feat: add client_cert_source_for_mtls argument to transports

google/cloud/bigquery_reservation_v1/services/reservation_service/client.py

@@ -363,21 +363,17 @@ def __init__(
             util.strtobool(os.getenv("GOOGLE_API_USE_CLIENT_CERTIFICATE", "false"))
         )
 
-        ssl_credentials = None
+        client_cert_source_func = None
         is_mtls = False
         if use_client_cert:
             if client_options.client_cert_source:
-                import grpc  # type: ignore
-
-                cert, key = client_options.client_cert_source()
-                ssl_credentials = grpc.ssl_channel_credentials(
-                    certificate_chain=cert, private_key=key
-                )
                 is_mtls = True
+                client_cert_source_func = client_options.client_cert_source
             else:
-                creds = SslCredentials()
-                is_mtls = creds.is_mtls
-                ssl_credentials = creds.ssl_credentials if is_mtls else None
+                is_mtls = mtls.has_default_client_cert_source()
+                client_cert_source_func = (
+                    mtls.default_client_cert_source() if is_mtls else None
+                )
 
         # Figure out which api endpoint to use.
         if client_options.api_endpoint is not None:
@@ -420,7 +416,7 @@ def __init__(
                 credentials_file=client_options.credentials_file,
                 host=api_endpoint,
                 scopes=client_options.scopes,
-                ssl_channel_credentials=ssl_credentials,
+                client_cert_source_for_mtls=client_cert_source_func,
                 quota_project_id=client_options.quota_project_id,
                 client_info=client_info,
             )

google/cloud/bigquery_reservation_v1/services/reservation_service/transports/grpc.py

@@ -75,6 +75,7 @@ def __init__(
         api_mtls_endpoint: str = None,
         client_cert_source: Callable[[], Tuple[bytes, bytes]] = None,
         ssl_channel_credentials: grpc.ChannelCredentials = None,
+        client_cert_source_for_mtls: Callable[[], Tuple[bytes, bytes]] = None,
         quota_project_id: Optional[str] = None,
         client_info: gapic_v1.client_info.ClientInfo = DEFAULT_CLIENT_INFO,
     ) -> None:
@@ -105,6 +106,10 @@ def __init__(
                 ``api_mtls_endpoint`` is None.
             ssl_channel_credentials (grpc.ChannelCredentials): SSL credentials
                 for grpc channel. It is ignored if ``channel`` is provided.
+            client_cert_source_for_mtls (Optional[Callable[[], Tuple[bytes, bytes]]]):
+                A callback to provide client certificate bytes and private key bytes,
+                both in PEM format. It is used to configure mutual TLS channel. It is
+                ignored if ``channel`` or ``ssl_channel_credentials`` is provided.
             quota_project_id (Optional[str]): An optional project to use for billing
                 and quota.
             client_info (google.api_core.gapic_v1.client_info.ClientInfo):
@@ -121,6 +126,11 @@ def __init__(
         """
         self._ssl_channel_credentials = ssl_channel_credentials
 
+        if api_mtls_endpoint:
+            warnings.warn("api_mtls_endpoint is deprecated", DeprecationWarning)
+        if client_cert_source:
+            warnings.warn("client_cert_source is deprecated", DeprecationWarning)
+
         if channel:
             # Sanity check: Ensure that channel and credentials are not both
             # provided.
@@ -130,11 +140,6 @@ def __init__(
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
         elif api_mtls_endpoint:
-            warnings.warn(
-                "api_mtls_endpoint and client_cert_source are deprecated",
-                DeprecationWarning,
-            )
-
             host = (
                 api_mtls_endpoint
                 if ":" in api_mtls_endpoint
@@ -178,12 +183,18 @@ def __init__(
                     scopes=self.AUTH_SCOPES, quota_project_id=quota_project_id
                 )
 
