Mailman 3 January 2014 - Twisted

[Twisted-Python] Buildbot downtime
by Tom Prince March 3, 2022

March 3, 2022

I am plannig to upgrade twisted's buildbot in the near future. In preperation for that, I am going to take down the production buildbot on Tuesday, June 26, around 1600 UTC[1]. During that time, the result of any builds done will be lost. Thus, I'd ask that people avoid committing to trunk during that time. I will send a reminder before I take down the buildbot both here, and on #twisted and #twisted-dev. Tom [1] http://timeanddate.com/worldclock/meetingtime.html?iso=20120626&p1=80&p2=22…

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[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] Better usage of Twisted on multi core processor
by Sumanth Puram March 13, 2015

March 13, 2015

Hi all, I have a twisted TCP server to listens to client, processes requests, do mysql database operations if needed (using adbapi Connection pool) and return the result. Before deploying this in production, I want to know right way to configure the server. Since twisted is single threaded, how can I leverage multiple cores of my production machine (which has 6 cores and 16 GB RAM) ? One approach that I thought of was to start multiple instances of twisted server on different ports. This … [View More]

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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] Declaring some new supported builders (platforms)
by exarkun＠twistedmatrix.com Jan. 30, 2014

Jan. 30, 2014

Hey guys, Please comment on <https://github.com/twisted-infra/twisted-buildbot- configuration/pull/4>. It changes the following builders/configurations from unsupported to supported: debian6-x86_64-py2.6 debian6-x86_64-py2.6-glib ubuntu-12.04-x86_64-py2.7 ubuntu-12.04-x86_64-py2.7-glib fedora19-x86_64-py2.7 Jean-Paul

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[Twisted-Python] Problem with txampq_helper ampqFactory: closing connections
by Andrew Francis Jan. 30, 2014

Jan. 30, 2014

Hi Folks: I need to maintain a programme that uses txampq_helper library ampqFactory. The current program does not close the connection to the underlying rabbitmq (the code is a mess). Can I simple call theampqFactory.protocol.transport.loseConnection()? Do I need to unregisterProducer() first (in ampqFactory, i see stuff like resumeProducing() so I assume it is a producer) Cheers, Andrew

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[Twisted-Python] Twisted VxWorks PBConnectionLost
by Toph Bei Fong Jan. 30, 2014

Jan. 30, 2014

Hello, I started few days ago to make Buildbot under VxWorks run. I ported Python and made a few changes in Buildbot and Twisted to make everything run. I'm using Twisted 9.0.0 and Python 2.7.6 Twisted version is a bit old because its not complex as the 13.0.0 and it made the work under QNX for example. In Buildbot there are few possibilities to make a Step: * FileUpload * FileDownload * ShellCommand * MasterShellCommand MasterShellCommand doesnt make any difference here since its … [View More]

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[Twisted-Python] Protocol for socket.io
by Andrew Francis Jan. 29, 2014

Jan. 29, 2014

Hi: I searched the archive but couldn't find an answer so here goes: I am also new to all this I need to write a server that receives socket.io requests. I see Twisted has support for WebSocket. I also see that the Tornado2 socket.io is used alongside Twisted (I didn't know that this was possible). I read that socket.io uses WebSocket whenever possible. I have just started to look at the js implementation of socket.io and the specification. I am trying to gauge how hard is it to write a … [View More]

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[Twisted-Python] Python Events Calendar (Now with Twitter feed)
by Laurens Van Houtven Jan. 29, 2014

Jan. 29, 2014

Hi Twisters, Marc-Andre Lemburg from the PSF has been taking care of a Python events calendar for a while. It now has a twitter feed making it easier to find new events. If you're doing any Python-related events, such as of course Twisted sprints, or maybe Python user group meetups, please don't hesitate to contact the PSF to get your event added. M.-A.'s e-mail as been forwarded below. hth lvh ---------- Forwarded message ---------- From: M.-A. Lemburg <mal(a)python.org> Date: Wed,… [View More] Jan 29, 2014 at 11:20 AM Subject: [psf-members-ann] ANN: Python Events Calendar - Now with Twitter feed To: PSF Members Announcements <psf-members-announce(a)python.org> [Please help spread the word by forwarding to other relevant mailing lists, user groups, etc. world-wide; thanks :-)] ________________________________________________________________________ ANNOUNCING Python Events Calendars - Now with Twitter feed maintained by the Python Software Foundation (PSF) and a group of volunteers ________________________________________________________________________ INTRODUCTION As some of you may know, the PSF has put together a team of volunteers who are maintaining a central Python events calendar. We currently have two calendars in place: * Python Events Calendar - meant for conferences and larger gatherings focusing on Python or a related technology (in whole or in part) * Python User Group Calendar - meant for user group events and other smaller local events The calendars are displayed on http://pycon.org/ and in a smaller version in the sidebar of the http://python.org/ website. You can subscribe to the calendars using iCal and RSS feeds and also embed the calendar widgets on your sites. Please see our wiki page for details: https://wiki.python.org/moin/PythonEventsCalendar The calendars are open to the world-wide Python community, so you can have local user group events, as well as regional and international conference events added to the calendars. ________________________________________________________________________ NEWS We have now created a Twitter feed for the calendars, which you can follow to get updates on all newly added events: https://twitter.com/pythonevents The tweets come with links to the event listings, which you can add to your own Google calendars with a single click. ________________________________________________________________________ ADDING EVENTS If you want to have entries added to those calendars, please write to events(a)python.org and include the following information: * Name of the event * Type of the event (conference, bar camp, user group, etc) * Focus on Python and approximate size * URL * Location and country * Date and time (if relevant) For recurring events, please also include a description of the recurrence in a way that's compatible and supported by Google calendars. ________________________________________________________________________ MORE INFORMATION More information on the calendars, the URLs, feed links, IDs, embedding, etc. is available on the wiki: https://wiki.python.org/moin/PythonEventsCalendar Enjoy, -- Marc-Andre Lemburg Director Python Software Foundation http://www.python.org/psf/ _______________________________________________ psf-members-announce mailing list psf-members-announce(a)python.org https://mail.python.org/mailman/listinfo/psf-members-announce [View Less]

