get trace info from context

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

go.sum

@@ -11,12 +11,8 @@ github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
 github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
-go.opentelemetry.io/otel v1.26.0 h1:LQwgL5s/1W7YiiRwxf03QGnWLb2HW4pLiAhaA5cZXBs=
-go.opentelemetry.io/otel v1.26.0/go.mod h1:UmLkJHUAidDval2EICqBMbnAd0/m2vmpf/dAM+fvFs4=
 go.opentelemetry.io/otel v1.28.0 h1:/SqNcYk+idO0CxKEUOtKQClMK/MimZihKYMruSMViUo=
 go.opentelemetry.io/otel v1.28.0/go.mod h1:q68ijF8Fc8CnMHKyzqL6akLO46ePnjkgfIMIjUIX9z4=
-go.unistack.org/micro/v3 v3.10.77 h1:nn731y84q3S8a4UgpVdC/wN9cs30ruZeH81rKw6XcUc=
-go.unistack.org/micro/v3 v3.10.77/go.mod h1:erMgt3Bl7vQQ0e9UpQyR5NlLiZ9pKeEJ9+1tfYFaqUg=
 go.unistack.org/micro/v3 v3.10.81 h1:zHttMUEwL/f9GtrNAQOk8bK0NrEwAuKeUW8DEoywgJI=
 go.unistack.org/micro/v3 v3.10.81/go.mod h1:erMgt3Bl7vQQ0e9UpQyR5NlLiZ9pKeEJ9+1tfYFaqUg=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=

opentracing.go

@@ -3,14 +3,13 @@ package opentracing
 import (
 	"context"
 	"errors"
-	"fmt"
+	"strings"
 
 	ot "github.com/opentracing/opentracing-go"
 	otlog "github.com/opentracing/opentracing-go/log"
 	"go.opentelemetry.io/otel/attribute"
 	"go.unistack.org/micro/v3/metadata"
 	"go.unistack.org/micro/v3/tracer"
-	rutil "go.unistack.org/micro/v3/util/reflect"
 )
 
 var _ tracer.Tracer = &otTracer{}
@@ -42,7 +41,12 @@ func (t *otTracer) Init(opts ...tracer.Option) error {
 	return nil
 }
 
-type spanContext interface {
+type otSpanContext interface {
+	TraceID() idStringer
+	SpanID() idStringer
+}
+
+type jSpanContext interface {
 	TraceID() idStringer
 	SpanID() idStringer
 }
@@ -73,18 +77,35 @@ func (t *otTracer) Start(ctx context.Context, name string, opts ...tracer.SpanOp
 	sp := &otSpan{span: span, opts: options}
 
 	spctx := span.Context()
-	if v, ok := spctx.(spanContext); ok {
-		sp.traceID = v.TraceID().String()
-		sp.spanID = v.SpanID().String()
+
+	var traceID, spanID, parentID string
+
+	if v, ok := spctx.(otSpanContext); ok {
+		traceID = v.TraceID().String()
+		spanID = v.SpanID().String()
 	} else {
-		if val, err := rutil.StructFieldByName(spctx, "TraceID"); err == nil {
-			sp.traceID = fmt.Sprintf("%v", val)
-		}
-		if val, err := rutil.StructFieldByName(spctx, "SpanID"); err == nil {
-			sp.spanID = fmt.Sprintf("%v", val)
+		carrier := make(map[string]string, 1)
+		_ = span.Tracer().Inject(spctx, ot.TextMap, ot.TextMapCarrier(carrier))
+		for k, v := range carrier {
+			switch k {
+			default: // reasonable default
+				p := strings.Split(v, ":")
+				traceID = p[0]
+				spanID = p[1]
+				parentID = p[2]
+			case "uber-trace-id": // jaeger trace span
+				p := strings.Split(v, ":")
+				traceID = p[0]
+				spanID = p[1]
+				parentID = p[2]
+			}
 		}
 	}
 
+	sp.traceID = traceID
+	sp.spanID = spanID
+	sp.parentID = parentID
+
 	return tracer.NewSpanContext(ctx, sp), sp
 }
 
@@ -100,6 +121,7 @@ type otSpan struct {
 	span      ot.Span
 	spanID    string
 	traceID   string
+	parentID  string
 	opts      tracer.SpanOptions
 	status    tracer.SpanStatus
 	statusMsg string

opentracing_test.go

@@ -6,11 +6,13 @@ import (
 	"testing"
 
 	"github.com/opentracing/opentracing-go/mocktracer"
+	// jconfig "github.com/uber/jaeger-client-go/config"
+	"go.unistack.org/micro/v3/logger/slog"
 	"go.unistack.org/micro/v3/metadata"
 	"go.unistack.org/micro/v3/tracer"
 )
 
-func TestTraceID(t *testing.T) {
+func TestNoopTraceID(t *testing.T) {
 	md := metadata.New(1)
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
@@ -30,8 +32,62 @@ func TestTraceID(t *testing.T) {
 	if v := sp.SpanID(); v != "44" {
 		t.Fatalf("invalid span span id %#+v", v)
 	}
+
+	l := slog.NewLogger()
+	if err := l.Init(); err != nil {
+		t.Fatal(err)
+	}
+	l.Info(ctx, "msg")
 }
 
+/*
+func TestRealTraceID(t *testing.T) {
+	md := metadata.New(1)
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	ctx = metadata.NewIncomingContext(ctx, md)
+
+	jcfg := &jconfig.Configuration{
+		ServiceName: "test",
+		Sampler: &jconfig.SamplerConfig{
+			Type:  "const",
+			Param: 1,
+		},
+		Reporter: &jconfig.ReporterConfig{
+			LogSpans:  true,
+			QueueSize: 100,
+		},
+	}
+
+	jtr, closer, err := jcfg.NewTracer()
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer closer.Close()
+
+	tr := NewTracer(Tracer(jtr))
+	if err := tr.Init(); err != nil {
+		t.Fatal(err)
+	}
+
+	var sp tracer.Span
+
+	ctx, sp = tr.Start(ctx, "test")
+	if v := sp.TraceID(); v != "43" {
+		t.Fatalf("invalid span trace id %#+v", v)
+	}
+	if v := sp.SpanID(); v != "44" {
+		t.Fatalf("invalid span span id %#+v", v)
+	}
+
+	l := slog.NewLogger()
+	if err := l.Init(); err != nil {
+		t.Fatal(err)
+	}
+	l.Info(ctx, "msg")
+}
+*
+
 func TestTraceTags(t *testing.T) {
 	md := metadata.New(1)
 	ctx, cancel := context.WithCancel(context.Background())