Implement server push in flask framework

•

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Chi-Chia Huang

Technical Session in HDE

Software

Implement Server Push
in
Chi-Chia Huang (黃啟嘉)
Oct 24 2014

Flask is a microframework for Python based on Werkzeug, Jinja 2

Server Push Approaches
• Polling
• Long Polling
• Server Sent Events
• Websocket
http://mrjoes.github.io/2013/06/21/python-realtime.html
6

Time Server/Client
polling, long polling, server sent events, websocket
7

Polling
Noise to signal ration is usually very high…
8
Client

Long Polling
10
Server
use POST to prevent the browser
from cache the request

Server Sent Events
12
Server
The event stream is a simple stream of text data,
which must be encoded using UTF-8. Each
message is separated by a pair of newline
characters.
https://developer.mozilla.org/en-US/docs/Server-sent_events/Using_server-sent_events#Event_stream_format

Event Stream Example
https://developer.mozilla.org/en-US/docs/Server-sent_events/Using_server-sent_events#Event_stream_format
13

Which one is better?
17
• Server-Sent Events
• Are sent over traditional HTTP
• Automatic reconnection
• Ability to send arbitrary events
• WebSockets
• Bi-directional, full-duplex communication

Chatroom Example
• Polling approach:
• http://chichia.aws.prd.demodesu.com:5002/type/polling
• Long Polling approach:
• http://chichia.aws.prd.demodesu.com:5002/type/lpolling
• Server Sent Event approach:
• http://chichia.aws.prd.demodesu.com:5002/type/sse
• Websocket approach:
• http://chichia.aws.prd.demodesu.com:5002/type/ws
18

Intern Training Project
• http://chichia.aws.prd.demodesu.com:8080/
19

References
• Long Polling
• Jonathan Eunice lpoll
• AlanYang gevent-flask-comet
• Websocket
• Jonathan Eunice flask-ws-example
• Server Sent Event
• Oskar Blom Realtime Server Using The SSE Protocol
• Eric Bidelman Stream Updates with Server-Sent Events
• MDN Using Server Sent Event

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Implement server push in flask framework

1. Implement Server Push in Chi-Chia Huang (黃啟嘉) Oct 24 2014

2. Flask is a microframework for Python based on Werkzeug, Jinja 2

3. Notification from server 3

4. client Server 4

5. client Server 5

6. Server Push Approaches • Polling • Long Polling • Server Sent Events • Websocket http://mrjoes.github.io/2013/06/21/python-realtime.html 6

7. Time Server/Client polling, long polling, server sent events, websocket 7

8. Polling Noise to signal ration is usually very high… 8 Client

9. Long Polling 9 Client

10. Long Polling 10 Server use POST to prevent the browser from cache the request

11. Server Sent Events Client 11

12. Server Sent Events 12 Server The event stream is a simple stream of text data, which must be encoded using UTF-8. Each message is separated by a pair of newline characters. https://developer.mozilla.org/en-US/docs/Server-sent_events/Using_server-sent_events#Event_stream_format

13. Event Stream Example https://developer.mozilla.org/en-US/docs/Server-sent_events/Using_server-sent_events#Event_stream_format 13

14. 14

15. Websocket[RFC6445] Client 15

16. Websocket[RFC6445] 16 Server

17. Which one is better? 17 • Server-Sent Events • Are sent over traditional HTTP • Automatic reconnection • Ability to send arbitrary events • WebSockets • Bi-directional, full-duplex communication

18. Chatroom Example • Polling approach: • http://chichia.aws.prd.demodesu.com:5002/type/polling • Long Polling approach: • http://chichia.aws.prd.demodesu.com:5002/type/lpolling • Server Sent Event approach: • http://chichia.aws.prd.demodesu.com:5002/type/sse • Websocket approach: • http://chichia.aws.prd.demodesu.com:5002/type/ws 18

19. Intern Training Project • http://chichia.aws.prd.demodesu.com:8080/ 19

20. References • Long Polling • Jonathan Eunice lpoll • AlanYang gevent-flask-comet • Websocket • Jonathan Eunice flask-ws-example • Server Sent Event • Oskar Blom Realtime Server Using The SSE Protocol • Eric Bidelman Stream Updates with Server-Sent Events • MDN Using Server Sent Event

21. & 21

Implement server push in flask framework

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Implement server push in flask framework