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118 lines
3.4 KiB
118 lines
3.4 KiB
#!/usr/bin/env python
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#
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# Copyright (C) 2020 GNS3 Technologies Inc.
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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 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 General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import uuid
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from fastapi.encoders import jsonable_encoder
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from sqlalchemy import Column, DateTime, func, inspect
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from sqlalchemy.types import TypeDecorator, CHAR, VARCHAR
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from sqlalchemy.dialects.postgresql import UUID
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from sqlalchemy.ext.declarative import as_declarative
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@as_declarative()
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class Base:
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def asdict(self):
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return {c.key: getattr(self, c.key) for c in inspect(self).mapper.column_attrs}
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def asjson(self):
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return jsonable_encoder(self.asdict())
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class GUID(TypeDecorator):
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"""
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Platform-independent GUID type.
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Uses PostgreSQL's UUID type, otherwise uses
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CHAR(32), storing as stringified hex values.
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"""
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impl = CHAR
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cache_ok = True
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def load_dialect_impl(self, dialect):
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if dialect.name == "postgresql":
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return dialect.type_descriptor(UUID())
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else:
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return dialect.type_descriptor(CHAR(32))
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def process_bind_param(self, value, dialect):
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if value is None:
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return value
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elif dialect.name == "postgresql":
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return str(value)
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else:
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if not isinstance(value, uuid.UUID):
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return "%.32x" % uuid.UUID(value).int
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else:
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# hexstring
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return "%.32x" % value.int
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def process_result_value(self, value, dialect):
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if value is None:
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return value
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else:
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if not isinstance(value, uuid.UUID):
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value = uuid.UUID(value)
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return value
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class ListException(Exception):
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pass
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class ListType(TypeDecorator):
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"""
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Save/restore a Python list to/from a database column.
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"""
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impl = VARCHAR
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cache_ok = True
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def __init__(self, separator=',', *args, **kwargs):
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self._separator = separator
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super().__init__(*args, **kwargs)
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def process_bind_param(self, value, dialect):
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if value is not None:
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if any(self._separator in str(item) for item in value):
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raise ListException(f"List values cannot contain '{self._separator}'"
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f"Please use a different separator.")
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return self._separator.join(map(str, value))
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def process_result_value(self, value, dialect):
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if value is None:
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return []
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else:
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return list(map(str, value.split(self._separator)))
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class BaseTable(Base):
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__abstract__ = True
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created_at = Column(DateTime, server_default=func.current_timestamp())
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updated_at = Column(DateTime, server_default=func.current_timestamp(), onupdate=func.current_timestamp())
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__mapper_args__ = {"eager_defaults": True}
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def generate_uuid():
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return str(uuid.uuid4())
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