Mailman 3 May 2014 - 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. ______ __ __ _____ _ _ | ____ | \_/ |_____] |_____| |… [View More]

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May 1, 2019

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[Twisted-Python] Better usage of Twisted on multi core processor
by Sumanth Puram March 13, 2015

March 13, 2015

Hi all, I have a twisted TCP server to listens to client, processes requests, do mysql database operations if needed (using adbapi Connection pool) and return the result. Before deploying this in production, I want to know right way to configure the server. Since twisted is single threaded, how can I leverage multiple cores of my production machine (which has 6 cores and 16 GB RAM) ? One approach that I thought of was to start multiple instances of twisted server on different ports. This … [View More]

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[Twisted-Python] [ANN] txZMQ released
by Andrey Smirnov July 21, 2014

July 21, 2014

Hi! I would like to announce txZMQ, ZeroMQ bindings for Twisted. txZMQ is based on pyzmq and requires recent ØMQ version (>=2.1). txZMQ uses ØMQ APIs to get file descriptor that is used to signal pending actions from ØMQ library IO thread running in separate thread. txZMQ should be usable with any Twisted reactor. ØMQ is: * The socket library that acts as a concurrency framework. * Carries messages across inproc, IPC, TCP, and multicast. * Connect N-to-N via fanout, pubsub, pipeline,… [View More]

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[Twisted-Python] Status of trac upgrade
by exarkun＠twistedmatrix.com June 19, 2014

June 19, 2014

Hello, I was just wondering what the current status of the effort to upgrade trac on twistedmatrix.com is. Thanks, Jean-Paul

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[Twisted-Python] ANN: Crochet 1.3.0 - Use Twisted Anywhere!
by Itamar Turner-Trauring June 2, 2014

June 2, 2014

Crochet is an MIT-licensed library that makes it easier to use Twisted from regular blocking code. Some use cases include: * Easily use Twisted from a blocking framework like Django or Flask. * Write a library that provides a blocking API, but uses Twisted for its implementation. * Port blocking code to Twisted more easily, by keeping a backwards compatibility layer. * Allow normal Twisted programs that use threads to interact with Twisted more cleanly from their threaded … [View More]

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[Twisted-Python] tor hidden service endpoint parser returns a deferred
by David Stainton May 31, 2014

May 31, 2014

Greetings, Today I wrote an endpoint parser for Meejah's txtorcon Tor Hidden Service endpoint. Now that we have foolscap ported to twisted endpoints (branch needs review but I should probably rebase first) we'd like to be able to simply specify an "onion" endpoint descriptor in Tahoe-LAFS configuration... that way foolscap receives the descriptor and uses serverFromString to generate the endpoint object. This will work fine for the txsocksx tor client endpoint parser I wrote... However the … [View More]

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[Twisted-Python] deferToThread and trial
by Piper Masden May 30, 2014

May 30, 2014

I have some Klein code that uses deferToThread for I/O. It looks something like this: @app.route('/', methods=['GET'] def index(request, *args, **kwargs): d = deferToThread(some_blocking_db_select_function) def serialize(db_object): return json.dumps({ 'id': db_object, }) d.addCallback(serialize) return d I have a test that executes this function, and the deferToThread returns a Deferred, but that deferred never fires its callback, and so when … [View More]

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[Twisted-Python] Auto-Re: Twisted.email.smtp Module ERROR
by 甘肃电大 May 29, 2014

May 29, 2014

您发的邮件收到了!

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[Twisted-Python] Twisted.email.smtp Module ERROR
by VENKTESH GUTTEDAR May 29, 2014

May 29, 2014

Hello, i have written a script to send email by using the twisted smtplib in which i am trying to import the ESMTPSenderFactory from twisted.mail.smtp. but its giving the error as import error : no module name mail.smtp. so please someone help me to get rid of this error. i am using python 2.7 in ubuntu 13.10. thank you. -- Regards : Venktesh Guttedar.

