By Alexandre Pinhel (twitter.com/AlexPinhel), Solution Architect @AWS Serverless computing, where cloud providers dynamically allocate resources to execute the code, helps save money. Alexandre from Amazon Web Services came to The Family to present what’s new in the serverless space and also to build a serverless application (a Twitter bot leveraging Lambda layers to process tweets) on the spot! What new features have been released lately? What patterns are usable for serverless applications? What are the best practices and a concrete use case or two?

1. © 2019, Amazon Web Services, Inc. or its affiliates. All rights reserved.S U M M I T
AWS -Serverless
Alexandre Pinhel
AWS – Solutions Architect

2. © 2019, Amazon Web Services, Inc. or its affiliates. All rights reserved.S U M M I T
Serverlessapplications
Services (anything)
Changes in
data state
Requests to
endpoints
Changes in
resource state
Event source Function
Node.js
Python
Java
C#
Go
Ruby
Runtime API

3. © 2019, Amazon Web Services, Inc. or its affiliates. All rights reserved.S U M M I T
ServerlessWebApplications

4. © 2019, Amazon Web Services, Inc. or its affiliates. All rights reserved.S U M M I T
AWS Lambda releasehistory
?
*As of October 2018, does not include region launches
2015 2016 2017 2018

5. © 2019, Amazon Web Services, Inc. or its affiliates. All rights reserved.S U M M I T
Lambda Layers
Lets functions easily share code: Upload layer
once, reference within any function
Promote separation of responsibilities, lets
developers iterate faster on writing business logic
Built in support for secure sharing by ecosystem

6. © 2019, Amazon Web Services, Inc. or its affiliates. All rights reserved.S U M M I T
Using Lambda Layers
• Put common components in a ZIP file and
upload it as a Lambda Layer
• Layers are immutable and can be versioned
to manage updates
• When a version is deleted or permissions to
use it are revoked, functions that used it
previously will continue to work, but you won’t
be able to create new ones
• You can reference up to five layers, one of
which can optionally be a custom runtime
Lambda
Layers
arn:aws:lambda:region:accountId:layer:shared-lib
Lambda
Layers
arn:aws:lambda:region:accountId:layer:shared-lib:2
Lambda
Layers
arn:aws:lambda:region:accountId:layer:shared-lib:3

7. © 2019, Amazon Web Services, Inc. or its affiliates. All rights reserved.S U M M I T
Lambda RuntimeAPI
Bring any Linux compatible language runtime
Powered by new Runtime API - Codifies the
runtime calling conventions and integration points
At launch, custom runtimes powering Ruby support
in AWS Lambda, more runtimes from partners (like
Erlang)
Custom runtimes distributed as “layers”
Rule
Stack

8. © 2019, Amazon Web Services, Inc. or its affiliates. All rights reserved.S U M M I T
RuntimeBootstrap
• The bootstrap executable act as a bridge
between the Runtime HTTP API and the
Function to be executed
• Bootstrap needs to manage response/error
handling, context creation and function execution
• Information on the interface endpoint and the
function handler are shared as environment
variables
/runtime API
/invocation/next
/init/error /ID/error
/invocation/ID/response
/invocation/ID/error
bootstrap
Process events/headers
Clean up
Initialize and Invoke function
Response/Error handling
Lambda
Function

9. © 2019, Amazon Web Services, Inc. or its affiliates. All rights reserved.S U M M I T
Bootstrap d’un RuntimeCustom
• L’exécutable bootstrap agit comme un pont entre
le Runtime HTTP de Lambda et la fonction à
exécuter
• Le Boostrap doit gérer la gestion des réponses
et des erreurs, créer le contexte et executer la
fonction
• Les informations liées au endpoint et les handler
de fonction sont partagées comme des variables
environnement
/runtime API
/invocation/next
/init/error /ID/error
/invocation/ID/response
/invocation/ID/error
bootstrap
Process events/headers
Clean up
Initialize and Invoke function
Response/Error handling
Lambda
Function
#!/bin/sh
set -euo pipefail
# Initialization - load function handler
source $LAMBDA_TASK_ROOT/"$(echo $_HANDLER | cut -d. -f1).sh"
# Processing
while true
do
HEADERS="$(mktemp)"
# Get an event
EVENT_DATA=$(curl -sS -LD "$HEADERS" -X GET "http://${AWS_LAMBDA_RUNTIME_API}/2018-06-
01/runtime/invocation/next")
REQUEST_ID=$(grep -Fi Lambda-Runtime-Aws-Request-Id "$HEADERS" | tr -d '[:space:]' | cut -d: -f2)
# Execute the handler function from the script
RESPONSE=$($(echo "$_HANDLER" | cut -d. -f2) "$EVENT_DATA")
# Send the response
curl -X POST "http://${AWS_LAMBDA_RUNTIME_API}/2018-06-01/runtime/invocation/$REQUEST_ID/response" -d
"$RESPONSE"
done

