update file system

Assets/YooAsset/Runtime/FileSystem/DefaultCacheFileSystem/Operation/DCFSClearAllBundleFilesOperation.cs

@@ -36,8 +36,8 @@ namespace YooAsset
             {
                 _allBundleGUIDs = _fileSystem.GetAllCachedBundleGUIDs();
                 _fileTotalCount = _allBundleGUIDs.Count;
-                YooLogger.Log($"Found all cache file count : {_fileTotalCount}");
                 _steps = ESteps.ClearAllCacheFiles;
+                YooLogger.Log($"Found all cache files count : {_fileTotalCount}");
             }
 
             if (_steps == ESteps.ClearAllCacheFiles)

Assets/YooAsset/Runtime/FileSystem/DefaultCacheFileSystem/Operation/DCFSClearUnusedBundleFilesOperation.cs

@@ -35,11 +35,11 @@ namespace YooAsset
                 return;
 
             if (_steps == ESteps.GetUnusedCacheFiles)
-            {
-                _steps = ESteps.ClearUnusedCacheFiles;
+            {    
                 _unusedBundleGUIDs = GetUnusedBundleGUIDs();
                 _unusedFileTotalCount = _unusedBundleGUIDs.Count;
-                YooLogger.Log($"Found unused cache file count : {_unusedFileTotalCount}");
+                _steps = ESteps.ClearUnusedCacheFiles;
+                YooLogger.Log($"Found unused cache files count : {_unusedFileTotalCount}");
             }
 
             if (_steps == ESteps.ClearUnusedCacheFiles)

Assets/YooAsset/Runtime/FileSystem/DefaultCacheFileSystem/Operation/DCFSDownloadFileOperation.cs

@@ -11,9 +11,7 @@ namespace YooAsset
         private string _tempFilePath;
         private ESteps _steps = ESteps.None;
 
-        internal DCFSDownloadNormalFileOperation(DefaultCacheFileSystem fileSystem, PackageBundle bundle, 
-            string mainURL, string fallbackURL, int failedTryAgain, int timeout)
-            : base(bundle, mainURL, fallbackURL, failedTryAgain, timeout)
+        internal DCFSDownloadNormalFileOperation(DefaultCacheFileSystem fileSystem, PackageBundle bundle, DownloadParam param) : base(bundle, param)
         {
             _fileSystem = fileSystem;
         }
@@ -110,7 +108,7 @@ namespace YooAsset
                     }
                     else
                     {
-                        Error = $"{_fileSystem.GetType().FullName} write file failed !";
+                        Error = $"{_fileSystem.GetType().FullName} failed to write file !";
                         Status = EOperationStatus.Failed;
                         _steps = ESteps.Done;
                         YooLogger.Error(Error);
@@ -198,19 +196,17 @@ namespace YooAsset
         private DownloadHandlerFileRange _downloadHandle;
         private VerifyTempFileOperation _verifyOperation;
         private long _fileOriginLength = 0;
-        private string _fileSavePath;
+        private string _tempFilePath;
         private ESteps _steps = ESteps.None;
 
 
-        internal DCFSDownloadResumeFileOperation(DefaultCacheFileSystem fileSystem, PackageBundle bundle,
-            string mainURL, string fallbackURL, int failedTryAgain, int timeout)
-                 : base(bundle, mainURL, fallbackURL, failedTryAgain, timeout)
+        internal DCFSDownloadResumeFileOperation(DefaultCacheFileSystem fileSystem, PackageBundle bundle, DownloadParam param) : base(bundle, param)
         {
             _fileSystem = fileSystem;
         }
         internal override void InternalOnStart()
         {
-            _fileSavePath = _fileSystem.GetTempFilePath(Bundle);
+            _tempFilePath = _fileSystem.GetTempFilePath(Bundle);
             _steps = ESteps.CheckExists;
         }
         internal override void InternalOnUpdate()
@@ -235,7 +231,7 @@ namespace YooAsset
             // 创建下载器
             if (_steps == ESteps.CreateRequest)
             {
-                FileUtility.CreateFileDirectory(_fileSavePath);
+                FileUtility.CreateFileDirectory(_tempFilePath);
 
