✨ 新增线程安全共享内存储存器

liteyuki/comm/storage.py

@@ -0,0 +1,114 @@
+# -*- coding: utf-8 -*-
+"""
+共享内存模块。类似于redis，但是更加轻量级并且线程安全
+"""
+
+import threading
+from typing import Any, Optional
+
+from liteyuki.utils import IS_MAIN_PROCESS
+from liteyuki.comm.channel import Channel
+
+if IS_MAIN_PROCESS:
+    _locks = {}
+
+
+def _get_lock(key):
+    if IS_MAIN_PROCESS:
+        if key not in _locks:
+            _locks[key] = threading.Lock()
+        return _locks[key]
+    else:
+        raise RuntimeError("Cannot get lock in sub process.")
+
+
+class KeyValueStore:
+    def __init__(self):
+        self._store = {}
+
+        self.active_chan = Channel(_id="shared_memory-active")
+        self.passive_chan = Channel(_id="shared_memory-passive")
+
+    def set(self, key: str, value: any) -> None:
+        if IS_MAIN_PROCESS:
+            lock = _get_lock(key)
+            with lock:
+                self._store[key] = value
+        else:
+            # 向主进程发送请求拿取
+            self.passive_chan.send(("set", key, value))
+
+    def get(self, key: str, default: Optional[any] = None) -> any:
+        if IS_MAIN_PROCESS:
+            lock = _get_lock(key)
+            with lock:
+                return self._store.get(key, default)
+        else:
+            self.passive_chan.send(("get", key, default))
+            return self.active_chan.receive()
+
+    def delete(self, key: str) -> None:
+        if IS_MAIN_PROCESS:
+            lock = _get_lock(key)
+            with lock:
+                if key in self._store:
+                    del self._store[key]
+                    del _locks[key]
+        else:
+            # 向主进程发送请求删除
+            self.passive_chan.send(("delete", key))
+
+    def get_all(self) -> dict[str, any]:
+        if IS_MAIN_PROCESS:
+            return self._store
+        else:
+            self.passive_chan.send(("get_all",))
+            return self.active_chan.receive()
+
+
+class GlobalKeyValueStore:
+    _instance = None
+    _lock = threading.Lock()
+
+    @classmethod
+    def get_instance(cls):
+        if IS_MAIN_PROCESS:
+            if cls._instance is None:
+                with cls._lock:
+                    if cls._instance is None:
+                        cls._instance = KeyValueStore()
+            return cls._instance
+        else:
+            raise RuntimeError("Cannot get instance in sub process.")
+
+
+shared_memory: Optional[KeyValueStore] = None
+
+# 全局单例访问点
+if IS_MAIN_PROCESS:
+    shared_memory = GlobalKeyValueStore.get_instance()
+
+
+    @shared_memory.passive_chan.on_receive(lambda d: d[0] == "get")
+    def on_get(d):
+        print(shared_memory.get_all())
+        shared_memory.active_chan.send(shared_memory.get(d[1], d[2]))
+        print("发送数据：", shared_memory.get(d[1], d[2]))
+
+
+    @shared_memory.passive_chan.on_receive(lambda d: d[0] == "set")
+    def on_set(d):
+        shared_memory.set(d[1], d[2])
+
+
+    @shared_memory.passive_chan.on_receive(lambda d: d[0] == "delete")
+    def on_delete(d):
+        shared_memory.delete(d[1])
+else:
+    shared_memory = None
+
+_ref_count = 0  # 引用计数
+if not IS_MAIN_PROCESS:
+    if (shared_memory is None) and _ref_count > 1:
+        raise RuntimeError("Shared memory not initialized.")
+    _ref_count += 1