Mailman 3 November 2003 - Twisted

[Twisted-Python] Woven web question about clearing http request.args
by Hegedus, Matthew S Nov. 5, 2003

Nov. 5, 2003

I've got multiple input buttons and their view is the same logic. The logic is delete some data on a button press, then rerender the page with the updated data. The data it will remove depends on the unique ID of the button pressed. When the web page is rerendered the view gets called for each button with the same http request, so the deletion logic will be evaluated for each button, even though it should be evaluated for just the button that was pressed. I don't like that. I want to clear … [View More]

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[Twisted-Python] form and submit
by vicky lupien Nov. 3, 2003

Nov. 3, 2003

I have a form with a submit button. I want to send my data from the form in a web page to an other web page. Also, I want to check if the data is correct. I'm new to twisted, so I need some help Vicky _________________________________________________________________ MSN Messenger : discutez en direct avec vos amis ! http://messenger.fr.msn.ca/

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[Twisted-Python] Dynamic form with twisted
by vicky lupien Nov. 3, 2003

Nov. 3, 2003

I really need help. I want to make a form dynamically. I don't want to use FormProcess and I do not understand very well how it works. If someone have documentation on forms (not the one on twisted matrix), it will be appreciated. Vicky _________________________________________________________________ MSN Messenger : discutez en direct avec vos amis ! http://messenger.fr.msn.ca/

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[Twisted-Python] design issue wrt exceptional events
by Dennis Allison Nov. 3, 2003

Nov. 3, 2003

I need a front-end to a complex of Zope systems. The front-end listens on an address/port and examines incoming http transactions, and, based upon http headers and other information, connects to one or another of the Zope systems. The underlying approach is straightforward -- a Listener waits for a http transaction, it spawns a receiver which gathers the message, decides what to do, spawns a sender to the destination. When the sender responds, the process is reversed. I currently use an … [View More]

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[Twisted-Python] Adapting RemoteReferences
by Sam Jordan Nov. 3, 2003

Nov. 3, 2003

Hi, What is the general opinion on having a standard way to adapt RemoteReferences to specific interfaces which basically just wraps callRemote for each respective method? The reason i'm bringing this up is I can imagine various use-cases for wanting to treat remote objects and local objects as semantically equivalent. For example, I may be employing the observer pattern for a simple system to separate UI components from data components. Currently if I wish to have both remote and local … [View More]observers interoperate I would have to either store them in separate data structures and treat each differently when sending notifications, or, I could store them in a single data structure and use appropriate type-checking to dispatch the calls. IMHO both of these solutions are relatively ugly. Whether or not there are sufficient use-cases for a standard twisted way to do this is another story, so i'm wondering what the views of people are on this subject. Certainly one could just register their own adapter for RemoteReference in each case, but the code to do this is rather ugly and for those that _do_ have to deal with such cases I think it would be nicer to have a simple, standard way of doing it, e.g. remoteRef.adaptTo(Interface). I've written a function that outlines the functionality I think it should provide which is included below; while this implementation is rather ugly i'm more worried about the idea rather than how it would eventually be implemented if someone decides this is worth having. Of course, there are certain constraints, such as the method wrappers having no way of knowing if the remote object actually implements the desired interface or not, but I don't see this as a problem for something that already requires string based dispatch. I guess you could say this proposal is somewhat similar to java's 'stub' approach, only it doesn't force it :-). Cheers, Sam. ------------------------------------------ import types class Interface: def add(x,y): pass def mul(x,y): pass class Interface2(Interface): def div(x,y): pass def sub(x,y): pass class Foo: def callRemote(self, name, *args, **kw): print 'calling %s with %s %s' % (name, args, kw) # this would likely put put in RemoteReference # to provide context def adaptTo(self, interface): # obtain all interface methods methods = interface.__dict__ for base in interface.__bases__: for attrib,val in base.__dict__.iteritems(): if not methods.has_key(attrib) and isinstance(val, types.FunctionType): methods[attrib] = base.__dict__[attrib] class _Adapter: def __init__(self, original): self.original = original for m in methods: exec "def %s(self, *args, **kw): return self.original.callRemote('%s', *args, **kw)" % (m,m) del _Adapter.m del _Adapter.methods return _Adapter(self) def test(): a = adaptTo(Foo(), Interface2) a.add(1,2) a.mul(2,4) a.div(8,4) a.sub(3,5) test() ------------------------------------------ [View Less]

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[Twisted-Python] Socket Read Write
by Ted Patrick Nov. 3, 2003

Nov. 3, 2003

I am writing a chat socket server and need to make sure that there are no conflicts when writing to other attached clients. I am concerned that when the server receives lots of messages from many socket connections, several sockets may encounter write contention. Is there a queue for the write method of a socket? Should one expect errors in this regard? Does the Twisted architecture eliminate this class of error? Using twisted.protocol.basic can 2 lineReceived events happen simultaneously? … [View More]

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[Twisted-Python] SNMPProtocol, request for review...
by Mike C. Fletcher Nov. 2, 2003

Nov. 2, 2003

I've built an SNMP Protocol for Twisted (based on a pattern from Patrick K. O'Brien), but as I'm a rather new Twisted developer, I'm wondering if someone more "in the know" could take a look at the package and see if I got the "ideas" right. That is, whether I'm going about the entire thing incorrectly/correctly, or whether I've missed anything that would be obvious to an experienced twisted developer. The protocol provides for sending get, getnext and getbulk requests, but doesn't yet … [View More]

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[Twisted-Python] connectTCP/listenTCP socks/ssh
by Kev Nov. 1, 2003

Nov. 1, 2003

I'm writing a socks proxy that uses ssh tunnels for connections, I can get it working by making my connectClass listenTCP with a forwarding.SSHListenForwardingFactory and then ClientCreator a SOCKSv4Outgoing to connectTCP, but obviously that's a bad method. How can I cut the listen/connect? Is there a way I can do it at that level or do I need to implement my own .connectSSH method? It seems I need to get both sides placed in the reactor somehow, but SSHChannel.conn doesn't have a fileno() … [View More]

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