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fix: optimize large file chunk upload stability

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This commit is contained in:
SugarChes
2026-08-06 18:02:11 +08:00
parent 031fc34f12
commit 219caba818
2 changed files with 134 additions and 68 deletions
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插件库/Lskj.Util/HttpHelper.cs
+106 -54
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@@ -14,6 +14,7 @@ namespace Lskj.Util
{
private const int RequestTimeout = 120000;
private const int Tls12 = 3072;
private const int UploadChunkMaxAttempts = 3;
public enum Encode
{
@@ -101,6 +102,28 @@ namespace Lskj.Util
return builder.ToString();
}
private static bool IsTransientUploadException(WebException ex)
{
if (ex == null)
{
return false;
}
switch (ex.Status)
{
case WebExceptionStatus.ConnectFailure:
case WebExceptionStatus.ConnectionClosed:
case WebExceptionStatus.KeepAliveFailure:
case WebExceptionStatus.PipelineFailure:
case WebExceptionStatus.ReceiveFailure:
case WebExceptionStatus.SendFailure:
case WebExceptionStatus.Timeout:
return true;
default:
return false;
}
}
/// <summary>
/// post数据到指定的网址，获取cookie数据，和返回页
/// </summary>
@@ -270,70 +293,99 @@ namespace Lskj.Util
/// <returns></returns>
public static HttpWebResponse PostFileChunk(string url, byte[] fileBytes, string fileName, Dictionary<string, string> headerDic, out string result)
{
HttpWebResponse httpWebResponse = null;
try
result = "";
for (int attempt = 1; attempt <= UploadChunkMaxAttempts; attempt++)
{
string boundary = "----WebKitFormBoundary" + DateTime.Now.Ticks.ToString("x");
ConfigureTransport();
HttpWebRequest httpWebRequest = (HttpWebRequest)HttpWebRequest.Create(url);
ConfigureRequest(httpWebRequest);
httpWebRequest.Method = "POST";
httpWebRequest.Accept = Accept;
httpWebRequest.UserAgent = UserAgent;
httpWebRequest.ContentType = "multipart/form-data; boundary=" + boundary;
if (headerDic != null)
HttpWebRequest httpWebRequest = null;
HttpWebResponse httpWebResponse = null;
try
{
foreach (var item in headerDic)
string boundary = "----WebKitFormBoundary" + DateTime.Now.Ticks.ToString("x");
ConfigureTransport();
httpWebRequest = (HttpWebRequest)HttpWebRequest.Create(url);
ConfigureRequest(httpWebRequest);
// 客户网络中的代理/防火墙可能在复用连接时主动断开。
// 分片请求使用独立连接，避免 ERP 进程内其他 HTTP 请求
// 留下的连接状态影响当前上传。
httpWebRequest.KeepAlive = false;
httpWebRequest.ConnectionGroupName = "LserpUpload-"
+ Guid.NewGuid().ToString("N");
httpWebRequest.ProtocolVersion = HttpVersion.Version11;
httpWebRequest.Method = "POST";
httpWebRequest.Accept = Accept;
httpWebRequest.UserAgent = string.IsNullOrEmpty(UserAgent)
? "Lserp-Desktop/6.0"
: UserAgent;
httpWebRequest.ContentType = "multipart/form-data; boundary=" + boundary;
if (headerDic != null)
{
if (!item.Key.Equals("Content-Type"))
foreach (var item in headerDic)
{
httpWebRequest.Headers.Add(item.Key, item.Value);
if (!item.Key.Equals("Content-Type"))
{
httpWebRequest.Headers.Add(item.Key, item.Value);
}
}
}
string header =
"--" + boundary + "\r\n" +
"Content-Disposition: form-data; name=\"file\"; filename=\"" + fileName + "\"\r\n" +
"Content-Type: application/octet-stream\r\n\r\n";
string footer = "\r\n--" + boundary + "--\r\n";
byte[] headerBytes = Encoding.UTF8.GetBytes(header);
byte[] footerBytes = Encoding.UTF8.GetBytes(footer);
httpWebRequest.ContentLength = headerBytes.Length + fileBytes.Length + footerBytes.Length;
using (Stream stream = httpWebRequest.GetRequestStream())
{
stream.Write(headerBytes, 0, headerBytes.Length);
stream.Write(fileBytes, 0, fileBytes.Length);
stream.Write(footerBytes, 0, footerBytes.Length);
}
httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();
using (Stream responseStream = httpWebResponse.GetResponseStream())
using (StreamReader streamReader = new StreamReader(responseStream, Encoding.UTF8))
{
result = streamReader.ReadToEnd();
}
return httpWebResponse;
}
catch (WebException ex)
{
Console.WriteLine(ex.ToString());
string exceptionMessage = BuildWebExceptionMessage(ex);
httpWebResponse?.Close();
ex.Response?.Close();
httpWebRequest?.Abort();
string header =
"--" + boundary + "\r\n" +
"Content-Disposition: form-data; name=\"file\"; filename=\"" + fileName + "\"\r\n" +
"Content-Type: application/octet-stream\r\n\r\n";
if (attempt < UploadChunkMaxAttempts && IsTransientUploadException(ex))
{
System.Threading.Thread.Sleep(attempt * 1000);
continue;
}
string footer = "\r\n--" + boundary + "--\r\n";
byte[] headerBytes = Encoding.UTF8.GetBytes(header);
byte[] footerBytes = Encoding.UTF8.GetBytes(footer);
httpWebRequest.ContentLength = headerBytes.Length + fileBytes.Length + footerBytes.Length;
Stream stream = httpWebRequest.GetRequestStream();
stream.Write(headerBytes, 0, headerBytes.Length);
stream.Write(fileBytes, 0, fileBytes.Length);
stream.Write(footerBytes, 0, footerBytes.Length);
stream.Close();
httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();
Stream responseStream = httpWebResponse.GetResponseStream();
StreamReader streamReader = new StreamReader(responseStream, Encoding.UTF8);
result = streamReader.ReadToEnd();
streamReader.Close();
responseStream.Close();
return httpWebResponse;
}
catch (WebException ex)
{
Console.WriteLine(ex.ToString());
result = BuildWebExceptionMessage(ex);
return httpWebResponse;
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
result = BuildExceptionMessage(ex);
return httpWebResponse;
result = string.Format("{0}; Attempts={1}", exceptionMessage, attempt);
return null;
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
httpWebResponse?.Close();
httpWebRequest?.Abort();
result = BuildExceptionMessage(ex);
return null;
}
}
return null;
}
/// <summary>