385 lines
14 KiB
Python
385 lines
14 KiB
Python
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# Copyright 2015 Google Inc. All rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""User friendly container for Google Cloud Bigtable Cluster."""
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import re
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from google.longrunning import operations_pb2
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from gcloud.bigtable._generated_v2 import (
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instance_pb2 as data_v2_pb2)
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from gcloud.bigtable._generated_v2 import (
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bigtable_instance_admin_pb2 as messages_v2_pb2)
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_CLUSTER_NAME_RE = re.compile(r'^projects/(?P<project>[^/]+)/'
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r'instances/(?P<instance>[^/]+)/clusters/'
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r'(?P<cluster_id>[a-z][-a-z0-9]*)$')
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_OPERATION_NAME_RE = re.compile(r'^operations/'
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r'projects/([^/]+)/'
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r'instances/([^/]+)/'
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r'clusters/([a-z][-a-z0-9]*)/'
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r'operations/(?P<operation_id>\d+)$')
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_TYPE_URL_MAP = {
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}
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DEFAULT_SERVE_NODES = 3
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"""Default number of nodes to use when creating a cluster."""
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def _prepare_create_request(cluster):
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"""Creates a protobuf request for a CreateCluster request.
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:type cluster: :class:`Cluster`
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:param cluster: The cluster to be created.
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:rtype: :class:`.messages_v2_pb2.CreateClusterRequest`
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:returns: The CreateCluster request object containing the cluster info.
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"""
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return messages_v2_pb2.CreateClusterRequest(
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parent=cluster._instance.name,
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cluster_id=cluster.cluster_id,
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cluster=data_v2_pb2.Cluster(
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serve_nodes=cluster.serve_nodes,
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),
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)
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def _parse_pb_any_to_native(any_val, expected_type=None):
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"""Convert a serialized "google.protobuf.Any" value to actual type.
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:type any_val: :class:`google.protobuf.any_pb2.Any`
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:param any_val: A serialized protobuf value container.
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:type expected_type: str
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:param expected_type: (Optional) The type URL we expect ``any_val``
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to have.
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:rtype: object
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:returns: The de-serialized object.
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:raises: :class:`ValueError <exceptions.ValueError>` if the
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``expected_type`` does not match the ``type_url`` on the input.
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"""
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if expected_type is not None and expected_type != any_val.type_url:
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raise ValueError('Expected type: %s, Received: %s' % (
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expected_type, any_val.type_url))
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container_class = _TYPE_URL_MAP[any_val.type_url]
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return container_class.FromString(any_val.value)
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def _process_operation(operation_pb):
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"""Processes a create protobuf response.
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:type operation_pb: :class:`google.longrunning.operations_pb2.Operation`
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:param operation_pb: The long-running operation response from a
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Create/Update/Undelete cluster request.
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:rtype: tuple
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:returns: integer ID of the operation (``operation_id``).
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:raises: :class:`ValueError <exceptions.ValueError>` if the operation name
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doesn't match the :data:`_OPERATION_NAME_RE` regex.
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"""
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match = _OPERATION_NAME_RE.match(operation_pb.name)
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if match is None:
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raise ValueError('Operation name was not in the expected '
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'format after a cluster modification.',
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operation_pb.name)
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operation_id = int(match.group('operation_id'))
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return operation_id
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class Operation(object):
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"""Representation of a Google API Long-Running Operation.
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In particular, these will be the result of operations on
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clusters using the Cloud Bigtable API.
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:type op_type: str
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:param op_type: The type of operation being performed. Expect
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``create``, ``update`` or ``undelete``.
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:type op_id: int
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:param op_id: The ID of the operation.
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:type cluster: :class:`Cluster`
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:param cluster: The cluster that created the operation.
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"""
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def __init__(self, op_type, op_id, cluster=None):
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self.op_type = op_type
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self.op_id = op_id
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self._cluster = cluster
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self._complete = False
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def __eq__(self, other):
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if not isinstance(other, self.__class__):
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return False
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return (other.op_type == self.op_type and
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other.op_id == self.op_id and
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other._cluster == self._cluster and
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other._complete == self._complete)
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def __ne__(self, other):
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return not self.__eq__(other)
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def finished(self):
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"""Check if the operation has finished.
