mypy fixes for recent changes to mysql.connector package

src/admin/python/lsst/qserv/admin/cli/_integration_test.py

@@ -101,7 +101,7 @@ def get_databases() -> List[str]:
         ) as connection:
             with closing(connection.cursor()) as cursor:
                 cursor.execute("show databases;")
-                return [row[0] for row in cursor.fetchall()]
+                return [str(row[0]) for row in cursor.fetchall()]
 
     databases = get_databases()
     checkdb = "qservMeta"

src/admin/python/lsst/qserv/admin/itest_load.py

@@ -28,12 +28,12 @@
 import json
 import logging
 import mysql.connector
-from mysql.connector.cursor import MySQLCursor
+from mysql.connector.abstracts import MySQLConnectionAbstract, MySQLCursorAbstract
 import os
 import shutil
 import subprocess
 from tempfile import TemporaryDirectory
-from typing import Any, Dict, Generator, List, NamedTuple, Optional, Tuple
+from typing import Any, Dict, Generator, List, NamedTuple, Optional, Tuple, Union, cast
 import yaml
 
 from .constants import tmp_data_dir
@@ -57,7 +57,7 @@ def unzip(source: str, destination: str) -> None:
         shutil.copyfileobj(_source, _target)
 
 
-def execute(cursor: MySQLCursor, stmt: str, multi: bool = False) -> None:
+def execute(cursor: MySQLCursorAbstract, stmt: str, multi: bool = False) -> None:
     """Execute a statement in a cursor, and clean up the cursor so it can be
     closed without causing warnings on the server."""
     warnings = []
@@ -73,6 +73,11 @@ def execute(cursor: MySQLCursor, stmt: str, multi: bool = False) -> None:
         cursors = [cursor]
 
     for cursor in cursors:
+        # Cast here because MySQLCursorAbtract does not have with_rows for some reason, even though both of
+        # its subclasses do...
+        cursor = cast(
+            Union[mysql.connector.cursor.MySQLCursor, mysql.connector.cursor_cext.CMySQLCursor], cursor
+        )
         if cursor.with_rows:
             for row in cursor.fetchall():
                 results.append(row)
@@ -121,12 +126,12 @@ def _create_ref_db(ref_db_admin: str, name: str) -> None:
                 execute(cursor, stmt)
 
 
-def _create_ref_table(cnx: mysql.connector.connection, db: str, schema_file: str) -> None:
+def _create_ref_table(cnx: MySQLConnectionAbstract, db: str, schema_file: str) -> None:
     """Create a table in the mysql database used for integration test reference.
 
     Parameters
     ----------
-    cnx : `mysql.connector.connection`
+    cnx : `mysql.connector.abstracts.MySQLConnectionAbstract`
         Connection to the reference database that has permission to create a
         table.
     db : `str`
@@ -145,14 +150,12 @@ def _create_ref_table(cnx: mysql.connector.connection, db: str, schema_file: str
             execute(cursor, f.read(), multi=True)
 
 
-def _load_ref_data(
-    cnx: mysql.connector.connection, data_file: str, db: str, table: LoadTable
-) -> None:
+def _load_ref_data(cnx: MySQLConnectionAbstract, data_file: str, db: str, table: LoadTable) -> None:
     """Load database data into the reference database.
 
     Parameters
     ----------
-    cnx : `mysql.connector.connection`
+    cnx : `mysql.connector.abstracts.MySQLConnectionAbstract`
         Connection to the reference database that has permission to load data
         into the table.
     data_file : `str`

src/admin/python/lsst/qserv/admin/mysql_connection.py

@@ -25,6 +25,7 @@
 
 import logging
 import mysql.connector
+from typing import cast
 from urllib.parse import urlparse
 
 _log = logging.getLogger(__name__)
@@ -34,7 +35,7 @@ def mysql_connection(
     uri: str,
     get_warnings: bool = True,
     local_infile: bool = False,
-) -> mysql.connector.connection:
+) -> mysql.connector.abstracts.MySQLConnectionAbstract:
     """Create a mysql.connection that is connected to a database.
 