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[Twisted-Python] Code question - semantic meaning of IServiceCollection(parent, parent)
by Jonas Brunsgaard May 26, 2014

May 26, 2014

Hello all Will someone explain to me what happens when you call an Interface with arguments, and why the same argument twice? My problem is to understand the semantics of the line parent = IServiceCollection(parent, parent) part of def setServiceParent(self, parent): if self.parent is not None: self.disownServiceParent() parent = IServiceCollection(parent, parent) self.parent = parent self.parent.addService(self) in twisted.application.… [View More]

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[Twisted-Python] Importing reactor changes PATHs?
by Merovingian May 26, 2014

May 26, 2014

Hello, Python 2.7.5 32 bit on Windows. Twisted 13.2.0 import ctypes dll = ctypes.CDLL("ssleay32.dll") Loads dll from the current folder import ctypes from twisted.internet import reactor dll = ctypes.CDLL("ssleay32.dll") Loads dll from Python27\lib\site-packages\OpenSSL How so? How can I prevent reactor from changing the PATH (or whatever it's changing)?

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[Twisted-Python] Weekly Bug Summary
by trac＠twistedmatrix.com May 25, 2014

May 25, 2014

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[Twisted-Python] doWrite called on a twisted.internet.unix.Port
by Killian De Smedt May 23, 2014

May 23, 2014

Hello everybody, I sometimes see the following error logged by a twisted application, it only happens sporadically and I cannot even reproduce when trying to re-execute the exact sequence of those failures. So giving an SSCCE is quite impossible for now (sorry). Given this trace it's also hard to find what was actually called/executed. Unhandled Error Traceback (most recent call last): File "/path/to/twisted.zip/twisted/python/log.py", line 88, in callWithLogger File "/path/to/twisted.… [View More]

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[Twisted-Python] Porting Twisted to Python 3.
by Maxim Lacrima May 22, 2014

May 22, 2014

Hello! I can see that Python 3 support in Twisted is incomplete. I was able to `pip install twisted` on Python 3, but I couldn't run a simple example program using Twisted Agent. A simple `from twisted.web.client import Agent` causes `ImportError: No module named 'twisted.python.systemd'` I would like to help in porting Twisted to Python 3. I have a couple of questions. My initial idea was to run some twisted tests with trial and start from there. But it looks like trial is not ported to … [View More]

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[Twisted-Python] IOpenSSLClientConnectionCreator was ContextFactory, now it's IOpenSSLClientConnectionCreator not ContextFactory
by exarkun＠twistedmatrix.com May 20, 2014

May 20, 2014

Hello, I just noticed that #7098 expanded the meaning of the objects Twisted typically refers to as "context factories". Prior to #7098, these were things that implemented a `getContext` method that returned an `OpenSSL.SSL.Context` instance. Subsequent to #7098, these are now *either* that or an object that provides `IOpenSSLClientConnectionCreator`. It seems that parts of Twisted itself were updated to reflect this change. For example, the very bottom of the TLS implementation stack … [View More]in Twisted, `twisted.protocols.tls`, acknowledges this change (I imagine this was unavoidable). Also, way on the other side of Twisted, `twisted.web.client.Agent` takes advantage of this change to implement the great new certificate and hostname validation features introduced in 14.0.0. However, other parts of Twisted itself were not updated. For example, the layers that sit in between `twisted.protocols.tls` and `twisted.web.client.Agent` weren't touched much. `SSL4ClientEndpoint`, for example, still documents its `sslContextFactory` as "SSL Configuration information as an instance of L{twisted.internet.ssl.ContextFactory}.". And, somewhat insanely I think, `IReactorSSL.connectSSL` still says "@param contextFactory: a L{twisted.internet.ssl.ClientContextFactory} object.". Merely from a documentation standpoint, this seems suboptimal. From a compatibility standpoint... Well, it seems incompatible to me. Perhaps this is an instance where the compatibility policy can be broken (though really that's academic since 14.0.0 has already been released, the policy has been broken already) but I don't recall any explicit discussion about a decision to do this. I *hope* and suspect there won't be much fall-out from this change considering it's hard to implement TLS and as far as I know there are no third-party implementations of `IReactorSSL` (GNUTLS came to mind but they have their own incompatible interface afaict). In other words, maybe we'll get lucky this time. I wrote this email instead of filing tickets about the documentation problems because doing the latter was implicit acknowledgement that this incompatible change is okay. Having written the email now, I see there's probably no going back, regardless. Maybe we can learn something from this incident and avoid repeating it with a more popular interface, though. We could probably add a description of this particular kind of incompatible change to the `CompatibilityPolicy` wiki page. If reviewers read that page, then they'll know to watch out for it. And of course (assuming we're committed to this direction, which we seem to be) we need to fix the rest of the "contextFactory" documentation throughout Twisted. I'll go file one ticket related to that now... Jean-Paul [View Less]

