265 lines
12 KiB
Python
265 lines
12 KiB
Python
# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import six
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from openstack import _adapter
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from openstack._meta import proxy as _meta
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from openstack import exceptions
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from openstack import resource
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# The _check_resource decorator is used on Proxy methods to ensure that
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# the `actual` argument is in fact the type of the `expected` argument.
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# It does so under two cases:
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# 1. When strict=False, if and only if `actual` is a Resource instance,
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# it is checked to see that it's an instance of the `expected` class.
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# This allows `actual` to be other types, such as strings, when it makes
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# sense to accept a raw id value.
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# 2. When strict=True, `actual` must be an instance of the `expected` class.
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def _check_resource(strict=False):
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def wrap(method):
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def check(self, expected, actual=None, *args, **kwargs):
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if (strict and actual is not None and not
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isinstance(actual, resource.Resource)):
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raise ValueError("A %s must be passed" % expected.__name__)
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elif (isinstance(actual, resource.Resource) and not
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isinstance(actual, expected)):
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raise ValueError("Expected %s but received %s" % (
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expected.__name__, actual.__class__.__name__))
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return method(self, expected, actual, *args, **kwargs)
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return check
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return wrap
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class Proxy(six.with_metaclass(_meta.ProxyMeta, _adapter.OpenStackSDKAdapter)):
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"""Represents a service."""
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def _get_resource(self, resource_type, value, **attrs):
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"""Get a resource object to work on
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:param resource_type: The type of resource to operate on. This should
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be a subclass of
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:class:`~openstack.resource.Resource` with a
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``from_id`` method.
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:param value: The ID of a resource or an object of ``resource_type``
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class if using an existing instance, or ``munch.Munch``,
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or None to create a new instance.
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:param path_args: A dict containing arguments for forming the request
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URL, if needed.
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"""
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if value is None:
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# Create a bare resource
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res = resource_type.new(**attrs)
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elif (isinstance(value, dict)
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and not isinstance(value, resource.Resource)):
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res = resource_type._from_munch(value)
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res._update(**attrs)
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elif not isinstance(value, resource_type):
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# Create from an ID
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res = resource_type.new(id=value, **attrs)
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else:
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# An existing resource instance
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res = value
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res._update(**attrs)
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return res
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def _get_uri_attribute(self, child, parent, name):
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"""Get a value to be associated with a URI attribute
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`child` will not be None here as it's a required argument
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on the proxy method. `parent` is allowed to be None if `child`
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is an actual resource, but when an ID is given for the child
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one must also be provided for the parent. An example of this
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is that a parent is a Server and a child is a ServerInterface.
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"""
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if parent is None:
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value = getattr(child, name)
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else:
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value = resource.Resource._get_id(parent)
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return value
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def _find(self, resource_type, name_or_id, ignore_missing=True,
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**attrs):
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"""Find a resource
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:param name_or_id: The name or ID of a resource to find.
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:param bool ignore_missing: When set to ``False``
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:class:`~openstack.exceptions.ResourceNotFound` will be
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raised when the resource does not exist.
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When set to ``True``, None will be returned when
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attempting to find a nonexistent resource.
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:param dict attrs: Attributes to be passed onto the
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:meth:`~openstack.resource.Resource.find`
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method, such as query parameters.
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:returns: An instance of ``resource_type`` or None
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"""
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return resource_type.find(self, name_or_id,
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ignore_missing=ignore_missing,
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**attrs)
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@_check_resource(strict=False)
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def _delete(self, resource_type, value, ignore_missing=True, **attrs):
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"""Delete a resource
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:param resource_type: The type of resource to delete. This should
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be a :class:`~openstack.resource.Resource`
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subclass with a ``from_id`` method.
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:param value: The value to delete. Can be either the ID of a
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resource or a :class:`~openstack.resource.Resource`
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subclass.
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:param bool ignore_missing: When set to ``False``
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:class:`~openstack.exceptions.ResourceNotFound` will be
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raised when the resource does not exist.
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When set to ``True``, no exception will be set when
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attempting to delete a nonexistent resource.
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:param dict attrs: Attributes to be passed onto the
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:meth:`~openstack.resource.Resource.delete`
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method, such as the ID of a parent resource.
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:returns: The result of the ``delete``
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:raises: ``ValueError`` if ``value`` is a
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:class:`~openstack.resource.Resource` that doesn't match
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the ``resource_type``.
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:class:`~openstack.exceptions.ResourceNotFound` when
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ignore_missing if ``False`` and a nonexistent resource
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is attempted to be deleted.
