91 lines
3.2 KiB
C#
91 lines
3.2 KiB
C#
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using System.IO;
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namespace YooAsset
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{
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internal class DownloadPackageManifestOperation : AsyncOperationBase
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{
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private enum ESteps
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{
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None,
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CheckExist,
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DownloadFile,
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Done,
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}
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private readonly DefaultCacheFileSystem _fileSystem;
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private readonly string _packageVersion;
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private readonly int _timeout;
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private UnityWebFileRequestOperation _webFileRequestOp;
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private int _requestCount = 0;
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private ESteps _steps = ESteps.None;
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internal DownloadPackageManifestOperation(DefaultCacheFileSystem fileSystem, string packageVersion, int timeout)
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{
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_fileSystem = fileSystem;
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_packageVersion = packageVersion;
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_timeout = timeout;
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}
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internal override void InternalOnStart()
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{
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_requestCount = WebRequestCounter.GetRequestFailedCount(_fileSystem.PackageName, nameof(DownloadPackageManifestOperation));
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_steps = ESteps.CheckExist;
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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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if (_steps == ESteps.CheckExist)
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{
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string filePath = _fileSystem.GetCachePackageManifestFilePath(_packageVersion);
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if (File.Exists(filePath))
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{
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_steps = ESteps.Done;
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Status = EOperationStatus.Succeed;
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}
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else
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{
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_steps = ESteps.DownloadFile;
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}
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}
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if (_steps == ESteps.DownloadFile)
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{
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if (_webFileRequestOp == null)
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{
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string savePath = _fileSystem.GetCachePackageManifestFilePath(_packageVersion);
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string fileName = YooAssetSettingsData.GetManifestBinaryFileName(_fileSystem.PackageName, _packageVersion);
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string webURL = GetDownloadRequestURL(fileName);
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_webFileRequestOp = new UnityWebFileRequestOperation(webURL, savePath, _timeout);
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OperationSystem.StartOperation(_fileSystem.PackageName, _webFileRequestOp);
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}
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if (_webFileRequestOp.IsDone == false)
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return;
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if (_webFileRequestOp.Status == EOperationStatus.Succeed)
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{
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_steps = ESteps.Done;
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Status = EOperationStatus.Succeed;
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}
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else
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{
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_steps = ESteps.Done;
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Status = EOperationStatus.Failed;
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Error = _webFileRequestOp.Error;
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WebRequestCounter.RecordRequestFailed(_fileSystem.PackageName, nameof(DownloadPackageManifestOperation));
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}
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}
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}
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private string GetDownloadRequestURL(string fileName)
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{
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// 轮流返回请求地址
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if (_requestCount % 2 == 0)
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return _fileSystem.RemoteServices.GetRemoteMainURL(fileName);
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else
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return _fileSystem.RemoteServices.GetRemoteFallbackURL(fileName);
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}
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}
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}
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