From 08657fa166f57b8fde02f7c7932e5051bf5af641 Mon Sep 17 00:00:00 2001
From: chakcy <947105045@qq.com>
Date: Fri, 4 Sep 2026 14:44:06 +0800
Subject: [PATCH] =?UTF-8?q?modify:=20=E6=B8=85=E9=99=A4diskcache=E4=BE=9D?=
 =?UTF-8?q?=E8=B5=96?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 README.md                                |  36 +++--
 pyproject.toml                           |   4 +-
 src/chongming_cache/__init__.py          |   8 +-
 src/chongming_cache/backends/__init__.py |   4 +-
 src/chongming_cache/backends/base.py     |  75 ++++++++++
 src/chongming_cache/backends/disk.py     |  64 --------
 src/chongming_cache/backends/redis_.py   |  41 ++++--
 src/chongming_cache/backends/sqlite_.py  | 178 +++++++++++++++++++++++
 src/chongming_cache/cache.py             |  37 +++--
 tests/test_cache.py                      |  36 ++++-
 uv.lock                                  |  56 ++++++-
 11 files changed, 424 insertions(+), 115 deletions(-)
 delete mode 100644 src/chongming_cache/backends/disk.py
 create mode 100644 src/chongming_cache/backends/sqlite_.py

diff --git a/README.md b/README.md
index fdc9b81..b87ca9b 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # chongming-cache
 
-统一缓存封装，dict-like 接口，后端可切换 **diskcache** / **redis**，通过配置一行切换，业务代码零改动。
+统一缓存封装，dict-like 接口，后端可切换 **sqlite**（本机）/ **redis**（跨主机），通过配置一行切换，业务代码零改动。
 
 ---
 
@@ -24,11 +24,12 @@ from chongming_cache import Cache
 cache = Cache.from_config(config["cache"])
 
 # 方式二：显式参数
-cache = Cache("diskcache", cache_store_path="./cache_data")
+cache = Cache("sqlite", path="./cache_data/cache.db")
 # cache = Cache("redis", redis_host="127.0.0.1", redis_port=6379, redis_prefix="chongming:")
+# 历史后端名 "diskcache" 兼容映射为 sqlite
 ```
 
-### 映射协议（与 diskcache 用法一致）
+### 映射协议（与 dict / diskcache 用法一致）
 
 ```python
 cache["key"] = {"a": 1}        # 写入（无 TTL）
@@ -51,7 +52,7 @@ cache.close()                              # 释放连接
 
 with Cache.from_config(cfg) as cache: ...  # 上下文管理器，退出自动 close
 
-cache.client  # 底层客户端逃生口（diskcache.Cache / redis.Redis）
+cache.client  # 底层客户端逃生口（sqlite3.Connection / redis.Redis）
 
 # 原子写（分布式锁原语）：仅当 key 不存在时写入，成功返回 True，已存在返回 False，不覆盖
 ok = cache.backend.set_nx("leader", {"node": "gw-1"}, expire=30)
@@ -85,7 +86,7 @@ asyncio.run(main())
 - `acquire()`：SET NX，原子地仅在不存在时写入；key 带 TTL 租约，持有方宕机后到期自动让出，不会死锁。
 - `start()` / `stop()`：后台续约任务；续约前校验 token，仅在自己仍持有时 `touch`，锁丢失即停止续约。
 - `release()`：受保护释放——仅当 token 仍匹配（仍是自己持有）才删除，绝不误删其他进程/主机抢到的锁。
-- **后端适用性**：`redis` 真正跨主机共享；`diskcache` 进程安全（SQLite），可用于单机多进程或共享卷场景，不可跨无共享文件系统的主机。
+- **后端适用性**：`redis` 真正跨主机共享；`sqlite` 基于共享文件（SQLite 多进程安全），可用于单机多进程或共享卷场景，不可跨无共享文件系统的主机。
 
 ---
 
@@ -93,8 +94,8 @@ asyncio.run(main())
 
 ```toml
 [cache]
-backend = "diskcache"          # "diskcache"（默认） | "redis"
-cache_store_path = "./cache_data"
+backend = "sqlite"             # "sqlite"（默认，本机共享） | "redis"（跨主机）
+path = "./cache_data/cache.db" # 兼容旧键 cache_store_path（指向目录时自动追加 cache.db）
 
 # redis 后端专用（backend = "redis" 时生效，均有默认值）
 # redis_host = "127.0.0.1"
@@ -104,22 +105,29 @@ cache_store_path = "./cache_data"
 # redis_prefix = "chongming:"
 ```
 
