import axios from "axios";
import URI from "urijs";
/* tslint:disable-next-line:no-var-requires */
const 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
* }
*/
export const SERVER_TIME_MAP = {};
const HorizonAxiosClient = axios.create({
headers: {
"X-Client-Name": "js-stellar-sdk",
"X-Client-Version": version,
},
});
function _toSeconds(ms) {
return Math.floor(ms / 1000);
}
HorizonAxiosClient.interceptors.response.use(function interceptorHorizonResponse(response) {
const hostname = URI(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;
});
export default HorizonAxiosClient;
/**
* 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.
*/
export 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;
}
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