Mailman 3 March 2002 - Twisted

[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] [patch] mktap web --resource
by Sune Kirkeby 12 Aug '02

12 Aug '02

Hi, all! Attached is a short patch to add a --resource option to "mktap web", here is the --help for it: -r, --resource= <class> is the name (including module) of a subclass of twisted.web.resource.Resource to publish. So you can have any subclass of t.w.r.Resource be the 'root' of your web-server. I have also been working on a few other things: - an async Pytho-only PostgreSQL interface (not t.e.adbapi compatible, since I am not usre I like it's interface and need to play a bit before I figure out how I would like an async SQL-database interface to behave.) - a SQLResultWidget, very dull right now but I will probably hack some BoboDTML support into it. first-post-but-not-like-/.-ly yrs, -- Sune Kirkeby | /* we're still looking for the end of the | * server's header ... (does that make header | * parsing an "out of body experience" ? */ | -- jcc.c in junkex source-code

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[Twisted-Python] We now have a coil command-line app in CVS
by Itamar Shtull-Trauring 02 Apr '02

02 Apr '02

Now you can configure your TAP files through the web! Usage: coil [--new=<application name>] <tap file> Options: -n, --new= -p, --port= [default: 9080] For example, to configure a TAP generated by mktap: $ mktap web $ coil web.tap (now point browser at http://localhost:9080) Or to create a new TAP: $ coil --new=myapp new.tap (now point browser at http://localhost:9080)

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[Twisted-Python] More coil TODOs
by Itamar Shtull-Trauring 01 Apr '02

01 Apr '02

== Make ports visible == Currently, tcp/udp/ssl are treated as collections of protocol factories. I am going to change this to collections of Ports, so that you can configure interfaces to listen on, context factories for SSL, etc. The protocol factory will just be another attribute. This should have no effect on people who are coiling their apps. == Make old TAPs work == The refactor broke old taps - they can no longer be loaded since they refer to non-existence classes in twisted.internet.app. This can probably be easily solved (make a dummy PortsCollection class and delete the attributes of the loaded application that refer to it.)

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[Twisted-Python] New Member
by Joan Torres 01 Apr '02

01 Apr '02

Hi, My name is Joan Torres, I'm working in Port of Barcelona (spain), and I'm interested in learning more about how to use Twisted. I've two Python applications running on a Unix platform, both applications return a file as a result, and I want to write a server for them. The server should do the following things: - Execute Application1 every 10 minutes - Run Aplication1 on demand. - Keep the last file returned by application 1 - Execute Aplication2 on demand. There would be three different types of clients (windows platform): * Client type 1: get the latest file returned by applition1 * Client type 2: run application1 and get the returned file * Client type 3: run application2 and get the returned file The estimated amount of connections at a time could be: -clients type 1: 100 -clients type 2: 2-3 -clients type 3: 2-3 Could anyone give me some light on it?

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[Twisted-Python] CVS broken?
by Itamar Shtull-Trauring 31 Mar '02

31 Mar '02

Each time I checkin a file, the CVS process then gets stuck (if I check-in two files it gets stuck after the first). I'm not sure why -- perhaps this is relevant (as pointed out by Tv): http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=102292 Or perhaps it's some other issue.

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[Twisted-Python] Twisted bug -- bad interaction with popen
by Itamar Shtull-Trauring 31 Mar '02

31 Mar '02

This bug needs an answer from someone with unix expertise: <http://www.twistedmatrix.com/users/itamarst.twistd/bugs/view_bug?bug_id=8> I suggest getting rid of SIGCHLD handler, and having t.i.process.Process instances keep track of the pid of their process, and pass it to reapProcess so it only waitpid()s on a specific pid, and not all of them. I will add a test case which will test for this bug.

