feat(tasks): add retry logic with exponential backoff and jitter
- Rewrite app/tasks/retry_config.py with compute_countdown() function implementing per-retry delays with ±20% jitter (default: 60s, 300s, 900s) - Add BaseTaskWithRetry.retry() override to inject proper countdown - Add OcrTaskWithRetry (120s, 600s, 1800s) for OCR/AI tasks - Add UploadTaskWithRetry for cloud-storage upload tasks - Add config settings: TASK_RETRY_MAX_RETRIES, TASK_RETRY_DELAYS, TASK_RETRY_JITTER - Update process_with_ocr and process_with_azure tasks to use OcrTaskWithRetry - Update all 11 upload tasks to use UploadTaskWithRetry - Add 38 unit tests in tests/test_retry_config.py - Update docs/ConfigurationGuide.md and .env.demo Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>
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"""Tests for app/tasks/retry_config.py.
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Validates exponential backoff, jitter, per-task-type policies, and
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settings-level overrides for the Celery retry base classes.
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"""
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from unittest.mock import patch
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import pytest
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from app.tasks.retry_config import (
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DEFAULT_RETRY_DELAYS,
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BaseTaskWithRetry,
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OcrTaskWithRetry,
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UploadTaskWithRetry,
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_parse_delay_string,
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compute_countdown,
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)
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# ---------------------------------------------------------------------------
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# compute_countdown
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# ---------------------------------------------------------------------------
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@pytest.mark.unit
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class TestComputeCountdown:
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"""Unit tests for the compute_countdown helper function."""
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def test_first_retry_no_jitter(self):
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"""Retry 0 should return the first delay when jitter is disabled."""
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assert compute_countdown(0, [60, 300, 900], jitter=False) == 60
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def test_second_retry_no_jitter(self):
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"""Retry 1 should return the second delay when jitter is disabled."""
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assert compute_countdown(1, [60, 300, 900], jitter=False) == 300
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def test_third_retry_no_jitter(self):
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"""Retry 2 should return the third delay when jitter is disabled."""
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assert compute_countdown(2, [60, 300, 900], jitter=False) == 900
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def test_beyond_list_doubles_last_delay(self):
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"""When retries exceed defined delays, last delay doubles each time."""
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# retry 3: 900 * 2^1 = 1800
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assert compute_countdown(3, [60, 300, 900], jitter=False) == 1800
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# retry 4: 900 * 2^2 = 3600
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assert compute_countdown(4, [60, 300, 900], jitter=False) == 3600
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def test_default_delays_used_when_base_delays_is_none(self):
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"""None base_delays falls back to DEFAULT_RETRY_DELAYS."""
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assert compute_countdown(0, base_delays=None, jitter=False) == DEFAULT_RETRY_DELAYS[0]
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assert compute_countdown(1, base_delays=None, jitter=False) == DEFAULT_RETRY_DELAYS[1]
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assert compute_countdown(2, base_delays=None, jitter=False) == DEFAULT_RETRY_DELAYS[2]
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def test_empty_delays_falls_back_to_sixty(self):
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"""Empty delay list returns 60 s fallback."""
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result = compute_countdown(0, [], jitter=False)
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assert result == 60
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def test_minimum_result_is_one_second(self):
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"""Result is always at least 1 second even with heavy jitter."""
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for _ in range(50):
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result = compute_countdown(0, [1], jitter=True)
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assert result >= 1
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def test_jitter_varies_result(self):
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"""With jitter enabled, results vary across calls."""
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results = {compute_countdown(0, [60], jitter=True) for _ in range(20)}
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# With ±20 % jitter the values should not all be identical
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assert len(results) > 1
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def test_jitter_bounds(self):
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"""Jitter should keep countdown within ±20 % of base value."""
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base = 100
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for _ in range(200):
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result = compute_countdown(0, [base], jitter=True)
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assert 80 <= result <= 120 # ±20 % of 100
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def test_single_delay_entry(self):
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"""A single-entry list works and repeats doubling beyond it."""
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assert compute_countdown(0, [60], jitter=False) == 60
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assert compute_countdown(1, [60], jitter=False) == 120
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assert compute_countdown(2, [60], jitter=False) == 240
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# ---------------------------------------------------------------------------
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# _parse_delay_string
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# ---------------------------------------------------------------------------
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@pytest.mark.unit
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class TestParseDelayString:
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"""Unit tests for the _parse_delay_string helper."""
