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Updated DB_Helper by adding firebase methods.

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Batuhan Berk Başoğlu 2020-10-05 16:53:40 -04:00
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# Copyright 2015 Google Inc. All rights reserved.
#
# 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.
"""User friendly container for Google Cloud Bigtable Instance."""
import re
from google.longrunning import operations_pb2
from gcloud._helpers import _pb_timestamp_to_datetime
from gcloud.bigtable._generated_v2 import (
instance_pb2 as data_v2_pb2)
from gcloud.bigtable._generated_v2 import (
bigtable_instance_admin_pb2 as messages_v2_pb2)
from gcloud.bigtable._generated_v2 import (
bigtable_table_admin_pb2 as table_messages_v2_pb2)
from gcloud.bigtable.cluster import Cluster
from gcloud.bigtable.cluster import DEFAULT_SERVE_NODES
from gcloud.bigtable.table import Table
_EXISTING_INSTANCE_LOCATION_ID = 'see-existing-cluster'
_INSTANCE_NAME_RE = re.compile(r'^projects/(?P<project>[^/]+)/'
r'instances/(?P<instance_id>[a-z][-a-z0-9]*)$')
_OPERATION_NAME_RE = re.compile(r'^operations/projects/([^/]+)/'
r'instances/([a-z][-a-z0-9]*)/'
r'locations/(?P<location_id>[a-z][-a-z0-9]*)/'
r'operations/(?P<operation_id>\d+)$')
_TYPE_URL_BASE = 'type.googleapis.com/google.bigtable.'
_ADMIN_TYPE_URL_BASE = _TYPE_URL_BASE + 'admin.v2.'
_INSTANCE_CREATE_METADATA = _ADMIN_TYPE_URL_BASE + 'CreateInstanceMetadata'
_TYPE_URL_MAP = {
_INSTANCE_CREATE_METADATA: messages_v2_pb2.CreateInstanceMetadata,
}
def _prepare_create_request(instance):
"""Creates a protobuf request for a CreateInstance request.
:type instance: :class:`Instance`
:param instance: The instance to be created.
:rtype: :class:`.messages_v2_pb2.CreateInstanceRequest`
:returns: The CreateInstance request object containing the instance info.
"""
parent_name = ('projects/' + instance._client.project)
message = messages_v2_pb2.CreateInstanceRequest(
parent=parent_name,
instance_id=instance.instance_id,
instance=data_v2_pb2.Instance(
display_name=instance.display_name,
),
)
cluster = message.clusters[instance.instance_id]
cluster.name = instance.name + '/clusters/' + instance.instance_id
cluster.location = (
parent_name + '/locations/' + instance._cluster_location_id)
cluster.serve_nodes = instance._cluster_serve_nodes
return message
def _parse_pb_any_to_native(any_val, expected_type=None):
"""Convert a serialized "google.protobuf.Any" value to actual type.
:type any_val: :class:`google.protobuf.any_pb2.Any`
:param any_val: A serialized protobuf value container.
:type expected_type: str
:param expected_type: (Optional) The type URL we expect ``any_val``
to have.
:rtype: object
:returns: The de-serialized object.
:raises: :class:`ValueError <exceptions.ValueError>` if the
``expected_type`` does not match the ``type_url`` on the input.
"""
if expected_type is not None and expected_type != any_val.type_url:
raise ValueError('Expected type: %s, Received: %s' % (
expected_type, any_val.type_url))
container_class = _TYPE_URL_MAP[any_val.type_url]
return container_class.FromString(any_val.value)
def _process_operation(operation_pb):
"""Processes a create protobuf response.
:type operation_pb: :class:`google.longrunning.operations_pb2.Operation`
:param operation_pb: The long-running operation response from a
Create/Update/Undelete instance request.
:rtype: (int, str, datetime)
:returns: (operation_id, location_id, operation_begin).
:raises: :class:`ValueError <exceptions.ValueError>` if the operation name
doesn't match the :data:`_OPERATION_NAME_RE` regex.
"""
match = _OPERATION_NAME_RE.match(operation_pb.name)
if match is None:
raise ValueError('Operation name was not in the expected '
'format after instance creation.',
operation_pb.name)
location_id = match.group('location_id')
operation_id = int(match.group('operation_id'))
request_metadata = _parse_pb_any_to_native(operation_pb.metadata)
operation_begin = _pb_timestamp_to_datetime(
request_metadata.request_time)
return operation_id, location_id, operation_begin
class Operation(object):
"""Representation of a Google API Long-Running Operation.
In particular, these will be the result of operations on
instances using the Cloud Bigtable API.
:type op_type: str
:param op_type: The type of operation being performed. Expect
``create``, ``update`` or ``undelete``.
:type op_id: int
:param op_id: The ID of the operation.
:type begin: :class:`datetime.datetime`
:param begin: The time when the operation was started.
:type location_id: str
:param location_id: ID of the location in which the operation is running
:type instance: :class:`Instance`
:param instance: The instance that created the operation.
