Mailman 3 December 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] "twistd" in Twisted 16.4.0 can't import modules/packages from current working directory
by Yuri Feb. 14, 2017

Feb. 14, 2017

Hi all I couldn't find Twisted-specific group, so posting here. Recently Twisted 16.4.0 got released. Yesterday I've tried to upgrade it for my apps and got an error. I've created simple example, which demonstrates it. File service.tac: ======================================= import os from twisted.application import service, internet import mymodule application = service.Application("Demo application") ---------------------------------------- File mymodule.py: ======================================== def myfunction(asd): """ Stub function """ ---------------------------------------- If you try to run it with twistd -y service.tac you'll get an error: == output ============================== Unhandled Error Traceback (most recent call last): File "/usr/local/lib/python2.7/site-packages/twisted/application/app.py", line 648, in run runApp(config) File "/usr/local/lib/python2.7/site-packages/twisted/scripts/twistd.py", line 25, in runApp _SomeApplicationRunner(config).run() File "/usr/local/lib/python2.7/site-packages/twisted/application/app.py", line 379, in run self.application = self.createOrGetApplication() File "/usr/local/lib/python2.7/site-packages/twisted/application/app.py", line 444, in createOrGetApplication application = getApplication(self.config, passphrase) --- <exception caught here> --- File "/usr/local/lib/python2.7/site-packages/twisted/application/app.py", line 455, in getApplication application = service.loadApplication(filename, style, passphrase) File "/usr/local/lib/python2.7/site-packages/twisted/application/service.py", line 411, in loadApplication passphrase) File "/usr/local/lib/python2.7/site-packages/twisted/persisted/sob.py", line 223, in loadValueFromFile eval(codeObj, d, d) File "service.tac", line 7, in <module> import mymodule exceptions.ImportError: No module named mymodule Failed to load application: No module named mymodule ---------------------------------------- The errors comes down to this: twistd script does not add current working directory to python path (or removes it, I don't know what exactly happens), so it fails to import any packages/modules from it. The issue does not appear in previous version (Twisted 16.3.2). Any ideas what caused it?

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[Twisted-Python] conch problem with ecdsa-sha2-nistp256 host key?
by Craig Rodrigues Jan. 21, 2017

Jan. 21, 2017

Hi, I filed this bug: https://twistedmatrix.com/trac/ticket/8931 At least for me, conch fails to parse a host key created by OpenSSH in ~/.ssh/known_hosts which is of type ecdsa-sha2-nistp256. Anyone have an idea as to how to fix this? -- Craig

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[Twisted-Python] Twisted 16.7.0rc1 Release Candidate Announcement
by Amber "Hawkie" Brown Jan. 3, 2017

Jan. 3, 2017

Hello everyone, and happy holidays! Although it didn't quite fall on the solstice, one could call this Twisted release a little ray of sunshine, with some nice new improvements. 16.7.0rc1 brings the following stocking stuffers: - twisted.web.client.Agent now supports IPv6! It's also now the primary web client in Twisted, with twisted.web.client.getPage being deprecated in favour of it and Treq. - twisted.internet.ssl.CertificateOptions has had its `method` argument deprecated, in favour of the new raiseMinimumTo, lowerMaximumSecurityTo, and insecurelyLowerMinimumTo arguments, which take TLSVersion arguments. This allows you to better give a range of versions of TLS you wish to negotiate, rather than forcing yourself to any one version. - twisted.internet.ssl.CertificateOptions will use OpenSSL's MODE_RELEASE_BUFFERS, which will let it free unused memory that was held by idle TLS connections. - You can now call the new twist runner with `python -m twisted`. - Conch has the beginnings of ECDH key exchange, and supports `hmac-sha2-384` in twisted.conch.ssh. - Better Unicode support in twisted.internet.reactor.spawnProcess, especially on Windows on Python 3.6. - More Python 3 porting in Conch, and more under-the-hood changes to facilitate a Twisted-wide jump to new-style classes only on Python 2 in 2018/2019. This release has also been tested on Python 3.6 on Linux. - Lots of deprecated code removals, to make a sleeker, less confusing Twisted. - 20+ closed tickets. You can get the tarball and the NEWS file at https://twistedmatrix.com/Releases/rc/16.7.0rc1/ <https://twistedmatrix.com/Releases/rc/16.7.0rc1/> , or you can try it out from PyPI: python -m pip install Twisted==16.7.0rc1 Please test it, and let me know how your applications fare, good or bad! If nothing comes up, 16.7 looks like it'll land just before the new year. With festive hoots, Amber Brown

