add history trace command

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

util/otelutil/jaeger.go

@@ -0,0 +1,45 @@
+package otelutil
+
+import (
+	"fmt"
+
+	"github.com/docker/buildx/util/otelutil/jaeger"
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/sdk/resource"
+)
+
+type JaegerData struct {
+	Data []jaeger.Trace `json:"data"`
+}
+
+// JaegerData return Jaeger data compatible with ui import feature.
+// https://github.com/jaegertracing/jaeger-ui/issues/381#issuecomment-494150826
+func (s Spans) JaegerData() JaegerData {
+	roSpans := s.ReadOnlySpans()
+
+	// fetch default service.name from default resource for backup
+	var defaultServiceName string
+	defaultResource := resource.Default()
+	if value, exists := defaultResource.Set().Value(attribute.Key("service.name")); exists {
+		defaultServiceName = value.AsString()
+	}
+
+	data := jaeger.Trace{
+		TraceID:   jaeger.TraceID(roSpans[0].SpanContext().TraceID().String()),
+		Processes: make(map[jaeger.ProcessID]jaeger.Process),
+		Spans:     []jaeger.Span{},
+	}
+	for i := range roSpans {
+		ss := roSpans[i]
+		pid := jaeger.ProcessID(fmt.Sprintf("p%d", i))
+		data.Processes[pid] = jaeger.ResourceToProcess(ss.Resource(), defaultServiceName)
+		span := jaeger.ConvertSpan(ss)
+		span.Process = nil
+		span.ProcessID = pid
+		data.Spans = append(data.Spans, span)
+	}
+
+	return JaegerData{
+		Data: []jaeger.Trace{data},
+	}
+}