-所有键均可缺省：旧配置（只有 `cache_store_path`）自动按 diskcache 后端工作。
+所有键均可缺省：旧配置（只有 `cache_store_path`）自动按 sqlite 后端工作。
 
 ---
 
 ## 双后端语义对齐
 
-| 行为 | diskcache | redis |
-| ---- | --------- | ----- |
-| 值序列化 | pickle | pickle（保持任意 Python 对象语义一致） |
+| 行为 | sqlite（本机） | redis（跨主机） |
+| ---- | ----------- | ----------- |
+| 值序列化 | JSON(orjson) | JSON(orjson)（与 Rust 进程插件 serde_json 互通） |
 | 未命中 `cache[key]` | `KeyError` | `KeyError` |
 | `set(..., expire=N)` | 秒级 TTL，读时惰性淘汰 | `SET EX N`，到期即消失 |
 | `touch(未命中)` | 返回 False | 返回 False |
 | `clear()` | 清空本地缓存 | 仅清 `redis_prefix` 命名空间（不 flushdb） |
-| 多进程安全 | 是（SQLite + 锁） | 是（服务端原子性） |
+| 多进程安全 | 是（SQLite 文件 + WAL） | 是（服务端原子性） |
+
+## 跨语言共享（Rust 插件 / sqlite）
+
+sqlite 后端把值以 JSON 文本存进表 `cache(k TEXT PRIMARY KEY, v TEXT NOT NULL, expire REAL)`，
+schema 与 Rust 进程插件（`chongming-worker-rs`，feature `local-cache`）完全一致——Python 与
+Rust 读写**同一份 `.db` 文件**即可互通，无需 Redis。Rust 侧读侧不改变该 schema。
 
 ## 依赖
 
-- `diskcache` — 本地持久化后端
-- `redis` — 远程后端（懒加载，diskcache-only 打包产物不引入）
+- `sqlite3` — 本地共享后端（Python 标准库，零第三方依赖）
+- `redis` — 远程后端（懒加载，仅选择 redis 后端时才 import）
+- `orjson` — 全后端统一 JSON 序列化（缺失时回退标准库 `json`）
\ No newline at end of file
diff --git a/pyproject.toml b/pyproject.toml
index b1f10f9..5910aee 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -5,12 +5,12 @@ requires = ["hatchling"]
 [project]
 name = "chongming-cache"
 version = "0.2.0"
-description = "统一缓存封装：兼容 diskcache / redis 后端"
+description = "统一缓存封装：兼容 sqlite(本地) / redis(共享) 后端"
 readme = "README.md"
 requires-python = ">=3.12"
 dependencies = [
-    "diskcache>=5.6.3",
     "redis>=5.0.0",
+    "orjson>=3.9.0",
 ]
 
 [dependency-groups]
diff --git a/src/chongming_cache/__init__.py b/src/chongming_cache/__init__.py
index d6ae466..fc2dee6 100644
--- a/src/chongming_cache/__init__.py
+++ b/src/chongming_cache/__init__.py
@@ -1,14 +1,18 @@
-from chongming_cache.backends import CacheBackend, DiskBackend, RedisBackend
+from chongming_cache.backends import CacheBackend, RedisBackend, SqliteBackend
 from chongming_cache.cache import Cache
 from chongming_cache.lock import DistributedLock
 
+# 兼容旧名：原 diskcache 后端已由 SQLite 后端 (SqliteBackend) 直接替换
+DiskBackend = SqliteBackend
+
 __version__ = "0.2.0"
 
 __all__ = [
     "Cache",
     "CacheBackend",
     "DiskBackend",
+    "SqliteBackend",
     "RedisBackend",
     "DistributedLock",
     "__version__",
-]
+]
\ No newline at end of file
diff --git a/src/chongming_cache/backends/__init__.py b/src/chongming_cache/backends/__init__.py
index ad07a2a..7060086 100644
--- a/src/chongming_cache/backends/__init__.py
+++ b/src/chongming_cache/backends/__init__.py
@@ -1,5 +1,5 @@
 from chongming_cache.backends.base import CacheBackend
-from chongming_cache.backends.disk import DiskBackend
 from chongming_cache.backends.redis_ import RedisBackend
+from chongming_cache.backends.sqlite_ import SqliteBackend
 
-__all__ = ["CacheBackend", "DiskBackend", "RedisBackend"]
+__all__ = ["CacheBackend", "SqliteBackend", "RedisBackend"]
\ No newline at end of file
diff --git a/src/chongming_cache/backends/base.py b/src/chongming_cache/backends/base.py
index ca467a5..eec6cea 100644
--- a/src/chongming_cache/backends/base.py
+++ b/src/chongming_cache/backends/base.py
@@ -1,8 +1,83 @@
 """缓存后端抽象接口：dict-like 映射 + TTL。"""
 
