/
resource.py
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/
resource.py
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# coding=utf-8
# Copyright (c) 2015 EMC Corporation.
# 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.
from __future__ import unicode_literals
from datetime import datetime, timedelta
import storops.exception as ex
import storops.lib.parser
from storops.lib.common import JsonPrinter
__author__ = 'Cedric Zhuang'
class Resource(JsonPrinter):
def __init__(self):
self._property_cache = {}
self._parsed_resource = None
super(Resource, self).__init__()
@staticmethod
def _get(data, key):
if isinstance(key, storops.lib.parser.PropDescriptor):
key = key.key
try:
ret = data.__getitem__(key)
except KeyError:
ret = None
return ret
@staticmethod
def _has_get(data):
return hasattr(data, '__getitem__')
def _get_name(self):
if hasattr(self, '_name') and self._name is not None:
name = self._name
else:
name = self.name
return name
@classmethod
def _get_parser(cls):
raise NotImplementedError('_get_parser not implemented.')
@property
def parsed_resource(self):
return self._parsed_resource
def update(self, data=None):
if data is None:
data = self._get_raw_resource()
self._parsed_resource = self._parse_raw(data)
return self
def get_index(self):
parser = self._get_parser()
index_desc = parser.index_property
if index_desc is not None:
ret = getattr(self, index_desc.key)
else:
raise ex.NoIndexException('{} does not have index.'
.format(self.__class__.__name__))
return ret
@property
def existed(self):
try:
ret = self.get_index() is not None
except ex.NoIndexException:
# no index, check if any of the property is available
prop = self._get_first_not_none_prop()
ret = prop is not None
return ret
def _get_first_not_none_prop(self):
ret = None
prop_desc_list = self._get_parser().properties
for prop_desc in prop_desc_list:
ret = getattr(self, prop_desc.key)
if ret is not None:
break
return ret
def is_valid(self):
return self.existed()
def _get_parsed_resource(self):
return self._get_raw_resource()
def _parse_raw(self, data):
return self._get_parser().parse(data)
@classmethod
def parse(cls, output):
obj = cls()
data = cls._get_parser().parse_single(output)
return obj.update(data)
@classmethod
def parse_all(cls, output):
ret = []
for data in cls._get_parser().parse_all(output):
obj = cls()
ret.append(obj.update(data))
return ret
def property_names(self):
parser = self._get_parser()
if parser is not None:
ret = parser.property_names
else:
ret = []
return ret
@classmethod
def get_property_label(cls, key):
parser = cls._get_parser()
if parser is not None:
ret = parser.get_property_label(key)
else:
ret = None
return ret
@classmethod
def get_property_key(cls, label):
parser = cls._get_parser()
if parser is not None:
ret = parser.get_property_key(label)
else:
ret = None
return ret
def _get_properties(self, dec=0):
props = {'hash': self.__hash__()}
if dec >= 0:
prop_names = list(self.property_names())
prop_names.append('existed')
for name in prop_names:
try:
value = getattr(self, name)
if isinstance(value, JsonPrinter):
value = value.get_dict_repr(dec - 1)
elif isinstance(value, (datetime, timedelta)):
value = str(value)
elif isinstance(value, (tuple, list, set)):
value = [v.get_dict_repr(dec - 1)
if isinstance(v, JsonPrinter) else v
for v in value]
props[name] = value
except AttributeError:
# skip not available attributes
continue
return props
@property
def _cache_size(self):
return len(self._property_cache)
def _get_raw_resource(self):
"""get raw input of this resource
Get the raw input of this resource.
The input could be retrieved from multiple interface like
CLI or CIM."""
return ''
def __getattr__(self, item):
if item in self._property_cache:
ret = self._property_cache[item]
elif not item.startswith('_'):
ret = self._get_property_from_raw(item)
else:
raise AttributeError(item)
return ret
def _update_property_cache(self, name, value):
self._property_cache[name] = value
def _is_updated(self):
return self._parsed_resource is not None
def _get_property_from_raw(self, item):
if not self._is_updated():
self.update()
if item in self.property_names():
ret = self._get_value_by_key(item)
else:
raise AttributeError(
"'{}' does not contain attribute '{}'".format(
self.__class__.__name__, item))
return ret
def _get_value_by_key(self, item):
return self._parsed_resource.get(item, None)
class ResourceList(Resource):
def __init__(self):
super(ResourceList, self).__init__()
self._list = None
self._iter = None
def update(self, data=None):
self._list = []
if data is None:
data = self._get_raw_resource()
if data is not None and isinstance(data, dict):
parsed_list = data
else:
parsed_list = self._parse_raw(data)
for i in parsed_list:
item = self.get_resource_class()()
item.update(i)
if self._filter(item):
self._list.append(item)
return self
def _apply_filter(self):
result = []
for item in self:
if self._filter(item):
result.append(item)
self._list = result
def _filter(self, _):
return True
def _parse_raw(self, data):
return self._get_parser().parse_all(data)
@classmethod
def _get_parser(cls):
raise NotImplementedError('_get_parser not implemented.')
@property
def list(self):
if self._list is None:
self.update()
return self._list
@classmethod
def get_resource_class(cls):
raise NotImplementedError(
'should return the class ref of the resource in the list.')
def get_dict_repr(self, dec=1):
items = [item.get_dict_repr(dec - 1) for item in self.list]
return {self.__class__.__name__: items}
def __len__(self):
return len(self.list)
def __iter__(self):
self._iter = self.list.__iter__()
return self
def next(self):
return next(self._iter)
def __next__(self):
return self.next()
def __getitem__(self, item):
return self.list[item]
def __getattr__(self, v):
clz = self.get_resource_class()
s = clz()
ret = None
if not v.startswith('_'):
if v in dir(s):
ret = self.get_member_attr_list(v)
elif hasattr(s, 'property_names') and v in s.property_names():
ret = self.get_member_attr_list(v)
if ret is None:
raise AttributeError(
'{} do not has attribute {}.'.format(clz.__name__, v))
return ret
def get_member_attr_list(self, v):
return [getattr(i, v) for i in self]
def _is_updated(self):
return self._list is not None