769 lines
23 KiB
Python
769 lines
23 KiB
Python
# coding: utf-8
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#
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# Copyright 2011-2019 the WSME authors and contributors
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# (See https://opendev.org/x/wsme/)
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#
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# This module is part of WSME and is also released under
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# the MIT License: http://www.opensource.org/licenses/mit-license.php
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#
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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 base64
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import datetime
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import decimal
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import inspect
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import io
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import re
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import weakref
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from oslo_log import log
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from ironic.common import exception
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LOG = log.getLogger(__name__)
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pod_types = (int, bytes, str, float, bool)
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native_types = pod_types + (datetime.datetime, decimal.Decimal)
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_promotable_types = (int, str, bytes)
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class ArrayType(object):
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def __init__(self, item_type):
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if iscomplex(item_type):
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self._item_type = weakref.ref(item_type)
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else:
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self._item_type = item_type
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def __hash__(self):
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return hash(self.item_type)
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def __eq__(self, other):
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return isinstance(other, ArrayType) \
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and self.item_type == other.item_type
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def sample(self):
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return [getattr(self.item_type, 'sample', self.item_type)()]
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@property
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def item_type(self):
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if isinstance(self._item_type, weakref.ref):
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return self._item_type()
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else:
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return self._item_type
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def validate(self, value):
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if value is None:
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return
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if not isinstance(value, list):
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raise ValueError("Wrong type. Expected '[%s]', got '%s'" % (
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self.item_type, type(value)
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))
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return [
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validate_value(self.item_type, item)
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for item in value
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]
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class DictType(object):
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def __init__(self, key_type, value_type):
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if key_type not in (int, bytes, str, float, bool):
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raise ValueError("Dictionaries key can only be a pod type")
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self.key_type = key_type
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if iscomplex(value_type):
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self._value_type = weakref.ref(value_type)
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else:
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self._value_type = value_type
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def __hash__(self):
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return hash((self.key_type, self.value_type))
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def sample(self):
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key = getattr(self.key_type, 'sample', self.key_type)()
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value = getattr(self.value_type, 'sample', self.value_type)()
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return {key: value}
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@property
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def value_type(self):
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if isinstance(self._value_type, weakref.ref):
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return self._value_type()
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else:
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return self._value_type
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def validate(self, value):
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if not isinstance(value, dict):
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raise ValueError("Wrong type. Expected '{%s: %s}', got '%s'" % (
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self.key_type, self.value_type, type(value)
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))
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return dict((
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(
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validate_value(self.key_type, key),
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validate_value(self.value_type, v)
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) for key, v in value.items()
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))
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class UserType(object):
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basetype = None
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name = None
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def validate(self, value):
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return value
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def tobasetype(self, value):
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return value
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def frombasetype(self, value):
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return value
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def isusertype(class_):
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return isinstance(class_, UserType)
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class BinaryType(UserType):
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"""A user type that use base64 strings to carry binary data.
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"""
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basetype = bytes
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name = 'binary'
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def tobasetype(self, value):
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if value is None:
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return None
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return base64.encodestring(value)
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def frombasetype(self, value):
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if value is None:
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return None
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return base64.decodestring(value)
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#: The binary almost-native type
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binary = BinaryType()
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class IntegerType(UserType):
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"""A simple integer type. Can validate a value range.
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:param minimum: Possible minimum value
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:param maximum: Possible maximum value
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Example::
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Price = IntegerType(minimum=1)
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"""
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basetype = int
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name = "integer"
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def __init__(self, minimum=None, maximum=None):
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self.minimum = minimum
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self.maximum = maximum
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@staticmethod
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def frombasetype(value):
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return int(value) if value is not None else None
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def validate(self, value):
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if self.minimum is not None and value < self.minimum:
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error = 'Value should be greater or equal to %s' % self.minimum
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raise ValueError(error)
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if self.maximum is not None and value > self.maximum:
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error = 'Value should be lower or equal to %s' % self.maximum
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raise ValueError(error)
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return value
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class StringType(UserType):
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"""A simple string type. Can validate a length and a pattern.
