fix(mediaserver): sync library data incrementally

app/chain/mediaserver.py

@@ -1,4 +1,5 @@
 import threading
+from datetime import datetime
 from typing import List, Union, Optional, Generator, Any
 
 from app.chain import ChainBase
@@ -134,9 +135,10 @@ class MediaServerChain(ChainBase):
         with lock:
             # 汇总统计
             total_count = 0
-            # 清空登记薄
             dboper = MediaServerOper()
-            dboper.empty()
+            enabled_servers = [mediaserver.name for mediaserver in mediaservers
+                               if mediaserver and mediaserver.enabled and mediaserver.name]
+            dboper.delete_excluded_servers(enabled_servers)
             # 遍历媒体服务器
             for mediaserver in mediaservers:
                 if not mediaserver:
@@ -152,6 +154,7 @@ class MediaServerChain(ChainBase):
                 if not libraries:
                     logger.info(f"没有获取到媒体服务器 {server_name} 的媒体库，跳过")
                     continue
+                sync_time = datetime.now().strftime("%Y-%m-%d %H:%M:%S.%f")
                 for library in libraries:
                     if sync_libraries \
                             and "all" not in sync_libraries \
@@ -180,8 +183,11 @@ class MediaServerChain(ChainBase):
                         item_dict = item.model_dump()
                         item_dict["seasoninfo"] = seasoninfo
                         item_dict["item_type"] = item_type
-                        dboper.add(**item_dict)
+                        item_dict["lst_mod_date"] = sync_time
+                        dboper.upsert(**item_dict)
                     logger.info(f"{server_name} 媒体库 {library.name} 同步完成，共同步数量：{library_count}")
                     # 总数累加
                     total_count += library_count
+                stale_count = dboper.delete_stale(server=server_name, sync_time=sync_time)
+                logger.info(f"媒体服务器 {server_name} 清理陈旧数据完成，删除数量：{stale_count}")
                 logger.info(f"媒体服务器 {server_name} 数据同步完成，总同步数量：{total_count}")

app/db/mediaserver_oper.py

@@ -14,24 +14,67 @@ class MediaServerOper(DbOper):
     def __init__(self, db: Session = None):
         super().__init__(db)
 
+    @staticmethod
+    def __prepare_payload(kwargs: dict) -> dict:
+        """
+        过滤数据库模型不存在或不应由远端覆盖的字段
+        """
+        return {
+            k: v for k, v in kwargs.items()
+            if hasattr(MediaServerItem, k) and k != "id"
+        }
+
     def add(self, **kwargs) -> bool:
         """
         新增媒体服务器数据
         """
-        # MediaServerItem中没有的属性剔除
-        kwargs = {k: v for k, v in kwargs.items() if hasattr(MediaServerItem, k)}
+        kwargs = self.__prepare_payload(kwargs)
+        server = kwargs.get("server")
+        item_id = kwargs.get("item_id")
+        if not server or not item_id:
+            return False
         item = MediaServerItem(**kwargs)
-        if not item.get_by_itemid(self._db, kwargs.get("item_id")):
+        if not item.get_by_server_itemid(self._db, server, item_id):
             item.create(self._db)
             return True
         return False
 
+    def upsert(self, **kwargs) -> bool:
+        """
+        按媒体服务器和条目ID新增或更新数据
+        """
+        kwargs = self.__prepare_payload(kwargs)
+        server = kwargs.get("server")
+        item_id = kwargs.get("item_id")
+        if not server or not item_id:
+            return False
+
+        item = MediaServerItem.get_by_server_itemid(self._db, server, item_id)
+        if item:
+            item.update(self._db, kwargs)
+            return False
+
+        MediaServerItem(**kwargs).create(self._db)
+        return True
+
     def empty(self, server: Optional[str] = None):
         """
         清空媒体服务器数据
         """
         MediaServerItem.empty(self._db, server)
 
+    def delete_stale(self, server: str, sync_time: str) -> int:
+        """
+        删除本轮同步未更新的旧数据
+        """
+        return MediaServerItem.delete_stale(self._db, server, sync_time)
+
+    def delete_excluded_servers(self, servers: list[str]) -> int:
+        """
+        删除未启用或已移除媒体服务器的数据
+        """
+        return MediaServerItem.delete_excluded_servers(self._db, servers)
+
     def exists(self, **kwargs) -> Optional[MediaServerItem]:
         """
         判断媒体服务器数据是否存在

app/db/models/mediaserver.py

@@ -1,7 +1,7 @@
 from datetime import datetime
-from typing import Optional
+from typing import Optional, List
 
