Repository: GoogleCloudPlatform/opentelemetry-operations-go
Pull request #177 (2021-07-01 20:57:53)

Add an end-to-end test server.
BUG=191643395

~~DO NOT SUBMIT until we have resolved blocking bugs:~~
- ~~b/192584837 Extrenuous labels from go exporter~~
- ~~b/192584818 Span kind is not set in go exporter~~

jsuereth: @tbarker25 Looks like test failures are the e2e test server go.mod being out of date when running codecoverage.  Would you mind taking a look or bumping the dependencies?

Patch:
diff --git a/exporter/trace/cloudtrace.go b/exporter/trace/cloudtrace.go
index 2e95360..8c273b2 100644
--- a/exporter/trace/cloudtrace.go
+++ b/exporter/trace/cloudtrace.go
@@ -37,7 +37,7 @@ type Option func(*options)
 
 // DisplayNameFormatter is is a function that produces the display name of a span
 // given its ReadOnlySpan
-type DisplayNameFormatter func(sdktrace.ReadOnlySpan) string
+type DisplayNameFormatter func(ReadOnlySpan) string
 
 // options contains options for configuring the exporter.
 type options struct {
@@ -245,6 +245,14 @@ func newContextWithTimeout(ctx context.Context, timeout time.Duration) (context.
 
 // ExportSpans exports a ReadOnlySpan to Stackdriver Trace.
 func (e *Exporter) ExportSpans(ctx context.Context, spanData []sdktrace.ReadOnlySpan) error {
+	sd := make([]ReadOnlySpan, len(spanData))
+	for i := range spanData {
+		sd[i] = spanData[i]
+	}
+	return e.traceExporter.ExportSpans(ctx, sd)
+}
+
+func (e *Exporter) ExportCustomSpans(ctx context.Context, spanData []ReadOnlySpan) error {
 	return e.traceExporter.ExportSpans(ctx, spanData)
 }
 
diff --git a/exporter/trace/readonlyspan.go b/exporter/trace/readonlyspan.go
new file mode 100644
index 0000000..635a252
--- /dev/null
+++ b/exporter/trace/readonlyspan.go
@@ -0,0 +1,51 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package trace
+
+import (
+	"time"
+
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/sdk/instrumentation"
+	"go.opentelemetry.io/otel/sdk/resource"
+	sdktrace "go.opentelemetry.io/otel/sdk/trace"
+	"go.opentelemetry.io/otel/trace"
+)
+
+// ReadOnlySpan is a copy of sdktrace.ReadOnlySpan without the private func.
+// It exists so that callers outside the Go SDK (such as the OTel collector exporter)
+// can create their own ReadOnlySpan instances, while retaining compatibility with
+// the Go exporter API.
+type ReadOnlySpan interface {
+	Name() string
+	SpanContext() trace.SpanContext
+	Parent() trace.SpanContext
+	SpanKind() trace.SpanKind
+	StartTime() time.Time
+	EndTime() time.Time
+	Attributes() []attribute.KeyValue
+	Links() []trace.Link
+	Events() []sdktrace.Event
+	Status() sdktrace.Status
+	InstrumentationLibrary() instrumentation.Library
+	Resource() *resource.Resource
+	DroppedAttributes() int
+	DroppedLinks() int
+	DroppedEvents() int
+	ChildSpanCount() int
+}
+
+// Ensure that our notion of ReadOnlySpan remains compatible with the SDK's.
+var _ ReadOnlySpan = sdktrace.ReadOnlySpan(nil)
diff --git a/exporter/trace/trace.go b/exporter/trace/trace.go
index 4b5acc2..26e68dc 100644
--- a/exporter/trace/trace.go
+++ b/exporter/trace/trace.go
@@ -20,8 +20,6 @@ import (
 	"fmt"
 	"time"
 