                 // 获取请求地址
                 _requestURL = GetRequestURL();
@@ -246,9 +242,9 @@ namespace YooAsset
                 // 获取下载起始位置
                 _fileOriginLength = 0;
                 long fileBeginLength = -1;
-                if (File.Exists(_fileSavePath))
+                if (File.Exists(_tempFilePath))
                 {
-                    FileInfo fileInfo = new FileInfo(_fileSavePath);
+                    FileInfo fileInfo = new FileInfo(_tempFilePath);
                     fileBeginLength = fileInfo.Length;
                     _fileOriginLength = fileBeginLength;
                     DownloadedBytes = _fileOriginLength;
@@ -258,8 +254,8 @@ namespace YooAsset
                 if (fileBeginLength >= Bundle.FileSize)
                 {
                     // 删除临时文件
-                    if (File.Exists(_fileSavePath))
-                        File.Delete(_fileSavePath);
+                    if (File.Exists(_tempFilePath))
+                        File.Delete(_tempFilePath);
                 }
 
                 // 创建下载器
@@ -295,7 +291,7 @@ namespace YooAsset
             // 验证下载文件
             if (_steps == ESteps.VerifyTempFile)
             {
-                var element = new TempFileElement(_fileSavePath, Bundle.FileCRC, Bundle.FileSize);
+                var element = new TempFileElement(_tempFilePath, Bundle.FileCRC, Bundle.FileSize);
                 _verifyOperation = new VerifyTempFileOperation(element);
                 OperationSystem.StartOperation(_fileSystem.PackageName, _verifyOperation);
                 _steps = ESteps.CheckVerifyTempFile;
@@ -309,14 +305,14 @@ namespace YooAsset
 
                 if (_verifyOperation.Status == EOperationStatus.Succeed)
                 {
-                    if (_fileSystem.WriteCacheFile(Bundle, _fileSavePath))
+                    if (_fileSystem.WriteCacheFile(Bundle, _tempFilePath))
                     {
                         Status = EOperationStatus.Succeed;
                         _steps = ESteps.Done;
                     }
                     else
                     {
-                        Error = $"{_fileSystem.GetType().FullName} write file failed : {_fileSavePath}";
+                        Error = $"{_fileSystem.GetType().FullName} failed to write file !";
                         Status = EOperationStatus.Failed;
                         _steps = ESteps.Done;
                     }
@@ -328,8 +324,8 @@ namespace YooAsset
                 }
 
                 // 注意：验证完成后直接删除文件
-                if (File.Exists(_fileSavePath))
-                    File.Delete(_fileSavePath);
+                if (File.Exists(_tempFilePath))
+                    File.Delete(_tempFilePath);
             }
 
             // 重新尝试下载
@@ -381,7 +377,7 @@ namespace YooAsset
         {
             _webRequest = DownloadSystemHelper.NewUnityWebRequestGet(_requestURL);
 #if UNITY_2019_4_OR_NEWER
-            var handler = new DownloadHandlerFile(_fileSavePath, true);
+            var handler = new DownloadHandlerFile(_tempFilePath, true);
             handler.removeFileOnAbort = false;
 #else
             var handler = new DownloadHandlerFileRange(FileSavePath, Bundle.FileSize, _webRequest);
@@ -416,8 +412,8 @@ namespace YooAsset
             //说明：如果遇到以下错误返回码，验证失败直接删除文件
             if (_fileSystem.ResumeDownloadResponseCodes.Contains(HttpCode))
             {
-                if (File.Exists(_fileSavePath))
-                    File.Delete(_fileSavePath);
+                if (File.Exists(_tempFilePath))
+                    File.Delete(_tempFilePath);
             }
         }
     }

Assets/YooAsset/Runtime/FileSystem/DefaultCacheFileSystem/Operation/DCFSInitializeOperation.cs

@@ -1,6 +1,4 @@
-using System.IO;
-using UnityEngine;
-
+
 namespace YooAsset
 {
     internal class DCFSInitializeOperation : FSInitializeFileSystemOperation
@@ -43,7 +41,7 @@ namespace YooAsset
                 {
                     _fileSytem.DeleteAllManifestFiles();
                     appFootPrint.Coverage(_fileSytem.PackageName);
-                    YooLogger.Log("Delete manifest files when application foot print dirty !");
+                    YooLogger.Warning("Delete manifest files when application foot print dirty !");
                 }
 
                 _steps = ESteps.SearchCacheFiles;
@@ -76,11 +74,18 @@ namespace YooAsset
                 if (_verifyCacheFilesOp.IsDone == false)
                     return;
 
