[Twisted-Python] Help implement protocol

[Thomas Jacob]

Maybe you want to take a look at the FTPClientBasic class
in
http://twistedmatrix.com/trac/browser/trunk/twisted/protocols/ftp.py .

There the author basically uses a queue of actions (=hand shakes) to
be run, associating response lines to commands, and returning
the results via deferreds....

On Sat, 2006-08-05 at 11:44 +0800, Keith Cheung (張國良) wrote:
> 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?
> 
> 
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