-	sdktrace "go.opentelemetry.io/otel/sdk/trace"
-
 	traceclient "cloud.google.com/go/trace/apiv2"
 	"google.golang.org/api/option"
 	tracepb "google.golang.org/genproto/googleapis/devtools/cloudtrace/v2"
@@ -54,7 +52,7 @@ func newTraceExporter(o *options) (*traceExporter, error) {
 	return e, nil
 }
 
-func (e *traceExporter) ExportSpans(ctx context.Context, spanData []sdktrace.ReadOnlySpan) error {
+func (e *traceExporter) ExportSpans(ctx context.Context, spanData []ReadOnlySpan) error {
 	// Ship the whole bundle o data.
 	results := make([]*tracepb.Span, len(spanData))
 	for i, sd := range spanData {
@@ -64,7 +62,7 @@ func (e *traceExporter) ExportSpans(ctx context.Context, spanData []sdktrace.Rea
 }
 
 // ConvertSpan converts a ReadOnlySpan to Stackdriver Trace.
-func (e *traceExporter) ConvertSpan(_ context.Context, sd sdktrace.ReadOnlySpan) *tracepb.Span {
+func (e *traceExporter) ConvertSpan(_ context.Context, sd ReadOnlySpan) *tracepb.Span {
 	return protoFromReadOnlySpan(sd, e.o.DefaultTraceAttributes, e.projectID, e.o.DisplayNameFormatter)
 }
 
diff --git a/exporter/trace/trace_proto.go b/exporter/trace/trace_proto.go
index a9bddbf..3d44979 100644
--- a/exporter/trace/trace_proto.go
+++ b/exporter/trace/trace_proto.go
@@ -25,7 +25,7 @@ import (
 	"go.opentelemetry.io/otel"
 	"go.opentelemetry.io/otel/attribute"
 	"go.opentelemetry.io/otel/codes"
-	sdktrace "go.opentelemetry.io/otel/sdk/trace"
+	"go.opentelemetry.io/otel/trace"
 
 	timestamppb "github.com/golang/protobuf/ptypes/timestamp"
 	wrapperspb "github.com/golang/protobuf/ptypes/wrappers"
@@ -39,6 +39,7 @@ const (
 	// TODO(ymotongpoo): uncomment this after gRPC trace get supported.
 	// maxMessageEventsPerSpan    = 128
 	maxAttributeStringValue = 256
+	maxNumLinks             = 128
 	agentLabel              = "g.co/agent"
 
 	// Attributes recorded on the span for the requests.
@@ -63,7 +64,7 @@ const (
 
 var userAgent = fmt.Sprintf("opentelemetry-go %s; google-cloud-trace-exporter %s", otel.Version(), Version())
 
-func generateDisplayName(s sdktrace.ReadOnlySpan, format DisplayNameFormatter) string {
+func generateDisplayName(s ReadOnlySpan, format DisplayNameFormatter) string {
 	if format != nil {
 		return format(s)
 	}
@@ -73,7 +74,7 @@ func generateDisplayName(s sdktrace.ReadOnlySpan, format DisplayNameFormatter) s
 
 // If there are duplicate keys present in the list of attributes,
 // then the first value found for the key is preserved.
-func attributeWithLabelsFromResources(sd sdktrace.ReadOnlySpan) []attribute.KeyValue {
+func attributeWithLabelsFromResources(sd ReadOnlySpan) []attribute.KeyValue {
 	attributes := sd.Attributes()
 	if sd.Resource().Len() == 0 {
 		return attributes
@@ -93,7 +94,7 @@ func attributeWithLabelsFromResources(sd sdktrace.ReadOnlySpan) []attribute.KeyV
 	return attributes
 }
 
