log4net.Azure

An appender that plugs into the Trace-pipeline w/ the logging that Windows Azure uses.

Requirements:

• .Net 4.0
• libs from above

Using it:

First, install it; install-package log4net.Azure

Secondly, use it;

public class Log4NetSampleWorker : RoleEntryPoint
{
	private static readonly ILog _logger = LogManager.GetLogger(typeof (Log4NetSampleWorker));

	public override void Run()
	{
		_logger.InfoFormat("{0}'s entry point called", typeof(Log4NetSampleWorker).Name);

		while (true)
		{
			Thread.Sleep(10000);
			_logger.Debug("Working...");
		}
	}

	public override bool OnStart()
	{
		BasicConfigurator.Configure(AzureAppender.New(conf =>
			{
				conf.Level = "Debug";
				conf.ConfigureRepository((repo, mapper) =>
					{
						repo.Threshold = mapper("Debug"); // root (defaults to 'All')
					});
			}));

		return base.OnStart();
	}
}

The configurator gives you access to doing things like this as well;

BasicConfigurator.Configure(AzureAppender.New(conf =>
	{
		/* in this case we say that appender should be in debug mode
			* but that we should only transfer logs to storage that is information-level
			* or above.
			* 
			* That doesn't make sense unless you're also doing debugging and want the debug
			* output in the trace viewer or you have another trace message sink.
			* 
			* Please note the wonderful *three* types of logging levels here! Nice. Not to
			* mention that you can do the equivalent of conf.Level = "Debug" in the cscfg file.
			*/

		conf.Level = "Debug";

		conf.ConfigureRepository((repo, mapper) =>
			{
				repo.Threshold = mapper("Debug"); // root
			});

		conf.ConfigureAzureDiagnostics(dmc =>
			{
				dmc.Logs.ScheduledTransferLogLevelFilter = LogLevel.Information;
			});
	}));

Building:

1. Install libs: http://www.microsoft.com/download/en/details.aspx?displaylang=en&id=28045
2. Run gem install bundler (if not already installed)
3. Run gem install semver2 (if not already installed)
4. Run rake.

Assumes your diagnostics connection string is named: Microsoft.WindowsAzure.Plugins.Diagnostics.ConnectionString. It turns out one can't change this in the cscfg files in VS.

Optional Settings (that can also be set through the ConfigureAzureDiagnostics method call):

• Diagnostics.Level - level of logging, unless configured in code. Accepts { 'Debug', 'Info', 'Warn', 'Error', 'Fatal', 'Off', 'All' }. Defaults to 'Info'.
• Diagnostics.Layout - pattern layout, unless configured in code. Defaults to "%timestamp [%thread] %level %logger - %message%newline"
• Diagnostics.ScheduledTransferPeriod - transfer period, unless configured in code. [ms] Defaults to 60000 ms.
• Diagnostics.EventLogs - event-logs key. Defaults to Application!*;System!*

Want a feature? Put up an issue and send a pull request!

Some code from here: Ref: http://cloudshaper.wordpress.com/2010/10/30/logging-with-log4net-on-the-azure-platform/