537 lines
16 KiB
Python
537 lines
16 KiB
Python
# 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 collections
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import numbers
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from oslo_log import log as logging
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from oslo_serialization import jsonutils
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from oslo_utils import strutils
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from senlin.common import exception as exc
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from senlin.common.i18n import _
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LOG = logging.getLogger(__name__)
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class AnyIndexDict(collections.abc.Mapping):
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"""Convenience schema for a list."""
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def __init__(self, value):
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self.value = value
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def __getitem__(self, key):
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if key != '*' and not isinstance(key, int):
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raise KeyError("Invalid key %s" % str(key))
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return self.value
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def __iter__(self):
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yield '*'
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def __len__(self):
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return 1
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class SchemaBase(collections.abc.Mapping):
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"""Class for validating property or operation schemas."""
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KEYS = (
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TYPE, DESCRIPTION, DEFAULT, REQUIRED, SCHEMA, CONSTRAINTS,
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MIN_VERSION, MAX_VERSION,
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) = (
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'type', 'description', 'default', 'required', 'schema', 'constraints',
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'min_version', 'max_version',
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)
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TYPES = (
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INTEGER, STRING, NUMBER, BOOLEAN, MAP, LIST,
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) = (
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'Integer', 'String', 'Number', 'Boolean', 'Map', 'List',
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)
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def __init__(self, description=None, default=None, required=False,
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schema=None, constraints=None, min_version=None,
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max_version=None):
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if schema is not None:
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if type(self) not in (List, Map, Operation):
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msg = _('Schema valid only for List or Map, not %s'
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) % self[self.TYPE]
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raise exc.ESchema(message=msg)
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if self[self.TYPE] == self.LIST:
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self.schema = AnyIndexDict(schema)
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else:
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self.schema = schema
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self.description = description
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self.default = default
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self.required = required
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self.constraints = constraints or []
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self._len = None
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self.min_version = min_version
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self.max_version = max_version
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def has_default(self):
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return self.default is not None
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def get_default(self):
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return self.resolve(self.default)
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def _validate_default(self, context):
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if self.default is None:
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return
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try:
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# NOTE: this is the subclass's version of 'validate'
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self.validate(self.default, context)
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except (ValueError, TypeError) as ex:
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msg = _('Invalid default %(default)s: %(exc)s'
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) % dict(default=self.default, exc=ex)
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raise exc.ESchema(message=msg)
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def validate_constraints(self, value, schema=None, context=None):
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try:
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for constraint in self.constraints:
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constraint.validate(value, schema=schema, context=context)
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except ValueError as ex:
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raise exc.ESchema(message=str(ex))
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def _validate_version(self, key, version):
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if self.min_version and self.min_version > version:
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msg = _('%(key)s (min_version=%(min)s) is not supported by '
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'spec version %(version)s.'
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) % {'key': key, 'min': self.min_version,
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'version': version}
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raise exc.ESchema(message=msg)
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if self.max_version:
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if version > self.max_version:
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msg = _('%(key)s (max_version=%(max)s) is not supported '
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'by spec version %(version)s.'
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) % {'version': version, 'max': self.max_version,
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'key': key}
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raise exc.ESchema(message=msg)
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else:
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LOG.warning('Warning: %(key)s will be deprecated after '
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'version %(version)s!',
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{'key': key, 'version': self.max_version})
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def __getitem__(self, key):
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if key == self.DESCRIPTION:
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if self.description is not None:
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return self.description
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elif key == self.DEFAULT:
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if self.default is not None:
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return self.default
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elif key == self.SCHEMA:
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if self.schema is not None:
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return dict((n, dict(s)) for n, s in self.schema.items())
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elif key == self.REQUIRED:
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return self.required
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elif key == self.CONSTRAINTS:
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if self.constraints:
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return [dict(c) for c in self.constraints]
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raise KeyError(key)
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def __iter__(self):
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for k in self.KEYS:
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try:
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self[k]
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except KeyError:
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pass
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else:
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yield k
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def __len__(self):
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if self._len is None:
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self._len = len(list(iter(self)))
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return self._len
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class PropertySchema(SchemaBase):
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"""Class for validating profile and policy specifications."""
