542 lines
19 KiB
Python
542 lines
19 KiB
Python
# Copyright 2017 Google LLC 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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"""Client for interacting with the Google Cloud Firestore API.
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This is the base from which all interactions with the API occur.
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In the hierarchy of API concepts
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* a :class:`~google.cloud.firestore_v1beta1.client.Client` owns a
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:class:`~google.cloud.firestore_v1beta1.collection.CollectionReference`
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* a :class:`~google.cloud.firestore_v1beta1.client.Client` owns a
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:class:`~google.cloud.firestore_v1beta1.document.DocumentReference`
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"""
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import warnings
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from google.cloud.client import ClientWithProject
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from google.cloud.firestore_v1beta1 import _helpers
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from google.cloud.firestore_v1beta1 import types
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from google.cloud.firestore_v1beta1.batch import WriteBatch
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from google.cloud.firestore_v1beta1.collection import CollectionReference
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from google.cloud.firestore_v1beta1.document import DocumentReference
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from google.cloud.firestore_v1beta1.document import DocumentSnapshot
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from google.cloud.firestore_v1beta1.field_path import render_field_path
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from google.cloud.firestore_v1beta1.gapic import firestore_client
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from google.cloud.firestore_v1beta1.gapic.transports import firestore_grpc_transport
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from google.cloud.firestore_v1beta1.transaction import Transaction
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DEFAULT_DATABASE = "(default)"
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"""str: The default database used in a :class:`~google.cloud.firestore.client.Client`."""
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_BAD_OPTION_ERR = (
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"Exactly one of ``last_update_time`` or ``exists`` " "must be provided."
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)
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_BAD_DOC_TEMPLATE = (
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"Document {!r} appeared in response but was not present among references"
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)
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_ACTIVE_TXN = "There is already an active transaction."
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_INACTIVE_TXN = "There is no active transaction."
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_V1BETA1_DEPRECATED_MESSAGE = (
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"The 'v1beta1' API endpoint is deprecated. "
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"The client/library which supports it will be removed in a future release."
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)
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class Client(ClientWithProject):
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"""Client for interacting with Google Cloud Firestore API.
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.. note::
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Since the Cloud Firestore API requires the gRPC transport, no
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``_http`` argument is accepted by this class.
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Args:
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project (Optional[str]): The project which the client acts on behalf
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of. If not passed, falls back to the default inferred
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from the environment.
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credentials (Optional[~google.auth.credentials.Credentials]): The
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OAuth2 Credentials to use for this client. If not passed, falls
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back to the default inferred from the environment.
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database (Optional[str]): The database name that the client targets.
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For now, :attr:`DEFAULT_DATABASE` (the default value) is the
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only valid database.
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"""
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SCOPE = (
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"https://www.googleapis.com/auth/cloud-platform",
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"https://www.googleapis.com/auth/datastore",
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)
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"""The scopes required for authenticating with the Firestore service."""
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_firestore_api_internal = None
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_database_string_internal = None
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_rpc_metadata_internal = None
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def __init__(self, project=None, credentials=None, database=DEFAULT_DATABASE):
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warnings.warn(_V1BETA1_DEPRECATED_MESSAGE, DeprecationWarning, stacklevel=2)
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# NOTE: This API has no use for the _http argument, but sending it
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# will have no impact since the _http() @property only lazily
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# creates a working HTTP object.
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super(Client, self).__init__(
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project=project, credentials=credentials, _http=None
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)
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self._database = database
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@property
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def _firestore_api(self):
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"""Lazy-loading getter GAPIC Firestore API.
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Returns:
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~.gapic.firestore.v1beta1.firestore_client.FirestoreClient: The
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GAPIC client with the credentials of the current client.
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"""
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if self._firestore_api_internal is None:
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# Use a custom channel.
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# We need this in order to set appropriate keepalive options.