-                // 注意：总是返回成功
-                _steps = ESteps.Done;
-                Status = EOperationStatus.Succeed;
-
-                YooLogger.Log($"Package '{_fileSytem.PackageName}' cached files count : {_fileSytem.FileCount}");
+                if (_verifyCacheFilesOp.Status == EOperationStatus.Succeed)
+                {
+                    _steps = ESteps.Done;
+                    Status = EOperationStatus.Succeed;
+                    YooLogger.Log($"Package '{_fileSytem.PackageName}' cached files count : {_fileSytem.FileCount}");
+                }
+                else
+                {
+                    _steps = ESteps.Done;
+                    Status = EOperationStatus.Failed;
+                    Error = _verifyCacheFilesOp.Error;
+                }
             }
         }
     }

Assets/YooAsset/Runtime/FileSystem/DefaultCacheFileSystem/Operation/DCFSLoadBundleOperation.cs

@@ -5,21 +5,22 @@ namespace YooAsset
 {
     internal class DCFSLoadAssetBundleOperation : FSLoadBundleOperation
     {
-        private enum ESteps
+        protected enum ESteps
         {
             None,
+            CheckExist,
             DownloadFile,
             LoadAssetBundle,
             CheckResult,
             Done,
         }
 
-        private readonly DefaultCacheFileSystem _fileSystem;
-        private readonly PackageBundle _bundle;
-        private FSDownloadFileOperation _downloadFileOp;
-        private AssetBundleCreateRequest _createRequest;
-        private bool _isWaitForAsyncComplete = false;
-        private ESteps _steps = ESteps.None;
+        protected readonly DefaultCacheFileSystem _fileSystem;
+        protected readonly PackageBundle _bundle;
+        protected FSDownloadFileOperation _downloadFileOp;
+        protected AssetBundleCreateRequest _createRequest;
+        protected bool _isWaitForAsyncComplete = false;
+        protected ESteps _steps = ESteps.None;
 
 
         internal DCFSLoadAssetBundleOperation(DefaultCacheFileSystem fileSystem, PackageBundle bundle)
@@ -29,29 +30,33 @@ namespace YooAsset
         }
         internal override void InternalOnStart()
         {
-            if (_fileSystem.NeedDownload(_bundle))
-            {                
-                _steps = ESteps.DownloadFile;
-            }
-            else
-            {
-                DownloadProgress = 1f;
-                DownloadedBytes = _bundle.FileSize;
-                _steps = ESteps.LoadAssetBundle;
-            }
+            _steps = ESteps.CheckExist;
         }
         internal override void InternalOnUpdate()
         {
             if (_steps == ESteps.None || _steps == ESteps.Done)
                 return;
 
+            if (_steps == ESteps.CheckExist)
+            {
+                if (_fileSystem.Exists(_bundle))
+                {
+                    DownloadProgress = 1f;
+                    DownloadedBytes = _bundle.FileSize;
+                    _steps = ESteps.LoadAssetBundle;
+                }
+                else
+                {
+                    _steps = ESteps.DownloadFile;
+                }
+            }
+
             if (_steps == ESteps.DownloadFile)
             {
                 if (_downloadFileOp == null)
                 {
-                    int failedTryAgain = int.MaxValue;
-                    int timeout = 60;
-                    _downloadFileOp = _fileSystem.DownloadFileAsync(_bundle, null, failedTryAgain, timeout);
+                    DownloadParam downloadParam = new DownloadParam(int.MaxValue, 60);
+                    _downloadFileOp = _fileSystem.DownloadFileAsync(_bundle, downloadParam);
                 }
 
                 DownloadProgress = _downloadFileOp.DownloadProgress;
@@ -67,7 +72,7 @@ namespace YooAsset
                 {
                     _steps = ESteps.Done;
                     Status = EOperationStatus.Failed;
-                    Error = _downloadFileOp.Error;                   
+                    Error = _downloadFileOp.Error;
                 }
             }
 
