feat: enable "rest" transport in Python for services supporting numeric enums (#177)

* feat: enable "rest" transport in Python for services supporting numeric enums

PiperOrigin-RevId: 508143576

Source-Link: googleapis/googleapis@7a702a9

Source-Link: https://github.com/googleapis/googleapis-gen/commit/6ad1279c0e7aa787ac6b66c9fd4a210692edffcd
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google/cloud/policytroubleshooter_v1/gapic_metadata.json

@@ -26,6 +26,16 @@
               ]
             }
           }
+        },
+        "rest": {
+          "libraryClient": "IamCheckerClient",
+          "rpcs": {
+            "TroubleshootIamPolicy": {
+              "methods": [
+                "troubleshoot_iam_policy"
+              ]
+            }
+          }
         }
       }
     }

google/cloud/policytroubleshooter_v1/services/iam_checker/client.py

@@ -51,6 +51,7 @@
 from .transports.base import DEFAULT_CLIENT_INFO, IamCheckerTransport
 from .transports.grpc import IamCheckerGrpcTransport
 from .transports.grpc_asyncio import IamCheckerGrpcAsyncIOTransport
+from .transports.rest import IamCheckerRestTransport
 
 
 class IamCheckerClientMeta(type):
@@ -64,6 +65,7 @@ class IamCheckerClientMeta(type):
     _transport_registry = OrderedDict()  # type: Dict[str, Type[IamCheckerTransport]]
     _transport_registry["grpc"] = IamCheckerGrpcTransport
     _transport_registry["grpc_asyncio"] = IamCheckerGrpcAsyncIOTransport
+    _transport_registry["rest"] = IamCheckerRestTransport
 
     def get_transport_class(
         cls,

google/cloud/policytroubleshooter_v1/services/iam_checker/transports/__init__.py

@@ -19,14 +19,18 @@
 from .base import IamCheckerTransport
 from .grpc import IamCheckerGrpcTransport
 from .grpc_asyncio import IamCheckerGrpcAsyncIOTransport
+from .rest import IamCheckerRestInterceptor, IamCheckerRestTransport
 
 # Compile a registry of transports.
 _transport_registry = OrderedDict()  # type: Dict[str, Type[IamCheckerTransport]]
 _transport_registry["grpc"] = IamCheckerGrpcTransport
 _transport_registry["grpc_asyncio"] = IamCheckerGrpcAsyncIOTransport
+_transport_registry["rest"] = IamCheckerRestTransport
 
 __all__ = (
     "IamCheckerTransport",
     "IamCheckerGrpcTransport",
     "IamCheckerGrpcAsyncIOTransport",
+    "IamCheckerRestTransport",
+    "IamCheckerRestInterceptor",
 )

