private static DownloadFileTask ExecuteFileActionIfAvailable(DownloadFileTask task)
{
if (task.DownloadState.IsNewVersionAvailable && task.PostdownloadAction != null)
{
_logger.Info($"[{Path.GetFileName(task.DownloadState.Url.LocalPath)}] Action found. Triggering...");
task.PostdownloadAction.Trigger(task.DownloadState.DownloadPath);
_logger.Info($"[{Path.GetFileName(task.DownloadState.Url.LocalPath)}] Action finished.");
}
return(task);
}
static DownloadFileTask DownloadIfAvailable(DownloadFileTask task)
{
try {
if (task.DownloadState.IsNewVersionAvailable)
{
_logger.Info($"[{Path.GetFileName(task.DownloadState.Url.LocalPath)}] Update found. Downloading...");
var downloadRequest = WebRequest.CreateDefault(task.DownloadState.Url);
downloadRequest.Method = WebRequestMethods.Http.Get;
using (WebResponse downloadResponse = downloadRequest.GetResponse()) {
task.DownloadState.DownloadPath = GetTargetFilePath(downloadRequest.RequestUri);
if (File.Exists(task.DownloadState.DownloadPath))
{
File.Delete(task.DownloadState.DownloadPath);
}
using (WebResponse downloadingResponse = downloadRequest.GetResponse())
using (Stream downloadStream = downloadingResponse.GetResponseStream())
using (var fileStream = new FileStream(task.DownloadState.DownloadPath, FileMode.CreateNew, FileAccess.Write, FileShare.None, bufferSize: /*1 Mb*/ 1024 * 1024)) {
int totalReadBytes = 0;
while (true)
{
var readBuffer = new byte[4096];
int readBytes = downloadStream.Read(readBuffer, 0, readBuffer.Length);
if (readBytes == 0)
{
break;
}
fileStream.Write(readBuffer, 0, readBytes);
totalReadBytes += readBytes;
}
fileStream.Flush();
}
}
_logger.Info($"[{Path.GetFileName(task.DownloadState.Url.LocalPath)}] File downloaded.");
}
else
{
_logger.Info($"[{Path.GetFileName(task.DownloadState.Url.LocalPath)}] No updates.");
}
} catch (Exception ex) {
_logger.Error(ex, $"[{Path.GetFileName(task.DownloadState.Url.LocalPath)}] Downloading failed with error: {ex.Message}.");
}
return(task);
}
private static Uri ResolveUrl(DownloadFileTask task)
{
if (string.IsNullOrEmpty(task.XPath))
{
return(task.Url);
}
var webPage = new HtmlWeb();
var html = webPage.Load(task.Url);
var urlText = html.DocumentNode.SelectSingleNode(task.XPath)?.GetAttributeValue("href", null);
if (urlText == null)
{
_logger.Error($"The '{task.XPath}' XPath fetches nothing for the '{task.Url}' URL.");
return(null);
}
var url = Helper.CreateUrl(urlText);
return(url.IsAbsoluteUri
? url
: new Uri(task.Url, url));
}
