@q-dev/q-js-sdk/lib/utils/fee-calculation.js

Typescript Library to interact with Q System Contracts

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.FeeCalculation = void 0;
const IFxPriceFeedInstance_1 = require("../contracts/defi/oracles/IFxPriceFeedInstance");
const bn_js_1 = __importDefault(require("bn.js"));
const ContractRegistryInstance_1 = require("../contracts/ContractRegistryInstance");
class FeeCalculation {
    constructor(signerOrProvider) {
        this.signerOrProvider = signerOrProvider;
    }
    async lazyInit() {
        if (this.qfiParams)
            return;
        const registry = new ContractRegistryInstance_1.ContractRegistryInstance(this.signerOrProvider);
        this.qfiParams = await registry.epqfiParameters();
    }
    async calculateGasPrice() {
        try {
            await this.lazyInit();
        }
        catch (e) {
            console.log(`Cannot initialize fee calculater: ${e}`);
            return this.getDefaultGasPrice();
        }
        let txFee = new bn_js_1.default(0);
        try {
            txFee = new bn_js_1.default(await this.qfiParams.getUint('governed.EPQFI.txFee'));
        }
        catch (e) {
            console.log(`Cannot determine transaction fee: ${e}`);
            return this.getDefaultGasPrice();
        }
        let oracleAddress;
        try {
            oracleAddress = await this.qfiParams.getAddr('governed.EPQFI.Q_QUSD_source');
        }
        catch (e) {
            console.log(`Cannot determine oracle address: ${e}`);
            return this.getDefaultGasPrice();
        }
        const priceFeed = await new IFxPriceFeedInstance_1.IFxPriceFeedInstance(this.signerOrProvider, oracleAddress);
        let exchangeRateRaw = '0';
        try {
            exchangeRateRaw = await priceFeed.exchangeRate();
        }
        catch (e) {
            console.log(`Cannot determine exchangeRate: ${e}`);
        }
        if (exchangeRateRaw == '0') {
            console.log('Exchange rate is zero');
            return this.getDefaultGasPrice();
            // console.log('Exchange rate is zero. Continue with 1:1, instead')
            // exchangeRateRaw = '1e+18'
        }
        let txSize = new bn_js_1.default(0);
        try {
            txSize = new bn_js_1.default(await this.qfiParams.getUint('governed.EPQFI.normalizedTransactionSize'));
        }
        catch (e) {
            console.log('Cannot get normalized txSize');
            return this.getDefaultGasPrice();
        }
        const exchangeRate = new bn_js_1.default(exchangeRateRaw);
        const gp = txFee.mul(new bn_js_1.default(1e+18)).div(exchangeRate).div(txSize).toString();
        return Number(gp);
    }
    async getDefaultGasPrice() {
        return (await this.signerOrProvider.getGasPrice()).toNumber();
    }
}
exports.FeeCalculation = FeeCalculation;
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