internal/exectracetest: move execution trace testing to separate module

internal/exectracetest/exectrace_go120.go

@@ -0,0 +1,8 @@
+// Unless explicitly stated otherwise all files in this repository are licensed
+// under the Apache License Version 2.0.
+// This product includes software developed at Datadog (https://www.datadoghq.com/).
+// Copyright 2024 Datadog, Inc.
+
+package exectracetest
+
+// Placeholder -- the latestgolang.org/x/exp does not support go1.20

internal/exectracetest/exectrace_test.go

@@ -0,0 +1,138 @@
+// Unless explicitly stated otherwise all files in this repository are licensed
+// under the Apache License Version 2.0.
+// This product includes software developed at Datadog (https://www.datadoghq.com/).
+// Copyright 2024 Datadog, Inc.
+
+//go:build go1.21
+
+// exectracetest tests execution tracer-related functionality.
+// The official execution trace parser lives in golang.org/x/exp,
+// which we generally should avoid upgrading as it is prone
+// to breaking changes which could affect our customers.
+// So, this package lives in a separate module in order to
+// freely upgrade golang.org/x/exp/trace as the trace format changes.
+package exectracetest
+
+import (
+ "bytes"
+ "context"
+ "io"
+ "regexp"
+ "runtime/pprof"
+ "runtime/trace"
+ "testing"
+ "time"
+
+ "github.com/google/pprof/profile"
+ exptrace "golang.org/x/exp/trace"
+ "gopkg.in/DataDog/dd-trace-go.v1/ddtrace/tracer"
+)
+
+type discardLogger struct{}
+
+func (discardLogger) Log(msg string) {}
+
+// collectTestData runs f under the CPU profiler and execution tracer
+func collectTestData(t *testing.T, f func()) (*profile.Profile, []exptrace.Event) {
+ cpuProf := new(bytes.Buffer)
+ execTrace := new(bytes.Buffer)
+ if pprof.StartCPUProfile(cpuProf) != nil {
+ t.Skip("CPU profiler already running")
+ }
+ defer pprof.StopCPUProfile() // okay to double-stop
+ if trace.Start(execTrace) != nil {
+ t.Skip("execution tracer already running")
+ }
+ defer trace.Stop() // okay to double-stop
+
+ f()
+
+ trace.Stop()
+ pprof.StopCPUProfile()
+
+ pprof, err := profile.Parse(cpuProf)
+ if err != nil {
+ t.Fatalf("parsing profile: %s", err)
+ }
+ reader, err := exptrace.NewReader(execTrace)
+ if err != nil {
+ t.Fatalf("reading execution trace: %s", err)
+ }
+ var traceEvents []exptrace.Event
+ for {
+ ev, err := reader.ReadEvent()
+ if err == io.EOF {
+ break
+ } else if err != nil {
+ t.Fatalf("reading event: %s", err)
+ }
+ traceEvents = append(traceEvents, ev)
+ }
+ return pprof, traceEvents
+}
+
+func waste(d time.Duration) {
+ now := time.Now()
+ for time.Since(now) < d {
+ }
+}
+
+func TestSpanDoubleFinish(t *testing.T) {
+ generate := func(d time.Duration) {
+ foo, ctx := tracer.StartSpanFromContext(context.Background(), "foo")
+ bar, _ := tracer.StartSpanFromContext(ctx, "bar")
+ bar.Finish()
+ foo.Finish()
+ bar.Finish()
+ // If we don't handle double finish right, we will see CPU profile samples
+ // for waste tagged with the trace/span IDs from foo
+ waste(d)
+ }
+
+ var (
+ pprof *profile.Profile
+ execTrace []exptrace.Event
+ retries int
+ )
+ const maxRetries = 5
+ for duration := 30 * time.Millisecond; retries < maxRetries; retries++ {
+ pprof, execTrace = collectTestData(t, func() {
+ generate(duration)
+ })
+ focus, _, _, _ := pprof.FilterSamplesByName(regexp.MustCompile("waste"), nil, nil, nil)
+ if focus {
+ break
+ }
+ // Retry with longer run to reduce flake likelihood
+ duration *= 2
+ }
+ if retries == maxRetries {
+ t.Fatalf("could not collect sufficient data after %d retries", maxRetries)
+ }
+
+ // Check CPU profile: we should have un-set the labels
+ // for the goroutine by the time waste5 runs
+ for _, sample := range pprof.Sample {
+ if labels := sample.Label; len(labels) > 0 {
+ t.Errorf("unexpected labels for sample: %+v", labels)
+ }
+ }
+
+ // Check execution trace: we should not emit a second task end event
+ // even though we finish the "bar" span twice
+ taskEvents := make(map[exptrace.TaskID][]exptrace.Event)
+ for _, ev := range execTrace {
+ switch ev.Kind() {
+ case exptrace.EventTaskBegin, exptrace.EventTaskEnd:
+ id := ev.Task().ID
+ taskEvents[id] = append(taskEvents[id], ev)
+ }
+ }
+ for id, events := range taskEvents {
+ if len(events) > 2 {
+ t.Errorf("extraneous events for task %d: %v", id, events)
+ }
+ }
+}
+
+// TODO: move database/sql tests here? likely requires copying over contrib/sql/internal.MockDriver

