From the AWS Chicago user group's September meetup on Serverless "Seeking Solutions for Debugging Node.js in Lambda" - Rob Ribeiro - DevOps Engineer @ Trek10 // @azurelogic

1. Seeking Solutions for Debugging
Node.js in Lambda
Rob Ribeiro
@azurelogic

2. About me

3. Serverlessconf Austin 2017

4. JSON.stringify vs util.inspect
Cycles and hidden members!
const util = require('util');
const serialize = obj => util.inspect(obj, {depth: null});
Module.exports.handler = (event, context, callback) => {
console.log(`Event: ${serialize(event)}`);
}

5. Screenshots: the lazy way
const imagePath = await chromeless
.goto('https://google.com/')
.screenshot()
const imageData = fs.readFileSync(imagePath);
console.log(
`image: ${new Buffer(imagedata).toString('base64')}`);

6. Local debugging
Not always the right solution
Serverless Offline
Lambda Local

7. We can do better. now.

8. AWS Lambda Debugger
GitHub
Run Node 6.10 in Lambda. Debug from your machine.
Proxy
- Activate with one line of code!
- Spin off your code in a debug mode child process and shim event, context,
callback
- Proxy WebSockets between child process and central broker
Broker: Switchboard for debuggers to connect to proxies

9. Demo o’clock

10. Thanks!
@azurelogic
https://www.trek10.com/
https://www.meetup.com/localvariables/