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:rtype: bool
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:returns: A boolean indicating if the current operation has completed.
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:raises: :class:`ValueError <exceptions.ValueError>` if the operation
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has already completed.
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"""
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if self._complete:
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raise ValueError('The operation has completed.')
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operation_name = ('operations/' + self._cluster.name +
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'/operations/%d' % (self.op_id,))
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request_pb = operations_pb2.GetOperationRequest(name=operation_name)
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# We expect a `google.longrunning.operations_pb2.Operation`.
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client = self._cluster._instance._client
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operation_pb = client._operations_stub.GetOperation(
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request_pb, client.timeout_seconds)
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if operation_pb.done:
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self._complete = True
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return True
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else:
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return False
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class Cluster(object):
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"""Representation of a Google Cloud Bigtable Cluster.
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We can use a :class:`Cluster` to:
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* :meth:`reload` itself
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* :meth:`create` itself
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* :meth:`update` itself
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* :meth:`delete` itself
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* :meth:`undelete` itself
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.. note::
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For now, we leave out the ``default_storage_type`` (an enum)
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which if not sent will end up as :data:`.data_v2_pb2.STORAGE_SSD`.
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:type cluster_id: str
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:param cluster_id: The ID of the cluster.
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:type instance: :class:`.instance.Instance`
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:param instance: The instance where the cluster resides.
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:type serve_nodes: int
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:param serve_nodes: (Optional) The number of nodes in the cluster.
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Defaults to :data:`DEFAULT_SERVE_NODES`.
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"""
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def __init__(self, cluster_id, instance,
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serve_nodes=DEFAULT_SERVE_NODES):
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self.cluster_id = cluster_id
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self._instance = instance
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self.serve_nodes = serve_nodes
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self.location = None
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def _update_from_pb(self, cluster_pb):
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"""Refresh self from the server-provided protobuf.
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Helper for :meth:`from_pb` and :meth:`reload`.
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"""
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if not cluster_pb.serve_nodes: # Simple field (int32)
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raise ValueError('Cluster protobuf does not contain serve_nodes')
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self.serve_nodes = cluster_pb.serve_nodes
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self.location = cluster_pb.location
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@classmethod
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def from_pb(cls, cluster_pb, instance):
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"""Creates a cluster instance from a protobuf.
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:type cluster_pb: :class:`instance_pb2.Cluster`
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:param cluster_pb: A cluster protobuf object.
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:type instance: :class:`.instance.Instance>`
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:param instance: The instance that owns the cluster.
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:rtype: :class:`Cluster`
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:returns: The cluster parsed from the protobuf response.
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:raises:
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:class:`ValueError <exceptions.ValueError>` if the cluster
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name does not match
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``projects/{project}/instances/{instance}/clusters/{cluster_id}``
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or if the parsed project ID does not match the project ID
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on the client.
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"""
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match = _CLUSTER_NAME_RE.match(cluster_pb.name)
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if match is None:
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raise ValueError('Cluster protobuf name was not in the '
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'expected format.', cluster_pb.name)
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if match.group('project') != instance._client.project:
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raise ValueError('Project ID on cluster does not match the '
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'project ID on the client')
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if match.group('instance') != instance.instance_id:
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raise ValueError('Instance ID on cluster does not match the '
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'instance ID on the client')
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result = cls(match.group('cluster_id'), instance)
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result._update_from_pb(cluster_pb)
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return result
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def copy(self):
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"""Make a copy of this cluster.
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Copies the local data stored as simple types and copies the client
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attached to this instance.
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:rtype: :class:`.Cluster`
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:returns: A copy of the current cluster.
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"""
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new_instance = self._instance.copy()
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return self.__class__(self.cluster_id, new_instance,
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serve_nodes=self.serve_nodes)
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@property
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def name(self):
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"""Cluster name used in requests.