+import base64
+import pickle
 from abc import ABC, abstractmethod
 from typing import Any, Iterator
 
+try:
+    import orjson
+
+    def _dumps(value: Any) -> bytes:
+        # default：bytes 无法原生 JSON 化，包成 {__b64__: base64}，读取时还原为 bytes
+        def _default(obj: Any) -> Any:
+            if isinstance(obj, bytes):
+                return {_B64_MARKER: base64.b64encode(obj).decode("ascii")}
+            raise TypeError(f"无法序列化为 JSON: {type(obj)!r}")
+
+        return orjson.dumps(value, default=_default)
+
+    def _loads(raw) -> Any:
+        return orjson.loads(raw)
+
+except ImportError:  # pragma: no cover
+    import json
+
+    def _dumps(value: Any) -> bytes:
+        def _default(obj: Any) -> Any:
+            if isinstance(obj, bytes):
+                return {_B64_MARKER: base64.b64encode(obj).decode("ascii")}
+            raise TypeError(f"无法序列化为 JSON: {type(obj)!r}")
+
+        return json.dumps(value, ensure_ascii=False, default=_default).encode("utf-8")
+
+    def _loads(raw) -> Any:
+        return json.loads(raw.decode("utf-8"))
+
+# bytes 的 base64 包裹标记：让 bytes（如 RPC 缓存回复）在 JSON 下也能无损往返。
+_B64_MARKER = "__b64__"
+
+# 所有后端统一以 JSON 持久化：跨后端（redis/本地 diskcache）语义一致，
+# 且与 Rust 进程插件（serde_json / json）的共享协议互通。
+
+
+def _restore_bytes(obj: Any) -> Any:
+    """递归还原被包裹的 bytes。"""
+    if isinstance(obj, dict):
+        if len(obj) == 1 and _B64_MARKER in obj:
+            try:
+                return base64.b64decode(obj[_B64_MARKER])
+            except Exception:
+                pass
+        return {k: _restore_bytes(v) for k, v in obj.items()}
+    if isinstance(obj, list):
+        return [_restore_bytes(v) for v in obj]
+    return obj
+
+
+def encode_value(value: Any) -> bytes:
+    """统一序列化：JSON（orjson）。bytes 以 base64 包裹；datetime/set/自定义对象不支持。"""
+    return _dumps(value)
+
+
+def decode_value(raw: Any) -> Any:
+    """统一反序列化。
+
+    - 字节值优先按 JSON 解析（orjson）；bytes 从 base64 包裹还原；
+    - 解析失败回退 pickle（兼容历史 pickled 数据，跨后端切换窗口）；
+    - 若后端已把对象透明还原（旧磁盘直存路径），非字节则原样返回。
+    """
+    if not isinstance(raw, (bytes, bytearray)):
+        return raw
+    try:
+        return _restore_bytes(_loads(raw))
+    except Exception:
+        pass
+    try:
+        return pickle.loads(raw)
+    except Exception:
+        return raw
+
 
 class CacheBackend(ABC):
     """缓存后端统一接口。
diff --git a/src/chongming_cache/backends/disk.py b/src/chongming_cache/backends/disk.py
deleted file mode 100644
index ec43fd1..0000000
--- a/src/chongming_cache/backends/disk.py
+++ /dev/null
@@ -1,64 +0,0 @@
-"""diskcache 后端：基于 SQLite 的本地持久化缓存，多进程安全。"""
-
-from pathlib import Path
-from typing import Any, Iterator
-
-from diskcache import Cache as DiskCache
-
-from chongming_cache.backends.base import CacheBackend
-
-
-class DiskBackend(CacheBackend):
-    """包装 diskcache.Cache，提供统一接口。
-
-    Args:
-        path: 缓存目录（SQLite 数据文件所在目录），父目录不存在时自动创建。
-    """
-
-    def __init__(self, path: str | Path):
-        self._cache = DiskCache(path)
-
-    @property
-    def client(self) -> DiskCache:
-        """底层 diskcache.Cache 实例（逃生口）。"""
-        return self._cache
-
-    def __contains__(self, key) -> bool:
-        return key in self._cache
-
-    def __getitem__(self, key) -> Any:
-        return self._cache[key]
-
-    def __setitem__(self, key, value) -> None:
-        self._cache[key] = value
-
-    def __delitem__(self, key) -> None:
-        del self._cache[key]
-
-    def __len__(self) -> int:
-        return len(self._cache)
-
-    def __iter__(self) -> Iterator:
-        return iter(self._cache)
-
-    def get(self, key, default=None) -> Any:
-        return self._cache.get(key, default)
-
-    def set(self, key, value, expire: float | None = None) -> None:
-        self._cache.set(key, value, expire=expire)
-
-    def set_nx(self, key, value, expire: float | None = None) -> bool:
-        # diskcache.add 仅在 key 不存在时写入，返回是否成功（SET NX 语义）且进程安全
-        return bool(self._cache.add(key, value, expire=expire))
-
-    def touch(self, key, expire: float | None = None) -> bool:
-        return self._cache.touch(key, expire=expire)
-
-    def delete(self, key) -> bool:
-        return self._cache.delete(key)
-
-    def clear(self) -> None:
-        self._cache.clear()
-
-    def close(self) -> None:
-        self._cache.close()
diff --git a/src/chongming_cache/backends/redis_.py b/src/chongming_cache/backends/redis_.py
index 0167b2e..7e5a58f 100644
--- a/src/chongming_cache/backends/redis_.py
+++ b/src/chongming_cache/backends/redis_.py
@@ -2,12 +2,16 @@
 