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channel = firestore_grpc_transport.FirestoreGrpcTransport.create_channel(
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self._target,
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credentials=self._credentials,
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options={"grpc.keepalive_time_ms": 30000}.items(),
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)
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self._transport = firestore_grpc_transport.FirestoreGrpcTransport(
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address=self._target, channel=channel
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)
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self._firestore_api_internal = firestore_client.FirestoreClient(
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transport=self._transport
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)
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return self._firestore_api_internal
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@property
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def _target(self):
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"""Return the target (where the API is).
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Returns:
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str: The location of the API.
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"""
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return firestore_client.FirestoreClient.SERVICE_ADDRESS
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@property
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def _database_string(self):
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"""The database string corresponding to this client's project.
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This value is lazy-loaded and cached.
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Will be of the form
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``projects/{project_id}/databases/{database_id}``
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but ``database_id == '(default)'`` for the time being.
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Returns:
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str: The fully-qualified database string for the current
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project. (The default database is also in this string.)
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"""
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if self._database_string_internal is None:
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# NOTE: database_root_path() is a classmethod, so we don't use
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# self._firestore_api (it isn't necessary).
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db_str = firestore_client.FirestoreClient.database_root_path(
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self.project, self._database
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)
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self._database_string_internal = db_str
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return self._database_string_internal
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@property
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def _rpc_metadata(self):
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"""The RPC metadata for this client's associated database.
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Returns:
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Sequence[Tuple(str, str)]: RPC metadata with resource prefix
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for the database associated with this client.
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"""
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if self._rpc_metadata_internal is None:
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self._rpc_metadata_internal = _helpers.metadata_with_prefix(
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self._database_string
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)
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return self._rpc_metadata_internal
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def collection(self, *collection_path):
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"""Get a reference to a collection.
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For a top-level collection:
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.. code-block:: python
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>>> client.collection('top')
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For a sub-collection:
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.. code-block:: python
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>>> client.collection('mydocs/doc/subcol')
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>>> # is the same as
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>>> client.collection('mydocs', 'doc', 'subcol')
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Sub-collections can be nested deeper in a similar fashion.
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Args:
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collection_path (Tuple[str, ...]): Can either be
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* A single ``/``-delimited path to a collection
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* A tuple of collection path segments
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Returns:
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~.firestore_v1beta1.collection.CollectionReference: A reference
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to a collection in the Firestore database.
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"""
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if len(collection_path) == 1:
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path = collection_path[0].split(_helpers.DOCUMENT_PATH_DELIMITER)
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else:
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path = collection_path
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return CollectionReference(*path, client=self)
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def document(self, *document_path):
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"""Get a reference to a document in a collection.
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For a top-level document:
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.. code-block:: python
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>>> client.document('collek/shun')
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>>> # is the same as
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>>> client.document('collek', 'shun')
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For a document in a sub-collection:
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.. code-block:: python
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>>> client.document('mydocs/doc/subcol/child')
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>>> # is the same as
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>>> client.document('mydocs', 'doc', 'subcol', 'child')
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Documents in sub-collections can be nested deeper in a similar fashion.
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Args:
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document_path (Tuple[str, ...]): Can either be
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* A single ``/``-delimited path to a document
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* A tuple of document path segments
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Returns:
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~.firestore_v1beta1.document.DocumentReference: A reference
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to a document in a collection.
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"""
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if len(document_path) == 1:
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path = document_path[0].split(_helpers.DOCUMENT_PATH_DELIMITER)
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else:
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path = document_path
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return DocumentReference(*path, client=self)
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@staticmethod
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def field_path(*field_names):
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"""Create a **field path** from a list of nested field names.
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A **field path** is a ``.``-delimited concatenation of the field
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names. It is used to represent a nested field. For example,
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in the data
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.. code-block:: python
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data = {
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'aa': {
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'bb': {
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'cc': 10,
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},
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},
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}
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the field path ``'aa.bb.cc'`` represents the data stored in
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``data['aa']['bb']['cc']``.
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Args:
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field_names (Tuple[str, ...]): The list of field names.
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Returns:
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str: The ``.``-delimited field path.
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"""
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return render_field_path(field_names)
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@staticmethod
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def write_option(**kwargs):
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"""Create a write option for write operations.
