# 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 functools

import docker


class DockerClient(object):
    """Decorator and contextmanager for providing the Docker connection."""
    def __enter__(self):
        self.dc = docker.Client()
        return self.dc

    def __exit__(self, *args, **kwargs):
        self.dc.close()

    def __call__(self, f):
        @functools.wraps(f)
        def wrapper(*args, **kwargs):
            with self as dc:
                return f(dc, *args, **kwargs)
        return wrapper
