get-exchangerates.js

import {
    Wallet,
    LocalProvider,
    FileContentsQuery,
    ExchangeRates,
} from "@hashgraph/sdk";

import dotenv from "dotenv";

dotenv.config();

async function main() {
    if (
        process.env.OPERATOR_ID == null ||
        process.env.OPERATOR_KEY == null ||
        process.env.HEDERA_NETWORK == null
    ) {
        throw new Error(
            "Environment variables OPERATOR_ID, HEDERA_NETWORK, and OPERATOR_KEY are required.",
        );
    }

    const provider = new LocalProvider();

    const wallet = new Wallet(
        process.env.OPERATOR_ID,
        process.env.OPERATOR_KEY,
        provider,
    );
    let resp;
    try {
        resp = await new FileContentsQuery()
            .setFileId("0.0.112")
            .executeWithSigner(wallet);
    } catch (error) {
        console.error(error);
    }

    const exchangeRates = ExchangeRates.fromBytes(resp);

    console.log(`Current numerator ${exchangeRates.currentRate.cents}`);
    console.log(`Current denominator ${exchangeRates.currentRate.hbars}`);
    console.log(
        `Current expiration time ${exchangeRates.currentRate.expirationTime.toString()}`,
    );
    console.log(
        `Current Exchange Rate ${exchangeRates.currentRate.exchangeRateInCents}`,
    );

    console.log(`Next numerator ${exchangeRates.nextRate.cents}`);
    console.log(`Next denominator ${exchangeRates.nextRate.hbars}`);
    console.log(
        `Next expiration time ${exchangeRates.nextRate.expirationTime.toString()}`,
    );
    console.log(
        `Next Exchange Rate ${exchangeRates.nextRate.exchangeRateInCents}`,
    );

    provider.close();
}

void main();