-from sqlalchemy import Column, Integer, String, JSON, Index
+from sqlalchemy import Column, Integer, String, JSON, Index, or_
 from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy.orm import Session
@@ -44,6 +44,7 @@ class MediaServerItem(Base):
     lst_mod_date = Column(String, default=datetime.now().strftime("%Y-%m-%d %H:%M:%S"))
 
     __table_args__ = (
+        Index('ux_mediaserveritem_server_item_id', 'server', 'item_id', unique=True),
         Index('ix_mediaserveritem_tmdbid_item_type', 'tmdbid', 'item_type'),
     )
 
@@ -52,13 +53,34 @@ class MediaServerItem(Base):
     def get_by_itemid(cls, db: Session, item_id: str):
         return db.query(cls).filter(cls.item_id == item_id).first()
 
+    @classmethod
+    @db_query
+    def get_by_server_itemid(cls, db: Session, server: str, item_id: str):
+        return db.query(cls).filter(cls.server == server,
+                                    cls.item_id == item_id).first()
+
     @classmethod
     @db_update
     def empty(cls, db: Session, server: Optional[str] = None):
         if server is None:
-            db.query(cls).delete()
+            db.query(cls).delete(synchronize_session=False)
         else:
-            db.query(cls).filter(cls.server == server).delete()
+            db.query(cls).filter(cls.server == server).delete(synchronize_session=False)
+
+    @classmethod
+    @db_update
+    def delete_stale(cls, db: Session, server: str, sync_time: str):
+        return db.query(cls).filter(cls.server == server,
+                                    or_(cls.lst_mod_date.is_(None),
+                                        cls.lst_mod_date != sync_time)).delete(synchronize_session=False)
+
+    @classmethod
+    @db_update
+    def delete_excluded_servers(cls, db: Session, servers: List[str]):
+        if not servers:
+            return db.query(cls).delete(synchronize_session=False)
+        return db.query(cls).filter(or_(cls.server.is_(None),
+                                        ~cls.server.in_(servers))).delete(synchronize_session=False)
 
     @classmethod
     @db_query

database/versions/b8f6e3a1c2d4_2_2_5.py

@@ -0,0 +1,87 @@
+"""2.2.5
+mediaserveritem 改为按 server + item_id 唯一
+
+Revision ID: b8f6e3a1c2d4
+Revises: 93f8cb6a4d1e
+Create Date: 2026-05-09
+"""
+
+from alembic import op
+import sqlalchemy as sa
+
+# revision identifiers, used by Alembic.
+revision = "b8f6e3a1c2d4"
+down_revision = "93f8cb6a4d1e"
+branch_labels = None
+depends_on = None
+
+TABLE_NAME = "mediaserveritem"
+INDEX_NAME = "ux_mediaserveritem_server_item_id"
+INDEX_COLUMNS = ["server", "item_id"]
+
+mediaserveritem = sa.table(
+    TABLE_NAME,
+    sa.column("id", sa.Integer),
+    sa.column("server", sa.String),
+    sa.column("item_id", sa.String),
+)
+
+
+def _table_exists(inspector: sa.Inspector) -> bool:
+    return TABLE_NAME in inspector.get_table_names()
+
+
+def _has_index_signature(inspector: sa.Inspector, unique: bool) -> bool:
+    target_columns = tuple(INDEX_COLUMNS)
+    for index in inspector.get_indexes(TABLE_NAME):
+        if tuple(index.get("column_names") or []) == target_columns and bool(index.get("unique")) == unique:
+            return True
+    return False
+
+
+def _drop_index_if_exists(inspector: sa.Inspector) -> None:
+    for index in inspector.get_indexes(TABLE_NAME):
+        if index.get("name") == INDEX_NAME:
+            op.drop_index(INDEX_NAME, table_name=TABLE_NAME)
+            return
+
+
+def _deduplicate_rows() -> None:
+    bind = op.get_bind()
+    keep_ids = (
+        sa.select(sa.func.max(mediaserveritem.c.id))
+        .where(
+            mediaserveritem.c.server.is_not(None),
+            mediaserveritem.c.item_id.is_not(None),
+        )
+        .group_by(mediaserveritem.c.server, mediaserveritem.c.item_id)
+    )
+    bind.execute(
+        mediaserveritem.delete().where(
+            sa.and_(
+                mediaserveritem.c.server.is_not(None),
+                mediaserveritem.c.item_id.is_not(None),
+                mediaserveritem.c.id.not_in(keep_ids),
+            )
+        )
+    )
+
+
+def upgrade() -> None:
+    inspector = sa.inspect(op.get_bind())
+    if not _table_exists(inspector):
+        return
+
+    _deduplicate_rows()
+
+    inspector = sa.inspect(op.get_bind())
+    if not _has_index_signature(inspector, unique=True):
+        op.create_index(INDEX_NAME, TABLE_NAME, INDEX_COLUMNS, unique=True)
+
+
+def downgrade() -> None:
+    inspector = sa.inspect(op.get_bind())
+    if not _table_exists(inspector):
+        return
+
+    _drop_index_if_exists(inspector)