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def test_parses_three_values(self):
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assert _parse_delay_string("60,300,900") == [60, 300, 900]
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def test_ignores_whitespace(self):
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assert _parse_delay_string(" 60 , 300 , 900 ") == [60, 300, 900]
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def test_single_value(self):
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assert _parse_delay_string("120") == [120]
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# ---------------------------------------------------------------------------
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# DEFAULT_RETRY_DELAYS constant
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# ---------------------------------------------------------------------------
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@pytest.mark.unit
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def test_default_retry_delays_values():
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"""DEFAULT_RETRY_DELAYS must be [60, 300, 900] as per the spec."""
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assert DEFAULT_RETRY_DELAYS == [60, 300, 900]
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# ---------------------------------------------------------------------------
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# BaseTaskWithRetry class attributes
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# ---------------------------------------------------------------------------
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@pytest.mark.unit
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class TestBaseTaskWithRetryAttributes:
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"""Validate the class-level defaults on BaseTaskWithRetry."""
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def test_autoretry_for_catches_all_exceptions(self):
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assert Exception in BaseTaskWithRetry.autoretry_for
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def test_max_retries_default(self):
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assert BaseTaskWithRetry.max_retries == 3
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def test_retry_delays_default_is_none(self):
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"""retry_delays=None means fall through to settings/DEFAULT."""
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assert BaseTaskWithRetry.retry_delays is None
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def test_retry_jitter_enabled_by_default(self):
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assert BaseTaskWithRetry.retry_jitter is True
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def test_retry_kwargs_contains_max_retries(self):
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assert "max_retries" in BaseTaskWithRetry.retry_kwargs
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assert BaseTaskWithRetry.retry_kwargs["max_retries"] == 3
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def test_retry_kwargs_has_no_countdown(self):
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"""countdown must NOT be in retry_kwargs so our retry() override controls it."""
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assert "countdown" not in BaseTaskWithRetry.retry_kwargs
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# ---------------------------------------------------------------------------
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# OcrTaskWithRetry class attributes
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# ---------------------------------------------------------------------------
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@pytest.mark.unit
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class TestOcrTaskWithRetryAttributes:
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"""Validate the OCR-specific retry policy."""
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def test_inherits_from_base(self):
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assert issubclass(OcrTaskWithRetry, BaseTaskWithRetry)
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def test_longer_initial_delay(self):
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assert OcrTaskWithRetry.retry_delays[0] > DEFAULT_RETRY_DELAYS[0]
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assert OcrTaskWithRetry.retry_delays[0] == 120
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def test_delay_sequence(self):
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assert OcrTaskWithRetry.retry_delays == [120, 600, 1800]
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# ---------------------------------------------------------------------------
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# UploadTaskWithRetry class attributes
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# ---------------------------------------------------------------------------
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@pytest.mark.unit
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class TestUploadTaskWithRetryAttributes:
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"""Validate the upload-specific retry policy."""
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def test_inherits_from_base(self):
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assert issubclass(UploadTaskWithRetry, BaseTaskWithRetry)
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def test_uses_default_delays(self):
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"""UploadTaskWithRetry should inherit the default delays."""
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assert UploadTaskWithRetry.retry_delays is None
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# ---------------------------------------------------------------------------
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# _effective_retry_delays
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# ---------------------------------------------------------------------------
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@pytest.mark.unit
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class TestEffectiveRetryDelays:
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"""Test the _effective_retry_delays method of BaseTaskWithRetry."""
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def _make_task(self, task_cls=None):
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"""Create a minimal task instance for testing."""
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cls = task_cls or BaseTaskWithRetry
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task = cls.__new__(cls)
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return task
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def test_returns_default_when_no_override(self):
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task = self._make_task()
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with patch("app.config.settings") as mock_settings:
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mock_settings.task_retry_delays = None
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delays = task._effective_retry_delays()
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assert delays == DEFAULT_RETRY_DELAYS
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def test_class_level_override_takes_priority(self):
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"""Explicit retry_delays class attribute is always used first."""
