Make retry config private (#8613)

Signed-off-by: Ngodchen <qingxiang.chen@zilliz.com>

internal/util/retry/options.go

@@ -13,30 +13,30 @@ package retry
 
 import "time"
 
-type Config struct {
+type config struct {
 	attempts     uint
 	sleep        time.Duration
 	maxSleepTime time.Duration
 }
 
-func newDefaultConfig() *Config {
-	return &Config{
+func newDefaultConfig() *config {
+	return &config{
 		attempts:     uint(10),
 		sleep:        200 * time.Millisecond,
 		maxSleepTime: 3 * time.Second,
 	}
 }
 
-type Option func(*Config)
+type Option func(*config)
 
 func Attempts(attempts uint) Option {
-	return func(c *Config) {
+	return func(c *config) {
 		c.attempts = attempts
 	}
 }
 
 func Sleep(sleep time.Duration) Option {
-	return func(c *Config) {
+	return func(c *config) {
 		c.sleep = sleep
 		// ensure max retry interval is always larger than retry interval
 		if c.sleep*2 > c.maxSleepTime {
@@ -46,7 +46,7 @@ func Sleep(sleep time.Duration) Option {
 }
 
 func MaxSleepTime(maxSleepTime time.Duration) Option {
-	return func(c *Config) {
+	return func(c *config) {
 		// ensure max retry interval is always larger than retry interval
 		if c.sleep*2 > maxSleepTime {
 			c.maxSleepTime = 2 * c.sleep