add trace to handler

debug/service/handler/debug.go

@@ -8,6 +8,7 @@ import (
 	"github.com/micro/go-micro/debug/log"
 	proto "github.com/micro/go-micro/debug/service/proto"
 	"github.com/micro/go-micro/debug/stats"
+	"github.com/micro/go-micro/debug/trace"
 	"github.com/micro/go-micro/server"
 )
 
@@ -23,6 +24,8 @@ type Debug struct {
 	log log.Log
 	// the stats collector
 	stats stats.Stats
+	// the tracer
+	trace trace.Trace
 }
 
 func newDebug() *Debug {
@@ -60,6 +63,27 @@ func (d *Debug) Stats(ctx context.Context, req *proto.StatsRequest, rsp *proto.S
 	return nil
 }
 
+func (d *Debug) Trace(ctx context.Context, req *proto.TraceRequest, rsp *proto.TraceResponse) error {
+	traces, err := d.trace.Read(trace.ReadTrace(req.Id))
+	if err != nil {
+		return err
+	}
+
+	for _, trace := range traces {
+		rsp.Spans = append(rsp.Spans, &proto.Span{
+			Trace:    trace.Trace,
+			Id:       trace.Id,
+			Parent:   trace.Parent,
+			Name:     trace.Name,
+			Started:  uint64(trace.Started.UnixNano()),
+			Duration: uint64(trace.Duration.Nanoseconds()),
+			Metadata: trace.Metadata,
+		})
+	}
+
+	return nil
+}
+
 func (d *Debug) Log(ctx context.Context, stream server.Stream) error {
 	req := new(proto.LogRequest)
 	if err := stream.Recv(req); err != nil {