Question

我正在尝试从Firebase函数调用其他API，这些服务器是Google上的Actions的实现。

我尝试了以下方法：

const { dialogflow } = require('actions-on-google');
const functions = require('firebase-functions');
const http  = require('https');
const host = 'wwws.example.com';

const app = dialogflow({debug: true});

app.intent('my_intent_1', (conv, {param1}) => {

         // Call the rate API
        callApi(param1).then((output) => {
            console.log(output);
            conv.close(`I found ${output.length} items!`); 
        }).catch(() => {
            conv.close('Error occurred while trying to get vehicles. Please try again later.'); 
        });

});

function callApi (param1) {
    return new Promise((resolve, reject) => {
        // Create the path for the HTTP request to get the vehicle
        let path = '/api/' + encodeURIComponent(param1);
        console.log('API Request: ' + host + path);


        // Make the HTTP request to get the vehicle
        http.get({host: host, path: path}, (res) => {
            let body = ''; // var to store the response chunks
            res.on('data', (d) => { body += d; }); // store each response chunk
            res.on('end', () => {
                // After all the data has been received parse the JSON for desired data
                let response = JSON.parse(body);
                let output = {};

                //copy required response attributes to output here

                console.log(response.length.toString());
                resolve(output);
            });
            res.on('error', (error) => {
                console.log(`Error calling the API: ${error}`)
                reject();
            });
        }); //http.get
    });     //promise
}

exports.myFunction = functions.https.onRequest(app);

这几乎正常。 API被调用，我得到了数据。问题是如果没有async / await，该函数不会等待“callApi”完成，我从Google上的Actions中得到一个错误，即没有响应。出错后，我可以看到Firebase日志中的console.log输出，所以一切正常，它只是不同步。

我尝试使用async / await但遇到错误，我认为是因为Firebase使用的旧版本的node.js不支持异步。

我怎样才能解决这个问题？

Answer 1

您的函数callApi会返回一个承诺，但您不会在您的意图处理程序中返回承诺。您应该确保添加return，以便处理程序知道等待响应。

app.intent('my_intent_1', (conv, {param1}) => {
     // Call the rate API
    return callApi(param1).then((output) => {
        console.log(output);
        conv.close(`I found ${output.length} items!`); 
    }).catch(() => {
        conv.close('Error occurred while trying to get vehicles. Please try again later.'); 
    });
});

如何通过Firebase功能为Google上的操作调用第三方Rest API

1 个答案: