def test_concurrent_tx_sees_original_value_on_delete(self, keyfs):
D = keyfs.add_key("NAME", "hello", dict)
with keyfs.transaction(write=True):
D.set({1:2})
tx_1 = Transaction(keyfs, write=True)
tx_2 = Transaction(keyfs)
tx_1.delete(D)
tx_1.commit()
assert tx_2.get(D) == {1:2}
def test_concurrent_tx_sees_original_value_on_write(self, keyfs):
D = keyfs.add_key("NAME", "hello", dict)
tx_1 = Transaction(keyfs, write=True)
tx_2 = Transaction(keyfs)
ser = tx_1.conn.last_changelog_serial + 1
tx_1.set(D, {1:1})
tx1_serial = tx_1.commit()
assert tx1_serial == ser
assert tx_2.at_serial == ser - 1
with keyfs._storage.get_connection() as conn:
assert conn.last_changelog_serial == ser
assert D not in tx_2.cache and D not in tx_2.dirty
assert tx_2.get(D) == {}
def test_cannot_write_on_read_trans(self, keyfs):
key = keyfs.add_key("hello", "hello", dict)
tx_1 = Transaction(keyfs)
with pytest.raises(keyfs.ReadOnly):
tx_1.set(key, {})
with pytest.raises(keyfs.ReadOnly):
tx_1.delete(key)
def test_at_serial_restart(self, keyfs):
key = keyfs.add_key("hello", "hello", dict)
with keyfs.transaction() as txr:
tx = Transaction(keyfs, write=True)
tx.set(key, {1:1})
tx.commit()
keyfs.restart_read_transaction()
assert txr.commit_serial is None
assert txr.at_serial == 0