 redis-py 采用懒加载：仅在选择 redis 后端时才 import，
 使用 diskcache 后端的打包产物不会引入 redis 依赖。
+
+值统一使用 JSON（orjson）序列化，与本地 diskcache 后端及 Rust 进程插件
+（serde_json）共享同一套跨语言协议；``prefix`` 作为 key 命名空间前缀。
 """
 
-import pickle
+import datetime
 from typing import Any, Iterator
 
-from chongming_cache.backends.base import CacheBackend
+from chongming_cache.backends.base import CacheBackend, decode_value, encode_value
+
 
 # SCAN 批大小与 clear() 管道批大小
 _SCAN_COUNT = 1000
@@ -16,8 +20,8 @@ _SCAN_COUNT = 1000
 class RedisBackend(CacheBackend):
     """包装 redis-py 客户端，提供统一接口。
 
-    值使用 pickle 序列化（与 diskcache 默认序列化语义对齐，支持任意 Python 对象）；
-    ``prefix`` 作为 key 命名空间前缀，便于多实例共享同一 Redis 时互不干扰。
+    值统一使用 JSON（orjson）序列化；``prefix`` 作为 key 命名空间前缀，
+    便于多实例共享同一 Redis 时互不干扰。
 
     Args:
         host: Redis 地址
@@ -66,6 +70,19 @@ class RedisBackend(CacheBackend):
         """去掉前缀并解码为 str。"""
         return raw[len(self._prefix) :].decode()
 
+    @staticmethod
+    def _expire_secs(expire):
+        """把秒（可能是 float）规范为 redis-py 可接受的取值。
+
+        redis-py 的 ``SET EX`` / ``EXPIRE`` 只接受 ``int`` 或 ``datetime.timedelta``，
+        传入 float（如 DistributedLock 默认 ttl=30.0）会抛 ``DataError``。
+        """
+        if isinstance(expire, datetime.timedelta):
+            return expire
+        if expire is not None:
+            return int(expire)
+        return None
+
     def __contains__(self, key) -> bool:
         return bool(self._redis.exists(self._key(key)))
 
@@ -73,10 +90,10 @@ class RedisBackend(CacheBackend):
         raw = self._redis.get(self._key(key))
         if raw is None:
             raise KeyError(key)
-        return pickle.loads(raw)
+        return decode_value(raw)
 
     def __setitem__(self, key, value) -> None:
-        self._redis.set(self._key(key), pickle.dumps(value))
+        self._redis.set(self._key(key), encode_value(value))
 
     def __delitem__(self, key) -> None:
         if not self._redis.delete(self._key(key)):
@@ -95,25 +112,27 @@ class RedisBackend(CacheBackend):
         raw = self._redis.get(self._key(key))
         if raw is None:
             return default
-        return pickle.loads(raw)
+        return decode_value(raw)
 
     def set(self, key, value, expire: float | None = None) -> None:
-        self._redis.set(self._key(key), pickle.dumps(value), ex=expire)
+        self._redis.set(
+            self._key(key), encode_value(value), ex=self._expire_secs(expire)
+        )
 
     def set_nx(self, key, value, expire: float | None = None) -> bool:
         # redis SET key val NX EX ttl：原子地仅在不存在时写入，用于分布式锁
         return bool(
             self._redis.set(
                 self._key(key),
-                pickle.dumps(value),
-                ex=expire,
+                encode_value(value),
+                ex=self._expire_secs(expire),
                 nx=True,
             )
         )
 
