fixup finish

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

.github/workflows/build.yml

@@ -34,7 +34,7 @@ jobs:
       - name: checkout
         uses: actions/checkout@v3
       - name: lint
-        uses: golangci/golangci-lint-action@v3.3.1
+        uses: golangci/golangci-lint-action@v3.4.0
         continue-on-error: true
         with:
           # Required: the version of golangci-lint is required and must be specified without patch version: we always use the latest patch version.

.github/workflows/dependabot-automerge.yml

@@ -15,7 +15,7 @@ jobs:
     steps:
       - name: metadata
         id: metadata
-        uses: dependabot/fetch-metadata@v1.3.5
+        uses: dependabot/fetch-metadata@v1.3.6
         with:
           github-token: "${{ secrets.TOKEN }}"
       - name: merge

.github/workflows/pr.yml

@@ -34,7 +34,7 @@ jobs:
       - name: checkout
         uses: actions/checkout@v3
       - name: lint
-        uses: golangci/golangci-lint-action@v3.3.1
+        uses: golangci/golangci-lint-action@v3.4.0
         continue-on-error: true
         with:
           # Required: the version of golangci-lint is required and must be specified without patch version: we always use the latest patch version.

go.mod

@@ -1,9 +1,9 @@
 module go.unistack.org/micro-tracer-opentracing/v3
 
-go 1.16
+go 1.20
 
 require (
 	github.com/opentracing/opentracing-go v1.2.0
-	go.unistack.org/micro/v3 v3.10.0
+	go.opentelemetry.io/otel v1.24.0
-	gopkg.in/yaml.v2 v2.4.0 // indirect
+	go.unistack.org/micro/v3 v3.10.43
 )

go.sum

@@ -1,156 +1,15 @@
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-golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
-golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
-golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3HoIrodX9oNMXvdceNzlUR8zjMvY=
-golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
-golang.org/x/tools v0.0.0-20190524140312-2c0ae7006135/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
-golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
-google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
-google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
-google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
-google.golang.org/genproto v0.0.0-20200513103714-09dca8ec2884/go.mod h1:55QSHmfGQM9UVYDPBsyGGes0y52j32PQ3BqQfXhyH3c=
-google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013/go.mod h1:NbSheEEYHJ7i3ixzK3sjbqSGDJWnxyFXZblF3eUsNvo=
-google.golang.org/genproto v0.0.0-20220107163113-42d7afdf6368/go.mod h1:5CzLGKJ67TSI2B9POpiiyGha0AjJvZIUgRMt1dSmuhc=
-google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
-google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
-google.golang.org/grpc v1.25.1/go.mod h1:c3i+UQWmh7LiEpx4sFZnkU36qjEYZ0imhYfXVyQciAY=
-google.golang.org/grpc v1.27.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
-google.golang.org/grpc v1.33.1/go.mod h1:fr5YgcSWrqhRRxogOsw7RzIpsmvOZ6IcH4kBYTpR3n0=
-google.golang.org/grpc v1.36.0/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU=
-google.golang.org/grpc v1.40.0/go.mod h1:ogyxbiOoUXAkP+4+xa6PZSE9DZgIHtSpzjDTB9KAK34=
-google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
-google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
-google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
-google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
-google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
-google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
-google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
-google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
-google.golang.org/protobuf v1.27.1/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
-google.golang.org/protobuf v1.28.1/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
-gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
-gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-gopkg.in/yaml.v3 v3.0.0/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=

opentracing.go

@@ -2,146 +2,323 @@ package opentracing
 
 import (
 	"context"
+	"errors"
+	"fmt"
 
-	"github.com/opentracing/opentracing-go"
+	ot "github.com/opentracing/opentracing-go"
-	"github.com/opentracing/opentracing-go/log"
+	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 = &opentracingTracer{}
+var _ tracer.Tracer = &otTracer{}
 
-type opentracingTracer struct {
+type otTracer struct {
 	opts   tracer.Options
-	tracer opentracing.Tracer
+	tracer ot.Tracer
 }
 