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[Twisted-Python] twisted.web secured session cookies and multiple sites on same host
by Adi Roiban Jan. 28, 2014

Jan. 28, 2014

Hi, I am looking for the followings: * Force twisted.web to set session cookie as secured when HTTPS is used. * Allow 2 separate twisted.web Sites to run on same host/IP but with different sessions. I have checked the current code for getSession() [1] but i can see that session cookie is harcoded and I don't know how to use self.sitepath . I tried to search the code for sitepath, but I only got this comment, which I things is used to suppport some some sort of load balancing / high … [View More]

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[Twisted-Python] Weekly Bug Summary
by trac＠twistedmatrix.com Jan. 26, 2014

Jan. 26, 2014

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[Twisted-Python] Announcing pyOpenSSL 0.14a3
by exarkun＠twistedmatrix.com Jan. 23, 2014

Jan. 23, 2014

Hello all, I'm happy to announce the third alpha leading up to the release of pyOpenSSL 0.14. pyOpenSSL is the library Twisted uses for all of its SSL functionality. pyOpenSSL 0.14 is bringing some major changes compared to pyOpenSSL 0.13. Any and all testing is greatly appreciated. You can read more about the changes and download the source tarball from the github release page: https://github.com/pyca/pyopenssl/releases/tag/0.14a3 Feel free to leave feedback here, on a github … [View More]

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[Twisted-Python] Limit headers by size and not by number in twisted.web
by Adi Roiban Jan. 22, 2014

Jan. 22, 2014

Hi, I have checked twisted.web.http.HTTPChannel and I see that it limits the headers by number and not by size. https://github.com/twisted/twisted/blob/trunk/twisted/web/http.py#L1596 Maybe I don't see the big picture, but wouldn't this allow the server to load in memory a request with a single header of 1G ? Other than changing the HTTPChannel.lineReceived() implementation, is there a way to limit header size? I did a quick test and the server accepted an 1M cookie value without any … [View More]

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[Twisted-Python] PLEASE TEST: the new pyOpenSSL alpha release is a major change, and if you use TLS at all with Twisted you should test it
by Glyph Lefkowitz Jan. 21, 2014

Jan. 21, 2014

Hi everyone, Since this particular detail was in the middle of Jean-Paul's release announcement, I feel like it's important to draw attention to it. The new pyOpenSSL v0.14 is a substantial rewrite of all of pyOpenSSL's bindings to OpenSSL: while this rewrite should be a vast improvement, because eliminates lots of error-prone hand-written C code, replacing it with much smaller, much safer declarative C bindings via cffi, it also means that things are different now. Different means “possibly … [View More]

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[Twisted-Python] Twisted and symlink
by Toph Bei Fong Jan. 21, 2014

Jan. 21, 2014

Hello everyone, i was trying to port Python, Twisted, etc.. to VxWorks. My Problem now is: twisted/python/lockfile.py (import symlink). VxWorks doenst support symlink. My Questions are: * For what is the symlink used? * Can i disable them? * Is there an old version without symlink? Is there any other alternative or solution for the symlink? Best regards.

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[Twisted-Python] possible error in twisted app
by Jonathan Vanasco Jan. 20, 2014

