This document discusses AWS Lambda, a platform as a service for event-driven microservices. It provides an introduction and overview of AWS Lambda and how it can be used to process events from services like S3, Kinesis, and DynamoDB using Node.js functions. Examples are given of how AWS Lambda could be used to build a serverless home security system that processes images uploaded to S3.

1. @crichardson
AWS Lambda
A quick introduction
Chris Richardson
Author of POJOs in Action
Founder of the original CloudFoundry.com
@crichardson
chris@chrisrichardson.net
http://plainoldobjects.com
http://microservices.io

2. “The Magic Happens at the
@crichardson
Intersection of
Functions, Events and Data”

3. @crichardson
AWS Lambda is a PaaS*
for
event-driven microservices
* in a restricted kind of way

4. NodeJS functions that consume
events
@crichardson
S3
Kinesis
DynamoDB
console.log('Loading event');
exports.handler = function(event, context) {
console.log('value1 = ' + event.key1);
console.log('value2 = ' + event.key2);
console.log('value3 = ' + event.key3);
context.done(null, 'Hello World');
};
Events
Pricing (once you have exceeded the free tier)
$0.0000002 per request
$0.00001667 for every GB-second
Invoke API

5. IAM role for lambda
@crichardson
NodeJS module
Specify event handler
execution
Resource limits

6. @crichardson

7. NodeJS-powered home security
@crichardson

8. NodeJS-powered home security
FTP server Upload image
IpCamViewer
Web App
@crichardson
Log file Upload dir.
Upload2S3 UploadQueue
Processor
S3 SQS Queue DynamoDB

9. IpCamViewer
Web App
@crichardson
NodeJS + Lambda
FTP server
Log file Upload dir.
Upload2S3
S3 DynamoDB

10. Triggering
events
@crichardson
S3 notifications
Lambda to
invoke
Invoking IAM
role

11. Promise-based event handling
code
Asynchronously
process event
@crichardson
Invoke success/error handler when all
events have been processed

12. s3ObjectProcessor.process()
ultimately invokes AWS SDK
@crichardson

13. @crichardson
Uploading the lambda

14. @crichardson
IAM role policies
lambda_invoke_role lambda_exec_role
Permission to invoke lambda
Permission to access
DynamoDB tables

15. @crichardson
12
aws s3 cp IMG_2824.jpg
"s3://imagecamimage-std/partitions/20130217/ipcam/ipcam99/000DC5D76EFE(ipcam99)_1_20130217052637_1219.jpg"
DynamoDB table lambda-imagesbyipcamandtimestamp(ipcam, timestamp)
lambda-ipcambydayandtimebucket(ipcamandday)

16. @crichardson
Cloud Watch logs

17. @crichardson
Final thoughts
Useful for writing “simple” AWS-oriented services
What would be nice:
Ability to specific environment variables for externalized
configuration, e.g. names of AWS resources

18. @crichardson
@crichardson chris@chrisrichardson.net
http://plainoldobjects.com http://microservices.io