import unittest from io import BytesIO from types import SimpleNamespace from unittest.mock import Mock, patch from PIL import Image from app.ports.image_gen import ImageResult, TaskStatus from app.tasks import memoir_tasks from app.tasks.memoir_tasks import generate_chapter_images def _mock_image_generator(*, image_url: str = "https://provider.example.com/1.png", image_bytes: bytes | None = None): """构造满足 port ImageGenerator 的 mock：generate 返回 ImageResult，download_image 返回 bytes。""" if image_bytes is None: buf = BytesIO() Image.new("RGB", (1, 1), color="white").save(buf, format="PNG") image_bytes = buf.getvalue() gen = Mock() gen.generate.return_value = ImageResult( status=TaskStatus.COMPLETED, task_id="", image_url=image_url, ) gen.download_image.return_value = image_bytes return gen def _section_image_record(img_dict): """把图片 dict 转成 image_record 用的 SimpleNamespace（可被任务更新属性）。""" d = dict(img_dict or {}) return SimpleNamespace( order_index=d.get("index", 0), placeholder=d.get("placeholder"), description=d.get("description"), status=d.get("status"), prompt=d.get("prompt"), url=d.get("url"), storage_key=d.get("storage_key"), provider=d.get("provider"), style=d.get("style"), size=d.get("size"), error=d.get("error"), retryable=d.get("retryable"), created_at=d.get("created_at"), updated_at=d.get("updated_at"), ) def _chapter_with_sections(sections_data): """构造带 sections 的 chapter stub，供 generate_chapter_images 使用（任务从 section.image_record 读/写）。""" sections = [] for i, d in enumerate(sections_data): img = d.get("image") if img: rec = _section_image_record(img) sec = SimpleNamespace( content=d.get("content", ""), image_id="img-%s-%s" % (i, id(rec)), image_record=rec, order_index=d.get("order_index", i), ) else: sec = SimpleNamespace( content=d.get("content", ""), image_id=None, image_record=None, order_index=d.get("order_index", i), ) sections.append(sec) return SimpleNamespace( id="chapter-1", user_id="user-1", title="童年的夏天", category="childhood", cover_image=None, images=[], sections=sections, ) def _bind_db_execute_to_chapter(db_mock, chapter): """让 db.execute(select(...)).unique().scalar_one_or_none() 返回 chapter。""" db_mock.execute.return_value.unique.return_value.scalar_one_or_none.return_value = chapter class GenerateChapterImagesTaskTest(unittest.TestCase): def setUp(self): memoir_tasks._REDIS_CLIENTS.clear() @patch("app.tasks.memoir_tasks.redis.from_url") @patch("app.tasks.memoir_tasks.get_sync_db") @patch("app.tasks.memoir_tasks.TencentCosStorageService") @patch("app.tasks.memoir_tasks.get_image_generator") @patch("app.tasks.memoir_tasks.MemoirImagePromptService") def test_generate_chapter_images_skips_when_lock_is_already_held( self, prompt_service_cls, get_image_generator_mock, storage_cls, get_sync_db_mock, redis_from_url, ): chapter = _chapter_with_sections([ {"content": "那条路我一直记得。", "image": {"index": 0, "placeholder": "{{{{IMAGE:南方小镇的青石板路}}}}", "description": "南方小镇的青石板路", "status": "pending", "url": None}}, ]) db = Mock() _bind_db_execute_to_chapter(db, chapter) get_sync_db_mock.return_value.__enter__.return_value = db get_sync_db_mock.return_value.__exit__.return_value = False redis_from_url.return_value.set.return_value = False result = generate_chapter_images.run("chapter-1") self.assertEqual(result, {"status": "locked"}) get_image_generator_mock.return_value.generate.assert_not_called() storage_cls.from_env.return_value.upload_bytes.assert_not_called() db.commit.assert_not_called() @patch("app.tasks.memoir_tasks.get_sync_db") @patch("app.tasks.memoir_tasks.TencentCosStorageService") @patch("app.tasks.memoir_tasks.get_image_generator") @patch("app.tasks.memoir_tasks.MemoirImagePromptService") @patch("app.tasks.memoir_tasks._release_chapter_image_lock") @patch("app.tasks.memoir_tasks._acquire_chapter_image_lock", return_value=True) def test_generate_chapter_images_retries_when_any_item_generation_fails( self, _acquire_lock_mock, _release_lock_mock, prompt_service_cls, get_image_generator_mock, storage_cls, get_sync_db_mock, ): chapter = _chapter_with_sections([ {"content": "那条路我一直记得。", "image": {"index": 0, "placeholder": "{{{{IMAGE:南方小镇的青石板路}}}}", "description": "南方小镇的青石板路", "status": "pending", "url": None}}, ]) db = Mock() _bind_db_execute_to_chapter(db, chapter) get_sync_db_mock.return_value.