utils.js

// Adapted from https://github.com/xenova/transformers.js/blob/c367f9d68b809bbbf81049c808bf6d219d761d23/src/utils/hub.js#L330
export async function getCachedFile(url) {
  let cache;
  try {
    cache = await caches.open("semantic-audio-search");
    const cachedResponse = await cache.match(url);
    if (cachedResponse) {
      return await cachedResponse.arrayBuffer();
    }
  } catch (e) {
    console.warn("Unable to open cache", e);
  }

  // No cache, or cache failed to open. Fetch the file.
  const response = await fetch(url);
  const buffer = await response.arrayBuffer();

  if (cache) {
    try {
      // NOTE: We use `new Response(buffer, ...)` instead of `response.clone()` to handle LFS files
      await cache.put(
        url,
        new Response(buffer, {
          headers: response.headers,
        }),
      );
    } catch (e) {
      console.warn("Unable to cache file", e);
    }
  }

  return buffer;
}

export async function getCachedJSON(url) {
  let buffer = await getCachedFile(url);

  let decoder = new TextDecoder("utf-8");
  let jsonData = decoder.decode(buffer);

  return JSON.parse(jsonData);
}