text: # Copyright 2015 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.
  
  """Parent client for calling the Google Cloud Bigtable API.
  
  This is the base from which all interactions with the API occur.
  
  In the hierarchy of API concepts
  
  * a :class:`~google.cloud.bigtable.client.Client` owns an
    :class:`~google.cloud.bigtable.instance.Instance`
  * an :class:`~google.cloud.bigtable.instance.Instance` owns a
    :class:`~google.cloud.bigtable.table.Table`
  * a :class:`~google.cloud.bigtable.table.Table` owns a
    :class:`~.column_family.ColumnFamily`
  * a :class:`~google.cloud.bigtable.table.Table` owns a
    :class:`~google.cloud.bigtable.row.Row` (and all the cells in the row)
  """
  import os
  import warnings
  import grpc
  
  from google.api_core.gapic_v1 import client_info
  
  from google.cloud import bigtable_v2
  from google.cloud import bigtable_admin_v2
  
  from google.cloud.bigtable import __version__
  from google.cloud.bigtable.instance import Instance
  from google.cloud.bigtable.cluster import Cluster
  
  from google.cloud.client import ClientWithProject
  
  from google.cloud.bigtable_admin_v2 import enums
  from google.cloud.bigtable.cluster import _CLUSTER_NAME_RE
  from google.cloud.environment_vars import BIGTABLE_EMULATOR
  
  
  INSTANCE_TYPE_PRODUCTION = enums.Instance.Type.PRODUCTION
  INSTANCE_TYPE_DEVELOPMENT = enums.Instance.Type.DEVELOPMENT
  INSTANCE_TYPE_UNSPECIFIED = enums.Instance.Type.TYPE_UNSPECIFIED
  _CLIENT_INFO = client_info.ClientInfo(client_library_version=__version__)
  SPANNER_ADMIN_SCOPE = "https://www.googleapis.com/auth/spanner.admin"
  ADMIN_SCOPE = "https://www.googleapis.com/auth/bigtable.admin"
  """Scope for interacting with the Cluster Admin and Table Admin APIs."""
  DATA_SCOPE = "https://www.googleapis.com/auth/bigtable.data"
  """Scope for reading and writing table data."""
  READ_ONLY_SCOPE = "https://www.googleapis.com/auth/bigtable.data.readonly"
  """Scope for reading table data."""
  
  
  def _create_gapic_client(client_class, client_options=None):
      def inner(self):
          if self._emulator_host is None:
              return client_class(
                  credentials=self._credentials,
                  client_info=self._client_info,
                  client_options=client_options,
              )
          else:
              return client_class(
                  channel=self._emulator_channel, client_info=self._client_info
              )
  
      return inner
  
  
  class Client(ClientWithProject):
      """Client for interacting with Google Cloud Bigtable API.
  
      .. note::
  
          Since the Cloud Bigtable API requires the gRPC transport, no
          ``_http`` argument is accepted by this class.
  
      :type project: :class:`str` or :func:`unicode <unicode>`
      :param project: (Optional) The ID of the project which owns the
                      instances, tables and data. If not provided, will
                      attempt to determine from the environment.
  
      :type credentials: :class:`~google.auth.credentials.Credentials`
      :param credentials: (Optional) The OAuth2 Credentials to use for this
                          client. If not passed, falls back to the default
                          inferred from the environment.
  
      :type read_only: bool
      :param read_only: (Optional) Boolean indicating if the data scope should be
                        for reading only (or for writing as well). Defaults to
                        :data:`False`.
  
      :type admin: bool
      :param admin: (Optional) Boolean indicating if the client will be used to
                    interact with the Instance Admin or Table Admin APIs. This
                    requires the :const:`ADMIN_SCOPE`. Defaults to :data:`False`.
  
      :type: client_info: :class:`google.api_core.gapic_v1.client_info.ClientInfo`
      :param client_info:
          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 library
          or partner tool.
  
      :type client_options: :class:`~google.api_core.client_options.ClientOptions`
          or :class:`dict`
      :param client_options: (Optional) Client options used to set user options
          on the client. API Endpoint should be set through client_options.
  
      :type admin_client_options:
          :class:`~google.api_core.client_options.ClientOptions` or :class:`dict`
      :param admin_client_options: (Optional) Client options used to set user
          options on the client. API Endpoint for admin operations should be set
          through admin_client_options.
  
