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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,101 +1,94 @@ | ||
| import { useState, useEffect } from 'react'; | ||
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| export type ImageFetchStatus = 'loading' | 'loaded' | 'error'; | ||
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| type ImageFetchStateMap = { | ||
| loading: { status: 'loading' }; | ||
| loaded: { status: 'loaded'; imageSrc: string }; | ||
| error: { status: 'error'; imageSrc: string }; | ||
| }; | ||
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| export type UseFetchImageState = ImageFetchStateMap[ImageFetchStatus]; | ||
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| const maxConcurrentRequests = 5; | ||
| const requestQueue: Set<() => Promise<void>> = new Set(); | ||
| let concurrentRequestsCount = 0; | ||
|
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| const processNextRequest = async () => { | ||
| if (requestQueue.size > 0 && concurrentRequestsCount < maxConcurrentRequests) { | ||
| const [nextRequest] = requestQueue; | ||
| requestQueue.delete(nextRequest); | ||
| concurrentRequestsCount++; | ||
| try { | ||
| await nextRequest(); | ||
| } finally { | ||
| processNextRequest(); | ||
| } | ||
| } | ||
| }; | ||
|
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| const fetchImage = async (url: string, controller: AbortController) => { | ||
| const response = await fetch(url, { | ||
| signal: controller.signal, | ||
| headers: { 'Cache-Control': 'public, max-age=86400' } | ||
| }); | ||
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| if (!response.ok) throw new Error('Image fetch failed'); | ||
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| const blob = await response.blob(); | ||
| return URL.createObjectURL(blob); | ||
| }; | ||
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| export const useFetchImage = ({ url, fallbackImage }: { url: string; fallbackImage: string }) => { | ||
| const [state, setState] = useState<UseFetchImageState>({ status: 'loading' }); | ||
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| useEffect(() => { | ||
| let realUrl = url; | ||
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| if (url.startsWith('data:')) { | ||
| // TODO investigate the below problem + use getAssetImageUrl | ||
| // Solve broken links e.g. data:image/png;base64,https://storage.something.com/assets/1235 | ||
| const httpPosition = url.indexOf('http'); | ||
| if (httpPosition === -1) { | ||
| setState({ status: 'loaded', imageSrc: url }); | ||
| // eslint-disable-next-line @typescript-eslint/no-empty-function | ||
| return () => {}; | ||
| } | ||
|
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| realUrl = url.slice(httpPosition); | ||
| } | ||
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| const controller = new AbortController(); | ||
|
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| const loadImage = async () => { | ||
| try { | ||
| setState({ status: 'loading' }); | ||
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| const imageSrc = await fetchImage(realUrl, controller); | ||
|
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| setState({ status: 'loaded', imageSrc }); | ||
| } catch { | ||
| if (!controller.signal.aborted) { | ||
| setState({ status: 'error', imageSrc: fallbackImage }); | ||
| } | ||
| } finally { | ||
| concurrentRequestsCount--; | ||
| processNextRequest(); | ||
| } | ||
| }; | ||
|
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| if (concurrentRequestsCount < maxConcurrentRequests) { | ||
| concurrentRequestsCount++; | ||
| loadImage(); | ||
| } else { | ||
| requestQueue.add(loadImage); | ||
| } | ||
|
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| return () => { | ||
| controller.abort(); | ||
| requestQueue.delete(loadImage); | ||
| }; | ||
| }, [url, fallbackImage]); | ||
|
|
||
| return state; | ||
| }; | ||
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