chore: remove close and raise errors

src/langchain_google_cloud_sql_mysql/mysql_engine.py

@@ -51,6 +51,7 @@ def _get_iam_principal_email(
     # call OAuth2 api to get IAM principal email associated with OAuth2 token
     url = f"https://oauth2.googleapis.com/tokeninfo?access_token={credentials.token}"
     response = requests.get(url)
+    response.raise_for_status()
     response_json: Dict = response.json()
     email = response_json.get("email")
     if email is None:
@@ -72,13 +73,6 @@ def __init__(
     ) -> None:
         self.engine = engine
 
-    def close(self) -> None:
-        """Utility method for closing the Cloud SQL Python Connector
-        background tasks.
-        """
-        if MySQLEngine._connector:
-            MySQLEngine._connector.close()
-
     @classmethod
     def from_instance(
         cls,

tests/integration/test_mysql_loader.py

@@ -55,7 +55,6 @@ def setup() -> Generator:
     with engine.connect() as conn:
         conn.execute(sqlalchemy.text(f"DROP TABLE IF EXISTS `{table_name}`"))
         conn.commit()
-    engine.close()
 
 
 def test_load_from_query(engine):