Eos/eos/core/objects/__init__.py

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