297 lines
9.5 KiB
Python
297 lines
9.5 KiB
Python
# Copyright 2010 Jacob Kaplan-Moss
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# Copyright 2012 OpenStack Foundation
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# All Rights Reserved.
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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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"""
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Base utilities to build API operation managers and objects on top of.
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"""
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import contextlib
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import hashlib
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import os
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from oslo_utils import reflection
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from oslo_utils import strutils
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from troveclient.compat import exceptions
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from troveclient.compat import utils
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# Python 2.4 compat
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try:
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all
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except NameError:
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def all(iterable):
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return True not in (not x for x in iterable)
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def getid(obj):
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"""Retrives an id from object or integer.
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Abstracts the common pattern of allowing both an object or an object's
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ID as a parameter when dealing with relationships.
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"""
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try:
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return obj.id
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except AttributeError:
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return obj
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class Manager(utils.HookableMixin):
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"""Manager defining CRUD operations for API.
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Managers interact with a particular type of API (servers, flavors,
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images, etc.) and provide CRUD operations for them.
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"""
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resource_class = None
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def __init__(self, api):
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self.api = api
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def _list(self, url, response_key, obj_class=None, body=None):
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resp = None
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if body:
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resp, body = self.api.client.post(url, body=body)
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else:
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resp, body = self.api.client.get(url)
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if obj_class is None:
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obj_class = self.resource_class
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data = body[response_key]
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# NOTE(ja): keystone returns values as list as {'values': [ ... ]}
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# unlike other services which just return the list...
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if isinstance(data, dict):
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try:
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data = data['values']
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except KeyError:
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pass
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with self.completion_cache('human_id', obj_class, mode="w"):
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with self.completion_cache('uuid', obj_class, mode="w"):
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return [obj_class(self, res, loaded=True)
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for res in data if res]
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@contextlib.contextmanager
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def completion_cache(self, cache_type, obj_class, mode):
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"""Bash-completion cache.
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The completion cache store items that can be used for bash
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autocompletion, like UUIDs or human-friendly IDs.
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A resource listing will clear and repopulate the cache.
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A resource create will append to the cache.
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Delete is not handled because listings are assumed to be performed
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often enough to keep the cache reasonably up-to-date.
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"""
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base_dir = utils.env('REDDWARFCLIENT_ID_CACHE_DIR',
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default="~/.troveclient")
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# NOTE(sirp): Keep separate UUID caches for each username + endpoint
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# pair
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username = utils.env('OS_USERNAME', 'USERNAME')
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url = utils.env('OS_URL', 'SERVICE_URL')
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uniqifier = hashlib.md5(username + url).hexdigest()
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cache_dir = os.path.expanduser(os.path.join(base_dir, uniqifier))
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try:
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os.makedirs(cache_dir, 0o755)
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except OSError:
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# NOTE(kiall): This is typically either permission denied while
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# attempting to create the directory, or the directory
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# already exists. Either way, don't fail.
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pass
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resource = obj_class.__name__.lower()
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filename = "%s-%s-cache" % (resource, cache_type.replace('_', '-'))
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path = os.path.join(cache_dir, filename)
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cache_attr = "_%s_cache" % cache_type
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try:
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setattr(self, cache_attr, open(path, mode))
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except IOError:
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# NOTE(kiall): This is typically a permission denied while
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# attempting to write the cache file.
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pass
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try:
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yield
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finally:
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cache = getattr(self, cache_attr, None)
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if cache:
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cache.close()
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delattr(self, cache_attr)
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def write_to_completion_cache(self, cache_type, val):
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cache = getattr(self, "_%s_cache" % cache_type, None)
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if cache:
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cache.write("%s\n" % val)
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def _get(self, url, response_key=None):
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resp, body = self.api.client.get(url)
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if response_key:
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return self.resource_class(self, body[response_key], loaded=True)
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else:
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return self.resource_class(self, body, loaded=True)
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def _create(self, url, body, response_key, return_raw=False, **kwargs):
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self.run_hooks('modify_body_for_create', body, **kwargs)
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resp, body = self.api.client.post(url, body=body)
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if return_raw:
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return body[response_key]
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with self.completion_cache('human_id', self.resource_class, mode="a"):
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with self.completion_cache('uuid', self.resource_class, mode="a"):
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return self.resource_class(self, body[response_key])
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def _delete(self, url):
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resp, body = self.api.client.delete(url)
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def _update(self, url, body, **kwargs):
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self.run_hooks('modify_body_for_update', body, **kwargs)
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resp, body = self.api.client.put(url, body=body)
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return body
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class ManagerWithFind(Manager):
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"""Like a `Manager`, but with additional `find()`/`findall()` methods."""
