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Diffstat (limited to 'saharaclient/nova/base.py')
| -rw-r--r-- | saharaclient/nova/base.py | 487 |
1 files changed, 487 insertions, 0 deletions
diff --git a/saharaclient/nova/base.py b/saharaclient/nova/base.py new file mode 100644 index 0000000..9667b8d --- /dev/null +++ b/saharaclient/nova/base.py @@ -0,0 +1,487 @@ +# Copyright 2010 Jacob Kaplan-Moss + +# Copyright 2011 OpenStack Foundation +# All Rights Reserved. +# +# 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. + +""" +Base utilities to build API operation managers and objects on top of. +""" + +import abc +import base64 +import contextlib +import hashlib +import inspect +import os +import threading + +import six + +from saharaclient.nova import utils +from saharaclient.openstack.common.apiclient import exceptions +from saharaclient.openstack.common import strutils + + +def getid(obj): + """Abstracts the common pattern of allowing both an object or an object's + ID as a parameter when dealing with relationships. + """ + try: + return obj.id + except AttributeError: + return obj + + +class Manager(utils.HookableMixin): + """Managers interact with a particular type of API (servers, flavors, + images, etc.) and provide CRUD operations for them. + """ + resource_class = None + cache_lock = threading.RLock() + + def __init__(self, api): + self.api = api + + def _list(self, url, response_key, obj_class=None, body=None): + if body: + _resp, body = self.api.client.post(url, body=body) + else: + _resp, body = self.api.client.get(url) + + if obj_class is None: + obj_class = self.resource_class + + data = body[response_key] + # NOTE(ja): keystone returns values as list as {'values': [ ... ]} + # unlike other services which just return the list... + if isinstance(data, dict): + try: + data = data['values'] + except KeyError: + pass + + with self.completion_cache('human_id', obj_class, mode="w"): + with self.completion_cache('uuid', obj_class, mode="w"): + return [obj_class(self, res, loaded=True) + for res in data if res] + + @contextlib.contextmanager + def completion_cache(self, cache_type, obj_class, mode): + """The completion cache store items that can be used for bash + autocompletion, like UUIDs or human-friendly IDs. + + A resource listing will clear and repopulate the cache. + + A resource create will append to the cache. + + Delete is not handled because listings are assumed to be performed + often enough to keep the cache reasonably up-to-date. + """ + # NOTE(wryan): This lock protects read and write access to the + # completion caches + with self.cache_lock: + base_dir = utils.env('NOVACLIENT_UUID_CACHE_DIR', + default="~/.novaclient") + + # NOTE(sirp): Keep separate UUID caches for each username + + # endpoint pair + username = utils.env('OS_USERNAME', 'NOVA_USERNAME') + url = utils.env('OS_URL', 'NOVA_URL') + uniqifier = hashlib.md5(username.encode('utf-8') + + url.encode('utf-8')).hexdigest() + + cache_dir = os.path.expanduser(os.path.join(base_dir, uniqifier)) + + try: + os.makedirs(cache_dir, 0o755) + except OSError: + # NOTE(kiall): This is typically either permission denied while + # attempting to create the directory, or the + # directory already exists. Either way, don't + # fail. + pass + + resource = obj_class.__name__.lower() + filename = "%s-%s-cache" % (resource, cache_type.replace('_', '-')) + path = os.path.join(cache_dir, filename) + + cache_attr = "_%s_cache" % cache_type + + try: + setattr(self, cache_attr, open(path, mode)) + except IOError: + # NOTE(kiall): This is typically a permission denied while + # attempting to write the cache file. + pass + + try: + yield + finally: + cache = getattr(self, cache_attr, None) + if cache: + cache.close() + delattr(self, cache_attr) + + def write_to_completion_cache(self, cache_type, val): + cache = getattr(self, "_%s_cache" % cache_type, None) + if cache: + cache.write("%s\n" % val) + + def _get(self, url, response_key): + _resp, body = self.api.client.get(url) + return self.resource_class(self, body[response_key], loaded=True) + + def _create(self, url, body, response_key, return_raw=False, **kwargs): + self.run_hooks('modify_body_for_create', body, **kwargs) + _resp, body = self.api.client.post(url, body=body) + if return_raw: + return body[response_key] + + with self.completion_cache('human_id', self.resource_class, mode="a"): + with self.completion_cache('uuid', self.resource_class, mode="a"): + return self.resource_class(self, body[response_key]) + + def _delete(self, url): + _resp, _body = self.api.client.delete(url) + + def _update(self, url, body, response_key=None, **kwargs): + self.run_hooks('modify_body_for_update', body, **kwargs) + _resp, body = self.api.client.put(url, body=body) + if body: + if response_key: + return self.resource_class(self, body[response_key]) + else: + return self.resource_class(self, body) + + +@six.add_metaclass(abc.ABCMeta) +class ManagerWithFind(Manager): + """Like a `Manager`, but with additional `find()`/`findall()` methods. + """ + + @abc.abstractmethod + def list(self): + pass + + def find(self, **kwargs): + """Find a single item with attributes matching ``**kwargs``. + + This isn't very efficient: it loads the entire list then filters on + the Python side. + """ + matches = self.findall(**kwargs) + num_matches = len(matches) + if num_matches == 0: + msg = "No %s matching %s." % (self.resource_class.