-func protoFromReadOnlySpan(s sdktrace.ReadOnlySpan, defaultTraceAttributes []attribute.KeyValue, projectID string, format DisplayNameFormatter) *tracepb.Span {
+func protoFromReadOnlySpan(s ReadOnlySpan, defaultTraceAttributes []attribute.KeyValue, projectID string, format DisplayNameFormatter) *tracepb.Span {
 	if s == nil {
 		return nil
 	}
@@ -110,6 +111,7 @@ func protoFromReadOnlySpan(s sdktrace.ReadOnlySpan, defaultTraceAttributes []att
 		StartTime:               timestampProto(s.StartTime()),
 		EndTime:                 timestampProto(s.EndTime()),
 		SameProcessAsParentSpan: &wrapperspb.BoolValue{Value: !s.Parent().IsRemote()},
+		SpanKind:                convertSpanKind(s.SpanKind()),
 	}
 	if s.Parent().SpanID() != s.SpanContext().SpanID() && s.Parent().SpanID().IsValid() {
 		sp.ParentSpanId = s.Parent().SpanID().String()
@@ -178,11 +180,40 @@ func protoFromReadOnlySpan(s sdktrace.ReadOnlySpan, defaultTraceAttributes []att
 		sp.TimeEvents.DroppedAnnotationsCount = clip32(droppedAnnotationsCount)
 	}
 
-	// TODO(ymotongpoo): add implementations for Links
+	sp.Links = linksProtoFromLinks(s.Links())
 
 	return sp
 }
 
+// Converts OTel span links to Cloud Trace links proto in order. If there are
+// more than maxNumLinks links, the first maxNumLinks will be taken and the rest
+// dropped.
+func linksProtoFromLinks(links []trace.Link) *tracepb.Span_Links {
+	numLinks := len(links)
+	if numLinks == 0 {
+		return nil
+	}
+
+	linksPb := &tracepb.Span_Links{}
+	numLinksToKeep := numLinks
+	if numLinksToKeep > maxNumLinks {
+		numLinksToKeep = maxNumLinks
+	}
+
+	for _, link := range links[:numLinksToKeep] {
+		linkPb := &tracepb.Span_Link{
+			TraceId: link.SpanContext.TraceID().String(),
+			SpanId:  link.SpanContext.SpanID().String(),
+			Type:    tracepb.Span_Link_TYPE_UNSPECIFIED,
+		}
+		copyAttributes(&linkPb.Attributes, link.Attributes)
+		linksPb.Link = append(linksPb.Link, linkPb)
+	}
+	linksPb.DroppedLinksCount = clip32(numLinks - numLinksToKeep)
+
+	return linksPb
+}
+
 // timestampProto creates a timestamp proto for a time.Time.
 func timestampProto(t time.Time) *timestamppb.Timestamp {
 	return &timestamppb.Timestamp{
@@ -292,3 +323,23 @@ func clip32(x int) int32 {
 	}
 	return int32(x)
 }
+
+func convertSpanKind(kind trace.SpanKind) tracepb.Span_SpanKind {
+	switch kind {
+	case trace.SpanKindUnspecified, trace.SpanKindInternal:
+		// SpanKindUnspecified is an unspecified SpanKind and is not a
+		// valid SpanKind. SpanKindUnspecified should be replaced with
+		// SpanKindInternal if it is received.
+		return tracepb.Span_INTERNAL
+	case trace.SpanKindServer:
+		return tracepb.Span_SERVER
+	case trace.SpanKindClient:
+		return tracepb.Span_CLIENT
+	case trace.SpanKindProducer:
+		return tracepb.Span_PRODUCER
+	case trace.SpanKindConsumer:
+		return tracepb.Span_CONSUMER
+	default:
+		return tracepb.Span_INTERNAL
+	}
+}


