This is a Next.js project bootstrapped with create-next-app.

Getting Started

Run the docker compose

docker compose up

Export the database url to the environment

    export DATABASE_URL="postgres://postgres:postgres@localhost:5005/postgres"

Create a metamask wallet and add bloxberg network using the following credentials:

• RPC URL: https://core.bloxberg.org
• ChainID: 8995
• Currency symbol: bloxberg

NOTE

Add your public key to the internalAccess array within utils/constants

Run the development server:

npm run dev
# or
yarn dev
# or
pnpm dev

Open http://localhost:3000 with your browser to see the result.

You can start editing the page by modifying pages/index.js. The page auto-updates as you edit the file.

API routes can be accessed on http://localhost:3000/api/hello. This endpoint can be edited in pages/api/hello.js.

The pages/api directory is mapped to /api/*. Files in this directory are treated as API routes instead of React pages.

This project uses next/font to automatically optimize and load Inter, a custom Google Font.

Cron Job for API Call in Docker Container

Overview

This project contains a cron job that periodically calls an API to update validator details. The cron job is implemented in a Docker container and is scheduled to run every 5 minutes. Below is a detailed explanation of the setup.

Cron Job Setup

The cron job is defined in the crontab file and is scheduled to run every 5 minutes:

*/5 * * * * /validator_dapp/callApi.sh 2>> /validator_dapp/logg.log

This command executes the callApi.sh script, which triggers a Node.js script that sends a POST request to the validator update API. Any errors encountered during execution are logged into logg.log.

Dockerfile Setup

The cron job is copied into the Docker container using the following command in the Dockerfile.

COPY crontab /etc/crontabs/root

This ensures that the cron job is configured when the Docker container is built.

API Call Script

The cron job executes a shell script (callApi.sh) which triggers the following Node.js code to make a POST request to the specified API endpoint.

process.env.NODE_TLS_REJECT_UNAUTHORIZED = '0';

const axios = require('axios');


const callApi = async () => {

    try {

        const response = await axios.post('https://bloxberg-qa-traefik.mpdl.mpg.de/api/update-validators-details');

        console.log('API called successfully:', response.data);

    } catch (error) {

        console.log('Error calling API:', error);

    }

};


callApi();

Note: SSL certificate verification is disabled for testing purposes by setting process.env.NODE_TLS_REJECT_UNAUTHORIZED = '0'. This should be removed in production.

Learn More

To learn more about Next.js, take a look at the following resources:

• Next.js Documentation - learn about Next.js features and API.
• Learn Next.js - an interactive Next.js tutorial.

You can check out the Next.js GitHub repository - your feedback and contributions are welcome!