@ledgerhq/live-common
Version:
Common ground for the Ledger Live apps
60 lines • 1.95 kB
JavaScript
import { FeeEstimationFailed } from "@ledgerhq/errors";
import { makeLRUCache } from "@ledgerhq/live-network/cache";
import network from "@ledgerhq/live-network";
import { BigNumber } from "bignumber.js";
import invariant from "invariant";
import { blockchainBaseURL } from "@ledgerhq/coin-bitcoin/explorer";
const getEstimatedFees = makeLRUCache(async (currency) => {
const baseURL = blockchainBaseURL(currency);
invariant(baseURL, `Fees for ${currency.id} are not supported`);
const { data, status } = await network({
method: "GET",
url: `${baseURL}/fees`,
});
if (data) {
return data;
}
throw new FeeEstimationFailed(`FeeEstimationFailed ${status}`, {
httpStatus: status,
});
}, c => c.id);
export const speeds = new Map([
[1, "fast"],
[3, "medium"],
[6, "slow"],
]);
export const defaultBlockCount = 3;
/**
* Returns the current network fee rate(fast, medium, slow) from our backend for a given currency
*/
export const getFeeItems = async (currency) => {
const all = [];
const fees = await getEstimatedFees(currency);
let defaultFeePerByte = new BigNumber(0);
for (const key of Object.keys(fees)) {
const feePerByte = new BigNumber(Math.ceil(fees[key] / 1000));
const blockCount = parseInt(key, 10);
if (blockCount === defaultBlockCount)
defaultFeePerByte = feePerByte;
if (!Number.isNaN(blockCount) && !feePerByte.isNaN() && speeds.has(blockCount)) {
all.push({
key,
speed: speeds.get(blockCount),
blockCount,
feePerByte,
});
}
}
const items = all
.sort((a, b) => a.blockCount - b.blockCount)
.map(({ key, speed, feePerByte }) => ({
key,
speed,
feePerByte,
}));
return {
items,
defaultFeePerByte,
};
};
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