Mailman 3 July 2011 - Twisted

[Twisted-Python] Twisted Python 0.7.0 Prerelease Testing
by Glyph Lefkowitz Aug. 5, 2021

Aug. 5, 2021

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. ______ __ __ _____ _ _ | ____ | \_/ |_____] |_____| |… [View More]

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by Tamika May 1, 2019

May 1, 2019

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[Twisted-Python] [ANN] txZMQ released
by Andrey Smirnov July 21, 2014

July 21, 2014

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,… [View More]

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[Twisted-Python] regarding xml elements
by Raj kumar Oct. 2, 2013

Oct. 2, 2013

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 … [View More]

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[Twisted-Python] Get IP of connecting client in XMLRPC server
by Remy C. Cool April 28, 2013

April 28, 2013

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 … [View More]

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[Twisted-Python] http.Request and JSON
by Vincent Gulinao Jan. 25, 2012

Jan. 25, 2012

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] PB and FilePager
by Jonathan Stoppani Jan. 3, 2012

Jan. 3, 2012

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): … [View More]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 [View Less]

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[Twisted-Python] Moving Twisted off Trac and SVN to somewhere nicer
by Laurens Van Houtven Dec. 5, 2011

Dec. 5, 2011

Hi, As some of you may already know (either through a backchannel or because you talked to me at Europython), there has been some talk about moving Twisted way from Trac+SVN to somewhere that isn't Trac+SVN. A lot of the devs do like SVN. My guess is that that's mainly because they don't actually use SVN, they use Combinator, or something. On the other hand, I do think that Trac is pretty universally loathed, and it would be a good idea to get away from it. There's a few existing hosting … [View More]

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[Twisted-Python] Twisted Project Jobs Volunteer
by Adi Roiban Nov. 17, 2011

Nov. 17, 2011

Hi, I have been using Twisted for about 6 months and looking for ways in which I could help the project. I just read the announcement and I would like to volunteer for one of the Twisted jobs. I am familiar with bzr and git and for the beginning I would like to start with maintaining the version control mirrors (bzr and git) and if this will not consume all my free time, I would also like to take care of buildbot master and slaves (or some other job that you consider is more important). … [View More]

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[Twisted-Python] Question about "starving" the reactor
by Orestis Markou Sept. 30, 2011

Sept. 30, 2011

Hello, I have a question about the "best practices" on making callbacks and making sure you don't hog the reactor. So you pass a deferred to a client, who attaches a chain of callbacks that might probably do some CPU intensive stuff. How should one guard for that? The obvious solution to me for the server part would be to do reactor.callLater(0, d.callback, arg) insted of d.callback(arg) What about the client part? What would be the best way to have a chain of callbacks executed in such … [View More]

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[Twisted-Python] Reconnection to Serialport after connectionLost
by Rene Klootwijk Aug. 1, 2011

Aug. 1, 2011

I have written several daemons that listen to the serialport. Everything works well, however the serial port connections are actually USB connections over IP (using an USB network hub). This means the connection is lost once in a while which is detected and triggers the connectionLost method of the protocol. I tried numerous things to reconnect to the serial port but without success. When I reconnect to the serial port I doubt what to do with the reactor parameter, when I specify the current … [View More]

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[Twisted-Python] Adding introspection to xlmrpc server
by Justin Frost July 31, 2011

July 31, 2011

I'm trying the example found at: http://twistedmatrix.com/documents/current/web/howto/xmlrpc.html#auto3 And it doesn't seem to be working. The following test code fails: import xmlrpclibs = xmlrpclib.ServerProxy("http://localhost:8080")print s.listMethods() The error says that the listMethods method isn't defined. If I create an xmrpc server without twisted and add introspection, it works fine. Is there a problem with the example or am I doing something wrong? Thanks,Justin

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com July 31, 2011

July 31, 2011

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[Twisted-Python] Re-entrancy policy for the reactor
by Itamar Turner-Trauring July 28, 2011

July 28, 2011

I'm going to merge #5063 next time I have a few minutes when I'm more awake, which will mean my yak stack[1] is empty and I can go back to working on abortConnection(). As explained in http://twistedmatrix.com/trac/ticket/78, abortConnection() is like loseConnection(), except it doesn't wait until buffers are written out, it closes the connection immediately. The question is, how immediately? My current implementation, a bit like one of the half-close code paths, ends up calling … [View More]

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[Twisted-Python] Do you use producers with SSL or TLS?
by Itamar Turner-Trauring July 27, 2011

July 27, 2011

If so, I'd appreciate if if you could test your application against trunk Twisted (make sure you have a recent version of pyOpenSSL). I just landed some fixes to the new TLS implementation's producer code, and catching any problems before we release 11.1 would be good. Thanks!