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[Twisted-Python] [ANN] thimble 0.1.0
by Laurens Van Houtven May 20, 2014

May 20, 2014

Hi everyone! thimble is a library that makes it easy to wrap blocking objects with a thread pool to give you an async API. In particular, it lets you selectively wrap blocking methods, and takes an explicit reactor and thread pool, making it at least slightly harder to do the obvious but potentially bad thing and tricky to test thing (global reactor state, using the reactor thread pool). (It's a thimble because it lets you play with threads without pricking yourself :-)) This is a small … [View More]

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[Twisted-Python] Why would someone need SSHTransportAddress?
by Adi Roiban May 19, 2014

May 19, 2014

This email is bases on comment from https://twistedmatrix.com/trac/ticket/5999 I fail to see the reason why SSHTransportAddress exist and why would anyone need It. SSHTransportAddress is an IAddress which has a single member called "address" and which is an IAddress ... In case SSHTransportAddress is useful and people should start using it, maybe this is a bug in SSHTransportAddress documentation as it should stat why someone want to use it instead of directly using any address define in … [View More]

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[Twisted-Python] Weekly Bug Summary
by trac＠twistedmatrix.com May 18, 2014

May 18, 2014

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[Twisted-Python] ANN: Eliot: a framework for Logging as Storytelling
by Itamar Turner-Trauring May 16, 2014

May 16, 2014

Eliot provides a structured logging and tracing system for Python that generates log messages describing a forest of nested actions. Actions start and eventually finish, successfully or not. Log messages thus tell a story: what happened and what caused it. Here's what your logs might look like before using Eliot: Going to validate http://example.com/index.html [1]. Started download attempted. Download succeeded! Missing <title> element in "/html/body". Bad HTML entity in "/html/body/p[… [View More]

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[Twisted-Python] TCP and ICMP
by Jay Shah May 13, 2014

May 13, 2014

Hiee All, I have very simple question. I have already implemented custom reactor for handling ICMP requests (reference: txnettools) . My problem is: i am implementing tcp traceroute. I have handled all icmp time exceed messages. But, i want to handle tcp syn-ack reply which i am getting from remote server. How can i do that ? Can i start listening to TCP syn req or replies on the same reactor on which i am listening to icmp replies ? or should i install new custom reactor for listening to tcp … [View More]

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[Twisted-Python] Twisted 14.0.0 Release Announcement
by HawkOwl May 12, 2014

May 12, 2014

On behalf of Twisted Matrix Laboratories, I am honoured to announce the release of Twisted 14.0! It has been a long road to get here, but we’ve done it! The highlights of this release are: - Twisted Positioning (`twisted.positioning`) makes its entry into Twisted! It comes ready to talk with common GPS devices, and will supersede `twisted.protocols.gps`. - A wealth of SSL/TLS improvements, including ECDHE support, TLS Service Identity (with service_identity on PyPI), a stronger default set … [View More]

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[Twisted-Python] Distributing apilinks.py
by Adi Roiban May 11, 2014

May 11, 2014

Hi, Right now apilinks.py is located in Twisted at docs/_extensions/apilinks.py, but a copy can also be found in pydoctor project. While reporting a bug for apilinks.py in Twisted I was ask to send the patch upstream in pydoctor [1] During the review of the patch in pydoctor, pydoctor's maintainer agreed that there should be a single copy of this file but don't know what's involved in achieving that. [2] Can someone involved in using apilinks.py in Twisted provide some feedback regarding … [View More]

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[Twisted-Python] Weekly Bug Summary
by trac＠twistedmatrix.com May 11, 2014

May 11, 2014

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