private async Task Start(int attempts)
{
if (attempts > 200)
{
Status(false, "", "Stopped, too many retry attempts. Click on Start to resume the download");
return;
}
else if (attempts > 1)
Status(false, "", "Retrying...");
cancelSrc = new CancellationTokenSource();
StreamWriter filew = null;
StreamWriter indexw = null;
String file = null;
String dir = null;
try {
Validate();
if (attempts == 1)
{
lbStatus.Items.Clear();
lbStatus.Items.Refresh();
}
btnStart.Content = "Cancel";
btnBrowse.IsEnabled = false;
StringBuilder sb = new StringBuilder();
bool dldNotDone = false;
if ((bool)cbDownload.IsChecked)
{
String addr = cbAddr.Text;
if (imapAddr.ContainsKey(addr))
addr = imapAddr[addr];
dir = txtDownload.Text;
if (cbResume.IsChecked == true)
{
if (await Resume(addr) == false)
return;
dir = Path.GetDirectoryName(dir);
}
sb.AppendFormat(@"{0}\arch{1}.mbox", dir, DateTime.Now.ToFileTime());
file = sb.ToString();
String indexFile = Path.Combine(dir, "email_proc1596.index");
bool resume = false;
String downloadedFile = "";
if (File.Exists(indexFile))
{
using (StreamReader reader = new StreamReader(indexFile))
{
String line = reader.ReadLine();
if (line != null)
{
Match m = Regex.Match(line, "^([^ ]+) ([^ ]+) (.+)$");
if (m.Success && m.Groups[1].Value == addr && m.Groups[2].Value == txtUser.Text)
{
downloadedFile = m.Groups[3].Value;
file = downloadedFile;
}
}
}
}
if (downloadedFile == "")
{
using (StreamWriter writer = new StreamWriter(indexFile))
{
writer.WriteLine(addr + " " + txtUser.Text + " " + file);
}
}
else
{
file = downloadedFile;
resume = true;
}
filew = new StreamWriter(file, resume);
StateMachine sm = new StateMachine(cancelSrc.Token, addr, int.Parse(txtPort.Text), txtUser.Text, txtPassword.Password, file);
try
{
await sm.Start(
delegate (String format, object[] args)
{
Status(false, "", format, args);
},
async delegate (String mailbox, String message, String msgid, String msgnum)
{
if (indexw == null)
indexw = new StreamWriter(indexFile, true);
await SaveMessage(filew, indexw, mailbox, message, msgid, msgnum);
},
delegate (double progress) { prBar.Value = progress; }
);
}
catch (ServerIOException ex)
{
Status(false, "", ex.Message);
}
catch (TimeoutException ex)
{
Status(false, "", ex.Message);
}
catch (FailedException)
{
Status(false, "", "Failed to download");
}
catch (ConnectionFailedException ex)
{
Status(false, "", ex.Message);
}
catch (Exception ex)
{
Status(false, "", ex.Message);
}
finally
{
if (indexw != null)
indexw.Close();
indexw = null;
if (filew != null)
filew.Close();
filew = null;
}
if (cancelSrc.Token.IsCancellationRequested)
{
Status(false, "", "Cancelled");
return;
}
if (sm.mailboxes != null)
{
Status(false, "", "Downloaded email to {0}", file);
foreach (Mailbox mailbox in sm.mailboxes)
{
if (mailbox.cnt != mailbox.start)
{
dldNotDone = true;
break;
}
}
}
else
dldNotDone = true;
if (dldNotDone)
{
Status(false, "", "Download is not complete, retrying...");
Thread.Sleep(5000);
await Start(attempts + 1);
}
else
{
TimeSpan span = DateTime.Now - start_time;
Status(false, "", "Download time {0} seconds", span.TotalSeconds);
File.Delete(indexFile);
}
}
else
{
file = txtDownload.Text;
dir = Path.GetDirectoryName(txtDownload.Text);
}
if (dldNotDone == false && (bool)cbStatistics.IsChecked && !cancelSrc.Token.IsCancellationRequested)
{
EmailStats stats = new EmailStats(cancelSrc.Token);
await stats.Start(dir, file, Status, delegate(double progress) { prBar.Value = progress; });
prBar.Value = 100;
}
if (cancelSrc.Token.IsCancellationRequested)
Status(false, "", "Cancelled");
}
catch (FailedLoginException)
{
Status(false, "", "Login failed, invalid user or password");
}
catch (FailedException)
{
Status(false, "", "Failed to download");
}
catch (SslFailedException)
{
Status(false, "", "Failed to establish secure connection");
}
catch (ValidationException ex)
{
Status(false,"", ex.reason);
}
catch (CancelException)
{
Status(false, "", "Cancelled");
}
catch (Exception ex)
{
Status(false, "", ex.Message + " " + ex.StackTrace);
}
finally
{
prBar.IsIndeterminate = false;
prBar.Value = 0;
btnBrowse.IsEnabled = true;
btnStart.Content = "Start";
if (filew != null)
filew.Close();
if (indexw != null)
indexw.Close();
}
}
