@vechain.energy/gas/dist/basePrice.js

calculate estimated gas usage for transactions

"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.default = basePrice;
const bent_1 = __importDefault(require("bent"));
const bignumber_js_1 = __importDefault(require("bignumber.js"));
const web3_eth_abi_1 = require("web3-eth-abi");
function basePrice(nodeOrConnex) {
    return __awaiter(this, void 0, void 0, function* () {
        // get base price via HTTP request
        if (typeof nodeOrConnex === "string") {
            const postNode = (0, bent_1.default)(nodeOrConnex, 'POST', 'json', 200);
            const response = yield postNode('/accounts/*', {
                clauses: [{
                        to: '0x0000000000000000000000000000506172616d73',
                        data: '0x8eaa6ac0000000000000000000000000000000000000626173652d6761732d7072696365',
                        value: '0'
                    }]
            });
            if (!Array.isArray(response)) {
                return new bignumber_js_1.default(0);
            }
            const data = response[0].data;
            let decoded = (0, web3_eth_abi_1.decodeParameter)('uint256', data);
            return new bignumber_js_1.default(String(decoded));
        }
        // alternatively, use connex
        const outputs = yield nodeOrConnex.thor
            .account("0x0000000000000000000000000000506172616d73")
            .method({
            "name": "get",
            "type": "function",
            "constant": true,
            "payable": false,
            "stateMutability": "view",
            "inputs": [{ "name": "key", "type": "bytes32" }],
            "outputs": [{ "name": "value", "type": "uint256" }]
        })
            .call('0x000000000000000000000000000000000000626173652d6761732d7072696365');
        return new bignumber_js_1.default(outputs.decoded.value);
    });
}