使用wcf.js和node.js与Alexa联系WCF服务不能正常工作？

Question

使用Alexa-sdk node.js lambda aws服务wcf.js xml2js和VB.NET Web服务。

这个想法是将两个字符串发送到Web服务，并获取一个字符串，以换取Alexa随后将说出的字符串。 一切工作到最后，Alexa应该说出返回的字符串。

这是经过修改的Hello World应用程序。 向WCF服务发送两个字符串。 但是proxy.send之后的console.log行似乎在代理行完成之前运行，并且stringpeech变量未定义，就好像代理行尚未完成运行一样。

码：

'use strict';
var Alexa = require("alexa-sdk");

// For detailed tutorial on how to making a Alexa skill,
// please visit us at http://alexa.design/build


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

var handlers = {
'LaunchRequest': function () {
    this.emit('SayHello');
},
'HelloWorldIntent': function () {
    this.emit('SayHello');
},
'MyNameIsIntent': function () {
    this.emit('SayHelloName');
},
'SayHello': function () {
    console.log("start");
    var stringspeech;
    var parseString = require('xml2js').parseString;
    var BasicHttpBinding = require('wcf.js').BasicHttpBinding
    , Proxy = require('wcf.js').Proxy
    , binding = new BasicHttpBinding()
    , proxy = new Proxy (binding, "http://service.menofnoblegirth.com/service1.svc")
    , message = "<Envelope xmlns='http://schemas.xmlsoap.org/soap/envelope/'>" +
             "<Header />" +
               "<Body>" +
                 "<GetData xmlns='http://tempuri.org/'>" +
                   "<value>test</value>" +
                   "<value2>test2</value2>" +
                 "</GetData>" +
                "</Body>" +
           "</Envelope>"
    proxy.send(message, "http://tempuri.org/IService1/GetData", function (response, ctx) {
        parseString(response, function(error, result) {
            console.log(JSON.stringify(result));
            var stringfun = JSON.stringify(result);
            var objectValue = JSON.parse(stringfun);
            console.log(objectValue["s:Envelope"]["s:Body"][0]["GetDataResponse"][0]["GetDataResult"][0]);
            stringspeech = objectValue["s:Envelope"]["s:Body"][0]["GetDataResponse"][0]["GetDataResult"][0];
            console.log("The variable stringspeech is now set to: " + stringspeech);

        });

    });
    console.log("The variable stringspeech is FINALLY set to: " + stringspeech);
    this.response.speak(stringspeech)
        .cardRenderer(stringspeech, stringspeech);
    this.emit(':responseReady');
},
'SayHelloName': function () {
    var name = this.event.request.intent.slots.name.value;
    this.response.speak('Hello ' + name)
        .cardRenderer('hello world', 'hello ' + name);
    this.emit(':responseReady');
},
'SessionEndedRequest' : function() {
    console.log('Session ended with reason: ' + this.event.request.reason);
},
'AMAZON.StopIntent' : function() {
    this.response.speak('Bye');
    this.emit(':responseReady');
},
'AMAZON.HelpIntent' : function() {
    this.response.speak("You can try: 'alexa, hello world' or 'alexa, ask hello world my" +
        " name is awesome Aaron'");
    this.emit(':responseReady');
},
'AMAZON.CancelIntent' : function() {
    this.response.speak('Bye');
    this.emit(':responseReady');
},
'Unhandled' : function() {
    this.response.speak("Sorry, I didn't get that. You can try: 'alexa, hello world'" +
        " or 'alexa, ask hello world my name is awesome Aaron'");
    }
};

LogFile结果：

START RequestId: 4345330e-1c06-11e8-90fc-970a92c343fd Version: $LATEST
2018-02-27T21:36:26.067Z 4345330e-1c06-11e8-90fc-970a92c343fd Warning: Application ID is not set
2018-02-27T21:36:26.106Z 4345330e-1c06-11e8-90fc-970a92c343fd start
2018-02-27T21:36:29.789Z 4345330e-1c06-11e8-90fc-970a92c343fd The variable stringspeech is FINALLY set to: undefined
2018-02-27T21:36:30.208Z 4345330e-1c06-11e8-90fc-970a92c343fd
{
"s:Envelope": {
    "$": {
        "xmlns:s": "http://schemas.xmlsoap.org/soap/envelope/"
    },
    "s:Body": [
        {
            "GetDataResponse": [
                {
                    "$": {
                        "xmlns": "http://tempuri.org/"
                    },
                    "GetDataResult": [
                        "You entered test test2"
                    ]
                }
            ]
        }
    ]
}
}

2018-02-27T21:36:30.226Z 4345330e-1c06-11e8-90fc-970a92c343fd You entered test test2
2018-02-27T21:36:30.226Z 4345330e-1c06-11e8-90fc-970a92c343fd The variable stringspeech is now set to: You entered test test2
END RequestId: 4345330e-1c06-11e8-90fc-970a92c343fd
REPORT RequestId: 4345330e-1c06-11e8-90fc-970a92c343fd Duration: 4349.27 ms Billed Duration: 4400 ms Memory Size: 128 MB Max Memory Used: 48 MB 

Answer 1

proxy.send调用正在异步运行。 要解决此问题，我必须更改proxy.send行，以便可以从proxy.send函数中访问this.response.speak。 现在看起来像这样：

proxy.send(message, "http://tempuri.org/IService1/GetData", (response, ctx) => {
    parseString(response, function(error, result) {
        console.log(JSON.stringify(result));
        var stringfun = JSON.stringify(result);
        var objectValue = JSON.parse(stringfun);
        console.log(objectValue["s:Envelope"]["s:Body"][0]["GetDataResponse"][0]["GetDataResult"][0]);
        stringspeech = objectValue["s:Envelope"]["s:Body"][0]["GetDataResponse"][0]["GetDataResult"][0];
        console.log("The variable stringspeech is now set to: " + stringspeech);
        console.log("The variable stringspeech is FINALLY set to: " + stringspeech);
        this.response.speak(stringspeech).cardRenderer(stringspeech, stringspeech);
        this.emit(':responseReady');

    });

});