Mailman 3 August 2018 - Twisted

[Twisted-Python] Buildbot downtime
by Tom Prince 03 Mar '22

03 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 05 Aug '21

05 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] Keeping logger from snatching stdout?
by Jeff Grimmett 15 Sep '18

15 Sep '18

I'm working on a Flask project using the flask_twisted package from PyPI and have encountered a mystery. I don't *have* to solve it to move on, but darn it, I can't let it go :) https://pypi.org/project/Flask-Twisted/ https://github.com/cravler/flask-twisted/ So here's the breakdown: when use the standard logging module to output to a logfile + stdout, everything is fine. I do see some logging output from Twisted as well (the web server part) but for the most part life is groovy. I'm going to be integrating in a wxPython windows app to this (previously it's been a shell app) and step 1 was to make my own stdout handler that eventually would pipe all that stuff to a window in the wx app. The first step of THAT (step 1.a) was to replace all the logging stuff with print() placeholders. At that point, things got confusing, as now ALL of my print()s are being handled by Twisted's logging handler. I brought flask-twisted in local to my code so I could monkey around with it. First thing I noticed was that it was using twisted.python.log. I messed around with that - commented it out, and now I get no stdout output at all. Set the parameter setStdout to False, same thing. The adapter code uses twisted.internet.reactor, threads, twisted.web.server.Site, twisted.web.wsgi.WSGIResource, and twisted.web.resource.Resource, any one which might be responsible. I spent yesterday evening digging around but haven't found anything yet. Any guidance / ideas? Regards, Jeff

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[Twisted-Python] Issue with TLS failure modes
by Robert DiFalco 05 Sep '18

05 Sep '18

I'm having an issue properly handling TLS failure modes. For example consider the EchoServer and EchoClient code. If I use a TLS client with a TCP4 server, I do not get a handshake exception until I abort the connection. But I don't want to abort the connection unless I get a handshake error. What I'd like to do is to check the handshake status in my protocol before my client sends bytes to the server. I'd like my send message to be able to raise the <class 'OpenSSL.SSL.Error'>: [('SSL routines', 'ssl23_read', 'ssl handshake failure'). But for some reason it seems to get lost until I abort the connection. Does this sound familiar to anyone? What I've done for now is setup a Timeout mixin so that after my client.send, if I do not get an ACK back (which my particular protocol does) within two minutes, I just abort the connection. This then calls connectionLost with the correct SSL.Error. But if it's in the error queue (and found during the course of abortConnection then isn't there a way to find it sooner? Like before my timeout and before I call send on the client protocol? Thanks!

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[Twisted-Python] T9217 / PR1052: Wheels, wheels, and more wheels
by Kyle Altendorf 05 Sep '18

05 Sep '18

Hi All, I am working on ticket #9217 / PR #1051 to add lots more wheel generation to the Twisted CI. I decided to give the cibuildwheel package a try and it made this process almost too easy (well... sort of :] ). I've got AppVeyor-Windows, Travis-Linux, and Circle-OSX all building a variety of wheels for the supported Python versions and bit depths. Travis doesn't save artifacts 'easily' so I went ahead and doubled up on Linux on Circle for now, though it's having some Docker issues at the moment and hasn't been successful yet. For some reason in this one case the project directory isn't getting mounted into the container as expected. wheel links: https://github.com/twisted/twisted/pull/1051#issuecomment-416743261 (and next comment) Now that I've got the wheel builds happening I figured it'd be good to try them out on 'real' machines. Turns out we get a failure on twisted.cred.test.test_strcred.SSHCheckerTests.test_isChecker for at least the two checks I've done so far (Windows and OSX). I haven't done more than a cursory look at that yet, but it's on the list to understand and resolve. More testing would of course be welcome. Real world, just trial Twisted's own tests, whatever would be appreciated if you are interested. failures with wheels: https://github.com/twisted/twisted/pull/1051#issuecomment-416977723 Overall, it's a bit unclear what the intended use of the various CI hosts are for Twisted. I hear that Travis OSX builds were really slow, but from what I can see Circle isn't doing any OSX (other than what I added). There wasn't any artifact storage being used on Circle either. So, I'm not sure if there was a reason to use Circle that went away, or... But, not having to hook Travis up to S3 or somesuch for storage is quite nice so Circle wins at least in that category. Now that I've got something rough in place, are there any opinions about how this should work? I don't know the present release workflow so I don't know if we'd want an automatic push to PyPI on tags (probably not), or just artifacts on the build server to grab manually (would need some S3 or such for Travis, or Circle for Linux builds as well). Anything else? Do we want automated tests against the wheels? cibuildwheel does have a feature for that though I haven't done anything with it yet. Anyways... hello, thanks for Twisted, and I hope this work ends up saving some people some time. Cheers, -kyle

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[Twisted-Python] Using twistd with -c option causes permission error
by Richard Shea 31 Aug '18

31 Aug '18

I'm trying to use the -c option of twistd like this : twistd web --wsgi bar.app -c foo.cer -k privkey.pem --https=4433 I'm pointing it at a cert with perms like this "-rw-r--r-- 1 root root" but twistd complains about a permission error . I'm puzzled ... surely twistd only needs to read that file ? Thanks .

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[Twisted-Python] Can transport.write() to hostname instead of IP address?
by Sean DiZazzo 31 Aug '18

31 Aug '18

Hi all! After I start a reactor connecting to a specific hostname and port, I do my thing and then call transport.write() to send the data to the peer. >From what I can tell, though, the hostname is resolved, and the data is written back to the ip address itself, instead of the hostname I started the reactor with. This is a problem in my case because we are using nginx's ssl_preread server_name directive to route several different streams all coming in on the same ip address. So the write() method needs to explicitly use the hostname to route the packet properly. So... Is there any way to have transport.write() use the hostname given instead of it's resolved IP address? Or am I missing something? Crossposted on StackOverflow: https://stackoverflow.com/questions/51886720/is-there-a-way-to-force-twiste… Thank you for any insight you may have! ~Sean

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[Twisted-Python] Forking after starting AsyncioSelectorReactor: Supported?
by David Foster 28 Aug '18

28 Aug '18

Hi Twisted list! I have a library that is attempting to start an AsyncioSelectorReactor, fork the process, and then open a network socket on macOS. When the network socket is opened, Twisted throws an [Errno 9] "Bad file descriptor" exception at me. I get no such exception on Ubuntu. If I change the sequence from: setup_reactor('AsyncioSelectorReactor') fork_and_continue_in_child() run_server() to: fork_and_continue_in_child() # fork first setup_reactor('AsyncioSelectorReactor') run_server() Then everything works okay. Also if I use SelectReactor rather than AsyncioSelectorReactor then it doesn't matter which order I fork in. So my question is, does Twisted support being forked after starting a reactor or not? -- David Foster | Seattle, WA, USA P.S. For more details see this Django Channels thread: https://github.com/django/channels/issues/962#issuecomment-414103367

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[Twisted-Python] Weekly Bug Summary
by trac＠twistedmatrix.com 26 Aug '18

26 Aug '18

1 0