@@ -106,14 +111,14 @@ namespace YooAsset
                 if (Result != null)
                 {
                     _steps = ESteps.Done;
-                    Status = EOperationStatus.Succeed;                  
+                    Status = EOperationStatus.Succeed;
                 }
                 else
                 {
                     // 注意：当缓存文件的校验等级为Low的时候，并不能保证缓存文件的完整性。
                     // 说明：在AssetBundle文件加载失败的情况下，我们需要重新验证文件的完整性！
-                    EFileVerifyResult result = _fileSystem.VerifyCacheFile(_bundle);
-                    if (result == EFileVerifyResult.Succeed)
+                    EFileVerifyResult verifyResult = _fileSystem.VerifyCacheFile(_bundle);
+                    if (verifyResult == EFileVerifyResult.Succeed)
                     {
                         // 注意：在安卓移动平台，华为和三星真机上有极小概率加载资源包失败。
                         // 说明：大多数情况在首次安装下载资源到沙盒内，游戏过程中切换到后台再回到游戏内有很大概率触发！
@@ -126,20 +131,20 @@ namespace YooAsset
                             {
                                 _steps = ESteps.Done;
                                 Status = EOperationStatus.Failed;
-                                Error = $"Failed to load assetBundle from memory : {_bundle.BundleName}";                          
+                                Error = $"Failed to load assetBundle from memory : {_bundle.BundleName}";
                                 YooLogger.Error(Error);
                             }
                             else
                             {
                                 _steps = ESteps.Done;
-                                Status = EOperationStatus.Succeed;                             
+                                Status = EOperationStatus.Succeed;
                             }
                         }
                         else
                         {
                             _steps = ESteps.Done;
                             Status = EOperationStatus.Failed;
-                            Error = $"Failed to read assetBundle file bytes : {_bundle.BundleName}";                   
+                            Error = $"Failed to read assetBundle file bytes : {_bundle.BundleName}";
                             YooLogger.Error(Error);
                         }
                     }
@@ -148,7 +153,7 @@ namespace YooAsset
                         _steps = ESteps.Done;
                         _fileSystem.DeleteCacheFile(_bundle.BundleGUID);
                         Status = EOperationStatus.Failed;
-                        Error = $"Find corrupted file and delete the file : {_bundle.BundleName}";                  
+                        Error = $"Find corrupted file and delete the file : {_bundle.BundleName}";
                         YooLogger.Error(Error);
                     }
                 }
@@ -193,19 +198,20 @@ namespace YooAsset
 
     internal class DCFSLoadRawBundleOperation : FSLoadBundleOperation
     {
-        private enum ESteps
+        protected enum ESteps
         {
             None,
+            CheckExist,
             DownloadFile,
             LoadRawBundle,
             CheckResult,
             Done,
         }
 
-        private readonly DefaultCacheFileSystem _fileSystem;
-        private readonly PackageBundle _bundle;
-        private FSDownloadFileOperation _downloadFileOp;
-        private ESteps _steps = ESteps.None;
+        protected readonly DefaultCacheFileSystem _fileSystem;
+        protected readonly PackageBundle _bundle;
+        protected FSDownloadFileOperation _downloadFileOp;
+        protected ESteps _steps = ESteps.None;
 
 
         internal DCFSLoadRawBundleOperation(DefaultCacheFileSystem fileSystem, PackageBundle bundle)
@@ -215,29 +221,33 @@ namespace YooAsset
         }
         internal override void InternalOnStart()
         {
-            if (_fileSystem.NeedDownload(_bundle))
-            {
-                _steps = ESteps.DownloadFile;
-            }
-            else
-            {
-                DownloadProgress = 1f;
-                DownloadedBytes = _bundle.FileSize;
-                _steps = ESteps.LoadRawBundle;
-            }
+            _steps = ESteps.CheckExist;
         }
         internal override void InternalOnUpdate()
         {
             if (_steps == ESteps.None || _steps == ESteps.Done)
                 return;
 
+            if (_steps == ESteps.CheckExist)
+            {
+                if (_fileSystem.Exists(_bundle))
+                {
+                    DownloadProgress = 1f;
+                    DownloadedBytes = _bundle.FileSize;
+                    _steps = ESteps.LoadRawBundle;
+                }
+                else
+                {
+                    _steps = ESteps.DownloadFile;
+                }
+            }
+
             if (_steps == ESteps.DownloadFile)
             {
                 if (_downloadFileOp == null)
                 {
-                    int failedTryAgain = int.MaxValue;
-                    int timeout = 60;
-                    _downloadFileOp = _fileSystem.DownloadFileAsync(_bundle, null, failedTryAgain, timeout);
+                    DownloadParam downloadParam = new DownloadParam(int.MaxValue, 60);
+                    _downloadFileOp = _fileSystem.DownloadFileAsync(_bundle, downloadParam);
                 }
 