     def touch(self, key, expire: float | None = None) -> bool:
         # expire=None 时 redis-py 发 PERSIST（永久），与 diskcache.touch 语义一致
-        return bool(self._redis.expire(self._key(key), expire))
+        return bool(self._redis.expire(self._key(key), self._expire_secs(expire)))
 
     def delete(self, key) -> bool:
         return bool(self._redis.delete(self._key(key)))
diff --git a/src/chongming_cache/backends/sqlite_.py b/src/chongming_cache/backends/sqlite_.py
new file mode 100644
index 0000000..ce9cab4
--- /dev/null
+++ b/src/chongming_cache/backends/sqlite_.py
@@ -0,0 +1,178 @@
+"""sqlite 后端：基于标准库 SQLite 的本地共享键值缓存（替代原 diskcache 后端）。
+
+值以 JSON(orjson) 存入 TEXT 列，序列化协议与 redis 后端 / Rust 进程插件（serde_json）
+共享同一套 schema，因此 Rust 侧（sqlx）可直接读写同一份 .db 文件，实现真正的跨语言
+本地共享（无需 Redis）。
+
+- 本地、多进程安全：WAL + busy_timeout + SQLite 行锁（等价于原 diskcache 的多进程语义）；
+- TTL：``expire`` 列存到期 epoch 秒，读时惰性淘汰（对齐 diskcache/redis 的 get 语义）。
+
+共享 schema（Ruby/Python 与 Rust 必须一致）：
+
+    CREATE TABLE IF NOT EXISTS cache (
+        k      TEXT PRIMARY KEY,
+        v      TEXT NOT NULL,   -- JSON 文本
+        expire REAL             -- 到期 epoch 秒；NULL 表示永不过期
+    );
+"""
+
+import sqlite3
+import threading
+import time
+from pathlib import Path
+from typing import Any, Iterator
+
+from chongming_cache.backends.base import CacheBackend, decode_value, encode_value
+
+_SCHEMA = """
+CREATE TABLE IF NOT EXISTS cache (
+    k      TEXT PRIMARY KEY,
+    v      TEXT NOT NULL,
+    expire REAL
+);
+"""
+
+
+class SqliteBackend(CacheBackend):
+    """包装 sqlite3，提供统一接口（与 Rust 侧共享同一份 schema）。
+
+    Args:
+        path: SQLite 数据库文件路径（父目录不存在时自动创建）。
+    """
+
+    def __init__(self, path: str | Path):
+        p = Path(path)
+        if p.parent and str(p.parent) != ".":
+            p.parent.mkdir(parents=True, exist_ok=True)
+        self._path = str(p)
+        self._lock = threading.RLock()
+        self._conn = sqlite3.connect(self._path, check_same_thread=False)
+        self._conn.execute("PRAGMA journal_mode=WAL")
+        self._conn.execute("PRAGMA busy_timeout=5000")
+        self._conn.execute(_SCHEMA)
+        self._conn.commit()
+
+    @property
+    def client(self) -> sqlite3.Connection:
+        """底层 sqlite3.Connection 实例（逃生口）。"""
+        return self._conn
+
+    @staticmethod
+    def _expire_secs(expire) -> float | None:
+        """秒级 TTL -> 到期 epoch 时间戳；None 表示永不过期。"""
+        if expire is None:
+            return None
+        return time.time() + float(expire)
+
+    def _live_value(self, k: str) -> str | None:
+        """取未过期的原始 JSON 文本；过期或缺失返回 None（过期时顺手删除）。"""
+        row = self._conn.execute(
+            "SELECT v, expire FROM cache WHERE k = ?", (k,)
+        ).fetchone()
+        if row is None:
+            return None
+        v, expire = row
+        if expire is not None and expire <= time.time():
+            self._conn.execute("DELETE FROM cache WHERE k = ?", (k,))
+            self._conn.commit()
+            return None
+        return v
+
+    def __contains__(self, key) -> bool:
+        with self._lock:
+            return self._live_value(str(key)) is not None
+
+    def __getitem__(self, key) -> Any:
+        with self._lock:
+            raw = self._live_value(str(key))
+        if raw is None:
+            raise KeyError(key)
+        return decode_value(raw.encode("utf-8"))
+
+    def __setitem__(self, key, value) -> None:
+        with self._lock:
+            self._set(str(key), value, None)
+
+    def __delitem__(self, key) -> None:
+        with self._lock:
+            if not self.delete(key):
+                raise KeyError(key)
+
+    def __len__(self) -> int:
+        with self._lock:
+            now = time.time()
+            self._conn.execute(
+                "DELETE FROM cache WHERE expire IS NOT NULL AND expire <= ?", (now,)
+            )
+            self._conn.commit()
+            return self._conn.execute("SELECT COUNT(*) FROM cache").fetchone()[0]
+
+    def __iter__(self) -> Iterator:
+        with self._lock:
+            now = time.time()
+            self._conn.execute(
+                "DELETE FROM cache WHERE expire IS NOT NULL AND expire <= ?", (now,)
+            )
+            self._conn.commit()
+            rows = self._conn.execute("SELECT k FROM cache").fetchall()
+        return iter(row[0] for row in rows)
+
+    def get(self, key, default=None) -> Any:
+        with self._lock:
+            raw = self._live_value(str(key))
+        if raw is None:
+            return default
+        return decode_value(raw.encode("utf-8"))
+
+    def _set(self, k: str, value: Any, expire) -> None:
+        v = encode_value(value).decode("utf-8")
+        self._conn.execute(
+            "INSERT INTO cache(k, v, expire) VALUES(?, ?, ?) "
+            "ON CONFLICT(k) DO UPDATE SET v=excluded.v, expire=excluded.expire",
+            (k, v, expire),
+        )
+        self._conn.commit()
+
+    def set(self, key, value, expire: float | None = None) -> None:
+        with self._lock:
+            self._set(str(key), value, self._expire_secs(expire))
+
+    def set_nx(self, key, value, expire: float | None = None) -> bool:
+        with self._lock:
+            k = str(key)
+            v = encode_value(value).decode("utf-8")
+            cur = self._conn.execute(
+                "INSERT OR IGNORE INTO cache(k, v, expire) VALUES(?, ?, ?)",
+                (k, v, self._expire_secs(expire)),
+            )
+            self._conn.commit()
+            return cur.rowcount == 1
+
+    def touch(self, key, expire: float | None = None) -> bool:
+        with self._lock:
+            k = str(key)
+            if self._live_value(k) is None:
+                return False
+            self._conn.execute(
+                "UPDATE cache SET expire=? WHERE k=?", (self._expire_secs(expire), k)
+            )
+            self._conn.commit()
+            return True
+
+    def delete(self, key) -> bool:
+        with self._lock:
+            cur = self._conn.execute("DELETE FROM cache WHERE k = ?", (str(key),))
+            self._conn.commit()
+            return cur.rowcount > 0
+
+    def clear(self) -> None:
+        with self._lock:
+            self._conn.execute("DELETE FROM cache")
+            self._conn.commit()
+
+    def close(self) -> None:
+        with self._lock:
+            try:
+                self._conn.close()
+            except Exception:
+                pass
\ No newline at end of file
diff --git a/src/chongming_cache/cache.py b/src/chongming_cache/cache.py
index 729a24c..08dac51 100644
--- a/src/chongming_cache/cache.py
+++ b/src/chongming_cache/cache.py
@@ -1,10 +1,14 @@
-"""统一缓存门面：dict-like 接口，后端可切换 diskcache / redis。"""
+"""统一缓存门面：dict-like 接口，后端可切换 sqlite(本地) / redis(共享)。"""
 
