private SpanContext CreateChildSpanContext()
{
var traceId = new TraceId(RandomGenerator.RandomId(), RandomGenerator.RandomId());
var parentId = new SpanId(0);
var spanId = new SpanId(traceId.Low);
var baggage = new Dictionary <string, string>();
var flags = ContextFlags.None;
var(isSampled, samplerTags) = _sampler.IsSampled(traceId, _operationName);
if (isSampled)
{
foreach (var samplingTag in samplerTags)
{
_tags[samplingTag.Key] = samplingTag.Value;
}
flags |= ContextFlags.Sampled;
_metrics.TraceStartedSampled.Inc(1);
}
else
{
_metrics.TraceStartedNotSampled.Inc(1);
}
var spanContext = new SpanContext(traceId, spanId, parentId, baggage, flags);
return(spanContext);
}
public void Tracer_BuildSpan_ShouldPassItselfAndOperationNameToSpanBuilder()
{
_mockSampler.IsSampled(Arg.Any <TraceId>(), Arg.Any <string>()).Returns((false, new Dictionary <string, object>()));
var span = (ILetsTraceSpan)_builtTracer.BuildSpan(_operationName).Start();
Assert.Equal(_operationName, span.OperationName);
Assert.Equal(_builtTracer, span.Tracer);
}
public void IsSampled_ShouldCallSampler()
{
var op = "op";
var traceId = new TraceId(452);
_mockSampler.IsSampled(Arg.Is <TraceId>(tid => tid == traceId), Arg.Is <string>(on => on == op))
.Returns((true, new Dictionary <string, object>()));
var isSampled = _testingSampler.IsSampled(traceId, op);
Assert.True(isSampled.Sampled);
_mockSampler.Received(1).IsSampled(Arg.Any <TraceId>(), Arg.Any <string>());
}
public (bool Sampled, Dictionary <string, object> Tags) IsSampled(TraceId id, string operation)
{
var operationKey = operation.ToLower();
if (_samplers.TryGetValue(operationKey, out var sampler))
{
return(sampler.IsSampled(id, operation));
}
if (_samplers.Count >= _maxOperations)
{
return(_defaultSampler.IsSampled(id, operation));
}
var newSampler = (IGuaranteedThroughputProbabilisticSampler)_factory.NewGuaranteedThroughputProbabilisticSampler(_samplingRate, _lowerBound);
_samplers[operationKey] = newSampler;
return(newSampler.IsSampled(id, operation));
}
/// <summary>
/// Use the <see cref="ISampler"/> to make a sampling decision.
/// </summary>
/// <returns>
/// The current <see cref="SpanContext"/>.
/// </returns>
public SpanContext Sample(ISampler sampler)
{
Sampled = sampler.IsSampled(this);
return(this);
}