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