10. © 2019, Amazon Web Services, Inc. or its affiliates. All rights reserved.S U M M I T
Common Lambda usecases
Web
Applications
• Static websites
• Complex web
apps
• Packages for
Flask and
Express
Data
Processing
• Real time
• MapReduce
• Batch
Chatbots
• Powering
chatbot logic
Backends
• Apps &
services
• Mobile
• IoT
</></>
Amazon
Alexa
• Powering
voice-enabled
apps
• Alexa Skills Kit
IT
Automation
• Policy engines
• Extending
AWS services
• Infrastructure
management

11. © 2019, Amazon Web Services, Inc. or its affiliates. All rights reserved.S U M M I T
Serverlessarchitectures
1. File put into bucket
2. Lambda invoked 2. Lambda invoked
1. Data published to a
topic
Data
1. Message inserted
into to a queue
3. Function
removes
message from
queue
2. Lambda polls
queue and invokes
function
Topic
MessageObject

12. © 2019, Amazon Web Services, Inc. or its affiliates. All rights reserved.S U M M I T
Serverlessarchitectures
2. Lambda polls
stream
1. Data published to a
stream
3. Amazon Kinesis
returns stream
data
Data
2. Lambda invoked
1. Chatbot conversation
needs “fulfillment”
Chatbot
1. Scheduled time
occurs
2. Lambda invoked
Event (time-based)

13. © 2019, Amazon Web Services, Inc. or its affiliates. All rights reserved.S U M M I T
Keeporchestration outof code
Track status of data
and execution
Remove
redundant code

14. © 2019, Amazon Web Services, Inc. or its affiliates. All rights reserved.S U M M I T
AWSStepFunctions
“Serverless” workflow management with
zero administration
• Makes it easy to coordinate the components of
distributed applications and microservices
using visual workflows
• Automatically triggers and tracks each step
and retries when there are errors, so your
application executes in order and as expected
• Logs the state of each step, so when things do
go wrong, you can diagnose and debug
problems quickly
Task
Choice
Failure capture
Parallel tasks

15. © 2019, Amazon Web Services, Inc. or its affiliates. All rights reserved.S U M M I T
StepFunctions: Integrations
Simplify building workloads such as order processing,
report generation, and data analysis
Write and maintain less code; add services in minutes
More service integrations:
AWS Step
Functions
Amazon Simple
Notification
Service
Amazon Simple
Queue Service
Amazon
SageMaker
AWS Glue AWS Batch Amazon Elastic
Container Service
AWS Fargate

16. © 2019, Amazon Web Services, Inc. or its affiliates. All rights reserved.S U M M I T
Simpler integration,lesscode
With serverless polling With direct service integrationStart
End
AWS
Lambda
functions
Start
End
No
Lambda
functions

17. © 2019, Amazon Web Services, Inc. or its affiliates. All rights reserved.S U M M I T
Best
Practices

18. © 2019, Amazon Web Services, Inc. or its affiliates. All rights reserved.S U M M I T
Don’t startfromscratch
AWS
Chalice
AWS Amplify
AWS
SAM
AWS: Third-party:
Serverless
Framework

19. © 2019, Amazon Web Services, Inc. or its affiliates. All rights reserved.S U M M I T
SAMTemplate
Note to Cloudformation that it is a
SAM template
Create an AWS Lambda function with
an IAM policy, runtime, the code
available on zip file and the handler
to start.
Will create an event with API
Gateway and the path associated.
Create an Amazon DynamoDB with 5
RCU & WCU
AWSTemplateFormatVersion: '2010-09-09’
Transform: AWS::Serverless-2016-10-31
Resources:
GetHtmlFunction:
Type: AWS::Serverless::Function
Properties:
CodeUri: s3://sam-demo-bucket/todo_list.zip
Handler: index.gethtml
Runtime: nodejs8.10
Policies: AmazonDynamoDBReadOnlyAccess
Events:
GetHtml:
Type: Api
Properties:
Path: /{proxy+}
Method: ANY
ListTable:
Type: AWS::Serverless::SimpleTable

20. DEMO!

21. © 2019, Amazon Web Services, Inc. or its affiliates. All rights reserved.S U M M I T
aws.amazon.com/serverless

22. © 2019, Amazon Web Services, Inc. or its affiliates. All rights reserved.S U M M I T
https://secure.flickr.com/photos/dullhunk/202872717/

23. © 2019, Amazon Web Services, Inc. or its affiliates. All rights reserved.S U M M I T
Resources
Workshop serverless on Github:
https://github.com/aws-samples/aws-serverless-workshops
Twitter Bot on github (without layer):
https://github.com/aws-samples/aws-twitterbot-workshop
Power tuning for Lambda:
https://github.com/alexcasalboni/aws-lambda-power-tuning
Registration for AWS free workshop:
https://aws.amazon.com/fr/serverless-workshops/
Layers:
https://docs.aws.amazon.com/lambda/latest/dg/configuration-layers.html
https://github.com/mthenw/awesome-layers (languages, tools, monitoring)
Amplify:
https://aws-amplify.github.io/docs/