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KEYS = (
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TYPE, DESCRIPTION, DEFAULT, REQUIRED, SCHEMA, UPDATABLE,
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CONSTRAINTS, MIN_VERSION, MAX_VERSION,
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) = (
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'type', 'description', 'default', 'required', 'schema', 'updatable',
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'constraints', 'min_version', 'max_version',
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)
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def __init__(self, description=None, default=None, required=False,
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schema=None, updatable=False, constraints=None,
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min_version=None, max_version=None):
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super(PropertySchema, self).__init__(description=description,
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default=default,
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required=required, schema=schema,
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constraints=constraints,
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min_version=min_version,
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max_version=max_version)
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self.updatable = updatable
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def __getitem__(self, key):
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# NOTE: UPDATABLE is only applicable to some specs which may be
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# eligible for an update operation later
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if key == self.UPDATABLE:
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return self.updatable
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return super(PropertySchema, self).__getitem__(key)
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class Boolean(PropertySchema):
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def __getitem__(self, key):
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if key == self.TYPE:
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return self.BOOLEAN
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return super(Boolean, self).__getitem__(key)
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def to_schema_type(self, value):
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try:
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return strutils.bool_from_string(str(value), strict=True)
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except ValueError:
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msg = _("The value '%s' is not a valid Boolean") % value
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raise exc.ESchema(message=msg)
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def resolve(self, value):
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return self.to_schema_type(value)
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def validate(self, value, context=None):
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if isinstance(value, bool):
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return
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self.resolve(value)
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class Integer(PropertySchema):
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def __getitem__(self, key):
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if key == self.TYPE:
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return self.INTEGER
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return super(Integer, self).__getitem__(key)
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def to_schema_type(self, value):
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if value is None:
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return None
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if isinstance(value, int):
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return value
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try:
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num = int(value)
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except ValueError:
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msg = _("The value '%s' is not a valid Integer") % value
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raise exc.ESchema(message=msg)
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return num
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def resolve(self, value):
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return self.to_schema_type(value)
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def validate(self, value, context=None):
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if not isinstance(value, int):
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value = self.resolve(value)
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self.validate_constraints(value, schema=self, context=context)
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class String(PropertySchema):
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def __getitem__(self, key):
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if key == self.TYPE:
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return self.STRING
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return super(String, self).__getitem__(key)
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def to_schema_type(self, value):
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try:
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if isinstance(value, str):
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return value
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return str(value) if value is not None else None
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except Exception:
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raise
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def resolve(self, value):
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return self.to_schema_type(value)
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def validate(self, value, context=None):
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if value is None:
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msg = _("The value '%s' is not a valid string.") % value
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raise exc.ESchema(message=msg)
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self.resolve(value)
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self.validate_constraints(value, schema=self, context=context)
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class Number(PropertySchema):
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def __getitem__(self, key):
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if key == self.TYPE:
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return self.NUMBER
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return super(Number, self).__getitem__(key)
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def to_schema_type(self, value):
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if isinstance(value, numbers.Number):
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return value
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try:
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return int(value)
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except ValueError:
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try:
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return float(value)
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except ValueError:
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msg = _("The value '%s' is not a valid number.") % value
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raise exc.ESchema(message=msg)
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def resolve(self, value):
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return self.to_schema_type(value)
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def validate(self, value, context=None):
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if not isinstance(value, numbers.Number):
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value = self.resolve(value)
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self.validate_constraints(value, schema=self, context=context)
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class List(PropertySchema):
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def __getitem__(self, key):
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if key == self.TYPE:
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return self.LIST
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return super(List, self).__getitem__(key)
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def _get_children(self, values, context=None):
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res = []
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for i in range(len(values)):
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res.append(self.schema[i].resolve(values[i]))
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return res
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def resolve(self, value, context=None):
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if not isinstance(value, collections.abc.Sequence):
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raise TypeError(_('"%s" is not a List') % value)
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return [v for v in self._get_children(value, context=context)]
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def validate(self, value, context=None):
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# if not isinstance(value, collections.abc.Mapping):
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if not isinstance(value, collections.abc.Sequence):
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msg = _("'%s' is not a List") % value
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raise exc.ESchema(message=msg)
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for v in value:
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self.schema['*'].validate(v, context=context)
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class Map(PropertySchema):
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def __getitem__(self, key):
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if key == self.TYPE:
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return self.MAP
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return super(Map, self).__getitem__(key)
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def _get_children(self, values, context=None):
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# There are cases where the Map is not specified to the very
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# detailed levels, we treat them as valid specs as well.
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if self.schema is None:
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return values
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sub_schema = self.schema
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if sub_schema is not None:
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# sub_schema should be a dict here.
