Function syncTime

src/syncinfo.js:90–141

(callback)

    };

    var syncTime = function(callback) {
        var srv = 0;
        var next = function() {
            srv++;
            window.setTimeout(run, 1);
        };

        var error = function() {
            _timeoffset = 0;
            console.log('si: time offset  detection failed!');
            if (callback) callback(false);
        };

        var succ = function(t) {
            _timeoffset = t;
            console.log('si: detected a time offset of ' + t + ' ms');
            if (callback) callback(true);
        };

        var run = function() {
            if (srv < _timeservers.length) {
                var o = _timeservers[srv];
                
                var details = {
                    method: o.method,
                    url: o.url,
                };

                var got = function(req) {
                    if (req.readyState == 4) {
                        if (req.status == 200) {
                            var t = o.extract(req.responseText, req.responseHeaders);
                            if (t === null) {
                                next();
                            } else {
                                succ(t);
                            }
                        } else {
                            next();
                        }
                    }
                };

                if (V) console.log('si: determine time offset with server ' + o.url);
                xmlhttpRequest(details, got);
            } else {
                error();
            };
        };

        run();
    };
    
    var registerOnChange = function() {
        if (_registered) return;