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database.py
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database.py
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# -*- coding: utf-8 -*-
#
# Copyright 2018-2021 - Swiss Data Science Center (SDSC)
# A partnership between École Polytechnique Fédérale de Lausanne (EPFL) and
# Eidgenössische Technische Hochschule Zürich (ETHZ).
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Command builder for local object database."""
from renku.core.incubation.database import Database
from renku.core.management.command_builder.command import Command, CommandResult, check_finalized
class DatabaseCommand(Command):
"""Builder to get a database connection."""
PRE_ORDER = 4
POST_ORDER = 5
def __init__(self, builder: Command, write: bool = False, path: str = None) -> None:
self._builder = builder
self._write = write
self._path = path
def _pre_hook(self, builder: Command, context: dict, *args, **kwargs) -> None:
"""Create a Database singleton."""
if "client" not in context:
raise ValueError("Commit builder needs a LocalClient to be set.")
client = context["client"]
self.database = Database.from_path(path=self._path or client.database_path)
context["bindings"][Database] = self.database
def _post_hook(self, builder: Command, context: dict, result: CommandResult, *args, **kwargs) -> None:
if self._write and not result.error:
self.database.commit()
@check_finalized
def build(self) -> Command:
"""Build the command."""
self._builder.add_pre_hook(self.PRE_ORDER, self._pre_hook)
self._builder.add_post_hook(self.POST_ORDER, self._post_hook)
return self._builder.build()