Mailman 3 March 2016 - Twisted

[Twisted-Python] Is ticket #7934 still relevant?
by Eeshan Garg 16 Mar '16

16 Mar '16

Hello, everyone! I was just wondering, is <https://twistedmatrix.com/trac/ticket/7934> still relevant? If so, I would love to pick up where I left off. :-) Also, any other starter projects or easy tickets that I could maybe work on to contribute more and learn more? Thanks & regards, Eeshan Garg

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[Twisted-Python] Twisted 16.0 Released
by Amber "Hawkie" Brown 16 Mar '16

16 Mar '16

On behalf of Twisted Matrix Laboratories, I am honoured to announce the release of Twisted 16.0! Twisted 16.0 brings some important changes, and some nice-to-haves as well. The major things are: - TLS endpoints have arrived! They're like the old `ssl:` endpoints, but support faster IPv4/IPv6 connections (using HostnameEndpoint) and always do hostname verification. - Conch now uses Cryptography instead of PyCrypto for underlying cryptographic operations. This means it'll work much better on PyPy! - Headers objects (notably used by t.web.server.Request) now support Unicode for the vast majority of cases, encoding keys to ISO-8859-1 and values to UTF-8. - WSGI support and AMP have been ported to Python 3, along with a handful of other modules. - More shedding of the past, with the GTK+ 1 reactor being removed. - Over 45 tickets have been closed since 15.5. 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-16.0.0/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) Twisted Release Manager

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Re: [Twisted-Python] Twisted serialport
by Chris West 10 Mar '16

10 Mar '16

Adi, Thanks for the reply, I've applied the patch and that has sorted out my problem. Many thanks, Chris Date: Wed, 9 Mar 2016 09:59:21 +0000 From: Adi Roiban <adi(a)roiban.ro> To: Twisted general discussion <twisted-python(a)twistedmatrix.com> Subject: Re: [Twisted-Python] Twisted serialport Message-ID: <CAFycZ9eOtEG6uUn=+5zP78wSLSiroHbP-iqDvxijLA_R4YAi_w(a)mail.gmail.com> Content-Type: text/plain; charset="utf-8" On 9 March 2016 at 09:53, Chris West <cwest(a)senceive.com> wrote: > I?m currently using the SerialPort connection type in twisted 15.5.0 > with python 2.7.7 on a windows machine. > > > > Twisted serial communications with the serial port fail when pyserial > is upgraded from 2.7 to 3.0.1 and fails with the following error. > > > Hi, I think that this is a know issue. Please see https://twistedmatrix.com/trac/ticket/8159 It would help if you could try the patch and report that all is ok for your use case. If not the same issue, please report a new ticket. Regards -- Adi Roiban

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[Twisted-Python] Can't identify protocol
by Matilda Bernard 09 Mar '16

09 Mar '16

Hi, I am using Twisted 15.2.1 have been seeing a lot of half open TCP/IP connections (lsof can't identify protocol) when I get a lot of traffic . Is this something you have seen with twisted? I'm not really dealing with socket connections at my code level so thought I'd ask if there is a known issue as I am trying to figure out where the connections are being left half open. Thanks Matilda

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[Twisted-Python] Build and installation problem
by Angelo Conte 09 Mar '16

