text: # -*- coding: utf-8 -*-
  # Copyright 2020 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 warnings
  from typing import Callable, Dict, Optional, Sequence, Tuple, Union
  
  from google.api_core import grpc_helpers
  from google.api_core import gapic_v1
  import google.auth  # type: ignore
  from google.auth import credentials as ga_credentials  # type: ignore
  from google.auth.transport.grpc import SslCredentials  # type: ignore
  
  import grpc  # type: ignore
  
  from google.cloud.bigtable_v2.types import bigtable
  from .base import BigtableTransport, DEFAULT_CLIENT_INFO
  
  
  class BigtableGrpcTransport(BigtableTransport):
      """gRPC backend transport for Bigtable.
  
      Service for reading from and writing to existing Bigtable
      tables.
  
      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 protocol buffers over the wire using gRPC (which is built on
      top of HTTP/2); the ``grpcio`` package must be installed.
      """
  
      _stubs: Dict[str, Callable]
  
      def __init__(
          self,
          *,
          host: str = "bigtable.googleapis.com",
          credentials: ga_credentials.Credentials = None,
          credentials_file: str = None,
          scopes: Sequence[str] = None,
          channel: grpc.Channel = None,
          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,
          always_use_jwt_access: Optional[bool] = False,
      ) -> 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.
                  This argument is ignored if ``channel`` is provided.
              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.
              channel (Optional[grpc.Channel]): A ``Channel`` instance through
                  which to make calls.
              api_mtls_endpoint (Optional[str]): Deprecated. The mutual TLS endpoint.
                  If provided, it overrides the ``host`` argument and tries to create
                  a mutual TLS channel with client SSL credentials from
                  ``client_cert_source`` or application default SSL credentials.
              client_cert_source (Optional[Callable[[], Tuple[bytes, bytes]]]):
                  Deprecated. A callback to provide client SSL certificate bytes and
                  private key bytes, both in PEM format. It is ignored if
                  ``api_mtls_endpoint`` is None.
              ssl_channel_credentials (grpc.ChannelCredentials): SSL credentials
                  for the 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 a 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):
                  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.
              always_use_jwt_access (Optional[bool]): Whether self signed JWT should
                  be used for service account credentials.
  
          Raises:
            google.auth.exceptions.MutualTLSChannelError: If mutual TLS transport
                creation failed for any reason.
            google.api_core.exceptions.DuplicateCredentialArgs: If both ``credentials``
                and ``credentials_file`` are passed.
          """
          self._grpc_channel = None
          self._ssl_channel_credentials = ssl_channel_credentials
          self._stubs: Dict[str, Callable] = {}
  
          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:
              # Ignore credentials if a channel was passed.
              credentials = False
              # If a channel was explicitly provided, set it.
              self._grpc_channel = channel
              self._ssl_channel_credentials = None
  
          else:
              if api_mtls_endpoint:
                  host = api_mtls_endpoint
  
                  # Create SSL credentials with client_cert_source or application
                  # default SSL credentials.
                  if client_cert_source:
                      cert, key = client_cert_source()
                      self._ssl_channel_credentials = grpc.ssl_channel_credentials(
                          certificate_chain=cert, private_key=key
                      )
                  else:
                      self._ssl_channel_credentials = SslCredentials().ssl_credentials
  
              else:
                  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
                      )
  
          # The base transport sets the host, credentials and scopes
          super().__init__(
              host=host,
              credentials=credentials,
              credentials_file=credentials_file,
              scopes=scopes,
              quota_project_id=quota_project_id,
              client_info=client_info,
              always_use_jwt_access=always_use_jwt_access,
          )
  
          if not self._grpc_channel:
              self._grpc_channel = type(self).create_channel(
                  self._host,
                  credentials=self._credentials,
                  credentials_file=credentials_file,
                  scopes=self._scopes,
                  ssl_credentials=self._ssl_channel_credentials,
                  quota_project_id=quota_project_id,
                  options=[
                      ("grpc.max_send_message_length", -1),
                      ("grpc.max_receive_message_length", -1),
                  ],
              )
  
