/// <summary>
/// A simple constructor that initializes the object with the given values.
/// </summary>
/// <param name="p_fdrFileDownloader">The <see cref="FileDownloader"/> from which to retrieve the block this
/// downloader will download.</param>
/// <param name="p_fmdInfo">The metadata of the to be downloaded.</param>
/// <param name="p_fwrWriter">The writer to use to write the file to the disk.</param>
/// <param name="p_intBufferSize">The size of the buffer to send to the file writer.</param>
/// <param name="p_strUserAgent">The current User Agent.</param>
public BlockDownloader(FileDownloader p_fdrFileDownloader, FileMetadata p_fmdInfo, FileWriter p_fwrWriter, Int32 p_intBufferSize, string p_strUserAgent)
{
m_fdrFileDownloader = p_fdrFileDownloader;
m_fmdInfo = p_fmdInfo;
m_fwrWriter = p_fwrWriter;
m_intBufferSize = p_intBufferSize;
m_strUserAgent = p_strUserAgent;
m_fwrWriter.UnableToWrite += new EventHandler(FileWriter_UnableToWrite);
}
/// <summary>
/// Downloads the speificed file to the specified location.
/// </summary>
/// <remarks>
/// This method starts the download and returns.
///
/// If the given <paramref name="p_strSavePath"/> already exists, an attempt will be made to
/// resume the download. If the pre-existing file is not a partial download, or the download
/// cannot be resumed, the file will be overwritten.
/// </remarks>
/// <param name="p_uriURL">The URL list of the file to download.</param>
/// <param name="p_dicCookies">A list of cookies that should be sent in the request to download the file.</param>
/// <param name="p_strSavePath">The path to which to save the file.
/// If <paramref name="p_booUseDefaultFileName"/> is <c>false</c>, this value should be a complete
/// path, including filename. If <paramref name="p_booUseDefaultFileName"/> is <c>true</c>,
/// this value should be the directory in which to save the file.</param>
/// <param name="p_booUseDefaultFileName">Whether to use the file name suggested by the server.</param>
public void DownloadAsync(List<Uri> p_uriURL, Dictionary<string, string> p_dicCookies, string p_strSavePath, bool p_booUseDefaultFileName)
{
System.Diagnostics.Stopwatch swRetry = new System.Diagnostics.Stopwatch();
int retries = 1;
int i = 0;
Uri uriURL = p_uriURL[i];
ItemProgress = i;
Status = TaskStatus.Running;
while ((retries <= m_intRetries) || (Status != TaskStatus.Paused) || (Status != TaskStatus.Queued))
{
if ((Status == TaskStatus.Paused) || (Status == TaskStatus.Queued))
break;
else if (Status == TaskStatus.Retrying)
Status = TaskStatus.Running;
m_fdrDownloader = new FileDownloader(uriURL, p_dicCookies, p_strSavePath, p_booUseDefaultFileName, m_intMaxConnections, m_intMinBlockSize, m_strUserAgent);
m_steState = new State(true, uriURL, p_dicCookies, p_strSavePath, p_booUseDefaultFileName);
m_fdrDownloader.DownloadComplete += new EventHandler<CompletedDownloadEventArgs>(Downloader_DownloadComplete);
ShowItemProgress = false;
OverallProgressMaximum = (Int64)(m_fdrDownloader.FileSize / 1024);
OverallProgressMinimum = 0;
OverallProgressStepSize = 1;
OverallProgress = (Int64)m_fdrDownloader.DownloadedByteCount;
if (Status == TaskStatus.Cancelling)
retries = m_intRetries;
else if (Status == TaskStatus.Paused)
break;
if (!m_fdrDownloader.FileExists)
{
if (m_fdrDownloader.FileNotFound)
{
swRetry.Start();
retries = 1;
OverallMessage = String.Format("File not found on this server, retrying.. ({0}/{1})", retries, m_intRetries);
Status = TaskStatus.Retrying;
if (i++ == p_uriURL.Count)
{
Status = TaskStatus.Error;
OnTaskEnded(String.Format("File does not exist: {0}", uriURL.ToString()), null);
return;
}
ItemProgress = i;
uriURL = p_uriURL[i];
while ((swRetry.ElapsedMilliseconds < m_intRetryInterval) && swRetry.IsRunning)
{
if ((Status == TaskStatus.Cancelling) || (Status == TaskStatus.Paused) || (Status == TaskStatus.Queued))
break;
}
swRetry.Stop();
swRetry.Reset();
}
else if (m_fdrDownloader.ErrorCode == "666")
{
ErrorCode = m_fdrDownloader.ErrorCode;
ErrorInfo = m_fdrDownloader.ErrorInfo;
Status = TaskStatus.Error;
OnTaskEnded(m_fdrDownloader.ErrorInfo, null);
return;
}
else if (++retries <= m_intRetries)
{
swRetry.Start();
OverallMessage = String.Format("Server busy or unavailable, retrying.. ({0}/{1})", retries, m_intRetries);
Status = TaskStatus.Retrying;
if ((retries == m_intRetries) && (++i < p_uriURL.Count))
{
ItemProgress = i;
retries = 1;
uriURL = p_uriURL[i];
}
while ((swRetry.ElapsedMilliseconds < m_intRetryInterval) && swRetry.IsRunning)
{
if ((Status == TaskStatus.Cancelling) || (Status == TaskStatus.Paused) || (Status == TaskStatus.Queued))
break;
}
swRetry.Stop();
swRetry.Reset();
}
else
{
Status = TaskStatus.Error;
OnTaskEnded(String.Format("Error trying to get the file: {0}", uriURL.ToString()), null);
return;
}
}
else
{
break;
}
}
if (ModRepository.IsOffline)
this.Pause();
else if (Status == TaskStatus.Running)
{
m_fdrDownloader.StartDownload();
m_tmrUpdater.Start();
}
}
/// <summary>
/// Halts the file download.
/// </summary>
/// <remarks>
/// After being disposed, that is no guarantee that the task's status will be correct. Further
/// interaction with the object is undefined.
/// </remarks>
public void Dispose()
{
if (m_fdrDownloader != null)
{
m_fdrDownloader.DownloadComplete -= new EventHandler<CompletedDownloadEventArgs>(Downloader_DownloadComplete);
m_fdrDownloader.Stop();
m_fdrDownloader = null;
}
}
/// <summary>
/// Downloads the specified file, and returns the local path where the file was saved.
/// </summary>
/// <param name="p_uriUrl">The URL of the file to download.</param>
/// <returns>The local path where the specified file was saved.</returns>
protected string DownloadFile(Uri p_uriUrl)
{
//TODO get the block size from settings
FileDownloader fdrDownloader = new FileDownloader(p_uriUrl, null, EnvironmentInfo.TemporaryPath, true, 1, 500 * 1024, "");
fdrDownloader.DownloadComplete += new EventHandler<CompletedDownloadEventArgs>(Downloader_DownloadComplete);
fdrDownloader.StartDownload();
m_dicWaitForDownloads[fdrDownloader] = new AutoResetEvent(false);
m_dicWaitForDownloads[fdrDownloader].WaitOne();
string strFileName = m_dicSaveDownloadPaths[fdrDownloader];
m_dicSaveDownloadPaths.Remove(fdrDownloader);
m_dicWaitForDownloads.Remove(fdrDownloader);
return strFileName;
}
