session consumer query함수 리턴 값의 애매함을 제거

session/impl_mongo.go

@@ -263,25 +263,25 @@ func (c *consumer_mongo) query_internal(sk storagekey) (*sessionMongo, bool, err
 	return nil, false, nil
 }
 
-func (c *consumer_mongo) Query(pk string) (Authorization, error) {
+func (c *consumer_mongo) Query(pk string) Authorization {
 	c.lock.Lock()
 	defer c.lock.Unlock()
 
 	sk := publickey_to_storagekey(publickey(pk))
 	si, _, err := c.query_internal(sk)
 	if err != nil {
-		return Authorization{}, err
+		return Authorization{}
 	}
 
 	if si == nil {
-		return Authorization{}, nil
+		return Authorization{}
 	}
 
 	if time.Now().After(si.Ts.Time().Add(c.ttl)) {
-		return Authorization{}, nil
+		return Authorization{}
 	}
 
-	return *si.Auth, nil
+	return *si.Auth
 }
 
 func (c *consumer_mongo) Touch(pk string) (Authorization, error) {