                 DownloadProgress = _downloadFileOp.DownloadProgress;
@@ -253,7 +263,7 @@ namespace YooAsset
                 {
                     _steps = ESteps.Done;
                     Status = EOperationStatus.Failed;
-                    Error = _downloadFileOp.Error;              
+                    Error = _downloadFileOp.Error;
                 }
             }
 
@@ -272,20 +282,20 @@ namespace YooAsset
                     if (File.Exists(filePath))
                     {
                         _steps = ESteps.Done;
-                        Status = EOperationStatus.Succeed;                      
+                        Status = EOperationStatus.Succeed;
                     }
                     else
                     {
                         _steps = ESteps.Done;
                         Status = EOperationStatus.Failed;
-                        Error = $"Can not found raw bundle file : {filePath}";                       
+                        Error = $"Can not found cache raw bundle file : {filePath}";
                     }
                 }
                 else
                 {
                     _steps = ESteps.Done;
                     Status = EOperationStatus.Failed;
-                    Error = $"Failed load raw bundle file : {_bundle.BundleName}";                
+                    Error = $"Failed to load cache raw bundle file : {_bundle.BundleName}";
                 }
             }
         }

Assets/YooAsset/Runtime/FileSystem/DefaultCacheFileSystem/Operation/DCFSLoadPackageManifestOperation.cs

@@ -125,7 +125,7 @@ namespace YooAsset
                 if (_loadCachePackageManifestOp.Status == EOperationStatus.Succeed)
                 {
                     _steps = ESteps.Done;
-                    Result = _loadCachePackageManifestOp.Manifest;
+                    Manifest = _loadCachePackageManifestOp.Manifest;
                     Status = EOperationStatus.Succeed;
                 }
                 else
@@ -144,7 +144,6 @@ namespace YooAsset
             string manifestFilePath = _fileSystem.GetCachePackageManifestFilePath(_packageVersion);
             if (File.Exists(manifestFilePath))
             {
-                YooLogger.Warning($"Failed to load cache manifest file : {Error}");
                 YooLogger.Warning($"Invalid cache manifest file have been removed : {manifestFilePath}");
                 File.Delete(manifestFilePath);
             }

Assets/YooAsset/Runtime/FileSystem/DefaultCacheFileSystem/Operation/DCFSRequestPackageVersionOperation.cs

@@ -13,7 +13,7 @@ namespace YooAsset
         private readonly DefaultCacheFileSystem _fileSystem;
         private readonly bool _appendTimeTicks;
         private readonly int _timeout;
-        private DefaultGetRemotePackageVersionOperation _getRemotePackageVersionOp;
+        private RequestRemotePackageVersionOperation _requestRemotePackageVersionOp;
         private ESteps _steps = ESteps.None;
 
 
@@ -34,31 +34,27 @@ namespace YooAsset
 
             if (_steps == ESteps.GetPackageVersion)
             {
-                if (_getRemotePackageVersionOp == null)
+                if (_requestRemotePackageVersionOp == null)
                 {
-                    string packageName = _fileSystem.PackageName;
-                    string fileName = YooAssetSettingsData.GetPackageVersionFileName(packageName);
-                    string mainURL = _fileSystem.RemoteServices.GetRemoteMainURL(fileName);
-                    string fallbackURL = _fileSystem.RemoteServices.GetRemoteFallbackURL(fileName);
-                    _getRemotePackageVersionOp = new DefaultGetRemotePackageVersionOperation(packageName, mainURL, fallbackURL, _appendTimeTicks, _timeout);
-                    OperationSystem.StartOperation(packageName, _getRemotePackageVersionOp);
+                    _requestRemotePackageVersionOp = new RequestRemotePackageVersionOperation(_fileSystem, _appendTimeTicks, _timeout);
+                    OperationSystem.StartOperation(_fileSystem.PackageName, _requestRemotePackageVersionOp);
                 }
 
-                Progress = _getRemotePackageVersionOp.Progress;
-                if (_getRemotePackageVersionOp.IsDone == false)
+                Progress = _requestRemotePackageVersionOp.Progress;
+                if (_requestRemotePackageVersionOp.IsDone == false)
                     return;
 
