运行多个地理编码器回调时出现问题

Question

我目前正试图绕过Node的异步性质。我目前正在试验Geocoder但是我似乎无法找出问题的根源。我当前的快递路由处理程序如图所示

app.get('/:location/:next_location', (req, res) => {
    geocoder.geocode(req.params.location, function ( err, data ) {
        if (err) {
            console.log(err)
        }
        var location1, location2
        location1 = data

        console.log(location1.results[0].geometry)
        geocoder.geocode(req.params.next_location, function (err, data) {
            if (err) {
                console.log(err)
            }
            location2 = data

            console.log(location2.results[0].geometry)
        });
        res.send('Ok')
    });
});

当我点击这条路线时，我正在

/Users/dannyxxx/Desktop/react/node-yelp/server.js:47
            console.log(location2.results[0].geometry)
                                            ^

TypeError: Cannot read property 'geometry' of undefined

提前谢谢

更新

function geocodePromise(data){
    return new Promise(function(resolve, reject){
        geocoder.geocode(data, function (err, data) {
        if (data) { resolve(data) }
        })
    })
}

var points = {}
    geocodePromise(req.params.location)
    .then((data)=> {
        points.location1 = data.results[0].geometry.location
        return geocodePromise(req.params.next_location)
    })
    .then(data => {
        points.location2 = data.results[0].geometry.location
    })