      :type channel: :instance: grpc.Channel
      :param channel (grpc.Channel): (Optional) DEPRECATED:
              A ``Channel`` instance through which to make calls.
              This argument is mutually exclusive with ``credentials``;
              providing both will raise an exception. No longer used.
  
      :raises: :class:`ValueError <exceptions.ValueError>` if both ``read_only``
               and ``admin`` are :data:`True`
      """
  
      _table_data_client = None
      _table_admin_client = None
      _instance_admin_client = None
  
      def __init__(
          self,
          project=None,
          credentials=None,
          read_only=False,
          admin=False,
          client_info=_CLIENT_INFO,
          client_options=None,
          admin_client_options=None,
          channel=None,
      ):
          if read_only and admin:
              raise ValueError(
                  "A read-only client cannot also perform" "administrative actions."
              )
  
          # NOTE: We set the scopes **before** calling the parent constructor.
          #       It **may** use those scopes in ``with_scopes_if_required``.
          self._read_only = bool(read_only)
          self._admin = bool(admin)
          self._client_info = client_info
          self._emulator_host = os.getenv(BIGTABLE_EMULATOR)
          self._emulator_channel = None
  
          if self._emulator_host is not None:
              self._emulator_channel = grpc.insecure_channel(self._emulator_host)
  
          if channel is not None:
              warnings.warn(
                  "'channel' is deprecated and no longer used.",
                  DeprecationWarning,
                  stacklevel=2,
              )
  
          self._client_options = client_options
          self._admin_client_options = admin_client_options
          self._channel = channel
          self.SCOPE = self._get_scopes()
          super(Client, self).__init__(
              project=project,
              credentials=credentials,
              client_options=client_options,
          )
  
      def _get_scopes(self):
          """Get the scopes corresponding to admin / read-only state.
  
          Returns:
              Tuple[str, ...]: The tuple of scopes.
          """
          if self._read_only:
              scopes = (READ_ONLY_SCOPE,)
          else:
              scopes = (DATA_SCOPE,)
  
          if self._admin:
              scopes += (ADMIN_SCOPE,)
  
          return scopes
  
      @property
      def project_path(self):
          """Project name to be used with Instance Admin API.
  
          .. note::
  
              This property will not change if ``project`` does not, but the
              return value is not cached.
  
          For example:
  
          .. literalinclude:: snippets.py
              :start-after: [START bigtable_project_path]
              :end-before: [END bigtable_project_path]
              :dedent: 4
  
          The project name is of the form
  
              ``"projects/{project}"``
  
          :rtype: str
          :returns: Return a fully-qualified project string.
          """
          return self.instance_admin_client.project_path(self.project)
  
      @property
      def table_data_client(self):
          """Getter for the gRPC stub used for the Table Admin API.
  
          For example:
  
          .. literalinclude:: snippets.py
              :start-after: [START bigtable_table_data_client]
              :end-before: [END bigtable_table_data_client]
              :dedent: 4
  
          :rtype: :class:`.bigtable_v2.BigtableClient`
          :returns: A BigtableClient object.
          """
          if self._table_data_client is None:
              klass = _create_gapic_client(
                  bigtable_v2.BigtableClient, client_options=self._client_options
              )
              self._table_data_client = klass(self)
          return self._table_data_client
  
      @property
      def table_admin_client(self):
          """Getter for the gRPC stub used for the Table Admin API.
  
          For example:
  
          .. literalinclude:: snippets.py
              :start-after: [START bigtable_table_admin_client]
              :end-before: [END bigtable_table_admin_client]
              :dedent: 4
  
          :rtype: :class:`.bigtable_admin_pb2.BigtableTableAdmin`
          :returns: A BigtableTableAdmin instance.
          :raises: :class:`ValueError <exceptions.ValueError>` if the current
                   client is not an admin client or if it has not been
                   :meth:`start`-ed.
          """
          if self._table_admin_client is None:
              if not self._admin:
                  raise ValueError("Client is not an admin client.")
              klass = _create_gapic_client(
                  bigtable_admin_v2.BigtableTableAdminClient,
                  client_options=self._admin_client_options,
              )
              self._table_admin_client = klass(self)
          return self._table_admin_client
  
      @property
      def instance_admin_client(self):
          """Getter for the gRPC stub used for the Table Admin API.
  
