64 lines
2.2 KiB
Python
64 lines
2.2 KiB
Python
# Copyright 2015, 2016 OpenMarket Ltd
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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 typing import Any, Mapping, NoReturn
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from ._base import BaseDatabaseEngine, IncorrectDatabaseSetup
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# The classes `PostgresEngine` and `Sqlite3Engine` must always be importable, because
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# we use `isinstance(engine, PostgresEngine)` to write different queries for postgres
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# and sqlite. But the database driver modules are both optional: they may not be
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# installed. To account for this, create dummy classes on import failure so we can
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# still run `isinstance()` checks.
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try:
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from .postgres import PostgresEngine
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except ImportError:
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class PostgresEngine(BaseDatabaseEngine): # type: ignore[no-redef]
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def __new__(cls, *args: object, **kwargs: object) -> NoReturn:
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raise RuntimeError(
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f"Cannot create {cls.__name__} -- psycopg2 module is not installed"
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)
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try:
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from .sqlite import Sqlite3Engine
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except ImportError:
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class Sqlite3Engine(BaseDatabaseEngine): # type: ignore[no-redef]
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def __new__(cls, *args: object, **kwargs: object) -> NoReturn:
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raise RuntimeError(
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f"Cannot create {cls.__name__} -- sqlite3 module is not installed"
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)
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def create_engine(database_config: Mapping[str, Any]) -> BaseDatabaseEngine:
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name = database_config["name"]
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if name == "sqlite3":
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return Sqlite3Engine(database_config)
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if name == "psycopg2":
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return PostgresEngine(database_config)
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raise RuntimeError("Unsupported database engine '%s'" % (name,))
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__all__ = [
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"create_engine",
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"BaseDatabaseEngine",
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"PostgresEngine",
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"Sqlite3Engine",
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"IncorrectDatabaseSetup",
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]
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