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33 changes: 33 additions & 0 deletions
33
tools-nodejs/vighnesh153-astro/website/src/components/ImageWithCache.tsx
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,33 @@ | ||
| import { createEffect, createSignal, type JSX, Show } from "solid-js"; | ||
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| import { cacheImage } from "@/utils/image_caching.ts"; | ||
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| export type ImageWithCacheProps = { | ||
| src: string; | ||
| cacheKey: string; | ||
| ttlMillis?: number; | ||
| fallback?: JSX.Element; | ||
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| imageProps?: JSX.ImgHTMLAttributes<HTMLImageElement>; | ||
| }; | ||
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| export function ImageWithCache(props: ImageWithCacheProps): JSX.Element { | ||
| const [objUrl, setObjUrl] = createSignal<string | null>(null); | ||
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| createEffect(async () => { | ||
| try { | ||
| const cachedUrl = await cacheImage(props.src, props.cacheKey, { | ||
| ttlMillis: props.ttlMillis, | ||
| }); | ||
| setObjUrl(cachedUrl); | ||
| } catch (e) { | ||
| console.log(e); | ||
| } | ||
| }); | ||
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| return ( | ||
| <Show when={objUrl() !== null} fallback={props.fallback}> | ||
| <img {...props.imageProps} src={objUrl()!} /> | ||
| </Show> | ||
| ); | ||
| } |
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86 changes: 86 additions & 0 deletions
86
tools-nodejs/vighnesh153-astro/website/src/utils/image_caching.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,86 @@ | ||
| import { milliseconds } from "@vighnesh153/tools"; | ||
| import localforage from "localforage"; | ||
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| const defaultCacheTtl = milliseconds({ years: 1 }); | ||
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| const imageStore = localforage.createInstance({ | ||
| name: "vighnesh153-images", | ||
| }); | ||
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| const imageTtlStore = localforage.createInstance({ | ||
| name: "vighnesh153-images-ttl", | ||
| }); | ||
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| export type CacheImageOptions = { | ||
| ttlMillis?: number; | ||
| }; | ||
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| export async function cacheImage( | ||
| networkUri: string, | ||
| cacheKey: string, | ||
| { ttlMillis = defaultCacheTtl }: CacheImageOptions = {}, | ||
| ): Promise<string> { | ||
| return navigator.locks.request(`images-${cacheKey}`, async () => { | ||
| const existingImage = await getImageObjUrl(cacheKey); | ||
| if (existingImage !== null) { | ||
| return existingImage; | ||
| } | ||
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| return new Promise(async (resolve, reject) => { | ||
| const blob = await fetch(networkUri).then((res) => res.blob()); | ||
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| const reader = new FileReader(); | ||
| reader.onload = () => { | ||
| const objectUrl = reader.result as string; | ||
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| imageStore.setItem(cacheKey, objectUrl).then(async () => { | ||
| resolve(objectUrl); | ||
| await imageTtlStore.setItem(cacheKey, Date.now() + ttlMillis); | ||
| }); | ||
| }; | ||
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| try { | ||
| reader.readAsDataURL(blob); | ||
| } catch (e) { | ||
| reject(e); | ||
| } | ||
| }); | ||
| }); | ||
| } | ||
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| async function getImageObjUrl(cacheKey: string): Promise<string | null> { | ||
| const ttl = await imageTtlStore.getItem(cacheKey); | ||
| if (typeof ttl !== "number") { | ||
| // either ttl doesn't exist or is corrupted for this cache key | ||
| return null; | ||
| } | ||
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| if (ttl < Date.now()) { | ||
| // Cache expired | ||
| return null; | ||
| } | ||
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| const maybeImageObjUrl = await imageStore.getItem(cacheKey); | ||
| if (typeof maybeImageObjUrl === "string") { | ||
| return maybeImageObjUrl; | ||
| } | ||
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| // imageObjUrl is corrupted | ||
| return null; | ||
| } | ||
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| export async function cleanupExpiredImages() { | ||
| const imageKeys = await imageStore.keys(); | ||
| const ttlKeys = await imageTtlStore.keys(); | ||
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| for (const key of new Set([...imageKeys, ...ttlKeys])) { | ||
| const objUrl = await imageStore.getItem(key); | ||
| const ttl = await imageTtlStore.getItem(key); | ||
| if ( | ||
| typeof objUrl !== "string" || typeof ttl !== "number" || ttl < Date.now() | ||
| ) { | ||
| await imageStore.removeItem(key); | ||
| await imageTtlStore.removeItem(key); | ||
| } | ||
| } | ||
| } |