Mailman 3 May 2006 - 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]

4 5

[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]

3 3

[Twisted-Python] Problem: spawnProcess() never ending when installSignalHandlers=False
by Matt Feifarek Feb. 3, 2007

Feb. 3, 2007

Hello. I'm using Twisted 1.3.0 on python2.4 on an Ubuntu-Hoary x86 Linux box. I'm using twisted and spawnProcess() with a Queue structure to chain processes that need to be called (specifically, imagemagick commands). I use the "processEnded" event/method of t.i.p.ProcessProtocol to go from one task to the next. Twisted shares a python process with a multi-threaded web-app-kit (Webware) so it has to be run in a thread. This worked well on other older versions of twisted and older versions of … [View More]

6 14

[Twisted-Python] Service dependencies
by Matt Goodall July 10, 2006

July 10, 2006

Hi, I have a couple of services. The second is dependent on the first being fully initialised before the second gets set up. I thought that the order of Service startup was typically handled by organising services in a hierarchy, and that the startup of the hierarchy understood deferreds. I was wrong - service.Application is a MultiService and only understands deferreds in stopService. There's a DependentMultiService class in twisted.internet.app but that entire module has been deprecated. … [View More]

5 4

[Twisted-Python] Status of wxPython support in Twisted 2.1: use wxreactor
by Itamar Shtull-Trauring July 2, 2006

July 2, 2006

wxreactor in Twisted 2.1 uses threadedselectreactor. This means that wx apps ought to use wxreactor, not TSR directly; there are some issues with vanilla TSR wx integration that are also present in wxreactor, but will be fixed in future versions of wxreactor. What's broken (there may be more): 1. reactor shutdown events aren't handled correctly (e.g. Deferred returned from during-shutdown event). 2. Signal handling for e.g. Ctrl-C is caught by wx, not twisted. In order to get these fixed I … [View More]

3 7

[Twisted-Python] can pb.Copyable objects be compared for equality after a round trip?
by Robert Gravina June 28, 2006

June 28, 2006

Twisted-list, In an application I'm writing I would like all Perspective Broker clients to share some list of objects and have them all keep in sync when one of the clients updates an object's attributes (imagine say a shared address book - I'm not creating an address book, but it's easier than explaining the details of my app). I've created a pb.Cacheable class for the purposes of notifying clients when new objects are added to this list which works fine (I based this on the … [View More]

6 16

[Twisted-Python] PB and other distributed object protocols
by Stephen Waterbury June 17, 2006

June 17, 2006

Hi Gang, Preface: I'm not a protocol guru, or even a "distributed object" (DO) guru, so this message is from the point of view of a DO novice looking for insights from some of the twisted minions (/gurus) and other cybergods who hang out here. I've been monitoring Brian's work on newpb (PBng?), and I love everything about it. Except how long it's taking. :( Brian: I know you have a real job, too, so I completely understand! (Incidentally, you're the only one whose commit messages I save, … [View More]

5 8

[Twisted-Python] Synchronous Code Fishbowl
by Ed Suominen June 15, 2006

June 15, 2006

The dialogue copied below shows yet another example of the frustrations that arise when trying to bridge the chasm between Twisted and the synchronous rest of the world. This latest episode inspired the idea of a synchronous code fishbowl that offers well-behaved Twisted code a deferToQueue() method for running badly-behaved blocking code. See http://foss.eepatents.com/sAsync/browser/branches/syncbridge.py Comments? - Ed Suominen -------- Original Message -------- Michael Bayer wrote: &… [View More]gt; why are you using twisted *with* threads ? didnt we all agree that was > sort of unnecessary ? Twisted operates without needing to run *in* a thread by doing everything asynchronously. Every call made via the Twisted event loop must either return (synchronous) results very quickly or return an immediate reference to an eventual result (thus operating asynchronously). The objects that hold those immediate references are called "deferreds" in TWisted parlance. Twisted runs most all of its internal operations with appropriate chunking and use of select() to keep the asynchronous event loop humming along nicely, but it has no control over how other libraries do things. When an external library like SQLAlchemy presents a blocking call like select(...).execute.fetchall(), the only way to make that call "play nice" with Twisted by immediately returning a deferred to the eventual result is by having TWisted run it in a thread. It includes the deferToThread() function for that express purpose. > (this goes to my point that twisted is a pain in the butt...) Perhaps, but asynchronous code is a whole different way of thinking that some of us actually find cleaner and more intuitive than blocking + threads. What I'm trying to do with sAsync is put the "pain in the butt" associated with making synchronous and asynchronous code work together firmly behind the scenes for Twisted users, at least as far as interacting with SQLAlchemy is concerned. > anyway, SA 0.2 uses the same idea for sqlite threading as 0.1....it > maintains each connection thread locally since you cant share a sqlite > connection between threads. im also not sure what youre talking about > with a "thread local copy of the engine", if thats something youre doing > on your end, you might want to not do that. use Connection objects > instead theyre much more portable. Mike, I remember you telling me a while ago that SA somehow figures out how to make things work with the engine. That was after I spent a lot of time trying to re-engineer the wheel, to great frustration on my part. I followed your advice, ditched my thread-local code, and got SA transactions just fine (based on the engine) to run in arbitrary threads. Now it's not working in SA 0.2. Could you point out what's changed in regard to the engine vs. threads vs. sqlite? I'd rather not change everything under the hood (e.g., using connections somehow) if I don't have to. The lesson of not trying to re-engineer what SA handled fine on its own is still with me. :-) Best regards, Ed > On May 27, 2006, at 6:57 PM, Ed Suominen wrote: > >> My sAsync project relies on Twisted to maintain a thread pool. It runs >> database transactions in some available thread via Twisted's >> deferToThread() function. See the transact function in >> http://foss.eepatents.com/sAsync/browser/trunk/sasync/database.py for >> details. >> >> That arrangement created no problem with SQLite and SA 0.1, even though >> SQLite does not allow sharing of connections between threads. Somehow, >> SA 0.1 made the transaction run in its thread with a thread-local copy >> of the engine and table that was created in the main thread. I never >> figured out how, but it just worked. >> >> It doesn't work in SA 0.2, however. I either get the error when trying >> to use the main-thread table in the threaded transaction, or have no >> table available in the thread because it wasn't created there. Now I'm >> trying to figure out how to put humpty dumpty back together again. Any >> suggestions? >> >> Best regards, Ed [View Less]

6 14

[Twisted-Python] twisted and PyQt4
by scalet＠yebu.de June 10, 2006

June 10, 2006

Hi, it seems to me, there is no reactor for PyQt4 yet. What is the preferred way to have a PyQt4 application using the famous twisted framework for networking. Thanks for any hints. Karl

9 15

[Twisted-Python] Do Twisted support LMTP servers?
by Jesus Cea June 7, 2006

June 7, 2006

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Twisted is very extensive in protocol support, managing smtp, pop3 and imap4, for example. I was wondering if there is any LMTP server project out there. It should be fairly simple, since LMTP is very very similar to usual SMTP. I need to use LMTP for a local project, and I was wondering if tiwsted could be used to fill this gap. - -- Jesus Cea Avion _/_/ _/_/_/ _/_/_/ jcea(a)argo.es http://www.argo.es/~jcea/ _/… [View More]

2 4