Initial QSfera import

Server/services/webfinger/pkg/service/v0/tracing.go

@@ -0,0 +1,38 @@
+package service
+
+import (
+	"context"
+	"net/url"
+
+	"github.com/qsfera/server/services/webfinger/pkg/webfinger"
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/trace"
+)
+
+// NewTracing returns a service that instruments traces.
+func NewTracing(next Service, tp trace.TracerProvider) Service {
+	return tracing{
+		next: next,
+		tp:   tp,
+	}
+}
+
+type tracing struct {
+	next Service
+	tp   trace.TracerProvider
+}
+
+// Webfinger implements the Service interface.
+func (t tracing) Webfinger(ctx context.Context, queryTarget *url.URL, rels []string, platform string) (webfinger.JSONResourceDescriptor, error) {
+	spanOpts := []trace.SpanStartOption{
+		trace.WithSpanKind(trace.SpanKindServer),
+		trace.WithAttributes(
+			attribute.KeyValue{Key: "query_target", Value: attribute.StringValue(queryTarget.String())},
+			attribute.KeyValue{Key: "rels", Value: attribute.StringSliceValue(rels)},
+		),
+	}
+	ctx, span := t.tp.Tracer("webfinger").Start(ctx, "Webfinger", spanOpts...)
+	defer span.End()
+
+	return t.next.Webfinger(ctx, queryTarget, rels, platform)
+}