gRPC C++ samples for Google Assistant SDK

Requirements

This project is officially supported on Ubuntu 14.04. Other Linux distributions may be able to run this sample.

Refer to the Assistant SDK documentation for more information.

Setup instructions

1. Remove previously installed Protobuf/gRPC/related packages and files. If you have not setup before, you can skip this step:

sudo apt-get purge libc-ares-dev  # https://github.com/grpc/grpc/pull/10706#issuecomment-302775038
sudo apt-get purge libprotobuf-dev libprotoc-dev
sudo rm -rf /usr/local/bin/grpc_* /usr/local/bin/protoc \
    /usr/local/include/google/protobuf/ /usr/local/include/grpc/ /usr/local/include/grpc++/ \
    /usr/local/lib/libproto* /usr/local/lib/libgpr* /usr/local/lib/libgrpc* \
    /usr/local/lib/pkgconfig/protobuf* /usr/local/lib/pkgconfig/grpc* \
    /usr/local/share/grpc/

2. Install dependencies

sudo apt-get install autoconf automake libtool build-essential curl unzip
sudo apt-get install libasound2-dev  # For ALSA sound output
sudo apt-get install libcurl4-openssl-dev # CURL development library

3. Build Protocol Buffer, gRPC and Google APIs

git clone -b $(curl -L https://grpc.io/release) https://github.com/grpc/grpc
cd grpc/
git submodule update --init

cd third_party/protobuf
./autogen.sh && ./configure && make
sudo make install
sudo ldconfig

cd ../../
make
sudo make install
sudo ldconfig

cd ../
git clone https://github.com/googleapis/googleapis.git
cd googleapis/
make LANGUAGE=cpp

4. Make sure you setup env variable $GOOGLEAPIS_GENS_PATH

export GOOGLEAPIS_GENS_PATH=`pwd`/gens

5. Clone and build assistant-grpc

cd ../
git clone https://github.com/googlesamples/assistant-sdk-cpp.git

cd assistant-sdk-cpp/
make run_assistant

6. Get credentials file. It can be either an end-user's credentials, or a service account's credentials.

For end-user's credentials:

• Download the client secret json file from Google Cloud Platform Console following these instructions
• Move it in this folder and rename it to client_secret.json
• run get_credentials.sh in this folder. It will create the file credentials.json.

For service account's credentials in Google Cloud Platform Console:

• Open API Manager -> Credentials
• Click Create credentials -> Service account key. Choose key type JSON, and click Create
• The service account's credentials JSON file will be downloaded. Notice that this JSON file can only be downloaded once, so keep it for future reference.

7. Start run_assistant

./run_assistant --audio_input ./resources/switch_to_channel_5.raw --credentials_file ./credentials.json --credentials_type USER_ACCOUNT
./run_assistant --audio_input ./resources/weather_in_mountain_view.raw --credentials_file <YOUR_SERVICE_ACCOUNT_JSON> --credentials_type SERVICE_ACCOUNT
# On Linux workstation, you can also use ALSA audio input:
./run_assistant --audio_input ALSA_INPUT --credentials_file ./credentials.json --credentials_type USER_ACCOUNT

Default Assistant gRPC API endpoint is embeddedassistant.googleapis.com. If you want to test with a custom Assistant gRPC API endpoint, you can pass an extra "--api_endpoint CUSTOM_API_ENDPOINT" to run_assistant.