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Write operations include :meth:`~google.cloud.DocumentReference.set`,
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:meth:`~google.cloud.DocumentReference.update` and
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:meth:`~google.cloud.DocumentReference.delete`.
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One of the following keyword arguments must be provided:
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* ``last_update_time`` (:class:`google.protobuf.timestamp_pb2.\
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Timestamp`): A timestamp. When set, the target document must
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exist and have been last updated at that time. Protobuf
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``update_time`` timestamps are typically returned from methods
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that perform write operations as part of a "write result"
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protobuf or directly.
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* ``exists`` (:class:`bool`): Indicates if the document being modified
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should already exist.
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Providing no argument would make the option have no effect (so
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it is not allowed). Providing multiple would be an apparent
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contradiction, since ``last_update_time`` assumes that the
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document **was** updated (it can't have been updated if it
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doesn't exist) and ``exists`` indicate that it is unknown if the
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document exists or not.
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Args:
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kwargs (Dict[str, Any]): The keyword arguments described above.
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Raises:
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TypeError: If anything other than exactly one argument is
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provided by the caller.
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"""
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if len(kwargs) != 1:
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raise TypeError(_BAD_OPTION_ERR)
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name, value = kwargs.popitem()
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if name == "last_update_time":
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return _helpers.LastUpdateOption(value)
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elif name == "exists":
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return _helpers.ExistsOption(value)
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else:
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extra = "{!r} was provided".format(name)
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raise TypeError(_BAD_OPTION_ERR, extra)
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def get_all(self, references, field_paths=None, transaction=None):
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"""Retrieve a batch of documents.
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.. note::
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Documents returned by this method are not guaranteed to be
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returned in the same order that they are given in ``references``.
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.. note::
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If multiple ``references`` refer to the same document, the server
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will only return one result.
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See :meth:`~google.cloud.firestore_v1beta1.client.Client.field_path`
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for more information on **field paths**.
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If a ``transaction`` is used and it already has write operations
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added, this method cannot be used (i.e. read-after-write is not
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allowed).
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Args:
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references (List[.DocumentReference, ...]): Iterable of document
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references to be retrieved.
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field_paths (Optional[Iterable[str, ...]]): An iterable of field
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paths (``.``-delimited list of field names) to use as a
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projection of document fields in the returned results. If
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no value is provided, all fields will be returned.
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transaction (Optional[~.firestore_v1beta1.transaction.\
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Transaction]): An existing transaction that these
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``references`` will be retrieved in.
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Yields:
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.DocumentSnapshot: The next document snapshot that fulfills the
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query, or :data:`None` if the document does not exist.
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"""
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document_paths, reference_map = _reference_info(references)
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mask = _get_doc_mask(field_paths)
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response_iterator = self._firestore_api.batch_get_documents(
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self._database_string,
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document_paths,
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mask,
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transaction=_helpers.get_transaction_id(transaction),
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metadata=self._rpc_metadata,
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)
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for get_doc_response in response_iterator:
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yield _parse_batch_get(get_doc_response, reference_map, self)
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def collections(self):
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"""List top-level collections of the client's database.
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Returns:
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Sequence[~.firestore_v1beta1.collection.CollectionReference]:
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iterator of subcollections of the current document.
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"""
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iterator = self._firestore_api.list_collection_ids(
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self._database_string, metadata=self._rpc_metadata
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)
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iterator.client = self
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iterator.item_to_value = _item_to_collection_ref
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return iterator
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def batch(self):
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"""Get a batch instance from this client.
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Returns:
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~.firestore_v1beta1.batch.WriteBatch: A "write" batch to be
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used for accumulating document changes and sending the changes
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all at once.
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"""
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return WriteBatch(self)
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def transaction(self, **kwargs):
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"""Get a transaction that uses this client.
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See :class:`~google.cloud.firestore_v1beta1.transaction.Transaction`
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for more information on transactions and the constructor arguments.
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Args:
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kwargs (Dict[str, Any]): The keyword arguments (other than
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``client``) to pass along to the
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:class:`~google.cloud.firestore_v1beta1.transaction.Transaction`
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constructor.
