Added backoff retry

options.go

@@ -34,6 +34,10 @@ type Options struct {
 	// Default is to not retry failed commands.
 	MaxRetries int
 
+	// Retry using exponential backoff wait algorithm between each retry
+	// Default is 512 milliseconds; set to -1 to disable any backoff sleep
+	MaxRetryBackoff time.Duration
+
 	// Dial timeout for establishing new connections.
 	// Default is 5 seconds.
 	DialTimeout time.Duration
@@ -89,15 +93,17 @@ func (opt *Options) init() {
 	if opt.DialTimeout == 0 {
 		opt.DialTimeout = 5 * time.Second
 	}
-	if opt.ReadTimeout == 0 {
-		opt.ReadTimeout = 3 * time.Second
-	} else if opt.ReadTimeout == -1 {
+	switch opt.ReadTimeout {
+	case -1:
 		opt.ReadTimeout = 0
+	case 0:
+		opt.ReadTimeout = 3 * time.Second
 	}
-	if opt.WriteTimeout == 0 {
-		opt.WriteTimeout = opt.ReadTimeout
-	} else if opt.WriteTimeout == -1 {
+	switch opt.WriteTimeout {
+	case -1:
 		opt.WriteTimeout = 0
+	case 0:
+		opt.WriteTimeout = opt.ReadTimeout
 	}
 	if opt.PoolTimeout == 0 {
 		opt.PoolTimeout = opt.ReadTimeout + time.Second
@@ -108,6 +114,12 @@ func (opt *Options) init() {
 	if opt.IdleCheckFrequency == 0 {
 		opt.IdleCheckFrequency = time.Minute
 	}
+	switch opt.MaxRetryBackoff {
+	case -1:
+		opt.MaxRetryBackoff = 0
+	case 0:
+		opt.MaxRetryBackoff = 512 * time.Millisecond
+	}
 }
 
 // ParseURL parses a redis URL into options that can be used to connect to redis