Problem Extractor

Leetcode Roulette service that runs scheduled jobs to get Leetcode problem data from the Leetcode APIs.

Getting Started

To get started running the Problem Extractor service locally, clone the repository to your local machine and change to the project root directory. Next, make sure to make the needed configurations and run npm install to get the needed packages for the project. Next, build and run the project with npm run build followed by npm start respectively.

git clone https://github.com/leetcode-roulette/problem-extractor.git
cd problem-extractor

This will add the project to a new problem-extractor directory and change into the directory.

npm install
npm run build
npm start

This will install the required dependencies on your local machine followed by building the source code to a dist folder and running the server code in the dist/index.js file.

Prerequisites

Before running the Problem Extractor service locally, the following steps will need to be taken to ensure the needed software will be installed or set up.

• Install npm and NodeJS
• Install MongoDB or MongoDB Atlas and setup using the provided instructions

Initial Configuration

Before starting, you'll need to configure the mongoose database connection string. This can be done by creating a .env file in the root directory of the project. In the .env file, be sure to specify a connection string named MONGO_CONNECTION_STRING.

Examples:

• MONGO_CONNECTION_STRING: "mongodb://localhost:27017/myDB"

Developing

To begin development on this project, clone the repository to your local machine and change to the project root directory. Next, make sure to make the needed configurations and run npm install to get the needed packages for the project. Finally, run the npm run dev command to deploy a local development environment on your local machine.

git clone https://github.com/leetcode-roulette/problem-extractor.git
cd problem-extractor
npm install
npm run dev

This will spin up a nodemon server using the server code in the src/index.ts file.

Building

To build the project, run the npm run build command.

npm run build

This will compile the typescript in the src folder and create a new dist folder consisting of built Javascript code.

Testing

To test the project, run the npm run test command.

npm run test

This will run the tests in any file in the src directory following the specified formats.

• "**/tests/**/*.spec.ts"
• "**/tests/**/*.test.ts"

Features

This project sets up a cron job to receieve and populate a database with problems from leetcode.

Configuration

The following configurations can be specified in a .env file.

MONGO_CONNECTION_STRING

Type: String Default: None

Specifies mongodb database uri for mongoose to connect to.

mongoose.connect(MONGO_CONNECTION_STRING); // Connects to the provided uri

CRON_EXPRESSION

Type: String Default: '0 * * * *'

Specifies how often the cronjob should run.

new CronJob(process.env.CRON_EXPRESSION || "0 * * * *"); // Runs at the start of every hour by default

TIMEZONE

Type: String Default: 'UTC'

Specifies the timezone that the cronjob should use.

cron.schedule(cronExpression, this.job, {
  timezone: process.env.TIMEZONE || "UTC",
});

PORT

Type: Integer Default: 3000

Specifies which port the server will run on.

app.listen(PORT, () => {
  logger.info(`Server is listening on port ${PORT}`); // Log the port the application is being run on
});

VERSION

Type: String Default: '1.0.0'

Specifies the current version of the project.

ENVIRONMENT

Type: String Default: 'dev'

Specifies the environment that is being used.

res.status(200).json({
  version: VERSION,
  environment: ENVIRONMENT,
  status: "Live"
});

Built With

• NodeJS - Node.js is an open-source, cross-platform, JavaScript runtime environment that executes JavaScript code outside a web browser.
• MongoDB - MongoDB is a source-available cross-platform document-oriented database program.
• Typescript - TypeScript is a free and open source programming language developed and maintained by Microsoft.