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[Twisted-Python] Coil refactor more or less done
by Itamar Shtull-Trauring 30 Mar '02

30 Mar '02

Hi, Background: COIL is a configuration system for Twisted, allowing you to manage and configure your server via the web, developed by glyph. To test it out: $ mktap coil $ twistd -n -f coil.tap And point your browser at http://localhost:9080 In CVS, the coil system has been refactored, and now resides in twisted.coil. I feel that at this point it is now usable for configuring real apps. Real world use will help us find missing requirements and find issues and bugs. Examples of how to use it can be found in twisted.coil.plugins. Things that should really be coiled include cred, to the point that you can use coil to administrate users for manhole. t.mail is another candidate, and of course any servers based on twisted. If you are not using CVS Twisted, do not use coil - the interfaces have all been changed. You can still play around with it however, since it does work in the released code as well.

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[Twisted-Python] MSN client code preview
by Ivo van der Wijk 30 Mar '02

30 Mar '02

Hi all, I did some heavy refactoring on my python MSN code this weekend. If anyone is interested in taking a sneak preview at the code (and comment on the API, etc), feel free to download some code at: http://ivo.freezope.org/pymsn200203250.tgz There's no docs (except for an msn protocol description), but there are two sample programs included: 'client.py' which is a very simple gtk/glade interface, and 'msntxttest.py' which basically echoes back anything that's sent to the client. The code is at this moment still very incomplete, and still needs loads of work, but you should be able to login using an existing msn handle/password, and send/receive messages. At this moment, I've only tested with everybuddy at the other end of the session - it may be that MS's msn client sends more noise that confuses the clients - I'll test this later. Patches, remarks, suggestions are welcome. Cheers, Ivo (VladDrac @ OPN) -- Drs. I.R. van der Wijk -=- Brouwersgracht 132 Amaze Internet Services V.O.F. 1013 HA Amsterdam, NL -=- Tel: +31-20-4688336 Linux/Web/Zope/SQL/MMBase Fax: +31-20-4688337 Network Solutions Web: http://www.amaze.nl/ Consultancy Email: ivo(a)amaze.nl -=-

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[Twisted-Python] Re: [Twisted-commits] Better collection support for coil.
by Glyph Lefkowitz 30 Mar '02

30 Mar '02

On Mon, 2002-03-25 at 05:34, itamarst CVS wrote: > If a configurable class is not collection, coil's web interface will > check if the Configurator class is a collection, allowing us to have > Configurators that act as collections. > A remaining issue is twisted.web.vhost, and other similar cases, where > both the Configurator and the configurable class should really be > collections. IMHO, the way this should work is: check the Configurator first. It is the authority on collection-hood, as it were. :-). If the *configurator* is not a collection, then check the configurable; this strikes me as a less likely case... in fact, it seems weird to introspect on the configurable at all at this point, since it isn't the configuration component. Does that make sense?

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[Twisted-Python] Coil command-line app
by Itamar Shtull-Trauring 27 Mar '02

27 Mar '02

Hi all, I will soon be writing a coil command line app. It will let you edit an exisiting .tap. Ports it creates will not be activated, and its own webserver won't show up in the config interface since it will be configuring a different Application insatnce. This will very likely replace "mktap coil" for most uses. It'll working something like this: $ coil exisiting.tap (config an existing tap) $ coil -n "email-server" email.tap (create a new application instance and store it in tap) Any suggestions for possible functionality?

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[Twisted-Python] Anonymous CVS pserver access
by Christopher Armstrong 24 Mar '02

24 Mar '02

Today I added an "anon" user to the pserver running on zaibach, allowing anonymous users to check out the CVS Twisted code. The commands: cvs -d:pserver:anon@twistedmatrix.com:/cvs login You can just hit <enter> when you get the password prompt, then: cvs -d:pserver:anon@twistedmatrix.com:/cvs co Twisted You should then have the Twisted code in the "Twisted" subdirectory. I added a "CVS Access" page to the website at http://twistedmatrix.com/developer/cvs, if anyone wants to write up a paragraph on accessing the repository through windows, it'd be appreciated; if not, I'll add it the next time I get around to twiddling with wincvs. -- Chris Armstrong << radix(a)twistedmatrix.com >> http://twistedmatrix.com/users/carmstro.twistd/

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[Twisted-Python] Aaargh
by Itamar Shtull-Trauring 20 Mar '02

20 Mar '02

""" The Win32 event mechanism (e.g. WaitForMultipleObjects()) can only wait on 64 event objects at a time. """ Same as select(). so we may need to use multiple threads for the win32 event loop.

