241 lines
8.0 KiB
Python
241 lines
8.0 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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#
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# 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 collections
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import re
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from heat.openstack.common.py3kcompat import urlutils
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from heat.openstack.common import strutils
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class HeatIdentifier(collections.Mapping):
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FIELDS = (
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TENANT, STACK_NAME, STACK_ID, PATH
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) = (
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'tenant', 'stack_name', 'stack_id', 'path'
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)
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path_re = re.compile(r'stacks/([^/]+)/([^/]+)(.*)')
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def __init__(self, tenant, stack_name, stack_id, path=''):
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'''
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Initialise a HeatIdentifier from a Tenant ID, Stack name, Stack ID
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and optional path. If a path is supplied and it does not begin with
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"/", a "/" will be prepended.
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'''
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if path and not path.startswith('/'):
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path = '/' + path
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if '/' in stack_name:
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raise ValueError(_('Stack name may not contain "/"'))
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self.identity = {
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self.TENANT: tenant,
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self.STACK_NAME: stack_name,
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self.STACK_ID: str(stack_id),
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self.PATH: path,
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}
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@classmethod
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def from_arn(cls, arn):
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'''
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Return a new HeatIdentifier generated by parsing the supplied ARN.
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'''
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fields = arn.split(':')
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if len(fields) < 6 or fields[0].lower() != 'arn':
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raise ValueError(_('"%s" is not a valid ARN') % arn)
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id_fragment = ':'.join(fields[5:])
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path = cls.path_re.match(id_fragment)
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if fields[1] != 'openstack' or fields[2] != 'heat' or not path:
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raise ValueError(_('"%s" is not a valid Heat ARN') % arn)
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return cls(urlutils.unquote(fields[4]),
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urlutils.unquote(path.group(1)),
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urlutils.unquote(path.group(2)),
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urlutils.unquote(path.group(3)))
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@classmethod
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def from_arn_url(cls, url):
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'''
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Return a new HeatIdentifier generated by parsing the supplied URL
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The URL is expected to contain a valid arn as part of the path
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'''
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# Sanity check the URL
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urlp = urlutils.urlparse(url)
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if (urlp.scheme not in ('http', 'https') or
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not urlp.netloc or not urlp.path):
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raise ValueError(_('"%s" is not a valid URL') % url)
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# Remove any query-string and extract the ARN
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arn_url_prefix = '/arn%3Aopenstack%3Aheat%3A%3A'
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match = re.search(arn_url_prefix, urlp.path, re.IGNORECASE)
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if match is None:
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raise ValueError(_('"%s" is not a valid ARN URL') % url)
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# the +1 is to skip the leading /
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url_arn = urlp.path[match.start() + 1:]
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arn = urlutils.unquote(url_arn)
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return cls.from_arn(arn)
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def arn(self):
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'''
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Return an ARN of the form:
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arn:openstack:heat::<tenant>:stacks/<stack_name>/<stack_id><path>
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'''
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return 'arn:openstack:heat::%s:%s' % (urlutils.quote(self.tenant, ''),
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self._tenant_path())
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def arn_url_path(self):
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'''
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Return an ARN quoted correctly for use in a URL
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'''
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return '/' + urlutils.quote(self.arn(), '')
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def url_path(self):
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'''
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Return a URL-encoded path segment of a URL in the form:
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<tenant>/stacks/<stack_name>/<stack_id><path>
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'''
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return '/'.join((urlutils.quote(self.tenant, ''), self._tenant_path()))
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def _tenant_path(self):
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'''
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Return a URL-encoded path segment of a URL within a particular tenant,
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in the form:
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stacks/<stack_name>/<stack_id><path>
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'''
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return 'stacks/%s/%s%s' % (urlutils.quote(self.stack_name, ''),
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urlutils.quote(self.stack_id, ''),
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urlutils.quote(strutils.safe_encode(
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self.path)))
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def _path_components(self):
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'''Return a list of the path components.'''
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return self.path.lstrip('/').split('/')
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def __getattr__(self, attr):
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'''
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Return one of the components of the identity when accessed as an
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attribute.
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'''
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if attr not in self.FIELDS:
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raise AttributeError(_('Unknown attribute "%s"') % attr)
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return self.identity[attr]
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def __getitem__(self, key):
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'''Return one of the components of the identity.'''
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if key not in self.FIELDS:
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raise KeyError(_('Unknown attribute "%s"') % key)
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return self.identity[key]
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def __len__(self):
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'''Return the number of components in an identity.'''
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return len(self.FIELDS)
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def __contains__(self, key):
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return key in self.FIELDS
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def __iter__(self):
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return iter(self.FIELDS)
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def __repr__(self):
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return repr(dict(self))
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class ResourceIdentifier(HeatIdentifier):
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'''An identifier for a resource.'''
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RESOURCE_NAME = 'resource_name'
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def __init__(self, tenant, stack_name, stack_id, path,
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resource_name=None):
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'''
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Return a new Resource identifier based on the identifier components of
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the owning stack and the resource name.
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'''
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if resource_name is not None:
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if '/' in resource_name:
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raise ValueError(_('Resource name may not contain "/"'))
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path = '/'.join([path.rstrip('/'), 'resources', resource_name])
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super(ResourceIdentifier, self).__init__(tenant,
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stack_name,
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stack_id,
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path)
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def __getattr__(self, attr):
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'''
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Return one of the components of the identity when accessed as an
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attribute.
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'''
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if attr == self.RESOURCE_NAME:
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return self._path_components()[-1]
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return HeatIdentifier.__getattr__(self, attr)
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def stack(self):
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'''
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Return a HeatIdentifier for the owning stack
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'''
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return HeatIdentifier(self.tenant, self.stack_name, self.stack_id,
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'/'.join(self._path_components()[:-2]))
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class EventIdentifier(HeatIdentifier):
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'''An identifier for an event.'''
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(RESOURCE_NAME, EVENT_ID) = (ResourceIdentifier.RESOURCE_NAME, 'event_id')
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def __init__(self, tenant, stack_name, stack_id, path,
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event_id=None):
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'''
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Return a new Event identifier based on the identifier components of
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the associated resource and the event ID.
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'''
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if event_id is not None:
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path = '/'.join([path.rstrip('/'), 'events', event_id])
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super(EventIdentifier, self).__init__(tenant,
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stack_name,
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stack_id,
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path)
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def __getattr__(self, attr):
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'''
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Return one of the components of the identity when accessed as an
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attribute.
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'''
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if attr == self.RESOURCE_NAME:
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return getattr(self.resource(), attr)
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if attr == self.EVENT_ID:
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return self._path_components()[-1]
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return HeatIdentifier.__getattr__(self, attr)
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def resource(self):
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'''
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Return a HeatIdentifier for the owning resource
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'''
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return ResourceIdentifier(self.tenant, self.stack_name, self.stack_id,
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'/'.join(self._path_components()[:-2]))
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def stack(self):
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'''
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Return a HeatIdentifier for the owning stack
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'''
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return self.resource().stack()
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