-                if (_getRemotePackageVersionOp.Status == EOperationStatus.Succeed)
+                if (_requestRemotePackageVersionOp.Status == EOperationStatus.Succeed)
                 {
                     _steps = ESteps.Done;
-                    PackageVersion = _getRemotePackageVersionOp.PackageVersion;
+                    PackageVersion = _requestRemotePackageVersionOp.PackageVersion;
                     Status = EOperationStatus.Succeed;
                 }
                 else
                 {
                     _steps = ESteps.Done;
                     Status = EOperationStatus.Failed;
-                    Error = _getRemotePackageVersionOp.Error;
+                    Error = _requestRemotePackageVersionOp.Error;
                 }
             }
         }

Assets/YooAsset/Runtime/FileSystem/DefaultCacheFileSystem/Operation/internal/DownloadPackageHashOperation.cs

@@ -57,7 +57,6 @@ namespace YooAsset
                     string savePath = _fileSystem.GetCachePackageHashFilePath(_packageVersion);
                     string fileName = YooAssetSettingsData.GetPackageHashFileName(_fileSystem.PackageName, _packageVersion);
                     string webURL = GetWebRequestURL(fileName);
-                    YooLogger.Log($"Beginning to download package hash file : {webURL}");
                     _webFileRequestOp = new UnityWebFileRequestOperation(webURL, savePath, _timeout);
                     OperationSystem.StartOperation(_fileSystem.PackageName, _webFileRequestOp);
                 }

Assets/YooAsset/Runtime/FileSystem/DefaultCacheFileSystem/Operation/internal/DownloadPackageManifestOperation.cs

@@ -57,7 +57,6 @@ namespace YooAsset
                     string savePath = _fileSystem.GetCachePackageManifestFilePath(_packageVersion);
                     string fileName = YooAssetSettingsData.GetManifestBinaryFileName(_fileSystem.PackageName, _packageVersion);
                     string webURL = GetDownloadRequestURL(fileName);
-                    YooLogger.Log($"Beginning to download package manifest file : {webURL}");
                     _webFileRequestOp = new UnityWebFileRequestOperation(webURL, savePath, _timeout);
                     OperationSystem.StartOperation(_fileSystem.PackageName, _webFileRequestOp);
                 }

Assets/YooAsset/Runtime/FileSystem/DefaultCacheFileSystem/Operation/internal/LoadCachePackageHashOperation.cs

@@ -42,7 +42,7 @@ namespace YooAsset
                 {
                     _steps = ESteps.Done;
                     Status = EOperationStatus.Failed;
-                    Error = $"Cache package hash file not found : {filePath}";
+                    Error = $"Can not found cache package hash file : {filePath}";
                     return;
                 }
 

Assets/YooAsset/Runtime/FileSystem/DefaultCacheFileSystem/Operation/internal/LoadCachePackageManifestOperation.cs

@@ -21,7 +21,7 @@ namespace YooAsset
         private ESteps _steps = ESteps.None;
 
         /// <summary>
-        /// 加载的清单实例
+        /// 包裹清单
         /// </summary>
         public PackageManifest Manifest { private set; get; }
 
@@ -53,7 +53,7 @@ namespace YooAsset
                 {
                     _steps = ESteps.Done;
                     Status = EOperationStatus.Failed;
-                    Error = $"Cache manifest file not found : {manifestFilePath}";
+                    Error = $"Can not found cache manifest file : {manifestFilePath}";
                 }
             }
 

Assets/YooAsset/Runtime/FileSystem/DefaultCacheFileSystem/Operation/internal/RequestRemotePackageVersionOperation.cs

