接口侧： - cache.ts 改为 stale-while-revalidate：每个 key 自调度，TTL 到期前 5s 后台刷新，用户永远命中热缓存 - 闲置 10 分钟后停止调度，避免空跑 - loader 失败保留旧值 + 10s 后退避重试 - 所有 4 个端点支持 ?force=1 强制绕过缓存 前端 HydrogenOverview： - 顶部加 RefreshCw 按钮（强刷绕过缓存），带旋转动画 - 显示"更新于 X 秒前"相对时间 - 刷新中：顶部 0.5px 流光进度条，不替换内容、不闪烁 - 60s 静默自动刷新（命中后端热缓存） 实测：cold 6.1s → 命中 13ms（470× 提速） Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
kkfluous
co-authored by
Claude Opus 4.7
Claude Opus 4.7
parent
6ad4b5e2a4
commit
f06b0d21eb
@@ -1,44 +1,135 @@
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/**
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* 简单 TTL 内存缓存。
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* 命中：直接返回缓存值；过期或未命中：运行 loader、存入缓存。
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* 同一 key 并发请求只会触发一次 loader（共享 in-flight Promise）。
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* SWR 缓存：始终返回热数据，后台定时刷新。
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*
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* 工作机制：
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* - 首次请求：阻塞等待 loader（cold start，3-4s 不可避免）
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* - 之后：每个 key 自调度刷新（TTL 到期前 5s），用户永远命中热缓存
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* - 闲置 IDLE_TIMEOUT_MS 后取消调度（避免浪费 DB 资源）
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* - 同一 key 并发请求只触发一次 loader
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* - force=true：手动强制刷新，绕过缓存（但仍参与 inflight 复用）
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*/
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interface Entry<T> {
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value: T;
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freshAt: number;
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expiresAt: number;
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loader: () => Promise<T>;
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lastAccess: number;
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timer?: NodeJS.Timeout;
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}
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const TTL_MS = 60 * 1000;
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const REFRESH_LEAD_MS = 5 * 1000; // TTL 到期前多久触发刷新
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const IDLE_TIMEOUT_MS = 10 * 60 * 1000; // 10 分钟无访问则停止调度
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const RETRY_BACKOFF_MS = 10 * 1000; // loader 失败时重试间隔
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const cache = new Map<string, Entry<unknown>>();
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const inflight = new Map<string, Promise<unknown>>();
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export async function cached<T>(key: string, loader: () => Promise<T>): Promise<T> {
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function scheduleRefresh<T>(key: string, entry: Entry<T>) {
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if (entry.timer) clearTimeout(entry.timer);
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const delay = Math.max(0, entry.freshAt + TTL_MS - Date.now() - REFRESH_LEAD_MS);
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entry.timer = setTimeout(() => { void runRefresh(key); }, delay);
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entry.timer.unref?.();
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}
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async function runRefresh(key: string) {
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const entry = cache.get(key) as Entry<unknown> | undefined;
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if (!entry) return;
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// 闲置超时：停止调度
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if (Date.now() - entry.lastAccess > IDLE_TIMEOUT_MS) {
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if (entry.timer) clearTimeout(entry.timer);
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return;
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}
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if (inflight.has(key)) return;
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const p = entry.loader()
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.then(value => {
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const now = Date.now();
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const next: Entry<unknown> = {
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value,
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freshAt: now,
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expiresAt: now + TTL_MS,
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loader: entry.loader,
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lastAccess: entry.lastAccess,
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};
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cache.set(key, next);
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scheduleRefresh(key, next);
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return value;
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})
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.catch(e => {
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console.error(`[energy/cache] refresh failed for "${key}":`, e instanceof Error ? e.message : e);
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// 保留旧值，10s 后重试
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const retry: Entry<unknown> = { ...entry };
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retry.timer = setTimeout(() => { void runRefresh(key); }, RETRY_BACKOFF_MS);
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retry.timer.unref?.();
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cache.set(key, retry);
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})
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.finally(() => inflight.delete(key));
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inflight.set(key, p);
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}
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export interface CachedOpts {
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force?: boolean;
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}
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export async function cached<T>(key: string, loader: () => Promise<T>, opts: CachedOpts = {}): Promise<T> {
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const now = Date.now();
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const hit = cache.get(key);
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if (hit && hit.expiresAt > now) {
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return hit.value as T;
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const hit = cache.get(key) as Entry<T> | undefined;
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if (hit) {
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hit.lastAccess = now;
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hit.loader = loader;
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}
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// 同一 key 并发只跑一次 loader
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// 强制刷新：等待 loader 完成
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if (opts.force) {
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const ongoing = inflight.get(key) as Promise<T> | undefined;
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if (ongoing) return ongoing;
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const p = loader()
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.then(value => {
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const t = Date.now();
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const next: Entry<T> = { value, freshAt: t, expiresAt: t + TTL_MS, loader, lastAccess: t };
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cache.set(key, next);
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scheduleRefresh(key, next);
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return value;
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})
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.finally(() => inflight.delete(key));
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inflight.set(key, p as Promise<unknown>);
