234 lines
7.9 KiB
Python
234 lines
7.9 KiB
Python
# Copyright 2010 Jacob Kaplan-Moss
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# Copyright 2011 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 six.moves.urllib import parse
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from manilaclient.common import cliutils
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from manilaclient import exceptions
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from manilaclient 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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class Manager(utils.HookableMixin):
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"""Manager for CRUD operations.
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Managers interact with a particular type of API (shares, snapshots,
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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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self.client = api.client
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@property
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def api_version(self):
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return self.api.api_version
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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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resource = [obj_class(self, res, loaded=True)
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for res in data if res]
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if 'count' in body:
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return resource, body['count']
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else:
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return resource
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@contextlib.contextmanager
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def completion_cache(self, cache_type, obj_class, mode):
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"""Bash autocompletion items storage.
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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 = cliutils.env('manilaclient_UUID_CACHE_DIR',
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'MANILACLIENT_UUID_CACHE_DIR',
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default="~/.manilaclient")
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# NOTE(sirp): Keep separate UUID caches for each username + endpoint
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# pair
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username = cliutils.env('OS_USERNAME', 'MANILA_USERNAME')
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url = cliutils.env('OS_URL', 'MANILA_URL')
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uniqifier = hashlib.md5(username.encode('utf-8') +
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url.encode('utf-8')).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 _get_with_base_url(self, url, response_key=None):
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resp, body = self.api.client.get_with_base_url(url)
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if response_key:
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return [self.resource_class(self, res, loaded=True)
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for res in body[response_key] if res]
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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, response_key=None, **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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if body:
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if response_key:
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return self.resource_class(self, body[response_key])
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else:
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return self.resource_class(self, body)
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def _build_query_string(self, search_opts):
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query_string = ""
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if search_opts:
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search_opts = utils.unicode_key_value_to_string(search_opts)
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params = sorted(
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[(k, v) for (k, v) in search_opts.items() if v])
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if params:
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query_string = "?%s" % parse.urlencode(params)
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return query_string
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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 = list(kwargs.items())
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search_opts = {'all_tenants': 1}
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for obj in self.list(search_opts=search_opts):
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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, search_opts=None):
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raise NotImplementedError
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