"""
def __init__(self, op_type, op_id, begin, location_id, instance=None):
self.op_type = op_type
self.op_id = op_id
self.begin = begin
self.location_id = location_id
self._instance = instance
self._complete = False
def __eq__(self, other):
if not isinstance(other, self.__class__):
return False
return (other.op_type == self.op_type and
other.op_id == self.op_id and
other.begin == self.begin and
other.location_id == self.location_id and
other._instance == self._instance and
other._complete == self._complete)
def __ne__(self, other):
return not self.__eq__(other)
def finished(self):
"""Check if the operation has finished.
:rtype: bool
:returns: A boolean indicating if the current operation has completed.
:raises: :class:`ValueError <exceptions.ValueError>` if the operation
has already completed.
"""
if self._complete:
raise ValueError('The operation has completed.')
operation_name = (
'operations/%s/locations/%s/operations/%d' %
(self._instance.name, self.location_id, self.op_id))
request_pb = operations_pb2.GetOperationRequest(name=operation_name)
# We expect a `google.longrunning.operations_pb2.Operation`.
operation_pb = self._instance._client._operations_stub.GetOperation(
request_pb, self._instance._client.timeout_seconds)
if operation_pb.done:
self._complete = True
return True
else:
return False
class Instance(object):
"""Representation of a Google Cloud Bigtable Instance.
We can use a :class:`Instance` to:
* :meth:`reload` itself
* :meth:`create` itself
* :meth:`update` itself
* :meth:`delete` itself
* :meth:`undelete` itself
.. note::
For now, we leave out the ``default_storage_type`` (an enum)
which if not sent will end up as :data:`.data_v2_pb2.STORAGE_SSD`.
:type instance_id: str
:param instance_id: The ID of the instance.
:type client: :class:`Client <gcloud.bigtable.client.Client>`
:param client: The client that owns the instance. Provides
authorization and a project ID.
:type location_id: str
:param location_id: ID of the location in which the instance will be
created. Required for instances which do not yet
exist.
: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 serve_nodes: int
:param serve_nodes: (Optional) The number of nodes in the instance's
cluster; used to set up the instance's cluster.
"""
def __init__(self, instance_id, client,
location_id=_EXISTING_INSTANCE_LOCATION_ID,
display_name=None,
serve_nodes=DEFAULT_SERVE_NODES):
self.instance_id = instance_id
self.display_name = display_name or instance_id
self._cluster_location_id = location_id
self._cluster_serve_nodes = serve_nodes
self._client = client
def _update_from_pb(self, instance_pb):
"""Refresh self from the server-provided protobuf.
Helper for :meth:`from_pb` and :meth:`reload`.
"""
if not instance_pb.display_name: # Simple field (string)
raise ValueError('Instance protobuf does not contain display_name')
self.display_name = instance_pb.display_name
@classmethod
def from_pb(cls, instance_pb, client):
"""Creates a instance instance from a protobuf.
:type instance_pb: :class:`instance_pb2.Instance`
:param instance_pb: A instance protobuf object.
:type client: :class:`Client <gcloud.bigtable.client.Client>`
:param client: The client that owns the instance.
:rtype: :class:`Instance`
:returns: The instance parsed from the protobuf response.
:raises: :class:`ValueError <exceptions.ValueError>` if the instance
name does not match
``projects/{project}/instances/{instance_id}``
or if the parsed project ID does not match the project ID
on the client.
"""
match = _INSTANCE_NAME_RE.match(instance_pb.name)
if match is None:
raise ValueError('Instance protobuf name was not in the '
'expected format.', instance_pb.name)
if match.group('project') != client.project:
raise ValueError('Project ID on instance does not match the '
'project ID on the client')
instance_id = match.group('instance_id')
result = cls(instance_id, client, _EXISTING_INSTANCE_LOCATION_ID)
result._update_from_pb(instance_pb)
return result
def copy(self):
"""Make a copy of this instance.
Copies the local data stored as simple types and copies the client
attached to this instance.
:rtype: :class:`.Instance`
:returns: A copy of the current instance.
"""
new_client = self._client.copy()
return self.__class__(self.instance_id, new_client,
self._cluster_location_id,
display_name=self.display_name)
@property
def name(self):
"""Instance name used in requests.
.. note::
This property will not change if ``instance_id`` does not,
but the return value is not cached.
The instance name is of the form
``"projects/{project}/instances/{instance_id}"``
:rtype: str
:returns: The instance name.