__name__, kwargs) + raise exceptions.NotFound(404, msg) + elif num_matches > 1: + raise exceptions.NoUniqueMatch + else: + return matches[0] + + def findall(self, **kwargs): + """Find all items with attributes matching ``**kwargs``. + + This isn't very efficient: it loads the entire list then filters on + the Python side. + """ + found = [] + searches = kwargs.items() + + detailed = True + list_kwargs = {} + + list_argspec = inspect.getargspec(self.list) + if 'detailed' in list_argspec.args: + detailed = ("human_id" not in kwargs and + "name" not in kwargs and + "display_name" not in kwargs) + list_kwargs['detailed'] = detailed + + if 'is_public' in list_argspec.args and 'is_public' in kwargs: + is_public = kwargs['is_public'] + list_kwargs['is_public'] = is_public + if is_public is None: + tmp_kwargs = kwargs.copy() + del tmp_kwargs['is_public'] + searches = tmp_kwargs.items() + + listing = self.list(**list_kwargs) + + for obj in listing: + try: + if all(getattr(obj, attr) == value + for (attr, value) in searches): + if detailed: + found.append(obj) + else: + found.append(self.get(obj.id)) + except AttributeError: + continue + + return found + + +class BootingManagerWithFind(ManagerWithFind): + """Like a `ManagerWithFind`, but has the ability to boot servers.""" + + def _parse_block_device_mapping(self, block_device_mapping): + bdm = [] + + for device_name, mapping in six.iteritems(block_device_mapping): + # + # The mapping is in the format: + # <id>:[<type>]:[<size(GB)>]:[<delete_on_terminate>] + # + bdm_dict = {'device_name': device_name} + + mapping_parts = mapping.split(':') + source_id = mapping_parts[0] + if len(mapping_parts) == 1: + bdm_dict['volume_id'] = source_id + + elif len(mapping_parts) > 1: + source_type = mapping_parts[1] + if source_type.startswith('snap'): + bdm_dict['snapshot_id'] = source_id + else: + bdm_dict['volume_id'] = source_id + + if len(mapping_parts) > 2 and mapping_parts[2]: + bdm_dict['volume_size'] = str(int(mapping_parts[2])) + + if len(mapping_parts) > 3: + bdm_dict['delete_on_termination'] = mapping_parts[3] + + bdm.append(bdm_dict) + return bdm + + def _boot(self, resource_url, response_key, name, image, flavor, + meta=None, files=None, userdata=None, + reservation_id=None, return_raw=False, min_count=None, + max_count=None, security_groups=None, key_name=None, + availability_zone=None, block_device_mapping=None, + block_device_mapping_v2=None, nics=None, scheduler_hints=None, + config_drive=None, admin_pass=None, disk_config=None, **kwargs): + """Create (boot) a new server. + + :param name: Something to name the server. + :param image: The :class:`Image` to boot with. + :param flavor: The :class:`Flavor` to boot onto. + :param meta: A dict of arbitrary key/value metadata to store for this + server. A maximum of five entries is allowed, and both + keys and values must be 255 characters or less. + :param files: A dict of files to overwrite on the server upon boot. + Keys are file names (i.e. ``/etc/passwd``) and values + are the file contents (either as a string or as a + file-like object). A maximum of five entries is allowed, + and each file must be 10k or less. + :param reservation_id: a UUID for the set of servers being requested. + :param return_raw: If True, don't try to coearse the result into + a Resource object. + :param security_groups: list of security group names + :param key_name: (optional extension) name of keypair to inject into + the instance + :param availability_zone: Name of the availability zone for instance + placement. + :param block_device_mapping: A dict of block device mappings for this + server. + :param block_device_mapping_v2: A dict of block device mappings V2 for + this server. + :param nics: (optional extension) an ordered list of nics to be + added to this server, with information about + connected networks, fixed ips, etc. + :param scheduler_hints: (optional extension) arbitrary key-value pairs + specified by the client to help boot an instance. + :param config_drive: (optional extension) value for config drive + either boolean, or volume-id + :param admin_pass: admin password for the server. + :param disk_config: (optional extension) control how the disk is + partitioned when the server is created. + """ + body = {"server": { + "name": name, + "imageRef": str(getid(image)) if image else '', + "flavorRef": str(getid(flavor)), + }} + if userdata: + if hasattr(userdata, 'read'): + userdata = userdata.read() + + userdata = strutils.safe_encode(userdata) + body["server"]["user_data"] = base64.b64encode(userdata) + if