Await function to finish calling another API - node.js

Question

I am new to using async/await and having a couple issues.
I have the code below, which seems to not wait until the previous function is finished?
var url = require('url');
var path = require('path');
var https = require('https');
var request = require('request');
var url1 =
var url2 =
var url3 =
module.exports = async function (context, req) {
var call = await callUrl(context, url1);
context.log(call);
var call2 = await callUrl(context, url2);
context.log(call2);
var call3 = await callUrl(context, url3);
context.log(call3);
};
function callUrl (context, web) {
var requestUrl = url.parse(web);
const requestOptions = {
hostname: requestUrl.hostname,
path: requestUrl.path,
method: 'POST',
headers: {
'Content-Type': 'application/json'
}
};
var request = https.request(requestOptions, function(res) {
var data = "";
res.on('data', function (chunk) {
data += chunk;
});
res.on('end', function () {
var jsonData = JSON.parse(data);
return jsonData;
});
}).on('error', function(error) {
context.log("request error:", error);
return context.done();
});
request.end();
}
I am trying to get call to happen, then when it is finished call2, then when that is finished call3.
Can someone pinpoint why this does not occur? Currently, it hits all 3 pretty much asap, and each context.log is undefined presumably because the endpoints don't return anything. Each url is another azure function app API I have created.
There is nothing I am requiring to return from each call to use, I simply want them to finish before moving on the the next function.

Answer 1

Your callUrl method, which you call with await, needs to be either async itself or return a Promise. Why? because the work it does is itself asynchronous.
Here's your function adapted to use a Promise and return its actual value via the resolve() callback.
function callUrl (context, web) {
var requestUrl = url.parse(web);
const requestOptions = {
hostname: requestUrl.hostname,
path: requestUrl.path,
method: 'POST',
headers: {
'Content-Type': 'application/json'
}
};
return new Promise(function (resolve,reject) {
var request = https.request( requestOptions, function( res ) {
var data = "";
res.on( 'data', function( chunk ) {
data += chunk;
} );
res.on( 'end', function() {
var jsonData = JSON.parse( data );
resolve( jsonData );
} );
} )
.on( 'error', function( error ) {
reject(error);
} );
request.end();
});
}
Notice that you use a POST operation with no body. That's a little unconventional.