tests/test_mediaserver_sync_incremental.py

@@ -0,0 +1,243 @@
+import importlib.util
+import sqlite3
+import sys
+import tempfile
+import types
+import unittest
+from pathlib import Path
+from types import SimpleNamespace
+from unittest.mock import patch
+
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+
+if "psutil" not in sys.modules:
+    sys.modules["psutil"] = types.ModuleType("psutil")
+
+if "aiosqlite" not in sys.modules:
+    aiosqlite_module = types.ModuleType("aiosqlite")
+    for attr in (
+        "DatabaseError",
+        "Error",
+        "IntegrityError",
+        "InterfaceError",
+        "InternalError",
+        "NotSupportedError",
+        "OperationalError",
+        "ProgrammingError",
+        "sqlite_version",
+        "sqlite_version_info",
+    ):
+        setattr(aiosqlite_module, attr, getattr(sqlite3, attr))
+    aiosqlite_module.connect = sqlite3.connect
+    aiosqlite_module.paramstyle = "qmark"
+    aiosqlite_module.threadsafety = sqlite3.threadsafety
+    sys.modules["aiosqlite"] = aiosqlite_module
+
+if "app.log" not in sys.modules:
+    log_module = types.ModuleType("app.log")
+
+    class _Logger:
+        def info(self, *_args, **_kwargs):
+            return None
+
+        def debug(self, *_args, **_kwargs):
+            return None
+
+        def warning(self, *_args, **_kwargs):
+            return None
+
+        def error(self, *_args, **_kwargs):
+            return None
+
+    log_module.logger = _Logger()
+    log_module.log_settings = SimpleNamespace()
+    log_module.LogConfigModel = type("LogConfigModel", (), {})
+    sys.modules["app.log"] = log_module
+
+from app import schemas
+from app.db import Base
+from app.db.mediaserver_oper import MediaServerOper
+from app.db.models.mediaserver import MediaServerItem
+
+
+def _load_mediaserver_chain_class():
+    """隔离加载 MediaServerChain，避免测试依赖完整运行时环境。"""
+    module_name = "_test_mediaserver_chain"
+    if module_name in sys.modules:
+        module = sys.modules[module_name]
+        return module, module.MediaServerChain
+
+    if "app.chain" not in sys.modules:
+        chain_module = types.ModuleType("app.chain")
+        chain_module.ChainBase = type("ChainBase", (), {})
+        sys.modules["app.chain"] = chain_module
+
+    if "app.core.config" not in sys.modules:
+        config_module = types.ModuleType("app.core.config")
+        config_module.global_vars = SimpleNamespace(is_system_stopped=False)
+        sys.modules["app.core.config"] = config_module
+
+    if "app.helper.service" not in sys.modules:
+        service_module = types.ModuleType("app.helper.service")
+
+        class _ServiceConfigHelper:
+            @staticmethod
+            def get_mediaserver_configs():
+                return []
+
+        service_module.ServiceConfigHelper = _ServiceConfigHelper
+        sys.modules["app.helper.service"] = service_module
+
+    mediaserver_path = Path(__file__).resolve().parents[1] / "app" / "chain" / "mediaserver.py"
+    spec = importlib.util.spec_from_file_location(module_name, mediaserver_path)
+    module = importlib.util.module_from_spec(spec)
+    sys.modules[module_name] = module
+    assert spec and spec.loader
+    spec.loader.exec_module(module)
+    return module, module.MediaServerChain
+
+
+MEDIA_SERVER_CHAIN_MODULE, MediaServerChain = _load_mediaserver_chain_class()
+
+
+class MediaServerIncrementalSyncTest(unittest.TestCase):
+    """验证媒体库同步改为按条目增量更新。"""
+
+    def setUp(self):
+        self.temp_dir = tempfile.TemporaryDirectory()
+        db_path = Path(self.temp_dir.name) / "mediaserver.db"
+        self.engine = create_engine(f"sqlite:///{db_path}")
+        self.SessionFactory = sessionmaker(bind=self.engine)
+        Base.metadata.create_all(bind=self.engine)
+
+    def tearDown(self):
+        self.engine.dispose()
+        self.temp_dir.cleanup()
+
+    def test_add_allows_same_item_id_across_servers(self):
+        """不同媒体服务器允许复用相同 item_id。"""
+        with self.SessionFactory() as db:
+            oper = MediaServerOper(db)
+
+            self.assertTrue(
+                oper.add(
+                    server="plex",
+                    library="movies",
+                    item_id="same-item-id",
+                    item_type="电影",