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[Twisted-Python] AWS Auth v4 for Twisted?
by Jean-Paul Calderone Jan. 2, 2017

Jan. 2, 2017

Seeking a library that implements this for use with txAWS. More details: https://stackoverflow.com/questions/41322251/is-there-an-aws-auth-v4-implem… Jean-Paul

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[Twisted-Python] twisted.python.sendmsg segfault - looking for confirmation
by ex vito Dec. 30, 2016

Dec. 30, 2016

Dear all, While working on http://twistedmatrix.com/trac/ticket/8912 and the associated PR at https://github.com/twisted/twisted/pull/647 I hit a segmentation fault on a test I was preparing. I think narrowed it down Linux + Python 2, but I'm not 100% sure. Can anyone please confirm the code below segfaults on such environment? For completeness, from my tests, it works fine on Linux + Python 3, and fails with socket.error/OSError on Mac OS 10.9.5 + Python 2/3. No BSDs at hand to try out... As far as I can tell, no code in Twisted uses sendmsg in the way the code is using it. However, twisted.python.sendmsg is a public API so someone somewhere may hit this like I just did. Other than looking for confirmation, I have a fix which I included two isolated commits in the PR. Twisted project members: if this is confirmed, maybe a ticket should be created in Trac and an independent PR created, correct? Thanks in advance for any input. Regards, -- exvito -[ cut here ]---------------------------------------------------------------------- import os import socket import struct import sys from twisted.python import sendmsg if __name__ == '__main__': # This code segfaults when running with twisted/trunk commit # 98a3df200968b78bd3b985dfd4fb10a5b415d6fc on Linux Python 2 # due to a bug in src/twisted/python/_sendmsg.c and glibc's # CMSG_NXTHDR implementation. # get connected sockets s1, s2 = socket.socketpair(socket.AF_UNIX) # two CMSGs in ancillary data (no segfault with just one) ancillary = [ (socket.SOL_SOCKET, sendmsg.SCM_RIGHTS, struct.pack('i', s1.fileno())), (socket.SOL_SOCKET, sendmsg.SCM_RIGHTS, struct.pack('i', s2.fileno())), ] expected = { 2: 'Expecting to segfault.', 3: 'Should not segfault.', } print expected.get(sys.version_info.major, 'Unexpected Python version.') retval = sendmsg.sendmsg(s1, data=b'some data', ancillary=ancillary) print 'Did not segfault.' -[ cut here ]----------------------------------------------------------------------

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Re: [Twisted-Python] hmac-sha2-512 - Corrupted MAC on input with OpenSSH
by 陈健 Dec. 29, 2016

Dec. 29, 2016

hi, Yes, you are right. ssh -vv -oKexAlgorithms=diffie-hellman-group14-sha1 -oMACs=hmac-sha2-512 user@localhost against a Twisted ssh server, and i saw the problem. The reason is that twisted(16.6.0) is not supported the diffie-hellman-group14-sha1 and ecdh-sha512-nistp512 key exchange algorithms well, right ? -- JianChen At 2016-12-29 16:06:55, "Craig Rodrigues" <rodrigc(a)crodrigues.org> wrote: Abhishek Choudhary pointed out to me that you can reproduce this problem easily, even with OpenSSH client. Look at https://twistedmatrix.com/trac/ticket/8258 and do: ssh -vv -oKexAlgorithms=diffie-hellman-group14-sha1 -oMACs=hmac-sha2-512 user@localhost against a Twisted ssh server, and you will see the problem. -- Craig On Thu, Dec 29, 2016 at 1:17 AM, 陈健 <chenjianhappy2008(a)126.com> wrote: hi, Yes, your understanding is correct. I must set the hmac-sha2-512 option unable with SecureCRT, it will be OK. I searched Google for a long time, still did not find the any clues! Twisted Server + OpenSSH client == WORKS Twisted Server + Xshell client == WORKS OpenSSH Server + SecureCRT client == WORKS Twisted Server + SecureCRT client == FAIL -- JianChen 在 2016-12-29 12:35:57，"Craig Rodrigues" <rodrigc(a)crodrigues.org> 写道： Hi, Is this what you are saying: Twisted Server + OpenSSH client == WORKS Twisted Server + Xshell client == WORKS OpenSSH Server + SecureCRT client == WORKS Twisted Server + SecureCRT client == FAIL ?? I don't have SecureCRT client, so don't know the solution to this problem. You might want to try searching the SecureCRT site and see if there are any clues there: https://goo.gl/UkKZvI -- Craig On Wed, Dec 28, 2016 at 9:39 PM, 陈健 <chenjianhappy2008(a)126.com> wrote: hi: Oh, I'm sorry, It is my server-side code has bugs with Twisted(16.6.0) Conch, that i have fixed it . But 'Message Authentication Code did not verify (packet #3)' error will occurs with the SecureCRT(8.0.0 or 7.3.4) client. If I connect OpenSSH_5.3p1 (or OpenSSH_6.6.1p1 ) sshd server through the SecureCRT client, it is fine. Of course， if I connect Twisted SSH server by using the Xshell client with hmac-sha2-512 options or “ssh -m hmac-sha2-512”，it is OK. I do not know if it is SecureCRT client bug or twisted problem. http://stackoverflow.com/questions/41296412/securecrt-hmac-sha2-512-message…

