321 lines
8.6 KiB
Python
321 lines
8.6 KiB
Python
# Eos - Verifiable elections
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# Copyright © 2017 RunasSudo (Yingtong Li)
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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try:
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__pragma__ = __pragma__
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is_python = False
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except:
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is_python = True
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def __pragma__(*args):
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pass
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# Libraries
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# =========
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if is_python:
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__pragma__('skip')
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import pymongo
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from bson.binary import UUIDLegacy
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import base64
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import hashlib
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import json
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import uuid
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__pragma__('noskip')
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else:
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# Load json.js
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lib = __pragma__('js', '''
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(function() {{
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{}
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var exports = {{}};
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exports.stringify = stringify_main;
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return exports;
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}})()''', __include__('eos/core/objects/json.js'))
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# Database
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# ========
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if is_python:
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client = pymongo.MongoClient()
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db = client['test']
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# Fields
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# ======
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class Field:
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def __init__(self, *args, **kwargs):
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self.default = kwargs.get('default', kwargs.get('py_default', None))
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self.hashed = kwargs.get('hashed', True)
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class PrimitiveField(Field):
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def serialise(self, value):
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return value
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def deserialise(self, value):
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return value
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DictField = PrimitiveField
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IntField = PrimitiveField
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StringField = PrimitiveField
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class EmbeddedObjectField(Field):
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def __init__(self, object_type=None, *args, **kwargs):
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super().__init__(*args, **kwargs)
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self.object_type = object_type
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def serialise(self, value):
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return EosObject.serialise_and_wrap(value, self.object_type)
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def deserialise(self, value):
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return EosObject.deserialise_and_unwrap(value, self.object_type)
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class ListField(Field):
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def __init__(self, element_field=None, *args, **kwargs):
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super().__init__(default=EosList, *args, **kwargs)
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self.element_field = element_field
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def serialise(self, value):
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return [self.element_field.serialise(x) for x in value]
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def deserialise(self, value):
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return [self.element_field.deserialise(x) for x in value]
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class EmbeddedObjectListField(Field):
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def __init__(self, object_type=None, *args, **kwargs):
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super().__init__(default=EosList, *args, **kwargs)
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self.object_type = object_type
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def serialise(self, value):
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return [EosObject.serialise_and_wrap(x, self.object_type) for x in value]
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def deserialise(self, value):
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return [EosObject.deserialise_and_unwrap(x, self.object_type) for x in value]
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if is_python:
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class UUIDField(Field):
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def __init__(self, *args, **kwargs):
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super().__init__(default=uuid.uuid4, *args, **kwargs)
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def serialise(self, value):
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return str(value)
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def deserialise(self, value):
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return uuid.UUID(value)
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else:
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UUIDField = PrimitiveField
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# Objects
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# =======
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class EosObjectType(type):
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def __new__(meta, name, bases, attrs):
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cls = type.__new__(meta, name, bases, attrs)
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cls._name = ((cls.__module__ if is_python else meta.__next_class_module__) + '.' + cls.__name__).replace('.js.', '.').replace('.python.', '.') #TNYI: module and qualname
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if name != 'EosObject':
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EosObject.objects[cls._name] = cls
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if '_db_name' not in attrs:
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# Don't inherit _db_name, use only if explicitly given
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cls._db_name = cls._name
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return cls
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class EosObject(metaclass=EosObjectType):
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objects = {}
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def __init__(self):
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self._instance = (None, None)
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self._inited = False
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def post_init(self):
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self._inited = True
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def recurse_parents(self, cls):
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if not isinstance(cls, type):
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cls = EosObject.objects[cls]
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if isinstance(self, cls):
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return self
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if self._instance[0]:
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return self._instance[0].recurse_parents(cls)
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return None
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@staticmethod
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def serialise_and_wrap(value, object_type=None, hashed=False):
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if object_type:
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if value:
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return value.serialise(hashed)
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return None
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return {'type': value._name, 'value': (value.serialise(hashed) if value else None)}
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@staticmethod
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def deserialise_and_unwrap(value, object_type=None):
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if object_type:
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return object_type.deserialise(value)
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return EosObject.objects[value['type']].deserialise(value['value'])
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@staticmethod
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def to_json(value):
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if is_python:
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return json.dumps(value, sort_keys=True)
