fix: retrieve lost code due to merge. test: support for ot.HTTPHeaders

bridge/opentracing/bridge.go

@@ -635,7 +635,7 @@ func (s fakeSpan) SpanContext() trace.SpanContext {
 // Inject is a part of the implementation of the OpenTracing Tracer
 // interface.
 //
-// Currently only the HTTPHeaders format is supported.
+// Currently only the HTTPHeaders and TextMap format are supported.
 func (t *BridgeTracer) Inject(sm ot.SpanContext, format interface{}, carrier interface{}) error {
 	bridgeSC, ok := sm.(*bridgeSpanContext)
 	if !ok {
@@ -644,28 +644,47 @@ func (t *BridgeTracer) Inject(sm ot.SpanContext, format interface{}, carrier int
 	if !bridgeSC.otelSpanContext.IsValid() {
 		return ot.ErrInvalidSpanContext
 	}
-	if builtinFormat, ok := format.(ot.BuiltinFormat); !ok || builtinFormat != ot.HTTPHeaders {
+
+	builtinFormat, ok := format.(ot.BuiltinFormat)
+	if !ok {
 		return ot.ErrUnsupportedFormat
 	}
-	hhcarrier, ok := carrier.(ot.HTTPHeadersCarrier)
-	if !ok {
-		return ot.ErrInvalidCarrier
+
+	var textCarrier propagation.TextMapCarrier
+
+	switch builtinFormat {
+	case ot.HTTPHeaders:
+		hhcarrier, ok := carrier.(ot.HTTPHeadersCarrier)
+		if !ok {
+			return ot.ErrInvalidCarrier
+		}
+
+		textCarrier = propagation.HeaderCarrier(hhcarrier)
+	case ot.TextMap:
+		if textCarrier, ok = carrier.(propagation.TextMapCarrier); !ok {
+			var err error
+			if textCarrier, err = newTextMapWrapperForInject(carrier); err != nil {
+				return err
+			}
+		}
+	default:
+		return ot.ErrUnsupportedFormat
 	}
-	header := http.Header(hhcarrier)
+
 	fs := fakeSpan{
 		Span: noopSpan,
 		sc:   bridgeSC.otelSpanContext,
 	}
 	ctx := trace.ContextWithSpan(context.Background(), fs)
 	ctx = baggage.ContextWithBaggage(ctx, bridgeSC.bag)
-	t.getPropagator().Inject(ctx, propagation.HeaderCarrier(header))
+	t.getPropagator().Inject(ctx, textCarrier)
 	return nil
 }
 
 // Extract is a part of the implementation of the OpenTracing Tracer
 // interface.
 //
-// Currently only the HTTPHeaders format is supported.
+// Currently only the HTTPHeaders and TextMap format are supported.
 func (t *BridgeTracer) Extract(format interface{}, carrier interface{}) (ot.SpanContext, error) {
 	builtinFormat, ok := format.(ot.BuiltinFormat)
 	if !ok {

bridge/opentracing/bridge_test.go

@@ -7,6 +7,7 @@ import (
 	"github.com/stretchr/testify/assert"
 	"go.opentelemetry.io/otel/propagation"
 	"go.opentelemetry.io/otel/trace"
+	"net/http"
 	"strings"
 	"testing"
 )
@@ -181,29 +182,6 @@ func (t *textMapCarrier) Keys() []string {
 	return str
 }
 
-// opentracingTextMap  Implemented opentracing.TextMapReader and opentracing.TextMapWriter interface
-type opentracingTextMapCarrier struct {
-	m map[string]string
-}
-
-func newOpentracingTextMapCarrier() *opentracingTextMapCarrier {
-	return &opentracingTextMapCarrier{m: map[string]string{}}
-}
-
-func (o *opentracingTextMapCarrier) Set(key, val string) {
-	o.m[key] = val
-}
-
-func (o *opentracingTextMapCarrier) ForeachKey(handler func(key string, val string) error) error {
-	for key, val := range o.m {
-		if err := handler(key, val); err != nil {
-			return err
-		}
-	}
-
-	return nil
-}
-
 // testTextMapReader only implemented opentracing.TextMapReader interface
 type testTextMapReader struct {
 	m *map[string]string
@@ -241,8 +219,9 @@ func TestBridgeTracer_ExtractAndInject(t *testing.T) {
 	bridge.SetTextMapPropagator(new(testTextMapPropagator))
 
 	tmc := newTextCarrier()
-	otmc := newOpentracingTextMapCarrier()
 	shareMap := map[string]string{}
+	otTextMap := ot.TextMapCarrier{}
+	httpHeader := ot.HTTPHeadersCarrier(http.Header{})
 
 	testCases := []struct {
 		name           string
@@ -259,8 +238,14 @@ func TestBridgeTracer_ExtractAndInject(t *testing.T) {
 		{
 			name:           "support for opentracing.TextMapReader and opentracing.TextMapWriter",
 			carrierType:    ot.TextMap,
-			extractCarrier: otmc,
-			injectCarrier:  otmc,
+			extractCarrier: otTextMap,
+			injectCarrier:  otTextMap,
+		},
+		{
+			name:           "support for HTTPHeaders",
+			carrierType:    ot.HTTPHeaders,
+			extractCarrier: httpHeader,
+			injectCarrier:  httpHeader,
 		},
 		{
 			name:           "support for opentracing.TextMapReader and opentracing.TextMapWriter,non-same instance",