feat: add MongoDB client metadata (#27)

Author: alexbevi

pymongosql/connection.py

@@ -1,14 +1,23 @@
 # -*- coding: utf-8 -*-
 import logging
+from importlib.metadata import version as _get_version
 from typing import Any, Optional, Sequence, Type, Union
 
 from bson.codec_options import TypeRegistry
 from pymongo import MongoClient
 from pymongo.client_session import ClientSession
 from pymongo.collection import Collection
 from pymongo.database import Database
+from pymongo.driver_info import DriverInfo
 from pymongo.errors import ConnectionFailure
 
+try:
+    _VERSION = _get_version("pymongosql")
+except Exception:
+    _VERSION = None
+
+_DRIVER_INFO = DriverInfo(name="PyMongoSQL", version=_VERSION)
+
 from .common import BaseCursor
 from .cursor import Cursor
 from .error import DatabaseError, OperationalError
@@ -87,6 +96,10 @@ def __init__(
         if type_registry is not None:
             self._pymongo_params["type_registry"] = type_registry
 
+        # Inject MongoDB client metadata so the handshake identifies this library
+        if "driver" not in self._pymongo_params:
+            self._pymongo_params["driver"] = _DRIVER_INFO
+
         # Connection state
         self._autocommit = True
         self._in_transaction = False