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:param min_length: Possible minimum length
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:param max_length: Possible maximum length
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:param pattern: Possible string pattern
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Example::
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Name = StringType(min_length=1, pattern='^[a-zA-Z ]*$')
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"""
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basetype = str
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name = "string"
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def __init__(self, min_length=None, max_length=None, pattern=None):
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self.min_length = min_length
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self.max_length = max_length
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if isinstance(pattern, str):
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self.pattern = re.compile(pattern)
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else:
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self.pattern = pattern
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def validate(self, value):
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if not isinstance(value, self.basetype):
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error = 'Value should be string'
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raise ValueError(error)
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if self.min_length is not None and len(value) < self.min_length:
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error = 'Value should have a minimum character requirement of %s' \
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% self.min_length
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raise ValueError(error)
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if self.max_length is not None and len(value) > self.max_length:
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error = 'Value should have a maximum character requirement of %s' \
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% self.max_length
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raise ValueError(error)
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if self.pattern is not None and not self.pattern.search(value):
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error = 'Value should match the pattern %s' % self.pattern.pattern
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raise ValueError(error)
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return value
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class Enum(UserType):
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"""A simple enumeration type. Can be based on any non-complex type.
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:param basetype: The actual data type
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:param values: A set of possible values
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If nullable, 'None' should be added the values set.
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Example::
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Gender = Enum(str, 'male', 'female')
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Specie = Enum(str, 'cat', 'dog')
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"""
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def __init__(self, basetype, *values, **kw):
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self.basetype = basetype
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self.values = set(values)
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name = kw.pop('name', None)
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if name is None:
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name = "Enum(%s)" % ', '.join((str(v) for v in values))
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self.name = name
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def validate(self, value):
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if value not in self.values:
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raise ValueError("Value should be one of: %s" %
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', '.join(map(str, self.values)))
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return value
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def tobasetype(self, value):
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return value
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def frombasetype(self, value):
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return value
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class UnsetType(object):
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def __bool__(self):
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return False
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def __repr__(self):
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return 'Unset'
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Unset = UnsetType()
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def validate_value(datatype, value):
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if value in (Unset, None):
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return value
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# Try to promote the data type to one of our complex types.
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if isinstance(datatype, list):
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datatype = ArrayType(datatype[0])
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elif isinstance(datatype, dict):
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datatype = DictType(*list(datatype.items())[0])
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# If the datatype has its own validator, use that.
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if hasattr(datatype, 'validate'):
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return datatype.validate(value)
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# Do type promotion/conversion and data validation for builtin
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# types.
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v_type = type(value)
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if datatype == int:
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if v_type in _promotable_types:
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try:
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# Try to turn the value into an int
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value = datatype(value)
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except ValueError:
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# An error is raised at the end of the function
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# when the types don't match.
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pass
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elif datatype is float and v_type in _promotable_types:
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try:
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value = float(value)
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except ValueError:
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# An error is raised at the end of the function
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# when the types don't match.
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pass
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elif datatype is str and isinstance(value, bytes):
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value = value.decode()
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elif datatype is bytes and isinstance(value, str):
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value = value.encode()
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if not isinstance(value, datatype):
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raise ValueError(
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"Wrong type. Expected '%s', got '%s'" % (
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datatype, v_type
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))
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return value
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def iscomplex(datatype):
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return inspect.isclass(datatype) \
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and '_wsme_attributes' in datatype.__dict__
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class wsproperty(property):
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"""A specialised :class:`property` to define typed-property on complex types.
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Example::
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class MyComplexType(Base):
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def get_aint(self):
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return self._aint
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def set_aint(self, value):
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assert avalue < 10 # Dummy input validation
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self._aint = value
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aint = wsproperty(int, get_aint, set_aint, mandatory=True)
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"""
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def __init__(self, datatype, fget, fset=None,
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mandatory=False, doc=None, name=None):
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property.__init__(self, fget, fset)
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#: The property name in the parent python class
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self.key = None
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#: The attribute name on the public of the api.
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#: Defaults to :attr:`key`
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self.name = name
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#: property data type
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self.datatype = datatype
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#: True if the property is mandatory
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self.mandatory = mandatory
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class wsattr(object):
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"""Complex type attribute definition.