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[Twisted-Python] hmac-sha2-512 - Corrupted MAC on input with OpenSSH
by 陈健 Dec. 28, 2016

Dec. 28, 2016

hi: | | I write a SSH server with Twisted(15.5.0) Conch. But it don't support hmac-sha2-512 MAC algorithms | . However I see this problem has been fixed in https://twistedmatrix.com/trac/ticket/8108 . I asked the question in http://stackoverflow.com/questions/41254398/twisted-hmac-sha2-512-corrupted… . Best regards, ---jianchen

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[Twisted-Python] New Supported Platforms - FreeBSD (2.7 & 3.5), Python 3.6 (Linux)
by Amber Hawkie Brown Dec. 25, 2016

Dec. 25, 2016

Hi everyone, I just migrated a few buildbots over to the 'supported' column. This includes Python 3.6 on Ubuntu 16.04 (compiled, not an official distro binary :) ) and FreeBSD 10.1 (Python 2.7 & 3.5). Twisted 16.7 passes on both of these, so you can consider them supported platforms for it. - Amber

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[Twisted-Python] Weekly Bug Summary
by trac＠twistedmatrix.com Dec. 24, 2016

Dec. 24, 2016

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[Twisted-Python] twistd and loglevel question
by Jonathan Vanasco Dec. 22, 2016

Dec. 22, 2016

i couldn't find anything in docs/source, but just want to double-check... am i correct that there is nothing in `twistd` that will automatically set the (normal) python logging level based on args/env vars?

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[Twisted-Python] ITransport.write after IProtocol.connectionLost -- no failure/exception?
by exvito here Dec. 19, 2016

Dec. 19, 2016

Dear all, The subject says most of it. While diagnosing a behavior on a somewhat large codebase, I found out something somewhat surprising -- see subject -- which is replicated with the minimal code example below. It is a LineReceiver client that: 1. Connects to 127.0.0.1:10000. 2. Sends a line of text. 3. Disconnects one second later. 4. Tries to send another line of text, one second after disconnection. I expected step 4 to fail somehow, given that Twisted promptly detected that the connection closed and IProtocol.connectionLost was called, as documented. Nevertheless, it does not fail. So the questions are: a) Why does it not fail? I'm sure there is a good reason for that, as most things do in Twisted. b) Does a protocol implementation, like the one in the example, really need to track connectionMade / connectionLost calls before going for self.transport.write? c) Can a protocol implementation, instead, depend on self.transport.connected for which I found no documentation? (I probably missed it, where is it?) Thanks in advance for enlightening me. :-) Regards, -- exvito # --[ cut here ]---------------------------------------------------- from twisted.internet import protocol, reactor, defer from twisted.protocols import basic class ClientAPI(basic.LineReceiver): def _log(self, msg): print('[connected=%r] %s' % (self.transport.connected, msg)) def _send(self, line): self.sendLine(line) self._log('sent: %r' % (line,)) def connectionMade(self): self._log('connection made') self._send('first line') reactor.callLater(1, lambda: self.transport.loseConnection()) def connectionLost(self, reason): self._log('connection lost') reactor.callLater(1, self.postConnectionLostCall) def postConnectionLostCall(self): self._send('post conn lost call - SHOULD FAIL') class ClientFactory(protocol.ClientFactory): protocol = ClientAPI def clientConnectionFailed(self, connector, reason): print 'connection failed -', reason reactor.stop() if __name__ == '__main__': factory = ClientFactory() reactor.connectTCP('127.0.0.1', 10000, factory) reactor.run()

