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Image preloading should be rate limited, to not overload the server. Now it is set to max. 5 requests at the same time. Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>
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/** | ||
* SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors | ||
* SPDX-License-Identifier: AGPL-3.0-or-later | ||
*/ | ||
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import PQueue from 'p-queue' | ||
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const queue = new PQueue({ concurrency: 5 }) | ||
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/** | ||
* Preload an image URL | ||
* @param url URL of the image | ||
*/ | ||
export function preloadImage(url: string): Promise<boolean> { | ||
const { resolve, promise } = Promise.withResolvers<boolean>() | ||
queue.add(() => { | ||
const image = new Image() | ||
image.onerror = () => resolve(false) | ||
image.onload = () => resolve(true) | ||
image.src = url | ||
return promise | ||
}) | ||
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return promise | ||
} |
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