// 2017/6/16
void m_loader_Prompt(object sender, MessagePromptEventArgs e)
{
MessagePromptEventHandler handler = this.Prompt;
if (handler != null)
{
handler(sender, e);
}
}
// static CancellationToken _token;
// 探测 MD5 (用轮询任务法)
// return:
// -1 出错
// 0 文件没有找到
// 1 文件找到
public static int GetServerFileMD5ByTask(
LibraryChannel channel,
Stop stop,
string strServerPath,
MessagePromptEventHandler prompt,
CancellationToken token,
out byte[] md5,
out string strError)
{
strError = "";
md5 = null;
// 对于 dp2Kernel 内的资源只能用以前的非 Task 方式
if (strServerPath.StartsWith("!") == false)
{
return(GetServerFileMD5_old(
channel,
stop,
strServerPath,
out md5,
out strError));
}
/*
* string strStyle = "md5";
* string strMetadata = "";
* byte[] baContent = null;
* string strOutputPath = "";
*/
TimeSpan old_timeout = channel.Timeout;
channel.Timeout = TimeSpan.FromSeconds(10);
try
{
// 检查 dp2library 版本号
REDO_GETVERSION:
long lRet = channel.GetVersion(stop,
out string version,
out string uid,
out strError);
if (lRet == -1)
{
if (prompt != null &&
!(stop != null && stop.IsStopped == true))
{
MessagePromptEventArgs e = new MessagePromptEventArgs();
e.MessageText = $"获得 dp2library 服务器 {channel.Url} 版本号时发生错误: {strError}";
e.Actions = "yes,no,cancel";
prompt(null, e);
if (e.ResultAction == "yes")
{
goto REDO_GETVERSION;
}
}
strError = "检查 dp2library 服务器版本号时出错: " + strError;
return(-1);
}
string base_version = "3.23";
if (StringUtil.CompareVersion(version, base_version) < 0)
{
// strError = "获得服务器文件 MD5 的功能需要 dp2library 服务器版本为 {base_version} 以上";
// return -1;
// 改用旧功能
return(GetServerFileMD5_old(
channel,
stop,
strServerPath,
out md5,
out strError));
}
// TODO: 如果此请求出现通讯错误，再次重试请求的时候记得 removeTask 前一次的 task
// 启动任务
// return:
// strStyle 一般设置为"content,data,metadata,timestamp,outputpath";
// -1 出错。具体出错原因在this.ErrorCode中。this.ErrorInfo中有出错信息。
// 0 成功
lRet = channel.GetRes(
stop,
strServerPath,
0,
0,
"md5,beginTask",
out byte[] baContent,
out string strMetadata,
out string strOutputPath,
out md5,
out strError);
if (lRet == -1)
{
if (channel.ErrorCode == localhost.ErrorCode.NotFound)
{
return(0);
}
// TODO: 遇到通讯出错，需要重试操作
return(-1);
}
string taskID = Encoding.UTF8.GetString(md5);
// 轮询，获得任务结果
while (true)
{
if (token.IsCancellationRequested)
{
strError = "前端请求中断";
return(-1);
}
if (stop != null && stop.IsStopped)
{
strError = "前端请求中断";
return(-1);
}
REDO_CHECKTASK:
lRet = channel.GetRes(
stop,
strServerPath,
0,
0,
$"md5,getTaskResult,taskID:{taskID}",
out baContent,
out strMetadata,
out strOutputPath,
out md5,
out strError);
// TODO: 如果遇到通讯出错，需要重试操作
if (lRet == -1)
{
if (prompt != null &&
!(stop != null && stop.IsStopped == true))
{
MessagePromptEventArgs e = new MessagePromptEventArgs();
e.MessageText = $"检查文件 {strServerPath} MD5 任务状态时发生错误: {strError}";
e.Actions = "yes,no,cancel";
prompt(null, e);
if (e.ResultAction == "yes")
{
goto REDO_CHECKTASK;
}
}
return(-1);
}
if (lRet == 1)
{
return(1);
}
Task.Delay(TimeSpan.FromSeconds(1), token).Wait();
}
}
catch (Exception ex)
{
strError = "GetServerFileMD5ByTask() 出现异常: " + ex.Message;
return(-1);
}
finally
{
channel.Timeout = old_timeout;
}
}
