cache for store chard

src/utils/storeChartCache.ts

@@ -0,0 +1,51 @@
+const STORE_CHART_CACHE_TTL = 5 * 60 * 1000;
+
+type StoreChartCacheEntry = {
+	data?: unknown;
+	cachedAt: number;
+	pending?: Promise<unknown>;
+};
+
+const cache = new Map<string, StoreChartCacheEntry>();
+let cacheGeneration = 0;
+
+/** 缓存门店图表请求结果，并合并同一数据的并发请求。 */
+export async function getStoreChartCache<T>(key: string, loader: () => Promise<T>): Promise<T> {
+	const now = Date.now();
+	const entry = cache.get(key);
+	if (entry?.data !== undefined && now - entry.cachedAt < STORE_CHART_CACHE_TTL) {
+		return entry.data as T;
+	}
+	if (entry?.pending) {
+		return await entry.pending as T;
+	}
+
+	const generation = cacheGeneration;
+	const pending = loader();
+	cache.set(key, {
+		data: entry?.data,
+		cachedAt: entry?.cachedAt || 0,
+		pending
+	});
+	try {
+		const data = await pending;
+		if (generation === cacheGeneration) {
+			cache.set(key, {
+				data,
+				cachedAt: Date.now()
+			});
+		}
+		return data;
+	} catch (error) {
+		if (cache.get(key)?.pending === pending) {
+			cache.delete(key);
+		}
+		throw error;
+	}
+}
+
+/** 清空门店图表缓存，并使清空前发起的请求不再回填缓存。 */
+export function clearStoreChartCache(): void {
+	cacheGeneration++;
+	cache.clear();
+}