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video_intelligence_service_grpc_transport.py
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video_intelligence_service_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
import google.api_core.operations_v1
from google.cloud.videointelligence_v1.proto import video_intelligence_pb2_grpc
class VideoIntelligenceServiceGrpcTransport(object):
"""gRPC transport class providing stubs for
google.cloud.videointelligence.v1 VideoIntelligenceService 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/cloud-platform",)
def __init__(
self,
channel=None,
credentials=None,
address="videointelligence.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 = {
"video_intelligence_service_stub": video_intelligence_pb2_grpc.VideoIntelligenceServiceStub(
channel
)
}
# Because this API includes a method that returns a
# long-running operation (proto: google.longrunning.Operation),
# instantiate an LRO client.
self._operations_client = google.api_core.operations_v1.OperationsClient(
channel
)
@classmethod
def create_channel(
cls, address="videointelligence.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 annotate_video(self):
"""Return the gRPC stub for :meth:`VideoIntelligenceServiceClient.annotate_video`.
Performs asynchronous video annotation. Progress and results can be
retrieved through the ``google.longrunning.Operations`` interface.
``Operation.metadata`` contains ``AnnotateVideoProgress`` (progress).
``Operation.response`` contains ``AnnotateVideoResponse`` (results).
Returns:
Callable: A callable which accepts the appropriate
deserialized request object and returns a
deserialized response object.
"""
return self._stubs["video_intelligence_service_stub"].AnnotateVideo