sol-mem-gen/cache.ts

import assert from "assert";
import BN from "bn.js";
import fetch from 'node-fetch';

let cachedQuotes: BN[] = [];

assert(process.env.NEXT_PUBLIC_USDC_MINT, 'USDC_MINT is required');
assert(process.env.NEXT_PUBLIC_MTM_TOKEN_MINT, 'MTM_TOKEN_MINT is required');

const MTM_TOKEN_MINT = process.env.NEXT_PUBLIC_MTM_TOKEN_MINT;
const USDC_MINT = process.env.NEXT_PUBLIC_USDC_MINT;

export async function fetchAndCacheQuotes(): Promise<void> {
  try {
    const url = `https://api.jup.ag/price/v2?ids=${USDC_MINT}&vsToken=${MTM_TOKEN_MINT}`;
    const response = await fetch(url);

    if (!response.ok) {
      throw new Error(`Failed to fetch quote: ${response.statusText}`);
    }

    const quoteResponse = await response.json();
    const priceFromAPI = Number(quoteResponse['data'][USDC_MINT]['price']).toFixed(6);
    const price = new BN(priceFromAPI.toString().replace('.', ''));

    cachedQuotes.push(price);
    if (cachedQuotes.length > 3) {
      cachedQuotes.shift();
    }
  } catch (error) {
    console.error('Error fetching quotes:', error);
  }
}

export function getLatestQuote(): BN | undefined {
  return cachedQuotes[cachedQuotes.length - 1];
}