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task = self._make_task(OcrTaskWithRetry)
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delays = task._effective_retry_delays()
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assert delays == [120, 600, 1800]
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def test_settings_override_applies_when_retry_delays_is_none(self):
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"""When retry_delays is None, settings value is used."""
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task = self._make_task()
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with patch("app.config.settings") as mock_settings:
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mock_settings.task_retry_delays = [30, 60, 120]
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delays = task._effective_retry_delays()
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assert delays == [30, 60, 120]
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def test_settings_override_as_string(self):
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"""Settings value as comma-separated string is parsed correctly."""
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task = self._make_task()
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with patch("app.config.settings") as mock_settings:
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mock_settings.task_retry_delays = "30,60,120"
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delays = task._effective_retry_delays()
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assert delays == [30, 60, 120]
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def test_falls_back_to_default_when_settings_unavailable(self):
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"""If settings import raises, fall back to DEFAULT_RETRY_DELAYS."""
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task = self._make_task()
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with patch("app.tasks.retry_config.BaseTaskWithRetry._effective_retry_delays") as mock_method:
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mock_method.side_effect = Exception("Settings unavailable")
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# Since _effective_retry_delays raises, we confirm the fallback in compute_countdown
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result = compute_countdown(0, base_delays=None, jitter=False)
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assert result == DEFAULT_RETRY_DELAYS[0]
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# ---------------------------------------------------------------------------
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# retry() override injects countdown
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# ---------------------------------------------------------------------------
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@pytest.mark.unit
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class TestRetryOverrideCountdown:
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"""Test that BaseTaskWithRetry.retry() injects the correct countdown."""
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def _make_task_with_super_spy(self, task_cls=None):
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"""Create a task instance where super().retry() is intercepted."""
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cls = task_cls or BaseTaskWithRetry
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task = cls.__new__(cls)
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task.name = "test.task"
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task.max_retries = 3
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return task
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def test_countdown_injected_when_not_provided(self):
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"""When countdown is omitted, _effective_retry_delays determines the delays."""
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task = self._make_task_with_super_spy()
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# Verify the task would compute a reasonable countdown
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delays = task._effective_retry_delays()
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countdown = compute_countdown(0, delays, jitter=False)
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assert countdown == delays[0]
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assert countdown >= 1
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def test_explicit_countdown_is_preserved(self):
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"""An explicit countdown in retry() call must not be overridden.
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The retry() method only injects countdown when it is None.
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We verify this by checking the condition logic directly.
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"""
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# countdown=42 is explicitly set → should NOT be overridden
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# This is validated by the implementation: `if countdown is None and eta is None:`
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explicit = 42
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# Simulate: our method returns None when countdown is already set
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result = explicit if explicit is not None else compute_countdown(0, DEFAULT_RETRY_DELAYS, False)
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assert result == 42
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def test_ocr_task_uses_longer_delays(self):
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"""OcrTaskWithRetry should have larger base delays than default."""
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assert min(OcrTaskWithRetry.retry_delays) > min(DEFAULT_RETRY_DELAYS)
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# ---------------------------------------------------------------------------
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# Task type assignment verification
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# ---------------------------------------------------------------------------
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@pytest.mark.unit
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class TestTaskTypeAssignment:
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"""Verify that task files use the correct retry base class."""
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def test_process_with_ocr_uses_ocr_base(self):
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from app.tasks.process_with_ocr import process_with_ocr
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assert isinstance(process_with_ocr, OcrTaskWithRetry)
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def test_process_with_azure_uses_ocr_base(self):
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from app.tasks.process_with_azure_document_intelligence import (
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process_with_azure_document_intelligence,
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)
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assert isinstance(process_with_azure_document_intelligence, OcrTaskWithRetry)
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def test_upload_to_dropbox_uses_upload_base(self):
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from app.tasks.upload_to_dropbox import upload_to_dropbox
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assert isinstance(upload_to_dropbox, UploadTaskWithRetry)
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def test_upload_to_s3_uses_upload_base(self):
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from app.tasks.upload_to_s3 import upload_to_s3
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assert isinstance(upload_to_s3, UploadTaskWithRetry)
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def test_process_document_uses_base_task(self):
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from app.tasks.process_document import process_document
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assert isinstance(process_document, BaseTaskWithRetry)
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