googleapis
diff --git a/‎google/cloud/firestore_v1/async_batch.py
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diff --git a/‎google/cloud/firestore_v1/async_client.py
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+# Copyright 2020 Google LLC 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.
+
+"""Helpers for batch requests to the Google Cloud Firestore API."""
+
+
+from google.cloud.firestore_v1.base_batch import BaseWriteBatch
+
+
+class AsyncWriteBatch(BaseWriteBatch):
+    """Accumulate write operations to be sent in a batch.
+
+    This has the same set of methods for write operations that
+    :class:`~google.cloud.firestore_v1.async_document.AsyncDocumentReference` does,
+    e.g. :meth:`~google.cloud.firestore_v1.async_document.AsyncDocumentReference.create`.
+
+    Args:
+        client (:class:`~google.cloud.firestore_v1.async_client.AsyncClient`):
+            The client that created this batch.
+    """
+
+    def __init__(self, client):
+        super(AsyncWriteBatch, self).__init__(client=client)
+
+    async def commit(self):
+        """Commit the changes accumulated in this batch.
+
+        Returns:
+            List[:class:`google.cloud.proto.firestore.v1.write.WriteResult`, ...]:
+            The write results corresponding to the changes committed, returned
+            in the same order as the changes were applied to this batch. A
+            write result contains an ``update_time`` field.
+        """
+        commit_response = self._client._firestore_api.commit(
+            request={
+                "database": self._client._database_string,
+                "writes": self._write_pbs,
+                "transaction": None,
+            },
+            metadata=self._client._rpc_metadata,
+        )
+
+        self._write_pbs = []
+        self.write_results = results = list(commit_response.write_results)
+        self.commit_time = commit_response.commit_time
+        return results
+
+    async def __aenter__(self):
+        return self
+
+    async def __aexit__(self, exc_type, exc_value, traceback):
+        if exc_type is None:
+            await self.commit()
@@ -0,0 +1,288 @@
+# Copyright 2020 Google LLC 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.
+
+"""Client for interacting with the Google Cloud Firestore API.
+
+This is the base from which all interactions with the API occur.
+
+In the hierarchy of API concepts
+
+* a :class:`~google.cloud.firestore_v1.client.Client` owns a
+  :class:`~google.cloud.firestore_v1.async_collection.AsyncCollectionReference`
+* a :class:`~google.cloud.firestore_v1.client.Client` owns a
+  :class:`~google.cloud.firestore_v1.async_document.AsyncDocumentReference`
+"""
+
+from google.cloud.firestore_v1.base_client import (
+    BaseClient,
+    DEFAULT_DATABASE,
+    _CLIENT_INFO,
+    _reference_info,
+    _parse_batch_get,
+    _get_doc_mask,
+    _path_helper,
+)
+
+from google.cloud.firestore_v1 import _helpers
+from google.cloud.firestore_v1.async_query import AsyncQuery
+from google.cloud.firestore_v1.async_batch import AsyncWriteBatch
+from google.cloud.firestore_v1.async_collection import AsyncCollectionReference
+from google.cloud.firestore_v1.async_document import AsyncDocumentReference
+from google.cloud.firestore_v1.async_transaction import AsyncTransaction
+
+
+class AsyncClient(BaseClient):
+    """Client for interacting with Google Cloud Firestore API.
+
+    .. note::
+
+        Since the Cloud Firestore API requires the gRPC transport, no
+        ``_http`` argument is accepted by this class.
+
+    Args:
+        project (Optional[str]): The project which the client acts on behalf
+            of. If not passed, falls back to the default inferred
+            from the environment.
+        credentials (Optional[~google.auth.credentials.Credentials]): The
+            OAuth2 Credentials to use for this client. If not passed, falls
+            back to the default inferred from the environment.
+        database (Optional[str]): The database name that the client targets.
+            For now, :attr:`DEFAULT_DATABASE` (the default value) is the
+            only valid database.
+        client_info (Optional[google.api_core.gapic_v1.client_info.ClientInfo]):
+            The client info used to send a user-agent string along with API
+            requests. If ``None``, then default info will be used. Generally,
+            you only need to set this if you're developing your own library
+            or partner tool.
+        client_options (Union[dict, google.api_core.client_options.ClientOptions]):
+            Client options used to set user options on the client. API Endpoint
+            should be set through client_options.
+    """
+
+    def __init__(
+        self,
+        project=None,
+        credentials=None,
+        database=DEFAULT_DATABASE,
+        client_info=_CLIENT_INFO,
+        client_options=None,
+    ):
+        super(AsyncClient, self).__init__(
+            project=project,
+            credentials=credentials,
+            database=database,
+            client_info=client_info,
+            client_options=client_options,
+        )
+
+    def collection(self, *collection_path):
+        """Get a reference to a collection.
+
+        For a top-level collection:
+
+        .. code-block:: python
+
+            >>> client.collection('top')
+
+        For a sub-collection:
+
+        .. code-block:: python
+
+            >>> client.collection('mydocs/doc/subcol')
+            >>> # is the same as
+            >>> client.collection('mydocs', 'doc', 'subcol')
+
+        Sub-collections can be nested deeper in a similar fashion.
+
+        Args:
+            collection_path (Tuple[str, ...]): Can either be
+
+                * A single ``/``-delimited path to a collection
+                * A tuple of collection path segments
+
+        Returns:
+            :class:`~google.cloud.firestore_v1.async_collection.AsyncCollectionReference`:
+            A reference to a collection in the Firestore database.
