367 lines
14 KiB
Python
367 lines
14 KiB
Python
#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import functools
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import logging
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import os
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import pkgutil
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import re
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from oslo_utils import strutils
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import cinderclient
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from cinderclient import exceptions
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from cinderclient import utils
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from cinderclient._i18n import _
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logging.basicConfig()
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LOG = logging.getLogger(__name__)
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if not LOG.handlers:
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LOG.addHandler(logging.StreamHandler())
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# key is a deprecated version and value is an alternative version.
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DEPRECATED_VERSIONS = {"1": "2"}
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MAX_VERSION = "3.1"
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_SUBSTITUTIONS = {}
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_type_error_msg = "'%(other)s' should be an instance of '%(cls)s'"
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class APIVersion(object):
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"""This class represents an API Version with convenience
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methods for manipulation and comparison of version
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numbers that we need to do to implement microversions.
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"""
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def __init__(self, version_str=None):
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"""Create an API version object."""
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self.ver_major = 0
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self.ver_minor = 0
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if version_str is not None:
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match = re.match(r"^([1-9]\d*)\.([1-9]\d*|0|latest)$", version_str)
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if match:
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self.ver_major = int(match.group(1))
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if match.group(2) == "latest":
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# NOTE(andreykurilin): Infinity allows to easily determine
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# latest version and doesn't require any additional checks
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# in comparison methods.
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self.ver_minor = float("inf")
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else:
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self.ver_minor = int(match.group(2))
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else:
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msg = (_("Invalid format of client version '%s'. "
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"Expected format 'X.Y', where X is a major part and Y "
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"is a minor part of version.") % version_str)
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raise exceptions.UnsupportedVersion(msg)
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def __str__(self):
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"""Debug/Logging representation of object."""
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if self.is_latest():
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return "Latest API Version Major: %s" % self.ver_major
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return ("API Version Major: %s, Minor: %s"
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% (self.ver_major, self.ver_minor))
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def __repr__(self):
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if self.is_null():
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return "<APIVersion: null>"
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else:
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return "<APIVersion: %s>" % self.get_string()
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def is_null(self):
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return self.ver_major == 0 and self.ver_minor == 0
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def is_latest(self):
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return self.ver_minor == float("inf")
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def __lt__(self, other):
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if not isinstance(other, APIVersion):
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raise TypeError(_type_error_msg % {"other": other,
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"cls": self.__class__})
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return ((self.ver_major, self.ver_minor) <
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(other.ver_major, other.ver_minor))
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def __eq__(self, other):
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if not isinstance(other, APIVersion):
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raise TypeError(_type_error_msg % {"other": other,
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"cls": self.__class__})
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return ((self.ver_major, self.ver_minor) ==
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(other.ver_major, other.ver_minor))
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def __gt__(self, other):
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if not isinstance(other, APIVersion):
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raise TypeError(_type_error_msg % {"other": other,
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"cls": self.__class__})
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return ((self.ver_major, self.ver_minor) >
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(other.ver_major, other.ver_minor))
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def __le__(self, other):
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return self < other or self == other
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def __ne__(self, other):
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return not self.__eq__(other)
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def __ge__(self, other):
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return self > other or self == other
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def matches(self, min_version, max_version=None):
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"""Returns whether the version object represents a version
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greater than or equal to the minimum version and less than
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or equal to the maximum version.
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:param min_version: Minimum acceptable version.
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:param max_version: Maximum acceptable version.
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:returns: boolean
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If min_version is null then there is no minimum limit.
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If max_version is null then there is no maximum limit.
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If self is null then raise ValueError
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"""
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if self.is_null():
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raise ValueError("Null APIVersion doesn't support 'matches'.")
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if isinstance(min_version, str):
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min_version = APIVersion(version_str=min_version)
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if isinstance(max_version, str):
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max_version = APIVersion(version_str=max_version)
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if not min_version and not max_version:
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return True
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elif ((min_version and max_version) and
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max_version.is_null() and min_version.is_null()):
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return True
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elif not max_version or max_version.is_null():
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return min_version <= self
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elif not min_version or min_version.is_null():
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return self <= max_version
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else:
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return min_version <= self <= max_version
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def get_string(self):
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"""Converts object to string representation which if used to create
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an APIVersion object results in the same version.
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"""
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if self.is_null():
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raise ValueError("Null APIVersion cannot be converted to string.")
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elif self.is_latest():
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return "%s.%s" % (self.ver_major, "latest")
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return "%s.%s" % (self.ver_major, self.ver_minor)
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class VersionedMethod(object):
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def __init__(self, name, start_version, end_version, func):
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"""Versioning information for a single method
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:param name: Name of the method
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:param start_version: Minimum acceptable version
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:param end_version: Maximum acceptable_version
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:param func: Method to call
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Minimum and maximums are inclusive
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"""
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self.name = name
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self.start_version = start_version
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self.end_version = end_version
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self.func = func
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def __str__(self):
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return ("Version Method %s: min: %s, max: %s"
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% (self.name, self.start_version, self.end_version))
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def __repr__(self):
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return "<VersionedMethod %s>" % self.name
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def get_available_major_versions():
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# NOTE(andreykurilin): available clients version should not be
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# hardcoded, so let's discover them.
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matcher = re.compile(r"v[0-9]*$")
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submodules = pkgutil.iter_modules([os.path.dirname(__file__)])
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available_versions = [name[1:] for loader, name, ispkg in submodules
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if matcher.search(name)]
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return available_versions
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def check_major_version(api_version):
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"""Checks major part of ``APIVersion`` obj is supported.