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return p;
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}
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// 命中且未过期 → 立即返回
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if (hit && hit.expiresAt > now) {
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return hit.value;
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}
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// 命中但过期 → 返回 stale，后台刷新
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if (hit) {
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if (!inflight.has(key)) void runRefresh(key);
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return hit.value;
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}
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// 完全未命中 → 阻塞等待
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const ongoing = inflight.get(key) as Promise<T> | undefined;
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if (ongoing) return ongoing;
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const p = loader()
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.then(value => {
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cache.set(key, { value, expiresAt: Date.now() + TTL_MS });
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const t = Date.now();
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const entry: Entry<T> = { value, freshAt: t, expiresAt: t + TTL_MS, loader, lastAccess: t };
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cache.set(key, entry);
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scheduleRefresh(key, entry);
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return value;
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})
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.finally(() => {
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inflight.delete(key);
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});
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.finally(() => inflight.delete(key));
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inflight.set(key, p as Promise<unknown>);
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return p;
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}
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/** 仅用于测试或调试：清空所有缓存 */
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/** 仅用于测试或调试：清空所有缓存与定时器 */
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export function _clearEnergyCache() {
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for (const e of cache.values()) {
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if (e.timer) clearTimeout(e.timer);
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}
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cache.clear();
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inflight.clear();
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}
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@@ -61,6 +61,7 @@ function enumerateDates(range: Range): string[] {
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// =========================================================
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app.get('/hydrogen/overview', async (c) => {
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const yearParam = c.req.query('year');
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const force = c.req.query('force') === '1';
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const today = new Date();
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const todayYear = today.getFullYear();
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const requestedYear = yearParam ? Number(yearParam) || todayYear : todayYear;
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@@ -303,7 +304,7 @@ app.get('/hydrogen/overview', async (c) => {
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}));
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return { kpi, top5, regions, monthly, customers, stations, availableYears, year };
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});
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}, { force });
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return c.json(data);
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});
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@@ -313,6 +314,7 @@ app.get('/hydrogen/overview', async (c) => {
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app.get('/hydrogen/daily', async (c) => {
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const range = (c.req.query('range') || 'last15') as Range;
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const customer = (c.req.query('customer') || 'external') as CustomerKind;
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const force = c.req.query('force') === '1';
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const data = await cached(`hydrogen/daily?range=${range}&customer=${customer}`, async () => {
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@@ -423,7 +425,7 @@ app.get('/hydrogen/daily', async (c) => {
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// 按日期降序返回
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const result = ascDays.slice().sort((a, b) => b.date.localeCompare(a.date));
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return result;
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});
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}, { force });
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return c.json(data);
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});
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@@ -431,6 +433,7 @@ app.get('/hydrogen/daily', async (c) => {
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// 电能 总览：KPI + 本月每日柱图数据 —— 数据源：bi_ele_charge_record
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// =========================================================
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app.get('/electric/overview', async (c) => {
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const force = c.req.query('force') === '1';
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const data = await cached('electric/overview', async () => {
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const [kpiRows] = await pool.query<RowDataPacket[]>(
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`SELECT
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@@ -504,7 +507,7 @@ app.get('/electric/overview', async (c) => {
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kpi: { totalKwh, totalFee, monthKwh, monthFee, todayKwh, todayFee, todayChainPct },
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trend: trendArr,
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};
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});
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}, { force });
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return c.json(data);
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});
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@@ -516,6 +519,7 @@ app.get('/electric/overview', async (c) => {
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app.get('/electric/monthly', async (c) => {
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const customer = (c.req.query('customer') || 'lingniu') as CustomerKind;
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const range = (c.req.query('range') || 'last15') as Range;
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const force = c.req.query('force') === '1';
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const data = await cached(`electric/monthly?customer=${customer}&range=${range}`, async () => {
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@@ -590,7 +594,7 @@ app.get('/electric/monthly', async (c) => {
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});
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return months;
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});
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}, { force });
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return c.json(data);
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});
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