get trace info from context

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

go.mod

@@ -6,6 +6,6 @@ toolchain go1.22.2
 
 require (
 	github.com/opentracing/opentracing-go v1.2.0
-	go.opentelemetry.io/otel v1.26.0
-	go.unistack.org/micro/v3 v3.10.73
+	go.opentelemetry.io/otel v1.28.0
+	go.unistack.org/micro/v3 v3.10.81
 )

go.sum

@@ -11,9 +11,9 @@ 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.unistack.org/micro/v3 v3.10.73 h1:C8z8SBGDWWB0lemExr/P6WAbMFD4L1w6rpf61OU/RmY=
-go.unistack.org/micro/v3 v3.10.73/go.mod h1:erMgt3Bl7vQQ0e9UpQyR5NlLiZ9pKeEJ9+1tfYFaqUg=
+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 v3.10.81 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=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

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{}
@@ -42,13 +41,27 @@ 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
 }
 
 func (t *otTracer) Start(ctx context.Context, name string, opts ...tracer.SpanOption) (context.Context, tracer.Span) {
 	options := tracer.NewSpanOptions(opts...)
+
+	if len(options.Labels)%2 != 0 {
+		options.Labels = options.Labels[:len(options.Labels)-1]
+	}
+
+	for _, fn := range t.opts.ContextAttrFuncs {
+		options.Labels = append(options.Labels, fn(ctx)...)
+	}
+
 	var span ot.Span
 	switch options.Kind {
 	case tracer.SpanKindUnspecified:
@@ -64,17 +77,40 @@ 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 {
+			case "mockpfx-ids-sampled":
+				continue
+			case "mockpfx-ids-spanid":
+				spanID = v
+			case "mockpfx-ids-traceid":
+				traceID = v
+			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
 }
@@ -91,10 +127,12 @@ type otSpan struct {
 	span      ot.Span
 	spanID    string
 	traceID   string
+	parentID  string
 	opts      tracer.SpanOptions
 	status    tracer.SpanStatus
 	statusMsg string
 	labels    []interface{}
+	finished  bool
 }
 
 func (os *otSpan) TraceID() string {
@@ -105,6 +143,10 @@ func (os *otSpan) SpanID() string {
 	return os.spanID
 }
 
+func (os *otSpan) ParentID() string {
+	return os.parentID
+}
+
 func (os *otSpan) SetStatus(st tracer.SpanStatus, msg string) {
 	os.status = st
 	os.statusMsg = msg
@@ -119,7 +161,16 @@ func (os *otSpan) Tracer() tracer.Tracer {
 }
 
 func (os *otSpan) Finish(opts ...tracer.SpanOption) {
+	if os.finished {
+		return
+	}
+
 	options := os.opts
+
+	options.Status = os.status
+	options.StatusMsg = os.statusMsg
+	options.Labels = append(options.Labels, os.labels...)
+
 	for _, o := range opts {
 		o(&options)
 	}
@@ -128,26 +179,32 @@ func (os *otSpan) Finish(opts ...tracer.SpanOption) {
 		return
 	}
 
-	labels := append(options.Labels, os.labels...)
-	l := len(labels)
+	if len(options.Labels)%2 != 0 {
+		options.Labels = options.Labels[:len(options.Labels)-1]
+	}
+
+	l := len(options.Labels)
 	for idx := 0; idx < l; idx++ {
-		switch lt := labels[idx].(type) {
+		switch lt := options.Labels[idx].(type) {
 		case attribute.KeyValue:
 			os.span.SetTag(string(lt.Key), lt.Value.AsInterface())
 		case string:
 			if l > idx+1 {
-				os.span.SetTag(lt, labels[idx+1])
+				os.span.SetTag(lt, options.Labels[idx+1])
 				idx++
 			}
 		}
 	}
 
-	if os.status == tracer.SpanStatusError {
+	if options.Status == tracer.SpanStatusError {
 		os.span.SetTag("error", true)
-		os.span.LogKV("error", os.statusMsg)
+		os.span.LogKV("error", options.StatusMsg)
 	}
+
 	os.span.SetTag("span.kind", options.Kind)
 	os.span.Finish()
+
+	os.finished = true
 }
 
 func (os *otSpan) AddEvent(name string, opts ...tracer.EventOption) {

opentracing_test.go

@@ -2,14 +2,17 @@ package opentracing
 
 import (
 	"context"
+	"fmt"
 	"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()
@@ -29,7 +32,61 @@ 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)
@@ -46,8 +103,15 @@ func TestTraceTags(t *testing.T) {
 	var sp tracer.Span
 
 	ctx, sp = tr.Start(ctx, "test", tracer.WithSpanLabels("key", "val", "odd"))
-	sp.Finish()
-
+	sp.Finish(tracer.WithSpanLabels("xkey", "xval"))
+	_ = ctx
 	msp := mtr.FinishedSpans()[0]
-	t.Logf("mock span %#+v", msp.Tags())
+
+	if "val" != fmt.Sprintf("%v", msp.Tags()["key"]) {
+		t.Fatal("mock span invalid")
+	}
+
+	if "xval" != fmt.Sprintf("%v", msp.Tags()["xkey"]) {
+		t.Fatalf("mock span invalid %#+v", msp)
+	}
 }