-func (ot *opentracingTracer) Name() string {
+func (t *otTracer) Name() string {
-	return ot.opts.Name
+	return t.opts.Name
 }
 
-func (ot *opentracingTracer) Init(opts ...tracer.Option) error {
+func (t *otTracer) Flush(ctx context.Context) error {
-	ot.opts = tracer.NewOptions(opts...)
 	return nil
 }
 
-func (ot *opentracingTracer) Start(ctx context.Context, name string, opts ...tracer.SpanOption) (context.Context, tracer.Span) {
+func (t *otTracer) Init(opts ...tracer.Option) error {
-	ctx, span, _ := StartSpanFromIncomingContext(ctx, ot.tracer, name)
+	for _, o := range opts {
-	return ctx, &opentracingSpan{span: span}
+		o(&t.opts)
 	}
 
-type opentracingSpan struct {
+	if tr, ok := t.opts.Context.Value(tracerKey{}).(ot.Tracer); ok {
-	span   opentracing.Span
+		t.tracer = tr
-	labels []interface{}
+	} else {
+		return errors.New("Tracer option missing")
 	}
 
-func (os *opentracingSpan) Tracer() tracer.Tracer {
+	return nil
-	return &opentracingTracer{tracer: os.span.Tracer()}
 }
 
-func (os *opentracingSpan) Finish(opts ...tracer.SpanOption) {
+type spanContext interface {
-	if len(os.labels) > 0 {
+	TraceID() idStringer
-		os.span.LogKV(os.labels...)
+	SpanID() idStringer
 }
+
+func (t *otTracer) Start(ctx context.Context, name string, opts ...tracer.SpanOption) (context.Context, tracer.Span) {
+	options := tracer.NewSpanOptions(opts...)
+	var span ot.Span
+	switch options.Kind {
+	case tracer.SpanKindUnspecified:
+		ctx, span = t.startSpanFromAny(ctx, name)
+	case tracer.SpanKindInternal:
+		ctx, span = t.startSpanFromContext(ctx, name)
+	case tracer.SpanKindClient, tracer.SpanKindProducer:
+		ctx, span = t.startSpanFromOutgoingContext(ctx, name)
+	case tracer.SpanKindServer, tracer.SpanKindConsumer:
+		ctx, span = t.startSpanFromIncomingContext(ctx, name)
+	}
+
+	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()
+	} 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)
+		}
+	}
+
+	return tracer.NewSpanContext(ctx, sp), sp
+}
+
+type idStringer struct {
+	s string
+}
+
+func (s idStringer) String() string {
+	return s.s
+}
+
+type otSpan struct {
+	span      ot.Span
+	spanID    string
+	traceID   string
+	opts      tracer.SpanOptions
+	status    tracer.SpanStatus
+	statusMsg string
+}
+
+func (os *otSpan) TraceID() string {
+	return os.traceID
+}
+
+func (os *otSpan) SpanID() string {
+	return os.spanID
+}
+
+func (os *otSpan) SetStatus(st tracer.SpanStatus, msg string) {
+	os.status = st
+	os.statusMsg = msg
+}
+
+func (os *otSpan) Status() (tracer.SpanStatus, string) {
+	return os.status, os.statusMsg
+}
+
+func (os *otSpan) Tracer() tracer.Tracer {
+	return &otTracer{tracer: os.span.Tracer()}
+}
+
+func (os *otSpan) Finish(opts ...tracer.SpanOption) {
+	options := os.opts
+	for _, o := range opts {
+		o(&options)
+	}
+
+	l := len(options.Labels)
+	for idx := 0; idx < len(options.Labels); idx++ {
+		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, options.Labels[idx+1])
+				idx++
+			}
+		}
+	}
+
+	if os.status == tracer.SpanStatusError {
+		os.span.SetTag("error", true)
+		os.span.LogKV("error", os.statusMsg)
+	}
+	os.span.SetTag("span.kind", options.Kind)
 	os.span.Finish()
 }
 