          # Wrap messages. This must be done after self._grpc_channel exists
          self._prep_wrapped_messages(client_info)
  
      @classmethod
      def create_channel(
          cls,
          host: str = "bigtable.googleapis.com",
          credentials: ga_credentials.Credentials = None,
          credentials_file: str = None,
          scopes: Optional[Sequence[str]] = None,
          quota_project_id: Optional[str] = None,
          **kwargs,
      ) -> grpc.Channel:
          """Create and return a gRPC channel object.
          Args:
              host (Optional[str]): The host for the channel to use.
              credentials (Optional[~.Credentials]): The
                  authorization credentials to attach to requests. These
                  credentials identify this 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 mutually exclusive with credentials.
              scopes (Optional[Sequence[str]]): A optional list of scopes needed for this
                  service. These are only used when credentials are not specified and
                  are passed to :func:`google.auth.default`.
              quota_project_id (Optional[str]): An optional project to use for billing
                  and quota.
              kwargs (Optional[dict]): Keyword arguments, which are passed to the
                  channel creation.
          Returns:
              grpc.Channel: A gRPC channel object.
  
          Raises:
              google.api_core.exceptions.DuplicateCredentialArgs: If both ``credentials``
                and ``credentials_file`` are passed.
          """
  
          return grpc_helpers.create_channel(
              host,
              credentials=credentials,
              credentials_file=credentials_file,
              quota_project_id=quota_project_id,
              default_scopes=cls.AUTH_SCOPES,
              scopes=scopes,
              default_host=cls.DEFAULT_HOST,
              **kwargs,
          )
  
      @property
      def grpc_channel(self) -> grpc.Channel:
          """Return the channel designed to connect to this service.
          """
          return self._grpc_channel
  
      @property
      def read_rows(
          self,
      ) -> Callable[[bigtable.ReadRowsRequest], bigtable.ReadRowsResponse]:
          r"""Return a callable for the read rows method over gRPC.
  
          Streams back the contents of all requested rows in
          key order, optionally applying the same Reader filter to
          each. Depending on their size, rows and cells may be
          broken up across multiple responses, but atomicity of
          each row will still be preserved. See the
          ReadRowsResponse documentation for details.
  
          Returns:
              Callable[[~.ReadRowsRequest],
                      ~.ReadRowsResponse]:
                  A function that, when called, will call the underlying RPC
                  on the server.
          """
          # Generate a "stub function" on-the-fly which will actually make
          # the request.
          # gRPC handles serialization and deserialization, so we just need
          # to pass in the functions for each.
          if "read_rows" not in self._stubs:
              self._stubs["read_rows"] = self.grpc_channel.unary_stream(
                  "/google.bigtable.v2.Bigtable/ReadRows",
                  request_serializer=bigtable.ReadRowsRequest.serialize,
                  response_deserializer=bigtable.ReadRowsResponse.deserialize,
              )
          return self._stubs["read_rows"]
  
      @property
      def sample_row_keys(
          self,
      ) -> Callable[[bigtable.SampleRowKeysRequest], bigtable.SampleRowKeysResponse]:
          r"""Return a callable for the sample row keys method over gRPC.
  
          Returns a sample of row keys in the table. The
          returned row keys will delimit contiguous sections of
          the table of approximately equal size, which can be used
          to break up the data for distributed tasks like
          mapreduces.
  
          Returns:
              Callable[[~.SampleRowKeysRequest],
                      ~.SampleRowKeysResponse]:
                  A function that, when called, will call the underlying RPC
                  on the server.
          """
          # Generate a "stub function" on-the-fly which will actually make
          # the request.
          # gRPC handles serialization and deserialization, so we just need
          # to pass in the functions for each.
          if "sample_row_keys" not in self._stubs:
              self._stubs["sample_row_keys"] = self.grpc_channel.unary_stream(
                  "/google.bigtable.v2.Bigtable/SampleRowKeys",
                  request_serializer=bigtable.SampleRowKeysRequest.serialize,
                  response_deserializer=bigtable.SampleRowKeysResponse.deserialize,
              )
          return self._stubs["sample_row_keys"]
  
      @property
      def mutate_row(
          self,
      ) -> Callable[[bigtable.MutateRowRequest], bigtable.MutateRowResponse]:
          r"""Return a callable for the mutate row method over gRPC.
  
          Mutates a row atomically. Cells already present in the row are
          left unchanged unless explicitly changed by ``mutation``.
  