Test patch:
diff --git a/e2e-test-server/Dockerfile b/e2e-test-server/Dockerfile
new file mode 100644
index 0000000..811fe47
--- /dev/null
+++ b/e2e-test-server/Dockerfile
@@ -0,0 +1,40 @@
+# Copyright 2021 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+FROM golang:1.16 as builder
+
+WORKDIR /workspace/e2e-test-server/
+
+# In-repo dependencies
+COPY exporter/trace/ ../exporter/trace/
+
+# cache deps before copying source so that source changes don't invalidate our
+# downloaded layer and we don't need to re-download as much.
+COPY e2e-test-server/go.mod e2e-test-server/go.sum ./
+RUN go mod download
+
+# Copy the go source
+COPY e2e-test-server/app.go ./
+COPY e2e-test-server/endtoendserver/ endtoendserver/
+
+# Build
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -a -o app app.go
+
+# Use distroless as minimal base image to package the manager binary
+# Refer to https://github.com/GoogleContainerTools/distroless for more details
+FROM gcr.io/distroless/static
+WORKDIR /
+COPY --from=builder /workspace/e2e-test-server/app ./
+
+ENTRYPOINT ["/app"]
diff --git a/e2e-test-server/README.md b/e2e-test-server/README.md
new file mode 100644
index 0000000..49af6e5
--- /dev/null
+++ b/e2e-test-server/README.md
@@ -0,0 +1,10 @@
+# E2E Test Server
+
+This unpublished package is for e2e testing. Build a docker image from
+the repository root:
+
+```bash
+docker build --tag=ops-go-e2e:local --file=e2e-test-server/Dockerfile .
+```
+
+and run it with the test server (not yet published).
diff --git a/e2e-test-server/app.go b/e2e-test-server/app.go
new file mode 100644
index 0000000..06850c6
--- /dev/null
+++ b/e2e-test-server/app.go
@@ -0,0 +1,53 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package main
+
+import (
+	"context"
+	"log"
+	"os"
+	"os/signal"
+	"time"
+
+	"github.com/GoogleCloudPlatform/opentelemetry-operations-go/e2e-test-server/endtoendserver"
+)
+
+func main() {
+	runCtx, cancelRunning := context.WithCancel(context.Background())
+
+	// Gracefully close on SIGINT
+	interrupted := make(chan os.Signal, 1)
+	signal.Notify(interrupted, os.Interrupt)
+	go func() {
+		<-interrupted
+		log.Println("Received interrupt signal, shutting down.")
+		cancelRunning()
+	}()
+
+	server, err := endtoendserver.New()
+	if err != nil {
+		log.Fatalf("Could not initialize server: %v", err)
+	}
+
+	err = server.Run(runCtx)
+	if err != nil {
+		log.Printf("Unexpected error occurred: %v", err)
+	}
+
+	log.Print("Shutting down")
+	shutdownCtx, cancelShutdown := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancelShutdown()
+	server.Shutdown(shutdownCtx)
+}
diff --git a/e2e-test-server/endtoendserver/constants.go b/e2e-test-server/endtoendserver/constants.go
new file mode 100644
index 0000000..323f40e
--- /dev/null
+++ b/e2e-test-server/endtoendserver/constants.go
@@ -0,0 +1,47 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package endtoendserver
+
+import (
+	"log"
+	"os"
+	"time"
+)
+
+const (
+	instrumentingModuleName = "opentelemetry-ops-e2e-test-server"
+	scenarioKey             = "scenario"
+	testIDKey               = "test_id"
+	statusCodeKey           = "status_code"
+	traceIDKey              = "trace_id"
+
+	// This is set small to reduce the latency in sending traces so that the tests finish faster.
+	traceBatchTimeout = 100 * time.Millisecond
+)
+
+var (
+	subscriptionMode        = mustGetenv("SUBSCRIPTION_MODE")
+	projectID               = mustGetenv("PROJECT_ID")
+	requestSubscriptionName = mustGetenv("REQUEST_SUBSCRIPTION_NAME")
+	responseTopicName       = mustGetenv("RESPONSE_TOPIC_NAME")
+)
+
+func mustGetenv(key string) string {
+	v := os.Getenv(key)
+	if v == "" {
+		log.Fatalf("environment variable %q must be set", key)
+	}
+	return v
+}
diff --git a/e2e-test-server/endtoendserver/scenarios.go b/e2e-test-server/endtoendserver/scenarios.go
new file mode 100644
index 0000000..5bc6343
--- /dev/null
+++ b/e2e-test-server/endtoendserver/scenarios.go
@@ -0,0 +1,112 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package endtoendserver
+
+import (
+	"context"
+	"log"
+
+	"go.opentelemetry.io/otel/attribute"
+	sdktrace "go.opentelemetry.io/otel/sdk/trace"
+	"go.opentelemetry.io/otel/trace"
+	"google.golang.org/genproto/googleapis/rpc/code"
+)
+
+var scenarioHandlers = map[string]scenarioHandler{
+	"/basicPropagator": (*Server).unimplementedHandler,
+	"/basicTrace":      (*Server).basicTraceHandler,
+	"/complexTrace":    (*Server).complexTraceHandler,
