add GetProvider

session/session.go

@@ -81,6 +81,15 @@ func Register(name string, provide Provider) {
 	provides[name] = provide
 }
 
+//GetProvider
+func GetProvider(name string) (Provider, error) {
+	provider, ok := provides[name]
+	if !ok {
+		return nil, fmt.Errorf("session: unknown provide %q (forgotten import?)", name)
+	}
+	return provider, nil
+}
+
 // ManagerConfig define the session config
 type ManagerConfig struct {
 	CookieName              string `json:"cookieName"`