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"""
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res = self._get_resource(resource_type, value, **attrs)
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try:
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rv = res.delete(self)
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except exceptions.ResourceNotFound:
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if ignore_missing:
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return None
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raise
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return rv
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@_check_resource(strict=False)
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def _update(self, resource_type, value, **attrs):
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"""Update a resource
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:param resource_type: The type of resource to update.
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:type resource_type: :class:`~openstack.resource.Resource`
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:param value: The resource to update. This must either be a
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:class:`~openstack.resource.Resource` or an id
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that corresponds to a resource.
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:param dict attrs: Attributes to be passed onto the
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:meth:`~openstack.resource.Resource.update`
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method to be updated. These should correspond
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to either :class:`~openstack.resource.Body`
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or :class:`~openstack.resource.Header`
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values on this resource.
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:returns: The result of the ``update``
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:rtype: :class:`~openstack.resource.Resource`
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"""
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res = self._get_resource(resource_type, value, **attrs)
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return res.commit(self)
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def _create(self, resource_type, **attrs):
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"""Create a resource from attributes
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:param resource_type: The type of resource to create.
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:type resource_type: :class:`~openstack.resource.Resource`
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:param path_args: A dict containing arguments for forming the request
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URL, if needed.
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:param dict attrs: Attributes to be passed onto the
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:meth:`~openstack.resource.Resource.create`
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method to be created. These should correspond
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to either :class:`~openstack.resource.Body`
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or :class:`~openstack.resource.Header`
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values on this resource.
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:returns: The result of the ``create``
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:rtype: :class:`~openstack.resource.Resource`
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"""
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res = resource_type.new(**attrs)
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return res.create(self)
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@_check_resource(strict=False)
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def _get(self, resource_type, value=None, requires_id=True, **attrs):
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"""Fetch a resource
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:param resource_type: The type of resource to get.
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:type resource_type: :class:`~openstack.resource.Resource`
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:param value: The value to get. Can be either the ID of a
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resource or a :class:`~openstack.resource.Resource`
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subclass.
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:param dict attrs: Attributes to be passed onto the
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:meth:`~openstack.resource.Resource.get`
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method. These should correspond
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to either :class:`~openstack.resource.Body`
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or :class:`~openstack.resource.Header`
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values on this resource.
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:returns: The result of the ``fetch``
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:rtype: :class:`~openstack.resource.Resource`
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"""
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res = self._get_resource(resource_type, value, **attrs)
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return res.fetch(
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self, requires_id=requires_id,
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error_message="No {resource_type} found for {value}".format(
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resource_type=resource_type.__name__, value=value))
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def _list(self, resource_type, value=None, paginated=False, **attrs):
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"""List a resource
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:param resource_type: The type of resource to delete. This should
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be a :class:`~openstack.resource.Resource`
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subclass with a ``from_id`` method.
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:param value: The resource to list. It can be the ID of a resource, or
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a :class:`~openstack.resource.Resource` object. When set
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to None, a new bare resource is created.
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:param bool paginated: When set to ``False``, expect all of the data
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to be returned in one response. When set to
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``True``, the resource supports data being
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returned across multiple pages.
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:param dict attrs: Attributes to be passed onto the
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:meth:`~openstack.resource.Resource.list` method. These should
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correspond to either :class:`~openstack.resource.URI` values
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or appear in :data:`~openstack.resource.Resource._query_mapping`.
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:returns: A generator of Resource objects.
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:raises: ``ValueError`` if ``value`` is a
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:class:`~openstack.resource.Resource` that doesn't match
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the ``resource_type``.
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"""
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res = self._get_resource(resource_type, value, **attrs)
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return res.list(self, paginated=paginated, **attrs)
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def _head(self, resource_type, value=None, **attrs):
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"""Retrieve a resource's header
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:param resource_type: The type of resource to retrieve.
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:type resource_type: :class:`~openstack.resource.Resource`
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:param value: The value of a specific resource to retreive headers
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for. Can be either the ID of a resource,
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a :class:`~openstack.resource.Resource` subclass,
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or ``None``.
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:param dict attrs: Attributes to be passed onto the
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:meth:`~openstack.resource.Resource.head` method.
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These should correspond to
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:class:`~openstack.resource.URI` values.
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:returns: The result of the ``head`` call
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:rtype: :class:`~openstack.resource.Resource`
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"""
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res = self._get_resource(resource_type, value, **attrs)
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return res.head(self)
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