allow redis to be selected as session store type

src/session/session_manager.go

@@ -21,6 +21,7 @@ type StoreType int
 
 const (
 	InMemory StoreType = iota
+	Redis
 )
 
 func GetSessionManager() *SessionManager {
@@ -38,6 +39,11 @@ func (manager *SessionManager) SetStoreType(storeType StoreType) {
 			manager.store = NewMemoryStore()
 			break
 		}
+	case Redis:
+		{
+			manager.store = NewRedisStore()
+			break
+		}
 	}
 }