+from pathlib import Path
 from typing import Any, Iterator, Mapping
 
-from chongming_cache.backends import CacheBackend, DiskBackend, RedisBackend
+from chongming_cache.backends import CacheBackend, RedisBackend, SqliteBackend
 
-_KNOWN_BACKENDS = {"diskcache", "redis"}
+_KNOWN_BACKENDS = {"sqlite", "redis"}
+# 旧后端名 diskcache → sqlite（新本地后端直接替换了原 diskcache 实现）
+_BACKEND_ALIASES = {"diskcache": "sqlite"}
+_DEFAULT_PATH = "./cache_data/cache.db"
 
 
 class Cache:
@@ -24,11 +28,11 @@ class Cache:
             value = cache["k"]
     """
 
-    def __init__(self, backend: str = "diskcache", **params):
+    def __init__(self, backend: str = "sqlite", **params):
         """创建缓存实例。
 
         Args:
-            backend: "diskcache" 或 "redis"
+            backend: "sqlite" 或 "redis"（旧名 "diskcache" 兼容映射到 sqlite）
             **params: 后端参数，见 ``from_config`` 说明
         """
         self._backend = self._create_backend(backend, params)
@@ -37,24 +41,29 @@ class Cache:
     def from_config(cls, config: Mapping) -> "Cache":
         """从配置字典创建缓存实例，读取形如主项目 config.toml 的 ``[cache]`` 段：
 