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[Twisted-Python] win32 process problem
by Drew Whitehouse 20 Mar '02

20 Mar '02

Hi Itamar, I'm just getting into twisted, after our IRC chat the other day. Looks like it does everything I need (plus a lot more !). I'm having some trouble with Process and win32, i.e. I'm already using bleeding edge CVS versions ... I'm trying to run a http server which services XMLRPC calls. The XMLRPC calls then have to launch a process that the server needs to keep track of, getting notified when the process exits. Anyhow it seems the new win32 process stuff is giving trouble. It only allows one XMLRPC call before the server hangs. I'm testing with the following code. I realize that this code is brand new, but thought I'd send it along in case you hadn't seen the problem already. -Drew -----------server.py------------------ import sys,os if sys.platform == 'win32': from twisted.internet import win32 print 'Installing WIN32 version of process handling etc ...' win32.install() from twisted.web import xmlrpc from twisted.python import defer import xmlrpclib class Echoer(xmlrpc.XMLRPC): def _getFunction(self, functionPath): """Convert the functionPath to a method beginning with 'xmlrpc_'. For example, 'echo' returns the method 'xmlrpc_echo'. """ f = getattr(self, "xmlrpc_%s" % functionPath, None) if f: return f else: raise xmlrpc.NoSuchFunction def xmlrpc_hello(self): """Return 'hello, world'.""" return 'hello, world!' def main(): from twisted.internet.app import Application from twisted.web import server app = Application("xmlrpc") r = Echoer() app.listenTCP(7080, server.Site(r)) app.run(0) if __name__ == '__main__': main() and -------client.py------------------------ import xmlrpclib proxy = xmlrpclib.Server("http://localhost:7080/") r = proxy.hello() print r -Drew ;; Drew.Whitehouse(a)anu.edu.au Sci-Viz/VR Programmer ;; http://anusf.anu.edu.au/~drw900 ANUSF VIZLAB ;; Australian National University Supercomputer Facility

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[Twisted-Python] New scripts
by j.her＠t-online.de 19 Mar '02

19 Mar '02

Hi! mktap is now fully moved to twisted.scripts. Would be nice if people moved the commands they use the most, or are related to the part they developed. What to do: 1. Copy the code of the command to twisted/scripts/command.py. Then first commit it unchanged, so there is a clear history! 1. Move as much code as possible into a function named run(); try to avoid top-level code if you can, since that is a problem for doc-tools, pychecker, etc. 2. Replace the command in bin/command by its stub, i.e. by the new preamble + the import/run() combo. Don't skip this step, since otherwise ppl will start to edit at two places, which leads to chaos! See bin/mktap and twisted/scripts/mktap.py for an example. In the long run, especially when all commands are moved, be can remove the bin directory, since it's created in build/scripts anyway. For now, it allows smooth transition. Ciao, Jürgen

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[Twisted-Python] mktap seems to work
by j.her＠t-online.de 18 Mar '02

18 Mar '02

[...\python22]Scripts\mktap.bat --help web Usage: mktap web [options] Options: --personal Instead of generating a webserver, generate a ResourcePublisher which listens on ~/.twistd-web-service ... Ciao, Jürgen

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[Twisted-Python] cvs script failure
by j.her＠t-online.de 18 Mar '02