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:raises cinderclient.exceptions.UnsupportedVersion: if major part is not
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supported
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"""
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available_versions = get_available_major_versions()
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if (not api_version.is_null() and
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str(api_version.ver_major) not in available_versions):
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if len(available_versions) == 1:
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msg = ("Invalid client version '%(version)s'. "
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"Major part should be '%(major)s'") % {
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"version": api_version.get_string(),
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"major": available_versions[0]}
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else:
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msg = ("Invalid client version '%(version)s'. "
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"Major part must be one of: '%(major)s'") % {
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"version": api_version.get_string(),
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"major": ", ".join(available_versions)}
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raise exceptions.UnsupportedVersion(msg)
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def get_api_version(version_string):
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"""Returns checked APIVersion object"""
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version_string = str(version_string)
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if version_string in DEPRECATED_VERSIONS:
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LOG.warning("Version %(deprecated_version)s is deprecated, use "
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"alternative version %(alternative)s instead.",
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{"deprecated_version": version_string,
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"alternative": DEPRECATED_VERSIONS[version_string]})
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if strutils.is_int_like(version_string):
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version_string = "%s.0" % version_string
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api_version = APIVersion(version_string)
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check_major_version(api_version)
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return api_version
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def _get_server_version_range(client):
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version = client.versions.get_current()
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if not hasattr(version, 'version') or not version.version:
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return APIVersion(), APIVersion()
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return APIVersion(version.min_version), APIVersion(version.version)
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def discover_version(client, requested_version):
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"""Checks ``requested_version`` and returns the most recent version
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supported by both the API and the client.
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:param client: client object
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:param requested_version: requested version represented by APIVersion obj
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:returns: APIVersion
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"""
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server_start_version, server_end_version = _get_server_version_range(
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client)
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if (not requested_version.is_latest() and
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requested_version != APIVersion('2.0')):
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if server_start_version.is_null() and server_end_version.is_null():
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raise exceptions.UnsupportedVersion(
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_("Server doesn't support microversions"))
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if not requested_version.matches(server_start_version,
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server_end_version):
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raise exceptions.UnsupportedVersion(
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_("The specified version isn't supported by server. The valid "
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"version range is '%(min)s' to '%(max)s'") % {
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"min": server_start_version.get_string(),
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"max": server_end_version.get_string()})
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return requested_version
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if requested_version == APIVersion('2.0'):
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if (server_start_version == APIVersion('2.1') or
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(server_start_version.is_null() and
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server_end_version.is_null())):
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return APIVersion('2.0')
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else:
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raise exceptions.UnsupportedVersion(
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_("The server isn't backward compatible with Cinder V2 REST "
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"API"))
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if server_start_version.is_null() and server_end_version.is_null():
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return APIVersion('2.0')
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elif cinderclient.API_MIN_VERSION > server_end_version:
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raise exceptions.UnsupportedVersion(
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_("Server version is too old. The client valid version range is "
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"'%(client_min)s' to '%(client_max)s'. The server valid version "
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"range is '%(server_min)s' to '%(server_max)s'.") % {
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'client_min': cinderclient.API_MIN_VERSION.get_string(),
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'client_max': cinderclient.API_MAX_VERSION.get_string(),
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'server_min': server_start_version.get_string(),
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'server_max': server_end_version.get_string()})
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elif cinderclient.API_MAX_VERSION < server_start_version:
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raise exceptions.UnsupportedVersion(
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_("Server version is too new. The client valid version range is "
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"'%(client_min)s' to '%(client_max)s'. The server valid version "
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"range is '%(server_min)s' to '%(server_max)s'.") % {
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'client_min': cinderclient.API_MIN_VERSION.get_string(),
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'client_max': cinderclient.API_MAX_VERSION.get_string(),
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'server_min': server_start_version.get_string(),
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'server_max': server_end_version.get_string()})
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elif cinderclient.API_MAX_VERSION <= server_end_version:
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return cinderclient.API_MAX_VERSION
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elif server_end_version < cinderclient.API_MAX_VERSION:
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return server_end_version
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def update_headers(headers, api_version):
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"""Set 'OpenStack-API-Version' header if api_version is not
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null
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"""
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if not api_version.is_null() and api_version.ver_minor != 0:
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headers["OpenStack-API-Version"] = "volume " + api_version.get_string()
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def add_substitution(versioned_method):
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_SUBSTITUTIONS.setdefault(versioned_method.name, [])
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_SUBSTITUTIONS[versioned_method.name].append(versioned_method)
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def get_substitutions(func_name, api_version=None):
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substitutions = _SUBSTITUTIONS.get(func_name, [])
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if api_version and not api_version.is_null():
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return [m for m in substitutions
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if api_version.matches(m.start_version, m.end_version)]
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return substitutions
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def wraps(start_version, end_version=None):
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start_version = APIVersion(start_version)
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if end_version:
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end_version = APIVersion(end_version)
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else:
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end_version = APIVersion("%s.latest" % start_version.ver_major)
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def decor(func):
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func.versioned = True
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name = utils.get_function_name(func)
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versioned_method = VersionedMethod(name, start_version,
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end_version, func)
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add_substitution(versioned_method)
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@functools.wraps(func)
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def substitution(obj, *args, **kwargs):
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methods = get_substitutions(name, obj.api_version)
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if not methods:
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raise exceptions.VersionNotFoundForAPIMethod(
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obj.api_version.get_string(), name)
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method = max(methods, key=lambda f: f.start_version)
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return method.func(obj, *args, **kwargs)
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if hasattr(func, 'arguments'):
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for cli_args, cli_kwargs in func.arguments:
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utils.add_arg(substitution, *cli_args, **cli_kwargs)
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return substitution
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return decor
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