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Returns:
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~.firestore_v1beta1.transaction.Transaction: A transaction
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attached to this client.
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"""
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return Transaction(self, **kwargs)
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def _reference_info(references):
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"""Get information about document references.
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Helper for :meth:`~google.cloud.firestore_v1beta1.client.Client.get_all`.
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Args:
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references (List[.DocumentReference, ...]): Iterable of document
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references.
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Returns:
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Tuple[List[str, ...], Dict[str, .DocumentReference]]: A two-tuple of
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* fully-qualified documents paths for each reference in ``references``
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* a mapping from the paths to the original reference. (If multiple
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``references`` contains multiple references to the same document,
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that key will be overwritten in the result.)
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"""
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document_paths = []
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reference_map = {}
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for reference in references:
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doc_path = reference._document_path
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document_paths.append(doc_path)
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reference_map[doc_path] = reference
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return document_paths, reference_map
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def _get_reference(document_path, reference_map):
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"""Get a document reference from a dictionary.
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This just wraps a simple dictionary look-up with a helpful error that is
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specific to :meth:`~google.cloud.firestore.client.Client.get_all`, the
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**public** caller of this function.
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Args:
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document_path (str): A fully-qualified document path.
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reference_map (Dict[str, .DocumentReference]): A mapping (produced
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by :func:`_reference_info`) of fully-qualified document paths to
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document references.
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Returns:
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.DocumentReference: The matching reference.
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Raises:
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ValueError: If ``document_path`` has not been encountered.
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"""
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try:
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return reference_map[document_path]
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except KeyError:
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msg = _BAD_DOC_TEMPLATE.format(document_path)
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raise ValueError(msg)
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def _parse_batch_get(get_doc_response, reference_map, client):
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"""Parse a `BatchGetDocumentsResponse` protobuf.
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Args:
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get_doc_response (~google.cloud.proto.firestore.v1beta1.\
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firestore_pb2.BatchGetDocumentsResponse): A single response (from
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a stream) containing the "get" response for a document.
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reference_map (Dict[str, .DocumentReference]): A mapping (produced
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by :func:`_reference_info`) of fully-qualified document paths to
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document references.
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client (~.firestore_v1beta1.client.Client): A client that has
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a document factory.
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Returns:
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[.DocumentSnapshot]: The retrieved snapshot.
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Raises:
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ValueError: If the response has a ``result`` field (a oneof) other
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than ``found`` or ``missing``.
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"""
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result_type = get_doc_response.WhichOneof("result")
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if result_type == "found":
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reference = _get_reference(get_doc_response.found.name, reference_map)
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data = _helpers.decode_dict(get_doc_response.found.fields, client)
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snapshot = DocumentSnapshot(
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reference,
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data,
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exists=True,
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read_time=get_doc_response.read_time,
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create_time=get_doc_response.found.create_time,
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update_time=get_doc_response.found.update_time,
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)
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elif result_type == "missing":
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snapshot = DocumentSnapshot(
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None,
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None,
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exists=False,
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read_time=get_doc_response.read_time,
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create_time=None,
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update_time=None,
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)
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else:
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raise ValueError(
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"`BatchGetDocumentsResponse.result` (a oneof) had a field other "
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"than `found` or `missing` set, or was unset"
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)
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return snapshot
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def _get_doc_mask(field_paths):
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"""Get a document mask if field paths are provided.
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Args:
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field_paths (Optional[Iterable[str, ...]]): An iterable of field
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paths (``.``-delimited list of field names) to use as a
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projection of document fields in the returned results.
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Returns:
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Optional[google.cloud.firestore_v1beta1.types.DocumentMask]: A mask
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to project documents to a restricted set of field paths.
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"""
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if field_paths is None:
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return None
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else:
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return types.DocumentMask(field_paths=field_paths)
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def _item_to_collection_ref(iterator, item):
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"""Convert collection ID to collection ref.
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Args:
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iterator (google.api_core.page_iterator.GRPCIterator):
|
|
iterator response
|
|
item (str): ID of the collection
|
|
"""
|
|
return iterator.client.collection(item)
|