-        - ``backend``: "diskcache"（默认）或 "redis"
-        - ``cache_store_path``: diskcache 缓存目录（默认 "./cache_data"）
+        - ``backend``: "sqlite"（默认，本地共享）或 "redis"（跨主机）
+        - ``path`` / ``cache_store_path``: sqlite 数据库文件路径（默认 "./cache_data/cache.db"）
         - ``redis_host`` / ``redis_port`` / ``redis_db`` / ``redis_password`` / ``redis_prefix``:
           redis 后端连接参数（仅 backend = "redis" 时生效）
 
         所有键均可缺省，旧配置（只有 cache_store_path）直接兼容。
         """
         cfg = dict(config)
-        return cls(cfg.pop("backend", "diskcache"), **cfg)
+        return cls(cfg.pop("backend", "sqlite"), **cfg)
 
     @staticmethod
     def _create_backend(backend: str, params: Mapping) -> CacheBackend:
-        name = (backend or "diskcache").strip().lower()
+        name = _BACKEND_ALIASES.get((backend or "sqlite").strip().lower(), (backend or "sqlite").strip().lower())
         if name not in _KNOWN_BACKENDS:
-            raise ValueError(f"不支持的缓存后端: {backend!r}（可选 diskcache / redis）")
+            raise ValueError(f"不支持的缓存后端: {backend!r}（可选 sqlite / redis）")
 
-        if name == "diskcache":
-            return DiskBackend(params.get("cache_store_path", "./cache_data"))
+        if name == "sqlite":
+            path = params.get("path") or params.get("cache_store_path") or _DEFAULT_PATH
+            p = Path(path)
+            # 兼容旧 diskcache 配置：路径若指向目录则追加默认 db 文件名
+            if path.endswith(("/", "\\")) or p.is_dir():
+                p = p / "cache.db"
+            return SqliteBackend(p)
 
         return RedisBackend(
             host=params.get("redis_host", "127.0.0.1"),
@@ -66,12 +75,12 @@ class Cache:
 
     @property
     def backend(self) -> CacheBackend:
-        """后端封装实例（DiskBackend / RedisBackend）。"""
+        """后端封装实例（SqliteBackend / RedisBackend）。"""
         return self._backend
 
     @property
     def client(self):
-        """底层客户端（diskcache.Cache / redis.Redis），逃生口。"""
+        """底层客户端（sqlite3.Connection / redis.Redis），逃生口。"""
         return self._backend.client
 
     # ── 映射协议 ──────────────────────────────────────────────
diff --git a/tests/test_cache.py b/tests/test_cache.py
index 90ff3a8..425e0af 100644
--- a/tests/test_cache.py
+++ b/tests/test_cache.py
@@ -5,6 +5,7 @@ redis 后端优先连接真实服务（REDIS_HOST/REDIS_PORT），不可用时
 """
 
 import os
+import sqlite3
 import threading
 import time
 
@@ -57,7 +58,7 @@ def _shutdown_fake_redis():
 @pytest.fixture
 def disk_cache(tmp_path):
     cache = Cache.from_config(
-        {"backend": "diskcache", "cache_store_path": str(tmp_path / "cache")}
+        {"backend": "sqlite", "path": str(tmp_path / "cache.db")}
     )
     yield cache
     cache.close()
@@ -116,7 +117,7 @@ def test_expire_disk(disk_cache):
     disk_cache.set("e", 1, expire=1)
     assert "e" in disk_cache
     time.sleep(1.2)
-    assert "e" not in disk_cache  # diskcache 读时惰性淘汰
+    assert "e" not in disk_cache  # sqlite 读时惰性淘汰
     assert disk_cache.get("e", "miss") == "miss"
 
 
@@ -130,14 +131,14 @@ def test_touch_disk(disk_cache):
 
 def test_context_manager(tmp_path):
     with Cache.from_config(
-        {"backend": "diskcache", "cache_store_path": str(tmp_path / "cm")}
+        {"backend": "sqlite", "path": str(tmp_path / "cm.db")}
     ) as cache:
         cache["x"] = 1
         assert cache["x"] == 1
 
 
 def test_from_config_defaults(tmp_path, monkeypatch):
-    # 缺省 backend 时默认 diskcache；缺省 cache_store_path 时用 ./cache_data
+    # 缺省 backend 时默认 sqlite；缺省 path 时用 ./cache_data/cache.db
     monkeypatch.chdir(tmp_path)
     cache = Cache.from_config({})
     try:
@@ -149,7 +150,32 @@ def test_from_config_defaults(tmp_path, monkeypatch):
 