09 Mar '16

I'm new here and I want to report that I'm having troubles installing Twisted on an embedded linux machine <https://github.com/victronenergy/venus>. uname -a reports: Linux ccgx 3.7.1 #1 Tue Dec 1 14:59:18 CET 2015 armv7l GNU/Linux I've tried to install both with pip and with setup.py (with a root user). There is no opkg package for Twisted, All dependencies should be ok. Here is what I get with setup.py build and install root@ccgx:~/Twisted-15.5.0# python setup.py build running build running build_py running egg_info writing requirements to Twisted.egg-info/requires.txt writing Twisted.egg-info/PKG-INFO writing top-level names to Twisted.egg-info/top_level.txt writing dependency_links to Twisted.egg-info/dependency_links.txt reading manifest file 'Twisted.egg-info/SOURCES.txt' writing manifest file 'Twisted.egg-info/SOURCES.txt' running build_ext arm-ve-linux-gnueabi-gcc -march=armv7-a -mthumb-interwork -mfloat-abi=softfp -mfpu=neon -D__SOFTFP__ .30/build/tmp-eglibc/sysroots/bpp3 -fno-strict-aliasing -O2 -pipe -g -feliminate-unused-debug-types -DNDEBUG -g -O3 -Wall -Wstrict-prototypes -fPIC -I/usr/include/python2.7 -c conftest.c -o conftest.o arm-ve-linux-gnueabi-gcc: error: .30/build/tmp-eglibc/sysroots/bpp3: No such file or directory building 'twisted.test.raiser' extension arm-ve-linux-gnueabi-gcc -march=armv7-a -mthumb-interwork -mfloat-abi=softfp -mfpu=neon -D__SOFTFP__ .30/build/tmp-eglibc/sysroots/bpp3 -fno-strict-aliasing -O2 -pipe -g -feliminate-unused-debug-types -DNDEBUG -g -O3 -Wall -Wstrict-prototypes -fPIC -I/usr/include/python2.7 -c twisted/test/raiser.c -o build/temp.linux-armv7l-2.7/twisted/test/raiser.o arm-ve-linux-gnueabi-gcc: error: .30/build/tmp-eglibc/sysroots/bpp3: No such file or directory error: command 'arm-ve-linux-gnueabi-gcc' failed with exit status 1 root@ccgx:~/Twisted-15.5.0# python setup.py install running install running bdist_egg running egg_info writing requirements to Twisted.egg-info/requires.txt writing Twisted.egg-info/PKG-INFO writing top-level names to Twisted.egg-info/top_level.txt writing dependency_links to Twisted.egg-info/dependency_links.txt reading manifest file 'Twisted.egg-info/SOURCES.txt' writing manifest file 'Twisted.egg-info/SOURCES.txt' installing library code to build/bdist.linux-armv7l/egg running install_lib running build_py running build_ext arm-ve-linux-gnueabi-gcc -march=armv7-a -mthumb-interwork -mfloat-abi=softfp -mfpu=neon -D__SOFTFP__ .30/build/tmp-eglibc/sysroots/bpp3 -fno-strict-aliasing -O2 -pipe -g -feliminate-unused-debug-types -DNDEBUG -g -O3 -Wall -Wstrict-prototypes -fPIC -I/usr/include/python2.7 -c conftest.c -o conftest.o arm-ve-linux-gnueabi-gcc: error: .30/build/tmp-eglibc/sysroots/bpp3: No such file or directory building 'twisted.test.raiser' extension arm-ve-linux-gnueabi-gcc -march=armv7-a -mthumb-interwork -mfloat-abi=softfp -mfpu=neon -D__SOFTFP__ .30/build/tmp-eglibc/sysroots/bpp3 -fno-strict-aliasing -O2 -pipe -g -feliminate-unused-debug-types -DNDEBUG -g -O3 -Wall -Wstrict-prototypes -fPIC -I/usr/include/python2.7 -c twisted/test/raiser.c -o build/temp.linux-armv7l-2.7/twisted/test/raiser.o arm-ve-linux-gnueabi-gcc: error: .30/build/tmp-eglibc/sysroots/bpp3: No such file or directory error: command 'arm-ve-linux-gnueabi-gcc' failed with exit status 1 I can't find any reference to the folder .30/build/tmp-eglibc/sysroots/bpp3 on my system. Do you have any clue? Thank you Angelo

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[Twisted-Python] Twisted serialport
by Chris West 09 Mar '16

09 Mar '16

I'm currently using the SerialPort connection type in twisted 15.5.0 with python 2.7.7 on a windows machine. Twisted serial communications with the serial port fail when pyserial is upgraded from 2.7 to 3.0.1 and fails with the following error. Traceback (most recent call last): File "C:\Anaconda\Scripts\fmv3dbg-script.py", line 9, in <module> load_entry_point('fmv3tools==0.2.5', 'console_scripts', 'fmv3dbg')() File "C:\Anaconda\lib\site-packages\fmv3tools-0.2.5-py2.7.egg\fmv3tools\fmv3dbg.py", line 338, in main server = create_system(args) File "C:\Anaconda\lib\site-packages\fmv3tools-0.2.5-py2.7.egg\fmv3tools\fmv3dbg.py", line 310, in create_system server = SerialServer(com_port, outputs=outputs) File "C:\Anaconda\lib\site-packages\fmv3tools-0.2.5-py2.7.egg\fmv3tools\fmv3dbg.py", line 57, in __init__ FMv3SerialGateway.__init__(self, com_port, *args, **kwargs) File "C:\Anaconda\lib\site-packages\flatmesh-0.2.8-py2.7.egg\flatmesh\fmv3_datacoms.py", line 403, in __init __ baudrate=baudrate) File "C:\Anaconda\lib\site-packages\twisted-15.5.0-py2.7-win32.egg\twisted\internet\_win32serialport.py", line 56, in __init__ self._finishPortSetup() File "C:\Anaconda\lib\site-packages\twisted-15.5.0-py2.7-win32.egg\twisted\internet\_win32serialport.py", line 65, in _finishPortSetup flags, comstat = win32file.ClearCommError(self._serial.hComPort) AttributeError: 'Serial' object has no attribute 'hComPort' I've removed pyserial 3.0.1 from my system for the moment but I was wondering if there is a way to have both pyserial 2.7 and 3.0.1 on my system when using twisted? Thanks, Chris

