@ledgerhq/coin-hedera/lib-es/logic/estimateFees.js

Ledger Hedera Coin integration

import { findCryptoCurrencyById } from "@ledgerhq/cryptoassets/currencies";
import BigNumber from "bignumber.js";
import invariant from "invariant";
import { BASE_USD_FEE_BY_OPERATION_TYPE, DEFAULT_GAS_LIMIT, DEFAULT_GAS_PRICE_TINYBARS, DEFAULT_TINYBAR_FEE, ESTIMATED_FEE_SAFETY_RATE, ESTIMATED_GAS_SAFETY_RATE, HEDERA_OPERATION_TYPES, } from "../constants";
import { apiClient } from "../network/api";
import { getCurrencyToUSDRate, toEVMAddress } from "../network/utils";
const estimateContractCallFees = async ({ configOrCurrencyId, txIntent, }) => {
    let tinybars = new BigNumber(0);
    let gas = new BigNumber(0);
    const tokenEvmAddress = "assetReference" in txIntent.asset ? txIntent.asset.assetReference : null;
    const [senderEvmAddress, recipientEvmAddress] = await Promise.all([
        toEVMAddress({ configOrCurrencyId, accountId: txIntent.sender }),
        toEVMAddress({ configOrCurrencyId, accountId: txIntent.recipient }),
    ]);
    if (!tokenEvmAddress || !senderEvmAddress || !recipientEvmAddress) {
        return {
            tinybars,
        };
    }
    try {
        const [networkFees, gasLimit] = await Promise.all([
            apiClient.getNetworkFees({ configOrCurrencyId }),
            apiClient.estimateContractCallGas({
                configOrCurrencyId,
                senderEvmAddress,
                recipientEvmAddress,
                contractEvmAddress: tokenEvmAddress,
                amount: txIntent.amount,
            }),
        ]);
        const contractCallFees = networkFees.fees.find(fee => fee.transaction_type === HEDERA_OPERATION_TYPES.ContractCall);
        const gasTinybarRate = new BigNumber(contractCallFees?.gas ?? DEFAULT_GAS_PRICE_TINYBARS);
        gas = gasLimit.multipliedBy(ESTIMATED_GAS_SAFETY_RATE).integerValue(BigNumber.ROUND_CEIL);
        tinybars = gas.multipliedBy(gasTinybarRate).integerValue(BigNumber.ROUND_CEIL);
    }
    catch {
        const gasTinybarRate = DEFAULT_GAS_PRICE_TINYBARS;
        gas = DEFAULT_GAS_LIMIT;
        tinybars = gas.multipliedBy(gasTinybarRate).integerValue(BigNumber.ROUND_CEIL);
    }
    return {
        tinybars,
        gas,
    };
};
const estimateStandardFees = async ({ currencyId, operationType, }) => {
    const currency = findCryptoCurrencyById(currencyId);
    invariant(currency, `hedera: currency with id ${currencyId} not found`);
    let tinybars;
    const usdRate = await getCurrencyToUSDRate(currency).catch(() => null);
    if (usdRate) {
        tinybars = new BigNumber(BASE_USD_FEE_BY_OPERATION_TYPE[operationType])
            .dividedBy(new BigNumber(usdRate))
            .integerValue(BigNumber.ROUND_CEIL)
            .multipliedBy(ESTIMATED_FEE_SAFETY_RATE);
    }
    else {
        tinybars = new BigNumber(DEFAULT_TINYBAR_FEE).multipliedBy(ESTIMATED_FEE_SAFETY_RATE);
    }
    return {
        tinybars,
    };
};
export const estimateFees = async (params) => {
    if (params.operationType === HEDERA_OPERATION_TYPES.ContractCall) {
        return estimateContractCallFees({
            configOrCurrencyId: params.configOrCurrencyId,
            txIntent: params.txIntent,
        });
    }
    return estimateStandardFees({
        currencyId: params.currencyId,
        operationType: params.operationType,
    });
};
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