private async Task Start(int attempts)
{
if (attempts > 200)
{
Status(false, "", "Stopped, too many retry attempts. Click on Start to resume the download");
return;
}
else if (attempts > 1)
{
Status(false, "", "Retrying...");
}
cancelSrc = new CancellationTokenSource();
StreamWriter filew = null;
StreamWriter indexw = null;
String file = null;
String dir = null;
try {
Validate();
if (attempts == 1)
{
lbStatus.Items.Clear();
lbStatus.Items.Refresh();
}
btnStart.Content = "Cancel";
btnBrowse.IsEnabled = false;
StringBuilder sb = new StringBuilder();
bool dldNotDone = false;
if ((bool)cbDownload.IsChecked)
{
String addr = cbAddr.Text;
if (imapAddr.ContainsKey(addr))
{
addr = imapAddr[addr];
}
dir = txtDownload.Text;
if (cbResume.IsChecked == true)
{
if (await Resume(addr) == false)
{
return;
}
dir = Path.GetDirectoryName(dir);
}
sb.AppendFormat(@"{0}\arch{1}.mbox", dir, DateTime.Now.ToFileTime());
file = sb.ToString();
String indexFile = Path.Combine(dir, "email_proc1596.index");
bool resume = false;
String downloadedFile = "";
if (File.Exists(indexFile))
{
using (StreamReader reader = new StreamReader(indexFile))
{
String line = reader.ReadLine();
if (line != null)
{
Match m = Regex.Match(line, "^([^ ]+) ([^ ]+) (.+)$");
if (m.Success && m.Groups[1].Value == addr && m.Groups[2].Value == txtUser.Text)
{
downloadedFile = m.Groups[3].Value;
file = downloadedFile;
}
}
}
}
if (downloadedFile == "")
{
using (StreamWriter writer = new StreamWriter(indexFile))
{
writer.WriteLine(addr + " " + txtUser.Text + " " + file);
}
}
else
{
file = downloadedFile;
resume = true;
}
filew = new StreamWriter(file, resume);
StateMachine sm = new StateMachine(cancelSrc.Token, addr, int.Parse(txtPort.Text), txtUser.Text, txtPassword.Password, file);
try
{
await sm.Start(
delegate(String format, object[] args)
{
Status(false, "", format, args);
},
async delegate(String mailbox, String message, String msgid, String msgnum)
{
if (indexw == null)
{
indexw = new StreamWriter(indexFile, true);
}
await SaveMessage(filew, indexw, mailbox, message, msgid, msgnum);
},
delegate(double progress) { prBar.Value = progress; }
);
}
catch (ServerIOException ex)
{
Status(false, "", ex.Message);
}
catch (TimeoutException ex)
{
Status(false, "", ex.Message);
}
catch (FailedException)
{
Status(false, "", "Failed to download");
}
catch (ConnectionFailedException ex)
{
Status(false, "", ex.Message);
}
catch (Exception ex)
{
Status(false, "", ex.Message);
}
finally
{
if (indexw != null)
{
indexw.Close();
}
indexw = null;
if (filew != null)
{
filew.Close();
}
filew = null;
}
if (cancelSrc.Token.IsCancellationRequested)
{
Status(false, "", "Cancelled");
return;
}
if (sm.mailboxes != null)
{
Status(false, "", "Downloaded email to {0}", file);
foreach (Mailbox mailbox in sm.mailboxes)
{
if (mailbox.cnt != mailbox.start)
{
dldNotDone = true;
break;
}
}
}
else
{
dldNotDone = true;
}
if (dldNotDone)
{
Status(false, "", "Download is not complete, retrying...");
Thread.Sleep(5000);
await Start(attempts + 1);
}
else
{
TimeSpan span = DateTime.Now - start_time;
Status(false, "", "Download time {0} seconds", span.TotalSeconds);
File.Delete(indexFile);
}
}
else
{
file = txtDownload.Text;
dir = Path.GetDirectoryName(txtDownload.Text);
}
if (dldNotDone == false && (bool)cbStatistics.IsChecked && !cancelSrc.Token.IsCancellationRequested)
{
EmailStats stats = new EmailStats(cancelSrc.Token);
await stats.Start(dir, file, Status, delegate(double progress) { prBar.Value = progress; });
prBar.Value = 100;
}
if (cancelSrc.Token.IsCancellationRequested)
{
Status(false, "", "Cancelled");
}
}
catch (FailedLoginException)
{
Status(false, "", "Login failed, invalid user or password");
}
catch (FailedException)
{
Status(false, "", "Failed to download");
}
catch (SslFailedException)
{
Status(false, "", "Failed to establish secure connection");
}
catch (ValidationException ex)
{
Status(false, "", ex.reason);
}
catch (CancelException)
{
Status(false, "", "Cancelled");
}
catch (Exception ex)
{
Status(false, "", ex.Message + " " + ex.StackTrace);
}
finally
{
prBar.IsIndeterminate = false;
prBar.Value = 0;
btnBrowse.IsEnabled = true;
btnStart.Content = "Start";
if (filew != null)
{
filew.Close();
}
if (indexw != null)
{
indexw.Close();
}
}
}
