How to load bundles dynamically from a custom structure?

Unity Engine
1

I have a server that I don’t have access to (can’t modify structure). I want to load the list of asset bundles from the server, cache and load them in runtime. What is the best way to do this?

Example:

//[
//  {
//    "id": "01"
//    "name": "bundle_01",
//    "bundleUri": "https://cdn.example.net/assetbundles/bundle_01",
//    "manifestUri": "https://cdn.example.net/assetbundles/bundle_01.manifest",
//    "updatedOn": "2020-06-07T15:00:00.000000",
//  }
//]

public class CustomBundleData
{
    public string name;
    public string bundleUri;
    public string manifestUri;
    public DateTime updatedOn;
}

public class Loader : MonoBehaviour
{
    private void Start()
    {
        const string url = "http://example.com/bundles.json";
        StartCoroutine(LoadBundleList(url));
    }

    private IEnumerator LoadBundleList(string url)
    {
        var request = UnityWebRequest.Get(url);
        yield return request.SendWebRequest();

        string json = request.downloadHandler.text;
        var list = JsonConvert.DeserializeObject<List<CustomBundleData>>(json);

        foreach (CustomBundleData data in list)
        {
            // if not cached or cache invalid (by 'data.updatedOn'/manifest)
            //   download
            //   cache
            //
            // load bundle
        }
    }

    private void LoadAsset<T>(string key, Action<T> onSuccess, Action onError)
    {
        Addressables.LoadAssetAsync<T>(key)
            .Completed += (AsyncOperationHandle<T> asset) =>
            {
                if (asset.Status == AsyncOperationStatus.Succeeded)
                {
                    onSuccess(asset.Result);
                    return;
                }

                onError();
            };
    }
}
2

Bump

3

It looks like that was meant to work with old assetbundles. Check out SadPanda’s AssetBundleManager or older Unity’s AssetBundleManager.

4

Thanks for the reply, but I don’t want to use the legacy system (I have a custom solution for it).
And I can’t switch to Addressables because I must load assets from the server by json in runtime.