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# Copyright (c) 2013 Red Hat, Inc.
#
# 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.
import functools
from zaqarclient import errors
def version(min_version, max_version=None):
min_version = float(min_version)
max_version = max_version and float(max_version)
error_msg = ('Method %(name)s is supported from version %(min)s '
'to %(max)s')
def method(meth):
@functools.wraps(meth)
def wrapper(self, *args, **kwargs):
if (self.api_version < min_version or
(max_version and self.api_version > max_version)):
msg = error_msg % dict(name=str(meth),
min=min_version,
max=max_version or 'latest')
raise errors.UnsupportedVersion(msg)
return meth(self, *args, **kwargs)
return wrapper
return method
def lazy_property(write=False, delete=True):
"""Creates a lazy property.
:param write: Whether this property is "writable"
:param delete: Whether this property can be deleted.
"""
def wrapper(fn):
attr_name = '_lazy_' + fn.__name__
def getter(self):
if not hasattr(self, attr_name):
setattr(self, attr_name, fn(self))
return getattr(self, attr_name)
def setter(self, value):
setattr(self, attr_name, value)
def deleter(self):
delattr(self, attr_name)
return property(fget=getter,
fset=write and setter,
fdel=delete and deleter,
doc=fn.__doc__)
return wrapper
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