distro: Add WithIDGenerator option

CHANGELOG.md

@@ -8,6 +8,11 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 
 ## [Unreleased]
 
+### Add
+
+- Add the `WithIDGenerator` option to
+  `github.com/signalfx/splunk-otel-go/distro`. (#2634)
+
 ## [1.10.0] - 2023-11-10
 
 This release upgrades [OpenTelemetry Go to v1.20.0/v0.43.0][otel-v1.20.0]

distro/config.go

@@ -73,9 +73,10 @@ type exporterConfig struct {
 
 // config is the configuration used to create and operate an SDK.
 type config struct {
-	Logger     logr.Logger
-	Propagator propagation.TextMapPropagator
-	SpanLimits *trace.SpanLimits
+	Logger      logr.Logger
+	Propagator  propagation.TextMapPropagator
+	SpanLimits  *trace.SpanLimits
+	IDGenerator trace.IDGenerator
 
 	ExportConfig        *exporterConfig
 	TracesExporterFunc  traceExporterFunc
@@ -147,3 +148,11 @@ func WithLogger(l logr.Logger) Option {
 		c.Logger = l
 	})
 }
+
+// WithIDGenerator configures the generator used to generate span and trace IDs.
+// If this option is not provided, the SDK's default ID generator will be used.
+func WithIDGenerator(g trace.IDGenerator) Option {
+	return optionFunc(func(c *config) {
+		c.IDGenerator = g
+	})
+}

distro/go.mod

@@ -15,6 +15,7 @@ require (
 	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.20.0
 	go.opentelemetry.io/otel/sdk v1.20.0
 	go.opentelemetry.io/otel/sdk/metric v1.20.0
+	go.opentelemetry.io/otel/trace v1.20.0
 	go.opentelemetry.io/proto/otlp v1.0.0
 	go.uber.org/goleak v1.3.0
 	go.uber.org/zap v1.26.0
@@ -34,7 +35,6 @@ require (
 	go.opentelemetry.io/contrib/propagators/ot v1.21.0 // indirect
 	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.20.0 // indirect
 	go.opentelemetry.io/otel/metric v1.20.0 // indirect
-	go.opentelemetry.io/otel/trace v1.20.0 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
 	golang.org/x/net v0.18.0 // indirect
 	golang.org/x/sys v0.14.0 // indirect

distro/otel.go

@@ -153,6 +153,7 @@ func runTraces(c *config, res *resource.Resource) (shutdownFunc, error) {
 		trace.WithResource(res),
 		trace.WithRawSpanLimits(*c.SpanLimits),
 		trace.WithSpanProcessor(trace.NewBatchSpanProcessor(exp)),
+		trace.WithIDGenerator(c.IDGenerator),
 	}
 	if _, ok := os.LookupEnv(tracesSamplerKey); !ok {
 		o = append(o, trace.WithSampler(trace.AlwaysSample()))

distro/otel_test.go

@@ -31,6 +31,7 @@ import (
 	"github.com/stretchr/testify/require"
 	"github.com/tonglil/buflogr"
 	"go.opentelemetry.io/otel"
+	otelt "go.opentelemetry.io/otel/trace"
 	cmpb "go.opentelemetry.io/proto/otlp/collector/metrics/v1"
 	ctpb "go.opentelemetry.io/proto/otlp/collector/trace/v1"
 	comm "go.opentelemetry.io/proto/otlp/common/v1"
@@ -341,6 +342,20 @@ func TestTracesResource(t *testing.T) {
 	assertResource(t, got.Resource.GetAttributes())
 }
 
+func TestWithIDGenerator(t *testing.T) {
+	coll := &collector{}
+	coll.Start(t)
+	t.Setenv("OTEL_TRACES_EXPORTER", "otlp")
+	t.Setenv("OTEL_EXPORTER_OTLP_ENDPOINT", "http://"+coll.Endpoint)
+
+	emitSpan(t, distro.WithIDGenerator(&testIDGenerator{}))
+
+	got := coll.ExportedSpans()
+	require.NotNil(t, got)
+	assert.Contains(t, string(got.Spans[0].TraceId), "testtrace")
+	assert.Contains(t, string(got.Spans[0].SpanId), "testspan")
+}
+
 func TestRunOTLPMetricsExporter(t *testing.T) {
 	assertBase := func(t *testing.T, got *metricsExportRequest) {
 		assertHasMetric(t, got, metricName)
@@ -662,6 +677,8 @@ type (
 		Resource *rpb.Resource
 		Metrics  []*mpb.Metric
 	}
+
+	testIDGenerator struct{}
 )
 
 func (coll *collector) Start(t *testing.T) {
@@ -759,3 +776,17 @@ func (cmss *collectorMetricsServiceServer) Export(ctx context.Context, exp *cmpb
 
 	return &cmpb.ExportMetricsServiceResponse{}, nil
 }
+
+func (g *testIDGenerator) NewSpanID(_ context.Context, _ otelt.TraceID) otelt.SpanID {
+	sid := otelt.SpanID{}
+	copy(sid[:], "testspan")
+	return sid
+}
+
+func (g *testIDGenerator) NewIDs(_ context.Context) (otelt.TraceID, otelt.SpanID) {
+	tid := otelt.TraceID{}
+	copy(tid[:], "testtrace")
+	sid := otelt.SpanID{}
+	copy(sid[:], "testspan")
+	return tid, sid
+}