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subspec = Spec(sub_schema, dict(values))
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subspec.validate()
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return ((k, subspec[k]) for k in sub_schema)
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else:
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return values
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def get_default(self):
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if self.default is None:
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return {}
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if not isinstance(self.default, collections.abc.Mapping):
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msg = _("'%s' is not a Map") % self.default
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raise exc.ESchema(message=msg)
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return self.default
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def resolve(self, value, context=None):
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if isinstance(value, str):
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try:
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value = jsonutils.loads(value)
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except (TypeError, ValueError):
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msg = _("'%s' is not a Map") % value
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raise exc.ESchema(message=msg)
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if not isinstance(value, collections.abc.Mapping):
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msg = _("'%s' is not a Map") % value
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raise exc.ESchema(message=msg)
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return dict(self._get_children(value.items(), context))
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def validate(self, value, context=None):
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if not isinstance(value, collections.abc.Mapping):
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msg = _("'%s' is not a Map") % value
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raise exc.ESchema(message=msg)
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if not self.schema:
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return
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for key, child in self.schema.items():
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item_value = value.get(key)
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if item_value:
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child.validate(item_value, context)
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class StringParam(SchemaBase):
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def __getitem__(self, key):
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if key == self.TYPE:
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return self.STRING
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return super(StringParam, self).__getitem__(key)
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def validate(self, value):
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if not isinstance(value, str):
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raise TypeError("value is not a string")
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self.validate_constraints(value)
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class IntegerParam(SchemaBase):
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def __getitem__(self, key):
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if key == self.TYPE:
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return self.INTEGER
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return super(IntegerParam, self).__getitem__(key)
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def validate(self, value):
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try:
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int(value)
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except ValueError:
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msg = _("The value '%s' is not a valid Integer") % value
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raise ValueError(msg)
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self.validate_constraints(value)
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class Operation(SchemaBase):
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"""Class for specifying operations on profiles."""
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KEYS = (
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DESCRIPTION, PARAMETERS,
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) = (
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'description', 'parameters',
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)
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def __getitem__(self, key):
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if key == self.DESCRIPTION:
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return self.description or "Undocumented"
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elif key == self.PARAMETERS:
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if self.schema is None:
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return {}
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return dict((n, dict(s)) for n, s in self.schema.items())
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def validate(self, data, version=None):
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for k in data:
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if k not in self.schema:
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msg = _("Unrecognizable parameter '%s'") % k
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raise exc.ESchema(message=msg)
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for (k, s) in self.schema.items():
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try:
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if k in data:
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s.validate(data[k])
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elif s.required:
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msg = _("Required parameter '%s' not provided") % k
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raise exc.ESchema(message=msg)
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if version:
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s._validate_version(k, version)
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except (TypeError, ValueError) as ex:
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raise exc.ESchema(message=str(ex))
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class Spec(collections.abc.Mapping):
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"""A class that contains all spec items."""
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def __init__(self, schema, data, version=None):
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self._schema = schema
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self._data = data
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self._version = version
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def validate(self):
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"""Validate the schema."""
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for (k, s) in self._schema.items():
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try:
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# Validate through resolve
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self.resolve_value(k)
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# Validate schema for version
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if self._version:
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self._schema[k]._validate_version(k, self._version)
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except (TypeError, ValueError) as err:
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raise exc.ESchema(message=str(err))
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for key in self._data:
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if key not in self._schema:
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msg = _("Unrecognizable spec item '%s'") % key
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raise exc.ESchema(message=msg)
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def resolve_value(self, key):
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if key not in self:
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raise exc.ESchema(message="Invalid spec item: %s" % key)
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schema_item = self._schema[key]
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if key in self._data:
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raw_value = self._data[key]
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schema_item.validate(raw_value)
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return schema_item.resolve(raw_value)
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elif schema_item.has_default():
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return schema_item.get_default()
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elif schema_item.required:
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msg = _("Required spec item '%s' not provided") % key
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raise exc.ESchema(message=msg)
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def __getitem__(self, key):
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"""Lazy evaluation for spec items."""
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return self.resolve_value(key)
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def __len__(self):
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"""Number of items in the spec.
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A spec always contain all keys though some may be not specified.
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"""
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return len(self._schema)
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def __contains__(self, key):
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return key in self._schema
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def __iter__(self):
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return iter(self._schema)
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def get_spec_version(spec):
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if not isinstance(spec, dict):
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msg = _('The provided spec is not a map.')
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raise exc.ESchema(message=msg)
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if 'type' not in spec:
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msg = _("The 'type' key is missing from the provided spec map.")
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raise exc.ESchema(message=msg)
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if 'version' not in spec:
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msg = _("The 'version' key is missing from the provided spec map.")
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raise exc.ESchema(message=msg)
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return spec['type'], str(spec['version'])
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