@@ -0,0 +1,98 @@
+
+namespace YooAsset
+{
+    internal class RequestRemotePackageVersionOperation : AsyncOperationBase
+    {
+        private enum ESteps
+        {
+            None,
+            RequestPackageVersion,
+            Done,
+        }
+
+        private readonly DefaultCacheFileSystem _fileSystem;
+        private readonly bool _appendTimeTicks;
+        private readonly int _timeout;
+        private UnityWebTextRequestOperation _webTextRequestOp;
+        private int _requestCount = 0;
+        private ESteps _steps = ESteps.None;
+
+        /// <summary>
+        /// 包裹版本
+        /// </summary>
+        internal string PackageVersion { set; get; }
+
+
+        internal RequestRemotePackageVersionOperation(DefaultCacheFileSystem fileSystem, bool appendTimeTicks, int timeout)
+        {
+            _fileSystem = fileSystem;
+            _appendTimeTicks = appendTimeTicks;
+            _timeout = timeout;
+        }
+        internal override void InternalOnStart()
+        {
+            _requestCount = WebRequestCounter.GetRequestFailedCount(_fileSystem.PackageName, nameof(RequestRemotePackageVersionOperation));
+            _steps = ESteps.RequestPackageVersion;
+        }
+        internal override void InternalOnUpdate()
+        {
+            if (_steps == ESteps.None || _steps == ESteps.Done)
+                return;
+
+            if (_steps == ESteps.RequestPackageVersion)
+            {
+                if (_webTextRequestOp == null)
+                {
+                    string fileName = YooAssetSettingsData.GetPackageVersionFileName(_fileSystem.PackageName);
+                    string url = GetWebRequestURL(fileName);
+                    _webTextRequestOp = new UnityWebTextRequestOperation(url, _timeout);
+                    OperationSystem.StartOperation(_fileSystem.PackageName, _webTextRequestOp);
+                }
+
+                Progress = _webTextRequestOp.Progress;
+                if (_webTextRequestOp.IsDone == false)
+                    return;
+
+                if (_webTextRequestOp.Status == EOperationStatus.Succeed)
+                {
+                    PackageVersion = _webTextRequestOp.Result;
+                    if (string.IsNullOrEmpty(PackageVersion))
+                    {
+                        _steps = ESteps.Done;
+                        Status = EOperationStatus.Failed;
+                        Error = $"Remote package version file content is empty !";
+                    }
+                    else
+                    {
+                        _steps = ESteps.Done;
+                        Status = EOperationStatus.Succeed;
+                    }
+                }
+                else
+                {
+                    _steps = ESteps.Done;
+                    Status = EOperationStatus.Failed;
+                    Error = _webTextRequestOp.Error;
+                    WebRequestCounter.RecordRequestFailed(_fileSystem.PackageName, nameof(RequestRemotePackageVersionOperation));
+                }
+            }
+        }
+
+        private string GetWebRequestURL(string fileName)
+        {
+            string url;
+
+            // 轮流返回请求地址
+            if (_requestCount % 2 == 0)
+                url = _fileSystem.RemoteServices.GetRemoteMainURL(fileName);
+            else
+                url = _fileSystem.RemoteServices.GetRemoteFallbackURL(fileName);
+
+            // 在URL末尾添加时间戳
+            if (_appendTimeTicks)
+                return $"{url}?{System.DateTime.UtcNow.Ticks}";
+            else
+                return url;
+        }
+    }
+}

Assets/YooAsset/Runtime/FileSystem/DefaultCacheFileSystem/Operation/internal/RequestRemotePackageVersionOperation.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 1b078a220cc4f7d4392d77ccc77c001e
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/YooAsset/Runtime/FileSystem/DefaultCacheFileSystem/Operation/internal/SearchCacheFilesOperation.cs

@@ -56,7 +56,6 @@ namespace YooAsset
                 if (SearchFiles())
                     return;
 
-                // 注意：总是返回成功
                 _steps = ESteps.Done;
                 Status = EOperationStatus.Succeed;
                 float costTime = UnityEngine.Time.realtimeSinceStartup - _verifyStartTime;

Assets/YooAsset/Runtime/FileSystem/DefaultCacheFileSystem/Operation/internal/VerifyCacheFilesOperation.cs

@@ -35,7 +35,7 @@ namespace YooAsset
             }
             catch (System.Exception e)
             {
-                YooLogger.Warning($"Failed delete cache bundle folder : {e}");
+                YooLogger.Warning($"Failed to delete cache bundle folder : {e}");
             }
         }
     }
@@ -165,7 +165,7 @@ namespace YooAsset
             {
                 _failedCount++;
 
-                YooLogger.Warning($"Failed verify file {element.Result} and delete files : {element.FileRootPath}");
+                YooLogger.Warning($"Failed to verify file {element.Result} and delete files : {element.FileRootPath}");
                 element.DeleteFiles();
             }
         }

Assets/YooAsset/Runtime/FileSystem/DefaultCacheFileSystem/Operation/internal/VerifyTempFileOperation.cs

@@ -81,7 +81,7 @@ namespace YooAsset
                 {
                     _steps = ESteps.Done;
                     Status = EOperationStatus.Failed;
-                    Error = $"Failed verify file : {_element.TempFilePath} ! ErrorCode : {VerifyResult}";
+                    Error = $"Failed to verify file : {_element.TempFilePath} ! ErrorCode : {VerifyResult}";
                 }
             }
         }