private async void StartDownLoad()
{
Log.Debug("UpdateTask.StartDownLoad():当前执行线程id=" + Thread.CurrentThread.ManagedThreadId);
int isDone = 0;
Interlocked.Exchange(ref isDone, 0);
Exception lastException = null;
//下载ConfigXML(异步的)
Http.Get(setting.xmlUrl).OnSuccess((WebHeaderCollection collection, Stream stream) =>
{
try
{
var xml = XmlHelper.CreatXml();
if (setting.xmlUrl.EndsWith(".zip"))
{
MemoryStream ms = new MemoryStream();
CopyStream(stream, ms);
MemoryStream xmlms = new MemoryStream();
ms.Position = 0;
ZipFile zip = ZipFile.Read(ms);
ZipEntry ze = zip.Entries.First();//第一个实体
ze.Extract(xmlms);
xmlms.Position = 0;
xml.Load(xmlms); //从下载文件流中读xml
}
else
{
xml.Load(stream); //从下载文件流中读xml
}
Log.Info("UpdateTask.StartDownLoad():下载xml成功!");
originFolder = new OriginFolder();
var node = xml.DocumentElement.SelectSingleNode("./" + typeof(OriginFolder).Name);
originFolder.FromXml(node);//从xml文件根节点反序列化
//使用服务器上下载下来的来初始化客户端的
localFolder.InitWithFolderConfig(originFolder.fileItemDict);
//检查本地哪些文件需要下载
localFolder.CheekNeedDownload();
Interlocked.Increment(ref isDone);//标记为1，下载xml完成
}
catch (Exception e)
{
Log.Error($"UpdateTask.StartDownLoad():下载xml异常,{setting.xmlUrl} - " + e.Message);
lastException = e; //记录异常信息
Interlocked.Decrement(ref isDone); //也标记它非零了, -1
}
}).OnFail((e) =>
{
Log.Warning($"UpdateTask.StartDownLoad():OnFail()下载xml失败,{setting.xmlUrl} - " + e.Message);
lastException = e; //记录异常信息
Interlocked.Decrement(ref isDone); //也标记它非零了, -1
}).Go();
//一直卡在这里等待上面的方法执行完成
while (true)
{
Log.Debug("UpdateTask.StartDownLoad():await Task.Delay(1)之前 当前执行线程id=" + Thread.CurrentThread.ManagedThreadId);
await Task.Delay(1);
//await WaitDelay();//这里使用Task.Delay和这个函数都会导致线程改变
Log.Debug("UpdateTask.StartDownLoad():await Task.Delay(1)之后 当前执行线程id=" + Thread.CurrentThread.ManagedThreadId);
if (isDone > 0)
{
break;
}
if (isDone < 0)
{
try { EventError?.Invoke(lastException); }
catch (Exception ex) { Log.Warning("UpdateTask.StartDownLoad():执行用户事件EventError异常:" + ex.Message); }
return;//这里下载xml失败了，那这个函数不需要往下走了
}
}
int errorCount = 0;
while (errorCount < 5)//只重试5次
{
//遍历每一项下载
foreach (var kvp in localFolder.fileItemClientDict)
{
await DownLoadOneFile(kvp.Value);
}
if (CheckTempFileCorrect())//如果确定已经下载ok了
{
break;
}
errorCount++;
}
//重试超过五次是下载失败
if (errorCount >= 5)
{
Log.Warning($"UpdateTask.StartDownLoad():下载文件失败,重试超过5次!");
try { EventError?.Invoke(new Exception(setting.xmlUrl)); }
catch (Exception ex) { Log.Warning("UpdateTask.StartDownLoad():执行用户事件EventError异常:" + ex.Message); }
return;
}
//执行下载完成事件
if (EventDownloadSuccess != null)
{
try { EventDownloadSuccess(this); }
catch (Exception e)
{
Log.Error("UpdateTask.StartProc():执行用户事件EventDownloadSuccess异常:" + e.Message);
}
}
}
