index.js

'use strict';
require('dotenv').config();
const axios = require('axios');
const aws = require('aws-sdk');
const ses = new aws.SES({ region: 'us-east-1' });

const handler = async (event, context, callback) => {
  try {
    // validate env
    const walletAddress = process.env.WALLET_ADDRESS;
    const alertThreshold = Number(process.env.ALERT_THRESHOLD_PERCENTAGE);
    if (!walletAddress || alertThreshold < 0 || alertThreshold > 100) {
      console.error('environment configured incorrectly');
      return;
    } else {
      console.log(`Alert Threshold: ${alertThreshold}%`);
    }
    // query Compound API
    let response = await axios.get(
      `http://api.compound.finance/api/v2/account?addresses=${process.env.WALLET_ADDRESS}`
    );
    // ensure account accuracy
    const account = response.data.accounts[0];
    if (
      account.address.toUpperCase() != process.env.WALLET_ADDRESS.toUpperCase()
    ) {
      console.error('Account not found');
      return;
    }
    // calculate utilization
    const borrowValue = account.total_borrow_value_in_eth.value;
    const collateralValue = account.total_collateral_value_in_eth.value;
    const utilization = ((borrowValue / collateralValue) * 100).toFixed(2);
    if (utilization < alertThreshold) {
      console.log(`Utilization Okay: ${utilization}%`);
    } else {
      console.log('Sending Mail....');
      return sendAlertMail(utilization);
    }
  } catch (err) {
    console.error(JSON.stringify(err));
  }
};

const sendAlertMail = (utilization) => {
  let params = {
    Destination: {
      ToAddresses: [process.env.GMAIL_USER],
    },
    Message: {
      Body: {
        Text: {
          Data: `UTILIZATION: ${utilization}%`,
        },
      },
      Subject: { Data: '!!COMPOUND ALERT!!' },
    },
    Source: process.env.GMAIL_USER,
  };
  return ses.sendEmail(params).promise();
};

exports.handler = handler;