18 Mar '02

Hi! On a second look, this seems to be caused by CVS using my local settings. Still, shouldn't the CVS scripts take care to use a special, well-known system path to "their" Twisted? Ciao, Jürgen

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[Twisted-Python] cvs scripts failure
by j.her＠t-online.de 18 Mar '02

18 Mar '02

some checkin script fails: WARNING: Python C API version mismatch for module cBanana: This Python has API version 1010, module cBanana has version 1009. <__main__.MyOptions instance at 0x8209f34> Traceback (most recent call last): File "loginfo.py", line 161, in ? config.parseOptions() File "/home/jh/lib/python/twisted/python/usage.py", line 119, in parseOptions for long, short in flags: Directory /cvs/Twisted/twisted/scripts added to the repository ValueError: unpack tuple of wrong size time for a version-specific bangpath? Ciao, Jürgen

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[Twisted-Python] Some Win32 comments
by Tyler W. Wilson 18 Mar '02

18 Mar '02

I was trying to get the Twisted IM client running, and have a few comments related to config issues on Win32. Here they are: 1 running 'python setup.py install' copies the twisted folder to the <python>\lib\site-packages folder, which is okay. but if you change to the Twisted<version> folder and do 'python bin\im', it will be using the sources from the original location, NOT the site-packages location. 2 similar to the above, if you set PYTHONPATH to point to Twisted<version> folder, as it says to do in the README, the original twisted files will be used, not those copied to the site-packages folder. so, given 1 & 2, do we really need to do the setup.py? It should be noted in the README(.win32?) that users should either: 1) set PYTHONPATH to Twisted<version> and NOT run setup.py, and include the full path to im, mktap, etc, or 2) do NOT set PYTHONPATH, run setup.py, and still include the fullpath to the bin folder. i would also suggest that the files in the bin folder have the .py extension, so that on Windows we can associate them to the python interpreter, which would simplify things. 3 im (Tk) fails to save config state, if HOME is not set, since the ~ will return exactly, and this is an invalid filename charcter under Win9x. Either split it to check, or put in an error/warning. here is a fix i made to mine, which should work on all platforms: tkim.py, line 912: path = ".imsaved" home = os.path.expanduser("~") if home != "~": path = home+os.sep+path Thanks, Tyler

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[Twisted-Python] We now have a bug tracker
by Itamar Shtull-Trauring 18 Mar '02

18 Mar '02

http://twistedmatrix.com/users/itamarst.twistd/bugs/ It's using twisted.bugs, which is of course still a work in progress, but it's good enough to add bugs to. Please submit all and any bugs, feature wishes and so on.

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[Twisted-Python] This seems too good to be true... :-)
by Nils R Grotnes 17 Mar '02

17 Mar '02

Hi! I know I probably should lurk-a-lot-first, so please just tell me to shut up if I'm somehow out of line here... I like to state up front that I'm fresh, fresh and fresh. I switched to Debian just recently, I have just read my first Python book, and I didn't know this place existed until a week ago. The latter is what I wonder about in the Subject. How come it was so hard to find you? I have lurked quite a lot on comp.lang.python and c.l.p.announce, and I have surfed around on a lot of Python websites, but the first I ever heard of twisted was in c.l.p.a on the 9th. I'm very impressed with your setup and what I have seen of the code so far, so I figure _something_ must be wrong. :-) Ah, well. I hope I'm wrong, because I'd love both to use this stuff, and help out. I have coded a few (professional) projects before, but only in VB, so I'll keep my defiled hands off the code here until I've de-learned most of my bad habits... :-) Hopefully I can do some bug-hunting, testing and maybe even a little documentation after a while? (I dual boot to Win95 and have installed ActivePython there, if that can be useful.) My first try to do more than babble, will be a suggestion I couldn't find anything about in the archive; On my Debian, the package is installed in /usr/lib/python2.1/site-packages/twisted, but there's no twisted.pth file in the site-packages directory. After I added such a file (only containing the word "twisted" without the apostrophes) I now have twisted in sys.path when I start a Python shell. If it was missing for some good reason, I'd like to know it... Nils