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[Twisted-Python] password reset not working?
by Donal McMullan 07 Mar '16

07 Mar '16

I just reset my password at https://twistedmatrix.com/trac/reset_password a couple of times. In both cases the new password that was sent to me is rejected when I try to log in. Is this supposed to work? I only found the path to the reset_password form by searching the Trac docs. I'm not sure it's linked to from anywhere on twistedmatrix.com Thanks DJM

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Re: [Twisted-Python] how to implement login form logic with twisted.cred checkers, credentials and portal
by Mashiat Sarker Shakkhar 06 Mar '16

06 Mar '16

On 3/2/16 9:32 AM, snailcoder wrote: > I'm trying to implement some login logic using twisted.cred module for > a website. In short, there's a login page with username/password > forms. Once the user input the right username/password, the browser > will redirect to another page which includes the user's profile. > > Does anyone have any ideas about how to implement this logic with > twisted.cred checkers, credentials and portal? Any suggestion is > appreciated :-) Hi Before I answer your question, allow me to give you a word of advice. Twisted is a low-level library. While you can build a web application directly on top of Twisted, I would not recommend it. You need higher-level abstractions to write manageable code. I recommend that you find a framework that builds on top of Twisted. As for your question, you will find many examples of Twisted authentication if you Google a bit. You should probably start by reading this page: https://twistedmatrix.com/documents/current/core/howto/cred.html. Below you will find a simple (and not very secure) example. It uses HTTP Basic authentication. It owes its verbosity to the low-level nature of Twisted. from twisted.cred import portal, checkers, credentials, error as credError from twisted.internet import defer, reactor from twisted.web import guard, http, resource, server from zope.interface import implements class HttpPasswordRealm(object): implements(portal.IRealm) def __init__(self, resource): self.resource = resource def requestAvatar(self, avatarId, mind, *interfaces): if resource.IResource in interfaces: return (resource.IResource, self.resource, lambda: None) raise NotImplementedError() class MyPasswordChecker(object): implements(checkers.ICredentialsChecker) credentialInterfaces = (credentials.IUsernamePassword, ) MY_INSECURE_CREDS = {'name': 'pa$$w0rd'} @defer.inlineCallbacks def requestAvatarId(self, creds): pw = self.MY_INSECURE_CREDS.get(creds.username) or b'' pw_match = yield creds.checkPassword(pw) if pw_match is True: defer.returnValue(creds.username) else: raise credError.UnauthorizedLogin('Incorrect username or password') class MyPortal(resource.Resource): isLeaf = True def render_GET(self, request): return 'Top secret content' checker = MyPasswordChecker() realm = HttpPasswordRealm(MyPortal()) p = portal.Portal(realm, [checker, ]) factory = guard.BasicCredentialFactory('My secret portal') protected_resource = guard.HTTPAuthSessionWrapper(p, [factory, ]) site = server.Site(protected_resource) site.protocol = http.HTTPChannel reactor.listenTCP(8080, site) reactor.run() Do not go and copy-paste the above. Please do your research. To build the interaction you described, I will recommend using Klein (https://github.com/twisted/klein). Klein can give you your entire app as a Resource instance. This example does not manage sessions or lets you log out. It only describes how you can protect a Resource using Twisted.cred. Good luck. Regards Shakkhar

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[Twisted-Python] Twisted 16.0.0 Prerelease 3 Announcement
by Amber "Hawkie" Brown 03 Mar '16

03 Mar '16

Hi everyone, exarkun spotted a regression in the 16.0.0 prereleases, where calling endpoints' serverWithString with a SSL strports description and an empty chain file would give an unhelpful error message. These issues have been fixed and are in Twisted 16.0.0pre3. You can find it and the NEWS file at https://twistedmatrix.com/Releases/pre/16.0.0pre3/ . If no further issues are identified, Twisted 16.0 will be released this week (for real!). - Amber Brown Twisted Release Manager

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