jka-core/lib/requests/basic.request.js

Library for working with Jedi Academy servers

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.basicRequest = void 0;
const dgram_1 = require("dgram");
const getIpAndPort_validator_1 = require("../validation/getIpAndPort.validator");
const constants_1 = require("../constants");
/**
 *
 * @param params Object with keys:
 * request - request to the server,
 * ip - ip or domain name of the server
 * port - port (number 1-65534)
 * timeout - timer in secs after which request would be interrupted (min: 2, default: 10)
 * @returns string with server response or throws an error
 */
const basicRequest = (params) => {
    const { ip, port, timeout, request } = validateAndParseInput(params);
    return new Promise((resolve, reject) => {
        const packet = Buffer.from(`\xFF\xFF\xFF\xFF${request}`, 'latin1');
        const socket = (0, dgram_1.createSocket)('udp4');
        let isSocketClosed = false;
        const msg = [];
        const listener = (response) => msg.push(response.toString());
        const connection = socket.once('message', (response) => {
            msg.push(response.toString());
            // Coming below is required because response can come as a load of packets, not just one
            socket.on('message', listener);
            setTimeout(() => {
                connection.off('message', listener);
                if (!isSocketClosed)
                    socket.close();
                resolve(msg.join(''));
            }, 2000);
        });
        socket.on('error', (err) => {
            console.error('jka-core basic request error: ', err);
            if (!isSocketClosed)
                socket.close();
            reject('No response!');
        });
        socket.on('close', () => {
            isSocketClosed = true;
        });
        socket.send(packet, 0, packet.length, port, ip);
        setTimeout(() => {
            connection.off('message', listener);
            if (!isSocketClosed)
                socket.close();
            reject('No response!');
        }, timeout * 1000);
    });
};
exports.basicRequest = basicRequest;
function validateAndParseInput(params) {
    const noParams = [];
    if (!params.server)
        noParams.push('server');
    if (!params.request)
        noParams.push('request');
    if (noParams.length > 0)
        throw new Error('Parameter "ip" is required!');
    if (params.timeout && params.timeout < constants_1.MIN_REQUEST_TIMEOUT)
        throw new Error('Parameter "timeout" must be at least 1 second!');
    const { ip, port } = (0, getIpAndPort_validator_1.getIpAndPort)(params.server);
    const timeout = (params === null || params === void 0 ? void 0 : params.timeout) || constants_1.DEFAULT_REQUEST_TIMEOUT;
    return { ip, port, timeout, request: params.request };
}