+                    title="Movie A",
+                )
+            )
+            self.assertTrue(
+                oper.add(
+                    server="jellyfin",
+                    library="movies",
+                    item_id="same-item-id",
+                    item_type="电影",
+                    title="Movie B",
+                )
+            )
+
+            items = (
+                db.query(MediaServerItem)
+                .order_by(MediaServerItem.server.asc())
+                .all()
+            )
+
+        self.assertEqual(len(items), 2)
+        self.assertEqual([item.server for item in items], ["jellyfin", "plex"])
+
+    def test_sync_updates_rows_and_removes_stale_entries(self):
+        """同步应更新已存在条目，并清理未再出现或已移除服务的数据。"""
+        old_sync_time = "2026-05-01 00:00:00"
+
+        with self.SessionFactory() as db:
+            db.add_all(
+                [
+                    MediaServerItem(
+                        server="plex",
+                        library="movies",
+                        item_id="/library/metadata/1",
+                        item_type="电影",
+                        title="Old Title",
+                        year="2024",
+                        path="/media/old.mkv",
+                        lst_mod_date=old_sync_time,
+                    ),
+                    MediaServerItem(
+                        server="plex",
+                        library="movies",
+                        item_id="/library/metadata/2",
+                        item_type="电影",
+                        title="Stale Title",
+                        year="2020",
+                        path="/media/stale.mkv",
+                        lst_mod_date=old_sync_time,
+                    ),
+                    MediaServerItem(
+                        server="jellyfin",
+                        library="movies",
+                        item_id="/library/metadata/1",
+                        item_type="电影",
+                        title="Removed Server Title",
+                        year="2024",
+                        path="/media/removed.mkv",
+                        lst_mod_date=old_sync_time,
+                    ),
+                ]
+            )
+            db.commit()
+            existing_id = (
+                db.query(MediaServerItem.id)
+                .filter(
+                    MediaServerItem.server == "plex",
+                    MediaServerItem.item_id == "/library/metadata/1",
+                )
+                .scalar()
+            )
+
+        chain = object.__new__(MediaServerChain)
+        chain.librarys = lambda _server: [SimpleNamespace(id="movies", name="电影库")]
+        chain.items = lambda **_kwargs: iter(
+            [
+                schemas.MediaServerItem(
+                    server="plex",
+                    library="movies",
+                    item_id="/library/metadata/1",
+                    item_type="Movie",
+                    title="New Title",
+                    year="2024",
+                    tmdbid=100,
+                    path="/media/new.mkv",
+                )
+            ]
+        )
+        chain.episodes = lambda *_args, **_kwargs: []
+
+        with patch("app.db.ScopedSession", self.SessionFactory), patch.object(
+            MEDIA_SERVER_CHAIN_MODULE.ServiceConfigHelper,
+            "get_mediaserver_configs",
+            return_value=[SimpleNamespace(name="plex", enabled=True, sync_libraries=["all"])],
+        ):
+            chain.sync()
+
+        with self.SessionFactory() as db:
+            items = (
+                db.query(MediaServerItem)
+                .order_by(MediaServerItem.server.asc(), MediaServerItem.item_id.asc())
+                .all()
+            )
+
+        self.assertEqual(len(items), 1)
+        self.assertEqual(items[0].id, existing_id)
+        self.assertEqual(items[0].server, "plex")
+        self.assertEqual(items[0].item_id, "/library/metadata/1")
+        self.assertEqual(items[0].item_type, "电影")
+        self.assertEqual(items[0].title, "New Title")
+        self.assertEqual(items[0].path, "/media/new.mkv")
+        self.assertNotEqual(items[0].lst_mod_date, old_sync_time)
+
+
+if __name__ == "__main__":
+    unittest.main()