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lambda-go

Overview

A working example for developing Alexa Skills Kit for your Amazon Echo with AWS Lambda. This example wraps a Go executable/process in an Node.js wrapper. Yes, Go works just fine on AWS.

Requirements

  1. Golang v1.4+
  • Linux compilation must be installed, as AWS Lambda is Linux based (OSX: brew install go --cross-compile-common)
  1. go get github.com/jasonmoo/lambda_proc
  2. s3up
  3. awscli
  • On OSX: brew install awscli

Installation

  1. git clone https://github.com/jsgoecke/lambda-go.git
  • Change the LAMBDA_PROC variable in the file 'build.sh' to the name of your Lambda function on AWS Lambda
  1. Setup an AWS Lambda function with the name set for LAMBDA_PROC in build.sh
  2. Setup an AWS S3 Bucket with the same name set for LAMBDA_PROC in build.sh
  3. Setup an Alex Skill with the 'Alexa Skills Settings' and pointing to your AWS Lambda function, its recommended to use ARN

An overview of using AWS Lambda with Alexa may be found here:

https://developer.amazon.com/public/solutions/alexa/alexa-skills-kit/docs/developing-an-alexa-skill-as-a-lambda-function

Deploy

After configuring your s3up and awscli credentials for S3/Lambda, then:

./build.sh

Result

+ LAMBDA_FUNC=lambda-go
+ cp index.js.template index.js
+ sed s/LAMBDA_FUNC/lambda-go/g
+ GOOS=linux
+ go build -o lambda-go
+ zip -r lambda-go.zip lambda-go index.js
updating: lambda-go (deflated 70%)
updating: index.js (deflated 63%)
+ s3up lambda-go.zip lambda-go
+ aws lambda update-function-code --function-name lambda-go --s3-bucket lambda-go --s3-key lambda-go.zip
{
    "CodeSha256": "foo", 
    "FunctionName": "lambda-go", 
    "CodeSize": 905999, 
    "MemorySize": 128, 
    "FunctionArn": "bar", 
    "Version": "$LATEST", 
    "Role": "baz", 
    "Timeout": 3, 
    "LastModified": "2015-11-08T15:06:44.854+0000", 
    "Handler": "index.handler", 
    "Runtime": "nodejs", 
    "Description": "Lambda Go Example"
}

Alexa Skill Settings

Intent Schema

{
  "intents": [
    {
      "intent": "Command",
      "slots": [
        {
          "name": "Action",
          "type": "ACTION"
        },
        {
          "name": "Name",
          "type": "NAMES"
        }
      ]
    }
  ]
}

Custom Slot Types

ACTION 	walk | talk | bike | run 	
NAMES 	fred | thelma | shaggy

Sample Utterance

Command {Name} go {Action}

Test

Question

shaggy go run

Request from Alexa

{
  "session": {
    "sessionId": "SessionId.cb4e8a06-58ff-4d6a-befd-1e7a16be0a32",
    "application": {
      "applicationId": "foo"
    },
    "attributes": null,
    "user": {
      "userId": "amzn1.account.bar",
      "accessToken": null
    },
    "new": true
  },
  "request": {
    "type": "IntentRequest",
    "requestId": "EdwRequestId.58a4d6d4-f656-4e7e-8ea0-81ad6e66aa82",
    "timestamp": 1446994642447,
    "intent": {
      "name": "Command",
      "slots": {
        "Action": {
          "name": "Action",
          "value": "run"
        },
        "Name": {
          "name": "Name",
          "value": "shaggy"
        }
      }
    },
    "reason": null
  }
}

Response to Alexa

{
  "version": "1.0",
  "response": {
    "outputSpeech": {
      "type": "PlainText",
      "text": "You told shaggy to run"
    },
    "reprompt": null,
    "shouldEndSession": true
  },
  "sessionAttributes": {}
}