Real-Time Django with Channels

PyCon Dhaka 2016 talks on Django Channels.

Transcript

1. Real-Time Django with Channels Md Arifin Ibne Matin arifin4web.github.io
2. Hi, I’m Md Arifin Ibne Matin • Software Engineer at • Foodie & Hobbyist Cook • Problem Solver, Programmer.
3. Django was getting ‘Old’ ! • We want rich web applications with real-time interactions. • Django primarily is a request/response based framework. • 3rd party solutions is needed for WebSockets.
4. Vanilla Django • Take a Request ..
 .. Return a Response. • Incompatible with WebSockets Source : https://blog.heroku.com/in_deep_with_django_channels_the_future_of_real_time_apps_in_django
5. Project: Channels … is a project to make Django able to handle more than just plain HTTP requests, including WebSockets and HTTP2, as well as the ability to run code after a response has been sent … Andrew Godwin • Django Core Developer • Creator of ‘South’ Adopted as an official Django project
6. Concepts • Interface server : handle different protocols. • Channel Layer: Deliver to Consumers. • Consumer: Consumes a message and take actions. Source : https://blog.heroku.com/in_deep_with_django_channels_the_future_of_real_time_apps_in_django
7. • An Ordered, first-in-first-out, at-most-once queue with expiry and delivery to only one listening consumer. • Identified by a unique unicode name. • In-Memory / IPC/ Redis. • Standard channel names:
 http.request
 websocket.connect
 websocket.receive
 websocket.disconnect • Clients have unique response channel (reply_channel):
 !http.response.ja24Rdj
 !websocket.send.EdsU230f • Group: Named set of channels to broadcast What is a Channel?
8. A consumer receives a message and sends zero or more messages. What is a Consumer? A view receives a request and sends single response. Request Response View Message Consumer Message Receive from channels, and send to them/groups. WebSocket/HTTP messages come with a reply_channel
9. Enough Talk, Lets use IT
10. pip install channels Add channels to INSTALLED_APPS Installation
11. Set Channel Layer backend and routing Some Configs
12. Routing Add channel routing (Usually in routing.py)
13. Write your appropriate consumer functions Consumers
14. Commentary (https://github.com/arifin4web/commentary) A simple application to demonstrate WebSocket Broadcasting using Django Channels. Anyone can add feeds/comments to any events and all the connected users will get live updates. ? localhost tunnel url here ? Demo
15. • PyCon 2016 Talk by Andrew Godwin • Abu Ashraf Masnun’s Blog post • Another great post by Jacob Kaplan-Moss. • And off course the Official Documentation. This Slide and other links will be published 
 on my website :
 
 http://arifin4web.github.io/talks/ Further
16. Thats it from me Questions?