UMS

Description

A nest js backend

The .env file

USER_LIST_URL="https://randomuser.me/api/?results=10"
MONGO_URI='mongodb://localhost/ums'
REDIS_HOST='localhost'
REDIS_PORT=6379
MINUTE_MODE=false

We can adjust the user data count by changing results's Rvalue value at url. Here I've mentioned all the configuration required to run this application as of now. If the database requires a password configure it accourdingly.

The keyword MINUTE_MODE will run the userfetch action at the start of every minute. Don't set this as true in production

The Three and half hour cron is processed by the epoch time. So this routine will continue till the JS max safe integer which is Number.MAX_SAFE_INTEGER const isnow = Math.floor(new Date().getTime() / 60000) % 210 == 0;

• In the above operation, intially removed the values till seconds, so that we can process from the minutes(by getting integer value from floor operation).
• Now the epoch time is in minutes. If the division with 210 (210 minutes = 3 hours 30 minutes) results remaining of 0 => it is the right time isnow = true to process data since the cron is executed every minutes with above condition( result is in boolean ).

We don't need controller for the application anymore. we can remove it later. To reduce lack of difficulty ( ease ) intefacing purpose it is available now.

Installation

This application requires the installation of nest cli tool globally.

npm i -g @nestjs/cli

The requirement/dependency enviroinment I've used here is, node v21.6.1 (via nvm) redis-server mongo-org

make sure these project dependency is installed and service is running in local or remote accesible server.

# either service or systemctl (some linux standards may not have service)
$ sudo service mongod status
# if service not running start the service
$ sudo service mongod start
# if it not enabled/available in service units
$ sudo systemctl enable mongod && sudo systemctl start mongod

**similarly operations we have to ensure with redis service daemon also

# pre required service dependency
$ sudo apt-get install mongodb-org redis-server
# make sure that right working version of nodejs( and npm) installed before.
# nest global installatio
$ npm i -g @nestjs/cli

change directory (cd) to the ums directory

$ npm install

Running the app

# development
$ npm run start

# watch mode
$ npm run start:dev

# production mode
$ npm run start:prod

building the applicaiton

# To reduce memory and resource allocation
$ npm run build
# To run build
$ node ./dist/main.js  # in project home directory

Test

# unit tests
$ npm run test

# e2e tests
$ npm run test:e2e

# test coverage
$ npm run test:cov