Mailman 3 December 2011 - Twisted

[Twisted-Python] Twisted Python 0.7.0 Prerelease Testing
by Glyph Lefkowitz 05 Aug '21

05 Aug '21

hi there, folks: I'd really like to release 0.7.0 but I would like it to be at least a little bit tested before I do so. Could those of you with CVS trees check everything out and see if it performs as advertised? Deeper bugs than that will have to wait for the next release, but I'd at least like to know if it works for someone other than me. Thanks. ______ __ __ _____ _ _ | ____ | \_/ |_____] |_____| |_____| |_____ | | | | @ t w i s t e d m a t r i x . c o m http://www.twistedmatrix.com/~glyph/

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01 May '19

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[Twisted-Python] [ANN] txZMQ released
by Andrey Smirnov 21 Jul '14

21 Jul '14

Hi! I would like to announce txZMQ, ZeroMQ bindings for Twisted. txZMQ is based on pyzmq and requires recent ØMQ version (>=2.1). txZMQ uses ØMQ APIs to get file descriptor that is used to signal pending actions from ØMQ library IO thread running in separate thread. txZMQ should be usable with any Twisted reactor. ØMQ is: * The socket library that acts as a concurrency framework. * Carries messages across inproc, IPC, TCP, and multicast. * Connect N-to-N via fanout, pubsub, pipeline, request-reply. * Fast enough for clustered products and supercomputing. * Asynch I/O for scalable multicore message-passing apps. Bridging ØMQ and Twisted makes a nice match: fast simple messaging between Twisted instances solving complex problems :) Links: * PyPi: http://pypi.python.org/pypi/txZMQ/ * Source code: https://github.com/smira/pyzmq * pyzmq: http://pypi.python.org/pypi/pyzmq * ØMQ: http://www.zeromq.org/ -- Andrey Smirnov, Qik Web Team Lead

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[Twisted-Python] regarding xml elements
by Raj kumar 02 Oct '13

02 Oct '13

Hi, I have an xml file in my application, I have created an element using Example goes like this......... document.createElement("abc") and i appeneded it by using append() method. But how i can reflect this change to my xml file? and one more thing is i want to create element with some other parameters.... like............. <abc m=" " n=" "> </abc> and i have m and n values as strings with me. can anybody help me to create this element and write it to the existing xml file as a child of an existing element? Thanks in advance.. Raj.. Forgot the famous last words? Access your message archive online at http://in.messenger.yahoo.com/webmessengerpromo.php

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[Twisted-Python] Get IP of connecting client in XMLRPC server
by Remy C. Cool 28 Apr '13

28 Apr '13

Hello, On 18 May 2004, the following message was posted to this mailinglist: Jp Calderone exarkun at divmod.com wrote: >Daniel Newton wrote: > > I have a simple XML-PRC server similar to the example below: > > from twisted.web import xmlrpc, server > > class Example(xmlrpc.XMLRPC): > """An example object to be published.""" > > def xmlrpc_add(self, a, b): > """Return sum of arguments.""" > return a + b def xmlrpc_whatIsMyAddress(self): return self.transport.getPeer().host > > if __name__ == '__main__': > from twisted.internet import reactor > r = Example() > reactor.listenTCP(7080, server.Site(r)) > reactor.run() > > I want to be able to get the address of the client that calls the xmlrpc > method can anyone help me with this? This solution didn't work because 'transport' isn't a property of the Example class. I'm currently in the process of changing from a customized SimpleXMLRPCServer to a twisted XMLRPC server solution and I need to insert the client IP into the attributes passed to the called xmlrpc method. Anyone who knows the answer and is willing to share the info? Regards, Remy

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[Twisted-Python] http.Request and JSON
by Vincent Gulinao 25 Jan '12

25 Jan '12

How do you read JSON content from a POST using http.Request. I peeked on args and it's empty. TIA.

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[Twisted-Python] I see, remote_method can also return a deferred. Perhaps we could document that?
by David Kao 10 Jan '12

10 Jan '12

I almost gave up choosing twisted until I found this explanation http://twistedmatrix.com/pipermail/twisted-python/2004-April/007517.html which basically says a remote_method can return a deferred. In this case, the PB server won't return the result of the Deferred back to the client until the server-side callback fires. The result of the remote_method is then returned to the client, which then triggers client side's deferred callback. So, I thought one of the following would be helpful: 1) An example showing remote_method returning a deferred and/or 2) A section named "Server side remote_* methods can be async by returning deferreds" could be added as a 7th item in http://twistedmatrix.com/documents/current/core/howto/pb-usage.html . I spent some quality 30+ hours carefully reading 90% of the http://twistedmatrix.com/documents/current/core/howto/index.html and I do not remember picking this subtlety up. (Or you can point me the right place in doc.) (great doc btw.) Should I submit an improvement ticket for this? I could also make the server side example using Echoer, remote_echo, and deferToThread just so that whoever fixes the ticket can just copy and paste. David Kao

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[Twisted-Python] ConnectionMixin.loseConnection (in _newtls) lacking arguments
by Saúl Ibarra Corretgé 04 Jan '12