+        """
+        return AsyncCollectionReference(*_path_helper(collection_path), client=self)
+
+    def collection_group(self, collection_id):
+        """
+        Creates and returns a new AsyncQuery that includes all documents in the
+        database that are contained in a collection or subcollection with the
+        given collection_id.
+
+        .. code-block:: python
+
+            >>> query = client.collection_group('mygroup')
+
+        Args:
+            collection_id (str) Identifies the collections to query over.
+
+                Every collection or subcollection with this ID as the last segment of its
+                path will be included. Cannot contain a slash.
+
+        Returns:
+            :class:`~google.cloud.firestore_v1.async_query.AsyncQuery`:
+            The created AsyncQuery.
+        """
+        return AsyncQuery(
+            self._get_collection_reference(collection_id), all_descendants=True
+        )
+
+    def document(self, *document_path):
+        """Get a reference to a document in a collection.
+
+        For a top-level document:
+
+        .. code-block:: python
+
+            >>> client.document('collek/shun')
+            >>> # is the same as
+            >>> client.document('collek', 'shun')
+
+        For a document in a sub-collection:
+
+        .. code-block:: python
+
+            >>> client.document('mydocs/doc/subcol/child')
+            >>> # is the same as
+            >>> client.document('mydocs', 'doc', 'subcol', 'child')
+
+        Documents in sub-collections can be nested deeper in a similar fashion.
+
+        Args:
+            document_path (Tuple[str, ...]): Can either be
+
+                * A single ``/``-delimited path to a document
+                * A tuple of document path segments
+
+        Returns:
+            :class:`~google.cloud.firestore_v1.document.AsyncDocumentReference`:
+            A reference to a document in a collection.
+        """
+        return AsyncDocumentReference(
+            *self._document_path_helper(*document_path), client=self
+        )
+
+    async def get_all(self, references, field_paths=None, transaction=None):
+        """Retrieve a batch of documents.
+
+        .. note::
+
+           Documents returned by this method are not guaranteed to be
+           returned in the same order that they are given in ``references``.
+
+        .. note::
+
+           If multiple ``references`` refer to the same document, the server
+           will only return one result.
+
+        See :meth:`~google.cloud.firestore_v1.client.Client.field_path` for
+        more information on **field paths**.
+
+        If a ``transaction`` is used and it already has write operations
+        added, this method cannot be used (i.e. read-after-write is not
+        allowed).
+
+        Args:
+            references (List[.AsyncDocumentReference, ...]): Iterable of document
+                references to be retrieved.
+            field_paths (Optional[Iterable[str, ...]]): An iterable of field
+                paths (``.``-delimited list of field names) to use as a
+                projection of document fields in the returned results. If
+                no value is provided, all fields will be returned.
+            transaction (Optional[:class:`~google.cloud.firestore_v1.async_transaction.AsyncTransaction`]):
+                An existing transaction that these ``references`` will be
+                retrieved in.
+
+        Yields:
+            .DocumentSnapshot: The next document snapshot that fulfills the
+            query, or :data:`None` if the document does not exist.
+        """
+        document_paths, reference_map = _reference_info(references)
+        mask = _get_doc_mask(field_paths)
+        response_iterator = self._firestore_api.batch_get_documents(
+            request={
+                "database": self._database_string,
+                "documents": document_paths,
+                "mask": mask,
+                "transaction": _helpers.get_transaction_id(transaction),
+            },
+            metadata=self._rpc_metadata,
+        )
+
+        for get_doc_response in response_iterator:
+            yield _parse_batch_get(get_doc_response, reference_map, self)
+
+    async def collections(self):
+        """List top-level collections of the client's database.
+
+        Returns:
+            Sequence[:class:`~google.cloud.firestore_v1.async_collection.AsyncCollectionReference`]:
+                iterator of subcollections of the current document.
+        """
+        iterator = self._firestore_api.list_collection_ids(
+            request={"parent": "{}/documents".format(self._database_string)},
+            metadata=self._rpc_metadata,
+        )
+
+        while True:
+            for i in iterator.collection_ids:
+                yield self.collection(i)
+            if iterator.next_page_token:
+                iterator = self._firestore_api.list_collection_ids(
+                    request={
+                        "parent": "{}/documents".format(self._database_string),
+                        "page_token": iterator.next_page_token,
+                    },
+                    metadata=self._rpc_metadata,
+                )
+            else:
+                return
+
+        # TODO(microgen): currently this method is rewritten to iterate/page itself.
+        # https://github.com/googleapis/gapic-generator-python/issues/516
+        # it seems the generator ought to be able to do this itself.
+        # iterator.client = self
+        # iterator.item_to_value = _item_to_collection_ref
+        # return iterator
+
+    def batch(self):
+        """Get a batch instance from this client.
+
+        Returns:
+            :class:`~google.cloud.firestore_v1.async_batch.AsyncWriteBatch`:
+            A "write" batch to be used for accumulating document changes and
+            sending the changes all at once.
+        """
+        return AsyncWriteBatch(self)
+
+    def transaction(self, **kwargs):
+        """Get a transaction that uses this client.
+
+        See :class:`~google.cloud.firestore_v1.async_transaction.AsyncTransaction` for
+        more information on transactions and the constructor arguments.
+
+        Args:
+            kwargs (Dict[str, Any]): The keyword arguments (other than
+                ``client``) to pass along to the
+                :class:`~google.cloud.firestore_v1.async_transaction.AsyncTransaction`
+                constructor.
+
+        Returns:
+            :class:`~google.cloud.firestore_v1.async_transaction.AsyncTransaction`:
+            A transaction attached to this client.
+        """
+        return AsyncTransaction(self, **kwargs)