Mailman 3 August 2008 - Twisted

[Twisted-Python] raw deferreds vs deferredGenerator vs inlineCallbacks
by Marcin Kasperski 13 Aug '08

13 Aug '08

I wrote a short example comparing the 3. Prepared it mostly for myself, but maybe it will be of some use for somebody: http://blog.mekk.waw.pl/archives/14-Twisted-inlineCallbacks-and-deferredGen… PS Crucial function: raw deferreds - 29 non-empty lines of code, deferredGenerator - 26 lines, inlineCallbacks - 17 lines -- ---------------------------------------------------------------------- | Marcin Kasperski | Systems built by humans are always subject | http://mekk.waw.pl | to human error. (Parnas) | | ----------------------------------------------------------------------

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[Twisted-Python] AsynQueue: return deferred from queued method
by Stephan Jaeger 12 Aug '08

12 Aug '08

Hello List, I'm trying to use AsynQueue for queuing requests for a synchronous protocol (emi/ucp). Is it possible to return a deferred from the queued method so the next method in the queue is only called after the deferred from the first was fired? Or is there a better way to handle synchronous protocols where i have to wait for an answer of a message sent over the wire before i can send another one? Thanks, Stephan

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[Twisted-Python] does setTcpNoDelay() not work?
by Gabriel Rossetti 12 Aug '08

12 Aug '08

Hello, I'm needing to send small packets to update a progress bar. My update msgs were all being sent in big packets, so I tried setting setTcpNoDelay() in connectionMade() but it doesn't change anything, is it broken? Thank you, Gabriel

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[Twisted-Python] foolscap copyable and constraint
by Marco Giusti 11 Aug '08

11 Aug '08

ciao! i'm playing a bit with foolscap and i try to use RemoteInterface to describe my constraint but i cannot understand how to use it with pass-by-copy. this is a small example: from foolscap import RemoteInterface, registerCopier, \ registerRemoteCopyFactory class Label: def __init__(self, text): self.text = text def copyLabel(label): return ('_Label', {'text': label.text}) registerCopier(Label, copyLabel) def makeLabel(state): label = Label(state['text']) return label registerRemoteCopyFactory('_Label', makeLabel) class RITest(RemoteInterface): def getLabel(): return Label but what i get is: foolscap.tokens.UnknownSchemaType: can't make constraint from '__main__.Label' (<type 'classobj'>) which is the correct way to define a constraint for a third party-class?

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com 09 Aug '08

09 Aug '08

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[Twisted-Python] Jython reactor - a proposal
by Alan Franzoni 09 Aug '08

09 Aug '08

Hello everybody, I recently took a look at the current Jython status, and it seems to me that the latest alpha provides a good compatibility towards the standard CPython. I'd really like running jython+twisted, so when I realized there was no reactor available for such platform I took some time to analyze the issue: - An old-and-incomplete java reactor existed in Twisted 1.3 which used java.io. - java.nio would be a better choice to implement such a reactor since java 1.4 - a wrapper around java.nio called EIO existed ( http://java.twistedmatrix.com/eio/ ) but there seems no way to take a peek at it since there's no file that can be accessed beyond its home page (every single link is broken :-( ) - a kind of async networking library called Apache Mina is avaiable for java, and it makes use of java.nio - other java-reactor pattern implementations are available around (e.g. assorted on sourceforge ). So, it seems java.nio is the right way to go and there's quite a lot of code around to look at. Since I'd like to code a java reactory, I've got some questions: - any other clue? Is there anything else I should look at before starting my code? - is there any way I could be given commit access to a private branch on twisted svn repository? i could set up a repo elsewhere, but this would make synchronization and merging a bit more painful and slow. - is there any other similar project ongoing by anyone else? Thanks! -- Alan Franzoni <alan.franzoni.xyz(a)gmail.com> - Remove .xyz from my email in order to contact me. - GPG Key Fingerprint: 5C77 9DC3 BD5B 3A28 E7BC 921A 0255 42AA FE06 8F3E

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[Twisted-Python] Interest in TIPC support?
by Peter Sabaini 08 Aug '08

08 Aug '08

Hi list, I'm currently in the process of hacking together TIPC[1] support for Twisted. I've got reliable datagram support in a "works for me" state now. Is anyone interested to see this in Twisted? Thought I'd rather ask here before opening a ticket etc. peter. [1] http://tipc.sourceforge.net/

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[Twisted-Python] Re: Error Request did not return a string
by DJ 05 Aug '08

05 Aug '08

Hello All, For some strange reason I this text is being added to the end of the html pages rendered by twisted. Request did not return a string Request: <GET /config/deleteSection HTTP/1.1> Resource: <configPages.deleteSection instance at 0x00EC4EE0> Value: None I am using the resource.Resource and render. My html is passed has a string using request.write. As far has I can tell, there should not be a problem. Does anyone know why and what I need to do to fix this. -- Dafina A. Abernathy (DJ)

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Re: [Twisted-Python] Permanent Object
by Terry Jones 05 Aug '08

05 Aug '08

>>>>> "JP" == Jean-Paul Calderone <exarkun(a)divmod.com> writes: JP> On Tue, 5 Aug 2008 17:13:41 +0530, Squzer Crawler <squzer(a)declum.com> wrote: >> I want to create a server in twisted that has a permanent variable which i >> want to use as the number of request requested to the server. When i use >> that for Protocol, each time the variable is created newly. >> >> Then i used >> *class Echo(Protocol): >> def dataReceived(self, data): >> >> if "data" not in dir(self.factory): >> self.factory.data = 0 >> self.factory.data = self.factory.data + 1 >> >> """As soon as any data is received, write it back.""" >> self.transport.write(data + str(self.factory.data)) >> >> but i want to remove the code that is: >> >> ** if "data" not in dir(self.factory): >> self.factory.data = 0 >> self.factory.data = self.factory.data + 1 >> >> How to do that? JP> Why? You said it's what you wanted. Hi JP I think Squzer meant that he'd like to put the initialization code elsewhere. Squzer, why not do the initialization of self.factory.data when the factory is created, and then increment the variable each time a connection is made? Is that what you meant? Terry

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[Twisted-Python] Permanent Object
by Squzer Crawler 05 Aug '08

05 Aug '08

I want to create a server in twisted that has a permanent variable which i want to use as the number of request requested to the server. When i use that for Protocol, each time the variable is created newly. Then i used *class Echo(Protocol): def dataReceived(self, data): if "data" not in dir(self.factory): self.factory.data = 0 self.factory.data = self.factory.data + 1 """As soon as any data is received, write it back.""" self.transport.write(data + str(self.factory.data)) but i want to remove the code that is: ** if "data" not in dir(self.factory): self.factory.data = 0 self.factory.data = self.factory.data + 1 How to do that? *

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