-func (os *opentracingSpan) AddEvent(name string, opts ...tracer.EventOption) {
+func (os *otSpan) AddEvent(name string, opts ...tracer.EventOption) {
-	os.span.LogFields(log.Event(name))
+	os.span.LogFields(otlog.Event(name))
 }
 
-func (os *opentracingSpan) Context() context.Context {
+func (os *otSpan) AddLogs(kv ...interface{}) {
-	return tracer.NewSpanContext(context.Background(), os)
+	os.span.LogKV(kv...)
 }
 
-func (os *opentracingSpan) SetName(name string) {
+func (os *otSpan) Context() context.Context {
+	return ot.ContextWithSpan(context.Background(), os.span)
+}
+
+func (os *otSpan) SetName(name string) {
 	os.span = os.span.SetOperationName(name)
 }
 
-func (os *opentracingSpan) SetLabels(labels ...interface{}) {
+func (os *otSpan) SetLabels(labels ...interface{}) {
-	os.labels = labels
+	os.opts.Labels = labels
 }
 
-func (os *opentracingSpan) AddLabels(labels ...interface{}) {
+func (os *otSpan) Kind() tracer.SpanKind {
-	os.labels = append(os.labels, labels...)
+	return os.opts.Kind
 }
 
-func NewTracer(opts ...tracer.Option) *opentracingTracer {
+func (os *otSpan) AddLabels(labels ...interface{}) {
+	l := len(labels)
+	for idx := 0; idx < len(labels); idx++ {
+		switch lt := 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])
+				idx++
+			}
+		}
+	}
+}
+
+func NewTracer(opts ...tracer.Option) *otTracer {
 	options := tracer.NewOptions(opts...)
-	return &opentracingTracer{opts: options}
+	return &otTracer{opts: options}
 }
 
-func spanFromContext(ctx context.Context) opentracing.Span {
+func (t *otTracer) startSpanFromAny(ctx context.Context, name string, opts ...ot.StartSpanOption) (context.Context, ot.Span) {
-	return opentracing.SpanFromContext(ctx)
+	if tracerSpan, ok := tracer.SpanFromContext(ctx); ok && tracerSpan != nil {
+		return t.startSpanFromContext(ctx, name, opts...)
 	}
 
-// StartSpanFromOutgoingContext returns a new span with the given operation name and options. If a span
+	if otSpan := ot.SpanFromContext(ctx); otSpan != nil {
-// is found in the context, it will be used as the parent of the resulting span.
+		return t.startSpanFromContext(ctx, name, opts...)
-func StartSpanFromOutgoingContext(ctx context.Context, tracer opentracing.Tracer, name string, opts ...opentracing.StartSpanOption) (context.Context, opentracing.Span, error) {
+	}
-	var parentCtx opentracing.SpanContext
 