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Example::
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class MyComplexType(ctypes.Base):
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optionalvalue = int
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mandatoryvalue = wsattr(int, mandatory=True)
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named_value = wsattr(int, name='named.value')
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After inspection, the non-wsattr attributes will be replaced, and
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the above class will be equivalent to::
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class MyComplexType(ctypes.Base):
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optionalvalue = wsattr(int)
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mandatoryvalue = wsattr(int, mandatory=True)
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"""
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def __init__(self, datatype, mandatory=False, name=None, default=Unset,
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readonly=False):
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#: The attribute name in the parent python class.
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#: Set by :func:`inspect_class`
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self.key = None # will be set by class inspection
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#: The attribute name on the public of the api.
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#: Defaults to :attr:`key`
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self.name = name
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self._datatype = (datatype,)
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#: True if the attribute is mandatory
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self.mandatory = mandatory
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#: Default value. The attribute will return this instead
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#: of :data:`Unset` if no value has been set.
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self.default = default
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#: If True value cannot be set from json/xml input data
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self.readonly = readonly
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self.complextype = None
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def _get_dataholder(self, instance):
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dataholder = getattr(instance, '_wsme_dataholder', None)
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if dataholder is None:
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dataholder = instance._wsme_DataHolderClass()
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instance._wsme_dataholder = dataholder
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return dataholder
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def __get__(self, instance, owner):
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if instance is None:
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return self
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return getattr(
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self._get_dataholder(instance),
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self.key,
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self.default
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)
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def __set__(self, instance, value):
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try:
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value = validate_value(self.datatype, value)
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except (ValueError, TypeError) as e:
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raise exception.InvalidInput(self.name, value, str(e))
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dataholder = self._get_dataholder(instance)
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if value is Unset:
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if hasattr(dataholder, self.key):
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delattr(dataholder, self.key)
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else:
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setattr(dataholder, self.key, value)
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def __delete__(self, instance):
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self.__set__(instance, Unset)
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def _get_datatype(self):
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if isinstance(self._datatype, tuple):
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self._datatype = \
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self.complextype().__registry__.resolve_type(self._datatype[0])
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if isinstance(self._datatype, weakref.ref):
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return self._datatype()
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if isinstance(self._datatype, list):
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return [
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item() if isinstance(item, weakref.ref) else item
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for item in self._datatype
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]
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return self._datatype
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def _set_datatype(self, datatype):
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self._datatype = datatype
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#: attribute data type. Can be either an actual type,
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#: or a type name, in which case the actual type will be
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#: determined when needed (generally just before scanning the api).
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datatype = property(_get_datatype, _set_datatype)
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def iswsattr(attr):
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if inspect.isfunction(attr) or inspect.ismethod(attr):
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return False
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if isinstance(attr, property) and not isinstance(attr, wsproperty):
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return False
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return True
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def sort_attributes(class_, attributes):
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"""Sort a class attributes list.
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3 mechanisms are attempted :
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#. Look for a _wsme_attr_order attribute on the class. This allow
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to define an arbitrary order of the attributes (useful for
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generated types).
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#. Access the object source code to find the declaration order.
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#. Sort by alphabetically
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"""
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if not len(attributes):
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return
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attrs = dict((a.key, a) for a in attributes)
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if hasattr(class_, '_wsme_attr_order'):
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names_order = class_._wsme_attr_order
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else:
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names = attrs.keys()
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names_order = []
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try:
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lines = []
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for cls in inspect.getmro(class_):
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if cls is object:
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continue
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lines[len(lines):] = inspect.getsourcelines(cls)[0]
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for line in lines:
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line = line.strip().replace(" ", "")
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if '=' in line:
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aname = line[:line.index('=')]
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if aname in names and aname not in names_order:
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names_order.append(aname)
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if len(names_order) < len(names):
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names_order.extend((
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name for name in names if name not in names_order))
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assert len(names_order) == len(names)
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except (TypeError, IOError):
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names_order = list(names)
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names_order.sort()
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attributes[:] = [attrs[name] for name in names_order]
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def inspect_class(class_):
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"""Extract a list of (name, wsattr|wsproperty) for the given class"""
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attributes = []
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for name, attr in inspect.getmembers(class_, iswsattr):
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if name.startswith('_'):
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continue
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if inspect.isroutine(attr):
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continue
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if isinstance(attr, (wsattr, wsproperty)):
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attrdef = attr
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else:
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if (attr not in native_types
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and (inspect.isclass(attr) or isinstance(attr, (list, dict)))):
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register_type(attr)
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attrdef = getattr(class_, '__wsattrclass__', wsattr)(attr)
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attrdef.key = name
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if attrdef.name is None:
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attrdef.name = name
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attrdef.complextype = weakref.ref(class_)
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attributes.append(attrdef)
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setattr(class_, name, attrdef)
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sort_attributes(class_, attributes)
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return attributes
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|
|
|
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def list_attributes(class_):
|
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"""Returns a list of a complex type attributes."""
