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#
# 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 re
from masakariclient.common import exception
from masakariclient.common.i18n import _
_type_error_msg = _("'%(other)s' should be an instance of '%(cls)s'")
class APIVersion(object):
"""This class represents an API Version Request.
This class provides convenience methods for manipulation
and comparison of version numbers that we need to do to
implement microversions.
"""
def __init__(self, version_str=None):
"""Create an API version object.
:param version_str: String representation of APIVersionRequest.
Correct format is 'X.Y', where 'X' and 'Y'
are int values. None value should be used
to create Null APIVersionRequest, which is
equal to 0.0
"""
self.ver_major = 0
self.ver_minor = 0
if version_str is not None:
match = re.match(r"^([1-9]\d*)\.([1-9]\d*|0|latest)$", version_str)
if match:
self.ver_major = int(match.group(1))
if match.group(2) == "latest":
# Infinity allows to easily determine latest version and
# doesn't require any additional checks in comparison
# methods.
self.ver_minor = float("inf")
else:
self.ver_minor = int(match.group(2))
else:
msg = _("Invalid format of client version '%s'. "
"Expected format 'X.Y', where X is a major part and Y "
"is a minor part of version.") % version_str
raise exception.UnsupportedVersion(msg)
def __str__(self):
"""Debug/Logging representation of object."""
if self.is_latest():
return "Latest API Version Major: %s" % self.ver_major
return ("API Version Major: %s, Minor: %s"
% (self.ver_major, self.ver_minor))
def __repr__(self):
if self.is_null():
return "<APIVersion: null>"
else:
return "<APIVersion: %s>" % self.get_string()
def is_null(self):
return self.ver_major == 0 and self.ver_minor == 0
def is_latest(self):
return self.ver_minor == float("inf")
def __lt__(self, other):
if not isinstance(other, APIVersion):
raise TypeError(_type_error_msg % {"other": other,
"cls": self.__class__})
return ((self.ver_major, self.ver_minor) <
(other.ver_major, other.ver_minor))
def __eq__(self, other):
if not isinstance(other, APIVersion):
raise TypeError(_type_error_msg % {"other": other,
"cls": self.__class__})
return ((self.ver_major, self.ver_minor) ==
(other.ver_major, other.ver_minor))
def __gt__(self, other):
if not isinstance(other, APIVersion):
raise TypeError(_type_error_msg % {"other": other,
"cls": self.__class__})
return ((self.ver_major, self.ver_minor) >
(other.ver_major, other.ver_minor))
def __le__(self, other):
return self < other or self == other
def __ne__(self, other):
return not self.__eq__(other)
def __ge__(self, other):
return self > other or self == other
def matches(self, min_version, max_version):
"""Matches the version object.
Returns whether the version object represents a version
greater than or equal to the minimum version and less than
or equal to the maximum version.
:param min_version: Minimum acceptable version.
:param max_version: Maximum acceptable version.
:returns: boolean
If min_version is null then there is no minimum limit.
If max_version is null then there is no maximum limit.
If self is null then raise ValueError
"""
if self.is_null():
raise ValueError(_("Null APIVersion doesn't support 'matches'."))
if max_version.is_null() and min_version.is_null():
return True
elif max_version.is_null():
return min_version <= self
elif min_version.is_null():
return self <= max_version
else:
return min_version <= self <= max_version
def get_string(self):
"""Version string representation.
Converts object to string representation which if used to create
an APIVersion object results in the same version.
"""
if self.is_null():
raise ValueError(
_("Null APIVersion cannot be converted to string."))
elif self.is_latest():
return "%s.%s" % (self.ver_major, "latest")
return "%s.%s" % (self.ver_major, self.ver_minor)
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