add some comments

filter/access_key.go

@@ -13,7 +13,7 @@ type AccessKeyPair struct {
 	Creator      string `yaml:"creator"   json:"creator,omitempty" property:"creator"`
 	Options      string `yaml:"options"   json:"options,omitempty" property:"options"`
 }
-
+// AccessKeyStorage
 // This SPI Extension support us to store our AccessKeyPair or load AccessKeyPair from other
 // storage, such as filesystem.
 type AccessKeyStorage interface {

filter/authenticator.go

@@ -5,6 +5,7 @@ import (
 	"github.com/apache/dubbo-go/protocol"
 )
 
+// Authenticator
 type Authenticator interface {
 
 	// give a sign to request

filter/filter_impl/auth/accesskey_storage.go

@@ -8,6 +8,7 @@ import (
 	"github.com/apache/dubbo-go/protocol"
 )
 
+// DefaultAccesskeyStorage
 // The default implementation of AccesskeyStorage
 type DefaultAccesskeyStorage struct {
 }

filter/filter_impl/auth/consumer_sign.go

@@ -12,6 +12,7 @@ import (
 	"github.com/apache/dubbo-go/protocol"
 )
 
+// ConsumerSignFilter
 // This filter is working for signing the request on consumer side
 type ConsumerSignFilter struct {
 }

filter/filter_impl/auth/default_authenticator.go

@@ -20,6 +20,7 @@ func init() {
 	extension.SetAuthenticator(constant.DEFAULT_AUTHENTICATOR, GetDefaultAuthenticator)
 }
 
+// DefaultAuthenticator
 // The default implemetation of Authenticator
 type DefaultAuthenticator struct {
 }

filter/filter_impl/auth/provider_auth.go

@@ -9,6 +9,7 @@ import (
 	"github.com/apache/dubbo-go/protocol"
 )
 
+// ProviderAuthFilter
 // This filter is used to verify the correctness of the signature on provider side
 type ProviderAuthFilter struct {
 }