          For example:
  
          .. literalinclude:: snippets.py
              :start-after: [START bigtable_instance_admin_client]
              :end-before: [END bigtable_instance_admin_client]
              :dedent: 4
  
          :rtype: :class:`.bigtable_admin_pb2.BigtableInstanceAdmin`
          :returns: A BigtableInstanceAdmin instance.
          :raises: :class:`ValueError <exceptions.ValueError>` if the current
                   client is not an admin client or if it has not been
                   :meth:`start`-ed.
          """
          if self._instance_admin_client is None:
              if not self._admin:
                  raise ValueError("Client is not an admin client.")
              klass = _create_gapic_client(
                  bigtable_admin_v2.BigtableInstanceAdminClient,
                  client_options=self._admin_client_options,
              )
              self._instance_admin_client = klass(self)
          return self._instance_admin_client
  
      def instance(self, instance_id, display_name=None, instance_type=None, labels=None):
          """Factory to create a instance associated with this client.
  
          For example:
  
          .. literalinclude:: snippets.py
              :start-after: [START bigtable_create_prod_instance]
              :end-before: [END bigtable_create_prod_instance]
              :dedent: 4
  
          :type instance_id: str
          :param instance_id: The ID of the instance.
  
          :type display_name: str
          :param display_name: (Optional) The display name for the instance in
                               the Cloud Console UI. (Must be between 4 and 30
                               characters.) If this value is not set in the
                               constructor, will fall back to the instance ID.
  
          :type instance_type: int
          :param instance_type: (Optional) The type of the instance.
                                 Possible values are represented
                                 by the following constants:
                                 :data:`google.cloud.bigtable.enums.InstanceType.PRODUCTION`.
                                 :data:`google.cloud.bigtable.enums.InstanceType.DEVELOPMENT`,
                                 Defaults to
                                 :data:`google.cloud.bigtable.enums.InstanceType.UNSPECIFIED`.
  
          :type labels: dict
          :param labels: (Optional) Labels are a flexible and lightweight
                         mechanism for organizing cloud resources into groups
                         that reflect a customer's organizational needs and
                         deployment strategies. They can be used to filter
                         resources and aggregate metrics. Label keys must be
                         between 1 and 63 characters long. Maximum 64 labels can
                         be associated with a given resource. Label values must
                         be between 0 and 63 characters long. Keys and values
                         must both be under 128 bytes.
  
          :rtype: :class:`~google.cloud.bigtable.instance.Instance`
          :returns: an instance owned by this client.
          """
          return Instance(
              instance_id,
              self,
              display_name=display_name,
              instance_type=instance_type,
              labels=labels,
          )
  
      def list_instances(self):
          """List instances owned by the project.
  
          For example:
  
          .. literalinclude:: snippets.py
              :start-after: [START bigtable_list_instances]
              :end-before: [END bigtable_list_instances]
              :dedent: 4
  
          :rtype: tuple
          :returns:
              (instances, failed_locations), where 'instances' is list of
              :class:`google.cloud.bigtable.instance.Instance`, and
              'failed_locations' is a list of locations which could not
              be resolved.
          """
          resp = self.instance_admin_client.list_instances(self.project_path)
          instances = [Instance.from_pb(instance, self) for instance in resp.instances]
          return instances, resp.failed_locations
  
      def list_clusters(self):
          """List the clusters in the project.
  
          For example:
  
          .. literalinclude:: snippets.py
              :start-after: [START bigtable_list_clusters_in_project]
              :end-before: [END bigtable_list_clusters_in_project]
              :dedent: 4
  
          :rtype: tuple
          :returns:
              (clusters, failed_locations), where 'clusters' is list of
              :class:`google.cloud.bigtable.instance.Cluster`, and
              'failed_locations' is a list of strings representing
              locations which could not be resolved.
          """
          resp = self.instance_admin_client.list_clusters(
              self.instance_admin_client.instance_path(self.project, "-")
          )
          clusters = []
          instances = {}
          for cluster in resp.clusters:
              match_cluster_name = _CLUSTER_NAME_RE.match(cluster.name)
              instance_id = match_cluster_name.group("instance")
              if instance_id not in instances:
                  instances[instance_id] = self.instance(instance_id)
              clusters.append(Cluster.from_pb(cluster, instances[instance_id]))
          return clusters, resp.failed_locations
  