@opentarot/core/src/api/cycles.ts

A typescript interface for the open tarot ecosystem.

// Querying the cycles minting canister.

import { IcpXdrConversionResponse } from '../idl/cycles.did.d';
import { CacheConf } from './_common';
import { cycles } from './actors';

//////////////
// Mapping //
////////////

// Map ICP -> XDR conversion rate response into 1 normalized float.
function mapIcpXdrConversion(input: IcpXdrConversionResponse): number {
    return Number(input.data.xdr_permyriad_per_icp) / 10_000;
}

///////////////
// Fetching //
/////////////

// Retrieve the conversion rate of cycles to XDR.
export async function fetchCyclesToXdr() {
    // Get ICP to USD exchange rate
    return cycles.get_icp_xdr_conversion_rate().then(mapIcpXdrConversion);
}

// Retrieve conversion rate of XDR to USD.
export async function fetchXdrToUsd() {
    return fetch(
        'https://free.currconv.com/api/v7/convert?q=XDR_USD&compact=ultra&apiKey=df6440fc0578491bb13eb2088c4f60c7'
    )
        .then(r => r.json())
        .then(r => (r.hasOwnProperty('XDR_USD') ? r.XDR_USD : 1.4023));
}

export const conversionCacheConf: CacheConf = {
    cacheTime: 60_000 * 60 * 24 * 365,
    staleTime: 60_000 * 20,
};