|
|
if not iscomplex(class_):
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raise TypeError("%s is not a registered type")
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return class_._wsme_attributes
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|
|
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def make_dataholder(class_):
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# the slots are computed outside the class scope to avoid
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# 'attr' to pullute the class namespace, which leads to weird
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# things if one of the slots is named 'attr'.
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slots = [attr.key for attr in class_._wsme_attributes]
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|
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class DataHolder(object):
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__slots__ = slots
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DataHolder.__name__ = class_.__name__ + 'DataHolder'
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return DataHolder
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class Registry(object):
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def __init__(self):
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self._complex_types = []
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self.array_types = set()
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self.dict_types = set()
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|
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@property
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def complex_types(self):
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return [t() for t in self._complex_types if t()]
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|
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def register(self, class_):
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|
"""Make sure a type is registered.
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|
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|
It is automatically called by :class:`expose() <expose.expose>`
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|
and :class:`validate() <expose.validate>`.
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|
Unless you want to control when the class inspection is done there
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is no need to call it.
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"""
|
|
if class_ is None or \
|
|
class_ in native_types or \
|
|
isinstance(class_, UserType) or iscomplex(class_) or \
|
|
isinstance(class_, ArrayType) or isinstance(class_, DictType):
|
|
return class_
|
|
|
|
if isinstance(class_, list):
|
|
if len(class_) != 1:
|
|
raise ValueError("Cannot register type %s" % repr(class_))
|
|
dt = ArrayType(class_[0])
|
|
self.register(dt.item_type)
|
|
self.array_types.add(dt)
|
|
return dt
|
|
|
|
if isinstance(class_, dict):
|
|
if len(class_) != 1:
|
|
raise ValueError("Cannot register type %s" % repr(class_))
|
|
dt = DictType(*list(class_.items())[0])
|
|
self.register(dt.value_type)
|
|
self.dict_types.add(dt)
|
|
return dt
|
|
|
|
class_._wsme_attributes = None
|
|
class_._wsme_attributes = inspect_class(class_)
|
|
class_._wsme_DataHolderClass = make_dataholder(class_)
|
|
|
|
class_.__registry__ = self
|
|
self._complex_types.append(weakref.ref(class_))
|
|
return class_
|
|
|
|
def reregister(self, class_):
|
|
"""Register a type which may already have been registered.
|
|
|
|
"""
|
|
self._unregister(class_)
|
|
return self.register(class_)
|
|
|
|
def _unregister(self, class_):
|
|
"""Remove a previously registered type.
|
|
|
|
"""
|
|
# Clear the existing attribute reference so it is rebuilt if
|
|
# the class is registered again later.
|
|
if hasattr(class_, '_wsme_attributes'):
|
|
del class_._wsme_attributes
|
|
# FIXME(dhellmann): This method does not recurse through the
|
|
# types like register() does. Should it?
|
|
if isinstance(class_, list):
|
|
at = ArrayType(class_[0])
|
|
try:
|
|
self.array_types.remove(at)
|
|
except KeyError:
|
|
pass
|
|
elif isinstance(class_, dict):
|
|
key_type, value_type = list(class_.items())[0]
|
|
self.dict_types = set(
|
|
dt for dt in self.dict_types
|
|
if (dt.key_type, dt.value_type) != (key_type, value_type)
|
|
)