google/cloud/policytroubleshooter_v1/services/iam_checker/transports/rest.py

@@ -0,0 +1,310 @@
+# -*- coding: utf-8 -*-
+# Copyright 2022 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+import dataclasses
+import json  # type: ignore
+import re
+from typing import Callable, Dict, List, Optional, Sequence, Tuple, Union
+import warnings
+
+from google.api_core import gapic_v1, path_template, rest_helpers, rest_streaming
+from google.api_core import exceptions as core_exceptions
+from google.api_core import retry as retries
+from google.auth import credentials as ga_credentials  # type: ignore
+from google.auth.transport.grpc import SslCredentials  # type: ignore
+from google.auth.transport.requests import AuthorizedSession  # type: ignore
+from google.protobuf import json_format
+import grpc  # type: ignore
+from requests import __version__ as requests_version
+
+try:
+    OptionalRetry = Union[retries.Retry, gapic_v1.method._MethodDefault]
+except AttributeError:  # pragma: NO COVER
+    OptionalRetry = Union[retries.Retry, object]  # type: ignore
+
+
+from google.cloud.policytroubleshooter_v1.types import checker
+
+from .base import DEFAULT_CLIENT_INFO as BASE_DEFAULT_CLIENT_INFO
+from .base import IamCheckerTransport
+
+DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
+    gapic_version=BASE_DEFAULT_CLIENT_INFO.gapic_version,
+    grpc_version=None,
+    rest_version=requests_version,
+)
+
+
+class IamCheckerRestInterceptor:
+    """Interceptor for IamChecker.
+
+    Interceptors are used to manipulate requests, request metadata, and responses
+    in arbitrary ways.
+    Example use cases include:
+    * Logging
+    * Verifying requests according to service or custom semantics
+    * Stripping extraneous information from responses
+
+    These use cases and more can be enabled by injecting an
+    instance of a custom subclass when constructing the IamCheckerRestTransport.
+
+    .. code-block:: python
+        class MyCustomIamCheckerInterceptor(IamCheckerRestInterceptor):
+            def pre_troubleshoot_iam_policy(self, request, metadata):
+                logging.log(f"Received request: {request}")
+                return request, metadata
+
+            def post_troubleshoot_iam_policy(self, response):
+                logging.log(f"Received response: {response}")
+                return response
+
+        transport = IamCheckerRestTransport(interceptor=MyCustomIamCheckerInterceptor())
+        client = IamCheckerClient(transport=transport)
+
+
+    """
+
+    def pre_troubleshoot_iam_policy(
+        self,
+        request: checker.TroubleshootIamPolicyRequest,
+        metadata: Sequence[Tuple[str, str]],
+    ) -> Tuple[checker.TroubleshootIamPolicyRequest, Sequence[Tuple[str, str]]]:
+        """Pre-rpc interceptor for troubleshoot_iam_policy
+
+        Override in a subclass to manipulate the request or metadata
+        before they are sent to the IamChecker server.
+        """
+        return request, metadata
+
+    def post_troubleshoot_iam_policy(
+        self, response: checker.TroubleshootIamPolicyResponse
+    ) -> checker.TroubleshootIamPolicyResponse:
+        """Post-rpc interceptor for troubleshoot_iam_policy
+
+        Override in a subclass to manipulate the response
+        after it is returned by the IamChecker server but before
+        it is returned to user code.
+        """
+        return response
+
+
+@dataclasses.dataclass
+class IamCheckerRestStub:
+    _session: AuthorizedSession
+    _host: str
+    _interceptor: IamCheckerRestInterceptor
+
+
+class IamCheckerRestTransport(IamCheckerTransport):
+    """REST backend transport for IamChecker.
+
+    IAM Policy Troubleshooter service.
+    This service helps you troubleshoot access issues for Google
+    Cloud resources.
+
+    This class defines the same methods as the primary client, so the
+    primary client can load the underlying transport implementation
+    and call it.
+
+    It sends JSON representations of protocol buffers over HTTP/1.1
+
+    """
+
+    def __init__(
+        self,
+        *,
+        host: str = "policytroubleshooter.googleapis.com",
+        credentials: Optional[ga_credentials.Credentials] = None,
+        credentials_file: Optional[str] = None,
+        scopes: Optional[Sequence[str]] = None,
+        client_cert_source_for_mtls: Optional[Callable[[], Tuple[bytes, bytes]]] = None,
+        quota_project_id: Optional[str] = None,
+        client_info: gapic_v1.client_info.ClientInfo = DEFAULT_CLIENT_INFO,
+        always_use_jwt_access: Optional[bool] = False,
+        url_scheme: str = "https",
+        interceptor: Optional[IamCheckerRestInterceptor] = None,
+        api_audience: Optional[str] = None,
+    ) -> None:
+        """Instantiate the transport.
+
+        Args:
+            host (Optional[str]):
+                 The hostname to connect to.
+            credentials (Optional[google.auth.credentials.Credentials]): The
+                authorization credentials to attach to requests. These
+                credentials identify the application to the service; if none
+                are specified, the client will attempt to ascertain the
+                credentials from the environment.
+
+            credentials_file (Optional[str]): A file with credentials that can
+                be loaded with :func:`google.auth.load_credentials_from_file`.
+                This argument is ignored if ``channel`` is provided.
+            scopes (Optional(Sequence[str])): A list of scopes. This argument is
+                ignored if ``channel`` is provided.
+            client_cert_source_for_mtls (Callable[[], Tuple[bytes, bytes]]): Client
+                certificate to configure mutual TLS HTTP channel. It is ignored
+                if ``channel`` 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):
+                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 are developing