meta: + body["server"]["metadata"] = meta + if reservation_id: + body["server"]["reservation_id"] = reservation_id + if key_name: + body["server"]["key_name"] = key_name + if scheduler_hints: + body['os:scheduler_hints'] = scheduler_hints + if config_drive: + body["server"]["config_drive"] = config_drive + if admin_pass: + body["server"]["adminPass"] = admin_pass + if not min_count: + min_count = 1 + if not max_count: + max_count = min_count + body["server"]["min_count"] = min_count + body["server"]["max_count"] = max_count + + if security_groups: + body["server"]["security_groups"] =\ + [{'name': sg} for sg in security_groups] + + # Files are a slight bit tricky. They're passed in a "personality" + # list to the POST. Each item is a dict giving a file name and the + # base64-encoded contents of the file. We want to allow passing + # either an open file *or* some contents as files here. + if files: + personality = body['server']['personality'] = [] + for filepath, file_or_string in sorted(files.items(), + key=lambda x: x[0]): + if hasattr(file_or_string, 'read'): + data = file_or_string.read() + else: + data = file_or_string + personality.append({ + 'path': filepath, + 'contents': base64.b64encode(data.encode('utf-8')), + }) + + if availability_zone: + body["server"]["availability_zone"] = availability_zone + + # Block device mappings are passed as a list of dictionaries + if block_device_mapping: + body['server']['block_device_mapping'] = \ + self._parse_block_device_mapping(block_device_mapping) + elif block_device_mapping_v2: + # Append the image to the list only if we have new style BDMs + if image: + bdm_dict = {'uuid': image.id, 'source_type': 'image', + 'destination_type': 'local', 'boot_index': 0, + 'delete_on_termination': True} + block_device_mapping_v2.insert(0, bdm_dict) + + body['server']['block_device_mapping_v2'] = block_device_mapping_v2 + + if nics is not None: + # NOTE(tr3buchet): nics can be an empty list + all_net_data = [] + for nic_info in nics: + net_data = {} + # if value is empty string, do not send value in body + if nic_info.get('net-id'): + net_data['uuid'] = nic_info['net-id'] + if nic_info.get('v4-fixed-ip'): + net_data['fixed_ip'] = nic_info['v4-fixed-ip'] + if nic_info.get('port-id'): + net_data['port'] = nic_info['port-id'] + all_net_data.append(net_data) + body['server']['networks'] = all_net_data + + if disk_config is not None: + body['server']['OS-DCF:diskConfig'] = disk_config + + return self._create(resource_url, body, response_key, + return_raw=return_raw, **kwargs) + + +class Resource(object): + """A resource represents a particular instance of an object (server, + flavor, etc). This is pretty much just a bag for attributes. + + :param manager: Manager object + :param info: dictionary representing resource attributes + :param loaded: prevent lazy-loading if set to True + """ + HUMAN_ID = False + NAME_ATTR = 'name' + + def __init__(self, manager, info, loaded=False): + self.manager = manager + self._info = info + self._add_details(info) + self._loaded = loaded + + # NOTE(sirp): ensure `id` is already present because if it isn't we'll + # enter an infinite loop of __getattr__ -> get -> __init__ -> + # __getattr__ -> ... + if 'id' in self.__dict__ and len(str(self.id)) == 36: + self.manager.write_to_completion_cache('uuid', self.id) + + human_id = self.human_id + if human_id: + self.manager.write_to_completion_cache('human_id', human_id) + + @property + def human_id(self): + """Subclasses may override this provide a pretty ID which can be used + for bash completion. + """ + if self.NAME_ATTR in self.__dict__ and self.HUMAN_ID: + return utils.slugify(getattr(self, self.NAME_ATTR)) + return None + + def _add_details(self, info): + for (k, v) in six.iteritems(info): + try: + setattr(self, k, v) + self._info[k] = v + except AttributeError: + # In this case we already defined the attribute on the class + pass + + def __getattr__(self, k): + if k not in self.__dict__: + #NOTE(bcwaldon): disallow lazy-loading if already loaded once + if not self.is_loaded(): + self.get() + return self.__getattr__(k) + + raise AttributeError(k) + else: + return self.__dict__[k] + + def __repr__(self): + reprkeys = sorted(k for k in self.__dict__.keys() + if k[0] != '_' and k != 'manager') + info = ", ".join("%s=%s" % (k, getattr(self, k)) for k in reprkeys) + return "<%s %s>" % (self.__class__.__name__, info) + + def get(self): + # set_loaded() first ... so if we have to bail, we know we tried. + self.set_loaded(True) + if not hasattr(self.manager, 'get'): + return + + new = self.manager.get(self.id) + if new: + self._add_details(new._info) + + def __eq__(self, other): + if not isinstance(other, self.__class__): + return False + if hasattr(self, 'id') and hasattr(other, 'id'): + return self.id == other.id + return self._info == other._info + + def is_loaded(self): + return self._loaded + + def set_loaded(self, val): + self._loaded = val |