The trace_id never change with fastify and fastify-redis using fastify.listen callback

[PLMTRD]

Expected behaviour The trace_id should change every time a new http request is received.

Actual behaviour A new scope is activated during fastify startup and it will be used for all the next requests, so the trace_id never change.

Steps to reproduce The following code is affected, running fastify with node index.js and making some request to http://0.0.0.0:3299/ shows that the trace_id in the logs never changes.

const tracer = require('dd-trace').init({
  logInjection: true,
  sampleRate: 1,
})
tracer.use('fastify', {
  analytics: true,
  blocklist: ['/alive'],
})

const fastify = require('fastify')

async function run() {
  const app = fastify({
    logger: true,
    disableRequestLogging: false,
  })

  app.register(async (fastify, options, done) => {
    fastify.register(require('fastify-redis'), {
      namespace: 'redis',
      host: '127.0.0.1',
      port: 6379,
      keyPrefix: 'datadog',
      enableAutoPipelining: false,
      lazyConnect: false
    })
  })

  app.get('/', () => {
    return { status: 'OK' }
  })

  // await app.listen(3299, '0.0.0.0')
  app.listen(3299, '0.0.0.0', (err, call) => { })

}

run()

Running fastify with await app.listen(3299, '0.0.0.0') instead app.listen(3299, '0.0.0.0', (err, call) => { }) fix the issue and the trace_id start to change, as expected, on every request.

Another way to fix the issue is to change the lazyConnect to true during fastify-redis registration

Environment

• Node.js version: v16.15.1
• Tracer version: NO
• Agent version: NO
• Relevant library versions:
  • dd-trace: v2.12.2
  • fastify: v3.29.1
  • fastify-redis: v4.3.2

{
  "name": "debug-dd-trace",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "dd-trace": "2.12.2",
    "fastify": "3.29.1",
    "fastify-redis": "4.3.2"
  }
}