+	"/health":          (*Server).healthHandler,
+}
+
+type scenarioHandler func(*Server, context.Context, request, *sdktrace.TracerProvider) *response
+
+type request struct {
+	scenario string
+	testID   string
+}
+
+type response struct {
+	statusCode code.Code
+	data       []byte
+	traceID    trace.TraceID
+}
+
+// healthHandler returns an OK response without creating any traces.
+func (s *Server) healthHandler(ctx context.Context, req request, tracerProvider *sdktrace.TracerProvider) *response {
+	return &response{statusCode: code.Code_OK}
+}
+
+// basicTraceHandler creates a basic trace and returns an OK response.
+func (s *Server) basicTraceHandler(ctx context.Context, req request, tracerProvider *sdktrace.TracerProvider) *response {
+	if req.testID == "" {
+		log.Printf("request is missing required field 'testID'. request: %+v", req)
+		return &response{
+			statusCode: code.Code_INVALID_ARGUMENT,
+			data:       []byte("request is missing required field 'testID'"),
+		}
+	}
+
+	tracer := tracerProvider.Tracer(instrumentingModuleName)
+	_, span := tracer.Start(ctx, "basicTrace",
+		trace.WithAttributes(attribute.String(testIDKey, req.testID)))
+	span.End()
+
+	return &response{statusCode: code.Code_OK, traceID: span.SpanContext().TraceID()}
+}
+
+// complexTraceHandler creates a complex trace and returns an OK response.
+func (s *Server) complexTraceHandler(ctx context.Context, req request, tracerProvider *sdktrace.TracerProvider) *response {
+	if req.testID == "" {
+		log.Printf("request is missing required field 'testID'. request: %+v", req)
+		return &response{
+			statusCode: code.Code_INVALID_ARGUMENT,
+			data:       []byte("request is missing required field 'testID'"),
+		}
+	}
+
+	tracer := tracerProvider.Tracer(instrumentingModuleName)
+	ctx, rootSpan := tracer.Start(ctx, "complexTrace/root",
+		trace.WithAttributes(attribute.String(testIDKey, req.testID)))
+	defer rootSpan.End()
+
+	func(ctx context.Context) {
+		ctx, span := tracer.Start(ctx, "complexTrace/child1",
+			trace.WithSpanKind(trace.SpanKindServer),
+			trace.WithAttributes(attribute.String(testIDKey, req.testID)))
+		span.End()
+
+		func(ctx context.Context) {
+			_, span := tracer.Start(ctx, "complexTrace/child2",
+				trace.WithSpanKind(trace.SpanKindClient),
+				trace.WithAttributes(attribute.String(testIDKey, req.testID)))
+			span.End()
+		}(ctx)
+	}(ctx)
+
+	func(ctx context.Context) {
+		_, span := tracer.Start(ctx, "complexTrace/child3",
+			trace.WithAttributes(attribute.String(testIDKey, req.testID)))
+		span.End()
+	}(ctx)
+
+	return &response{statusCode: code.Code_OK, traceID: rootSpan.SpanContext().TraceID()}
+}
+
+// unimplementedHandler returns an UNIMPLEMENTED response without creating any traces.
+func (s *Server) unimplementedHandler(ctx context.Context, req request, tracerProvider *sdktrace.TracerProvider) *response {
+	log.Printf("received unhandled scenario %q", req.scenario)
+	return &response{statusCode: code.Code_UNIMPLEMENTED}
+}
diff --git a/e2e-test-server/endtoendserver/server.go b/e2e-test-server/endtoendserver/server.go
new file mode 100644
index 0000000..06e7414
--- /dev/null
+++ b/e2e-test-server/endtoendserver/server.go
@@ -0,0 +1,159 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package endtoendserver
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"strconv"
+
+	"cloud.google.com/go/pubsub"
+	"go.opentelemetry.io/otel/sdk/resource"
+	sdktrace "go.opentelemetry.io/otel/sdk/trace"
+	"google.golang.org/genproto/googleapis/rpc/code"
+
+	texporter "github.com/GoogleCloudPlatform/opentelemetry-operations-go/exporter/trace"
+)
+
+// Server is an end-to-end test service.
+type Server struct {
+	pubsubClient *pubsub.Client
+	// traceProvider *sdktrace.TracerProvider
+}
+
+// New instantiates a new end-to-end test service.
+func New() (*Server, error) {
+	if subscriptionMode != "pull" {
+		return nil, fmt.Errorf("server does not support subscription mode %v", subscriptionMode)
+	}
+
+	pubsubClient, err := pubsub.NewClient(context.Background(), projectID)
+	if err != nil {
+		return nil, err
+	}
+
+	return &Server{
+		pubsubClient: pubsubClient,
+		// traceProvider: traceProvider,
+	}, nil
+}
+
+// Run the end-to-end test service. This method will block until the context is
+// cancel, or an unrecoverable error is encountered.
+func (s *Server) Run(ctx context.Context) error {
+	sub := s.pubsubClient.Subscription(requestSubscriptionName)
+	log.Printf("End-to-end test service listening on %s", sub)