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def find(self, **kwargs):
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"""Find a single item with attributes matching ``**kwargs``.
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This isn't very efficient: it loads the entire list then filters on
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the Python side.
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"""
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matches = self.findall(**kwargs)
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num_matches = len(matches)
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if num_matches == 0:
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msg = "No %s matching %s." % (self.resource_class.__name__, kwargs)
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raise exceptions.NotFound(404, msg)
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elif num_matches > 1:
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raise exceptions.NoUniqueMatch
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else:
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return matches[0]
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def findall(self, **kwargs):
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"""Find all items with attributes matching ``**kwargs``.
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This isn't very efficient: it loads the entire list then filters on
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the Python side.
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"""
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found = []
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searches = kwargs.items()
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for obj in self.list():
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try:
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if all(getattr(obj, attr) == value
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for (attr, value) in searches):
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found.append(obj)
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except AttributeError:
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continue
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return found
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def list(self):
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raise NotImplementedError
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class Resource(object):
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"""A resource represents a particular instance of an object like server.
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This is pretty much just a bag for attributes.
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:param manager: Manager object
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:param info: dictionary representing resource attributes
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:param loaded: prevent lazy-loading if set to True
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"""
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HUMAN_ID = False
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def __init__(self, manager, info, loaded=False):
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self.manager = manager
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self._info = info
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self._add_details(info)
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self._loaded = loaded
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# NOTE(sirp): ensure `id` is already present because if it isn't we'll
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# enter an infinite loop of __getattr__ -> get -> __init__ ->
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# __getattr__ -> ...
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if 'id' in self.__dict__ and len(str(self.id)) == 36:
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self.manager.write_to_completion_cache('uuid', self.id)
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human_id = self.human_id
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if human_id:
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self.manager.write_to_completion_cache('human_id', human_id)
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@property
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def human_id(self):
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"""Provides a pretty ID which can be used for bash completion."""
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if 'name' in self.__dict__ and self.HUMAN_ID:
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return strutils.to_slug(self.name)
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return None
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def _add_details(self, info):
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for (k, v) in info.items():
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try:
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setattr(self, k, v)
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except AttributeError:
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# In this case we already defined the attribute on the class
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pass
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def __getattr__(self, k):
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if k not in self.__dict__:
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# NOTE(bcwaldon): disallow lazy-loading if already loaded once
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if not self.is_loaded():
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self.get()
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return self.__getattr__(k)
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raise AttributeError(k)
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else:
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return self.__dict__[k]
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def __repr__(self):
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reprkeys = sorted(k for k in self.__dict__.keys()
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if k[0] != '_' and k != 'manager')
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info = ", ".join("%s=%s" % (k, getattr(self, k)) for k in reprkeys)
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self_cls_name = reflection.get_class_name(self,
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fully_qualified=False)
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return "<%s %s>" % (self_cls_name, info)
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def get(self):
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# set_loaded() first ... so if we have to bail, we know we tried.
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self.set_loaded(True)
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if not hasattr(self.manager, 'get'):
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return
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new = self.manager.get(self.id)
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if new:
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self._add_details(new._info)
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def __eq__(self, other):
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if not isinstance(other, self.__class__):
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return False
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if hasattr(self, 'id') and hasattr(other, 'id'):
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return self.id == other.id
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return self._info == other._info
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def is_loaded(self):
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return self._loaded
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def set_loaded(self, val):
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self._loaded = val
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