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.. note::
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This property will not change if ``_instance`` and ``cluster_id``
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do not, but the return value is not cached.
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The cluster name is of the form
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``"projects/{project}/instances/{instance}/clusters/{cluster_id}"``
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:rtype: str
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:returns: The cluster name.
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"""
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return self._instance.name + '/clusters/' + self.cluster_id
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def __eq__(self, other):
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if not isinstance(other, self.__class__):
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return False
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# NOTE: This does not compare the configuration values, such as
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# the serve_nodes. Instead, it only compares
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# identifying values instance, cluster ID and client. This is
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# intentional, since the same cluster can be in different states
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# if not synchronized. Clusters with similar instance/cluster
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# settings but different clients can't be used in the same way.
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return (other.cluster_id == self.cluster_id and
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other._instance == self._instance)
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def __ne__(self, other):
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return not self.__eq__(other)
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def reload(self):
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"""Reload the metadata for this cluster."""
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request_pb = messages_v2_pb2.GetClusterRequest(name=self.name)
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# We expect a `._generated_v2.instance_pb2.Cluster`.
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cluster_pb = self._instance._client._instance_stub.GetCluster(
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request_pb, self._instance._client.timeout_seconds)
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# NOTE: _update_from_pb does not check that the project, instance and
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# cluster ID on the response match the request.
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self._update_from_pb(cluster_pb)
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def create(self):
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"""Create this cluster.
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.. note::
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Uses the ``project``, ``instance`` and ``cluster_id`` on the
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current :class:`Cluster` in addition to the ``serve_nodes``.
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To change them before creating, reset the values via
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.. code:: python
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cluster.serve_nodes = 8
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cluster.cluster_id = 'i-changed-my-mind'
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before calling :meth:`create`.
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:rtype: :class:`Operation`
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:returns: The long-running operation corresponding to the
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create operation.
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"""
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request_pb = _prepare_create_request(self)
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# We expect a `google.longrunning.operations_pb2.Operation`.
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operation_pb = self._instance._client._instance_stub.CreateCluster(
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request_pb, self._instance._client.timeout_seconds)
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op_id = _process_operation(operation_pb)
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return Operation('create', op_id, cluster=self)
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def update(self):
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"""Update this cluster.
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.. note::
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Updates the ``serve_nodes``. If you'd like to
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change them before updating, reset the values via
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.. code:: python
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cluster.serve_nodes = 8
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before calling :meth:`update`.
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:rtype: :class:`Operation`
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:returns: The long-running operation corresponding to the
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update operation.
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"""
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request_pb = data_v2_pb2.Cluster(
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name=self.name,
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serve_nodes=self.serve_nodes,
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)
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# Ignore expected `._generated_v2.instance_pb2.Cluster`.
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operation_pb = self._instance._client._instance_stub.UpdateCluster(
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request_pb, self._instance._client.timeout_seconds)
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op_id = _process_operation(operation_pb)
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return Operation('update', op_id, cluster=self)
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def delete(self):
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"""Delete this cluster.
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Marks a cluster and all of its tables for permanent deletion in 7 days.
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Immediately upon completion of the request:
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* Billing will cease for all of the cluster's reserved resources.
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* The cluster's ``delete_time`` field will be set 7 days in the future.
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Soon afterward:
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* All tables within the cluster will become unavailable.
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Prior to the cluster's ``delete_time``:
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* The cluster can be recovered with a call to ``UndeleteCluster``.
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* All other attempts to modify or delete the cluster will be rejected.
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At the cluster's ``delete_time``:
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* The cluster and **all of its tables** will immediately and
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irrevocably disappear from the API, and their data will be
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permanently deleted.
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"""
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request_pb = messages_v2_pb2.DeleteClusterRequest(name=self.name)
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# We expect a `google.protobuf.empty_pb2.Empty`
|
||
|
|
self._instance._client._instance_stub.DeleteCluster(
|
||
|
|
request_pb, self._instance._client.timeout_seconds)
|