private IEnumerator Download()
{
// 注意：开发者需要在下载前检测磁盘空间不足
// 计算下载文件的总大小
int totalDownloadCount = _patcher.DownloadList.Count;
long totalDownloadSizeBytes = 0;
foreach (var element in _patcher.DownloadList)
{
totalDownloadSizeBytes += element.SizeBytes;
}
// 开始下载列表里的所有资源
MotionLog.Log($"Begine download web files : {_patcher.DownloadList.Count}");
long currentDownloadSizeBytes = 0;
int currentDownloadCount = 0;
foreach (var element in _patcher.DownloadList)
{
// 注意：资源版本号只用于确定下载路径
string url = _patcher.GetWebDownloadURL(element.Version.ToString(), element.Name);
string savePath = AssetPathHelper.MakePersistentLoadPath(element.Name);
element.SavePath = savePath;
FileUtility.CreateFileDirectory(savePath);
// 创建下载器
WebFileRequest download = new WebFileRequest(url, savePath);
yield return(download.DownLoad()); //文件依次加载（在一个文件加载完毕后加载下一个）
MotionLog.Log($"Web file is download : {savePath}");
// 检测是否下载失败
if (download.States != EWebRequestStates.Success)
{
PatchEventDispatcher.SendWebFileDownloadFailedMsg(url, element.Name);
yield break;
}
// 立即释放加载器
download.Dispose();
currentDownloadCount++;
currentDownloadSizeBytes += element.SizeBytes;
PatchEventDispatcher.SendDownloadFilesProgressMsg(totalDownloadCount, currentDownloadCount, totalDownloadSizeBytes, currentDownloadSizeBytes);
}
// 验证下载文件的大小
if (_patcher.CheckLevel == ECheckLevel.CheckSize)
{
foreach (var element in _patcher.DownloadList)
{
long fileSize = FileUtility.GetFileSize(element.SavePath);
if (fileSize != element.SizeBytes)
{
MotionLog.Error($"Web file size check failed : {element.Name}");
PatchEventDispatcher.SendWebFileCheckFailedMsg(element.Name);
yield break;
}
}
}
// 验证下载文件的MD5
if (_patcher.CheckLevel == ECheckLevel.CheckMD5)
{
foreach (var element in _patcher.DownloadList)
{
string md5 = HashUtility.FileMD5(element.SavePath);
if (md5 != element.MD5)
{
MotionLog.Error($"Web file md5 check failed : {element.Name}");
PatchEventDispatcher.SendWebFileCheckFailedMsg(element.Name);
yield break;
}
}
}
// 最后保存最新的补丁清单
_patcher.SaveWebPatchManifest();
_patcher.ClearWebPatchManifestCacheData();
// 最后清空下载列表
_patcher.DownloadList.Clear();
_patcher.SwitchNext();
}