google-assistant-grpc

Google Assistant Service Bindings for Python

This package contains the generated Python bindings for the Google Assistant Service. It is part of the Google Assistant SDK.

This package should be compatible with POSIX platforms supporting gRPC and Python.

Note

The Google Assistant Service is available for non-commercial use.

Installing

• You can install using pip.:

  pip install --upgrade google-assistant-grpc
  

Authorization

• Follow the steps to configure the Actions Console project and the Google account.

• Follow the steps to register a new device model and download the client secrets file.

• Generate device credentials using google-oauthlib-tool:

  pip install --upgrade google-auth-oauthlib[tool] google-oauthlib-tool --client-secrets path/to/client_secret_<client-id>.json --scope https://www.googleapis.com/auth/assistant-sdk-prototype --save --headless

• Load the device credentials using google.oauth2.credentials.:

  import io
  import google.oauth2.credentials
  
  with io.open('/path/to/credentials.json', 'r') as f:
      credentials = google.oauth2.credentials.Credentials(token=None,
                                                          **json.load(f))
  

• Initialize the gRPC channel using google.auth.transport.grpc.

Usage

• Initialize the gRPC stubs using google.assistant.embedded.v1alpha1.embedded_assistant_pb2_grpc.:

  import google.assistant.embedded.v1alpha1.embedded_assistant_pb2_grpc
  assistant = embedded_assistant_pb2.EmbeddedAssistantStub(channel)
  

• Call the Assist streaming method. It takes a generator of AssistRequest and returns a generator of AssistResponse.:

  assist_responses_generator = assistant.Assist(assist_requests_generator)
  start_acquiring_audio()
  

• Send a AssistRequest message with audio configuration parameters followed by multiple outgoing AssistRequest messages containing the audio data of the Assistant request.:

  import google.assistant.embedded.v1alpha1.embedded_assistant_pb2
  
  def generate_assist_requests():
      yield embedded_assistant_pb2.AssistConfig(
          audio_in_config=embedded_assistant_pb2.AudioInConfig(
              encoding='LINEAR16',
              sample_rate_hertz=16000,
          ),
          audio_out_config=embedded_assistant_pb2.AudioOutConfig(
              encoding='LINEAR16',
              sample_rate_hertz=16000,
          ),
          device_config=embedded_assistant_pb2.DeviceConfig(
              device_id=device_id,
              device_model_id=device_model_id,
          )
      )
      for data in acquire_audio_data():
          yield embedded_assistant_pb2.AssistRequest(audio_in=data)
  

• Handle the incoming stream of AssistResponse messages:

  • Stop recording when receiving a AssistResponse with the EventType message set to END_OF_UTTERANCE.
  • Get transcription of the user query from the SpeechRecognitionResult field.
  • Get conversation metadata like supplemental display text from the Assistant from the DialogStateOut field.
  • Extract the audio data of the Assistant response from the AudioOut field.

for assist_response in assist_response_generator:
    if resp.event_type == END_OF_UTTERANCE:
       stop_acquiring_audio()
    if resp.speech_results:
       print(' '.join(r.transcript for r in resp.speech_results)
    if resp.dialog_state_out.supplemental_display_text:
       print(resp.dialog_state_out.supplemental_display_text)
    if len(resp.audio_out.audio_data) > 0:
       playback_audio_data(resp.audio_out.audio_data)

Reference

• gRPC reference sample.
• Google Assistant Service reference.

For Maintainers

See MAINTAINER.md for more documentation on the development, maintainance and release of the Python package itself.

License

Copyright (C) 2017 Google Inc.

Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to you 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.