@@ -525,7 +525,7 @@ func (c *Ring) cmdInfo(name string) *CommandInfo {
 	}
 	info := cmdsInfo[name]
 	if info == nil {
-		internal.Logf("info for cmd=%s not found", name)
+		internal.Logger.Printf("info for cmd=%s not found", name)
 	}
 	return info
 }

sentinel.go

@@ -360,7 +360,7 @@ func (c *sentinelFailover) masterAddr() (string, error) {
 
 		masterAddr, err := sentinel.GetMasterAddrByName(c.masterName).Result()
 		if err != nil {
-			internal.Logf("sentinel: GetMasterAddrByName master=%q failed: %s",
+			internal.Logger.Printf("sentinel: GetMasterAddrByName master=%q failed: %s",
 				c.masterName, err)
 			_ = sentinel.Close()
 			continue
@@ -388,7 +388,7 @@ func (c *sentinelFailover) getMasterAddr() string {
 
 	addr, err := sentinel.GetMasterAddrByName(c.masterName).Result()
 	if err != nil {
-		internal.Logf("sentinel: GetMasterAddrByName name=%q failed: %s",
+		internal.Logger.Printf("sentinel: GetMasterAddrByName name=%q failed: %s",
 			c.masterName, err)
 		c.mu.Lock()
 		if c.sentinel == sentinel {
@@ -412,7 +412,7 @@ func (c *sentinelFailover) switchMaster(addr string) {
 	c.mu.Lock()
 	defer c.mu.Unlock()
 
-	internal.Logf("sentinel: new master=%q addr=%q",
+	internal.Logger.Printf("sentinel: new master=%q addr=%q",
 		c.masterName, addr)
 	_ = c.Pool().Filter(func(cn *pool.Conn) bool {
 		return cn.RemoteAddr().String() != addr
@@ -449,7 +449,7 @@ func (c *sentinelFailover) closeSentinel() error {
 func (c *sentinelFailover) discoverSentinels(sentinel *SentinelClient) {
 	sentinels, err := sentinel.Sentinels(c.masterName).Result()
 	if err != nil {
-		internal.Logf("sentinel: Sentinels master=%q failed: %s", c.masterName, err)
+		internal.Logger.Printf("sentinel: Sentinels master=%q failed: %s", c.masterName, err)
 		return
 	}
 	for _, sentinel := range sentinels {
@@ -459,7 +459,7 @@ func (c *sentinelFailover) discoverSentinels(sentinel *SentinelClient) {
 			if key == "name" {
 				sentinelAddr := vals[i+1].(string)
 				if !contains(c.sentinelAddrs, sentinelAddr) {
-					internal.Logf("sentinel: discovered new sentinel=%q for master=%q",
+					internal.Logger.Printf("sentinel: discovered new sentinel=%q for master=%q",
 						sentinelAddr, c.masterName)
 					c.sentinelAddrs = append(c.sentinelAddrs, sentinelAddr)
 				}
@@ -479,7 +479,7 @@ func (c *sentinelFailover) listen(pubsub *PubSub) {
 		if msg.Channel == "+switch-master" {
 			parts := strings.Split(msg.Payload, " ")
 			if parts[0] != c.masterName {
-				internal.Logf("sentinel: ignore addr for master=%q", parts[0])
+				internal.Logger.Printf("sentinel: ignore addr for master=%q", parts[0])
 				continue
 			}
 			addr := net.JoinHostPort(parts[3], parts[4])