|
|
# We can't use remove() here because the items in
|
|
# _complex_types are weakref objects pointing to the classes,
|
|
# so we can't compare with them directly.
|
|
self._complex_types = [
|
|
ct for ct in self._complex_types
|
|
if ct() is not class_
|
|
]
|
|
|
|
def lookup(self, typename):
|
|
LOG.debug('Lookup %s', typename)
|
|
modname = None
|
|
if '.' in typename:
|
|
modname, typename = typename.rsplit('.', 1)
|
|
for ct in self._complex_types:
|
|
ct = ct()
|
|
if ct is not None and typename == ct.__name__ and (
|
|
modname is None or modname == ct.__module__):
|
|
return ct
|
|
|
|
def resolve_type(self, type_):
|
|
if isinstance(type_, str):
|
|
return self.lookup(type_)
|
|
if isinstance(type_, list):
|
|
type_ = ArrayType(type_[0])
|
|
if isinstance(type_, dict):
|
|
type_ = DictType(list(type_.keys())[0], list(type_.values())[0])
|
|
if isinstance(type_, ArrayType):
|
|
type_ = ArrayType(self.resolve_type(type_.item_type))
|
|
self.array_types.add(type_)
|
|
elif isinstance(type_, DictType):
|
|
type_ = DictType(
|
|
type_.key_type,
|
|
self.resolve_type(type_.value_type)
|
|
)
|
|
self.dict_types.add(type_)
|
|
else:
|
|
type_ = self.register(type_)
|
|
return type_
|
|
|
|
|
|
# Default type registry
|
|
registry = Registry()
|
|
|
|
|
|
def register_type(class_):
|
|
return registry.register(class_)
|
|
|
|
|
|
class BaseMeta(type):
|
|
def __new__(cls, name, bases, dct):
|
|
if bases and bases[0] is not object and '__registry__' not in dct:
|
|
dct['__registry__'] = registry
|
|
return type.__new__(cls, name, bases, dct)
|
|
|
|
def __init__(cls, name, bases, dct):
|
|
if bases and bases[0] is not object and cls.__registry__:
|
|
cls.__registry__.register(cls)
|
|
|
|
|
|
class Base(metaclass=BaseMeta):
|
|
"""Base type for complex types"""
|
|
def __init__(self, **kw):
|
|
for key, value in kw.items():
|
|
if hasattr(self, key):
|
|
setattr(self, key, value)
|
|
|
|
|
|
class File(Base):
|
|
"""A complex type that represents a file.
|
|
|
|
In the particular case of protocol accepting form encoded data as
|
|
input, File can be loaded from a form file field.
|
|
"""
|
|
#: The file name
|
|
filename = str
|
|
|
|
#: Mime type of the content
|
|
contenttype = str
|
|
|
|
def _get_content(self):
|
|
if self._content is None and self._file:
|
|
self._content = self._file.read()
|
|
return self._content
|
|
|
|
def _set_content(self, value):
|
|
self._content = value
|
|
self._file = None
|
|
|
|
#: File content
|
|
content = wsproperty(binary, _get_content, _set_content)
|
|
|
|
def __init__(self, filename=None, file=None, content=None,
|
|
contenttype=None, fieldstorage=None):
|
|
self.filename = filename
|
|
self.contenttype = contenttype
|
|
self._file = file
|
|
self._content = content
|
|
|
|
if fieldstorage is not None:
|
|
if fieldstorage.file:
|
|
self._file = fieldstorage.file
|
|
self.filename = fieldstorage.filename
|
|
self.contenttype = str(fieldstorage.type)
|
|
else:
|
|
self._content = fieldstorage.value
|
|
|
|
@property
|
|
def file(self):
|
|
if self._file is None and self._content:
|
|
self._file = io.BytesIO(self._content)
|
|
return self._file
|
|
|
|
|
|
class Response(object):
|
|
"""Object to hold the "response" from a view function"""
|
|
def __init__(self, obj, status_code=None, error=None,
|
|
return_type=Unset):
|
|
#: Store the result object from the view
|
|
self.obj = obj
|
|
|
|
#: Store an optional status_code
|
|
self.status_code = status_code
|
|
|
|
#: Return error details
|
|
#: Must be a dictionnary with the following keys: faultcode,
|
|
#: faultstring and an optional debuginfo
|
|
self.error = error
|
|
|
|
#: Return type
|
|
#: Type of the value returned by the function
|
|
#: If the return type is wsme.types.Unset it will be ignored
|
|
#: and the default return type will prevail.
|
|
self.return_type = return_type
|