__enter__.return_value = db get_sync_db_mock.return_value.__exit__.return_value = False prompt_service_cls.return_value.build_prompt.return_value = { "prompt": "A serene southern China town", "style": "watercolor", "size": "1024x1024", "prompt_context": "childhood: 童年的夏天", } get_image_generator_mock.return_value.generate.side_effect = RuntimeError("transient provider error") retry_error = RuntimeError("retry requested") task_self = SimpleNamespace(request=SimpleNamespace(id="task-1"), retry=Mock(side_effect=retry_error)) with self.assertRaises(RuntimeError) as ctx: generate_chapter_images.run.__func__(task_self, "chapter-1") self.assertIs(ctx.exception, retry_error) self.assertEqual(chapter.sections[0].image_record.status, "failed") self.assertEqual(chapter.sections[0].image_record.error, "transient provider error") task_self.retry.assert_called_once() storage_cls.from_env.return_value.upload_bytes.assert_not_called() @patch("app.tasks.memoir_tasks.get_sync_db") @patch("app.tasks.memoir_tasks.TencentCosStorageService") @patch("app.tasks.memoir_tasks.get_image_generator") @patch("app.tasks.memoir_tasks.MemoirImagePromptService") @patch("app.tasks.memoir_tasks._release_chapter_image_lock") @patch("app.tasks.memoir_tasks._acquire_chapter_image_lock", return_value=True) def test_generate_chapter_images_marks_successful_item_completed( self, _acquire_lock_mock, _release_lock_mock, prompt_service_cls, get_image_generator_mock, storage_cls, get_sync_db_mock, ): chapter = _chapter_with_sections([ {"content": "那条路我一直记得。", "image": {"index": 0, "placeholder": "{{{{IMAGE:南方小镇的青石板路}}}}", "description": "南方小镇的青石板路", "status": "pending", "url": None}}, ]) db = Mock() _bind_db_execute_to_chapter(db, chapter) get_sync_db_mock.return_value.__enter__.return_value = db get_sync_db_mock.return_value.__exit__.return_value = False prompt_service_cls.return_value.build_prompt.return_value = { "prompt": "A serene southern China town", "style": "watercolor", "size": "1024x1024", "prompt_context": "childhood: 童年的夏天", } get_image_generator_mock.return_value = _mock_image_generator() storage_inst = storage_cls.from_env.return_value storage_inst.upload_bytes.return_value = "https://cos.example.com/memoirs/u1/c1/0.png" generate_chapter_images.run("chapter-1") self.assertEqual(chapter.sections[0].image_record.status, "completed") self.assertEqual(chapter.sections[0].image_record.storage_key, "memoirs/user-1/chapter-1/0-7e1f860790.png") self.assertEqual(chapter.sections[0].image_record.url, "https://cos.example.com/memoirs/u1/c1/0.png") self.assertEqual(chapter.sections[0].image_record.prompt, "A serene southern China town") get_image_generator_mock.return_value.generate.assert_called_once() db.commit.assert_called() @patch("app.tasks.memoir_tasks.get_sync_db") @patch("app.tasks.memoir_tasks.TencentCosStorageService") @patch("app.tasks.memoir_tasks.get_image_generator") @patch("app.tasks.memoir_tasks.MemoirImagePromptService") @patch("app.tasks.memoir_tasks.MemoirImageSettings.from_env") def test_generate_chapter_images_returns_disabled_when_feature_flag_is_off( self, settings_from_env, prompt_service_cls, get_image_generator_mock, storage_cls, get_sync_db_mock, ): chapter = _chapter_with_sections([ {"content": "那条路我一直记得。", "image": {"index": 0, "placeholder": "{{{{IMAGE:南方小镇的青石板路}}}}", "description": "南方小镇的青石板路", "status": "pending", "url": None}}, ]) settings_from_env.return_value = SimpleNamespace( enabled=False, max_per_chapter=2, provider="liblib", default_style="watercolor", default_size="1024x1024", poll_interval_seconds=3, max_attempts=20, liblib_template_uuid="tpl-uuid", ) db = Mock() _bind_db_execute_to_chapter(db, chapter) get_sync_db_mock.return_value.__enter__.return_value = db get_sync_db_mock.return_value.