148 lines
4.8 KiB
C#
148 lines
4.8 KiB
C#
using UnityEngine;
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using UnityEngine.Networking;
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namespace YooAsset
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{
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internal class DownloadHandlerAssetBundleOperation : DefaultDownloadFileOperation
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{
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private readonly bool _disableUnityWebCache;
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private DownloadHandlerAssetBundle _downloadhandler;
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private ESteps _steps = ESteps.None;
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public AssetBundle Result { private set; get; }
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internal DownloadHandlerAssetBundleOperation(bool disableUnityWebCache, PackageBundle bundle, DownloadParam param) : base(bundle, param)
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{
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_disableUnityWebCache = disableUnityWebCache;
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}
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internal override void InternalOnStart()
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{
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_steps = ESteps.CreateRequest;
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}
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internal override void InternalOnUpdate()
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{
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if (_steps == ESteps.None || _steps == ESteps.Done)
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return;
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// 创建下载器
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if (_steps == ESteps.CreateRequest)
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{
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// 获取请求地址
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_requestURL = GetRequestURL();
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// 重置变量
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ResetRequestFiled();
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// 创建下载器
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CreateWebRequest();
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_steps = ESteps.CheckRequest;
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}
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// 检测下载结果
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if (_steps == ESteps.CheckRequest)
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{
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DownloadProgress = _webRequest.downloadProgress;
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DownloadedBytes = (long)_webRequest.downloadedBytes;
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Progress = DownloadProgress;
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if (_webRequest.isDone == false)
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{
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CheckRequestTimeout();
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return;
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}
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// 检查网络错误
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if (CheckRequestResult())
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{
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var assetBundle = _downloadhandler.assetBundle;
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if (assetBundle == null)
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{
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_steps = ESteps.Done;
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Error = "Download handler asset bundle object is null !";
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Status = EOperationStatus.Failed;
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}
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else
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{
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_steps = ESteps.Done;
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Result = assetBundle;
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Status = EOperationStatus.Succeed;
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}
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}
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else
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{
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_steps = ESteps.TryAgain;
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}
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// 注意：最终释放请求器
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DisposeWebRequest();
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}
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// 重新尝试下载
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if (_steps == ESteps.TryAgain)
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{
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if (FailedTryAgain <= 0)
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{
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Status = EOperationStatus.Failed;
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_steps = ESteps.Done;
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YooLogger.Error(Error);
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return;
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}
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_tryAgainTimer += Time.unscaledDeltaTime;
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if (_tryAgainTimer > 1f)
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{
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FailedTryAgain--;
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_steps = ESteps.CreateRequest;
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YooLogger.Warning(Error);
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}
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}
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}
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internal override void InternalOnAbort()
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{
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_steps = ESteps.Done;
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DisposeWebRequest();
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}
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private void CreateWebRequest()
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{
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_downloadhandler = CreateDownloadHandler();
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_webRequest = DownloadSystemHelper.NewUnityWebRequestGet(_requestURL);
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_webRequest.downloadHandler = _downloadhandler;
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_webRequest.disposeDownloadHandlerOnDispose = true;
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_webRequest.SendWebRequest();
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}
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private void DisposeWebRequest()
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{
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if (_webRequest != null)
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{
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//注意：引擎底层会自动调用Abort方法
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_webRequest.Dispose();
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_webRequest = null;
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}
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}
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private DownloadHandlerAssetBundle CreateDownloadHandler()
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{
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if (_disableUnityWebCache)
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{
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var downloadhandler = new DownloadHandlerAssetBundle(_requestURL, 0);
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#if UNITY_2020_3_OR_NEWER
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downloadhandler.autoLoadAssetBundle = false;
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#endif
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return downloadhandler;
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}
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else
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{
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// 注意：优先从浏览器缓存里获取文件
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// The file hash defining the version of the asset bundle.
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uint unityCRC = Bundle.UnityCRC;
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Hash128 fileHash = Hash128.Parse(Bundle.FileHash);
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var downloadhandler = new DownloadHandlerAssetBundle(_requestURL, fileHash, unityCRC);
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#if UNITY_2020_3_OR_NEWER
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downloadhandler.autoLoadAssetBundle = false;
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#endif
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return downloadhandler;
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}
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}
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}
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} |