-	md, ok := metadata.FromIncomingContext(ctx)
+	if md, ok := metadata.FromIncomingContext(ctx); ok && md != nil {
-	// Find parent span.
+		return t.startSpanFromIncomingContext(ctx, name, opts...)
-	if parentSpan := opentracing.SpanFromContext(ctx); parentSpan != nil {
+	}
-		// First try to get span within current service boundary.
+
-		parentCtx = parentSpan.Context()
+	if md, ok := metadata.FromOutgoingContext(ctx); ok && md != nil {
-	} else if spanCtx, err := tracer.Extract(opentracing.TextMap, opentracing.TextMapCarrier(md)); err == nil && ok {
+		return t.startSpanFromOutgoingContext(ctx, name, opts...)
-		// If there doesn't exist, try to get it from metadata(which is cross boundary)
+	}
+
+	return t.startSpanFromContext(ctx, name, opts...)
+}
+
+func (t *otTracer) startSpanFromContext(ctx context.Context, name string, opts ...ot.StartSpanOption) (context.Context, ot.Span) {
+	var parentSpan ot.Span
+	if tracerSpan, ok := tracer.SpanFromContext(ctx); ok && tracerSpan != nil {
+		if sp, ok := tracerSpan.(*otSpan); ok {
+			parentSpan = sp.span
+		}
+	}
+	if parentSpan == nil {
+		if otSpan := ot.SpanFromContext(ctx); otSpan != nil {
+			parentSpan = otSpan
+		}
+	}
+
+	if parentSpan != nil {
+		opts = append(opts, ot.ChildOf(parentSpan.Context()))
+	}
+
+	md := metadata.New(1)
+
+	sp := t.tracer.StartSpan(name, opts...)
+	if err := sp.Tracer().Inject(sp.Context(), ot.TextMap, ot.TextMapCarrier(md)); err != nil {
+		return nil, nil
+	}
+
+	ctx = ot.ContextWithSpan(ctx, sp)
+
+	return ctx, sp
+}
+
+func (t *otTracer) startSpanFromOutgoingContext(ctx context.Context, name string, opts ...ot.StartSpanOption) (context.Context, ot.Span) {
+	var parentSpan ot.Span
+	if tracerSpan, ok := tracer.SpanFromContext(ctx); ok && tracerSpan != nil {
+		if sp, ok := tracerSpan.(*otSpan); ok {
+			parentSpan = sp.span
+		}
+	}
+	if parentSpan == nil {
+		if otSpan := ot.SpanFromContext(ctx); otSpan != nil {
+			parentSpan = otSpan
+		}
+	}
+
+	md, ok := metadata.FromOutgoingContext(ctx)
+
+	if parentSpan != nil {
+		opts = append(opts, ot.ChildOf(parentSpan.Context()))
+	} else {
+		var parentCtx ot.SpanContext
+
+		if ok && md != nil {
+			if spanCtx, err := t.tracer.Extract(ot.TextMap, ot.TextMapCarrier(md)); err == nil && ok {
 				parentCtx = spanCtx
 			}
+		}
 
 		if parentCtx != nil {
-		opts = append(opts, opentracing.ChildOf(parentCtx))
+			opts = append(opts, ot.ChildOf(parentCtx))
+		}
 	}
 
 	nmd := metadata.Copy(md)
 
-	sp := tracer.StartSpan(name, opts...)
+	sp := t.tracer.StartSpan(name, opts...)
-	if err := sp.Tracer().Inject(sp.Context(), opentracing.TextMap, opentracing.TextMapCarrier(nmd)); err != nil {
+	if err := sp.Tracer().Inject(sp.Context(), ot.TextMap, ot.TextMapCarrier(nmd)); err != nil {
-		return nil, nil, err
+		return nil, nil
 	}
 
-	ctx = metadata.NewOutgoingContext(opentracing.ContextWithSpan(ctx, sp), nmd)
+	ctx = metadata.NewOutgoingContext(ot.ContextWithSpan(ctx, sp), nmd)
 
-	return ctx, sp, nil
+	return ctx, sp
 }
 
-// StartSpanFromIncomingContext returns a new span with the given operation name and options. If a span
+func (t *otTracer) startSpanFromIncomingContext(ctx context.Context, name string, opts ...ot.StartSpanOption) (context.Context, ot.Span) {
-// is found in the context, it will be used as the parent of the resulting span.
+	var parentSpan ot.Span
-func StartSpanFromIncomingContext(ctx context.Context, tracer opentracing.Tracer, name string, opts ...opentracing.StartSpanOption) (context.Context, opentracing.Span, error) {
+	if tracerSpan, ok := tracer.SpanFromContext(ctx); ok && tracerSpan != nil {
-	var parentCtx opentracing.SpanContext
+		if sp, ok := tracerSpan.(*otSpan); ok {
+			parentSpan = sp.span
+		}
+	}
+	if parentSpan == nil {
+		if otSpan := ot.SpanFromContext(ctx); otSpan != nil {
+			parentSpan = otSpan
+		}
+	}
 