+	return sub.Receive(ctx, func(ctx context.Context, m *pubsub.Message) { s.onReceive(ctx, m) })
+}
+
+// Shutdown gracefully shuts down the service, flushing and closing resources as
+// appropriate.
+func (s *Server) Shutdown(ctx context.Context) {
+	if err := s.pubsubClient.Close(); err != nil {
+		log.Printf("pubsubClient.Close(): %v", err)
+	}
+}
+
+// onReceive executes a scenario based on the incoming message from the test runner.
+func (s *Server) onReceive(ctx context.Context, m *pubsub.Message) {
+	defer m.Ack()
+
+	tracerProvider, err := newTraceProvider()
+	if err != nil {
+		log.Printf("could not initialize a tracer-provider: %v", err)
+		return
+	}
+
+	testID := m.Attributes[testIDKey]
+	scenario := m.Attributes[scenarioKey]
+	if scenario == "" {
+		log.Printf("could not find required attribute %q in message %+v", scenarioKey, m)
+		err := s.respond(ctx, testID, &response{
+			statusCode: code.Code_INVALID_ARGUMENT,
+			data:       []byte(fmt.Sprintf("required %q is missing", scenarioKey)),
+		})
+		if err != nil {
+			log.Printf("could not publish response: %v", err)
+		}
+		return
+	}
+
+	handler := scenarioHandlers[scenario]
+	if handler == nil {
+		handler = (*Server).unimplementedHandler
+	}
+
+	req := request{
+		scenario: scenario,
+		testID:   testID,
+	}
+
+	res := handler(s, ctx, req, tracerProvider)
+
+	if err := shutdownTraceProvider(ctx, tracerProvider); err != nil {
+		log.Printf("could not shutdown tracer-provider: %v", err)
+		s.respond(ctx, testID, &response{
+			statusCode: code.Code_INTERNAL,
+			data:       []byte(fmt.Sprintf("could not shutdown tracer-provider: %v", err)),
+		})
+		return
+	}
+
+	if err := s.respond(ctx, testID, res); err != nil {
+		log.Printf("could not publish response: %v", err)
+	}
+}
+
+// respond to the test runner that we finished executing the scenario by sending
+// a message to the response pubsub topic.
+func (s *Server) respond(ctx context.Context, testID string, res *response) error {
+	m := &pubsub.Message{
+		Data: res.data,
+		Attributes: map[string]string{
+			testIDKey:     testID,
+			statusCodeKey: strconv.Itoa(int(res.statusCode)),
+			traceIDKey:    res.traceID.String(),
+		},
+	}
+	publishResult := s.pubsubClient.Topic(responseTopicName).Publish(ctx, m)
+	_, err := publishResult.Get(ctx)
+	return err
+}
+
+func newTraceProvider() (*sdktrace.TracerProvider, error) {
+	exporter, err := texporter.NewExporter(texporter.WithProjectID(projectID))
+	if err != nil {
+		return nil, err
+	}
+
+	traceProvider := sdktrace.NewTracerProvider(
+		sdktrace.WithBatcher(exporter, sdktrace.WithBatchTimeout(traceBatchTimeout)),
+		// Set resource to empty so we don't add labels that the
+		// e2e test runner doesn't expect. See b/192584837.
+		sdktrace.WithResource(resource.Empty()))
+
+	return traceProvider, nil
+}
+
+func shutdownTraceProvider(ctx context.Context, tracerProvider *sdktrace.TracerProvider) error {
+	if err := tracerProvider.ForceFlush(ctx); err != nil {
+		return fmt.Errorf("traceProvider.ForceFlush(): %v", err)
+	}
+	if err := tracerProvider.Shutdown(ctx); err != nil {
+		return fmt.Errorf("traceProvider.Shutdown(): %v", err)
+	}
+	return nil
+}
diff --git a/e2e-test-server/go.mod b/e2e-test-server/go.mod
new file mode 100644
index 0000000..9bf5d4b
--- /dev/null
+++ b/e2e-test-server/go.mod
@@ -0,0 +1,14 @@
+module github.com/GoogleCloudPlatform/opentelemetry-operations-go/e2e-test-server
+
+go 1.16
+
+require (
+	cloud.google.com/go/pubsub v1.12.0
+	github.com/GoogleCloudPlatform/opentelemetry-operations-go/exporter/trace v0.0.0
+	go.opentelemetry.io/otel v1.0.0-RC1
+	go.opentelemetry.io/otel/sdk v1.0.0-RC1
+	go.opentelemetry.io/otel/trace v1.0.0-RC1
+	google.golang.org/genproto v0.0.0-20210614143202-012ab6975634
+)
+
+replace github.com/GoogleCloudPlatform/opentelemetry-operations-go/exporter/trace => ../exporter/trace
diff --git a/e2e-test-server/go.sum b/e2e-test-server/go.sum
new file mode 100644
index 0000000..64abc56
--- /dev/null
+++ b/e2e-test-server/go.sum
@@ -0,0 +1,587 @@
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diff --git a/exporter/trace/cloudtrace_test.go b/exporter/trace/cloudtrace_test.go
index 01c8163..d87f905 100644
--- a/exporter/trace/cloudtrace_test.go
+++ b/exporter/trace/cloudtrace_test.go
@@ -25,6 +25,7 @@ import (
 	"go.opentelemetry.io/otel"
 	"go.opentelemetry.io/otel/codes"
 	sdktrace "go.opentelemetry.io/otel/sdk/trace"
+	"go.opentelemetry.io/otel/trace"
 