internal/exectracetest/go.mod

@@ -0,0 +1,40 @@
+module gopkg.in/DataDog/dd-trace-go.v1/internal/exectracetest
+
+go 1.20
+
+require (
+ github.com/google/pprof v0.0.0-20230817174616-7a8ec2ada47b
+ golang.org/x/exp v0.0.0-20240506185415-9bf2ced13842
+ gopkg.in/DataDog/dd-trace-go.v1 v1.64.0
+)
+
+require (
+ github.com/DataDog/appsec-internal-go v1.5.0 // indirect
+ github.com/DataDog/datadog-agent/pkg/obfuscate v0.48.0 // indirect
+ github.com/DataDog/datadog-agent/pkg/remoteconfig/state v0.48.1 // indirect
+ github.com/DataDog/datadog-go/v5 v5.3.0 // indirect
+ github.com/DataDog/go-libddwaf/v3 v3.2.0 // indirect
+ github.com/DataDog/go-tuf v1.0.2-0.5.2 // indirect
+ github.com/DataDog/sketches-go v1.4.5 // indirect
+ github.com/Microsoft/go-winio v0.6.1 // indirect
+ github.com/cespare/xxhash/v2 v2.2.0 // indirect
+ github.com/dustin/go-humanize v1.0.1 // indirect
+ github.com/ebitengine/purego v0.6.0-alpha.5 // indirect
+ github.com/google/uuid v1.5.0 // indirect
+ github.com/outcaste-io/ristretto v0.2.3 // indirect
+ github.com/philhofer/fwd v1.1.2 // indirect
+ github.com/pkg/errors v0.9.1 // indirect
+ github.com/secure-systems-lab/go-securesystemslib v0.7.0 // indirect
+ github.com/tinylib/msgp v1.1.8 // indirect
+ go.uber.org/atomic v1.11.0 // indirect
+ golang.org/x/mod v0.17.0 // indirect
+ golang.org/x/sync v0.7.0 // indirect
+ golang.org/x/sys v0.20.0 // indirect
+ golang.org/x/time v0.3.0 // indirect
+ golang.org/x/tools v0.21.0 // indirect
+ golang.org/x/xerrors v0.0.0-20220907171357-04be3eba64a2 // indirect
+ google.golang.org/protobuf v1.32.0 // indirect
+)
+
+// use local version of dd-trace-go
+replace gopkg.in/DataDog/dd-trace-go.v1 => ../..

internal/exectracetest/go.sum

@@ -0,0 +1,146 @@
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