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https://github.com/maziggy/bambuddy.git
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maziggy
2d9a56b3d0
Queue status update (printing → completed) failed silently when SQLite was locked by another writer, leaving ghost jobs permanently stuck in printing status. Add run_with_retry() for SQLite lock retries and split runtime tracker into per-printer commits to reduce lock hold time.
199 lines
6.6 KiB
Python
199 lines
6.6 KiB
Python
"""Tests for database.run_with_retry — SQLite lock retry logic (#897)."""
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from __future__ import annotations
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from unittest.mock import AsyncMock, patch
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import pytest
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from sqlalchemy.exc import OperationalError
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@pytest.fixture(autouse=True)
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def _force_sqlite():
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"""Make is_sqlite() return True for all tests in this module."""
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with patch("backend.app.core.database.is_sqlite", return_value=True):
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yield
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def _make_locked_error() -> OperationalError:
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"""Create a realistic 'database is locked' OperationalError."""
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return OperationalError(
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statement="UPDATE print_queue SET status=?",
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params=("completed",),
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orig=Exception("database is locked"),
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)
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def _make_other_error() -> OperationalError:
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"""Create a non-lock OperationalError."""
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return OperationalError(
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statement="SELECT 1",
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params=(),
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orig=Exception("no such table: foo"),
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)
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@pytest.mark.asyncio
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async def test_succeeds_on_first_attempt():
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"""Happy path — fn succeeds immediately."""
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from backend.app.core.database import run_with_retry
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mock_fn = AsyncMock(return_value="ok")
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with patch("backend.app.core.database.async_session") as mock_session_factory:
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mock_db = AsyncMock()
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mock_session_factory.return_value.__aenter__ = AsyncMock(return_value=mock_db)
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mock_session_factory.return_value.__aexit__ = AsyncMock(return_value=False)
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result = await run_with_retry(mock_fn, label="test")
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assert result == "ok"
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mock_fn.assert_awaited_once_with(mock_db)
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@pytest.mark.asyncio
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async def test_retries_on_sqlite_locked():
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"""fn fails with 'database is locked' then succeeds on retry."""
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from backend.app.core.database import run_with_retry
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call_count = 0
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async def flaky_fn(db):
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nonlocal call_count
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call_count += 1
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if call_count == 1:
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raise _make_locked_error()
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return "recovered"
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with (
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patch("backend.app.core.database.async_session") as mock_session_factory,
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patch("backend.app.core.database.asyncio.sleep", new_callable=AsyncMock) as mock_sleep,
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):
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mock_db = AsyncMock()
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mock_session_factory.return_value.__aenter__ = AsyncMock(return_value=mock_db)
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mock_session_factory.return_value.__aexit__ = AsyncMock(return_value=False)
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result = await run_with_retry(flaky_fn, label="test")
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assert result == "recovered"
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assert call_count == 2
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mock_sleep.assert_awaited_once_with(0.5) # first retry: 0.5s delay
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@pytest.mark.asyncio
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async def test_raises_after_max_attempts():
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"""fn fails with 'database is locked' on all attempts — raises."""
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from backend.app.core.database import run_with_retry
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async def always_locked(db):
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raise _make_locked_error()
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with (
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patch("backend.app.core.database.async_session") as mock_session_factory,
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patch("backend.app.core.database.asyncio.sleep", new_callable=AsyncMock),
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):
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mock_db = AsyncMock()
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mock_session_factory.return_value.__aenter__ = AsyncMock(return_value=mock_db)
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mock_session_factory.return_value.__aexit__ = AsyncMock(return_value=False)
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with pytest.raises(OperationalError, match="database is locked"):
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await run_with_retry(always_locked, max_attempts=3, label="test")
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@pytest.mark.asyncio
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async def test_non_lock_error_not_retried():
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"""Non-lock OperationalErrors are raised immediately, not retried."""
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from backend.app.core.database import run_with_retry
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call_count = 0
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async def bad_fn(db):
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nonlocal call_count
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call_count += 1
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raise _make_other_error()
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with (
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patch("backend.app.core.database.async_session") as mock_session_factory,
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patch("backend.app.core.database.asyncio.sleep", new_callable=AsyncMock) as mock_sleep,
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):
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mock_db = AsyncMock()
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mock_session_factory.return_value.__aenter__ = AsyncMock(return_value=mock_db)
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mock_session_factory.return_value.__aexit__ = AsyncMock(return_value=False)
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with pytest.raises(OperationalError, match="no such table"):
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await run_with_retry(bad_fn, label="test")
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assert call_count == 1
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mock_sleep.assert_not_awaited()
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@pytest.mark.asyncio
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async def test_backoff_increases():
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"""Retry delays increase: 0.5s, 1.0s, 1.5s."""
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from backend.app.core.database import run_with_retry
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call_count = 0
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async def recovers_on_third(db):
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nonlocal call_count
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call_count += 1
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if call_count < 3:
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raise _make_locked_error()
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return "ok"
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with (
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patch("backend.app.core.database.async_session") as mock_session_factory,
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patch("backend.app.core.database.asyncio.sleep", new_callable=AsyncMock) as mock_sleep,
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):
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mock_db = AsyncMock()
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mock_session_factory.return_value.__aenter__ = AsyncMock(return_value=mock_db)
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mock_session_factory.return_value.__aexit__ = AsyncMock(return_value=False)
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result = await run_with_retry(recovers_on_third, max_attempts=3, label="test")
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assert result == "ok"
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assert call_count == 3
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assert mock_sleep.await_args_list[0].args == (0.5,)
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assert mock_sleep.await_args_list[1].args == (1.0,)
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@pytest.mark.asyncio
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async def test_postgres_no_retry():
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"""On PostgreSQL, fn is called once with no retry logic."""
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from backend.app.core.database import run_with_retry
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mock_fn = AsyncMock(return_value="pg_ok")
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with (
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patch("backend.app.core.database.is_sqlite", return_value=False),
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patch("backend.app.core.database.async_session") as mock_session_factory,
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):
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mock_db = AsyncMock()
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mock_session_factory.return_value.__aenter__ = AsyncMock(return_value=mock_db)
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mock_session_factory.return_value.__aexit__ = AsyncMock(return_value=False)
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result = await run_with_retry(mock_fn, label="test")
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assert result == "pg_ok"
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mock_fn.assert_awaited_once_with(mock_db)
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@pytest.mark.asyncio
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async def test_postgres_error_not_retried():
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"""On PostgreSQL, OperationalErrors are raised immediately."""
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from backend.app.core.database import run_with_retry
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async def bad_fn(db):
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raise _make_locked_error()
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with (
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patch("backend.app.core.database.is_sqlite", return_value=False),
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patch("backend.app.core.database.async_session") as mock_session_factory,
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):
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mock_db = AsyncMock()
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mock_session_factory.return_value.__aenter__ = AsyncMock(return_value=mock_db)
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mock_session_factory.return_value.__aexit__ = AsyncMock(return_value=False)
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with pytest.raises(OperationalError):
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await run_with_retry(bad_fn, label="test")
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