Allen Helton
Created December 1, 2016

Beer Genius

Get all information you could want about any commercial beer!

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Beer Genius

Things used in this project

Hardware components

Amazon Echo
Amazon Alexa Amazon Echo
×1

Software apps and online services

Alexa Skills Kit
Amazon Alexa Alexa Skills Kit
AWS Lambda
Amazon Web Services AWS Lambda
BreweryDB
The public facing API I used to query the beer information

Story

Read more

Schematics

Web Schematic

This is the web schematic from the client (echo) to the web service
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Code

index.js

JavaScript
This is the logic behind the web service for the skill
/**
 * App ID for the skill
 */
var APP_ID = 'amzn1.ask.skill.44da0b47-2e22-42f2-b842-23265a62199d'; 

var http = require('http');

/**
 * The AlexaSkill Module that has the AlexaSkill prototype and helper functions
 */
var AlexaSkill = require('./AlexaSkill');

/**
 * URL prefix to download beer data from BreweryDB
 */
var urlPrefix = 'http://api.brewerydb.com/v2/search?type=beer&format=json&withBreweries=y&q=';

/**
 * API Key for Brewery DB
 */
var API_KEY = '6cad244c5d5724aeff270899cc1db35c';

var url = function(beerName){
    if(beerName === null || beerName == undefined){
        beerName = "";
    }
	beerName = beerName.replace(" ", "%20");
	return urlPrefix + beerName + '&key=' + API_KEY;
};

var getJsonFromWebService = function(beerName, callback) {
    http.get(url(beerName), function(res) {
        var body = '';

        res.on('data', function (data) {
            body += data;
        });

        res.on('end', function () {
            var result = JSON.parse(body);
            callback(result);
        });
    }).on('error', function (e) {
        console.log("Got error: ", e);
    });
};

var handleGetBeerRequest = function (intent, session, response) {
    //console.log("handleGetBeerRequest. Has beerName: " + intent.slots.beerName);
    if(intent.slots.beerName === null || intent.slots.beerName == undefined || intent.slots.beerName.value === "" || intent.slots.beerName.value == undefined){
        var speechOutput = "Hmm. I didn't catch that. What beer would you like to know about?";
        var repromptOutput = "What beer would you like to know about?";
        response.ask(speechOutput, repromptOutput);
        
        return;
    }
    getJsonFromWebService(intent.slots.beerName.value, function(data){
		var speechText = "";
		var cardHeader = "";
		var cardContent = "";
		var beerName = intent.slots.beerName.value;
		var breweryName = "";
        if (data.length === 0 || data.data === null || data.data == undefined) {
            speechText = "I could not find a beer with the name " + intent.slots.beerName.value + ".";
            cardContent = speechText;
        } else {
			var searchableBeerName = beerName.toUpperCase();
            var foundBeer, potentialBeer;
            for(var i = 0; i < data.data.length; i++) {
              var beer = data.data[i];
              
              if((beer.name != undefined && beer.name.toUpperCase() == searchableBeerName) || (beer.nameDisplay != undefined && beer.nameDisplay.toUpperCase() == searchableBeerName)
              || (beer.name != undefined && beer.name.toUpperCase().startsWith(searchableBeerName)) || (beer.nameDisplay != undefined && beer.nameDisplay.toUpperCase().startsWith(searchableBeerName))){
                potentialBeer = beer;
				if(intent.slots.breweryName !== null && intent.slots.breweryName.value !== "" && intent.slots.breweryName != undefined  && intent.slots.breweryName.value != undefined){
				  breweryName = intent.slots.breweryName.value.toUpperCase();
                  var searchBreweryName = breweryName;
				  for(var bi = 0; bi < beer.breweries.length; bi++){
                    var brewery = beer.breweries[bi];
                    var name = brewery.name.toUpperCase();
                    var shortName = brewery.nameShortDisplay.toUpperCase();
                    if(name == searchBreweryName || shortName == searchBreweryName || name.startsWith(searchBreweryName) || shortName.startsWith(searchBreweryName) ){
                      foundBeer = beer;
                      break;
                    }
                  }
				}
				if(foundBeer != undefined){
                      break;
                }
              }
            }

            if(potentialBeer != undefined && foundBeer == undefined){
              foundBeer = potentialBeer;
            } else  if (potentialBeer == undefined && foundBeer == undefined){
              foundBeer = data.data[0];
            }
             
			if(foundBeer !== null){
			  speechText = foundBeer.nameDisplay + " is a " + foundBeer.abv + "% " + foundBeer.style.shortName + " from " + foundBeer.breweries[0].name 
			    + " in " + foundBeer.breweries[0].locations[0].locality + " " + foundBeer.breweries[0].locations[0].region;
				
				if(foundBeer.description != null && foundBeer.description != undefined){
				    speechText = speechText + " described by the brewer as, " + foundBeer.description + ".";
				}
				
			  cardContent = speechText;
			  cardHeader = beerName;
			  if(breweryName !== ""){
			  	cardHeader = cardHeader + " by " + breweryName;
			  }
			} else{
			  speechText = "I was unable to find a beer with the name " + beerName + ". Try asking about a different beer.";
			  cardHeader = "Could not find beer";
			}		
        }
		response.tellWithCard(speechText, cardHeader, cardContent);
	});	
};

var BeerGeniusSkill = function() {
    AlexaSkill.call(this, APP_ID);
};

BeerGeniusSkill.prototype = Object.create(AlexaSkill.prototype);
BeerGeniusSkill.prototype.constructor = BeerGeniusSkill;

BeerGeniusSkill.prototype.eventHandlers.onSessionStarted = function (sessionStartedRequest, session) {
    console.log("BeerGeniusSkill onSessionStarted requestId: " + sessionStartedRequest.requestId
        + ", sessionId: " + session.sessionId);

    // This skill is all one-shot, so no session initialization logic needed.
};

BeerGeniusSkill.prototype.eventHandlers.onLaunch = function (launchRequest, session, response) {
    var output = "With Beer Genius, you can get the details for any beer. For example, you could say describe Sculpin by Ballast Point, or tell me about Prairie Bomb.";
    var reprompt = "What beer do you want to know about?";
	
	response.ask(output, reprompt);
	console.log("BeerGeniusSkill onLaunch requestId: " + launchRequest.requestId + ", sessionId: " + session.sessionId);
};

BeerGeniusSkill.prototype.eventHandlers.onSessionEnded = function (sessionEndedRequest, session) {
    console.log("onSessionEnded requestId: " + sessionEndedRequest.requestId
        + ", sessionId: " + session.sessionId);

    // This skill is all one-shot, so no session cleanup logic needed.
};

BeerGeniusSkill.prototype.intentHandlers = {

    GetBeer: function (intent, session, response) {
        handleGetBeerRequest(intent, session, response);
    },    

    "AMAZON.HelpIntent": function (intent, session, response) {
        var speechText = "With Beer Genius, you can get the details for any beer.  " +
            "For example, you could say describe Sculpin by Ballast Point, or tell me about Prairie Bomb";
        var repromptText = "Which beer do you want to know about?";
        
        response.ask(speechText, repromptText);
    },
    
    "AMAZON.StopIntent": function (intent, session, response) {
        var speechText = "Goodbye.";
        response.tell(speechText);
    },

    "AMAZON.CancelIntent": function (intent, session, response) {
       var speechText = "Goodbye.";
        response.tell(speechText);
    }
};


// Create the handler that responds to the Alexa Request.
exports.handler = function (event, context) {    
    var skill = new BeerGeniusSkill();
    skill.execute(event, context);
};

Credits

Allen Helton

Allen Helton

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