node.js - Alexa 的 AWS Lambda 函数中的 HTTP 请求失败

Question

我正在尝试从内联 Lambda 函数中的外部 API 返回数据，但当我在 Alexa 开发者控制台中测试此数据时，我收到“请求的技能响应存在问题”，但我无法找出原因。另外，当我从 AWS 控制台执行此操作时，我无法通过 console.log 查看它实际返回的内容。
(为了帖子的目的，我已经删除了默认 intent )

const request = require('request');

const handlers = {
'LaunchRequest': function () {
    this.emit(':ask', 'Welcome');
},
'GiveUpdateIntent': function (){
    var slot = this.event.request.intent.slots.line.value;

    httpGet(slot, (theResult) => {
            this.response.speak(theResult);
            this.emit(':responseReady');
        });

}

};
function httpGet(query, callback) {
var options = {
    host: 'api.tfl.gov.uk',
    path: '/line/' + encodeURIComponent(query) + '/status',
    method: 'GET',
};

var req = http.request(options, res => {
    res.setEncoding('utf8');
    var responseString = "";

    //accept incoming data asynchronously
    res.on('data', chunk => {
        responseString += chunk;
    });

    //return the data when streaming is complete
    res.on('end', () => {
        console.log(responseString[0]);
        callback(responseString[0]);
    });

});
req.end();
}


exports.handler = function (event, context, callback) {
    const alexa = Alexa.handler(event, context, callback);
    alexa.APP_ID = APP_ID;
    alexa.registerHandlers(handlers);
    alexa.execute();
};

Answer 1

“请求的技能响应存在问题”通常意味着您的技能响应未采用预期格式。

您的 API 请求

例如:维多利亚

https://api.tfl.gov.uk/Line/victoria/Status  

返回 JSON，您不能直接将其作为响应传递给 Alexa。在将其发送回 Alexa 之前，请取出您实际希望 Alexa 说话的状态。然后将其放入任何技能用户都能理解的有意义的句子中并将其发回。

例如，您可以返回如下内容:

var speech = "Status severity description for " + 
              this.event.request.intent.slots.line.value +
              " is "
              + responseBody[0].lineStatuses.statusSeverityDescription;
this.emit(':ask',speech, "your re-prompt here");

这是我得到的示例 JSON

[
  {
    "$type": "Tfl.Api.Presentation.Entities.Line, Tfl.Api.Presentation.Entities",
    "id": "victoria",
    "name": "Victoria",
    "modeName": "tube",
    "disruptions": [],
    "created": "2018-07-31T12:11:08.477Z",
    "modified": "2018-07-31T12:11:08.477Z",
    "lineStatuses": [
      {
        "$type": "Tfl.Api.Presentation.Entities.LineStatus, Tfl.Api.Presentation.Entities",
        "id": 0,
        "statusSeverity": 10,
        "statusSeverityDescription": "Good Service",
        "created": "0001-01-01T00:00:00",
        "validityPeriods": []
      }
    ],
    "routeSections": [],
    "serviceTypes": [
      {
        "$type": "Tfl.Api.Presentation.Entities.LineServiceTypeInfo, Tfl.Api.Presentation.Entities",
        "name": "Regular",
        "uri": "/Line/Route?ids=Victoria&serviceTypes=Regular"
      },
      {
        "$type": "Tfl.Api.Presentation.Entities.LineServiceTypeInfo, Tfl.Api.Presentation.Entities",
        "name": "Night",
        "uri": "/Line/Route?ids=Victoria&serviceTypes=Night"
      }
    ],
    "crowding": {
      "$type": "Tfl.Api.Presentation.Entities.Crowding, Tfl.Api.Presentation.Entities"
    }
  }
]

CloudWatch:请始终使用 CloudWatch 查看 Lambda 函数的日志，您将在 Lambda 函数的Monitoring 选项卡下看到一个链接。

配置 Lambda 测试事件:您可以直接从内嵌编辑器测试 Lambda 代码，方法是在您的 Test 菜单下配置 Lambda Test Events。内联编辑器。一个函数最多可以有 10 个测试事件。