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[Twisted-Python] runReactor tests vs. t.i.task.cooperate and other users of the global reactor
by Itamar Turner-Trauring July 27, 2011

July 27, 2011

Deep within the bowels of the new TLS code, cooperate() is used. Unfortunately, that uses the global reactor... which means it breaks in tests that create a new reactor instance. Should I just change the new TLS code to take in a reactor instance and pass it everywhere? Or, as part of the test framework, have runReactor override the global reactor instance? -Itamar

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[Twisted-Python] A new & improved IResource
by Laurens Van Houtven July 25, 2011

July 25, 2011

Hey! In relation to my recent getChild problem (specifically, I want to return deferred resources from it), it has become evident that IResource just won't cut it for a number of reasons and we should probably replace the API with something else. The issues we should take care of in this new API: 1. http://tm.tl/3711 (returning deferreds from render methods) 2. http://tm.tl/3621 (returning deferreds from getChild and friends) 3. http://tm.tl/288 (accessing uploaded data while in progress) … [View More]

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com July 24, 2011

July 24, 2011

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[Twisted-Python] XMLRPC, how to prevent stdout on post and get?
by hbd666 July 20, 2011

July 20, 2011

I have a simple xmlrpc server written using Twisted. Every time I get a request to it, stdout spits out something like the following: 2011-07-19 00:33:39-0700 [HTTPChannel,332,127.0.0.1] 127.0.0.1 - - [19/Jul/2011:07:33:38 +0000] "POST / HTTP/1.0" 200 128 "-" "xmlrpclib.py/1.0.1 (by www.pythonware.com)" How do I prevent this from happening? I also do not want this going to a log file either. Thanks anybody for your help!

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[Twisted-Python] New TLS Code *Could* Cause Problems
by Reza Lotun July 19, 2011

July 19, 2011

Hi All, I just wanted to fire a note about our experiences testing Twisted trunk (after _newtls.py landed) on some servers in our cluster, on PyOpenSSL 0.12. In our application (a twisted.web REST api endpoint), we make a lot of https calls to a SimpleDB Amazon AWS endpoint (sdb.amazonaws.com). At some point after a deployed test on some of our machines, we started getting our internel DNS requests to the sdb endpoint throttled (resulting in failures in most of our requests). Since every call … [View More]

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com July 17, 2011

July 17, 2011

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[Twisted-Python] question : Twistar
by bino oetomo July 15, 2011

July 15, 2011

Dear All .. Base on a need, I need to build a JSON-RPC to Postgres "bridge". For now, I try to take the ORM way, so I'm looking for ORM "engine" that work well with Twisted and support for Postgres as it's backend. First try I look into SqlAlchemy ... but there is a lot of talk that SqlAlchemy did not work well with Twisted. I found that Twistar have a support for postgres backend. All sample script I found only look like this : for MySQL driver ---Start---- from twisted.enterprise import … [View More]

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[Twisted-Python] Async-pep (again)
by Laurens Van Houtven July 14, 2011

July 14, 2011

Hey! So, some of you might remember my async-pep post a while ago. Some people correctly complained there was no code or text. There's some code and quite a bit of text now. In fact, it even has a PEP number (3153)! So I'm soliciting feedback again. There's an issue tracker that ideally describes what needs to be done: https://github.com/lvh/async-pep/issues Specifically, #21: https://github.com/lvh/async-pep/issues/21 (a basic implementation of an async api compatible protocol) and #22: … [View More]

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[Twisted-Python] how to implement a perspective broker client with reconnection
by gelin yan July 14, 2011

July 14, 2011

Hi All I plan to use pb to communicate between my processes. The question is how i am able to implement a pb client with some degrees of reliability. What i want is when getRootObject() fail sometimes, it can retry several times automatically. It seems docs doesn't mention this problem and I didn't find any hint from source code. Thanks gelin yan

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[Twisted-Python] FilesystemLock/DeferredFilesystemLock with NFS and multiple processes
by Alberto Donato July 14, 2011

July 14, 2011

Hi, I have a scenario in which I need to use a lock file to prevent multiple processes to run on the same directory concurrently. The processes could run on the same machine or on different machine, with a NFS filesystem. If I understand correctly FilesystemLock works fine with different processes on the same machine, but since it uses a symlink to PIDs to identify the lock owner, it is not guaranteed to be safe on NFS. Is this the only issue with this scenario? In this case I guess it could … [View More]

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