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Track server date via headers to avoid drifting. #119

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Track server date via headers to avoid drifting. #119

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21 changes: 19 additions & 2 deletions js/chat.js
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Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,13 @@ if(typeof window!="undefined") {
var x=new XMLHttpRequest();
x.onreadystatechange=function() {
if(x.readyState !== XMLHttpRequest.DONE)return;
cb(null,{statusCode:x.status},x.responseText?JSON.parse(x.responseText):[]);
var headers=x.getAllResponseHeaders().trim().split('\r\n');
var map={}
for(var i=0;i<headers.length;++i) {
headers[i]=headers[i].trim().split(': ');
map[headers[i].shift()]=headers[i].join(': ');
}
cb(null,{statusCode:x.status,headers:map},x.responseText?JSON.parse(x.responseText):[]);
}

x.open(ops.method,ops.uri);
Expand All @@ -21,12 +27,15 @@ else {
}



var LAST_SERVER_DATE=-1;
var API= {
domain_root: "www.hackmud.com",
__promise_wrap:(endpoint,dat) => {
return new Promise( (resolve,reject) => {
request({ method: 'POST', uri: 'https://'+API.domain_root+'/mobile/'+endpoint+'.json', json:dat},
(error,response,body) => {
LAST_SERVER_DATE=new Date(response.headers.date)/1||-1;
if(!error && response.statusCode == 200)
resolve(body)
else {
Expand Down Expand Up @@ -124,7 +133,15 @@ Account.prototype.poll=function(ext={}) {
ext.before=this.last+0.1;
if(ext.after=='last') {
ext.after=this.last-0.1;
var five_min_ago=new Date()/1000 - 300;
var five_min_ago;
if(LAST_SERVER_DATE > 0) {
// if we have a last date from the server, we can use it to ensure we don't drift
five_min_ago=LAST_SERVER_DATE/1000 - 300;
}
else {
// reluctantly use local dates
five_min_ago=new Date()/1000 - 300;
}
if(ext.after < five_min_ago)
ext.after=five_min_ago
}
Expand Down