Mailman 3 October 2015 - Twisted

[Twisted-Python] Buildbot downtime
by Tom Prince 04 Mar '22

04 Mar '22

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 06 Aug '21

06 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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[Twisted-Python] How to design REST API with Twisted?
by Wang Yan 13 Nov '15

13 Nov '15

Hi, I'm confused about how to design REST APIs with Twisted, especially when my app have to interact with MySQL. Is there any basic design patterns for this kind of situation? Thanks!

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[Twisted-Python] Possible bug
by Chris Norman 02 Nov '15

02 Nov '15

Hi all, Using windows 10 with Python 3.5, importing pretty much anything gives me the following error. Not sure if there's something wrong with my configuration or if it's a bug... I seem to remember something a while back, should I file a ticket? Traceback (most recent call last): File "<string>", line 1, in <module> File "C:\python35\lib\site-packages\twisted\internet\reactor.py", line 38, in <module> from twisted.internet import default File "C:\python35\lib\site-packages\twisted\internet\default.py", line 56, in <module> install = _getInstallFunction(platform) File "C:\python35\lib\site-packages\twisted\internet\default.py", line 50, in _getInstallFunction from twisted.internet.selectreactor import install File "C:\python35\lib\site-packages\twisted\internet\selectreactor.py", line 18, in <module> from twisted.internet import posixbase File "C:\python35\lib\site-packages\twisted\internet\posixbase.py", line 18, in <module> from twisted.internet import error, udp, tcp File "C:\python35\lib\site-packages\twisted\internet\udp.py", line 53, in <module> from twisted.internet import base, defer, address File "C:\python35\lib\site-packages\twisted\internet\base.py", line 23, in <module> from twisted.internet import fdesc, main, error, abstract, defer, threads File "C:\python35\lib\site-packages\twisted\internet\defer.py", line 29, in <module> from twisted.python import lockfile, failure File "C:\python35\lib\site-packages\twisted\python\lockfile.py", line 52, in <module> _open = file NameError: name 'file' is not defined Cheers,

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[Twisted-Python] log config depending on nodaemon option
by Markus Wanner 29 Oct '15

29 Oct '15

Hi, I'm trying to configure logging of my application depending on whether or not the -y (--nodaemon) option of twistd is given. Actually very similar to the default behavior, I would just like to switch to daily log files. But it seems the application created has no access to the config (used by underlying twistd and the ApplicationRunner). What's the best way to switch to daily log files using twistd? Kind Regards Markus Wanner

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[Twisted-Python] AMP with a long-lived connection - results and deferred?
by Oon-Ee Ng 29 Oct '15

29 Oct '15

Working off the example ampserver.py and ampclient.py examples, I wanted to build a client which maintains a single connection while allowing the passing of messages back and forth. However I'm stuck at one of the most basic steps, getting back the result (without 'completing' the connection). The ampclient.py example simply connects, does a callRemote on the resulting protocol, and adds callbacks to extract the result from a dictionary and print it. The deferred being used in this case is produced by connectProtocol. I'm trying to write a client (inheriting from amp.AMP) which is embedded in a kivy GUI, something which is quite possible using the _threadedselect reactor. On connection, I use the connectionMade method to save the 'self' (in this case, the client inheriting from amp.AMP) in my kivy app. I can then call a function which does a callRemote on this saved client, which indeed triggers the server appropriately. The callRemote returns a deferred (from reading docs online, a remote reference). I can't figure out what to do with it, specifically in terms of getting the result ('total', when calling Sum from ampserver.py). Assistance much appreciated.

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[Twisted-Python] Changing the Twisted Compatibility Policy
by Amber "Hawkie" Brown 27 Oct '15

