middleware before email appender selected

[PinkyRabbit]

Hello. I got an issue.

I try to use log4js-node + smtp in public project. I created module for my logger:

const log4js = require('log4js');
const path = require('path');
const config = require('../config/config');

const FILENAME = path.resolve(__dirname, '../errors.log');

log4js.configure({
  appenders: {
    out: {
      type: 'stdout',
    },
    toFile: {
      type: 'file',
      filename: FILENAME,
    },
    email: {
      type: 'smtp',
      recipients: config.email.me,
      transport: 'SMTP',
      SMTP: {
        host: 'smtp.gmail.com',
        port: '465',
        secure: true,
        sender: config.email.login,
        auth: {
          user: config.email.login,
          pass: config.email.password,
        },
      },
    },
  },
  categories: {
    default: {
      appenders: ['out'],
      level: 'debug',
    },
    dev: {
      appenders: ['out'],
      level: 'debug',
    },
    forErrors: {
      appenders: ['toFile', 'email'],
      level: 'error',
    },
  },
});

const useLogger = config.env === 'production' ? 'forErrors' : 'dev';
const logger = log4js.getLogger(useLogger);

module.exports = logger;

The problem is: because this is public project I cant select recipients by hands. I need to make a request to my database ( I use mongodb/mongoose) to grab superusers emails. How I can do this? How I can get all superadmins before send errors with logger's smtp. Thanks!

[nomiddlename]

You're going to have to get the email addresses from the database before you configure log4js. If you're concerned about missing errors before log4js is configured, or errors when trying to contact the database to get the emails, then configure log4js to log to console (or a default email address) and then do a log4js.shutdown followed by a log4js.configure.

[PinkyRabbit]

@nomiddlename thank you for response. But superadmins can be changed. And if I'll configured it on module init, then I can change it only if config will be as separate object?

[nomiddlename]

When super admins change you'll have to call log4js.shutdown and then log4js.configure again. At the moment, there's no other way of changing the email recipients.

[nomiddlename]

Closing this one, as I don't think there's anything to be fixed here (and it would need to be done in log4js core anyway).