Node Redis SocketClosedUnexpectedlyError Socket closed unexpectedly

JavaScript
1

Hi! We just set up redis on fly.io via this tutorial.

We are consistently seeing this error:

2023-07-17T03:56:09Z app[91857315f11298] sjc [info]Redis Client Error SocketClosedUnexpectedlyError: Socket closed unexpectedly
2023-07-17T03:56:09Z app[91857315f11298] sjc [info]    at Socket.<anonymous> (/home/node/node_modules/@redis/client/dist/lib/client/socket.js:195:118)
2023-07-17T03:56:09Z app[91857315f11298] sjc [info]    at Object.onceWrapper (node:events:627:26)
2023-07-17T03:56:09Z app[91857315f11298] sjc [info]    at Socket.emit (node:events:512:28)
2023-07-17T03:56:09Z app[91857315f11298] sjc [info]    at Socket.emit (node:domain:489:12)
2023-07-17T03:56:09Z app[91857315f11298] sjc [info]    at TCP.<anonymous> (node:net:334:12)
2023-07-17T03:56:09Z app[91857315f11298] sjc [info]Connected!

The client connects again soon after but not before our server returns an error response on the incoming HTTP request.

Question: Is the socket closing expected behavior (and I need to ping the redis client periodically to keep the connection alive), or am I missing something in the setup?

Setup:

We are connecting to redis deployed on fly.io with node also on fly.io
redis.ts:

import { createClient } from 'redis';

const redisClient = createClient({
  url: process.env.REDIS_URL,
  # REDIS_URL='redis://default:password@fly-kino-redis-dev.upstash.io'
  socket: {
    family: 6
  }
});

redisClient.on('error', err => console.log('Redis Client Error', err));
redisClient.on('connect', () => console.log('client is connect'));
redisClient.on('reconnecting', () => console.log('client is reconnecting'));
redisClient.on('ready', () => { console.log('Connected!'); });
  
export default redisClient

export function closeInstance() {
  redisClient.quit()
}

and in our server.ts:

import app from './app' # all other app setup & routing done here
import redisClient from './redis';
const port = process.env.PORT || 3000;

(async () => {
  await redisClient.connect();
})();

app.listen(port, () => console.log(`Hello World! We are on port ${port}!!`))

redis package version:

"redis": "^4.6.7",
2

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