private void OnHeaderRequestFinish(HttpRequester req)
{
if (req.IsError)
{
Error = req.Error;
IsFinished = true;
return;
}
using (req)
{
var lastModified = req.Response.LastModified;
// md5(savepath) to save the last modified time
var metaKey = SavePath;
_metaFilePath = Path.Combine(_pullerMetaFolderPath, Md5Helper.Md5String(metaKey));
// no handle for UTC or time zone
DateTime metaFileDateTime = DateTime.MinValue;
if (File.Exists(_metaFilePath))
{
long metaFileTicks;
var metaFileTicksStr = File.ReadAllText(_metaFilePath);
if (!long.TryParse(metaFileTicksStr, out metaFileTicks))
{
Error = new Exception("meta file ticks parse error");
IsFinished = true;
return;
}
metaFileDateTime = new DateTime(metaFileTicks);
}
_currentLastModifiedUtc = lastModified.ToUniversalTime();
HasDownloaded = _currentLastModifiedUtc != metaFileDateTime || !File.Exists(SavePath);
if (HasDownloaded)
{
// do download
_downloader = new HttpDownloader(_url, SavePath);
_downloader.SetFinishCallback(OnDownloadFinish);
_downloader.Start();
}
else
{
// no modified, ignore!
IsFinished = true;
}
}
}
protected internal override void Start()
{
// construct the url
var url = new StringBuilder();
url.Append(_urlPrefix);
if (url[url.Length - 1] != '/')
{
url.Append('/');
}
// zip file name
var fileName = string.Format("{0}.{1}-{2}{3}", _packageNamePrefix, _checkVersionHandler.LocalVersion,
_checkVersionHandler.RemoteVersion,
_packageExtension);
url.AppendFormat(fileName);
// ���̵�ַ
var savePath = Path.Combine(_downloadToPath, fileName);
_savePath = savePath;
_fullUrl = url.ToString();
_down = new HttpDownloader(_fullUrl, _savePath, true);
_down.SetRequsterAsyncHook(_requesterAsyncHook);
_down.SetFinishCallback((_) =>
{
if (_.Error != null)
{
OnError(this, string.Format("{0} : {1}", _fullUrl, _.Error.Message));
}
Finish();
});
_down.Start();
}