"""
return self._client.project_name + '/instances/' + self.instance_id
def __eq__(self, other):
if not isinstance(other, self.__class__):
return False
# NOTE: This does not compare the configuration values, such as
# the display_name. Instead, it only compares
# identifying values instance ID and client. This is
# intentional, since the same instance can be in different states
# if not synchronized. Instances with similar instance
# settings but different clients can't be used in the same way.
return (other.instance_id == self.instance_id and
other._client == self._client)
def __ne__(self, other):
return not self.__eq__(other)
def reload(self):
"""Reload the metadata for this instance."""
request_pb = messages_v2_pb2.GetInstanceRequest(name=self.name)
# We expect `data_v2_pb2.Instance`.
instance_pb = self._client._instance_stub.GetInstance(
request_pb, self._client.timeout_seconds)
# NOTE: _update_from_pb does not check that the project and
# instance ID on the response match the request.
self._update_from_pb(instance_pb)
def create(self):
"""Create this instance.
.. note::
Uses the ``project`` and ``instance_id`` on the current
:class:`Instance` in addition to the ``display_name``.
To change them before creating, reset the values via
.. code:: python
instance.display_name = 'New display name'
instance.instance_id = 'i-changed-my-mind'
before calling :meth:`create`.
:rtype: :class:`Operation`
:returns: The long-running operation corresponding to the
create operation.
"""
request_pb = _prepare_create_request(self)
# We expect a `google.longrunning.operations_pb2.Operation`.
operation_pb = self._client._instance_stub.CreateInstance(
request_pb, self._client.timeout_seconds)
op_id, loc_id, op_begin = _process_operation(operation_pb)
return Operation('create', op_id, op_begin, loc_id, instance=self)
def update(self):
"""Update this instance.
.. note::
Updates the ``display_name``. To change that value before
updating, reset its values via
.. code:: python
instance.display_name = 'New display name'
before calling :meth:`update`.
"""
request_pb = data_v2_pb2.Instance(
name=self.name,
display_name=self.display_name,
)
# Ignore the expected `data_v2_pb2.Instance`.
self._client._instance_stub.UpdateInstance(
request_pb, self._client.timeout_seconds)
def delete(self):
"""Delete this instance.
Marks a instance and all of its tables for permanent deletion
in 7 days.
Immediately upon completion of the request:
* Billing will cease for all of the instance's reserved resources.
* The instance's ``delete_time`` field will be set 7 days in
the future.
Soon afterward:
* All tables within the instance will become unavailable.
Prior to the instance's ``delete_time``:
* The instance can be recovered with a call to ``UndeleteInstance``.
* All other attempts to modify or delete the instance will be rejected.
At the instance's ``delete_time``:
* The instance and **all of its tables** will immediately and
irrevocably disappear from the API, and their data will be
permanently deleted.
"""
request_pb = messages_v2_pb2.DeleteInstanceRequest(name=self.name)
# We expect a `google.protobuf.empty_pb2.Empty`
self._client._instance_stub.DeleteInstance(
request_pb, self._client.timeout_seconds)
def cluster(self, cluster_id, serve_nodes=3):
"""Factory to create a cluster associated with this client.
:type cluster_id: str
:param cluster_id: The ID of the cluster.
:type serve_nodes: int
:param serve_nodes: (Optional) The number of nodes in the cluster.
Defaults to 3.
:rtype: :class:`.Cluster`
:returns: The cluster owned by this client.
"""
return Cluster(cluster_id, self, serve_nodes=serve_nodes)
def list_clusters(self):
"""Lists clusters in this instance.
:rtype: tuple
:returns: A pair of results, the first is a list of :class:`.Cluster` s
returned and the second is a list of strings (the failed
locations in the request).
"""
request_pb = messages_v2_pb2.ListClustersRequest(parent=self.name)
# We expect a `.cluster_messages_v1_pb2.ListClustersResponse`
list_clusters_response = self._client._instance_stub.ListClusters(
request_pb, self._client.timeout_seconds)
failed_locations = [
location for location in list_clusters_response.failed_locations]
clusters = [Cluster.from_pb(cluster_pb, self)
for cluster_pb in list_clusters_response.clusters]
return clusters, failed_locations
def table(self, table_id):
"""Factory to create a table associated with this instance.
:type table_id: str
:param table_id: The ID of the table.
:rtype: :class:`Table <gcloud.bigtable.table.Table>`
:returns: The table owned by this instance.
"""
return Table(table_id, self)
def list_tables(self):
"""List the tables in this instance.
:rtype: list of :class:`Table <gcloud.bigtable.table.Table>`
:returns: The list of tables owned by the instance.
:raises: :class:`ValueError <exceptions.ValueError>` if one of the
returned tables has a name that is not of the expected format.
"""
request_pb = table_messages_v2_pb2.ListTablesRequest(parent=self.name)
# We expect a `table_messages_v2_pb2.ListTablesResponse`
table_list_pb = self._client._table_stub.ListTables(
request_pb, self._client.timeout_seconds)
result = []
for table_pb in table_list_pb.tables:
table_prefix = self.name + '/tables/'
if not table_pb.name.startswith(table_prefix):
raise ValueError('Table name %s not of expected format' % (
table_pb.name,))
table_id = table_pb.name[len(table_prefix):]
result.append(self.table(table_id))
return result