Jan. 20, 2014

a portion of my twisted app is having some problems. i think i figured out the issue -- but if I'm right.. i'll be a bit lost. this portion of the app is essentially a web scraper. it grabs a batch of X urls from a data broker , and then updates a database with data about the URL ( which either comes from an oEmbed endpoint , a third party data provider, or scraping the page if needed ) there's a lot of code that would be messy to follow, so i'll just explain it as best as possible, and … [View More]provide some highlights. the underlying logic is basically this: reactor starts an UpdateLinksService, that checks for new batches every 30 seconds the UpdateLinksService has an internal marker to check if it's still processing the last batch - or if it's safe to process to process the urls, the UpdateLinksService runs them in a request wrapper , that is supposed to be run through a defer.DeferredSemaphore() service when i'm done with the batch, i clear out internal marker via a `deferred_list_finish` method. looking at some aggressive debugging output, it looks like my work to process a url is happening /after/ i call deferred_list_finish. in other words, i've somehow structured this so that i'm instantly finished. i *thought* i was running out of memory because i had some phantom deferreds running around. now i'm starting to think that i'm just stacking the queue faster than i work on it. i've tried changing things around and using different return values, but then started getting "exceptions.AssertionError:" because "assert not isinstance(result, Deferred)" ( twisted/internet/defer.py", line 381, in callback ) the following is a rough composite of what is going on. if anyone sees an obvious fix, i'd be greatly appreciative. thanks! ================= class UpdateLinksService(): def process_urls(self, urls): requests = [] for url in urls: wrapper = requestWrapper( self.semaphoreService, dbPool ) d = wrapper.queue_url(url) updates.append(d) self.d_list = defer.DeferredList( updates )\ .addCallback( self.deferred_list_finish ) class RequestWrapper(): def __init__(self, semaphore_service, dbPool): self.semaphoreService=semaphore_service self.dbPool = dbPool def queue_url( self, url ): self.url = url d = self.semaphoreService.run( self._to_thread ) return d def _to_thread( self ): d = threads.deferToThread( self._thread_begin ) return d def _thread_begin(self): worker = UrlWorker() d = self.dbPool.runInteraction( worker.process_url , self.url ) class UrlWorker(): def process_url(self,txn, url): #blocking stuff return True/False The reason why I have _to_thread + _thread_begin as 2 functions, and UrlWoker separate is for code re-use. The RequestWrapper functions are mostly all in a base class; i just subclass RequestWrapper and override _thread_begin and an error callback (not shown) UrlWorker's various methods are used througout my twisted daemon. [View Less]

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[Twisted-Python] Weekly Bug Summary
by trac＠twistedmatrix.com Jan. 19, 2014

Jan. 19, 2014

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[Twisted-Python] starting point to contribute
by Kasun Thennakoon Jan. 18, 2014

Jan. 18, 2014

Hi all, I'm kasun from srilanka, and i'm developing a vehicle tracking system for one of our government authorities,when i start coding for the project, I used the support of basic python modules(socket,threading)[1], then I got to know about the usability of Twisted and re-factored the code[2] to use Twisted because it's a great python network framework. so I have hands on experience with the framework.I'm happy to start contributing to twisted community.and i have already gone … [View More]

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[Twisted-Python] strategies for tracking down memory issues
by Jonathan Vanasco Jan. 18, 2014

Jan. 18, 2014

some recent changes to a very-happy twisted daemon have resulted in a process that grows in memory until it crashes the box. boo! looking through the code and logs, i'm wondering if i''ve coded things in such a way that defferds or deferrd lists are somehow not getting cleaned up if an unhandled exception occurs. i've been looking through all my former notes and some questions on stack overflow, and I've seen a lot of info on using heapy and other tools to find issues on a function-by-… [View More]

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[Twisted-Python] large features and code review
by Glyph Lefkowitz Jan. 17, 2014

Jan. 17, 2014

I've just put the fancy new logging branch into review that wsanchez and I have been working on for several months now. It's pretty big, and we've had difficulty with reviewing large changes in the past, so I suggested a novel review strategy: <https://twistedmatrix.com/trac/ticket/6750#comment:36> I am hopeful that this can provide the benefits of reviewing a whole feature all at once, which is to say, the ability for a reviewer to understand all of the changes in context, and also … [View More]

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[Twisted-Python] Maximum number of SSL connections to the server
by Sumanth Puram Jan. 14, 2014

Jan. 14, 2014

Hi all, I am doing load testing on my twisted SSL server. I spawn threads(~2000) from the application and each thread will act as a SSL client and connect to the server. Client code is straight forward. It creates a socket, does SSL wrap and connects to the server. Once all threads connect to the server, every thread closes its socket. During my initial tests, I found that after 245 successful connections, all remaining threads started to fail with this error on the client side. *SSLError: [… [View More]

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[Twisted-Python] Exit all threads upon KeyboardInterrupt
by johnnadre Jan. 14, 2014

Jan. 14, 2014

Hi, I want to exit my application immediately when CTRL+C is pressed, however reactor hangs when there are running threads. Some of these threads have blocking I/O, so I can't simply set a variable or wait for them to terminate. An example application would be: from twisted.internet import reactor, threads from time import sleep import signal def do(): try: sleep(10) except KeyboardInterrupt: print "interrupt!" #def cleanup(signum, stackframe): def cleanup(): d.… [View More]

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[Twisted-Python] Weekly Bug Summary
by trac＠twistedmatrix.com Jan. 12, 2014

Jan. 12, 2014

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[Twisted-Python] multiple log-in / perspective broker
by Daniel Sank Jan. 12, 2014

Jan. 12, 2014

Suppose I have a chat room application using perspective broker. Users log in with their credentials and gain access to some kind of lobby showing all available chat rooms. Now suppose entry into each chat room is precluded by another log in step. How do I implement that? I suppose I could make another realm and listen on another port but that seems wrong. -- Daniel Sank Department of Physics Broida Hall University of California Santa Barbara, CA 93117 (805)893-3899

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