+            if client_cert_source_for_mtls and not ssl_channel_credentials:
+                cert, key = client_cert_source_for_mtls()
+                self._ssl_channel_credentials = grpc.ssl_channel_credentials(
+                    certificate_chain=cert, private_key=key
+                )
+
             # create a new channel. The provided one is ignored.
             self._grpc_channel = type(self).create_channel(
                 host,
                 credentials=credentials,
                 credentials_file=credentials_file,
-                ssl_credentials=ssl_channel_credentials,
+                ssl_credentials=self._ssl_channel_credentials,
                 scopes=scopes or self.AUTH_SCOPES,
                 quota_project_id=quota_project_id,
                 options=[

google/cloud/bigquery_reservation_v1/services/reservation_service/transports/grpc_asyncio.py

@@ -119,6 +119,7 @@ def __init__(
         api_mtls_endpoint: str = None,
         client_cert_source: Callable[[], Tuple[bytes, bytes]] = None,
         ssl_channel_credentials: grpc.ChannelCredentials = None,
+        client_cert_source_for_mtls: Callable[[], Tuple[bytes, bytes]] = None,
         quota_project_id=None,
         client_info: gapic_v1.client_info.ClientInfo = DEFAULT_CLIENT_INFO,
     ) -> None:
@@ -150,6 +151,10 @@ def __init__(
                 ``api_mtls_endpoint`` is None.
             ssl_channel_credentials (grpc.ChannelCredentials): SSL credentials
                 for grpc channel. It is ignored if ``channel`` is provided.
+            client_cert_source_for_mtls (Optional[Callable[[], Tuple[bytes, bytes]]]):
+                A callback to provide client certificate bytes and private key bytes,
+                both in PEM format. It is used to configure mutual TLS channel. It is
+                ignored if ``channel`` or ``ssl_channel_credentials`` is provided.
             quota_project_id (Optional[str]): An optional project to use for billing
                 and quota.
             client_info (google.api_core.gapic_v1.client_info.ClientInfo):	
@@ -166,6 +171,11 @@ def __init__(
         """
         self._ssl_channel_credentials = ssl_channel_credentials
 
+        if api_mtls_endpoint:
+            warnings.warn("api_mtls_endpoint is deprecated", DeprecationWarning)
+        if client_cert_source:
+            warnings.warn("client_cert_source is deprecated", DeprecationWarning)
+
         if channel:
             # Sanity check: Ensure that channel and credentials are not both
             # provided.
@@ -175,11 +185,6 @@ def __init__(
             self._grpc_channel = channel
             self._ssl_channel_credentials = None
         elif api_mtls_endpoint:
-            warnings.warn(
-                "api_mtls_endpoint and client_cert_source are deprecated",
-                DeprecationWarning,
-            )
-
             host = (
                 api_mtls_endpoint
                 if ":" in api_mtls_endpoint
@@ -223,12 +228,18 @@ def __init__(
                     scopes=self.AUTH_SCOPES, quota_project_id=quota_project_id
                 )
 
+            if client_cert_source_for_mtls and not ssl_channel_credentials:
+                cert, key = client_cert_source_for_mtls()
+                self._ssl_channel_credentials = grpc.ssl_channel_credentials(
+                    certificate_chain=cert, private_key=key
+                )
+
             # create a new channel. The provided one is ignored.
             self._grpc_channel = type(self).create_channel(
                 host,
                 credentials=credentials,
                 credentials_file=credentials_file,
-                ssl_credentials=ssl_channel_credentials,
+                ssl_credentials=self._ssl_channel_credentials,
                 scopes=scopes or self.AUTH_SCOPES,
                 quota_project_id=quota_project_id,
                 options=[

synth.metadata

@@ -4,15 +4,15 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/python-bigquery-reservation.git",
-        "sha": "555c4eeb6daa09b713632e92fbc8dc2a7aa37495"
+        "sha": "c30f0d02e4818306ee9f00a40a9e5b17657f70f2"
       }
     },
     {
       "git": {
         "name": "googleapis",
         "remote": "https://github.com/googleapis/googleapis.git",
-        "sha": "520682435235d9c503983a360a2090025aa47cd1",
-        "internalRef": "350246057"
+        "sha": "20712b8fe95001b312f62c6c5f33e3e3ec92cfaf",
+        "internalRef": "354996675"
       }
     },
     {