code review 7933043: crypto/tls: use method values

src/pkg/crypto/tls/common.go

Index: src/pkg/crypto/tls/common.go 
=================================================================== 
--- a/src/pkg/crypto/tls/common.go 
+++ b/src/pkg/crypto/tls/common.go 
@@ -204,7 +204,24 @@ 
	// connections using that key are compromised. 
	SessionTicketKey [32]byte 
 
-	serverInitOnce sync.Once 
+	serverInitOnce sync.Once // guards calling (*Config).serverInit 
+} 
+ 
+func (c *Config) serverInit() { 
+	if c.SessionTicketsDisabled { 
+	return 
+	} 
+ 
+	// If the key has already been set then we have nothing to do. 
+	for _, b := range c.SessionTicketKey { 
+	if b != 0 { 
+	return 
+	} 
+	} 
+ 
+	if _, err := io.ReadFull(c.rand(), c.SessionTicketKey[:]); err != nil { 
+	c.SessionTicketsDisabled = true 
+	} 
 } 
 
 func (c *Config) rand() io.Reader {