HotROD init OpenTelemetry SDK and bridge

tracing.go

// Init initializes OpenTelemetry SDK and uses OTel-OpenTracing Bridge
// to return an OpenTracing-compatible tracer.
func Init(
	serviceName string, 
	exporterType string, 
	metricsFactory metrics.Factory, 
	logger log.Factory
) opentracing.Tracer {
	exp, err := createOtelExporter(exporterType)
	if err != nil {
		logger.Bg().Fatal("cannot create exporter", 
			zap.String("exporterType", exporterType), zap.Error(err))
	}
	logger.Bg().Info("using " + exporterType + " trace exporter")

	tp := sdktrace.NewTracerProvider(
		sdktrace.WithBatcher(exp),
		sdktrace.WithResource(resource.NewWithAttributes(
			semconv.SchemaURL,
			semconv.ServiceNameKey.String(serviceName),
		)),
	)
	otTracer, _ := otbridge.NewTracerPair(tp.Tracer(""))
	logger.Bg().Info("created OTEL->OT brige", zap.String("service-name", serviceName))
	return otTracer
}