/
bigtable_grpc_transport.py
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/
bigtable_grpc_transport.py
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# -*- coding: utf-8 -*-
#
# Copyright 2020 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://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.
import google.api_core.grpc_helpers
from google.cloud.bigtable_v2.proto import bigtable_pb2_grpc
class BigtableGrpcTransport(object):
"""gRPC transport class providing stubs for
google.bigtable.v2 Bigtable API.
The transport provides access to the raw gRPC stubs,
which can be used to take advantage of advanced
features of gRPC.
"""
# The scopes needed to make gRPC calls to all of the methods defined
# in this service.
_OAUTH_SCOPES = (
"https://www.googleapis.com/auth/bigtable.data",
"https://www.googleapis.com/auth/bigtable.data.readonly",
"https://www.googleapis.com/auth/cloud-bigtable.data",
"https://www.googleapis.com/auth/cloud-bigtable.data.readonly",
"https://www.googleapis.com/auth/cloud-platform",
"https://www.googleapis.com/auth/cloud-platform.read-only",
)
def __init__(
self, channel=None, credentials=None, address="bigtable.googleapis.com:443"
):
"""Instantiate the transport class.
Args:
channel (grpc.Channel): A ``Channel`` instance through
which to make calls. This argument is mutually exclusive
with ``credentials``; providing both will raise an exception.
credentials (google.auth.credentials.Credentials): The
authorization credentials to attach to requests. These
credentials identify this application to the service. If none
are specified, the client will attempt to ascertain the
credentials from the environment.
address (str): The address where the service is hosted.
"""
# If both `channel` and `credentials` are specified, raise an
# exception (channels come with credentials baked in already).
if channel is not None and credentials is not None:
raise ValueError(
"The `channel` and `credentials` arguments are mutually " "exclusive.",
)
# Create the channel.
if channel is None:
channel = self.create_channel(
address=address,
credentials=credentials,
options={
"grpc.max_send_message_length": -1,
"grpc.max_receive_message_length": -1,
}.items(),
)
self._channel = channel
# gRPC uses objects called "stubs" that are bound to the
# channel and provide a basic method for each RPC.
self._stubs = {
"bigtable_stub": bigtable_pb2_grpc.BigtableStub(channel),
}
@classmethod
def create_channel(
cls, address="bigtable.googleapis.com:443", credentials=None, **kwargs
):
"""Create and return a gRPC channel object.
Args:
address (str): The host for the channel to use.
credentials (~.Credentials): The
authorization credentials to attach to requests. These
credentials identify this application to the service. If
none are specified, the client will attempt to ascertain
the credentials from the environment.
kwargs (dict): Keyword arguments, which are passed to the
channel creation.
Returns:
grpc.Channel: A gRPC channel object.
"""
return google.api_core.grpc_helpers.create_channel(
address, credentials=credentials, scopes=cls._OAUTH_SCOPES, **kwargs
)
@property
def channel(self):
"""The gRPC channel used by the transport.
Returns:
grpc.Channel: A gRPC channel object.
"""
return self._channel
@property
def read_rows(self):
"""Return the gRPC stub for :meth:`BigtableClient.read_rows`.
Streams back the contents of all requested rows in key order, optionally
applying the same Reader filter to each. Depending on their size,
rows and cells may be broken up across multiple responses, but
atomicity of each row will still be preserved. See the
ReadRowsResponse documentation for details.
Returns:
Callable: A callable which accepts the appropriate
deserialized request object and returns a
deserialized response object.
"""
return self._stubs["bigtable_stub"].ReadRows
@property
def sample_row_keys(self):
"""Return the gRPC stub for :meth:`BigtableClient.sample_row_keys`.
Returns a sample of row keys in the table. The returned row keys will
delimit contiguous sections of the table of approximately equal size,
which can be used to break up the data for distributed tasks like
mapreduces.
Returns:
Callable: A callable which accepts the appropriate
deserialized request object and returns a
deserialized response object.
"""
return self._stubs["bigtable_stub"].SampleRowKeys
@property
def mutate_row(self):
"""Return the gRPC stub for :meth:`BigtableClient.mutate_row`.
Mutates a row atomically. Cells already present in the row are left
unchanged unless explicitly changed by ``mutation``.
Returns:
Callable: A callable which accepts the appropriate
deserialized request object and returns a
deserialized response object.
"""
return self._stubs["bigtable_stub"].MutateRow
@property
def mutate_rows(self):
"""Return the gRPC stub for :meth:`BigtableClient.mutate_rows`.
Mutates multiple rows in a batch. Each individual row is mutated
atomically as in MutateRow, but the entire batch is not executed
atomically.
Returns:
Callable: A callable which accepts the appropriate
deserialized request object and returns a
deserialized response object.
"""
return self._stubs["bigtable_stub"].MutateRows
@property
def check_and_mutate_row(self):
"""Return the gRPC stub for :meth:`BigtableClient.check_and_mutate_row`.
Mutates a row atomically based on the output of a predicate Reader filter.
Returns:
Callable: A callable which accepts the appropriate
deserialized request object and returns a
deserialized response object.
"""
return self._stubs["bigtable_stub"].CheckAndMutateRow
@property
def read_modify_write_row(self):
"""Return the gRPC stub for :meth:`BigtableClient.read_modify_write_row`.
Modifies a row atomically on the server. The method reads the latest
existing timestamp and value from the specified columns and writes a new
entry based on pre-defined read/modify/write rules. The new value for the
timestamp is the greater of the existing timestamp or the current server
time. The method returns the new contents of all modified cells.
Returns:
Callable: A callable which accepts the appropriate
deserialized request object and returns a
deserialized response object.
"""
return self._stubs["bigtable_stub"].ReadModifyWriteRow