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[Twisted-Python] the right twisted base classes for my project
by elguavas Dec. 18, 2016

Dec. 18, 2016

hi all. i have a project with a networked aspect that i'm thinking of rewriting to use twisted. i'd like to ask for any input on the best twisted functions to base my rewrite on for my usage case, thanks. the project is a fairly simple "games room" that lets a small number of users (from 2 up to a handful, lets say 12 max) join to play simple 2d board games against each other. there is also a general chat among current players function. i originally wrote the networking code for this using python's stdlib asyncore and asynchat modules, implementing a basic rpc-like mechanism to allow clients and server to communicate via simple structured string "messages". i have to say if it was a only bit of a nightmare to code, it was a _lot_ of a nightmare to test and debug... anyway, so i'm rewriting the networking code and looking at twisted and i'd like to make sure i start off using the right parts of twisted for the job right from the beginning. the networking is based on having a server, that maintains central game state and coordinates it among the clients, and clients that connect to the sever to participate in games. the clients need to be able to call functions on the server. the server needs to be able to return data to the clients and also to call functions back on specific clients, or subsets of clients, or all clients. i've had a good look through the twisted docs and i'm thinking that perspective broker is what probably i need, likely along with its avatar functionality. is this a sensible way to go or am i overlooking something obvious? (oh, and a last questionlet would be: if that would be the right parts of twisted to use, what would that buy me above the other possibility i'm considering, which is rewiriting using python's new asyncio stuff?) tia for any replies, stephen.

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[Twisted-Python] Weekly Bug Summary
by trac＠twistedmatrix.com Dec. 17, 2016

Dec. 17, 2016

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[Twisted-Python] buildbot certificate expiration
by Glyph Lefkowitz Dec. 13, 2016

Dec. 13, 2016

Buildbot's HTTPS certificate is expired. This suggests that its txacme auto-renewal has come unglued and fallen off. I'll probably poke at it later today but I figured I'd just send a note first in case someone else happened to know what was up... -glyph

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[Twisted-Python] CI FYI
by Glyph Lefkowitz Dec. 12, 2016

Dec. 12, 2016

Hello Twisted maintainers, I realized today that not not everyone is aware of this quirk in our build infrastructure, and since it's a required step, y'all should probably know about it. Any PR that we merge should run not just on public CI (travis, appveyor, codecov) but also our own Buildbot infrastructure. Many of our supported platforms, particularly desktop Windows and OS X, do not have good support from multi-tenant CI vendors. This has always been true, but recently it became mechanically necessary because the OS X status from buildbot became a required status, which means that it appears in the "waiting" state even if no build has actually been started. No twisted PR will have a successful build unless some TM Labs member has done the following. Since our buildbots do not have adequate security to run totally untrusted code, only project members may submit builds to them. The way a project member submits such a build is they cause a ref to exist in the official Twisted repo's namespace. So, a necessary step in the code review process is to scan the diff to ensure that it's not malicious, and to then ensure that a branch exists in the https://github.com/twisted/twisted/ <https://github.com/twisted/twisted/> namespace pointing at the exact commit that you want buildbot builds to run tests for. (Don't worry: the buildbots are not fully secured, but neither do they contain particularly sensitive data. If you screw this check up, the main potentially bad consequence is to availability of the build fleet, not compromise of PyPI releases or anything like that. That said, if you screw up the security check in the full review and it lands on master, then some really bad stuff can happen...) The way to express this intent to Git is something like: $ git fetch origin "refs/pull/${PR_NUMBER}/head" $ git push origin FETCH_HEAD:"${TICKET_NUMBER}-branchname" I don't know of a way to do it through the github web UI but perhaps someone more knowledgeable could chime in. Thanks, -glyph

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[Twisted-Python] Weekly Bug Summary
by trac＠twistedmatrix.com Dec. 10, 2016