+                your own client library.
+            always_use_jwt_access (Optional[bool]): Whether self signed JWT should
+                be used for service account credentials.
+            url_scheme: the protocol scheme for the API endpoint.  Normally
+                "https", but for testing or local servers,
+                "http" can be specified.
+        """
+        # Run the base constructor
+        # TODO(yon-mg): resolve other ctor params i.e. scopes, quota, etc.
+        # TODO: When custom host (api_endpoint) is set, `scopes` must *also* be set on the
+        # credentials object
+        maybe_url_match = re.match("^(?P<scheme>http(?:s)?://)?(?P<host>.*)$", host)
+        if maybe_url_match is None:
+            raise ValueError(
+                f"Unexpected hostname structure: {host}"
+            )  # pragma: NO COVER
+
+        url_match_items = maybe_url_match.groupdict()
+
+        host = f"{url_scheme}://{host}" if not url_match_items["scheme"] else host
+
+        super().__init__(
+            host=host,
+            credentials=credentials,
+            client_info=client_info,
+            always_use_jwt_access=always_use_jwt_access,
+            api_audience=api_audience,
+        )
+        self._session = AuthorizedSession(
+            self._credentials, default_host=self.DEFAULT_HOST
+        )
+        if client_cert_source_for_mtls:
+            self._session.configure_mtls_channel(client_cert_source_for_mtls)
+        self._interceptor = interceptor or IamCheckerRestInterceptor()
+        self._prep_wrapped_messages(client_info)
+
+    class _TroubleshootIamPolicy(IamCheckerRestStub):
+        def __hash__(self):
+            return hash("TroubleshootIamPolicy")
+
+        def __call__(
+            self,
+            request: checker.TroubleshootIamPolicyRequest,
+            *,
+            retry: OptionalRetry = gapic_v1.method.DEFAULT,
+            timeout: Optional[float] = None,
+            metadata: Sequence[Tuple[str, str]] = (),
+        ) -> checker.TroubleshootIamPolicyResponse:
+            r"""Call the troubleshoot iam policy method over HTTP.
+
+            Args:
+                request (~.checker.TroubleshootIamPolicyRequest):
+                    The request object. Request for
+                [TroubleshootIamPolicy][google.cloud.policytroubleshooter.v1.IamChecker.TroubleshootIamPolicy].
+
+                retry (google.api_core.retry.Retry): Designation of what errors, if any,
+                    should be retried.
+                timeout (float): The timeout for this request.
+                metadata (Sequence[Tuple[str, str]]): Strings which should be
+                    sent along with the request as metadata.
+
+            Returns:
+                ~.checker.TroubleshootIamPolicyResponse:
+                    Response for
+                [TroubleshootIamPolicy][google.cloud.policytroubleshooter.v1.IamChecker.TroubleshootIamPolicy].
+
+            """
+
+            http_options: List[Dict[str, str]] = [
+                {
+                    "method": "post",
+                    "uri": "/v1/iam:troubleshoot",
+                    "body": "*",
+                },
+            ]
+            request, metadata = self._interceptor.pre_troubleshoot_iam_policy(
+                request, metadata
+            )
+            pb_request = checker.TroubleshootIamPolicyRequest.pb(request)
+            transcoded_request = path_template.transcode(http_options, pb_request)
+
+            # Jsonify the request body
+
+            body = json_format.MessageToJson(
+                transcoded_request["body"],
+                including_default_value_fields=False,
+                use_integers_for_enums=True,
+            )
+            uri = transcoded_request["uri"]
+            method = transcoded_request["method"]
+
+            # Jsonify the query params
+            query_params = json.loads(
+                json_format.MessageToJson(
+                    transcoded_request["query_params"],
+                    including_default_value_fields=False,
+                    use_integers_for_enums=True,
+                )
+            )
+
+            query_params["$alt"] = "json;enum-encoding=int"
+
+            # Send the request
+            headers = dict(metadata)
+            headers["Content-Type"] = "application/json"
+            response = getattr(self._session, method)(
+                "{host}{uri}".format(host=self._host, uri=uri),
+                timeout=timeout,
+                headers=headers,
+                params=rest_helpers.flatten_query_params(query_params, strict=True),
+                data=body,
+            )
+
+            # In case of error, raise the appropriate core_exceptions.GoogleAPICallError exception
+            # subclass.
+            if response.status_code >= 400:
+                raise core_exceptions.from_http_response(response)
+
+            # Return the response
+            resp = checker.TroubleshootIamPolicyResponse()
+            pb_resp = checker.TroubleshootIamPolicyResponse.pb(resp)
+
+            json_format.Parse(response.content, pb_resp, ignore_unknown_fields=True)
+            resp = self._interceptor.post_troubleshoot_iam_policy(resp)
+            return resp
+
+    @property
+    def troubleshoot_iam_policy(
+        self,
+    ) -> Callable[
+        [checker.TroubleshootIamPolicyRequest], checker.TroubleshootIamPolicyResponse
+    ]:
+        # The return type is fine, but mypy isn't sophisticated enough to determine what's going on here.
+        # In C++ this would require a dynamic_cast
+        return self._TroubleshootIamPolicy(self._session, self._host, self._interceptor)  # type: ignore
+
+    @property
+    def kind(self) -> str:
+        return "rest"
+
+    def close(self):
+        self._session.close()
+
+
+__all__ = ("IamCheckerRestTransport",)