How to get current span from instrumentation-http

[brpaz]

Hello.

I am trying to integrate open-telemetry in a nuxt application, and I am trying to add the traceId and spanId globally to my logger.

I am using Pino and I was attempting to use a mixin to retrieve the current span, but I was always getting undefined.

To try to isolate the issue, I tried the same code in my Nuxt API endpoint and I also get undefined.

The http instrumentation is working, as I get the spans in console output. I just can´t seem to get the active span in my application.

tracing.ts

/*instrumentation.ts*/
import { NodeSDK } from '@opentelemetry/sdk-node'
import { trace } from '@opentelemetry/api'
import type { Tracer } from '@opentelemetry/api'
import {
  BatchSpanProcessor,
  ConsoleSpanExporter,
  SimpleSpanProcessor,
} from '@opentelemetry/sdk-trace-node'
import { HttpInstrumentation } from '@opentelemetry/instrumentation-http'
import type { AppConfig } from './config'
import { Resource } from '@opentelemetry/resources'
import {
  ATTR_SERVICE_NAME,
  ATTR_SERVICE_VERSION,
} from '@opentelemetry/semantic-conventions'

const setupTracing = (config: AppConfig) => {
  if (!config.tracing.enabled) {
    console.log('Tracing is disabled')
    return
  }

  const sdk = new NodeSDK({
    resource: new Resource({
      [ATTR_SERVICE_NAME]: config.tracing.appName,
      [ATTR_SERVICE_VERSION]: '1.0.0',
    }),
    spanProcessors: [new BatchSpanProcessor(new ConsoleSpanExporter())],
    traceExporter: new ConsoleSpanExporter(),
    instrumentations: [new HttpInstrumentation()],
  })

  console.log('Starting tracing sdk')
  sdk.start()

  process.on('SIGTERM', () => shutdown(sdk))
  process.on('SIGINT', () => shutdown(sdk))
}

const shutdown = (sdk: NodeSDK) => {
  console.log('Shutting down tracing sdk')
  sdk.shutdown().then(() => {
    console.log('Tracing sdk has been shutdown')
    process.exit(0)
  })
}


export { setupTracing }

Handler:

import { context, trace } from '@opentelemetry/api'

export default defineEventHandler(async (event) => {
  const currentSpan = trace.getSpan(context.active())
  const traceId = currentSpan ? currentSpan.spanContext().traceId : null
  const spanId = currentSpan ? currentSpan.spanContext().spanId : null

  return {
    hello: 'world',
    traceId,
    spanId,
  }
})

The setupTracing is called the start of my nuxt.config file.

What I am missing?