three#Cache TypeScript Examples

The following examples show how to use three#Cache. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example #1
Source File: useArt.ts    From metaplex with Apache License 2.0 5 votes vote down vote up 
useCachedImage = (uri: string, cacheMesh?: boolean) => {
  const [cachedBlob, setCachedBlob] = useState<string | undefined>(undefined);
  const [isLoading, setIsLoading] = useState<boolean>(true);

  useEffect(() => {
    if (!uri) {
      return;
    }

    const result = cachedImages.get(uri);

    if (result) {
      setCachedBlob(result);
      return;
    }

    (async () => {
      let response: Response;
      let blob: Blob;
      try {
        response = await fetch(uri, { cache: 'force-cache' });

        blob = await response.blob();

        if (blob.size === 0) {
          throw new Error('No content');
        }
      } catch {
        try {
          response = await fetch(uri, { cache: 'reload' });
          blob = await response.blob();
        } catch {
          // If external URL, just use the uri
          if (uri?.startsWith('http')) {
            setCachedBlob(uri);
          }
          setIsLoading(false);
          return;
        }
      }

      if (blob.size === 0) {
        setIsLoading(false);
        return;
      }

      if (cacheMesh) {
        // extra caching for meshviewer
        Cache.enabled = true;
        Cache.add(uri, await blob.arrayBuffer());
      }
      const blobURI = URL.createObjectURL(blob);
      cachedImages.set(uri, blobURI);
      setCachedBlob(blobURI);
      setIsLoading(false);
    })();
  }, [uri, setCachedBlob, setIsLoading]);

  return { cachedBlob, isLoading };
}