我们正在研究Alexa技能，它需要联系外部REST API以获取数据。由于某种原因，我很难在lambda函数中使用它。我也很难确定问题是否在我的node.js代码中没有正确使用回调，或者它是否在我的函数的VPC设置中。这是我的代码，我已经删除了非必要的东西。
/* eslint-disable func-names */
/* eslint quote-props: ["error", "consistent"]*/
/**
* This sample demonstrates a simple skill built with the Amazon Alexa Skills
* nodejs skill development kit.
* This sample supports multiple lauguages. (en-US, en-GB, de-DE).
* The Intent Schema, Custom Slots and Sample Utterances for this skill, as well
* as testing instructions are located at https://github.com/alexa/skill-sample-nodejs-fact
**/
'use strict';
const Alexa = require('alexa-sdk');
const APP_ID = undefined; // TODO replace with your app ID (OPTIONAL).
const https = require('https');
const handlers = {
'LaunchRequest': function () {
this.emit('GetFact');
},
'GetNewFactIntent': function () {
this.emit('GetFact');
},
'maintenanceIntent': function () {
console.log('inside maintenanceIntent');
var options = {
host: 'api.forismatic.com',
path: '/api/1.0/?method=getQuote&lang=en&format=text',
method: 'GET'
};
getQuote(options, function (quote){
if(quote === ''){
console.log("No quote");
//speechOutput = "Please try again later";
}
else{console.log(quote)}
//self.emit(':tellWithCard', speechOutput, SKILL_NAME, text);
});
// Create speech output
// Place holder
var randomFact = 'Test Fact';
const speechOutput = randomFact;
this.emit(':tellWithCard', speechOutput, 'test skill name', randomFact);
},
'AMAZON.HelpIntent': function () {
const speechOutput = this.t('HELP_MESSAGE');
const reprompt = this.t('HELP_MESSAGE');
this.emit(':ask', speechOutput, reprompt);
},
'AMAZON.CancelIntent': function () {
this.emit(':tell', this.t('STOP_MESSAGE'));
},
'AMAZON.StopIntent': function () {
this.emit(':tell', this.t('STOP_MESSAGE'));
},
};
exports.handler = function (event, context, callback) {
const alexa = Alexa.handler(event, context);
alexa.APP_ID = APP_ID;
// To enable string internationalization (i18n) features, set a resources object.
//alexa.resources = languageStrings;
alexa.registerHandlers(handlers);
alexa.execute();
};
function getQuote(options, callback){
var text = '';
console.log("in getquote");
https.get(options, function(res) {
console.error("Got response: " + res.statusCode);
res.on("data", function(chunk) {
console.error("BODY: " + chunk);
text = '' + chunk;
return callback(text);
});
}).on('error', function(e) {
text = 'error' + e.message;
console.error("Got error: " + e.message);
});
}
现在，当我调用maintenanceIntent时，这就是我在日志中看到的内容。
{"timestamp":1508426249817,"message":"START RequestId: 9f66123e-b4e0-11e7-baac-1bfb01d2abc8 Version: $LATEST","logStream":"2017/10/19/[$LATEST]0e048ab2fc5441cda8007e4a1963bf02","logGroup":"/aws/lambda/factDemo","requestID":"9f66123e-b4e0-11e7-baac-1bfb01d2abc8"}
{"timestamp":1508426250256,"message":"Warning: Application ID is not set","logStream":"2017/10/19/[$LATEST]0e048ab2fc5441cda8007e4a1963bf02","logGroup":"/aws/lambda/factDemo","requestID":"9f66123e-b4e0-11e7-baac-1bfb01d2abc8"}
{"timestamp":1508426250256,"message":"inside maintenanceIntent","logStream":"2017/10/19/[$LATEST]0e048ab2fc5441cda8007e4a1963bf02","logGroup":"/aws/lambda/factDemo","requestID":"9f66123e-b4e0-11e7-baac-1bfb01d2abc8"}
{"timestamp":1508426250256,"message":"in getquote","logStream":"2017/10/19/[$LATEST]0e048ab2fc5441cda8007e4a1963bf02","logGroup":"/aws/lambda/factDemo","requestID":"9f66123e-b4e0-11e7-baac-1bfb01d2abc8"}
{"timestamp":1508426250256,"message":"END RequestId: 9f66123e-b4e0-11e7-baac-1bfb01d2abc8","logStream":"2017/10/19/[$LATEST]0e048ab2fc5441cda8007e4a1963bf02","logGroup":"/aws/lambda/factDemo","requestID":"9f66123e-b4e0-11e7-baac-1bfb01d2abc8"}
