Parent function is not waiting for child to finish - node.js

Question

Inside getMetadata(), Object.keys function is not waiting for httprequest to finish. How can I make object.keys function to wait till httprequest function manipluates the result variable?
I'm using node. I tried to make promise but failed.
function fetchAirportPageIDsListWithMetaJSON(faa, cb){
logger.info('[airportcms-data-processor] fetching airport pages list with Metadata');
var faa = faa
async.waterfall([
getAirportPageIDsList,
getMetadata,
], function (err, result) {
cb(null, result);
});
function getAirportPageIDsList(callback) {
httpRequests.fetchData('//s3 url to fetch data', function (err, data) {
var idsMap={};
data["page-ids"].forEach( (obj) => {
obj.list.forEach((item) => idsMap[item] = obj.id);
});
callback(null, idsMap);
})
}
function getMetadata(data,callback) {
var result=[];
Object.keys(data).sort().forEach( function (t) {
var tempJson={};
var urlcheck = verifySpecialPageId(t);
if (urlcheck){
var url = config.urls.s3_airports_base_url+'/'+faa+'/'+urlcheck;
}else{
var url = config.urls.s3_airports_base_url+'/'+faa+'/'+t;
}
tempJson["sectionId"]= t;
tempJson["page"]= data[t];
httpRequests.makeHeadRequestWithCallerId(url, function (err, metax) {
if (metax){
let z = metax.split('|')[0];
tempJson["SummaryRange"]= getSummaryRangeAirportPageList(z);
tempJson["timestamp"]= new Date(parseInt(z)).toLocaleDateString();
tempJson["callerId"]= metax.split('|')[1];
}else{
tempJson["timestamp"]='';
tempJson["callerId"]='';
tempJson["SummaryRange"]='';
}
})
result.push(tempJson);
});
logger.info("Final result: ", result);
callback(null, result);
}
}
http request function:
function makeHeadRequestWithCallerId (url, cb) {
httpRequest.head(url, function (err, res) {
if (err) {
logger.error('Error ' + err);
return cb(err, null);
}
if(res.code === 200) {
if (res.headers['x-amz-meta-x-amz-meta-lastmodified'] || res.headers['x-amz-meta-x-amz-meta-callerid']) {
var dateModified = res.headers['x-amz-meta-x-amz-meta-lastmodified'];
var timeStamp = Date.parse(dateModified);
var callerid = res.headers['x-amz-meta-x-amz-meta-callerid'];
if(timeStamp && callerid) {
return cb(null, timeStamp+'|'+callerid);
} else if (callerid){
return cb(null, '|'+callerid);
}else if(timeStamp){
return cb(null, timeStamp+'|');
}else{
return cb(null, null);
}
}else{
return cb(null, null);
}
}
});
}
Current log=> Final result:
[{ sectionId: 'internet-wifi', page: 'internet-wifi' },
{ sectionId: 'layover-ideas', page: 'layover-ideas' }]
Expected log=> Final result:
{ sectionId: 'internet-wifi',
page: 'internet-wifi',
SummaryRange: '12-99',
timestamp: '1/29/2018',
callerId: '' },
{ sectionId: 'layover-ideas',
page: 'layover-ideas',
SummaryRange: '12-99',
timestamp: '1/26/2017',
callerId: '' },

Answer 1

function getMetadata(data, callback) {
var result = [];
var count = Object.keys(data).length;
var i = 0;
Object.keys(data).sort().forEach(function (t) {
var tempJson = {};
var urlcheck = verifySpecialPageId(t);
if (urlcheck) {
var url = config.urls.s3_airports_base_url + '/' + faa + '/' + urlcheck;
} else {
var url = config.urls.s3_airports_base_url + '/' + faa + '/' + t;
}
tempJson["sectionId"] = t;
tempJson["page"] = data[t];
httpRequests.makeHeadRequestWithCallerId(url, function (err, metax) {
if (metax) {
let z = metax.split('|')[0];
tempJson["SummaryRange"] = getSummaryRangeAirportPageList(z);
tempJson["timestamp"] = new Date(parseInt(z)).toLocaleDateString();
tempJson["callerId"] = metax.split('|')[1];
} else {
tempJson["timestamp"] = '';
tempJson["callerId"] = '';
tempJson["SummaryRange"] = '';
}
result.push(tempJson);
i++;
if(count === i){
logger.info("Final result: ", result);
callback(null, result);
}
})
});
}