protected override void Append(LoggingEvent loggingEvent)
{
try
{
var syslogMessage = new SysLogMessage
{
Priority = GeneratePriority(Facility, GetSeverity(loggingEvent.Level)),
Header = new SysLogHeader
{
TimeStamp = DateTime.Now,
HostName = CalculateHostName(Identity, loggingEvent)
},
Body = CalculateBody(loggingEvent),
};
List <SysLogMessage> packets = SplitLongMessagesAsNeeded(syslogMessage);
foreach (SysLogMessage packet in packets)
{
string packetContents = packet.AsUdpString();
Byte[] buffer = Encoding.GetBytes(packetContents.ToCharArray());
Client.Send(buffer, buffer.Length, RemoteEndPoint);
}
}
catch (Exception e)
{
ErrorHandler.Error(
"Unable to send logging event to remote syslog " +
RemoteAddress +
" on port " +
RemotePort + ".",
e,
ErrorCode.WriteFailure);
}
}
public static List <SysLogMessage> SplitLongMessagesAsNeeded(SysLogMessage message)
{
const int maxUdpLength = 1000;
if (message.AsUdpString().Length < maxUdpLength)
{
return new List <SysLogMessage> {
message
}
}
;
const string splitBodySuffix = " [SplitMessageID {0} part {1:000} of {2:000}]";
string messageGuidAsString = Guid.NewGuid().ToString("B").ToUpperInvariant();
string sampleSuffix = String.Format(splitBodySuffix, messageGuidAsString, 0, 0);
int bodyLengthPerMessage = maxUdpLength - message.PriAndHeaderLength - sampleSuffix.Length;
if (bodyLengthPerMessage < 0)
{
throw new ArgumentException("Cannot log message with splitting because header is longer than message length.");
}
var numberOfSplits = (int)Math.Ceiling((double)message.Body.Length / bodyLengthPerMessage);
var messages = new List <SysLogMessage>();
for (int i = 0; i < numberOfSplits; ++i)
{
int startingIndex = i * bodyLengthPerMessage;
int lengthOfFragment = Math.Min(bodyLengthPerMessage, message.Body.Length - startingIndex);
string pieceOfOriginalBody = message.Body.Substring(startingIndex, lengthOfFragment);
string splitMessageMarker = string.Format(splitBodySuffix, messageGuidAsString, i + 1, numberOfSplits);
string bodyFragment = String.Format("{0}{1}", pieceOfOriginalBody, splitMessageMarker);
var messageFragment = new SysLogMessage(message)
{
Body = bodyFragment
};
messages.Add(messageFragment);
}
return(messages);
}
public SysLogMessage(SysLogMessage message)
{
Body = message.Body;
Priority = message.Priority;
Header = message.Header;
}
