92 lines
2.8 KiB
Python
92 lines
2.8 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 six
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from senlin.common import exception as exc
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from senlin.common.i18n import _
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class BaseConstraint(collections.Mapping):
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KEYS = (
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TYPE, CONSTRAINT,
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) = (
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'type', 'constraint',
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)
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def __str__(self):
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"""Utility method for generating schema docs."""
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return self.desc()
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def validate(self, value, schema=None, context=None):
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"""Base entry for validation."""
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if not self._validate(value, schema=schema, context=context):
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raise ValueError(self._error(value))
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@classmethod
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def _name(cls):
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return cls.__name__
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def __getitem__(self, key):
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if key == self.TYPE:
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return self._name()
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elif key == self.CONSTRAINT:
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return self._constraint()
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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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return len(list(iter(self)))
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class AllowedValues(BaseConstraint):
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def __init__(self, allowed_values):
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if (not isinstance(allowed_values, collections.Sequence) or
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isinstance(allowed_values, six.string_types)):
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msg = _('AllowedValues must be a list or a string')
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raise exc.ESchema(message=msg)
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self.allowed = tuple(allowed_values)
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def desc(self):
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values = ', '.join(str(v) for v in self.allowed)
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return _('Allowed values: %s') % values
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def _error(self, value):
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values = ', '.join(str(v) for v in self.allowed)
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return _("'%(value)s' must be one of the allowed values: "
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"%(allowed)s") % dict(value=value, allowed=values)
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def _validate(self, value, schema=None, context=None):
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if isinstance(value, list):
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return all(v in self.allowed for v in value)
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# try implicit type conversion
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if schema is not None:
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_allowed = tuple(schema.to_schema_type(v)
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for v in self.allowed)
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return schema.to_schema_type(value) in _allowed
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return value in self.allowed
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def _constraint(self):
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return list(self.allowed)
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