91 lines
3.0 KiB
C#
91 lines
3.0 KiB
C#
using System;
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using UnityEngine;
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using UnityEngine.Networking;
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namespace YooAsset
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{
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/// <summary>
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/// UnityWebRequest AssetBundle 下载器
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/// </summary>
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/// <remarks>
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/// 下载并加载 Unity AssetBundle 资源包。
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/// 支持 Unity 内置缓存机制和 CRC 校验。
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/// </remarks>
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internal sealed class UnityWebRequestAssetBundleDownloader : UnityWebRequestDownloaderBase, IDownloadAssetBundleRequest
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{
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private readonly DownloadAssetBundleRequestArgs _args;
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private DownloadHandlerAssetBundle _downloadHandler;
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/// <summary>
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/// 下载结果（AssetBundle 对象）
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/// </summary>
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public AssetBundle Result { get; private set; }
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/// <summary>
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/// 构造 AssetBundle 下载器
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/// </summary>
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/// <param name="args">AssetBundle 下载参数</param>
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/// <param name="webRequestCreator">UnityWebRequest 创建器（可选）</param>
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public UnityWebRequestAssetBundleDownloader(DownloadAssetBundleRequestArgs args, UnityWebRequestCreator webRequestCreator)
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: base(args.URL, webRequestCreator)
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{
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_args = args;
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}
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/// <summary>
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/// 创建 UnityWebRequest
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/// </summary>
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protected override void CreateWebRequest()
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{
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_downloadHandler = CreateAssetBundleDownloadHandler();
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_webRequest = CreateUnityWebRequestGet(URL);
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_webRequest.downloadHandler = _downloadHandler;
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_webRequest.disposeDownloadHandlerOnDispose = true;
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ApplyRequestOptions(_args.Timeout, _args.WatchdogTime, _args.Headers);
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}
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/// <summary>
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/// 请求成功时的回调
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/// </summary>
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protected override void OnRequestSucceed()
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{
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AssetBundle assetBundle = _downloadHandler.assetBundle;
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if (assetBundle == null)
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{
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Status = EDownloadRequestStatus.Failed;
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Error = $"[{GetType().Name}] URL: {URL} - AssetBundle object is null";
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}
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else
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{
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Result = assetBundle;
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}
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}
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/// <summary>
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/// 创建 AssetBundle 下载处理器
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/// </summary>
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private DownloadHandlerAssetBundle CreateAssetBundleDownloadHandler()
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{
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DownloadHandlerAssetBundle handler;
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if (_args.DisableUnityWebCache)
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{
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// 禁用 Unity 缓存
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handler = new DownloadHandlerAssetBundle(URL, _args.UnityCRC);
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}
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else
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{
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if (string.IsNullOrEmpty(_args.FileHash))
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throw new YooInternalException("File hash is null or empty!");
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// 使用 Unity 缓存
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// 说明：The file hash defining the version of the asset bundle.
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Hash128 fileHash = Hash128.Parse(_args.FileHash);
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handler = new DownloadHandlerAssetBundle(URL, fileHash, _args.UnityCRC);
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}
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return handler;
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}
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}
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}
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