public IRequestSpan AddEvent(string name, DateTimeOffset?timestamp = null)
{
var activityEvent = new ActivityEvent(name, timestamp ?? default);
_activity?.AddEvent(activityEvent);
return(this);
}
private static void DoWork(IDatabase db, ActivitySource activitySource)
{
// Start another activity. If another activity was already started, it'll use that activity as the parent activity.
// In this example, the main method already started a activity, so that'll be the parent activity, and this will be
// a child activity.
using (Activity activity = activitySource.StartActivity("DoWork"))
{
try
{
db.StringSet("key", "value " + DateTime.Now.ToLongDateString());
System.Console.WriteLine("Doing busy work");
Thread.Sleep(1000);
// run a command, in this case a GET
var myVal = db.StringGet("key");
System.Console.WriteLine(myVal);
}
catch (ArgumentOutOfRangeException e)
{
// Set status upon error
activity.AddTag(SpanAttributeConstants.StatusCodeKey, SpanHelper.GetCachedCanonicalCodeString(Status.Internal.CanonicalCode));
activity.AddTag(SpanAttributeConstants.StatusDescriptionKey, e.ToString());
}
// Annotate our activity to capture metadata about our operation
var attributes = new Dictionary <string, object>
{
{ "use", "demo" },
};
activity.AddEvent(new ActivityEvent("Invoking DoWork", attributes));
}
}
public async Task <IActionResult> Post([FromBody] GreetingIn input)
{
_logger.LogTrace("Request Input: {@Input}", input);
// this silly logic is so we can show a trace that never went past this point
if (input.Name == "string")
{
_logger.LogWarning("Tricksy hackerses, we hates them!");
// add a tag to the current activity, so we know why the request died
Activity.Current?.AddTag("illegal.input", input.Name);
// I realize this is mixing movie quotes
return(Ok(
new GreetingOut {
Message = "You're trying to trick me into giving something away... It won't work!"
}
));
}
// start a new child activity since we're about to call the service (for request/reply capture)
using Activity callRpcActivity = _activitySource.StartActivity("Call-Grpc-Service");
try
{
// capture rpc request parameters
var rpcRequest = new HelloRequest {
Name = input.Name
};
callRpcActivity?.AddTag("rpc.request", rpcRequest.ToString());
// send greeting via gRPC
HelloReply reply = await _greeterClient.SayHelloAsync(
request : rpcRequest,
deadline : DateTime.UtcNow.AddSeconds(8)
);
_logger.LogDebug("Service replied with {@reply}", reply);
// capture reply - not usually appropriate in production
callRpcActivity?.AddTag("rpc.reply", reply.ToString());
// all good
return(Ok(
new GreetingOut {
Message = reply.Message
}
));
}
catch (RpcException ex)
{
// record error information in the trace
callRpcActivity?.AddTag("error.status", ex.StatusCode.ToString());
callRpcActivity?.AddEvent(new ActivityEvent(ex.Message));
// not really the right thing to do, but fine for this sample
return(BadRequest());
}
}
public void TestActivityWithListenerActivityCreateAndAllDataRequested()
{
RemoteExecutor.Invoke(() => {
using (ActivitySource aSource = new ActivitySource("SourceActivityListener"))
{
int counter = 0;
Assert.False(aSource.HasListeners());
using (ActivityListener listener = new ActivityListener
{
ActivityStarted = activity => counter++,
ActivityStopped = activity => counter--,
ShouldListenTo = (activitySource) => object.ReferenceEquals(aSource, activitySource),
GetRequestedDataUsingParentId = (ref ActivityCreationOptions <string> activityOptions) => ActivityDataRequest.AllDataAndRecorded,
GetRequestedDataUsingContext = (ref ActivityCreationOptions <ActivityContext> activityOptions) => ActivityDataRequest.AllDataAndRecorded
}
)
{
ActivitySource.AddActivityListener(listener);
Assert.True(aSource.HasListeners());
using (Activity activity = aSource.StartActivity("AllDataRequestedActivity"))
{
Assert.NotNull(activity);
Assert.True(activity.IsAllDataRequested);
Assert.Equal(1, counter);
