178 lines
5.5 KiB
Python
178 lines
5.5 KiB
Python
# Copyright 2013 - Mirantis, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from oslo_db.sqlalchemy import models as oslo_models
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import sqlalchemy as sa
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from sqlalchemy import event
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from sqlalchemy.ext import declarative
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from sqlalchemy.orm import attributes
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from mistral.services import security
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from mistral_lib import utils
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def id_column():
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return sa.Column(
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sa.String(36),
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primary_key=True,
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default=utils.generate_unicode_uuid
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)
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class _MistralModelBase(oslo_models.ModelBase, oslo_models.TimestampMixin):
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"""Base class for all Mistral SQLAlchemy DB Models."""
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created_at = sa.Column(sa.DateTime, default=lambda: utils.utc_now_sec())
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updated_at = sa.Column(sa.DateTime, onupdate=lambda: utils.utc_now_sec())
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__table__ = None
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__hash__ = object.__hash__
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def __init__(self, **kwargs):
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for key, value in kwargs.items():
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setattr(self, key, value)
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def __eq__(self, other):
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if type(self) is not type(other):
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return False
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for col in self.__table__.columns:
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# In case of single table inheritance a class attribute
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# corresponding to a table column may not exist so we need
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# to skip these attributes.
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if (hasattr(self, col.name)
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and hasattr(other, col.name)
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and getattr(self, col.name) != getattr(other, col.name)):
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return False
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return True
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def __ne__(self, other):
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return not self.__eq__(other)
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def to_dict(self):
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"""sqlalchemy based automatic to_dict method."""
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d = {col_name: col_val for col_name, col_val in self.iter_columns()}
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utils.datetime_to_str_in_dict(d, 'created_at')
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utils.datetime_to_str_in_dict(d, 'updated_at')
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return d
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def iter_column_names(self):
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"""Returns an iterator for loaded column names.
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:return: A generator function for column names.
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"""
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# If a column is unloaded at this point, it is
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# probably deferred. We do not want to access it
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# here and thereby cause it to load.
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unloaded = attributes.instance_state(self).unloaded
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for col in self.__table__.columns:
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if col.name not in unloaded and hasattr(self, col.name):
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yield col.name
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def iter_columns(self):
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"""Returns an iterator for loaded columns.
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:return: A generator function that generates
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tuples (column name, column value).
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"""
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for col_name in self.iter_column_names():
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yield col_name, getattr(self, col_name)
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def get_clone(self):
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"""Clones current object, loads all fields and returns the result."""
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m = self.__class__()
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for col in self.__table__.columns:
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if hasattr(self, col.name):
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setattr(m, col.name, getattr(self, col.name))
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setattr(
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m,
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'created_at',
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utils.datetime_to_str(getattr(self, 'created_at'))
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)
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updated_at = getattr(self, 'updated_at')
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# NOTE(nmakhotkin): 'updated_at' field is empty for just created
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# object since it has not updated yet.
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if updated_at:
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setattr(m, 'updated_at', utils.datetime_to_str(updated_at))
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return m
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def __repr__(self):
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return '%s %s' % (type(self).__name__, self.to_dict().__repr__())
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@classmethod
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def _get_nullable_column_names(cls):
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return [c.name for c in cls.__table__.columns if c.nullable]
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@classmethod
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def check_allowed_none_values(cls, column_names):
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"""Checks if the given columns can be assigned with None value.
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:param column_names: The names of the columns to check.
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"""
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all_columns = cls.__table__.columns.keys()
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nullable_columns = cls._get_nullable_column_names()
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for col in column_names:
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if col not in all_columns:
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raise ValueError("'{}' is not a valid field name.".format(col))
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if col not in nullable_columns:
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raise ValueError(
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"The field '{}' can't hold None value.".format(col)
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)
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MistralModelBase = declarative.declarative_base(cls=_MistralModelBase)
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# Secure model related stuff.
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class MistralSecureModelBase(MistralModelBase):
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"""Base class for all secure models."""
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__abstract__ = True
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scope = sa.Column(sa.String(80), default='private')
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project_id = sa.Column(sa.String(80), default=security.get_project_id)
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def _set_project_id(target, value, oldvalue, initiator):
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return security.get_project_id()
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def register_secure_model_hooks():
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# Make sure 'project_id' is always properly set.
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for sec_model_class in utils.iter_subclasses(MistralSecureModelBase):
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if '__abstract__' not in sec_model_class.__dict__:
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event.listen(
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sec_model_class.project_id,
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'set',
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_set_project_id,
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retval=True
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)
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