python-designateclient/designateclient/client.py

# Copyright 2012 Managed I.T.
#
# Author: Kiall Mac Innes <kiall@managedit.ie>
#
# 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 abc

from stevedore import extension
from urllib import parse

from oslo_serialization import jsonutils

from designateclient import exceptions


class Controller(metaclass=abc.ABCMeta):

    def __init__(self, client):
        self.client = client

    def build_url(self, url, criterion=None, marker=None, limit=None):
        params = criterion or {}

        if marker is not None:
            params['marker'] = marker
        if limit is not None:
            params['limit'] = limit

        q = parse.urlencode(params) if params else ''
        return '{url}{params}'.format(
            url=url,
            params=f'?{q}'
        )

    def _serialize(self, kwargs):
        headers = kwargs.get('headers')
        content_type = headers.get('Content-Type') if headers else None

        if 'data' in kwargs and content_type in {None, 'application/json'}:
            kwargs['data'] = jsonutils.dumps(kwargs['data'])

    def _post(self, url, response_key=None, **kwargs):
        self._serialize(kwargs)

        resp, body = self.client.session.post(url, **kwargs)
        if response_key is not None:
            return body[response_key]
        return body

    def _get(self, url, response_key=None):
        resp, body = self.client.session.get(url)
        if response_key is not None:
            return body[response_key]
        return body

    def _patch(self, url, response_key=None, **kwargs):
        self._serialize(kwargs)

        resp, body = self.client.session.patch(url, **kwargs)
        if response_key is not None:
            return body[response_key]
        return body

    def _put(self, url, response_key=None, **kwargs):
        self._serialize(kwargs)

        resp, body = self.client.session.put(url, **kwargs)
        if response_key is not None:
            return body[response_key]
        return body

    def _delete(self, url, response_key=None, **kwargs):
        resp, body = self.client.session.delete(url, **kwargs)
        if response_key is not None:
            return body[response_key]
        return body


class CrudController(Controller, metaclass=abc.ABCMeta):

    @abc.abstractmethod
    def list(self, *args, **kw):
        """
        List a resource
        """

    @abc.abstractmethod
    def get(self, *args, **kw):
        """
        Get a resource
        """

    @abc.abstractmethod
    def create(self, *args, **kw):
        """
        Create a resource
        """

    @abc.abstractmethod
    def update(self, *args, **kw):
        """
        Update a resource
        """

    @abc.abstractmethod
    def delete(self, *args, **kw):
        """
        Delete a resource
            """


def get_versions():
    mgr = extension.ExtensionManager('designateclient.versions')
    return {ep.name: ep.plugin for ep in mgr.extensions}


def Client(version, *args, **kwargs):  # noqa
    versions = get_versions()
    if version not in versions:
        msg = 'Version {} is not supported, use one of ({})'.format(
            version, list(versions.keys())
        )
        raise exceptions.UnsupportedVersion(msg)
    return versions[version](*args, **kwargs)