{"timestamp":1508426250256,"message":"REPORT RequestId: 9f66123e-b4e0-11e7-baac-1bfb01d2abc8\tDuration: 378.28 ms\tBilled Duration: 400 ms \tMemory Size: 128 MB\tMax Memory Used: 33 MB\t","logStream":"2017/10/19/[$LATEST]0e048ab2fc5441cda8007e4a1963bf02","logGroup":"/aws/lambda/factDemo","requestID":"9f66123e-b4e0-11e7-baac-1bfb01d2abc8"}
所以我可以看到它实际上调用了getQuote函数。我根本没有看到任何错误或成功消息。我想也许我没有正确使用回调（节点不是我的常规开发语言）但是我实际上是直接从GitHub上的亚马逊示例中提取代码而我甚至无法获得上班。 （这段代码与它非常相似，只是它更短一些。）
如果我将其剥离并通过节点在本地运行它，它可以正常工作。
就网络内容而言，我遵循了本指南：https://gist.github.com/reggi/dc5f2620b7b4f515e68e46255ac042a7 。我也尝试过亚马逊指南，但此时我甚至不确定如何检查互联网连接或者这是否是问题。
非常感谢任何帮助您走上正确的道路！
- 编辑 -
我已经改变了我的代码。这直接来自https://raw.githubusercontent.com/alexa/alexa-cookbook/master/external-calls/httpsGet/src/index.js
的alexa-cookbook/* eslint-disable func-names */
/* eslint quote-props: ["error", "consistent"]*/
/**
* This sample demonstrates a simple skill built with the Amazon Alexa Skills
* nodejs skill development kit.
* This sample supports multiple lauguages. (en-US, en-GB, de-DE).
* The Intent Schema, Custom Slots and Sample Utterances for this skill, as well
* as testing instructions are located at https://github.com/alexa/skill-sample-nodejs-fact
**/
'use strict';
const Alexa = require('alexa-sdk');
const APP_ID = undefined; // TODO replace with your app ID (OPTIONAL).
const https = require('https');
const handlers = {
'LaunchRequest': function () {
this.emit('GetFact');
},
'GetNewFactIntent': function () {
this.emit('GetFact');
},
'maintenanceIntent': function () {
console.log('inside maintenanceIntent');
var myRequest = 'Florida';
httpsGet(myRequest, (myResult) => {
console.log("sent : " + myRequest);
console.log("received : " + myResult);
this.response.speak('The population of ' + myRequest + ' is ' + myResult);
this.emit(':responseReady');
}
);
// Create speech output
// Place holder
var randomFact = 'Test Fact';
const speechOutput = randomFact;
this.emit(':tellWithCard', speechOutput, 'test skill name', randomFact);
},
'AMAZON.HelpIntent': function () {
const speechOutput = this.t('HELP_MESSAGE');
const reprompt = this.t('HELP_MESSAGE');
this.emit(':ask', speechOutput, reprompt);
},
'AMAZON.CancelIntent': function () {
this.emit(':tell', this.t('STOP_MESSAGE'));
},
'AMAZON.StopIntent': function () {
this.emit(':tell', this.t('STOP_MESSAGE'));
},
};
exports.handler = function (event, context, callback) {
console.log("exports handler");
const alexa = Alexa.handler(event, context);
alexa.APP_ID = APP_ID;
// To enable string internationalization (i18n) features, set a resources object.
//alexa.resources = languageStrings;
alexa.registerHandlers(handlers);
alexa.execute();
console.log("post execute");
};
function httpsGet(myData, callback) {
// GET is a web service request that is fully defined by a URL string
// Try GET in your browser:
// https://cp6gckjt97.execute-api.us-east-1.amazonaws.com/prod/stateresource?usstate=New%20Jersey
console.log("in");
console.log(myData);
// Update these options with the details of the web service you would like to call
var options = {
host: 'cp6gckjt97.execute-api.us-east-1.amazonaws.com',
port: 443,
path: '/prod/stateresource?usstate=' + encodeURIComponent(myData),
method: 'GET',
// if x509 certs are required:
// key: fs.readFileSync('certs/my-key.pem'),
// cert: fs.readFileSync('certs/my-cert.pem')
};
var req = https.request(options, res => {
res.setEncoding('utf8');
var returnData = "";
console.log("request");
res.on('data', chunk => {
console.log("data");
returnData = returnData + chunk;
});
res.on('end', () => {
console.log("end");
// we have now received the raw return data in the returnData variable.
