private static SpanContext ExtractPropagatedContext(IPropagator propagator, HttpRequest request)
{
try
{
// extract propagation details from http headers
var requestHeaders = request.Headers;
if (requestHeaders != null)
{
var headersCollection = new DictionaryHeadersCollection();
foreach (var header in requestHeaders)
{
string key = header.Key;
string[] values = header.Value.ToArray();
if (key != null && values.Length > 0)
{
headersCollection.Add(key, values);
}
}
return(propagator.Extract(headersCollection));
}
}
catch (Exception ex)
{
Log.Error(ex, "Error extracting propagated HTTP headers.");
}
return(null);
}
public ISpanContext Extract <TCarrier>(IFormat <TCarrier> format, TCarrier carrier)
{
if ((format == BuiltinFormats.TextMap || format == BuiltinFormats.HttpHeaders) &&
carrier is ITextMap textMap)
{
return(_propagator.Extract(textMap));
}
throw new ZipkinFormatException(
$"Unrecognized carrier format [{format}]. Only ITextMap is supported by this driver.");
}
public global::OpenTracing.ISpanContext Extract(object carrier)
{
var map = carrier as ITextMap;
if (map == null)
{
throw new ArgumentException("Carrier should have type ITextMap", nameof(carrier));
}
IHeadersCollection headers = new TextMapHeadersCollection(map);
var propagationContext = _propagator.Extract(headers);
return(new OpenTracingSpanContext(propagationContext));
}
/// <inheritdoc />
public ISpanContext Extract <TCarrier>(IFormat <TCarrier> format, TCarrier carrier)
{
var ctx = _propagator.Extract(format, carrier);
if (_options.EnableMetaEventLogging)
{
this.BuildSpan(LightStepConstants.MetaEvent.ExtractOperation)
.IgnoreActiveSpan()
.WithTag(LightStepConstants.MetaEvent.MetaEventKey, true)
.WithTag(LightStepConstants.MetaEvent.SpanIdKey, ctx.SpanId)
.WithTag(LightStepConstants.MetaEvent.TraceIdKey, ctx.TraceId)
.WithTag(LightStepConstants.MetaEvent.PropagationFormatKey, format.GetType().ToString())
.Start()
.Finish();
}
return(ctx);
}
public static SpanContext Extract(this IPropagator propagator, IHeadersCollection headers)
{
return(propagator.Extract(headers, ExtractFromHeadersCollection));
}
/// <inheritdoc />
public ISpanContext Extract <TCarrier>(IFormat <TCarrier> format, TCarrier carrier)
{
return(_propagator.Extract(format, carrier));
}