62 lines
2.3 KiB
Python
62 lines
2.3 KiB
Python
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 my.core.sqlite import sqlite_connect_immutable, sqlite_copy_and_open
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def test_sqlite_read_with_wal(tmp_path: Path) -> None:
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db = tmp_path / 'db.sqlite'
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# write a bit
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with sqlite3.connect(str(db)) as conn:
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conn.execute('CREATE TABLE testtable (col)')
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for i in range(5):
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conn.execute('INSERT INTO testtable (col) VALUES (?)', str(i))
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# write more in WAL mode
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with sqlite3.connect(str(db)) as conn_db:
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conn.execute('PRAGMA journal_mode=wal;')
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for i in range(5, 10):
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conn_db.execute('INSERT INTO testtable (col) VALUES (?)', str(i))
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conn_db.execute('COMMIT')
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# make sure it has unflushed stuff in wal
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wals = list(db.parent.glob('*-wal'))
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assert len(wals) == 1
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## now run the tests in separate process to ensure there is no potential for reusing sqlite connections or something
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from concurrent.futures import ProcessPoolExecutor as Pool
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with Pool(1) as pool:
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# merely using it for ctx manager..
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pool.submit(_test_do_copy , db).result()
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pool.submit(_test_do_immutable , db).result()
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pool.submit(_test_do_copy_and_open, db).result()
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pool.submit(_test_open_asis , db).result()
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def _test_do_copy(db: Path) -> None:
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# from a copy without journal can only read previously committed stuff
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with TemporaryDirectory() as tdir:
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cdb = Path(tdir) / 'dbcopy.sqlite'
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shutil.copy(db, cdb)
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with sqlite3.connect(str(cdb)) as conn_copy:
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assert len(list(conn_copy.execute('SELECT * FROM testtable'))) == 5
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def _test_do_immutable(db: Path) -> None:
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# in readonly mode doesn't touch
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with sqlite_connect_immutable(db) as conn_imm:
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assert len(list(conn_imm.execute('SELECT * FROM testtable'))) == 5
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def _test_do_copy_and_open(db: Path) -> None:
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with sqlite_copy_and_open(db) as conn_mem:
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assert len(list(conn_mem.execute('SELECT * FROM testtable'))) == 10
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def _test_open_asis(db: Path) -> None:
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# NOTE: this also works... but leaves some potential for DB corruption
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with sqlite3.connect(str(db)) as conn_db_2:
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assert len(list(conn_db_2.execute('SELECT * FROM testtable'))) == 10
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