perf: virtualize management lists and make drag sorting opt-in

src/utils/siteIconCache.ts

@@ -0,0 +1,52 @@
+type SiteIconCacheEntry = {
+  expiresAt: number
+  value: string
+}
+
+const SITE_ICON_CACHE_TTL = 10 * 60 * 1000
+const siteIconCache = new Map<string, SiteIconCacheEntry>()
+const siteIconRequests = new Map<string, Promise<string>>()
+
+function readCachedSiteIcon(key: string): string | undefined {
+  const entry = siteIconCache.get(key)
+  if (!entry) {
+    return undefined
+  }
+
+  if (entry.expiresAt <= Date.now()) {
+    siteIconCache.delete(key)
+    return undefined
+  }
+
+  return entry.value
+}
+
+export async function getCachedSiteIcon(siteId: string | number, loader: () => Promise<string>): Promise<string> {
+  const cacheKey = String(siteId)
+  const cachedIcon = readCachedSiteIcon(cacheKey)
+  if (cachedIcon !== undefined) {
+    return cachedIcon
+  }
+
+  const currentRequest = siteIconRequests.get(cacheKey)
+  if (currentRequest) {
+    return currentRequest
+  }
+
+  const request = loader()
+    .then(icon => {
+      siteIconCache.set(cacheKey, {
+        expiresAt: Date.now() + SITE_ICON_CACHE_TTL,
+        value: icon,
+      })
+
+      return icon
+    })
+    .finally(() => {
+      siteIconRequests.delete(cacheKey)
+    })
+
+  siteIconRequests.set(cacheKey, request)
+
+  return request
+}