doc: More godoc desc

storage.go

@@ -12,13 +12,15 @@ type MemoryStore struct {
 	expiresTime  time.Time
 }
 
+// Token returns valid token.
 func (s *MemoryStore) Token() string {
 	if time.Now().Before(s.expiresTime) {
 		return s.token
 	}
 	return ""
 }
 
+// Refresh token
 func (s *MemoryStore) Refresh(c *Client) (err error) {
 	r := &TokenRequest{}
 	if s.refreshToken != "" {

token.go

@@ -2,18 +2,22 @@ package tuyacloud
 
 import "net/http"
 
+// TokenRequest manages token refresh method.
 type TokenRequest struct {
 	refresh string
 }
 
+// Method for Request.Method()
 func (t *TokenRequest) Method() string {
 	return http.MethodGet
 }
 
+// SetRefresh refresh token.
 func (t *TokenRequest) SetRefresh(token string) {
 	t.refresh = token
 }
 
+// URL for Request.URL()
 func (t *TokenRequest) URL() string {
 	uri := "/v1.0/token"
 	if t.refresh != "" {
@@ -24,6 +28,7 @@ func (t *TokenRequest) URL() string {
 	return uri
 }
 
+// TokenResponse for token response from tuya server.
 type TokenResponse struct {
 	ExpireTime   int    `json:"expire_time"`
 	UID          string `json:"uid"`