[Twisted-Python] Help implement protocol
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?
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:
On Sat, Aug 05, 2006 at 11:44:44AM +0800, Keith Cheung (張國良) wrote:
Twisted code often uses dynamic method dispatch to methods with prefixed names like this: def connectionMade(self): self.sendLine('WhatDate') self.state = 'askingForDate' def lineReceived(self, line): handler = getattr(self, 'state_' + self.state) handler(line) def state_askingForDate(self, line): self.date = line self.sendLine('WhatYear') self.state = 'askingForYear' ... -Andrew.
On 8/4/06, Keith Cheung (張國良) <keith.cheung@lkmachinery.com.hk> wrote:
I know this expands the scope of what you have to learn, but look at State Machine Compiler. You can create a single object, and then generate all the state management code from SMC. -- If you don't know what you want, you probably need a nap.
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:
On Sat, Aug 05, 2006 at 11:44:44AM +0800, Keith Cheung (張國良) wrote:
Twisted code often uses dynamic method dispatch to methods with prefixed names like this: def connectionMade(self): self.sendLine('WhatDate') self.state = 'askingForDate' def lineReceived(self, line): handler = getattr(self, 'state_' + self.state) handler(line) def state_askingForDate(self, line): self.date = line self.sendLine('WhatYear') self.state = 'askingForYear' ... -Andrew.
On 8/4/06, Keith Cheung (張國良) <keith.cheung@lkmachinery.com.hk> wrote:
I know this expands the scope of what you have to learn, but look at State Machine Compiler. You can create a single object, and then generate all the state management code from SMC. -- If you don't know what you want, you probably need a nap.
participants (4)
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Andrew Bennetts -
jarrod roberson -
Keith Cheung (張國良) -
Thomas Jacob