Cleanup.

multi.go

@@ -17,7 +17,7 @@ func (c *Client) Multi() *Multi {
 		Client: &Client{
 			baseClient: &baseClient{
 				opt:      c.opt,
-				connPool: newSingleConnPool(c.connPool, nil, true),
+				connPool: newSingleConnPool(c.connPool, true),
 			},
 		},
 	}

parser.go

@@ -17,7 +17,7 @@ var (
 
 //------------------------------------------------------------------------------
 
-func appendCmd(buf []byte, args []string) []byte {
+func appendArgs(buf []byte, args []string) []byte {
 	buf = append(buf, '*')
 	buf = strconv.AppendUint(buf, uint64(len(args)), 10)
 	buf = append(buf, '\r', '\n')

pool.go

@@ -162,7 +162,7 @@ func (p *connPool) Get() (*conn, bool, error) {
 	}
 
 	if p.conns.Len() < p.opt.PoolSize {
-		cn, err := p.dial()
+		cn, err := p.new()
 		if err != nil {
 			p.cond.L.Unlock()
 			return nil, false, err
@@ -277,60 +277,68 @@ func (p *connPool) Close() error {
 type singleConnPool struct {
 	pool pool
 
-	l        sync.RWMutex
-	cn       *conn
+	cnMtx sync.Mutex
+	cn    *conn
+
 	reusable bool
 
 	closed bool
 }
 
-func newSingleConnPool(pool pool, cn *conn, reusable bool) *singleConnPool {
+func newSingleConnPool(pool pool, reusable bool) *singleConnPool {
 	return &singleConnPool{
 		pool:     pool,
-		cn:       cn,
 		reusable: reusable,
 	}
 }
 
+func (p *singleConnPool) SetConn(cn *conn) {
+	p.cnMtx.Lock()
+	p.cn = cn
+	p.cnMtx.Unlock()
+}
+
 func (p *singleConnPool) Get() (*conn, bool, error) {
-	p.l.RLock()
+	defer p.cnMtx.Unlock()
+	p.cnMtx.Lock()
+
 	if p.closed {
-		p.l.RUnlock()
 		return nil, false, errClosed
 	}
 	if p.cn != nil {
-		p.l.RUnlock()
 		return p.cn, false, nil
 	}
-	p.l.RUnlock()
 
-	p.l.Lock()
 	cn, isNew, err := p.pool.Get()
 	if err != nil {
-		p.l.Unlock()
 		return nil, false, err
 	}
 	p.cn = cn
-	p.l.Unlock()
-	return cn, isNew, nil
+
+	return p.cn, isNew, nil
 }
 
 func (p *singleConnPool) Put(cn *conn) error {
-	p.l.Lock()
+	defer p.cnMtx.Unlock()
+	p.cnMtx.Lock()
 	if p.cn != cn {
 		panic("p.cn != cn")
 	}
 	if p.closed {
-		p.l.Unlock()
 		return errClosed
 	}
-	p.l.Unlock()
 	return nil
 }
 
+func (p *singleConnPool) put() error {
+	err := p.pool.Put(p.cn)
+	p.cn = nil
+	return err
+}
+
 func (p *singleConnPool) Remove(cn *conn) error {
-	defer p.l.Unlock()
-	p.l.Lock()
+	defer p.cnMtx.Unlock()
+	p.cnMtx.Lock()
 	if p.cn == nil {
 		panic("p.cn == nil")
 	}
@@ -350,48 +358,47 @@ func (p *singleConnPool) remove() error {
 }
 
 func (p *singleConnPool) Len() int {
-	defer p.l.Unlock()
-	p.l.Lock()
+	defer p.cnMtx.Unlock()
+	p.cnMtx.Lock()
 	if p.cn == nil {
 		return 0
 	}
 	return 1
 }
 
 func (p *singleConnPool) Size() int {
-	defer p.l.Unlock()
-	p.l.Lock()
+	defer p.cnMtx.Unlock()
+	p.cnMtx.Lock()
 	if p.cn == nil {
 		return 0
 	}
 	return 1
 }
 
 func (p *singleConnPool) Filter(f func(*conn) bool) {
-	p.l.Lock()
+	p.cnMtx.Lock()
 	if p.cn != nil {
 		if !f(p.cn) {
 			p.remove()
 		}
 	}
-	p.l.Unlock()
+	p.cnMtx.Unlock()
 }
 
