fix(main) Fix linting and undefined cases

Changelog:
- Fix linting issues
- Define `self.proxy` on the constructor
- Prevent issues with undefined variables

Author: Uziel Silva

google/cloud/sql/connector/connector.py

@@ -37,14 +37,14 @@
 from google.cloud.sql.connector.lazy import LazyRefreshCache
 from google.cloud.sql.connector.monitored_cache import MonitoredCache
 import google.cloud.sql.connector.pg8000 as pg8000
+from google.cloud.sql.connector.proxy import start_local_proxy
 import google.cloud.sql.connector.psycopg as psycopg
 import google.cloud.sql.connector.pymysql as pymysql
 import google.cloud.sql.connector.pytds as pytds
 from google.cloud.sql.connector.resolver import DefaultResolver
 from google.cloud.sql.connector.resolver import DnsResolver
 from google.cloud.sql.connector.utils import format_database_user
 from google.cloud.sql.connector.utils import generate_keys
-from google.cloud.sql.connector.proxy import start_local_proxy
 
 logger = logging.getLogger(name=__name__)
 
@@ -156,6 +156,7 @@ def __init__(
         # connection name string and enable_iam_auth boolean flag
         self._cache: dict[tuple[str, bool], MonitoredCache] = {}
         self._client: Optional[CloudSQLClient] = None
+        self._proxy: Optional[asyncio.Task] = None
 
         # initialize credentials
         scopes = ["https://www.googleapis.com/auth/sqlservice.admin"]
@@ -385,7 +386,7 @@ async def connect_async(
             # async drivers are unblocking and can be awaited directly
             if driver in ASYNC_DRIVERS:
                 return await connector(
-                    host,
+                    ip_address,
                     await conn_info.create_ssl_context(enable_iam_auth),
                     **kwargs,
                 )

google/cloud/sql/connector/proxy.py

@@ -14,11 +14,11 @@
 limitations under the License.
 """
 
-import socket
-import os
-import ssl
 import asyncio
+import os
 from pathlib import Path
+import socket
+import ssl
 from typing import Optional
 
 from google.cloud.sql.connector.exceptions import LocalProxyStartupError

google/cloud/sql/connector/psycopg.py

@@ -16,7 +16,6 @@
 
 import ssl
 from typing import Any, TYPE_CHECKING
-import threading
 
 SERVER_PROXY_PORT = 3307
 

tests/unit/test_psycopg.py

@@ -18,7 +18,8 @@
 import ssl
 from typing import Any
 
-from mock import patch, PropertyMock
+from mock import patch
+from mock import PropertyMock
 import pytest
 
 from google.cloud.sql.connector.psycopg import connect