[Twisted-Python] Help implement protocol

[Keith Cheung (張國良)]

Hi all,

I want to implement some handshake protocol, say..

1. Client:	WhatDate
2. Server: 	5Aug
3. Client:	WhatYear
4. Server:	2006
5. Client:	WhatTime
6. Server:	1005

So, for the client:-  (pseudo code)
	def connectionMade():
		send "WhatDate"
		state = askingForDate
	def lineReceived(data):
		switch state:
			askingForDate:
				date = data
				send "WhatYear"
				state = askingForYear
				break
			askingForYear:
				year = data
				send = "WhatTime"
				state = askingForTime
				break
			askingForTime:
				time = data
				state = initialState
				disconnect

The switch case becomes gigantic as the protocol grow.  Instead of keeping states, are there better ways to implement?