|
| 1 | +package common |
| 2 | + |
| 3 | +import ( |
| 4 | + "context" |
| 5 | + "fmt" |
| 6 | + "os" |
| 7 | + |
| 8 | + "github.com/go-logr/logr" |
| 9 | + "go.opentelemetry.io/otel" |
| 10 | + "go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc" |
| 11 | + "go.opentelemetry.io/otel/propagation" |
| 12 | + "go.opentelemetry.io/otel/sdk/resource" |
| 13 | + sdktrace "go.opentelemetry.io/otel/sdk/trace" |
| 14 | + semconv "go.opentelemetry.io/otel/semconv/v1.37.0" |
| 15 | + |
| 16 | + "sigs.k8s.io/gateway-api-inference-extension/version" |
| 17 | +) |
| 18 | + |
| 19 | +type errorHandler struct { |
| 20 | + logger logr.Logger |
| 21 | +} |
| 22 | + |
| 23 | +func (h *errorHandler) Handle(err error) { |
| 24 | + h.logger.Error(err, "trace error occurred") |
| 25 | +} |
| 26 | + |
| 27 | +func InitTracing(ctx context.Context, logger logr.Logger) error { |
| 28 | + logger = logger.WithName("trace") |
| 29 | + loggerWrap := &errorHandler{logger: logger} |
| 30 | + |
| 31 | + serviceName, ok := os.LookupEnv("OTEL_SERVICE_NAME") |
| 32 | + if !ok { |
| 33 | + serviceName = "gateway-api-inference-extension" |
| 34 | + os.Setenv("OTEL_SERVICE_NAME", serviceName) |
| 35 | + } |
| 36 | + |
| 37 | + collectorAddr, ok := os.LookupEnv("OTEL_EXPORTER_OTLP_ENDPOINT") |
| 38 | + if !ok { |
| 39 | + collectorAddr = "http://localhost:4317" |
| 40 | + os.Setenv("OTEL_EXPORTER_OTLP_ENDPOINT", collectorAddr) |
| 41 | + } |
| 42 | + |
| 43 | + traceExporter, err := otlptracegrpc.New(ctx, otlptracegrpc.WithInsecure()) |
| 44 | + if err != nil { |
| 45 | + loggerWrap.Handle(fmt.Errorf("%s: %v", "new OTel trace gRPC exporter fail", err)) |
| 46 | + return nil |
| 47 | + } |
| 48 | + |
| 49 | + logger.Info(fmt.Sprintf("OTel trace exporter connect to: %s with service name: %s", collectorAddr, serviceName)) |
| 50 | + opt := []sdktrace.TracerProviderOption{ |
| 51 | + sdktrace.WithBatcher(traceExporter), |
| 52 | + sdktrace.WithSampler(sdktrace.ParentBased(sdktrace.AlwaysSample())), |
| 53 | + sdktrace.WithResource(resource.NewWithAttributes( |
| 54 | + semconv.SchemaURL, |
| 55 | + semconv.ServiceVersionKey.String(version.BuildRef), |
| 56 | + )), |
| 57 | + } |
| 58 | + |
| 59 | + tracerProvider := sdktrace.NewTracerProvider(opt...) |
| 60 | + otel.SetTracerProvider(tracerProvider) |
| 61 | + otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{})) |
| 62 | + otel.SetErrorHandler(loggerWrap) |
| 63 | + |
| 64 | + go func() { |
| 65 | + <-ctx.Done() |
| 66 | + err := tracerProvider.Shutdown(context.Background()) |
| 67 | + if err != nil { |
| 68 | + loggerWrap.Handle(fmt.Errorf("%s: %v", "failed to shutdown MeterProvider", err)) |
| 69 | + } |
| 70 | + |
| 71 | + logger.Info("trace provider shutting down") |
| 72 | + }() |
| 73 | + |
| 74 | + return nil |
| 75 | +} |
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