          Returns:
              Callable[[~.MutateRowRequest],
                      ~.MutateRowResponse]:
                  A function that, when called, will call the underlying RPC
                  on the server.
          """
          # Generate a "stub function" on-the-fly which will actually make
          # the request.
          # gRPC handles serialization and deserialization, so we just need
          # to pass in the functions for each.
          if "mutate_row" not in self._stubs:
              self._stubs["mutate_row"] = self.grpc_channel.unary_unary(
                  "/google.bigtable.v2.Bigtable/MutateRow",
                  request_serializer=bigtable.MutateRowRequest.serialize,
                  response_deserializer=bigtable.MutateRowResponse.deserialize,
              )
          return self._stubs["mutate_row"]
  
      @property
      def mutate_rows(
          self,
      ) -> Callable[[bigtable.MutateRowsRequest], bigtable.MutateRowsResponse]:
          r"""Return a callable for the mutate rows method over gRPC.
  
          Mutates multiple rows in a batch. Each individual row
          is mutated atomically as in MutateRow, but the entire
          batch is not executed atomically.
  
          Returns:
              Callable[[~.MutateRowsRequest],
                      ~.MutateRowsResponse]:
                  A function that, when called, will call the underlying RPC
                  on the server.
          """
          # Generate a "stub function" on-the-fly which will actually make
          # the request.
          # gRPC handles serialization and deserialization, so we just need
          # to pass in the functions for each.
          if "mutate_rows" not in self._stubs:
              self._stubs["mutate_rows"] = self.grpc_channel.unary_stream(
                  "/google.bigtable.v2.Bigtable/MutateRows",
                  request_serializer=bigtable.MutateRowsRequest.serialize,
                  response_deserializer=bigtable.MutateRowsResponse.deserialize,
              )
          return self._stubs["mutate_rows"]
  
      @property
      def check_and_mutate_row(
          self,
      ) -> Callable[
          [bigtable.CheckAndMutateRowRequest], bigtable.CheckAndMutateRowResponse
      ]:
          r"""Return a callable for the check and mutate row method over gRPC.
  
          Mutates a row atomically based on the output of a
          predicate Reader filter.
  
          Returns:
              Callable[[~.CheckAndMutateRowRequest],
                      ~.CheckAndMutateRowResponse]:
                  A function that, when called, will call the underlying RPC
                  on the server.
          """
          # Generate a "stub function" on-the-fly which will actually make
          # the request.
          # gRPC handles serialization and deserialization, so we just need
          # to pass in the functions for each.
          if "check_and_mutate_row" not in self._stubs:
              self._stubs["check_and_mutate_row"] = self.grpc_channel.unary_unary(
                  "/google.bigtable.v2.Bigtable/CheckAndMutateRow",
                  request_serializer=bigtable.CheckAndMutateRowRequest.serialize,
                  response_deserializer=bigtable.CheckAndMutateRowResponse.deserialize,
              )
          return self._stubs["check_and_mutate_row"]
  
      @property
      def read_modify_write_row(
          self,
      ) -> Callable[
          [bigtable.ReadModifyWriteRowRequest], bigtable.ReadModifyWriteRowResponse
      ]:
          r"""Return a callable for the read modify write row method over gRPC.
  
          Modifies a row atomically on the server. The method
          reads the latest existing timestamp and value from the
          specified columns and writes a new entry based on pre-
          defined read/modify/write rules. The new value for the
          timestamp is the greater of the existing timestamp or
          the current server time. The method returns the new
          contents of all modified cells.
  
          Returns:
              Callable[[~.ReadModifyWriteRowRequest],
                      ~.ReadModifyWriteRowResponse]:
                  A function that, when called, will call the underlying RPC
                  on the server.
          """
          # Generate a "stub function" on-the-fly which will actually make
          # the request.
          # gRPC handles serialization and deserialization, so we just need
          # to pass in the functions for each.
          if "read_modify_write_row" not in self._stubs:
              self._stubs["read_modify_write_row"] = self.grpc_channel.unary_unary(
                  "/google.bigtable.v2.Bigtable/ReadModifyWriteRow",
                  request_serializer=bigtable.ReadModifyWriteRowRequest.serialize,
                  response_deserializer=bigtable.ReadModifyWriteRowResponse.deserialize,
              )
          return self._stubs["read_modify_write_row"]
  
      def close(self):
          self.grpc_channel.close()
  
  
  __all__ = ("BigtableGrpcTransport",)
  