# Copyright 2019 Atalaya Tech, Inc.

# 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.

import subprocess

from bentoml.exceptions import BentoMLException, MissingDependencyException


def ensure_node_available_or_raise():
    try:
        subprocess.check_output(['node', '--version'])
    except subprocess.CalledProcessError as error:
        raise BentoMLException(
            'Error executing node command: {}'.format(error.output.decode())
        )
    except FileNotFoundError:
        raise MissingDependencyException(
            'Node is required for Yatai web UI. Please visit '
            'www.nodejs.org for instructions'
        )