     Parameters
@@ -58,12 +59,16 @@ def mysql_connection(
         user = parsed.username
         pw = parsed.password
     _log.debug("mysql_connection hostname:%s, port:%s, user:%s", hostname, port, user)
-    cnx = mysql.connector.connect(
-        user=user,
-        password=pw,
-        host=hostname,
-        port=port,
-        allow_local_infile=local_infile,
+    # Cast justified because no pool args passed here to connect(), so cnx cannot be PooledMySQLConnection
+    cnx = cast(
+        mysql.connector.abstracts.MySQLConnectionAbstract,
+        mysql.connector.connect(
+            user=user,
+            password=pw,
+            host=hostname,
+            port=port,
+            allow_local_infile=local_infile,
+        ),
     )
     cnx.get_warnings = get_warnings
     return cnx

src/admin/python/lsst/qserv/admin/watcher.py

@@ -26,7 +26,7 @@
 import logging
 import requests
 from time import sleep
-from typing import List, Sequence, Set, Type, Union
+from typing import List, Sequence, Set, Type, Union, Any
 
 _log = logging.getLogger(__name__)
 
@@ -168,7 +168,7 @@ def notify(self, msg: str) -> None:
             _log.error(f"Failed to send notification {msg}, exception: {e}")
         _log.debug(f"Sent notification: {msg}")
 
-    def query(self, uri: str, stmt: str) -> List[Sequence[str]]:
+    def query(self, uri: str, stmt: str) -> Sequence[Any]:
         """Execute a mysql query at the provided URI
 
         Parameters

src/replica/python/replicaConfig.py

@@ -23,6 +23,7 @@
 from contextlib import closing
 import mysql.connector
 import logging
+from typing import cast
 from urllib.parse import urlparse
 
 from lsst.qserv.admin.backoff import qserv_backoff, on_backoff
@@ -44,11 +45,15 @@ def applyConfiguration(connection: str, sql: str) -> None:
     """Apply configuration sql to the replication controller database."""
     c = urlparse(connection)
     with closing(
-        mysql.connector.connect(
-            user=c.username,
-            password=c.password,
-            host=c.hostname,
-            port=c.port,
+        # Cast justified because no pool args passed here to connect(), so cannot be PooledMySQLConnection
+        cast(
+            mysql.connector.abstracts.MySQLConnectionAbstract,
+            mysql.connector.connect(
+                user=c.username,
+                password=c.password,
+                host=c.hostname,
+                port=c.port,
+            ),
         )
     ) as cnx:
         cnx.database = replicaDb

src/schema/python/schemaMigMgr.py

@@ -34,7 +34,7 @@
 import jinja2
 import logging
 import mysql.connector
-from typing import Callable, Dict, Union
+from typing import Callable, Dict, Union, cast
 
 # MySQLInterfaceError can get thrown, we need to catch it.
 # It's not exposed as a public python object but *is* used in mysql.connector unit tests.
@@ -271,7 +271,7 @@ def max_migration_version(self) -> Optional[Version]:
         on_backoff=on_backoff(log=_log),
         max_time=max_backoff_sec,
     )
-    def _connect(self, connection: str) -> mysql.connector.connection:
+    def _connect(self, connection: str) -> mysql.connector.abstracts.MySQLConnectionAbstract:
         url = make_url(connection)
         # The database is not always guaranteed to exist yet (sometimes we connect and then create it)
         # so cache it, and it can be set in the connection before use when it is known to exist.
@@ -284,7 +284,11 @@ def _connect(self, connection: str) -> mysql.connector.connection:
             kwargs["unix_socket"] = url.query["socket"]
         else:
             kwargs.update(host=url.host, port=url.port)
-        return mysql.connector.connect(**kwargs)
+        # Cast justified because no pool args passed here to connect() so cannot be PooledMySQLConnection
+        return cast(
+            mysql.connector.abstracts.MySQLConnectionAbstract,
+            mysql.connector.connect(**kwargs),
+        )
 
     @backoff.on_exception(
         exception=mysql.connector.errors.DatabaseError,