Dec. 10, 2016

1 0

[Twisted-Python] Spurious commit/ticket links
by Jean-Paul Calderone Dec. 9, 2016

Dec. 9, 2016

Hi, In the last couple days I've noticed that there are a bunch of spurious changes being made to tickets in the issue tracker. These come from commit messages that reference a GitHub PR that happens to match a ticket number in trac. For example, https://twistedmatrix.com/trac/ticket/600#comment:11 I guess this doesn't really hurt anything ... except it's dumping a constant low level of garbage into the issue tracker and generating some annoying emails (that end up having nothing to do with what the subject suggests). Jean-Paul

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[Twisted-Python] memory leaks
by Glyph Lefkowitz Dec. 6, 2016

Dec. 6, 2016

Following up on a Stack Overflow question from some time ago, http://stackoverflow.com/questions/40604545/twisted-using-connectprotocol-t… since the submitter added a minimal reproducer, I used Heappy https://pypi.org/project/guppy/ to look at memory sizing, and seeing large numbers of Logger instances and type objects leaking when using client endpoints. It was not immediately obvious to me where the leak is occurring though, as I was careful to clean up the Deferred results and not leave them in a failure state. I am hoping that I can entice someone else to diagnose this far enough to actually file a bug :-). -glyph

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Re: [Twisted-Python] trac deployment (was: memory leaks)
by Jean-Paul Calderone Dec. 6, 2016

Dec. 6, 2016

On Tue, Dec 6, 2016 at 1:58 AM, Glyph Lefkowitz <glyph(a)twistedmatrix.com> wrote: > > Thanks! > > By "Fixed" I take it you mean rolled back, via: > > trac@dornkirk:~$ ./virtualenv/bin/pip freeze | grep Trac== > Trac==1.0.13 > > > and > > https://github.com/twisted-infra/braid/commit/ > c2d393fd501c6464b1b475eff214cab64f13ee2a > > > Don't get me wrong, I'm not complaining :). This is certainly the right > thing to do for now. But I'm wondering if you know what's wrong with 1.2 > so we can upgrade soonish? > > Is the braid trac service also fixed - or does the next person who tries to update the deployment need to watch out for this same failure mode? Jean-Paul > -glyph > > > _______________________________________________ > Twisted-Python mailing list > Twisted-Python(a)twistedmatrix.com > http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python > >

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[Twisted-Python] Weekly Bug Summary
by trac＠twistedmatrix.com Dec. 3, 2016

Dec. 3, 2016

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[Twisted-Python] continuous integration update
by Glyph Lefkowitz Dec. 2, 2016

Dec. 2, 2016

Hi all, On Github, the process was supposed to be that we push any 3rd-party contributor branches to the buildbots before doing a final merge. However, we (myself included, I think) have been landing PRs without doing that first. In order to ensure that the process is followed, I've added a representative sample of buildbot status checks - specifically, buildbot/osx10.10-py2.7, buildbot/freebsd10-py3.5, and buildbot/freebsd10-py2.7 to the required list. Additionally, I think I'd like to take our Mac builds off of Travis. They're still in the allow_fail section, so they haven't been blocking merges, but a Travis build can't complete (and therefore register as "succeded") without them. Given the repeated OS X related incidents on Travis (see here https://www.traviscistatus.com/incidents/nq0sf0srvx8s and here https://www.traviscistatus.com/incidents/3d430hxd59ft here https://www.traviscistatus.com/incidents/06xg686x7wgw and here https://www.traviscistatus.com/incidents/w82t22dlpntr and here https://www.traviscistatus.com/incidents/j7ttlsnbkf33 if you haven't been personally affected) the OS X builds have been responsible for something like 90% of our build times and have prevented me from making a lot of progress this week. I've submitted a PR for this at https://github.com/twisted/twisted/pull/614 which hopefully someone can review and merge if they agree. Thanks, -glyph

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[Twisted-Python] future directions for Deferred
by Glyph Lefkowitz Dec. 1, 2016

Dec. 1, 2016

Since this is of potentially very broad interest within the Twisted maintainer team and development audience, those on the mailing list may want to read this github comment <https://github.com/twisted/twisted/pull/590#issuecomment-264070327> about ongoing discussions about future development of Deferred. -glyph

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