 def test_invalid_backend(tmp_path):
     with pytest.raises(ValueError):
-        Cache.from_config({"backend": "memcached", "cache_store_path": str(tmp_path)})
+        Cache.from_config({"backend": "memcached", "path": str(tmp_path)})
+
+
+def test_sqlite_json_interop_and_multi_instance(tmp_path):
+    """SQLite 落盘是纯 JSON 文本（Rust 可读），且两个后端实例共享同一文件。"""
+    db = str(tmp_path / "shared.db")
+    a = Cache.from_config({"backend": "sqlite", "path": db})
+    b = Cache.from_config({"backend": "sqlite", "path": db})
+    try:
+        # 待共享值：纯 JSON 类型，应原样以 JSON 文本落盘
+        a.set("app:latest", {"msg": "hello", "n": 42})
+        # 共享文件可跨实例读取（多进程安全语义）
+        assert b.get("app:latest") == {"msg": "hello", "n": 42}
+        # 直接查库：v 列为 JSON 文本而非 pickle 字节
+        row = sqlite3.connect(db).execute(
+            "SELECT v FROM cache WHERE k='app:latest'"
+        ).fetchone()
+        assert row is not None
+        assert row[0] == '{"msg":"hello","n":42}'
+        # TTL 过期后跨实例同样读不到
+        a.set("exp", 1, expire=1)
+        time.sleep(1.1)
+        assert b.get("exp") is None
+    finally:
+        a.close()
+        b.close()
 
 
 # ── redis 后端 ──────────────────────────────────────────────────
diff --git a/uv.lock b/uv.lock
index 5ed5cb9..ea1846a 100644
--- a/uv.lock
+++ b/uv.lock
@@ -187,10 +187,11 @@ wheels = [
 
 [[package]]
 name = "chongming-cache"
-version = "0.1.0"
+version = "0.2.0"
 source = { editable = "." }
 dependencies = [
     { name = "diskcache" },
+    { name = "orjson" },
     { name = "redis" },
 ]
 
@@ -204,6 +205,7 @@ dev = [
 [package.metadata]
 requires-dist = [
     { name = "diskcache", specifier = ">=5.6.3" },
+    { name = "orjson", specifier = ">=3.9.0" },
     { name = "redis", specifier = ">=5.0.0" },
 ]
 
@@ -445,6 +447,58 @@ wheels = [
     { url = "https://mirrors.tuna.tsinghua.edu.cn/pypi/web/packages/f9/70/e140dffff6e808dc6343598df76e7e2407fd0f581de3524c75fba2e0cf24/nh3-0.3.7-cp38-abi3-win_arm64.whl", hash = "sha256:f04b7d333b27f13ca439da3cf1c75c2fba34f104969f6ce4ac8e7079699c2f4a", size = 621867, upload-time = "2026-08-23T14:26:29.547Z" },
 ]
 
+[[package]]
+name = "orjson"
+version = "3.12.0"
+source = { registry = "https://mirrors.tuna.tsinghua.edu.cn/pypi/web/simple" }
+sdist = { url = "https://mirrors.tuna.tsinghua.edu.cn/pypi/web/packages/0f/f3/742fb1f62b825f2c010697eaf4e828004bc2a81e7e806666989c132c7c42/orjson-3.12.0.tar.gz", hash = "sha256:d14203fb1aae2ad9b3d52f8a0e82aeb10197ef1c9bc61da7f358bd70b00123d5", size = 4142915, upload-time = "2026-08-14T16:13:30.607Z" }
+wheels = [
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+    { url = "https://mirrors.tuna.tsinghua.edu.cn/pypi/web/packages/29/98/758cf90fbeaaafb7f8141bfac75a432099959f3a2f5db93a412e876415d8/orjson-3.12.0-cp312-cp312-macosx_15_0_arm64.whl", hash = "sha256:11edb4660a6680abee9788a3a9072208a2c96538cc1322bd79542065229d8e54", size = 123725, upload-time = "2026-08-14T16:12:30.013Z" },
+    { url = "https://mirrors.tuna.tsinghua.edu.cn/pypi/web/packages/32/b5/5b934d251f8651f7e41df180ad0c57a6e1cabe15c7bd331638413a50ebc9/orjson-3.12.0-cp312-cp312-manylinux2014_armv7l.manylinux_2_17_armv7l.whl", hash = "sha256:2d3a9da945a4d96ae758fdaaca56742e6b73b6fd554c5d8876f252a6dad70b83", size = 113375, upload-time = "2026-08-14T16:12:31.209Z" },
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