Custom widget for NLP

NTP

Time is an important point in our system. We have to keep synchronization between each services to ensure consistency regarding logging, tracking, ... We are using ntp-time-sync to do that and we have to configure the ntp server pool as a comma separated string in the env NTP_SERVER_POOL=0.pool.ntp.org,1.pool.ntp.org,2.pool.ntp.org. This information is read at the startup and a clock perform synchronisation at a frequency defined in the configuration NTP_SYNC_DELAY=5000 (the duration is in milliseconds). ntp-time-sync

Timesync between node may be manage using a peer to peer approach. timesync.

Timezone

We are using moment and moment-timezone to manage date. The timezone is provided through the env var SERVER_TIMEZONE. We are initializing date using this kind of code

const moment = require('moment-timezone');
//...
const {SERVER_TIMEZONE} = process.env;
//...
function getDate(config) {
  return moment().tz(config['SERVER_TIMEZONE']).format();
}
//...

moment-timezone & moment

Env

Current configuration of the env

HOST=0.0.0.0
PORT=5432
INDEX_NAME=ratings
ELASTIC_URL=http://localhost:9200
ELASTIC_USERNAME=
ELASTIC_PASSWORD=
NTP_SYNC_DELAY=5000
SERVER_TIMEZONE=Europe/Zurich

If ELASTIC_USERNAME or ELASTIC_PASSWORD is empty, no auth will be used for elasticsearch.