TS 实现简易 LRU 缓存：新增缓存类 + 核心方法 + 容量满自动淘汰 LRU 项

2026-05-22 12:30:59 +08:00 · 2026-01-28 02:27:30 +08:00
parent ee9589bba0
commit eea7ee569c
18 changed files with 1132 additions and 338 deletions
@@ -0,0 +1,88 @@
+const { parentPort, workerData } = require('worker_threads')
+const path = require('path')
+const fs = require('fs')
+const koffi = require('koffi')
+
+// 从 workerData 获取 DLL 路径
+const { dllPath } = workerData
+
+if (!dllPath || !fs.existsSync(dllPath)) {
+    parentPort?.postMessage({ type: 'error', error: 'DLL path not found: ' + dllPath })
+    process.exit(1)
+}
+
+try {
+    // 加载 DLL
+    const lib = koffi.load(dllPath)
+
+    // 定义回调类型
+    const ProgressCallback = koffi.proto('void ProgressCallback(int current, int total)')
+
+    // 绑定函数 (这里使用同步版本，因为 Worker 本身就是独立的线程)
+    const Wcdb_DecryptDatabaseWithProgress = lib.func('int Wcdb_DecryptDatabaseWithProgress(const char* inputPath, const char* outputPath, const char* hexKey, ProgressCallback* callback)')
+    const Wcdb_GetLastErrorMsg = lib.func('int Wcdb_GetLastErrorMsg(char* buffer, int size)')
+
+    // 监听主线程消息
+    parentPort?.on('message', (message) => {
+        if (message.type === 'decrypt') {
+            const { id, inputPath, outputPath, hexKey } = message
+
+            try {
+                // 确保输出目录存在
+                const outputDir = path.dirname(outputPath)
+                if (!fs.existsSync(outputDir)) {
+                    fs.mkdirSync(outputDir, { recursive: true })
+                }
+
+                // 定义进度回调 (带节流，每 100ms 更新一次)
+                let lastUpdate = 0
+
+                const onProgress = koffi.register((current, total) => {
+                    const now = Date.now()
+                    if (now - lastUpdate > 100 || current === total || current === 1) {
+                        lastUpdate = now
+                        parentPort?.postMessage({
+                            type: 'progress',
+                            id,
+                            current,
+                            total
+                        })
+                    }
+                }, koffi.pointer(ProgressCallback))
+
+                // 执行解密
+                const result = Wcdb_DecryptDatabaseWithProgress(inputPath, outputPath, hexKey, onProgress)
+
+                // 注销回调以释放资源
+                koffi.unregister(onProgress)
+
+                if (result === 0) {
+                    parentPort?.postMessage({ type: 'success', id })
+                } else {
+                    // 获取错误信息
+                    const buffer = Buffer.alloc(512)
+                    Wcdb_GetLastErrorMsg(buffer, 512)
+                    const errorMsg = buffer.toString('utf8').replace(/\0+$/, '')
+
+                    parentPort?.postMessage({
+                        type: 'error',
+                        id,
+                        error: errorMsg || `ErrorCode: ${result}`
+                    })
+                }
+            } catch (err) {
+                parentPort?.postMessage({
+                    type: 'error',
+                    id,
+                    error: String(err)
+                })
+            }
+        }
+    })
+
+    // 通知主线程 Worker 已就绪
+    parentPort?.postMessage({ type: 'ready' })
+
+} catch (err) {
+    parentPort?.postMessage({ type: 'error', error: String(err) })
+}