27 Oct '15

Hi everyone, As many know, one of the things that makes the Twisted project so unique is our conformance to our Compatibility Policy. This policy means that users of Twisted can freely upgrade between versions with all incompatibilities being warned about before causing code to break. However, for a while, one part of the compatibility policy has caused issues - what we do with code that has been deprecated for a long time, and at least the release + 2 & 1 year after. The existing policy states: "Removal should happen once the deprecated API becomes an additional maintenance burden. For example, if it makes implementation of a new feature more difficult, if it makes documentation of non-deprecated APIs more confusing, or if its unit tests become an undue burden on the continuous integration system. Removal should not be undertaken just to follow a timeline." This makes the only reasonable cause for any code being removed from Twisted is if it is a maintenance burden, but does not take into account the effect that keeping large amounts of deprecated code has on new, existing, and future Twisted users. It does specify that it should be removed if it makes documentation of non-deprecated APIs confusing, but by its very existence, it makes what should be "best practice" more confusing -- especially if the deprecated API is "simpler" at first glance, but was deprecated because of vast underlying issues, Discussions have come to the conclusion that the exact reverse of this policy should be instated: "Removal of code should occur as soon as the deprecation grace period has ended." The reason for this is that a leaner Twisted is a better Twisted -- we should strive to not break existing applications, but we have the deprecation policy in place to ensure that breakage is, if all goes to plan, never out of the blue. Less code surface means that Twisted is easier to learn for new users and Twisted-using projects onboarding new people, easier to use for established users with a clear best practice, and easier to maintain because the codebase is not a web of things we deprecated and then never removed. We believe this change benefits everyone. This is also similar to the deprecation policy of another time-based releasing project, Django (https://docs.djangoproject.com/en/1.8/internals/release-process/#internal-r…), where releases are every 9 months and code is *always* removed in Release where deprecated + 2, giving them a deprecation grace period of up to 1 and a half years. If you have any opinions on this change, please let me know, and we'll take it all into account before changing the policy. Twisted Regards, Amber "Hawkie" Brown Twisted Release Manager

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[Twisted-Python] SNI callback with support for deferreds
by Jonathan Stoppani 27 Oct '15

27 Oct '15

Hello, A couple of days ago I asked on Stack Overflow about returning a deferred from an SNI callback and have pyOpenSSL wait for it to fire before continuing handling the request. Thanks to some pointers by Gyph I've found a solution ("workaround") for my problem, involving a fake TLSMemoryBIOProtocol to handle the client hello until the SNI is received, firing the SNI callback, waiting for it to callback and then re-feeding the resulting context to the real TLSMemoryBIOProtocol. The implementation of this solution is available at https://gist.github.com/GaretJax/124c523a62ba48c9eec1, and I'd like to contribute it back to Twisted, however, it has no unit tests and needs some design decisions/validation. I've opened a ticket to track it at https://twistedmatrix.com/trac/ticket/8065. Real-life impediments permitting, I'm willing to work on it and get the feature supported in Twisted core. Anyone willing to help me getting a proper patch? Best, Jonathan P.S.: A big shout-out to Twisted for its excellent TLS support out of the box. We got a straight A rating out of the box on ssl labs!

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[Twisted-Python] revisiting onboarding
by Glyph Lefkowitz 27 Oct '15

27 Oct '15

A few months ago, the question of an official process for obtaining commit access was raised. The discussion lead to this proposal - https://twistedmatrix.com/trac/wiki/Proposal/ContributorAdvancementPath <https://twistedmatrix.com/trac/wiki/Proposal/ContributorAdvancementPath>. I like that proposal, but it is still incomplete: to wit, it defines a template for how roles might be defined but does not actually define any roles. It also seems to be a bit overly ambitious, just from the observed reaction of nobody having the time to implement it :). So I have a proposal for a scaled back process that nevertheless would give us something official-ish: Not all committers are actively involved in the project at all times, so we should form a "committer committee" of people who are interested in evaluating candidates. If you would like to do that and you're already a committer, please contact me and I'll add you to the list. I want to do this so there's somewhere to apply to which isn't just a public mailing list or discussion, since public discussions can create social pressure to grant someone commit just to be nice, and rejections might be perceived as mean. Candidates should submit an application to this new list, commit(a)twistedmatrix.com <mailto:commit@twistedmatrix.com> which is a list of links to at least 10 tickets, at least 5 of which are patches they've submitted, and at least 5 of which are code reviews they've done which have been accepted by a committer. At least 2 of their authored patches should have gone all the way through the process to be landed. As with the other parts of our process, if there is at least one sponsor, and no objections from anyone on the committee within 7 days, any member of the committee may add the committer. New committers should then be announced on the mailing list. This is not really an ideal process - particularly, it lacks a good way to give contributors something specific and useful to do - but it's something at least. If there is general assent that this is an improvement, I'll go make a wiki page and a mailing list. -glyph

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