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AWS LambdaA quick introduction

Chris Richardson

Author of POJOs in ActionFounder of the original CloudFoundry.com

@crichardsonchris@chrisrichardson.nethttp://plainoldobjects.comhttp://microservices.io

@crichardson

“The Magic Happens at the Intersection of

Functions, Events and Data”

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AWS Lambda is a PaaS*for

event-driven microservices

* in a restricted kind of way

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NodeJS functions that consume events

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

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NodeJS module

Specify event handler

Resource limits

IAM role for lambda execution

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NodeJS-powered home security

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NodeJS-powered home security

Upload2S3 UploadQueueProcessor

SQS Queue DynamoDBS3

Log file Upload dir.

IpCamViewerWeb App

FTP server Upload image

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NodeJS + Lambda

Upload2S3

DynamoDBS3

Log file Upload dir.

IpCamViewerWeb App

FTP server

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S3 notifications

Lambda to invoke

Invoking IAM role

Triggering events

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Promise-based event handling code

Asynchronouslyprocess event

Invoke success/error handler when all events have been processed

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s3ObjectProcessor.process() ultimately invokes AWS SDK

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Uploading the lambda

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IAM role policieslambda_exec_rolelambda_invoke_role

Permission to invoke lambda

Permission to access DynamoDB tables

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aws s3 cp IMG_2824.jpg "s3://imagecamimage-std/partitions/20130217/ipcam/

ipcam99/000DC5D76EFE(ipcam99)_1_20130217052637_1219.jpg" 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)

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Cloud Watch logs

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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

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@crichardson chris@chrisrichardson.net

http://plainoldobjects.com http://microservices.io