Talk from berlinjs 18. April 2013

1. How to implement
WebSockets
in nodejs
Freitag, 19. April 13

2. Why actually implement a protocol?
bad support
want to learn more
too much time
Freitag, 19. April 13

3. WebSocket Overview
http upgrade
data framing
Freitag, 19. April 13

4. http upgrade
Request
GET ws://localhost:3000/ HTTP/1.1
Host: localhost:3000
Origin: http://localhost:3000
Upgrade: websocket
Connection: Upgrade
Sec-WebSocket-Key: balUGY40R1lyHPJZf3XHqQ==
Sec-WebSocket-Extensions: x-webkit-deflate-frame
Sec-WebSocket-Protocol: chat
Sec-WebSocket-Version: 13
Response
HTTP/1.1 101 Switching Protocols
Upgrade: websocket
Connection: Upgrade
Sec-WebSocket-Accept: GCPOtLmN+iCXPREPmHfgCKsCllU=
Sec-WebSocket-Extensions: x-webkit-deflate-frame
Sec-WebSocket-Protocol: chat
Sec-WebSocket-Version: 13
Freitag, 19. April 13

5. data framing
unmasked text frame containing „Hello“
10000001 0x81
FIN: Boolean
RSV1: Boolean 00000101 0x05
RSV2: Boolean
RSV3: Boolean 01001000 0x48 H
OPCODE: Number
MASK: Boolean 01100101 0x65 e
LENGTH: Number
MASKING: Buffer 01101100 0x6c l
PAYLOAD: Buffer
01101100 0x6c l
01101111 0x6c o
Freitag, 19. April 13

6. Freitag, 19. April 13

7. Architecture: First Take...
WebSocketServer WebSocketClient
WebSocketUpgrade
WebSocketBase
WebSocket
WebSocketFrame
Socket
Freitag, 19. April 13

8. Freitag, 19. April 13

9. Architecture: Second Take
WebSocketServer
WebSocketUpgrade
WebSocketSocket
Incoming Outgoing
WebSocketCore
WebSocketParser
Socket
Freitag, 19. April 13

10. End
only use ws for chat-like use-cases
use streams where you can
don`t worry v8 is fast enough
https://github.com/bodokaiser/node-websockets
Freitag, 19. April 13