CODEWITHSUNDEEP
wcflogging
Alex
Alex

Reputation: 551

How to rotate WCF log when maxMessagesToLog is reached?

I have a WCF service and want to enable logging. As described in Microsoft's documentation Configuring Message Logging, I put in the Web.config the following:

<system.diagnostics>  
  <sources>  
    <source name="System.ServiceModel.MessageLogging">  
      <listeners>  
         <add name="messages"  
              type="System.Diagnostics.XmlWriterTraceListener"  
              initializeData="c:\logs\messages.svclog" />  
        </listeners>  
    </source>  
  </sources>  
</system.diagnostics>  

<system.serviceModel>  
  <diagnostics>  
    <messageLogging   
         logEntireMessage="true"   
         logMalformedMessages="false"  
         logMessagesAtServiceLevel="true"   
         logMessagesAtTransportLevel="false"  
         maxMessagesToLog="3000"  
         maxSizeOfMessageToLog="2000"/>  
  </diagnostics>  
</system.serviceModel>

How can I rotate the log, for example write to messages1.svclog, then messages2.svclog, etc. when the number of messages in the last log has reached maxMessagesToLog=3000?

I read the article A Rolling XmlWriterTraceListener, but this rotates the log file when a certain file size has been reached. However, when the number of messages reaches maxMessagesToLog, WCF will stop logging.

Upvotes: 1

Views: 1280

Answers (2)

falk0069
falk0069

Reputation: 1

Another option is to use symbolic links. You can delete and reset symbolic link while IIS is running. Then when it recycles or restarts a new file will be created.

for example you can create a symbolic link with a command like this:

mklink server_tracelog.svclog server_tracelog_1.svclog

You then set in the web.config this file 'server_tracelog.svclog', but this will be the real file it writes to 'server_tracelog_1.svclog'

Then maybe using a schedule task you could run a batch file that has something like this:

REM set day of week as %DAYOFWEEK%
for /f %%a in ('wmic path win32_localtime get DAYOFWEEK /format:list ^| findstr "="') do (set %%a)

del server_tracelog.svclog
del server_tracelog_dayofweek_%DAYOFWEEK%.svclog
mklink server_tracelog.svclog server_tracelog_dayofweek_%DAYOFWEEK%.svclog

Then if your app pool recycles once a day, you will have a new log created each day.

Upvotes: 0

Alex
Alex

Reputation: 551

I was not able to find out how to rotate the log file before maxMessagesToLog is reached.

I decided to rotate the log file every midnight. Setting maxMessagesToLog to max integer = 2147483647, the number of messages in one day will never exceed that value. I used the custom trace listener as described in the WCF Forum.

public class CustomTraceListener : XmlWriterTraceListener
{
    public CustomTraceListener(string fileName)
        : base(string.Format(fileName,
                  string.Format("{0}{1}{2}", DateTime.Now.Day, DateTime.Now.Month, DateTime.Now.Year)))
    {
    }
}

<system.diagnostics>
  <sources>
    <source name="System.ServiceModel.MessageLogging">
      <listeners>
        <add name="traceListener"
            type="MyService.CustomTraceListener, MyService"
            initializeData= "c:\wcflogs\messages_{0}.svclog" />
      </listeners>
    </source>
  </sources>
</system.diagnostics>

I created my application pool with Recycling Specific Times = 00:00:00

appcmd add apppool /name:MyApppool/enable32BitAppOnWin64:true /+recycling.periodicRestart.schedule.[value='00:00:00']

The advanced settings of the application pool look with this command as follows:

enter image description here

Therefore, the process is recycled every midnight, and the messages counter starts from 0. As long as I have less then 2 billion messages per day, I will have all messages in the log file.

Upvotes: 1

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