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c18dc44e72
- 新增通用 LruCache 类，支持按条目数/字节容量两种淘汰策略 - 字体裁剪结果 LRU 内存缓存（默认 10MB，X-Cache 响应头标识命中） - 新增 GET /api/stats 运行时统计接口 - 前端统计面板（10s 轮询，页面不可见时暂停） - API handler 拆分到 routes/ 目录，提取 shared.ts 共享模块 Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
87 lines
2.6 KiB
TypeScript
87 lines
2.6 KiB
TypeScript
import { fontDirs, subsetCacheMaxSize } from "./config";
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import { LruCache } from "./lru_cache";
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import { path_join, readFile, stat, readdir } from "./interface";
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/** 解析请求 URL（req.url 只有路径，需要补全协议和主机才能用 URL API） */
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export function parseUrl(req: Request): URL {
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return new URL(req.url, "http://localhost");
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}
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/** JSON 响应工具 */
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export function jsonResponse(data: unknown, status = 200) {
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return new Response(JSON.stringify(data), {
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status,
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headers: { "Content-Type": "application/json" },
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});
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}
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/** 运行时统计 */
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export const stats = {
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/** 服务启动时间戳 */
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startTime: Date.now(),
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/** 总请求数 */
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totalRequests: 0,
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/** 字体裁剪请求次数（含缓存命中） */
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subsetRequests: 0,
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/** 字体裁剪缓存命中次数 */
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subsetCacheHits: 0,
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/** 累计裁剪文字字符数 */
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totalChars: 0,
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};
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/** 字体文件 LRU 缓存，最多保留 3 个最近使用的字体 buffer（按条目数淘汰） */
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export const fontBufferCache = new LruCache<ArrayBuffer>({ maxSize: 3 });
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/** 字体裁剪结果 LRU 缓存（按字节容量淘汰） */
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export const subsetCache = new LruCache<ArrayBuffer>({ maxBytes: subsetCacheMaxSize, sizeFn: (v) => v.byteLength });
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/**
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* 在所有字体目录中查找字体文件
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* 匹配优先级：精确匹配 > 前缀匹配 > 包含匹配
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*/
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export async function findFontPath(filename: string): Promise<string | null> {
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for (const dir of fontDirs) {
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const filePath = path_join(dir, filename);
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try {
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const s = await stat(filePath);
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if (s.isFile()) return filePath;
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} catch {}
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}
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const allFonts: Array<{ basename: string; path: string }> = [];
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for (const dir of fontDirs) {
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try {
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const entries = await readdir(dir);
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for (const entry of entries) {
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if (entry.isFile() && /\.(ttf|otf|woff|woff2)$/i.test(entry.name)) {
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allFonts.push({
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basename: entry.name.replace(/\.[^.]+$/, ""),
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path: path_join(dir, entry.name),
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});
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}
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}
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} catch {}
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}
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const query = filename.replace(/\.[^.]+$/, "").toLowerCase();
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for (const f of allFonts) {
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if (f.basename.toLowerCase().startsWith(query)) return f.path;
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}
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for (const f of allFonts) {
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if (f.basename.toLowerCase().includes(query)) return f.path;
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}
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return null;
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}
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/** 从缓存或磁盘读取字体 buffer */
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export async function readFontBuffer(fontPath: string): Promise<ArrayBuffer> {
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const cached = fontBufferCache.get(fontPath);
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if (cached) return cached;
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const buffer = new Uint8Array(await readFile(fontPath)).buffer;
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fontBufferCache.set(fontPath, buffer);
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return buffer;
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}
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