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feat: enhance website icon loading mechanism; implement icon loading state management and error handling

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shuaiplus
2026-05-09 23:00:56 +08:00
parent 5809e3eebc
commit 7afb496eb0
3 changed files with 74 additions and 86 deletions
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webapp/src/lib/website-icon-cache.ts
+5 -51
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@@ -1,10 +1,7 @@
type WebsiteIconStatus = 'idle' | 'loading' | 'loaded' | 'error';
const ICON_LOAD_TIMEOUT_MS = 5000;
interface WebsiteIconRecord {
status: WebsiteIconStatus;
promise: Promise<WebsiteIconStatus> | null;
imageUrl: string | null;
listeners: Set<(status: WebsiteIconStatus) => void>;
}
@@ -16,7 +13,6 @@ function ensureRecord(host: string): WebsiteIconRecord {
if (!record) {
record = {
status: 'idle',
promise: null,
imageUrl: null,
listeners: new Set(),
};
@@ -55,7 +51,6 @@ export function subscribeWebsiteIconStatus(host: string, listener: (status: Webs
export function markWebsiteIconLoaded(host: string, imageUrl?: string): void {
if (!host) return;
const record = ensureRecord(host);
record.promise = null;
if (imageUrl) {
record.imageUrl = imageUrl;
}
@@ -65,56 +60,15 @@ export function markWebsiteIconLoaded(host: string, imageUrl?: string): void {
export function markWebsiteIconErrored(host: string): void {
if (!host) return;
const record = ensureRecord(host);
record.promise = null;
record.imageUrl = null;
notifyRecord(host, 'error');
}
function blobToDataUrl(blob: Blob): Promise<string> {
return new Promise((resolve, reject) => {
const reader = new FileReader();
reader.onload = () => resolve(typeof reader.result === 'string' ? reader.result : '');
reader.onerror = () => reject(reader.error || new Error('Failed to read icon'));
reader.readAsDataURL(blob);
});
}
export function preloadWebsiteIcon(host: string, src: string): Promise<WebsiteIconStatus> {
if (!host) return Promise.resolve('error');
export function beginWebsiteIconLoad(host: string, src: string): boolean {
if (!host || !src) return false;
const record = ensureRecord(host);
if (record.status === 'loaded' || record.status === 'error') {
return Promise.resolve(record.status);
}
if (record.promise) {
return record.promise;
}
if (record.status !== 'idle') return false;
record.imageUrl = src;
notifyRecord(host, 'loading');
record.promise = (async () => {
const controller = new AbortController();
const timeout = window.setTimeout(() => controller.abort(), ICON_LOAD_TIMEOUT_MS);
try {
const resp = await fetch(src, {
cache: 'force-cache',
signal: controller.signal,
});
if (!resp.ok) throw new Error('Icon unavailable');
const contentType = String(resp.headers.get('Content-Type') || '').toLowerCase();
if (!contentType.startsWith('image/')) throw new Error('Icon response is not an image');
const blob = await resp.blob();
if (!blob.size) throw new Error('Icon response is empty');
const imageUrl = await blobToDataUrl(blob);
if (!imageUrl) throw new Error('Icon response is empty');
markWebsiteIconLoaded(host, imageUrl);
return 'loaded';
} catch {
markWebsiteIconErrored(host);
return 'error';
} finally {
window.clearTimeout(timeout);
}
})();
return record.promise;
return true;
}