AVV_ERR_READY_TIMEOUT when connecting to an IPv6 Redis instance

[ChristoPy]

Prerequisites

• [X] I have written a descriptive issue title
• [X] I have searched existing issues to ensure the bug has not already been reported

Fastify version

4.0.0

Plugin version

6.1.0

Node.js version

16

Operating system

Linux

Operating system version (i.e. 20.04, 11.3, 10)

20.04

Description

I cannot connect to an IPv6 Redis instance.

My Redis instance in production uses IPv6, so for this I changed the connection options to use family: 6. Which works nicely pointing to my local environment. But if I point to the production Redis instance, the following error shows up:

AvvioError [Error]: Plugin did not start in time: '@fastify/redis'. You may have forgotten to call 'done' function or to resolve a Promise
    at Timeout._onTimeout (/.../node_modules/avvio/plugin.js:122:19)
    at listOnTimeout (node:internal/timers:557:17)
    at processTimers (node:internal/timers:500:7) {
  code: 'AVV_ERR_READY_TIMEOUT',
  fn: <ref *1> [Function: fastifyRedis] {
    default: [Circular *1],
    fastifyRedis: [Circular *1],
    [Symbol(skip-override)]: true,
    [Symbol(fastify.display-name)]: '@fastify/redis',
    [Symbol(plugin-meta)]: { fastify: '4.x', name: '@fastify/redis' }
  }
}

README mentions that it is normal and it will not fail silently. I could be using a wrong config here.

But strangely, if I connect directly using ioredis with the exact same configs it works normally.

Steps to Reproduce

My Redis plugin:

import fp from 'fastify-plugin'
import fastifyRedis, { FastifyRedisPluginOptions, FastifyRedis } from '@fastify/redis'

/**
 * This plugin adds a redis client to the fastify instance
 */
export default fp<FastifyRedisPluginOptions>(async (fastify, opts) => {
  fastify.register(fastifyRedis, {
    host: process.env.REDIS_HOST,
    port: Number(process.env.REDIS_PORT),
    password: process.env.REDIS_PASSWORD,
    family: 6,
  })
})

// update fastify namespace to include redis
declare module 'fastify' {
  interface FastifyInstance {
    redis: FastifyRedis
  }
}

The API is the TypeScript boilerplate generated with Fastify CLI.

Expected Behavior

I expected to be able to connect using the option family:6 which can be done in another service using plain ioredis with the exact same configs.

[mcollina]

Unfortunately I don't have an ipv6 redis instance available, but I suspect it's something to do with the ready event not being emitted for whatever reason.

[mcollina]

Would you like to send a PR?

[ChristoPy]

Yes, I will

[ChristoPy]

@mcollina There are a few people complaining about it on ioredis. Seems like redis can't resolve the DNS even using family: 6.

My mistake, I could've checked it directly on ioredis before opening this issue. I'll close it here, since there is no problem with the plugin.