Init TEngine4.0.0

Init TEngine4.0.0

UnityProject/Packages/YooAsset/Runtime/DownloadSystem/Downloader/FileGeneralDownloader.cs

@@ -0,0 +1,229 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.IO;
+using UnityEngine;
+using UnityEngine.Networking;
+
+namespace YooAsset
+{
+	/// <summary>
+	/// 普通的下载器
+	/// </summary>
+	internal sealed class FileGeneralDownloader : DownloaderBase
+	{
+		private enum ESteps
+		{
+			None,
+			PrepareDownload,
+			CreateDownloader,
+			CheckDownload,
+			VerifyTempFile,
+			WaitingVerifyTempFile,
+			CachingFile,
+			TryAgain,
+			Done,
+		}
+
+		private readonly string _tempFilePath;
+		private VerifyTempFileOperation _verifyFileOp = null;
+		private ESteps _steps = ESteps.None;
+
+
+		public FileGeneralDownloader(BundleInfo bundleInfo, int failedTryAgain, int timeout) : base(bundleInfo, failedTryAgain, timeout)
+		{
+			_tempFilePath = bundleInfo.Bundle.TempDataFilePath;
+		}
+		public override void SendRequest(params object[] param)
+		{
+			if (_steps == ESteps.None)
+			{
+				_steps = ESteps.PrepareDownload;
+			}
+		}
+		public override void Update()
+		{
+			if (_steps == ESteps.None)
+				return;
+			if (IsDone())
+				return;
+
+			// 准备下载
+			if (_steps == ESteps.PrepareDownload)
+			{
+				// 获取请求地址
+				_requestURL = GetRequestURL();
+
+				// 重置变量
+				_downloadProgress = 0f;
+				_downloadedBytes = 0;
+
+				// 重置变量
+				_isAbort = false;
+				_latestDownloadBytes = 0;
+				_latestDownloadRealtime = Time.realtimeSinceStartup;
+
+				// 重置计时器
+				if(_tryAgainTimer > 0f)
+					YooLogger.Warning($"Try again download : {_requestURL}");
+				_tryAgainTimer = 0f;
+
+				// 删除临时文件
+				if (File.Exists(_tempFilePath))
+					File.Delete(_tempFilePath);
+
+				_steps = ESteps.CreateDownloader;
+			}
+
+			// 创建下载器
+			if (_steps == ESteps.CreateDownloader)
+			{
+				_webRequest = DownloadSystem.NewRequest(_requestURL);
+				DownloadHandlerFile handler = new DownloadHandlerFile(_tempFilePath);
+				handler.removeFileOnAbort = true;
+				_webRequest.downloadHandler = handler;
+				_webRequest.disposeDownloadHandlerOnDispose = true;
+				_webRequest.SendWebRequest();
+				_steps = ESteps.CheckDownload;
+			}
+
+			// 检测下载结果
+			if (_steps == ESteps.CheckDownload)
+			{
+				_downloadProgress = _webRequest.downloadProgress;
+				_downloadedBytes = _webRequest.downloadedBytes;
+				if (_webRequest.isDone == false)
+				{
+					CheckTimeout();
+					return;
+				}
+
+				bool hasError = false;
+
+				// 检查网络错误
+#if UNITY_2020_3_OR_NEWER
+				if (_webRequest.result != UnityWebRequest.Result.Success)
+				{
+					hasError = true;
+					_lastError = _webRequest.error;
+					_lastCode = _webRequest.responseCode;
+				}
+#else
+				if (_webRequest.isNetworkError || _webRequest.isHttpError)
+				{
+					hasError = true;
+					_lastError = _webRequest.error;
+					_lastCode = _webRequest.responseCode;
+				}
+#endif
+
+				// 如果网络异常
+				if (hasError)
+				{
+					// 下载失败之后删除文件
+					if (File.Exists(_tempFilePath))
+						File.Delete(_tempFilePath);
+
+					_steps = ESteps.TryAgain;
+				}
+				else
+				{
+					_steps = ESteps.VerifyTempFile;
+				}
+
+				// 最终释放下载器
+				DisposeWebRequest();
+			}
+
+			// 验证下载文件
+			if (_steps == ESteps.VerifyTempFile)
+			{
+				VerifyTempFileElement element = new VerifyTempFileElement(_bundleInfo.Bundle.TempDataFilePath, _bundleInfo.Bundle.FileCRC, _bundleInfo.Bundle.FileSize);
+				_verifyFileOp = VerifyTempFileOperation.CreateOperation(element);
+				OperationSystem.StartOperation(_verifyFileOp);
+				_steps = ESteps.WaitingVerifyTempFile;
+			}
+
+			// 等待验证完成
+			if (_steps == ESteps.WaitingVerifyTempFile)
+			{
+				if (WaitForAsyncComplete)
+					_verifyFileOp.Update();
+
+				if (_verifyFileOp.IsDone == false)
+					return;
+
+				if (_verifyFileOp.Status == EOperationStatus.Succeed)
+				{
+					_steps = ESteps.CachingFile;
+				}
+				else
+				{
+					if (File.Exists(_tempFilePath))
+						File.Delete(_tempFilePath);
+
+					_lastError = _verifyFileOp.Error;
+					_steps = ESteps.TryAgain;
+				}
+			}
+
+			// 缓存下载文件
+			if (_steps == ESteps.CachingFile)
+			{
+				try
+				{
+					CachingFile(_tempFilePath);
+					_status = EStatus.Succeed;
+					_steps = ESteps.Done;
+					_lastError = string.Empty;
+					_lastCode = 0;
+				}
+				catch (Exception e)
+				{
+					_lastError = e.Message;
+					_steps = ESteps.TryAgain;
+				}
+			}
+
+			// 重新尝试下载
+			if (_steps == ESteps.TryAgain)
+			{
+				if (_failedTryAgain <= 0)
+				{
+					ReportError();
+					_status = EStatus.Failed;
+					_steps = ESteps.Done;
+					return;
+				}
+
+				_tryAgainTimer += Time.unscaledDeltaTime;
+				if (_tryAgainTimer > 1f)
+				{
+					_failedTryAgain--;
+					_steps = ESteps.PrepareDownload;
+					ReportWarning();
+				}
+			}
+		}
+		public override void Abort()
+		{
+			if (IsDone() == false)
+			{
+				_status = EStatus.Failed;
+				_steps = ESteps.Done;
+				_lastError = "user abort";
+				_lastCode = 0;
+				DisposeWebRequest();
+			}
+		}
+
+		private void DisposeWebRequest()
+		{
+			if (_webRequest != null)
+			{
+				_webRequest.Dispose();
+				_webRequest = null;
+			}
+		}
+	}
+}