// We can see it in the log output via:
// console.log(JSON.stringify(returnData))
// we may need to parse through it to extract the needed data
var pop = JSON.parse(returnData).population;
callback(pop); // this will execute whatever function the caller defined, with one argument
});
});
console.log("req.end");
req.end();
}
相同的想法，但从端点获取结果的执行略有不同。这是日志输出。
{"timestamp":1508434982754,"message":"START RequestId: f4a39351-b4f4-11e7-a563-fbf7599fa72f Version: $LATEST","logStream":"2017/10/19/[$LATEST]3252e394be9b4a229c3a0d042deffbf8","logGroup":"/aws/lambda/factDemo","requestID":"f4a39351-b4f4-11e7-a563-fbf7599fa72f"}
{"timestamp":1508434982887,"message":"exports handler","logStream":"2017/10/19/[$LATEST]3252e394be9b4a229c3a0d042deffbf8","logGroup":"/aws/lambda/factDemo","requestID":"f4a39351-b4f4-11e7-a563-fbf7599fa72f"}
{"timestamp":1508434982887,"message":"Warning: Application ID is not set","logStream":"2017/10/19/[$LATEST]3252e394be9b4a229c3a0d042deffbf8","logGroup":"/aws/lambda/factDemo","requestID":"f4a39351-b4f4-11e7-a563-fbf7599fa72f"}
{"timestamp":1508434982887,"message":"inside maintenanceIntent","logStream":"2017/10/19/[$LATEST]3252e394be9b4a229c3a0d042deffbf8","logGroup":"/aws/lambda/factDemo","requestID":"f4a39351-b4f4-11e7-a563-fbf7599fa72f"}
{"timestamp":1508434982887,"message":"in","logStream":"2017/10/19/[$LATEST]3252e394be9b4a229c3a0d042deffbf8","logGroup":"/aws/lambda/factDemo","requestID":"f4a39351-b4f4-11e7-a563-fbf7599fa72f"}
{"timestamp":1508434982887,"message":"Florida","logStream":"2017/10/19/[$LATEST]3252e394be9b4a229c3a0d042deffbf8","logGroup":"/aws/lambda/factDemo","requestID":"f4a39351-b4f4-11e7-a563-fbf7599fa72f"}
{"timestamp":1508434983307,"message":"req.end","logStream":"2017/10/19/[$LATEST]3252e394be9b4a229c3a0d042deffbf8","logGroup":"/aws/lambda/factDemo","requestID":"f4a39351-b4f4-11e7-a563-fbf7599fa72f"}
{"timestamp":1508434983309,"message":"post execute","logStream":"2017/10/19/[$LATEST]3252e394be9b4a229c3a0d042deffbf8","logGroup":"/aws/lambda/factDemo","requestID":"f4a39351-b4f4-11e7-a563-fbf7599fa72f"}
{"timestamp":1508434983367,"message":"END RequestId: f4a39351-b4f4-11e7-a563-fbf7599fa72f","logStream":"2017/10/19/[$LATEST]3252e394be9b4a229c3a0d042deffbf8","logGroup":"/aws/lambda/factDemo","requestID":"f4a39351-b4f4-11e7-a563-fbf7599fa72f"}
{"timestamp":1508434983367,"message":"REPORT RequestId: f4a39351-b4f4-11e7-a563-fbf7599fa72f\tDuration: 608.20 ms\tBilled Duration: 700 ms \tMemory Size: 128 MB\tMax Memory Used: 35 MB\t","logStream":"2017/10/19/[$LATEST]3252e394be9b4a229c3a0d042deffbf8","logGroup":"/aws/lambda/factDemo","requestID":"f4a39351-b4f4-11e7-a563-fbf7599fa72f"}
我已经在VPC和VPC中尝试了相同的结果。
答案 0 :(得分：1)
由于这个问题，我们解决了这个问题：Node JS callbacks with Alexa skill
特别是，这一行
：tell函数将调用lambda回调并终止lambda函数的执行。
将httpsGet之外的this.emit移动到其中就像修复了问题一样。
httpsGet(myRequest, (myResult) => {
console.log("sent : " + myRequest);
console.log("received : " + myResult);
this.response.speak('The population of ' + myRequest + ' is ' + myResult);
this.emit(':responseReady');
// Create speech output
// Place holder
var randomFact = 'Test Fact';
const speechOutput = randomFact;
this.emit(':tellWithCard', speechOutput, 'test skill name', randomFact);
}
);