// tracing.js
'use strict'
const process = require('process');
const opentelemetry = require('@opentelemetry/sdk-node');
const { getNodeAutoInstrumentations } = require('@opentelemetry/auto-instrumentations-node');
const { OTLPTraceExporter } = require('@opentelemetry/exporter-trace-otlp-http');
const { Resource } = require('@opentelemetry/resources');
const { SemanticResourceAttributes } = require('@opentelemetry/semantic-conventions');
const { diag, DiagConsoleLogger, DiagLogLevel } = require('@opentelemetry/api');

const init = (serviceName, environment) => {

  diag.setLogger(new DiagConsoleLogger(), DiagLogLevel.DEBUG);

  const exporterOptions = {
    url: '<http://172.31.1.52:4318/v1/traces>',
  }

  const traceExporter = new OTLPTraceExporter(exporterOptions);
  const sdk = new opentelemetry.NodeSDK({
    traceExporter,
    instrumentations: [getNodeAutoInstrumentations()],
    resource: new Resource({
      [SemanticResourceAttributes.SERVICE_NAME]: serviceName,
      [SemanticResourceAttributes.DEPLOYMENT_ENVIRONMENT]: environment
    })
  });

  // initialize the SDK and register with the OpenTelemetry API
  // this enables the API to record telemetry
  sdk.start()
    .then(() => console.log('Tracing initialized'))
    .catch((error) => console.log('Error initializing tracing', error));

  // gracefully shut down the SDK on process exit
  process.on('SIGTERM', () => {
    sdk.shutdown()
      .then(() => console.log('Tracing terminated'))
      .catch((error) => console.log('Error terminating tracing', error))
      .finally(() => process.exit(0));
  });
}

module.exports = {
  init: init,
}

// index.js 
const { init } = require('./tracing')
init('show-ip', 'production')

const app = require('./app.js');
const PORT = process.env.PORT || 8080;

app.listen(PORT, () =>
  console.log(`nodejs-eventarc-pubsub listening on port ${PORT}`)
);

Recording is off, propagating context in a non-recording span