protected virtual bool IsServerCompatible( PopClient client )
{
foreach( string capability in client.Capabilities() )
{
if( 0 == string.Compare( capability, "uidl", true ) )
return true;
}
return false;
}
private int FetchMessages()
{
int count = 0;
using(
PopClient client = new PopClient()
{
Host = ConnectInfo.Host,
Port = ConnectInfo.TcpPort,
Username = ConnectInfo.Username,
Password = ConnectInfo.Password,
SslNegotiationMode = ConnectInfo.SslNegotiationMode,
SslProtocol = ConnectInfo.SslProtocol,
ReceiveTimeOut = ConnectInfo.Timeout,
SendTimeOut = ConnectInfo.Timeout
} )
{
string name = null;
try
{
client.ConnectAndAuthenticate();
if( !IsServerCompatible( client ) )
throw new NotSupportedException( "The server is not compatible. Please use a server that supports UIDL." );
OnCountReceived( client.GetMessageCount().ToString() );
_errorCount = 0; //if we get here, then the server is talking to us.
foreach( PopUid uid in client.GetMessageUids() )
{
/*
if( count >= 20 ) //DEBUG: short circuit here to watch threads exit
return 0;
*/
if( MessageFileExists( uid.UniqueIdentifier ) )
{
OnPreviousDownloaded( uid.UniqueIdentifier );
client.DeleteMessage( uid.MessageNumber );
}
else
{
OnMessageRequested( uid.MessageNumber + " -> " + uid.UniqueIdentifier );
string temp = ConnectInfo.PathInfo.TempDownloadFile;
using( Stream stream = File.Create( temp ) )
client.WriteMessageToStream( stream, uid.MessageNumber );
name = StripIllegalFilenameChars( uid.UniqueIdentifier );
name = ConnectInfo.PathInfo.QueueDirectory + Path.DirectorySeparatorChar + name + ".eml";
File.Move( temp, name );
client.DeleteMessage( uid.MessageNumber );
count++;
OnMessageReceived( name );
}
}
}
catch( IOException ex )
{
_errorCount++;
client.Disconnect();
SocketException se;
if( null != (se = ex.InnerException as SocketException) )
{
if( ((int)SocketError.TimedOut == se.ErrorCode) )
{
if( ConnectInfo.Timeout < PopConnectInfo.MaxTimeout )
{
if( ConnectInfo.Timeout < PopConnectInfo.MinTimeout )
ConnectInfo.Timeout = PopConnectInfo.MinTimeout;
else
ConnectInfo.Timeout *= 2;
}
}
}
Debug.WriteLine( ex );
OnServerError( ex.Message, ex );
if( null == name )
File.Delete( name );
if( _errorCount < MaxErrors )
{
Thread.Sleep( ErrorSleepTimeout );
return FetchMessages();
}
else
Die( ex );
}
catch( PopServerResponseErrException ex )
{
_errorCount++;
client.Disconnect();
Debug.WriteLine( ex );
OnServerError( ex.Message, ex );
if( null == name )
File.Delete( name );
if( _errorCount < MaxErrors )
{
Thread.Sleep( ErrorSleepTimeout );
return FetchMessages();
}
else
Die( ex );
}
}
return count;
}
