我在aws中使用firebase并希望变量＆＃39; contact＆＃39;在一个其他函数中使用的exports处理程序中，为了让它成为全局函数，它遵循异步调用，这就是为什么无法将它作为全局变量返回的想法，这是我的代码：
'use strict';
var firebase = require('firebase');
/**
* This sample demonstrates a simple skill built with the Amazon Alexa Skills Kit.
* The Intent Schema, Custom Slots, and Sample Utterances for this skill, as well as
* testing instructions are located at http://amzn.to/1LzFrj6
*
* For additional samples, visit the Alexa Skills Kit Getting Started guide at
* http://amzn.to/1LGWsLG
*/
// --------------- Helpers that build all of the responses -----------------------
function buildSpeechletResponse(title, output, repromptText, shouldEndSession) {
return {
outputSpeech: {
type: 'PlainText',
text: output,
},
card: {
type: 'Simple',
title: `SessionSpeechlet - ${title}`,
content: `SessionSpeechlet - ${output}`,
},
reprompt: {
outputSpeech: {
type: 'PlainText',
text: repromptText,
},
},
shouldEndSession,
};
}
function buildResponse(sessionAttributes, speechletResponse) {
return {
version: '1.0',
sessionAttributes,
response: speechletResponse,
};
}
// --------------- Functions that control the skill's behavior -----------------------
function getWelcomeResponse(callback) {
// If we wanted to initialize the session to have some attributes we could add those here.
const sessionAttributes = {};
const cardTitle = 'Welcome';
const speechOutput = 'Welcome to the Alexa Skills Kit sample. ' +
'Please ask me amy contact by saying, amy contact is 7389220636';
// If the user either does not reply to the welcome message or says something that is not
// understood, they will be prompted again with this text.
const repromptText = 'Please ask me amy contact by saying, ' +
'amy contact is 7389220636';
const shouldEndSession = false;
callback(sessionAttributes,
buildSpeechletResponse(cardTitle, speechOutput, repromptText, shouldEndSession));
}
function handleSessionEndRequest(callback) {
const cardTitle = 'Session Ended';
const speechOutput = 'Thank you for trying the Alexa Skills Kit sample. Have a nice day!';
// Setting this to true ends the session and exits the skill.
const shouldEndSession = true;
callback({}, buildSpeechletResponse(cardTitle, speechOutput, null, shouldEndSession));
}
function createContactAttributes(contactInfo) {
return {
contactInfo,
};
}
/**
* Sets the contact in the session and prepares the speech to reply to the user.
*/
function setContactInSession(intent, session, callback) {
const cardTitle = intent.name;
const contactInfoSlot = intent.slots.Contact;
let repromptText = '';
let sessionAttributes = {};
const shouldEndSession = false;
let speechOutput = '';
if (contactInfoSlot) {
const contactInfo = contactInfoSlot.value;
sessionAttributes = createContactAttributes(contactInfo);
speechOutput = `I now know amy contact is ${contactInfo}. You can ask me ` +
"amy contact by saying, what's amy contact?";
repromptText = "You can ask me amy by saying, what's amy contact?";
} else {
speechOutput = "I'm not sure what's amy contact. Please try again.";
repromptText = "I'm not sure what's amy contact.";
}
callback(sessionAttributes,
buildSpeechletResponse(cardTitle, speechOutput, repromptText, shouldEndSession));
}
function getContactFromSession(intent, session, callback) {
let contactInfo;
const repromptText = null;
const sessionAttributes = {};
let shouldEndSession = false;
let speechOutput = '';
if (session.attributes) {
contactInfo = session.attributes.contactInfo;
}
if (contactInfo) {
speechOutput = `Amy's contact is ${contactInfo}. Goodbye.`;
shouldEndSession = true;
} else {
speechOutput = "I'm not sure what's amy contact is, you can say, amy contact " +
' is 7389220636';
}
// Setting repromptText to null signifies that we do not want to reprompt the user.
// If the user does not respond or says something that is not understood, the session
// will end.
callback(sessionAttributes,
buildSpeechletResponse(intent.name, speechOutput, repromptText, shouldEndSession));
}
// --------------- Events -----------------------
/**
* Called when the session starts.
*/
function onSessionStarted(sessionStartedRequest, session) {
console.log(`onSessionStarted requestId=${sessionStartedRequest.requestId}, sessionId=${session.sessionId}`);
}
/**
* Called when the user launches the skill without specifying what they want.
*/
function onLaunch(launchRequest, session, callback) {
console.log(`onLaunch requestId=${launchRequest.requestId}, sessionId=${session.sessionId}`);
// Dispatch to your skill's launch.
getWelcomeResponse(callback);
}
/**
* Called when the user specifies an intent for this skill.
*/
function onIntent(intentRequest, session, callback) {
console.log(`onIntent requestId=${intentRequest.requestId}, sessionId=${session.sessionId}`);
const intent = intentRequest.intent;
const intentName = intentRequest.intent.name;
// Dispatch to your skill's intent handlers
if (intentName === 'MyContactIsIntent') {
setContactInSession(intent, session, callback);
} else if (intentName === 'WhatsMyContactIntent') {
getContactFromSession(intent, session, callback);
} else if (intentName === 'AMAZON.HelpIntent') {
getWelcomeResponse(callback);
} else if (intentName === 'AMAZON.StopIntent' || intentName === 'AMAZON.CancelIntent') {
handleSessionEndRequest(callback);
} else {
throw new Error('Invalid intent');
}
}
/**
* Called when the user ends the session.
* Is not called when the skill returns shouldEndSession=true.
*/
function onSessionEnded(sessionEndedRequest, session) {
console.log(`onSessionEnded requestId=${sessionEndedRequest.requestId}, sessionId=${session.sessionId}`);
// Add cleanup logic here
}
// --------------- Main handler -----------------------
// Route the incoming request based on type (LaunchRequest, IntentRequest,
// etc.) The JSON body of the request is provided in the event parameter.
exports.handler = function(event, context, callback) {
try {
console.log(`event.session.application.applicationId=${event.session.application.applicationId}`);
/**
* Uncomment this if statement and populate with your skill's application ID to
* prevent someone else from configuring a skill that sends requests to this function.
*/
/*
if (event.session.application.applicationId !== 'amzn1.echo-sdk-ams.app.[unique-value-here]') {
callback('Invalid Application ID');
}
*/
if (event.session.new) {
onSessionStarted({
requestId: event.request.requestId
}, event.session);
}
if (event.request.type === 'LaunchRequest') {
onLaunch(event.request,
event.session,
(sessionAttributes, speechletResponse) => {
callback(null, buildResponse(sessionAttributes, speechletResponse));
});
} else if (event.request.type === 'IntentRequest') {
onIntent(event.request,
event.session,
(sessionAttributes, speechletResponse) => {
callback(null, buildResponse(sessionAttributes, speechletResponse));
});
} else if (event.request.type === 'SessionEndedRequest') {
onSessionEnded(event.request, event.session);
callback();
}
if (firebase.apps.length == 0) {
firebase.initializeApp({
serviceAccount: "",
databaseURL: ""
});
}
var ref = firebase.database().ref();
var usersRef = ref.child('users');
usersRef.once('value').then(function(snap) {
//console.log(snap.child("messages").key, "\n\n");
//console.log(snap.ref.toString(), "\n\n");
snap.forEach(function(childSnapshot) {
var childKey = childSnapshot.val();
var contact = childKey.Contact;
console.log('Firebase data: ', contact);
firebase.database().goOffline();
callback(contact);
});
});
} catch (err) {
callback(err);
}
};