OpenStack Compute (Nova)
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nova/nova/api/openstack/api_version_request.py

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# Copyright 2014 IBM Corp.
#
# 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 nova import exception
# Define the minimum and maximum version of the API across all of the
# REST API. The format of the version is:
# X.Y where:
#
# - X will only be changed if a significant backwards incompatible API
# change is made which affects the API as whole. That is, something
# that is only very very rarely incremented.
#
# - Y when you make any change to the API. Note that this includes
# semantic changes which may not affect the input or output formats or
# even originate in the API code layer. We are not distinguishing
# between backwards compatible and backwards incompatible changes in
# the versioning system. It must be made clear in the documentation as
# to what is a backwards compatible change and what is a backwards
# incompatible one.
#
# You must update the API version history string below with a one or
# two line description as well as update rest_api_version_history.rst
REST_API_VERSION_HISTORY = """REST API Version History:
* 2.1 - Initial version. Equivalent to v2.0 code
* 2.2 - Adds (keypair) type parameter for os-keypairs plugin
Fixes success status code for create/delete a keypair method
* 2.3 - Exposes additional os-extended-server-attributes
Exposes delete_on_termination for os-extended-volumes
* 2.4 - Exposes reserved field in os-fixed-ips.
* 2.5 - Allow server search option ip6 for non-admin
* 2.6 - Consolidate the APIs for getting remote consoles
* 2.7 - Check flavor type before add tenant access.
"""
# The minimum and maximum versions of the API supported
# The default api version request is definied to be the
# the minimum version of the API supported.
# Note(cyeoh): This only applies for the v2.1 API once microversions
# support is fully merged. It does not affect the V2 API.
_MIN_API_VERSION = "2.1"
_MAX_API_VERSION = "2.7"
DEFAULT_API_VERSION = _MIN_API_VERSION
# NOTE(cyeoh): min and max versions declared as functions so we can
# mock them for unittests. Do not use the constants directly anywhere
# else.
def min_api_version():
return APIVersionRequest(_MIN_API_VERSION)
def max_api_version():
return APIVersionRequest(_MAX_API_VERSION)
class APIVersionRequest(object):
"""This class represents an API Version Request with convenience
methods for manipulation and comparison of version
numbers that we need to do to implement microversions.
"""
def __init__(self, version_string=None):
"""Create an API version request object."""
self.ver_major = None
self.ver_minor = None
if version_string is not None:
match = re.match(r"^([1-9]\d*)\.([1-9]\d*|0)$",
version_string)
if match:
self.ver_major = int(match.group(1))
self.ver_minor = int(match.group(2))
else:
raise exception.InvalidAPIVersionString(version=version_string)
def __str__(self):
"""Debug/Logging representation of object."""
return ("API Version Request Major: %s, Minor: %s"
% (self.ver_major, self.ver_minor))
def is_null(self):
return self.ver_major is None and self.ver_minor is None
def __cmp__(self, other):
if not isinstance(other, APIVersionRequest):
raise TypeError
return cmp((self.ver_major, self.ver_minor),
(other.ver_major, other.ver_minor))
def matches(self, min_version, max_version):
"""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
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):
"""Converts object to string representation which if used to create
an APIVersionRequest object results in the same version request.
"""
if self.is_null():
raise ValueError
return "%s.%s" % (self.ver_major, self.ver_minor)