04 Jan '12

Hi all, I'm experiencing a TypeError exception in my code since I updated to Twisted 11.1. After hunting it it seems to be caused because the loseConnection function from (_newtls) lacks arguments. If there is no OpenSSL support present in the system the loseConnection function will be called in abstract.FileDescriptor (please, correct me if I'm wrong), and the signature for loseConnection is the following: def loseConnection(self, _connDone=failure.Failure(main.CONNECTION_DONE)): Shouldn't it be the same for _newtls.ConnectionMixin ? Or perhaps it should accept *args and **kw and pass them on? Or am I wrong here? Thanks and regards, -- /Saúl http://saghul.net | http://sipdoc.net

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[Twisted-Python] PB and FilePager
by Jonathan Stoppani 03 Jan '12

03 Jan '12

Hi there, I encountered a problem while dealing with file transfers using PB and t.s.u.FilePager. The sscce illustrates the problem: --------- server.py -------------------------------------------------- from twisted.spread import pb from twisted.internet import reactor ROOT = '/tmp/' class ImageCollector(pb.Referenceable): def __init__(self, fd): self.fd = fd def remote_dummy(self): pass def remote_gotPage(self, page): self.fd.write(page) def remote_endedPaging(self): print "Completed" self.fd.close() class VurmController(pb.Root): def remote_createImage(self, imageId): return ImageCollector(open(ROOT + imageId, 'w')) reactor.listenTCP(8789, pb.PBServerFactory(VurmController())) reactor.run() ---------------------------------------------------------------------- --------- client.py -------------------------------------------------- import sys from twisted.spread import pb from twisted.internet import reactor, defer from twisted.spread import util FILE = 'myfile.something' factory = pb.PBClientFactory() reactor.connectTCP("localhost", 8789, factory) d = factory.getRootObject() def createImage(controller): return controller.callRemote('createImage', 'image-id') d.addCallback(createImage) def sendImage(ctl): print ctl.callRemote('dummy') ############# LINE 19 ############# d = defer.Deferred() util.FilePager(ctl, open(FILE), callback=lambda: d.callback(None)) return d d.addCallback(sendImage) def done(_): print "Transfer completed" #reactor.callLater(1, reactor.stop) reactor.stop() d.addCallback(done) reactor.run() ---------------------------------------------------------------------- I'm trying to *upload* a file from the client to the server by calling a method on the server which returns a collector to be used with a FilePager instance. When run with the line client.py:19 commented out, the script blocks before sending out any file chunks, if the line is uncommented (effectively calling the 'dummy' method remotely), everything works as expected. Digging around in the sources, I found out that t.p.u.Pager registers itself to the collector's pb broker as a pageProducer. When resumeProducing is called on the broker, it asks the FilePager instance for the next page, which leads to the invocation of the following method on FilePager:: def sendNextPage(self): """ Get the first chunk read and send it to collector. """ if not self.chunks: return val = self.chunks.pop(0) self.producer.resumeProducing() self.collector.callRemote("gotPage", val) As the t.b.FileSender producer does not yet had a chance to write something to the FilePager, the method returns straight away without sending anything. As anything was sent, the Broker.resumeProducing method is never called again, and thus the FilePager.sendNextPage neither. The problem is caused by the calling chain of the FilePager constructor: FilePager.__init__() -> Pager.__init__() -> broker.registerPageProducer(FilePager) -> transport.registerProducer(broker) -> broker.resumeProducing() -> FilePager.sendNextPage() -> <no data, don't send anything> -> FilePager.startProducing(fd) -> FileSender().beginFileTransfer(fd, FilePager) -> FilePager.registerProducer(FileSender) -> FileSender.resumeProducing() -> FilePager.write(data) -> <store data, wait for sendNextPage to be called> Simply inverting these two method calls (Pager.__init__ and FilePager.startProducing) solves the problem. The same problem does not appear when calling the 'dummy' method (client.py:19) because the data for the method call is waiting to be sent out by the reactor and the transport does not call 'resumeProducing' on the broker until the next iteration. This allows the call to FilePager.startProducing to complete before sendNextPage is ever called on it. Does this sound correct? It seems only strange to me that nobody else had this problem previously. If no errors on my side are found, I'll submit this as a ticket. Cheers, Jonathan

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[Twisted-Python] Unknown constants
by Ralph Meijer 30 Dec '11

30 Dec '11

Hi, I've been looking into using twisted.python.constants for representing the status codes of the XMPP Multi-User Chat protocol [1]. I will have objects representing messages, of which one of the attributes is 'mucStatuses', a set of status codes. This works out great for the initial set of available status codes. The protocol is parsed, and the status codes are represented by the ValueConstant instances returned by lookupByValue. However, not all of the possible codes can be known up-front, as the protocol allows for registering new ones without changing the specification itself. Eventually, applications will receive status codes that are not (yet?) part of the set of defined constants in the implementation, and application developers (that do know about new codes) will want to handle these. A possible remedy to would be to register new status codes from the application itself. My first try of just adding a new attribute to the class fails because they are not 'realized' as the _enumerants are cached. I can imagine this also goes for unknown HTTP methods and HTTP status codes, used as examples in the documentation. Any suggestions on how to handle such unknown constants? [1] <http://xmpp.org/extensions/xep-0045.html#statuscodes> -- ralphm

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