feat: Allow users to explicitly configure universe domain (#737)

* feat: Allow users to explicitly configure universe domain

chore: Update gapic-generator-python to v1.14.0
PiperOrigin-RevId: 603108274

Source-Link: googleapis/googleapis@3d83e36

Source-Link: googleapis/googleapis-gen@baf5e9b
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* Update test_client_v1.py

* 🦉 Updates from OwlBot post-processor

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---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
Co-authored-by: Lingqing Gan <lingqing.gan@gmail.com>

google/cloud/bigquery_storage_v1/services/big_query_read/async_client.py

@@ -40,9 +40,9 @@
 from google.oauth2 import service_account  # type: ignore
 
 try:
-    OptionalRetry = Union[retries.AsyncRetry, gapic_v1.method._MethodDefault]
+    OptionalRetry = Union[retries.AsyncRetry, gapic_v1.method._MethodDefault, None]
 except AttributeError:  # pragma: NO COVER
-    OptionalRetry = Union[retries.AsyncRetry, object]  # type: ignore
+    OptionalRetry = Union[retries.AsyncRetry, object, None]  # type: ignore
 
 from google.cloud.bigquery_storage_v1.types import arrow
 from google.cloud.bigquery_storage_v1.types import avro
@@ -62,8 +62,12 @@ class BigQueryReadAsyncClient:
 
     _client: BigQueryReadClient
 
+    # Copy defaults from the synchronous client for use here.
+    # Note: DEFAULT_ENDPOINT is deprecated. Use _DEFAULT_ENDPOINT_TEMPLATE instead.
     DEFAULT_ENDPOINT = BigQueryReadClient.DEFAULT_ENDPOINT
     DEFAULT_MTLS_ENDPOINT = BigQueryReadClient.DEFAULT_MTLS_ENDPOINT
+    _DEFAULT_ENDPOINT_TEMPLATE = BigQueryReadClient._DEFAULT_ENDPOINT_TEMPLATE
+    _DEFAULT_UNIVERSE = BigQueryReadClient._DEFAULT_UNIVERSE
 
     read_session_path = staticmethod(BigQueryReadClient.read_session_path)
     parse_read_session_path = staticmethod(BigQueryReadClient.parse_read_session_path)
@@ -170,6 +174,25 @@ def transport(self) -> BigQueryReadTransport:
         """
         return self._client.transport
 
+    @property
+    def api_endpoint(self):
+        """Return the API endpoint used by the client instance.
+
+        Returns:
+            str: The API endpoint used by the client instance.
+        """
+        return self._client._api_endpoint
+
+    @property
+    def universe_domain(self) -> str:
+        """Return the universe domain used by the client instance.
+
+        Returns:
+            str: The universe domain used
+                by the client instance.
+        """
+        return self._client._universe_domain
+
     get_transport_class = functools.partial(
         type(BigQueryReadClient).get_transport_class, type(BigQueryReadClient)
     )
@@ -182,7 +205,7 @@ def __init__(
         client_options: Optional[ClientOptions] = None,
         client_info: gapic_v1.client_info.ClientInfo = DEFAULT_CLIENT_INFO,
     ) -> None:
-        """Instantiates the big query read client.
+        """Instantiates the big query read async client.
 
         Args:
             credentials (Optional[google.auth.credentials.Credentials]): The
@@ -193,23 +216,38 @@ def __init__(
             transport (Union[str, ~.BigQueryReadTransport]): The
                 transport to use. If set to None, a transport is chosen
                 automatically.
-            client_options (ClientOptions): Custom options for the client. It
-                won't take effect if a ``transport`` instance is provided.
-                (1) The ``api_endpoint`` property can be used to override the
-                default endpoint provided by the client. GOOGLE_API_USE_MTLS_ENDPOINT
-                environment variable can also be used to override the endpoint:
+            client_options (Optional[Union[google.api_core.client_options.ClientOptions, dict]]):
+                Custom options for the client.
+
+                1. The ``api_endpoint`` property can be used to override the
+                default endpoint provided by the client when ``transport`` is
+                not explicitly provided. Only if this property is not set and
+                ``transport`` was not explicitly provided, the endpoint is
+                determined by the GOOGLE_API_USE_MTLS_ENDPOINT environment
+                variable, which have one of the following values:
                 "always" (always use the default mTLS endpoint), "never" (always
-                use the default regular endpoint) and "auto" (auto switch to the
-                default mTLS endpoint if client certificate is present, this is
-                the default value). However, the ``api_endpoint`` property takes
-                precedence if provided.
-                (2) If GOOGLE_API_USE_CLIENT_CERTIFICATE environment variable
+                use the default regular endpoint) and "auto" (auto-switch to the
+                default mTLS endpoint if client certificate is present; this is
+                the default value).
+
+                2. If the GOOGLE_API_USE_CLIENT_CERTIFICATE environment variable
                 is "true", then the ``client_cert_source`` property can be used
-                to provide client certificate for mutual TLS transport. If
+                to provide a client certificate for mTLS transport. If
                 not provided, the default SSL client certificate will be used if
                 present. If GOOGLE_API_USE_CLIENT_CERTIFICATE is "false" or not
                 set, no client certificate will be used.
 
+                3. The ``universe_domain`` property can be used to override the
+                default "googleapis.com" universe. Note that ``api_endpoint``
+                property still takes precedence; and ``universe_domain`` is
+                currently not supported for mTLS.
+
+            client_info (google.api_core.gapic_v1.client_info.ClientInfo):
+                The client info used to send a user-agent string along with
+                API requests. If ``None``, then default info will be used.
+                Generally, you only need to set this if you're developing
+                your own client library.
+
         Raises:
             google.auth.exceptions.MutualTlsChannelError: If mutual TLS transport
                 creation failed for any reason.
@@ -372,6 +410,9 @@ async def sample_create_read_session():
             ),
         )
 
+        # Validate the universe domain.
+        self._client._validate_universe_domain()
+
         # Send the request.
         response = await rpc(
             request,
@@ -503,6 +544,9 @@ async def sample_read_rows():
             ),
         )
 
+        # Validate the universe domain.
+        self._client._validate_universe_domain()
+
         # Send the request.
         response = rpc(
             request,
@@ -602,6 +646,9 @@ async def sample_split_read_stream():
             gapic_v1.routing_header.to_grpc_metadata((("name", request.name),)),
         )
 
+        # Validate the universe domain.
+        self._client._validate_universe_domain()
+
         # Send the request.
         response = await rpc(
             request,