__exit__.return_value = False result = generate_chapter_images.run("chapter-1") self.assertEqual(result, {"status": "disabled"}) prompt_service_cls.assert_not_called() get_image_generator_mock.assert_not_called() storage_cls.from_env.return_value.upload_bytes.assert_not_called() db.commit.assert_not_called() @patch("app.tasks.memoir_tasks.get_sync_db") @patch("app.tasks.memoir_tasks.TencentCosStorageService") @patch("app.tasks.memoir_tasks.get_image_generator") @patch("app.tasks.memoir_tasks.MemoirImagePromptService") @patch("app.tasks.memoir_tasks._release_chapter_image_lock") @patch("app.tasks.memoir_tasks._acquire_chapter_image_lock", return_value=True) def test_generate_chapter_images_converts_non_png_payload_before_upload( self, _acquire_lock_mock, _release_lock_mock, prompt_service_cls, get_image_generator_mock, storage_cls, get_sync_db_mock, ): chapter = _chapter_with_sections([ {"content": "那条路我一直记得。", "image": {"index": 0, "placeholder": "{{{{IMAGE:南方小镇的青石板路}}}}", "description": "南方小镇的青石板路", "status": "pending", "url": None}}, ]) image_buffer = BytesIO() Image.new("RGB", (2, 1), color="white").save(image_buffer, format="JPEG") jpeg_bytes = image_buffer.getvalue() db = Mock() _bind_db_execute_to_chapter(db, chapter) get_sync_db_mock.return_value.__enter__.return_value = db get_sync_db_mock.return_value.__exit__.return_value = False prompt_service_cls.return_value.build_prompt.return_value = { "prompt": "A serene southern China town", "style": "watercolor", "size": "1024x1024", "prompt_context": "childhood: 童年的夏天", } get_image_generator_mock.return_value = _mock_image_generator( image_url="https://provider.example.com/1.jpg", image_bytes=jpeg_bytes, ) storage_inst = storage_cls.from_env.return_value storage_inst.upload_bytes.return_value = "https://cos.example.com/memoirs/u1/c1/0.png" generate_chapter_images.run("chapter-1") upload_args = storage_inst.upload_bytes.call_args.args self.assertTrue(upload_args[0].startswith(b"\x89PNG\r\n\x1a\n")) self.assertEqual(upload_args[2], "image/png") @patch("app.tasks.memoir_tasks.get_sync_db") @patch("app.tasks.memoir_tasks.TencentCosStorageService") @patch("app.tasks.memoir_tasks.get_image_generator") @patch("app.tasks.memoir_tasks.MemoirImagePromptService") @patch("app.tasks.memoir_tasks._release_chapter_image_lock") @patch("app.tasks.memoir_tasks._acquire_chapter_image_lock", return_value=True) def test_generate_chapter_images_fails_without_retry_on_permanent_cos_error( self, _acquire_lock_mock, _release_lock_mock, prompt_service_cls, get_image_generator_mock, storage_cls, get_sync_db_mock, ): chapter = _chapter_with_sections([ {"content": "那条路我一直记得。", "image": {"index": 0, "placeholder": "{{{{IMAGE:南方小镇的青石板路}}}}", "description": "南方小镇的青石板路", "status": "pending", "url": None}}, ]) db = Mock() _bind_db_execute_to_chapter(db, chapter) get_sync_db_mock.return_value.__enter__.return_value = db get_sync_db_mock.return_value.__exit__.return_value = False prompt_service_cls.return_value.build_prompt.return_value = { "prompt": "A serene southern China town", "style": "watercolor", "size": "1024x1024", "prompt_context": "childhood: 童年的夏天", } get_image_generator_mock.return_value = _mock_image_generator() storage_inst = storage_cls.from_env.return_value storage_inst.upload_bytes.side_effect = memoir_tasks.CosUploadError( "AccessDenied", retryable=False, request_id="req-403" ) task_self = SimpleNamespace(request=SimpleNamespace(id="task-1"), retry=Mock()) img_rec = chapter.sections[0].image_record result = generate_chapter_images.run.__func__(task_self, "chapter-1") self.assertEqual(result, {"status": "success"}) self.assertIsNone(chapter.sections[0].image_id) db.delete.assert_called_with(img_rec) task_self.retry.assert_not_called() @patch("app.tasks.memoir_tasks.get_sync_db") @patch("app.tasks.memoir_tasks.TencentCosStorageService") @patch("app.tasks.memoir_tasks.get_image_generator") @patch("app.tasks.memoir_tasks.MemoirImagePromptService") @patch("app.tasks.memoir_tasks._release_chapter_image_lock") @patch("app.tasks.memoir_tasks._acquire_chapter_image_lock", return_value=True) def test_generate_chapter_images_skips_completed_items_for_idempotency( self, _acquire_lock_mock, _release_lock_mock, prompt_service_cls, get_image_generator_mock, storage_cls, get_sync_db_mock, ): chapter = _chapter_with_sections([ {"content": "那条路我一直记得。", "image": {"index": 0, "placeholder": "{{{{IMAGE:南方小镇的青石板路}}}}", "description": "南方小镇的青石板路", "status": "completed", "url": "https://cos.example.com/already-there.png"}}, ]) db = Mock() _bind_db_execute_to_chapter(db, chapter) get_sync_db_mock.return_value.__enter__.return_value = db get_sync_db_mock.return_value.__exit__.return_value = False generate_chapter_images.run("chapter-1") get_image_generator_mock.return_value.generate.assert_not_called() storage_cls.from_env.return_value.upload_bytes.assert_not_called()