This document discusses building a mini game challenge for a soccer app using Python, AsyncIO, WebSockets, and Redis. It introduces the speaker as the organizer of KhmelnitskiyPy and CTO of Turfmapp, a soccer-focused meetup app. It then explains how AsyncIO allows asynchronous programming in Python without additional libraries. WebSockets enable real-time communication between server and clients. Redis is used as a high performance cache and store for publishing game state updates to clients over WebSockets.

1. Send Balls Into Orbit with
Python3, AsyncIO,
WebSockets, Redis and React
Taras Lyapun, KhmelnitskiyPy#1

2. About me
- Organizer of KhmelnytskyiPy
- CTO at Turfmapp.com
- Founder of Four-Eyes.IO

3. Turfmapp.com
• Find places and company to
play soccer
• Like meetup.com, but soccer
specific
• Like runkeeper.com, but for
team sports
• Chicago based startup, with
R&D office in Khmelnitskiy

4. What is this story
about?
- We had everything for players
before game
- But we didn’t have anything for
game
- Introduce - Mini Challenges

5. Send Balls Into Orbit with Python3, AsyncIO,
WebSockets, Redis and React

6. Send Balls Into Orbit with Python3, AsyncIO,
WebSockets, Redis and React

7. Python
• Simple
• Maintainable
• Powerful
• Great syntax
• Can be used for anything:
• web
• network
• math
• ML
• NLP
• etc
• Great community!

8. Send Balls Into Orbit with Python3, AsyncIO,
WebSockets, Redis and React

9. Python3
• New, modern version of
Language
• A lot of improvements
• Unicode everywhere
• Lazy by default
• One more thing…

10. Send Balls Into Orbit with Python3, AsyncIO,
WebSockets, Redis and React

11. AsyncIO
• Allows you to start event loop, and execute your code
asynchronously without additional libraries or frameworks
• So you can write your python code in both ways - sync
and async, depends on your task
• Allows you easy support thousands persistent
connections without threads overhead
• The best way to deal with network

12. Introduction to Asynchronous Programming
http://cs.brown.edu/courses/cs168/f12/handouts/async.pdf

13. PEP-0492

14. PEP-0492

15. Send Balls Into Orbit with Python3, AsyncIO,
WebSockets, Redis and React

16. WebSockets
• Full-duplex communication channel over TCP
• Allow you to have real-time communication between
server and client
• Supported by most browsers, but can be used also with
any client (ios, android, whatever)
• aiohttp handles it well

17. aiohttp

18. Send Balls Into Orbit with Python3, AsyncIO,
WebSockets, Redis and React

19. Redis
• Advanced Key-Value cache
and store
• Strings, hashes, lists, sets, etc
• Publish Subscribe
• High performance with good
enough level of persistency for
this task

20. asyncio-redis

21. Another Decisions
• Always send full state of game (everything needed to
display screen), instead of sending incremental updates -
easy and error prone
• How to deal with concurrency updates? - Some sort of
optimistic locks
• Use JSON for easy extending protocol
• Process all data through Redis - for easy scale

22. Send Balls Into Orbit with Python3, AsyncIO,
WebSockets, Redis and React

26. Thanks!