 	"github.com/googleinterns/cloud-operations-api-mock/cloudmock"
 	"github.com/stretchr/testify/assert"
@@ -60,7 +61,11 @@ func TestExporter_ExportSpan(t *testing.T) {
 	span.End()
 	assert.True(t, span.SpanContext().IsValid())
 
-	_, span = otel.Tracer("test-tracer").Start(context.Background(), "test-span-with-error-status")
+	_, span = otel.Tracer("test-tracer").Start(
+		context.Background(),
+		"test-span-with-error-status",
+		trace.WithLinks(trace.Link{SpanContext: genSpanContext()}),
+	)
 	span.SetStatus(codes.Error, "Error Message")
 	span.End()
 
@@ -73,6 +78,8 @@ func TestExporter_ExportSpan(t *testing.T) {
 	assert.EqualValues(t, codepb.Code_UNKNOWN, mock.GetSpan(1).GetStatus().Code)
 	assert.EqualValues(t, "Error Message", mock.GetSpan(1).GetStatus().Message)
 	assert.EqualValues(t, "TEST_VALUE", mock.GetSpan(0).Attributes.AttributeMap["TEST_ATTRIBUTE"].GetStringValue().Value)
+	assert.Nil(t, mock.GetSpan(0).Links)
+	assert.Len(t, mock.GetSpan(1).Links.Link, 1)
 }
 
