async public Task <bool> DownloadAsync()
{
var ts = DateTime.Now - this.lastCheckTime;
if (ts.TotalSeconds < this.intervalSeconds)
{
return(false);
}
bool isChanged = false;
string oldMD5 = this.MD5;
this.checkCounter++;
this.lastCheckTime = DateTime.Now;
Stopwatch sw = Stopwatch.StartNew();
Exception error = null;
using (var httpClient = new HttpClient())
{
try
{
HttpResponseMessage respone = await httpClient.GetAsync(DownloadUri);
respone.EnsureSuccessStatusCode();
HttpContent httpContent = respone.Content;
HttpContentHeaders contentHeaders = httpContent.Headers;
HttpResponseHeaders responseHeaders = respone.Headers;
if (this.contentLength != contentHeaders.ContentLength)
{
isChanged = true;
}
else if (contentLastModified != ToDateTime(contentHeaders.LastModified))
{
isChanged = true;
}
this.contentLength = contentHeaders.ContentLength;
this.contentLastModified = ToDateTime(contentHeaders.LastModified);
this.contentType = contentHeaders.ContentType;
using (MemoryStream ms = new MemoryStream())
{
if (IsNeedCheckMD5)
{
await httpContent.CopyToAsync(ms);
string newMD5 = MD5Code.StreamMD5(ms);
if (this.md5 != newMD5)
{
this.md5 = newMD5;
isChanged = true;
}
}//IsNeedCheckMD5
if (isChanged)
{
this.lastChangeTime = DateTime.Now;
changeCounter++;
if (ms.Length > 0) //已经下载过
{
if (IsNeedCheck_PT_SS)
{
this.pt_ss = Search_PT_SS(ms);
/**
* if (this.pt_ss != ptss)
* {
*
* this.pt_ss = ptss;
* }
* **/
}//IsNeedCheck_PT_SS
ms.Position = 0;
using (FileStream fs = File.Create(tempFileName))
{
ms.Position = 0;
ms.WriteTo(fs);
}
} //(ms.Length > 0)
else //
{
using (FileStream fs = File.Create(tempFileName))
{
await httpContent.CopyToAsync(fs);
}
//long len = await transfer.DownloadAsync(new Uri(this.Uri), this.SaveFileName, httpClient);
}
}//(isChanged)
errorCounter = 0;
}// using (MemoryStream ms
}
catch (Exception ex)
{
error = ex;
errorCounter++;
if (errorCounter > 20)
{
errorCounter = 20;
}
errorMsg = ex.Message;
this.lastCheckTime = DateTime.Now.AddSeconds(errorCounter * 60); //推迟下次请求时间
//loger.Error(System.Reflection.MethodBase.GetCurrentMethod().Name, ex);
}
//NotifyResult(transfer, downloadNotify, isChanged, error); //update by hua
//this.NotifyResultAsync(transfer, downloadNotify, isChanged, error);
if (isChanged)
{
foreach (var dsf in SaveFiles.Values)
{
await dsf.FromAsync(this.tempFileName);
}
}
sw.Stop();
this.procDuration = (long)sw.Elapsed.TotalMilliseconds;
return(isChanged);
}//using httpclient
}
