giveth-bridge/lib/gasPrice.js

Mainnet -> sidechain Giveth Bridge.

'use strict';

Object.defineProperty(exports, "__esModule", {
    value: true
});

var _requestPromise = require('request-promise');

var _requestPromise2 = _interopRequireDefault(_requestPromise);

var _web = require('web3');

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

var FIVE_MINUTES = 1000 * 60 * 5;

var lastChecked = Date.now() - FIVE_MINUTES - 1;
var lastPrice = 1000000000;

var queryGasStation = function queryGasStation() {
    if (Date.now() > lastChecked + FIVE_MINUTES) {
        return (0, _requestPromise2.default)('https://ethgasstation.info/json/ethgasAPI.json').then(function (resp) {
            var _JSON$parse = JSON.parse(resp),
                average = _JSON$parse.average;

            lastPrice = _web.utils.toWei('' + average / 10, 'gwei'); // response in gwei * 10
            lastChecked = Date.now();
            return lastPrice;
        }).catch(function (e) {
            console.error('could not fetch gas from ethgasstation', e);
            return lastPrice;
        });
    }

    return Promise.resolve(lastPrice);
};

exports.default = function (config) {
    var homeNetwork = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : true;

    var gasPrice = homeNetwork ? config.homeGasPrice : config.foreignGasPrice;

    if (gasPrice === 'ethGasStation') {
        return queryGasStation();
    }

    return Promise.resolve(gasPrice);
};