// See https://github.com/aspnet/AspNetCore/blob/master/src/Hosting/Hosting/src/Internal/HostingApplicationDiagnostics.cs
public static void InitFromMessageHeaders(this Activity activity, MessageHeaderCollection headers)
{
var traceId = headers.GetValue(DiagnosticsConstants.TraceIdHeaderKey);
if (!string.IsNullOrEmpty(traceId))
{
// This will reflect, that the current activity is a child of the activity
// which is represented in the message.
activity.SetParentId(traceId);
var traceState = headers.GetValue(DiagnosticsConstants.TraceStateHeaderKey);
if (!string.IsNullOrEmpty(traceState))
{
activity.TraceStateString = traceState;
}
// We expect baggage to be empty by default.
// Only very advanced users will be using it in near future, we encourage them to keep baggage small (few items).
var baggage = headers.GetValue(DiagnosticsConstants.TraceBaggageHeaderKey);
if (BaggageConverter.TryDeserialize(baggage, out var baggageItems))
{
activity.AddBaggageRange(baggageItems);
}
}
}
public void AddBaggageRange_SomeNewItems_ItemsAreAppended()
{
var activity = new Activity("test");
IList <KeyValuePair <string, string> > itemsToAdd = new List <KeyValuePair <string, string> >
{
new KeyValuePair <string, string>("key1", "value1"),
new KeyValuePair <string, string>("key2", "value2"),
new KeyValuePair <string, string>("key3", "value3")
};
activity.AddBaggage("key0", "value0");
activity.AddBaggageRange(itemsToAdd);
activity.Baggage.Should().BeEquivalentTo(
new KeyValuePair <string, string>("key0", "value0"),
new KeyValuePair <string, string>("key1", "value1"),
new KeyValuePair <string, string>("key2", "value2"),
new KeyValuePair <string, string>("key3", "value3"));
}
