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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def create_sink( self, parent, sink, unique_writer_identity=None, retry=google.api_core.gapic_v1.method.DEFAULT, timeout=google.api_core.gapic_v1.method.DEFAULT, metadata=None, ):
 """ Creates a sink that exports specified log entries to a destination. The export of newly-ingested log entries begins immediately, unless the sink's ``writer_identity`` is not permitted to write to the destination. A sink can export log entries only from the resource owning the sink. Example: Args: parent (str):
 Required. The resource in which to create the sink: :: "projects/[PROJECT_ID]" "organizations/[ORGANIZATION_ID]" "billingAccounts/[BILLING_ACCOUNT_ID]" "folders/[FOLDER_ID]" Examples: ``"projects/my-logging-project"``, ``"organizations/123456789"``. sink (Union[dict, ~google.cloud.logging_v2.types.LogSink]):
 Required. The new sink, whose ``name`` parameter is a sink identifier that is not already in use. If a dict is provided, it must be of the same form as the protobuf message :class:`~google.cloud.logging_v2.types.LogSink` unique_writer_identity (bool):
 Optional. Determines the kind of IAM identity returned as ``writer_identity`` in the new sink. If this value is omitted or set to false, and if the sink's parent is a project, then the value returned as ``writer_identity`` is the same group or service account used by Logging before the addition of writer identities to this API. The sink's destination must be in the same project as the sink itself. If this field is set to true, or if the sink is owned by a non-project resource such as an organization, then the value of ``writer_identity`` will be a unique service account used only for exports from the new sink. For more information, see ``writer_identity`` in ``LogSink``. retry (Optional[google.api_core.retry.Retry]):
 A retry object used to retry requests. If ``None`` is specified, requests will not be retried. timeout (Optional[float]):
 The amount of time, in seconds, to wait for the request to complete. Note that if ``retry`` is specified, the timeout applies to each individual attempt. metadata (Optional[Sequence[Tuple[str, str]]]):
 Additional metadata that is provided to the method. Returns: A :class:`~google.cloud.logging_v2.types.LogSink` instance. Raises: google.api_core.exceptions.GoogleAPICallError: If the request failed for any reason. google.api_core.exceptions.RetryError: If the request failed due to a retryable error and retry attempts failed. ValueError: If the parameters are invalid. """

        # Wrap the transport method to add retry and timeout logic.
        if "create_sink" not in self._inner_api_calls:
            self._inner_api_calls[
                "create_sink"
            ] = google.api_core.gapic_v1.method.wrap_method(
                self.transport.create_sink,
                default_retry=self._method_configs["CreateSink"].retry,
                default_timeout=self._method_configs["CreateSink"].timeout,
                client_info=self._client_info,
            )

        request = logging_config_pb2.CreateSinkRequest(
            parent=parent, sink=sink, unique_writer_identity=unique_writer_identity
        )
        if metadata is None:
            metadata = []
        metadata = list(metadata)
        try:
            routing_header = [("parent", parent)]
        except AttributeError:
            pass
        else:
            routing_metadata = google.api_core.gapic_v1.routing_header.to_grpc_metadata(
                routing_header
            )
            metadata.append(routing_metadata)

        return self._inner_api_calls["create_sink"](
            request, retry=retry, timeout=timeout, metadata=metadata
        )