try log (#513)

dataplane/standalone/lucius/BUILD

@@ -16,6 +16,8 @@ go_library(
         "//proto/forwarding",
         "@com_github_googlecloudplatform_opentelemetry_operations_go_exporter_trace//:trace",
         "@com_github_grpc_ecosystem_go_grpc_middleware_v2//interceptors/logging",
+        "@com_google_cloud_go_trace//apiv2",
+        "@com_google_cloud_go_trace//apiv2/tracepb",
         "@io_opentelemetry_go_contrib_detectors_gcp//:gcp",
         "@io_opentelemetry_go_contrib_instrumentation_google_golang_org_grpc_otelgrpc//:otelgrpc",
         "@io_opentelemetry_go_otel//:otel",
@@ -30,6 +32,7 @@ go_library(
         "@org_golang_google_grpc//credentials/insecure",
         "@org_golang_google_grpc//metadata",
         "@org_golang_google_grpc//reflection",
+        "@org_golang_google_protobuf//types/known/timestamppb",
     ],
 )
 

dataplane/standalone/lucius/lucius.go

@@ -22,7 +22,10 @@ import (
 	"log"
 	"log/slog"
 	"net"
+	"os"
 
+	traceapi "cloud.google.com/go/trace/apiv2"
+	"cloud.google.com/go/trace/apiv2/tracepb"
 	texporter "github.com/GoogleCloudPlatform/opentelemetry-operations-go/exporter/trace"
 	"github.com/grpc-ecosystem/go-grpc-middleware/v2/interceptors/logging"
 	"go.opentelemetry.io/contrib/detectors/gcp"
@@ -39,6 +42,7 @@ import (
 	"google.golang.org/grpc/credentials/insecure"
 	"google.golang.org/grpc/metadata"
 	"google.golang.org/grpc/reflection"
+	"google.golang.org/protobuf/types/known/timestamppb"
 
 	"github.com/openconfig/lemming/dataplane/dplaneopts"
 	"github.com/openconfig/lemming/dataplane/saiserver"
@@ -132,6 +136,29 @@ func setupOTelSDK(ctx context.Context) (func(context.Context) error, error) {
 		if err != nil {
 			return nil, err
 		}
+		// Create a test span and try exporting it to verify authentication is successful.
+		c, err := traceapi.NewClient(ctx)
+		if err != nil {
+			return nil, err
+		}
+		_, span := tracer.Start(ctx, "ping")
+		span.End()
+
+		batchCtx := metadata.NewOutgoingContext(ctx, metadata.New(map[string]string{"x-goog-user-project": *gcpProject}))
+		err = c.BatchWriteSpans(batchCtx, &tracepb.BatchWriteSpansRequest{
+			Name: fmt.Sprintf("projects/%s", *gcpProject),
+			Spans: []*tracepb.Span{{
+				Name:        fmt.Sprintf("projects/%s/traces/%s/spans/%s", *gcpProject, span.SpanContext().TraceID().String(), span.SpanContext().SpanID().String()),
+				SpanId:      span.SpanContext().SpanID().String(),
+				DisplayName: &tracepb.TruncatableString{Value: "test"},
+				StartTime:   timestamppb.Now(),
+				EndTime:     timestamppb.Now(),
+			}},
+		})
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "failed to export test trace, disabling exporter: %v\n", err)
+			exporter = nil
+		}
 		cloudlog.SetGlobalLogger(ctx, *gcpProject, "lucius")
 	}
 

go.mod

@@ -5,6 +5,7 @@ go 1.23
 require (
 	cloud.google.com/go/cloudbuild v1.16.3
 	cloud.google.com/go/logging v1.10.0
+	cloud.google.com/go/trace v1.10.10
 	github.com/GoogleCloudPlatform/opentelemetry-operations-go/exporter/trace v1.24.1
 	github.com/fatih/color v1.15.0
 	github.com/go-logr/logr v1.4.2
@@ -69,7 +70,6 @@ require (
 	cloud.google.com/go/iam v1.1.10 // indirect
 	cloud.google.com/go/longrunning v0.5.9 // indirect
 	cloud.google.com/go/pubsub v1.40.0 // indirect
-	cloud.google.com/go/trace v1.10.10 // indirect
 	github.com/GoogleCloudPlatform/opentelemetry-operations-go/detectors/gcp v1.24.2 // indirect
 	github.com/GoogleCloudPlatform/opentelemetry-operations-go/internal/resourcemapping v0.48.1 // indirect
 	github.com/Masterminds/semver/v3 v3.2.1 // indirect

internal/cloudlog/cloudlog.go

@@ -35,6 +35,10 @@ func SetGlobalLogger(ctx context.Context, project, logName string) error {
 	if err != nil {
 		return err
 	}
+	if err := cl.Ping(ctx); err != nil {
+		fmt.Fprintf(os.Stderr, "failed to ping cloud logging, not exporting logs: %v\n", err)
+		return err
+	}
 
 	h := &cloudLogHandle{
 		Handler: slog.NewJSONHandler(os.Stderr, &slog.HandlerOptions{}),
@@ -52,6 +56,7 @@ func SetGlobalLogger(ctx context.Context, project, logName string) error {
 			select {
 			case <-sigs:
 				h.l.Flush()
+				os.Exit(1)
 			case <-t.C:
 				if err := h.l.Flush(); err != nil {
 					fmt.Fprintf(os.Stderr, "log flush err: %v", err)