 func (p *singleConnPool) Close() error {
-	defer p.l.Unlock()
-	p.l.Lock()
+	defer p.cnMtx.Unlock()
+	p.cnMtx.Lock()
 	if p.closed {
 		return nil
 	}
 	p.closed = true
 	var err error
 	if p.cn != nil {
 		if p.reusable {
-			err = p.pool.Put(p.cn)
+			err = p.put()
 		} else {
-			err = p.pool.Remove(p.cn)
+			err = p.remove()
 		}
 	}
-	p.cn = nil
 	return err
 }

pubsub.go

@@ -14,7 +14,7 @@ func (c *Client) PubSub() *PubSub {
 	return &PubSub{
 		baseClient: &baseClient{
 			opt:      c.opt,
-			connPool: newSingleConnPool(c.connPool, nil, false),
+			connPool: newSingleConnPool(c.connPool, false),
 		},
 	}
 }

redis.go

@@ -14,9 +14,9 @@ type baseClient struct {
 }
 
 func (c *baseClient) writeCmd(cn *conn, cmds ...Cmder) error {
-	buf := make([]byte, 0, 1000)
+	buf := make([]byte, 0, 64)
 	for _, cmd := range cmds {
-		buf = appendCmd(buf, cmd.args())
+		buf = appendArgs(buf, cmd.args())
 	}
 
 	_, err := cn.Write(buf)
@@ -29,8 +29,8 @@ func (c *baseClient) conn() (*conn, error) {
 		return nil, err
 	}
 
-	if isNew && (c.opt.Password != "" || c.opt.DB > 0) {
-		if err = c.init(cn, c.opt.Password, c.opt.DB); err != nil {
+	if isNew {
+		if err := c.initConn(cn); err != nil {
 			c.removeConn(cn)
 			return nil, err
 		}
@@ -39,26 +39,31 @@ func (c *baseClient) conn() (*conn, error) {
 	return cn, nil
 }
 
-func (c *baseClient) init(cn *conn, password string, db int64) error {
-	// Client is not closed on purpose.
+func (c *baseClient) initConn(cn *conn) error {
+	if c.opt.Password == "" || c.opt.DB == 0 {
+		return nil
+	}
+
+	pool := newSingleConnPool(c.connPool, false)
+	pool.SetConn(cn)
+
+	// Client is not closed because we want to reuse underlying connection.
 	client := &Client{
 		baseClient: &baseClient{
 			opt:      c.opt,
-			connPool: newSingleConnPool(c.connPool, cn, false),
+			connPool: pool,
 		},
 	}
 
-	if password != "" {
-		auth := client.Auth(password)
-		if auth.Err() != nil {
-			return auth.Err()
+	if c.opt.Password != "" {
+		if err := client.Auth(c.opt.Password).Err(); err != nil {
+			return err
 		}
 	}
 
-	if db > 0 {
-		sel := client.Select(db)
-		if sel.Err() != nil {
-			return sel.Err()
+	if c.opt.DB > 0 {
+		if err := client.Select(c.opt.DB).Err(); err != nil {
+			return err
 		}
 	}
 
@@ -102,14 +107,16 @@ func (c *baseClient) run(cmd Cmder) {
 		return
 	}
 
-	cn.writeTimeout = c.opt.WriteTimeout
 	if timeout := cmd.writeTimeout(); timeout != nil {
 		cn.writeTimeout = *timeout
+	} else {
+		cn.writeTimeout = c.opt.WriteTimeout
 	}
 
-	cn.readTimeout = c.opt.ReadTimeout
 	if timeout := cmd.readTimeout(); timeout != nil {
 		cn.readTimeout = *timeout
+	} else {
+		cn.readTimeout = c.opt.ReadTimeout
 	}
 
 	if err := c.writeCmd(cn, cmd); err != nil {

sentinel.go

@@ -94,7 +94,7 @@ func (c *sentinelClient) PubSub() *PubSub {
 	return &PubSub{
 		baseClient: &baseClient{
 			opt:      c.opt,
-			connPool: newSingleConnPool(c.connPool, nil, false),
+			connPool: newSingleConnPool(c.connPool, false),
 		},
 	}
 }