Title Text
Intro
Why WSS and SSE?
Dragons vs. Unicorns
2016 NKO Winner
http://dragons.gomagames.com
The Gauntlet
RPG Hacking Simulation
https://the-gauntlet.gomagames.com
Server-Sent Events
WSS Frame
Data Format
Basic HTTP
for contrast
Protocol Design
- [CLIENT] Establish connection to server
- [CLIENT] SEND HTTP Request
- [SERVER] SEND HTTP Response
- [SERVER] CLOSE connection
HTTP Request HEADERS BODY
CLIENT
HTTP Response HEADERS BODY
SERVER
Live code HTTP
Open connection
Send Request
GET / HTTP/1.1
Receive Response
Connection Closed
CLIENT
SERVER
Receive Request
Send Response
HTTP/1.1 200 OK
Close Connection
Short Examples
- nc-http.sh
- node-socket.js
- node-http.js
- node-bidi.js
- node-broadcast.js
What would we do if we want to update the ui with current info from the server using HTTP?
Polling
while true do curl localhost:3000/api/game-events sleep 5 done
Live code WSS
Debug WSS
Slack WSS
Caveats
Live code SSE
Debug SSE
Caveats
WSS OP Payloads
Messages in Dragons vs. Unicorns
Abstractions and Alternatives
Colyseus
PubSub
Protobufs
Protocol Buffers
Discussion
- Other wss abstractions worth looking into?
- Have you run into issues using wss?
- Do you see benefits or use cases of SSE ?
- Anything new on the horizon that solves a similar problem?