128 lines
5 KiB
Python
128 lines
5 KiB
Python
from .common import assert_subpackage; assert_subpackage(__name__)
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from contextlib import contextmanager
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from pathlib import Path
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import shutil
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import sqlite3
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from tempfile import TemporaryDirectory
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from typing import Tuple, Any, Iterator, Callable, Optional, Union, Literal
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from .common import PathIsh, assert_never
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def sqlite_connect_immutable(db: PathIsh) -> sqlite3.Connection:
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return sqlite3.connect(f'file:{db}?immutable=1', uri=True)
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def test_sqlite_connect_immutable(tmp_path: Path) -> None:
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db = str(tmp_path / 'db.sqlite')
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with sqlite3.connect(db) as conn:
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conn.execute('CREATE TABLE testtable (col)')
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import pytest
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with pytest.raises(sqlite3.OperationalError, match='readonly database'):
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with sqlite_connect_immutable(db) as conn:
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conn.execute('DROP TABLE testtable')
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# succeeds without immutable
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with sqlite3.connect(db) as conn:
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conn.execute('DROP TABLE testtable')
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SqliteRowFactory = Callable[[sqlite3.Cursor, sqlite3.Row], Any]
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def dict_factory(cursor, row):
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fields = [column[0] for column in cursor.description]
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return {key: value for key, value in zip(fields, row)}
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Factory = Union[SqliteRowFactory, Literal['row', 'dict']]
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@contextmanager
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def sqlite_connection(db: PathIsh, *, immutable: bool=False, row_factory: Optional[Factory]=None) -> Iterator[sqlite3.Connection]:
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dbp = f'file:{db}'
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# https://www.sqlite.org/draft/uri.html#uriimmutable
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if immutable:
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# assert results in nicer error than sqlite3.OperationalError
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assert Path(db).exists(), db
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dbp = f'{dbp}?immutable=1'
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row_factory_: Any = None
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if row_factory is not None:
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if callable(row_factory):
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row_factory_ = row_factory
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elif row_factory == 'row':
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row_factory_ = sqlite3.Row
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elif row_factory == 'dict':
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row_factory_ = dict_factory
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else:
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assert_never()
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conn = sqlite3.connect(dbp, uri=True)
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try:
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conn.row_factory = row_factory_
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with conn:
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yield conn
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finally:
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# Connection context manager isn't actually closing the connection, only keeps transaction
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conn.close()
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# TODO come up with a better name?
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# NOTE: this is tested by tests/sqlite.py::test_sqlite_read_with_wal
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def sqlite_copy_and_open(db: PathIsh) -> sqlite3.Connection:
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"""
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'Snapshots' database and opens by making a deep copy of it including journal/WAL files
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"""
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dp = Path(db)
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# TODO make atomic/check mtimes or something
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dest = sqlite3.connect(':memory:')
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with TemporaryDirectory() as td:
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tdir = Path(td)
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# shm should be recreated from scratch -- safer not to copy perhaps
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tocopy = [dp] + [p for p in dp.parent.glob(dp.name + '-*') if not p.name.endswith('-shm')]
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for p in tocopy:
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shutil.copy(p, tdir / p.name)
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with sqlite3.connect(str(tdir / dp.name)) as conn:
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conn.backup(target=dest)
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conn.close()
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return dest
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# NOTE hmm, so this kinda works
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# V = TypeVar('V', bound=Tuple[Any, ...])
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# def select(cols: V, rest: str, *, db: sqlite3.Connection) -> Iterator[V]:
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# but sadly when we pass columns (Tuple[str, ...]), it seems to bind this type to V?
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# and then the return type ends up as Iterator[Tuple[str, ...]], which isn't desirable :(
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# a bit annoying to have this copy-pasting, but hopefully not a big issue
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from typing import overload
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@overload
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def select(cols: Tuple[str ], rest: str, *, db: sqlite3.Connection) -> \
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Iterator[Tuple[Any ]]: ...
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@overload
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def select(cols: Tuple[str, str ], rest: str, *, db: sqlite3.Connection) -> \
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Iterator[Tuple[Any, Any ]]: ...
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@overload
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def select(cols: Tuple[str, str, str ], rest: str, *, db: sqlite3.Connection) -> \
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Iterator[Tuple[Any, Any, Any ]]: ...
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@overload
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def select(cols: Tuple[str, str, str, str ], rest: str, *, db: sqlite3.Connection) -> \
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Iterator[Tuple[Any, Any, Any, Any ]]: ...
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@overload
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def select(cols: Tuple[str, str, str, str, str ], rest: str, *, db: sqlite3.Connection) -> \
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Iterator[Tuple[Any, Any, Any, Any, Any ]]: ...
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@overload
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def select(cols: Tuple[str, str, str, str, str, str ], rest: str, *, db: sqlite3.Connection) -> \
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Iterator[Tuple[Any, Any, Any, Any, Any, Any ]]: ...
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@overload
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def select(cols: Tuple[str, str, str, str, str, str, str ], rest: str, *, db: sqlite3.Connection) -> \
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Iterator[Tuple[Any, Any, Any, Any, Any, Any, Any ]]: ...
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@overload
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def select(cols: Tuple[str, str, str, str, str, str, str, str], rest: str, *, db: sqlite3.Connection) -> \
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Iterator[Tuple[Any, Any, Any, Any, Any, Any, Any, Any]]: ...
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def select(cols, rest, *, db):
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# db arg is last cause that results in nicer code formatting..
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return db.execute('SELECT ' + ','.join(cols) + ' ' + rest)
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