protected override void Inject(SpanContext spanContext, ITextMap carrier)
{
carrier.Set(TraceIdName, HexCodec.ToLowerHex(spanContext.TraceId.High, spanContext.TraceId.Low));
if (spanContext.ParentId != 0L)
{
// Conventionally, parent id == 0 means the root span
carrier.Set(ParentSpanIdName, HexCodec.ToLowerHex(spanContext.ParentId));
}
carrier.Set(SpanIdName, HexCodec.ToLowerHex(spanContext.SpanId));
carrier.Set(SampledName, spanContext.IsSampled ? "1" : "0");
if (spanContext.IsDebug)
{
carrier.Set(FlagsName, "1");
}
}
protected override SpanContext Extract(ITextMap carrier)
{
long? traceId = null;
long? spanId = null;
long? parentId = 0L; // Conventionally, parent id == 0 means the root span
SpanContextFlags flags = SpanContextFlags.None;
foreach (var entry in carrier)
{
if (string.Equals(entry.Key, SampledName, StringComparison.OrdinalIgnoreCase))
{
string value = entry.Value;
if (string.Equals(value, "1", StringComparison.Ordinal) || string.Equals(value, "true", StringComparison.OrdinalIgnoreCase))
{
flags |= SpanContextFlags.Sampled;
}
}
else if (string.Equals(entry.Key, TraceIdName, StringComparison.OrdinalIgnoreCase))
{
traceId = HexCodec.LowerHexToUnsignedLong(entry.Value);
}
else if (string.Equals(entry.Key, ParentSpanIdName, StringComparison.OrdinalIgnoreCase))
{
parentId = HexCodec.LowerHexToUnsignedLong(entry.Value);
}
else if (string.Equals(entry.Key, SpanIdName, StringComparison.OrdinalIgnoreCase))
{
spanId = HexCodec.LowerHexToUnsignedLong(entry.Value);
}
else if (string.Equals(entry.Key, FlagsName, StringComparison.OrdinalIgnoreCase))
{
if (string.Equals(entry.Value, "1", StringComparison.OrdinalIgnoreCase))
{
flags |= SpanContextFlags.Debug;
}
}
}
if (traceId != null && parentId != null && spanId != null)
{
return(new SpanContext(new TraceId(traceId.Value), new SpanId(spanId.Value), new SpanId(parentId.Value), flags));
}
return(null);
}