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# -*- coding: utf-8 -*-
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# Copyright (C) 2010-2016 RhodeCode GmbH
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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, version 3
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# (only), as published by the Free Software Foundation.
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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 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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#
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# This program is dual-licensed. If you wish to learn more about the
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# RhodeCode Enterprise Edition, including its added features, Support services,
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# and proprietary license terms, please see https://rhodecode.com/licenses/
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import collections
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import sqlalchemy
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from sqlalchemy import UnicodeText
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from sqlalchemy.ext.mutable import Mutable
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from rhodecode.lib.ext_json import json
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class JsonRaw(unicode):
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"""
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Allows interacting with a JSON types field using a raw string.
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For example::
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db_instance = JsonTable()
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db_instance.enabled = True
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db_instance.json_data = JsonRaw('{"a": 4}')
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This will bypass serialization/checks, and allow storing
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raw values
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"""
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pass
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# Set this to the standard dict if Order is not required
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DictClass = collections.OrderedDict
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class JSONEncodedObj(sqlalchemy.types.TypeDecorator):
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"""
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Represents an immutable structure as a json-encoded string.
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If default is, for example, a dict, then a NULL value in the
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database will be exposed as an empty dict.
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"""
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impl = UnicodeText
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safe = True
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def __init__(self, *args, **kwargs):
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self.default = kwargs.pop('default', None)
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self.safe = kwargs.pop('safe_json', self.safe)
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self.dialect_map = kwargs.pop('dialect_map', {})
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super(JSONEncodedObj, self).__init__(*args, **kwargs)
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def load_dialect_impl(self, dialect):
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if dialect.name in self.dialect_map:
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return dialect.type_descriptor(self.dialect_map[dialect.name])
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return dialect.type_descriptor(self.impl)
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def process_bind_param(self, value, dialect):
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if isinstance(value, JsonRaw):
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value = value
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elif value is not None:
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value = json.dumps(value)
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return value
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def process_result_value(self, value, dialect):
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if self.default is not None and (not value or value == '""'):
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return self.default()
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if value is not None:
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try:
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value = json.loads(value, object_pairs_hook=DictClass)
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except Exception as e:
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if self.safe:
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return self.default()
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else:
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raise
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return value
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class MutationObj(Mutable):
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@classmethod
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def coerce(cls, key, value):
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if isinstance(value, dict) and not isinstance(value, MutationDict):
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return MutationDict.coerce(key, value)
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if isinstance(value, list) and not isinstance(value, MutationList):
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return MutationList.coerce(key, value)
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return value
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@classmethod
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def _listen_on_attribute(cls, attribute, coerce, parent_cls):
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key = attribute.key
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if parent_cls is not attribute.class_:
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return
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# rely on "propagate" here
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parent_cls = attribute.class_
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def load(state, *args):
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val = state.dict.get(key, None)
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if coerce:
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val = cls.coerce(key, val)
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state.dict[key] = val
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if isinstance(val, cls):
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val._parents[state.obj()] = key
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def set(target, value, oldvalue, initiator):
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if not isinstance(value, cls):
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value = cls.coerce(key, value)
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if isinstance(value, cls):
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value._parents[target.obj()] = key
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if isinstance(oldvalue, cls):
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oldvalue._parents.pop(target.obj(), None)
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return value
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def pickle(state, state_dict):
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val = state.dict.get(key, None)
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if isinstance(val, cls):
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if 'ext.mutable.values' not in state_dict:
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state_dict['ext.mutable.values'] = []
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state_dict['ext.mutable.values'].append(val)
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def unpickle(state, state_dict):
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if 'ext.mutable.values' in state_dict:
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for val in state_dict['ext.mutable.values']:
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val._parents[state.obj()] = key
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sqlalchemy.event.listen(parent_cls, 'load', load, raw=True,
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propagate=True)
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sqlalchemy.event.listen(parent_cls, 'refresh', load, raw=True,
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propagate=True)
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sqlalchemy.event.listen(parent_cls, 'pickle', pickle, raw=True,
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propagate=True)
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sqlalchemy.event.listen(attribute, 'set', set, raw=True, retval=True,
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propagate=True)
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sqlalchemy.event.listen(parent_cls, 'unpickle', unpickle, raw=True,
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propagate=True)
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class MutationDict(MutationObj, DictClass):
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@classmethod
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def coerce(cls, key, value):
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"""Convert plain dictionary to MutationDict"""
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self = MutationDict(
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(k, MutationObj.coerce(key, v)) for (k, v) in value.items())
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self._key = key
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return self
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def __setitem__(self, key, value):
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# Due to the way OrderedDict works, this is called during __init__.
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# At this time we don't have a key set, but what is more, the value
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# being set has already been coerced. So special case this and skip.
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if hasattr(self, '_key'):
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value = MutationObj.coerce(self._key, value)
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DictClass.__setitem__(self, key, value)
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self.changed()
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def __delitem__(self, key):
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DictClass.__delitem__(self, key)
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self.changed()
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def __setstate__(self, state):
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self.__dict__ = state
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def __reduce_ex__(self, proto):
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# support pickling of MutationDicts
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d = dict(self)
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return (self.__class__, (d, ))
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class MutationList(MutationObj, list):
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@classmethod
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def coerce(cls, key, value):
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"""Convert plain list to MutationList"""
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self = MutationList((MutationObj.coerce(key, v) for v in value))
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self._key = key
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return self
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def __setitem__(self, idx, value):
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list.__setitem__(self, idx, MutationObj.coerce(self._key, value))
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self.changed()
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def __setslice__(self, start, stop, values):
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list.__setslice__(self, start, stop,
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(MutationObj.coerce(self._key, v) for v in values))
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self.changed()
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def __delitem__(self, idx):
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list.__delitem__(self, idx)
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self.changed()
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def __delslice__(self, start, stop):
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list.__delslice__(self, start, stop)
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self.changed()
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def append(self, value):
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list.append(self, MutationObj.coerce(self._key, value))
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self.changed()
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def insert(self, idx, value):
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list.insert(self, idx, MutationObj.coerce(self._key, value))
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self.changed()
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def extend(self, values):
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list.extend(self, (MutationObj.coerce(self._key, v) for v in values))
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self.changed()
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def pop(self, *args, **kw):
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value = list.pop(self, *args, **kw)
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self.changed()
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return value
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def remove(self, value):
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list.remove(self, value)
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self.changed()
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def JsonType(impl=None, **kwargs):
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"""
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Helper for using a mutation obj, it allows to use .with_variant easily.
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example::
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settings = Column('settings_json',
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MutationObj.as_mutable(
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JsonType(dialect_map=dict(mysql=UnicodeText(16384))))
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"""
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if impl == 'list':
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return JSONEncodedObj(default=list, **kwargs)
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elif impl == 'dict':
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return JSONEncodedObj(default=DictClass, **kwargs)
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else:
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return JSONEncodedObj(**kwargs)
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JSON = MutationObj.as_mutable(JsonType())
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"""
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A type to encode/decode JSON on the fly
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sqltype is the string type for the underlying DB column::
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Column(JSON) (defaults to UnicodeText)
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"""
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JSONDict = MutationObj.as_mutable(JsonType('dict'))
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"""
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A type to encode/decode JSON dictionaries on the fly
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"""
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JSONList = MutationObj.as_mutable(JsonType('list'))
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"""
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A type to encode/decode JSON lists` on the fly
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"""
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