I am writing an network asset importer to allow me to keep large assets out of my git repo, deduplicate assets, etc. I was wondering if it was possible to write a asynchronous file importer or even if not is it possible to run unity a UnityWebRequest synchronously.
I can't start a coroutine in this content, and while I can start a task, attempting to wait for it to finish results in it never finishing, and it seems I can't write to context outside of `public override void OnImportAsset(AssetImportContext ctx)` (causes a crash) Any thoughts on if this is possible to do somehow. Thread.sleep causes hang, as does just looping.
using UnityEngine;
using UnityEditor.Experimental.AssetImporters;
using System.IO;
using UnityEngine.Networking;
using System;
using System.Threading;
using System.Collections;
using System.Threading.Tasks;
[ScriptedImporter(1, "ipfs")]
public class CubeImporter : ScriptedImporter
{
public float m_Scale = 1;
public string uriStr;
public Uri ipfsGateway = new Uri("http://localhost:8080");
public Texture2D debugTexture;
private IEnumerator DoIt(AssetImportContext ctx, Uri uri)
{
using (UnityWebRequest www = UnityWebRequestTexture.GetTexture(uri))
{
var asyncOp = www.SendWebRequest();
yield return asyncOp;
var texture = DownloadHandlerTexture.GetContent(www);
ctx.AddObjectToAsset("main obj", texture);
ctx.SetMainObject(texture);
}
}
private async Task DoItAsync(AssetImportContext ctx, Uri uri)
{
using (UnityWebRequest www = UnityWebRequestTexture.GetTexture(uri))
{
var asyncOp = www.SendWebRequest();
while (asyncOp.isDone == false)
{
await Task.Delay(1000 / 30);//30 hertz
}
if (www.isNetworkError || www.isHttpError)
{
Debug.LogError($"{ www.error }, URL:{ www.url }");
return;
}
var texture = DownloadHandlerTexture.GetContent(www);
Debug.Log($"{texture}, URL:{ www.url }");
debugTexture = texture;
ctx.AddObjectToAsset("main obj", texture);
ctx.SetMainObject(texture);
}
}
public override void OnImportAsset(AssetImportContext ctx)
{
var ipfs = File.ReadAllText(ctx.assetPath);
var uri = new Uri(ipfsGateway, ipfs);
uriStr = uri.AbsoluteUri;
var texture = new Texture2D(512, 512);
var task = DoItAsync(ctx, uri);
//task.Wait();
//ctx.AddObjectToAsset("main obj", texture);
//ctx.SetMainObject(texture);
//task.Wait();
// 'cube' is a a GameObject and will be automatically converted into a Prefab
// (Only the 'Main Asset' is elligible to become a Prefab.)
//var material = new Material(Shader.Find("Standard"));
//material.color = Color.red;
//// Assets must be assigned a unique identifier string consistent across imports
//ctx.AddObjectToAsset("my Material", material);
//// Assets that are not passed into the context as import outputs must be destroyed
//var tempMesh = new Mesh();
//DestroyImmediate(tempMesh);
}
}
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