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else:
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return lib.stringify(value)
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@staticmethod
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def from_json(value):
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if is_python:
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return json.loads(value)
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else:
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return JSON.parse(value)
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class EosList(EosObject):
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def __init__(self, *args):
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super().__init__()
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self.impl = list(*args)
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def post_init(self):
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for i in range(len(self.impl)):
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val = self.impl[i]
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val._instance = (self, i)
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if not val._inited:
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val.post_init()
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# Lists in JS are implemented as native Arrays, so no cheating here :(
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def __len__(self):
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return len(self.impl)
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def __getitem__(self, idx):
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return self.impl[idx]
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def __setitem__(self, idx, val):
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self.impl[idx] = val
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val._instance = (self, idx)
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if not val._inited:
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val.post_init()
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def __contains__(self, val):
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return val in self.impl
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def append(self, value):
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if isinstance(value, EosObject):
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value._instance = (self, len(self))
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if not value._inited:
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value.post_init()
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return self.impl.append(value)
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class DocumentObjectType(EosObjectType):
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def __new__(meta, name, bases, attrs):
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cls = EosObjectType.__new__(meta, name, bases, attrs)
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# Process fields
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fields = {}
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if hasattr(cls, '_fields'):
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fields = cls._fields.copy() if is_python else Object.create(cls._fields)
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for attr in list(dir(cls)):
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if not is_python:
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# We must skip things with getters or else they will be called here (too soon)
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if Object.getOwnPropertyDescriptor(cls, attr).js_get:
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continue
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val = getattr(cls, attr)
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if isinstance(val, Field):
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val._instance = (cls, name)
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fields[attr] = val
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delattr(cls, attr)
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cls._fields = fields
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# Make properties
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if is_python:
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def make_property(name, field):
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def field_getter(self):
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return self._field_values[name]
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def field_setter(self, value):
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if isinstance(value, EosObject):
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value._instance = (self, name)
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if not value._inited:
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value.post_init()
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self._field_values[name] = value
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return property(field_getter, field_setter)
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for attr, val in fields.items():
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setattr(cls, attr, make_property(attr, val))
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else:
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# Handled at instance level
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pass
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return cls
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class DocumentObject(EosObject, metaclass=DocumentObjectType):
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_ver = StringField(default='0.1')
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def __init__(self, *args, **kwargs):
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super().__init__()
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self._field_values = {}
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# Different to Python
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for attr, val in self._fields.items():
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if is_python:
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# Properties handled above
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pass
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else:
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def make_property(name, field):
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def field_getter():
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return self._field_values[name]
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def field_setter(value):
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if isinstance(value, EosObject):
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value._instance = (self, name)
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if not value._inited:
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value.post_init()
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self._field_values[name] = value
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return (field_getter, field_setter)
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prop = make_property(attr, val)
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# TNYI: No support for property()
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Object.defineProperty(self, attr, {
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'get': prop[0],
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'set': prop[1]
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})
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if attr in kwargs:
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setattr(self, attr, kwargs[attr])
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else:
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default = val.default
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if default is not None and callable(default):
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default = default()
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setattr(self, attr, default)
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# TNYI: Strange things happen with py_ attributes
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def serialise(self, hashed=False):
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return {(attr[3:] if attr.startswith('py_') else attr): val.serialise(getattr(self, attr)) for attr, val in self._fields.items() if (val.hashed or not hashed)}
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@classmethod
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def deserialise(cls, value):
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return cls(**{attr: val.deserialise(value[attr[3:] if attr.startswith('py_') else attr]) for attr, val in cls._fields.items()})
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class TopLevelObject(DocumentObject):
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def save(self):
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#res = db[self._name].replace_one({'_id': self.serialise()['_id']}, self.serialise(), upsert=True)
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res = db[self._db_name].replace_one({'_id': self._fields['_id'].serialise(self._id)}, EosObject.serialise_and_wrap(self), upsert=True)
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@classmethod
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def get_all(cls):
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return [EosObject.deserialise_and_unwrap(x) for x in db[cls._db_name].find()]
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@classmethod
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def get_by_id(cls, _id):
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return EosObject.deserialise_and_unwrap(db[cls._db_name].find_one(_id))
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class EmbeddedObject(DocumentObject):
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pass
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