64 lines
1.5 KiB
TypeScript
64 lines
1.5 KiB
TypeScript
/*
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* Copyright (C) 2026 Fluxer Contributors
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*
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* This file is part of Fluxer.
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*
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* Fluxer is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Fluxer is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with Fluxer. If not, see <https://www.gnu.org/licenses/>.
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*/
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import {LRUCache} from 'lru-cache';
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interface ImageCacheEntry {
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loaded: boolean;
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}
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const imageCache = new LRUCache<string, ImageCacheEntry>({
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max: 500,
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ttl: 1000 * 60 * 10,
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});
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const isCached = (src: string | null): boolean => {
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if (!src) return false;
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return imageCache.has(src);
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};
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export const hasImage = (src: string | null): boolean => {
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return isCached(src);
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};
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export const loadImage = (src: string | null, onLoad: () => void, onError?: () => void): void => {
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if (!src) {
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onError?.();
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return;
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}
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if (imageCache.has(src)) {
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onLoad();
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return;
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}
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const image = new Image();
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image.onload = () => {
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imageCache.set(src, {loaded: true});
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onLoad();
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};
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image.onerror = () => {
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onError?.();
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};
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image.src = src;
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};
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