-	// Find parent span.
 	md, ok := metadata.FromIncomingContext(ctx)
-	if parentSpan := opentracing.SpanFromContext(ctx); parentSpan != nil {
+
-		// First try to get span within current service boundary.
+	if parentSpan != nil {
-		parentCtx = parentSpan.Context()
+		opts = append(opts, ot.ChildOf(parentSpan.Context()))
-	} else if spanCtx, err := tracer.Extract(opentracing.TextMap, opentracing.TextMapCarrier(md)); err == nil && ok {
+	} else {
-		// If there doesn't exist, try to get it from metadata(which is cross boundary)
+		var parentCtx ot.SpanContext
+
+		if ok && md != nil {
+			if spanCtx, err := t.tracer.Extract(ot.TextMap, ot.TextMapCarrier(md)); err == nil {
 				parentCtx = spanCtx
 			}
+		}
 
 		if parentCtx != nil {
-		opts = append(opts, opentracing.ChildOf(parentCtx))
+			opts = append(opts, ot.ChildOf(parentCtx))
+		}
 	}
 
-	var nmd metadata.Metadata
+	nmd := metadata.Copy(md)
-	if ok {
+
-		nmd = metadata.New(len(md))
+	sp := t.tracer.StartSpan(name, opts...)
-	} else {
+	if err := sp.Tracer().Inject(sp.Context(), ot.TextMap, ot.TextMapCarrier(nmd)); err != nil {
-		nmd = metadata.New(0)
+		return nil, nil
 	}
 
-	sp := tracer.StartSpan(name, opts...)
+	ctx = metadata.NewIncomingContext(ot.ContextWithSpan(ctx, sp), nmd)
-	if err := sp.Tracer().Inject(sp.Context(), opentracing.TextMap, opentracing.TextMapCarrier(nmd)); err != nil {
-		return nil, nil, err
-	}
 
-	for k, v := range md {
+	return ctx, sp
-		nmd.Set(k, v)
-	}
-
-	ctx = metadata.NewIncomingContext(opentracing.ContextWithSpan(ctx, sp), nmd)
-
-	return ctx, sp, nil
 }

opentracing_test.go

@@ -2,49 +2,31 @@ package opentracing
 
 import (
 	"context"
-	"sync"
 	"testing"
 
-	opentracing "github.com/opentracing/opentracing-go"
+	"github.com/opentracing/opentracing-go/mocktracer"
 	"go.unistack.org/micro/v3/metadata"
+	"go.unistack.org/micro/v3/tracer"
 )
 
-func TestStartSpanFromIncomingContext(t *testing.T) {
+func TestTraceID(t *testing.T) {
-	md := metadata.New(2)
+	md := metadata.New(1)
-	md.Set("key", "val")
-
-	var g sync.WaitGroup
-
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
 	ctx = metadata.NewIncomingContext(ctx, md)
 
-	tracer := opentracing.GlobalTracer()
+	tr := NewTracer(Tracer(mocktracer.New()))
-
+	if err := tr.Init(); err != nil {
-	g.Add(8000)
-	cherr := make(chan error)
-	for i := 0; i < 8000; i++ {
-		go func() {
-			defer g.Done()
-			_, sp, err := StartSpanFromIncomingContext(ctx, tracer, "test")
-			if err != nil {
-				cherr <- err
-			}
-			sp.Finish()
-		}()
-	}
-
-	for {
-		select {
-		default:
-			g.Wait()
-			close(cherr)
-		case err, ok := <-cherr:
-			if err != nil {
 		t.Fatal(err)
-			} else if !ok {
+	}
-				return
+
-			}
+	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)
 	}
 }

options.go

@@ -0,0 +1,12 @@
+package opentracing
+
+import (
+	"github.com/opentracing/opentracing-go"
+	"go.unistack.org/micro/v3/tracer"
+)
+
+type tracerKey struct{}
+
+func Tracer(ot opentracing.Tracer) tracer.Option {
+	return tracer.SetOption(tracerKey{}, ot)
+}