Merge pull request redis#482 from go-redis/fix/defer-order

Fix defer order.

internal/pool/pool_sticky.go

@@ -11,7 +11,7 @@ type StickyConnPool struct {
 
 	cn     *Conn
 	closed bool
-	mx     sync.Mutex
+	mu     sync.Mutex
 }
 
 var _ Pooler = (*StickyConnPool)(nil)
@@ -24,15 +24,15 @@ func NewStickyConnPool(pool *ConnPool, reusable bool) *StickyConnPool {
 }
 
 func (p *StickyConnPool) First() *Conn {
-	p.mx.Lock()
+	p.mu.Lock()
 	cn := p.cn
-	p.mx.Unlock()
+	p.mu.Unlock()
 	return cn
 }
 
 func (p *StickyConnPool) Get() (*Conn, bool, error) {
-	defer p.mx.Unlock()
-	p.mx.Lock()
+	p.mu.Lock()
+	defer p.mu.Unlock()
 
 	if p.closed {
 		return nil, false, ErrClosed
@@ -56,8 +56,9 @@ func (p *StickyConnPool) putUpstream() (err error) {
 }
 
 func (p *StickyConnPool) Put(cn *Conn) error {
-	defer p.mx.Unlock()
-	p.mx.Lock()
+	p.mu.Lock()
+	defer p.mu.Unlock()
+
 	if p.closed {
 		return ErrClosed
 	}
@@ -74,8 +75,9 @@ func (p *StickyConnPool) removeUpstream(reason error) error {
 }
 
 func (p *StickyConnPool) Remove(cn *Conn, reason error) error {
-	defer p.mx.Unlock()
-	p.mx.Lock()
+	p.mu.Lock()
+	defer p.mu.Unlock()
+
 	if p.closed {
 		return nil
 	}
@@ -89,17 +91,19 @@ func (p *StickyConnPool) Remove(cn *Conn, reason error) error {
 }
 
 func (p *StickyConnPool) Len() int {
-	defer p.mx.Unlock()
-	p.mx.Lock()
+	p.mu.Lock()
+	defer p.mu.Unlock()
+
 	if p.cn == nil {
 		return 0
 	}
 	return 1
 }
 
 func (p *StickyConnPool) FreeLen() int {
-	defer p.mx.Unlock()
-	p.mx.Lock()
+	p.mu.Lock()
+	defer p.mu.Unlock()
+
 	if p.cn == nil {
 		return 1
 	}
@@ -111,8 +115,9 @@ func (p *StickyConnPool) Stats() *Stats {
 }
 
 func (p *StickyConnPool) Close() error {
-	defer p.mx.Unlock()
-	p.mx.Lock()
+	p.mu.Lock()
+	defer p.mu.Unlock()
+
 	if p.closed {
 		return ErrClosed
 	}
@@ -130,8 +135,8 @@ func (p *StickyConnPool) Close() error {
 }
 
 func (p *StickyConnPool) Closed() bool {
-	p.mx.Lock()
+	p.mu.Lock()
 	closed := p.closed
-	p.mx.Unlock()
+	p.mu.Unlock()
 	return closed
 }

pipeline.go

@@ -61,8 +61,8 @@ func (c *Pipeline) discard() error {
 // Exec always returns list of commands and error of the first failed
 // command if any.
 func (c *Pipeline) Exec() ([]Cmder, error) {
-	defer c.mu.Unlock()
 	c.mu.Lock()
+	defer c.mu.Unlock()
 
 	if c.closed {
 		return nil, pool.ErrClosed

ring.go

@@ -328,8 +328,8 @@ func (c *Ring) heartbeat() {
 // It is rare to Close a Ring, as the Ring is meant to be long-lived
 // and shared between many goroutines.
 func (c *Ring) Close() error {
-	defer c.mu.Unlock()
 	c.mu.Lock()
+	defer c.mu.Unlock()
 
 	if c.closed {
 		return nil

sentinel.go

@@ -162,8 +162,8 @@ func (d *sentinelFailover) Pool() *pool.ConnPool {
 }
 
 func (d *sentinelFailover) MasterAddr() (string, error) {
-	defer d.mu.Unlock()
 	d.mu.Lock()
+	defer d.mu.Unlock()
 
 	// Try last working sentinel.
 	if d.sentinel != nil {