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Rename PostgresBackend to AsyncpgBackend
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ansipunk
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Mar 2, 2024
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,118 @@ | ||
| import typing | ||
| from collections.abc import Sequence | ||
|
|
||
| import psycopg_pool | ||
| from sqlalchemy.sql import ClauseElement | ||
|
|
||
| from databases.backends.dialects.psycopg import get_dialect | ||
| from databases.core import DatabaseURL | ||
| from databases.interfaces import ( | ||
| ConnectionBackend, | ||
| DatabaseBackend, | ||
| TransactionBackend, | ||
| ) | ||
|
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||
|
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| class PsycopgBackend(DatabaseBackend): | ||
| def __init__( | ||
| self, database_url: typing.Union[DatabaseURL, str], **options: typing.Any | ||
| ) -> None: | ||
| self._database_url = DatabaseURL(database_url) | ||
| self._options = options | ||
| self._dialect = get_dialect() | ||
| self._pool: typing.Optional[psycopg_pool.AsyncConnectionPool] = None | ||
|
|
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| async def connect(self) -> None: | ||
| if self._pool is not None: | ||
| return | ||
|
|
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| self._pool = psycopg_pool.AsyncConnectionPool( | ||
| self._database_url.url, open=False, **self._options) | ||
| await self._pool.open() | ||
|
|
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| async def disconnect(self) -> None: | ||
| if self._pool is None: | ||
| return | ||
|
|
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| await self._pool.close() | ||
| self._pool = None | ||
|
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| def connection(self) -> "PsycopgConnection": | ||
| return PsycopgConnection(self) | ||
|
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|
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| class PsycopgConnection(ConnectionBackend): | ||
| def __init__(self, database: PsycopgBackend) -> None: | ||
| self._database = database | ||
|
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| async def acquire(self) -> None: | ||
| if self._connection is not None: | ||
| return | ||
|
|
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| if self._database._pool is None: | ||
| raise RuntimeError("PsycopgBackend is not running") | ||
|
|
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| # TODO: Add configurable timeouts | ||
| self._connection = await self._database._pool.getconn() | ||
|
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| async def release(self) -> None: | ||
| if self._connection is None: | ||
| return | ||
|
|
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| await self._database._pool.putconn(self._connection) | ||
| self._connection = None | ||
|
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| async def fetch_all(self, query: ClauseElement) -> typing.List["Record"]: | ||
| raise NotImplementedError() # pragma: no cover | ||
|
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| async def fetch_one(self, query: ClauseElement) -> typing.Optional["Record"]: | ||
| raise NotImplementedError() # pragma: no cover | ||
|
|
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| async def fetch_val( | ||
| self, query: ClauseElement, column: typing.Any = 0 | ||
| ) -> typing.Any: | ||
| row = await self.fetch_one(query) | ||
| return None if row is None else row[column] | ||
|
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| async def execute(self, query: ClauseElement) -> typing.Any: | ||
| raise NotImplementedError() # pragma: no cover | ||
|
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| async def execute_many(self, queries: typing.List[ClauseElement]) -> None: | ||
| raise NotImplementedError() # pragma: no cover | ||
|
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| async def iterate( | ||
| self, query: ClauseElement | ||
| ) -> typing.AsyncGenerator[typing.Mapping, None]: | ||
| raise NotImplementedError() # pragma: no cover | ||
| # mypy needs async iterators to contain a `yield` | ||
| # https://github.com/python/mypy/issues/5385#issuecomment-407281656 | ||
| yield True # pragma: no cover | ||
|
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| def transaction(self) -> "TransactionBackend": | ||
| raise NotImplementedError() # pragma: no cover | ||
|
|
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| @property | ||
| def raw_connection(self) -> typing.Any: | ||
| raise NotImplementedError() # pragma: no cover | ||
|
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|
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| class PsycopgTransaction(TransactionBackend): | ||
| async def start( | ||
| self, is_root: bool, extra_options: typing.Dict[typing.Any, typing.Any] | ||
| ) -> None: | ||
| raise NotImplementedError() # pragma: no cover | ||
|
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| async def commit(self) -> None: | ||
| raise NotImplementedError() # pragma: no cover | ||
|
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| async def rollback(self) -> None: | ||
| raise NotImplementedError() # pragma: no cover | ||
|
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|
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| class Record(Sequence): | ||
| @property | ||
| def _mapping(self) -> typing.Mapping: | ||
| raise NotImplementedError() # pragma: no cover | ||
|
|
||
| def __getitem__(self, key: typing.Any) -> typing.Any: | ||
| raise NotImplementedError() # pragma: no cover |
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