lib/horizon/horizon_axios_client.js

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = exports.SERVER_TIME_MAP = exports.AxiosClient = void 0;
exports.getCurrentServerTime = getCurrentServerTime;
exports.version = void 0;
var _axios = _interopRequireDefault(require("axios"));
var _urijs = _interopRequireDefault(require("urijs"));
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
/* tslint:disable-next-line:no-var-requires */
const version = exports.version = require("../../package.json").version;
/**
 * keep a local map of server times
 * (export this purely for testing purposes)
 *
 * each entry will map the server domain to the last-known time and the local
 * time it was recorded, ex:
 *
 *     "horizon-testnet.stellar.org": {
 *       serverTime: 1552513039,
 *       localTimeRecorded: 1552513052
 *     }
 */
const SERVER_TIME_MAP = exports.SERVER_TIME_MAP = {};
const AxiosClient = exports.AxiosClient = _axios.default.create({
  headers: {
    "X-Client-Name": "js-stellar-sdk",
    "X-Client-Version": version
  }
});
function _toSeconds(ms) {
  return Math.floor(ms / 1000);
}
AxiosClient.interceptors.response.use(function interceptorHorizonResponse(response) {
  const hostname = (0, _urijs.default)(response.config.url).hostname();
  const serverTime = _toSeconds(Date.parse(response.headers.date));
  const localTimeRecorded = _toSeconds(new Date().getTime());
  if (!isNaN(serverTime)) {
    SERVER_TIME_MAP[hostname] = {
      serverTime,
      localTimeRecorded
    };
  }
  return response;
});
var _default = exports.default = AxiosClient;
/**
 * Given a hostname, get the current time of that server (i.e., use the last-
 * recorded server time and offset it by the time since then.) If there IS no
 * recorded server time, or it's been 5 minutes since the last, return null.
 * @param {string} hostname Hostname of a Horizon server.
 * @returns {number} The UNIX timestamp (in seconds, not milliseconds)
 * representing the current time on that server, or `null` if we don't have
 * a record of that time.
 */
function getCurrentServerTime(hostname) {
  const entry = SERVER_TIME_MAP[hostname];
  if (!entry || !entry.localTimeRecorded || !entry.serverTime) {
    return null;
  }
  const {
    serverTime,
    localTimeRecorded
  } = entry;
  const currentTime = _toSeconds(new Date().getTime());

  // if it's been more than 5 minutes from the last time, then null it out
  if (currentTime - localTimeRecorded > 60 * 5) {
    return null;
  }
  return currentTime - localTimeRecorded + serverTime;
}