modify: 清除diskcache依赖

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 ──────────────────────────────────────────────────