private static int SubscribeAndProcessCloudBuildEvents()
{
if (!(TraceEventSession.IsElevated() ?? false))
{
Error("Not elevated; exiting");
return(-1);
}
// BuildXL.Tracing.ETWLogger guid
if (!Guid.TryParse("43b71382-88db-5427-89d5-0b46476f8ef4", out Guid guid))
{
Error("Could not parse guid; exiting");
return(-1);
}
Console.WriteLine("Listening for cloud build events");
// Create an unique session
string sessionName = "DropDaemon ETW Session";
// the null second parameter means 'real time session'
using (TraceEventSession traceEventSession = new TraceEventSession(sessionName, null))
{
// Note that sessions create a OS object (a session) that lives beyond the lifetime of the process
// that created it (like Files), thus you have to be more careful about always cleaning them up.
// An importantly way you can do this is to set the 'StopOnDispose' property which will cause
// the session to
// stop (and thus the OS object will die) when the TraceEventSession dies. Because we used a 'using'
// statement, this means that any exception in the code below will clean up the OS object.
traceEventSession.StopOnDispose = true;
traceEventSession.EnableProvider(guid, matchAnyKeywords: (ulong)Keywords.CloudBuild);
// Prepare to read from the session, connect the ETWTraceEventSource to the session
using (ETWTraceEventSource etwTraceEventSource = new ETWTraceEventSource(
sessionName,
TraceEventSourceType.Session))
{
DynamicTraceEventParser dynamicTraceEventParser = new DynamicTraceEventParser(etwTraceEventSource);
dynamicTraceEventParser.All += traceEvent =>
{
Possible <CloudBuildEvent, Failure> possibleEvent = CloudBuildEvent.TryParse(traceEvent);
if (!possibleEvent.Succeeded)
{
Error(possibleEvent.Failure.ToString());
return;
}
CloudBuildEvent eventObj = possibleEvent.Result;
Console.WriteLine("*** Event received: " + eventObj.Kind);
};
etwTraceEventSource.Process();
}
}
Console.WriteLine("FINISHED");
Thread.Sleep(100000);
return(0);
}
/// <inheritdoc />
protected override void OnEventWritten(EventWrittenEventArgs eventData)
{
var ev = CloudBuildEvent.TryParse(
eventData.EventName,
eventData.Payload);
Contract.Assert(ev.Succeeded, "expected to be able to parse received ETW event into CloudBuildEvent");
m_receivedEvents.Enqueue(ev.Result);
}