Assert.Equal(0, activity.Tags.Count());
Assert.Equal(0, activity.Baggage.Count());
Assert.True(object.ReferenceEquals(activity, activity.AddTag("key", "value")));
Assert.True(object.ReferenceEquals(activity, activity.AddBaggage("key", "value")));
Assert.Equal(1, activity.Tags.Count());
Assert.Equal(1, activity.Baggage.Count());
using (Activity activity1 = aSource.StartActivity("AllDataRequestedActivity1"))
{
Assert.NotNull(activity1);
Assert.True(activity1.IsAllDataRequested);
Assert.Equal(2, counter);
Assert.Equal(0, activity1.Links.Count());
Assert.Equal(0, activity1.Events.Count());
Assert.True(object.ReferenceEquals(activity1, activity1.AddEvent(new ActivityEvent("e1"))));
Assert.Equal(1, activity1.Events.Count());
}
Assert.Equal(1, counter);
}
Assert.Equal(0, counter);
}
}
}).Dispose();
}
public static async Task Main(string[] args)
{
// create the tracer to export the traces
CreateTracerProvider();
// attach a listener to generate activities
// the listener has callbacks to log at ActivityStart and ActivityEnd
ActivitySource.AddActivityListener(GetBatchActivityListener());
// get the metrics api to generate Histograms
IMetricsRoot metricsRoot = GetMetricsRoot();
Context context = null;
// instrument first activity
// sleep for 250ms and add test tag
List <KeyValuePair <string, object> > batchAttribute = new List <KeyValuePair <string, object> > {
new KeyValuePair <string, object>("batch", "1")
};
var worker1 = new InstrumentedWorker("Test activity", ActivityKind.Server, null, batchAttribute, () => Thread.Sleep(250), ActivitySource);
Activity firstActivity = worker1.DoWork();
if (firstActivity?.IsAllDataRequested == true)
{
firstActivity.SetTag("Test tag", "A value for a custom tag");
metricsRoot.Measure.Histogram.Update(SampleHistogram, Convert.ToInt64(firstActivity.Duration.Milliseconds));
context = new Context(firstActivity.Context);
}
// instrument second activity
// sleep for 350 ms
batchAttribute[0] = new KeyValuePair <string, object>("batch", "2");
var worker2 = new InstrumentedWorker("Another test activity", ActivityKind.Server, context, batchAttribute, () => Thread.Sleep(350), ActivitySource);
Activity secondActivity = worker2.DoWork();
if (secondActivity?.IsAllDataRequested == true)
{
metricsRoot.Measure.Histogram.Update(SampleHistogram, Convert.ToInt64(secondActivity.Duration.Milliseconds));
context = new Context(secondActivity.Context);
}
// instrument third activity, keep it opened
// sleep for 500 ms and add events
batchAttribute[0] = new KeyValuePair <string, object>("batch", "3");
var worker3 = new InstrumentedWorker("Third test activity", ActivityKind.Internal, context, batchAttribute, () => Thread.Sleep(500), ActivitySource);
Activity thirdActivity = worker3.StartWork();
if (thirdActivity?.IsAllDataRequested == true)
{
thirdActivity.AddEvent(new ActivityEvent("An event"));
Thread.Sleep(500);
thirdActivity.AddEvent(new ActivityEvent("An event 500ms later"));
context = new Context(thirdActivity.Context);
}
// add event using current activity
Activity.Current?.AddEvent(new ActivityEvent("An event added to the current activity"));
// instrument fourth activity as a nested activity
// sleep for 500 ms
batchAttribute[0] = new KeyValuePair <string, object>("batch", "4");
var worker4 = new InstrumentedWorker("Nested activity", ActivityKind.Client, context, batchAttribute, () => Thread.Sleep(500), ActivitySource);
Activity fourthActivity = worker4.DoWork();
if (fourthActivity?.IsAllDataRequested == true)
{
metricsRoot.Measure.Histogram.Update(SampleHistogram, Convert.ToInt64(fourthActivity.Duration.Milliseconds));
}
// stop 3rd activity
thirdActivity = worker3.StopWork();
if (thirdActivity != null)
{
metricsRoot.Measure.Histogram.Update(SampleHistogram, Convert.ToInt64(thirdActivity.Duration.Milliseconds));
}
// export the metrics
await Task.WhenAll(metricsRoot.ReportRunner.RunAllAsync());
tracerProvider.Shutdown();
}
