javascript - 在 Dialogflow 中返回 Promise 输出

Question

我的问题是，在 Dialogflow 中，我的意图调用了调用方法的 webhook。 当所有 console.logs 工作时，方法“CheckCosts”正在运行。 但是 webhook 没有从“CheckCosts”方法的输出中检索任何内容。

下面是网络钩子(Hook)。这是在提交意图时调用的 webhook。

function checkCostsIntent(app) {
    let origin = parameter.originAddress;
    let destination = parameter.destinationAddress;
    let costString = '';

    /*let testing = CheckCosts(origin, destination);
    app.add(testing);*/

    CheckCosts(origin, destination).then((cost)=>{
        console.log(cost);
        costString = cost;
    });

    app.add(costString);
}

下面是 webhook 将调用的方法。

function CheckCosts(originAddress, destinationAddress) {
    return new Promise((resolve, reject) => {

        let defaultPath = 'maps.googleapis.com/maps/api/distancematrix/json?units=metric';
        let APIKey = '&key=<API KEY>';
        let origin = originAddress;
        let destination = destinationAddress;
        let newPath = defaultPath + '&origins=' + origin + '&destinations=' + destination + APIKey;
        let url = 'https://' + newPath;
        console.log(url);

        https.get(url, (res) => {
            let body = '';
            res.on('data', (d) => { body += d; }); // store each response chunk
            res.on('end', () => {
                let response = JSON.parse(body);
                console.log(response);

                let distance = response.rows[0].elements[0].distance.text;
                let travelTime = response.rows[0].elements[0].duration.text;
                let distanceValue = response.rows[0].elements[0].distance.value;
                let travelTimeValue = response.rows[0].elements[0].duration.value;

                var ref = database.ref().child('price');
                return ref.once('value').then(function (snapshot) {
                    let baseFair = snapshot.child('base').val();
                    let perKm = snapshot.child('perKm').val();
                    let perMin = snapshot.child('perMin').val();

                    let distanceCost = distanceValue / 1000 * perKm;
                    let timeCosts = travelTimeValue / 60 * perMin;

                    let cost = baseFair + distanceCost + timeCosts;
                    cost = cost.toFixed(2);

                    console.log('Total costs of distance is $' + distanceCost);
                    console.log('Total costs of time is $' + timeCosts);
                    console.log('The total cost of the ride is $' + cost);
                    let output = 'Distance between ' + origin + ' and ' + destination + ' is ' + distance + '. Time taken is ' + travelTime + '. And the total cost of the ride is $' + cost;

                    console.log(output);
                    resolve(output);
                },
                function (error) {
                    console.log('error' + error.code);
                });

            });
            response.on('error', (error) => {
                console.log(`error calling the Distance Matrix API:' ${error}`);
                reject('fail');
            });
        });
    });
}

基本上主要的问题是我没有在我的 webhook 中得到 resolve(output) 因为我从我的 中的 console.log() 什么也得不到checkCostsIntent() 网络钩子(Hook)。

我的返回 promise 有问题吗？ 还是我的决心？

Answer 1

没关系。我只需要在我的代码前面添加“return”

return CheckCosts(origin, destination).then((cost)=>{
    app.add(cost);
});

它有效