Mailman 3 April 2016 - 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. ______ __ __ _____ _ _ | ____ | \_/ |_____] |_____| |_____| |_____ | | | | @ 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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[Twisted-Python] Changes to Twisted's Trac (GitHub Authentication)
by Amber "Hawkie" Brown May 2, 2016

May 2, 2016

Hi everyone, If you've ever had your password eaten by our Trac instance, had your comment rejected by spambayes, or seen the amount of effort it takes removing random nulls from our htpasswd files, rejoice! With https://github.com/twisted-infra/braid/pull/192 , we are moving our Trac instance to log in using GitHub OAuth. This should mean we solve the issue of keeping passwords (making you and us more secure), being able to turn off the spam filter (as we don't have anonymous ticket submittal, and github is better at catching spammers than we are), and hopefully cause less ongoing issues with passwords suddenly not working. What this means for you is that your username and password will no longer work for logging into our Trac, you will need to authorise your GitHub login to access it. This means that you may have another username, please contact me privately and I will see what I can do about migrating any ticket histories over, if you feel like it is needed. - Amber

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[Twisted-Python] twisted listening on UDP port, why?
by Jonathan Vanasco April 25, 2016

April 25, 2016

I'm trying to lock down a box, and came across a peculiarity with a twisted dameon -- it's binding to 0.0.0.0 for UDP on an arbitrary port I can'f figure out why this is happening -- I'm not consciously/explicitly using anything on UDP, and the port changes every time I start up a daemon. Does anyone have a clue what it could be?

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[Twisted-Python] IPv6 comparison handling
by Maciej Wasilak April 25, 2016

April 25, 2016

Hello, In my UDP Twisted based library there is a problem with IPv6 addresses representation. Addresses are compared as simple strings, and it sometimes causes mismatches: "fe80::aaaa:bbff:fecc:dddd" should be equal to "fe80:0000:0000:0000:aaaa:bbff:fecc:dddd" I've noticed that Python 3 has nice new module "ipaddress" exactly for this kind of problems, and it has been backported to Python 2.7. Before I add it as a new dependency I wanted to ask if maybe Twisted has some other suggested solution for this problem? Best Regards Maciej Wasilak

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[Twisted-Python] waiting on any deferred in a list?
by Benjamin Rutt April 24, 2016

April 24, 2016

Hi all, I've been using a pattern for quite some time to collect a bunch o' deferreds in a list and then yield on them one at a time. Here is some untested pseudocode: --- @defer.inlineCallbacks def foo( ls ): defs = [] # get all the deferreds going for item in ls: d = some_deferred_returning_function( item ) defs.append( ( item, d ) ) # associate item with deferred # process results not as they come in but in the original order for ( item, d ) in defs: result = yield d print 'The result on item', item, 'is', result --- In this way, I can get good concurrency (by spinning up all deferreds at once) but also I can iterate on the results using a straightforward traversal of the list data structure and yield. This is working great for me. But on occasion I'd prefer that I can access the results not in the order that I originally got, but rather in the order of completion of the deferreds, so the faster ones come in first, and the slower ones don't hold up faster ones. The usual case when I'd want this is when I have "slower" deferreds near the front, and "faster" deferreds near the back. I can't help but think that there's some async data structure out there for me that can solve this. I've used DeferredList before, and I can't see that it does what I want: it gives you a choice between getting all results only when they are all done (default behavior), or getting the first one that's ready (fireOnOneCallback=True). I want all results, but I want the processing of the results to unfold as the results come in. Thanks for any ideas. -- Benjamin Rutt

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[Twisted-Python] Cause epollreactor to busyspin
by Tim Hughes April 21, 2016

April 21, 2016

Hi All, I have a latency sensitive application that gets affected when it is moved between cores or the system has to wake from idling. I would like to run the thread in as tight a loop as possible and to do this i need to cause epollreactor to busyspin on receiving data. I have worked out how to do it by editing the twisted code directly by hard coding the value of `timeout` to be 0 at this location in the code https://github.com/twisted/twisted/blob/f074ba3d5083aa1503abcf194aece327e7f… Is it possible to actually set this on the reactor in a more sensible way so I don't need to patch the twisted codebase. ? Below is basically what I am doing. ``` def doPoll(self, timeout): """ Poll the poller for new events. """ + timeout = 0 - if timeout is None: - timeout = -1 # Wait indefinitely. try: ``` Cheers Tim Hughes

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[Twisted-Python] Crochet 1.5.0: Use Twisted in Django, Flask, or anywhere else
by Itamar Turner-Trauring April 15, 2016

April 15, 2016

Do you wish you could: * Use the power of Twisted's asynchronous networking in Django, Flask, or other threaded applications? * Provide a blocking API powered by Twisted underneath, without exposing it to the caller? * Write a library that provides APIs both for Twisted and non-Twisted applications? * Use threads more easily inside Twisted applications? Crochet lets you do all that, and more, by hiding and automatically starting the Twisted reactor and providing a blocking API for calling into Twisted. If you need to use your library from a normal Twisted application you can disable the auto-start functionality. Here's an example of using Twisted in a blocking manner: from __future__ import print_function from twisted.names import client from crochet import setup, wait_for setup() @wait_for(timeout=5.0) def gethostbyname(name): """Use the Twisted DNS library.""" d = client.lookupAddress(name) d.addCallback(lambda result: result[0][0].payload.dottedQuad()) return d if __name__ == '__main__': # Application code using the public API - notice it works in a normal # blocking manner, with no event loop visible: import sys name = sys.argv[1] ip = gethostbyname(name) print(name, "->", ip) New in 1.5.0 is official Python 3.5 support; Python 2.6, 3.3 and older versions of Twisted are no longer officially supported (but are likely to still work). If you need help using Crochet (or just general Twisted or Python help) I am currently available for short-term consulting. You can read the documentation at https://crochet.readthedocs.org/. --Itamar Turner-Trauring

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[Twisted-Python] Twisted 16.1 Release Announcement
by Amber "Hawkie" Brown April 12, 2016

April 12, 2016

On behalf of Twisted Matrix Laboratories, I am honoured to announce the release of Twisted 16.1! This release is hot off the heels of 16.0 released last month, including some nice little tidbits. The highlights include: - twisted.application.internet.ClientService, a service that maintains a persistent outgoing endpoint-based connection -- a replacement for ReconnectingClientFactory that uses modern APIs; - A large (77% on one benchmark) performance improvement when using twisted.web's client on PyPy; - A few conch modules have been ported to Python 3, in preparation for further porting of the SSH functionality; - Full support for OpenSSL 1.0.2f and above; - t.web.http.Request.addCookie now accepts Unicode and bytes keys/values; - `twistd manhole` no longer uses a hard-coded SSH host key, and will generate one for you on the fly (this adds a 'appdirs' PyPI dependency, installing with [conch] will add it automatically); - Over eighteen tickets overall closed since 16.0. For more information, check the NEWS file (link provided below). You can find the downloads at <https://pypi.python.org/pypi/Twisted> (or alternatively <http://twistedmatrix.com/trac/wiki/Downloads>). The NEWS file is also available at <https://github.com/twisted/twisted/blob/twisted-16.1.0/NEWS>. Many thanks to everyone who had a part in this release - the supporters of the Twisted Software Foundation, the developers who contributed code as well as documentation, and all the people building great things with Twisted! Twisted Regards, Amber Brown (HawkOwl)

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