 func TestExporter_DisplayNameNoFormatter(t *testing.T) {
@@ -109,7 +116,7 @@ func TestExporter_DisplayNameFormatter(t *testing.T) {
 	clientOpt := []option.ClientOption{option.WithGRPCConn(mock.ClientConn())}
 
 	spanName := "span1234"
-	format := func(s sdktrace.ReadOnlySpan) string {
+	format := func(s ReadOnlySpan) string {
 		return "TEST_FORMAT" + s.Name()
 	}
 
diff --git a/exporter/trace/trace_proto_test.go b/exporter/trace/trace_proto_test.go
new file mode 100644
index 0000000..8273a00
--- /dev/null
+++ b/exporter/trace/trace_proto_test.go
@@ -0,0 +1,81 @@
+// Copyright 2021 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package trace
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"go.opentelemetry.io/otel/attribute"
+	sdktrace "go.opentelemetry.io/otel/sdk/trace"
+	"go.opentelemetry.io/otel/trace"
+	tracepb "google.golang.org/genproto/googleapis/devtools/cloudtrace/v2"
+)
+
+func genSpanContext() trace.SpanContext {
+	tracer := sdktrace.NewTracerProvider().Tracer("")
+	_, span := tracer.Start(context.Background(), "")
+	return span.SpanContext()
+}
+
+func TestTraceProto_linksProtoFromLinks(t *testing.T) {
+	t.Run("Should be nil when no links", func(t *testing.T) {
+		assert.Nil(t, linksProtoFromLinks([]trace.Link{}))
+	})
+
+	t.Run("Can convert one link", func(t *testing.T) {
+		spanContext := genSpanContext()
+		link := trace.Link{
+			SpanContext: spanContext,
+			Attributes: []attribute.KeyValue{
+				attribute.String("hello", "world"),
+			},
+		}
+		linksPb := linksProtoFromLinks([]trace.Link{link})
+
+		assert.NotNil(t, linksPb)
+		assert.EqualValues(t, linksPb.DroppedLinksCount, 0)
+		assert.Len(t, linksPb.Link, 1)
+		assert.Equal(t, spanContext.TraceID().String(), linksPb.Link[0].TraceId)
+		assert.Equal(t, spanContext.SpanID().String(), linksPb.Link[0].SpanId)
+		assert.Equal(t, tracepb.Span_Link_TYPE_UNSPECIFIED, linksPb.Link[0].Type)
+		assert.Len(t, linksPb.Link[0].Attributes.AttributeMap, 1)
+		assert.Contains(t, linksPb.Link[0].Attributes.AttributeMap, "hello")
+		assert.Equal(
+			t,
+			"world",
+			linksPb.Link[0].Attributes.AttributeMap["hello"].GetStringValue().Value,
+		)
+	})
+
+	t.Run("Drops links when there are more than 128", func(t *testing.T) {
+		var links []trace.Link
+		for i := 0; i < 148; i++ {
+			links = append(
+				links,
+				trace.Link{
+					SpanContext: genSpanContext(),
+					Attributes: []attribute.KeyValue{
+						attribute.String("hello", "world"),
+					},
+				})
+		}
+		linksPb := linksProtoFromLinks(links)
+		assert.NotNil(t, linksPb)
+		assert.EqualValues(t, linksPb.DroppedLinksCount, 20)
+		assert.Len(t, linksPb.Link, maxNumLinks)
+	})
+}