Apply here: https://spark-solutions.workable.com/jobs/833497 What? Recurring 2-hour workshops on Thursday at 18.30 in Spark’s office at Jasna 15 (started on October 25th) and happening every week, according to the schedule. Each workshop will have separate topic and consist of a live coding session / devops with some homework for the participants, to be submitted for review and feedback (not mandatory). For whom? For Junior and Mid RoR developers Why? Free RoR workshops with Senior Developers on interesting topics - improve your dev skills, gain some experience, make new friends! Mentors Piotr Leniec - Senior Fullstack Dev at Spark Solutions Yuriy Kushnir - Senior RoR Dev at Spark Solutions Bogusław Tolarz - Senior RoR Dev at Spark Solutions Nathaniel Nande - Senior RoR Dev at Spark Solutions Alexey Suslyakov - Senior RoR Dev at Spark Solutions Przemysław Kossakowski - Ruby backend developer at Spark Solutions Sergey Vygovsky - Senior RoR Dev at Spark Solutions How to enroll? 1. Book some time 2/ Complete an evaluation task: Create a simple URL shortener using Rails or any other Ruby Web Framework and deploy it to Heroku.The user should be able to paste a link of any length and convert it to a short 8-character URL. Provide a link to Github / BitBucket repo & a link to a deployed website on Heroku. 3. Submit your application with a link to your task solution 4. Wait a bit for our reply 5. Code! Seats are limited, so apply now! We’ll be selecting the most promising candidates. Schedule & Topics* Completed workshops: 02/07/2019 Microservices in Ruby and Amazon Lambda 10/25/2018 PORO objects & their usage 11/8/2018 AWS/Heroku/DevOps 11/22/2018 Railway Oriented Programming 12/6/2018 Newest Rails Features 01/10/2019 Rails Performance Optimization 01/24/2019 Payment Provider Integration * Some workshops will be delivered in English Apply TODAY! Number of seats is limited. Snacks and drinks are on us :) https://spark-solutions.workable.com/jobs/833497

1. goo.gl/NcqrBp

2. Microservices in Ruby
and Amazon Lambda
!2
goo.gl/NcqrBp

3. (…) the microservice architectural style is an approach to
developing a single application as a suite of small services,
each running in its own process and communicating with
lightweight mechanisms, often an HTTP resource API. These
services are built around business capabilities and
independently deployable by fully automated deployment
machinery. There is a bare minimum of centralized
management of these services, which may be written in
different programming languages and use different data
storage technologies.
Martin Fowler
https://martinfowler.com/articles/microservices.html
!3

4. WAT?
MONOLITH
React (webpacker)
Cart
Catalog
Tax calculations
Promo calculations
React
(webpack)
CART CATALOG
TAX
CALCULATIONS
PROMO
CALCULATIONS
!4

5. Pros
• Simple
• Decentralized
• Isolation
• Super fast deployments
• Few small teams
• Few small apps instead of one monolith
• Many technologies
!5

6. • Simple
• Decentralized
• Isolation
• Super fast deployments
• Few small teams
• Few small apps instead of one monolith
• Many technologies
Cons
• Simple
• Decentralized - many monitoring tools
• Isolation - many config files
• Super fast deployments - but many
• Few small teams
• Few small apps instead of one monolith
• Many technologies
!6

7. scalability Optimize your app
!7

8. File.open do
while row = csv.shift
end
https://dalibornasevic.com/posts/68-processing-large-csv-files-with-ruby
File.read('data.csv')
while row = csv.shift
1 mln row csv
Time: 9.73
Memory: 74.64 MB
Time: 9.88
Memory: 0.58 MB
!8

9. Communication
• HTTP
• Redis
• RabbitMQ
• Mail ¯_(ツ)_/¯
!9

10. Payload
{ JSON }
APP SERVICE
!10

11. Example 1
APP
QUEUE
SERVICE 0
QUEUE
SERVICE 1
QUEUE
SERVICE 2
!11

12. Example 1
APP
SERVICE 0
QUEUE
SERVICE 1 SERVICE 2
!12

13. Amazon Lambda
since 29 NOV 2018
!13

14. Serverless
WOW!!!
* in my opinion
!14

15. Serverless
APP development
Company
• Deployment scripts
• Server configuration
• Server security
• Hardware
• Other devops stuff
Outside
!15

16. Communication
• API Gateway
• AWS IoT
• Application Load Balancer
• CloudWatch Events
• CloudWatch Logs
• CodeCommit
• Cognito Sync Trigger
• DynamoDB
• Kinesis
• S3
• SNS
• SQS
SERVICE
In lambda
!16

17. Deployment
• Inline editor
• Zip file
• File from s3
• AWS cli
!17

18. Debugging
• AWS Cloud Watch
• AWS Kinesis
• Offline debugging

19. Do I need
microservices?

20. Sidekiq
!20
MONOLITH
React (webpacker)
Cart
Catalog
Tax calculations
Promo calculations
App
CART
CATALOG
TAX
CALCULATIONS
PROMO
CALCULATIONS
SIDEKIQ

21. Questions?
!21

22. • http://howtocookmicroservices.com
• https://martinfowler.com/articles/microservices.html
• https://dalibornasevic.com/posts/68-processing-large-csv-
files-with-ruby
• https://aws.amazon.com/blogs/compute/announcing-ruby-
support-for-aws-lambda/
• http://rubyonjets.com/
!22

23. require 'json'
def lambda_handler(event:, context:)
{ statusCode: 200, body: event['a'].to_i + event['b'].to_i }
end
{
"a": "1",
"b": "2"
}
Code
Test json

24. require 'json'
def lambda_handler(event:, context:)
data = JSON.parse(event['body'])
{ statusCode: 200, body: data['a'].to_i + data['b'].to_i }
end
Fixed code

25. require 'json'
def lambda_handler(event:, context:)
if event['body']
data = JSON.parse(event['body'])
else
data = event
end
{ statusCode: 200, body: data['a'].to_i + data['b'].to_i }
end
Fixed code v2