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[Twisted-Python] "3D Game Using Twisted?", or: "Ach du lieber..."
by Derek Simkowiak 14 Mar '02

14 Mar '02

Hello. My name is Derek Simkowiak, I've just been introduced to Twisted by Sean Riley (sean at twistedmatrix dot com). I'm using (and now contributing to) his PyUI widget set for my 3D game engine. When I told him I still needed to write the networking code, he pointed me here. I wanted to introduce myself, ask for some general guidance about a network protocol, and point out that the documentation titled "The Basics" at http://twistedmatrix.com/page.epy/docs/basics.html results in "no such page", which really sucks for somebody just getting started (like me). First, a little bit about my game engine, because it's the type of thing you twisted Twisted people might be interested in: o OpenGL for rendering o SDL for event management o Quake2 BSP map rendering (many more model formats to come soon) - includes almost all of the Id BSP culling tricks - includes fully-functional collision detection using the Q2 "bloated planes" algorithm, as figured out by Kekoa Proudfoot o Complete in-game GUI over the top of the 3D world, including transulency, using the PyUI widget set. Screenshot at: http://www.realloc.net/~dereks/targa_pyui1.jpg Also see the older shots at: http://www.realloc.net/~dereks/commputers/my_code/targa/ Also, the big piece that you may like: I've recently refactored the whole damn thing, and with a little help from SWIG my "engine" is now nothing more than some Python C extensions. My "main event loop" is just a simple Python script, and because all the [bottlenecking] rendering code is still C, I get the ~70 FPS I was getting when the entire engine was pure C. But now I have Python at my disposal, mua ha ha. (Also, note that all the libraries are cross-platform. I'm developing under Linux, but eventually this thing should run under MS-Windows, Mac OS X, AmigaOS, and even PlayStation2.) The big pieces I have left are the enemy A.I. and the networking code. This is a client-server engine. The light at the end of the tunnel is load-balanced Linux cluster (using LVS) serving up a persistent, 3D world (ala' PlanetSide), and maybe even me making some $$$ from a few hundred subscribers paying $5/month. Now you see where Twisted fits in -- I'm basically shooting for twisted.reality in real-time 3D. My concern is regarding bandwidth. My game protocol will be similar to the Quake2 protocol, meaning huge lists of 'entities' are updated with position and orientation data as often as possible. Such generic position updates will be done with UDP, and 'critical' packets (such as damage, explosions, jumps, messages, etc.) will be done with TCP. In summary, every single byte of network overhead matters -- nay, every BIT matters (npi). So I've browsed through the API docs, but I don't have any context to know what I'm looking at. I'll be downloading and installing the source soon, but in the meantime... any advice? Is there any particular package I should be looking at (other than twisted.internet)? Does Twisted's networking code cater to somebody who needs to, for example, do bitshifting and compression to absolutely minimize the bandwidth requirements? What approach would you take? Note that, using PyUI for the GUI and [possibly] Twisted for the server, I want to have things like in-game "IRC/ICQ", in-game "emails", and also in-game "voice chat" ala CounterStrike 1.3. Other wild ideas include in-game video conferencing, and dynamically-downloaded bits of Python code that would act as all-new, not-previously-imagined entities. (Note that by "in-game" I mean the 3D world is rendered, and the email/IRC/video client application is rendered on top of the 3D world with some translucency. The idea is to keep the player immersed.) Any advice is greatly appreciated. If anybody else is using Twisted for something similar, I'd love to hear about it. Thanks, Derek Simkowiak dereks at realloc dot net

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[Twisted-Python] Issues with roots.Collections in regards to Coil
by Itamar Shtull-Trauring 14 Mar '02

14 Mar '02

(If this doesn't make sense, you can probably ignore it. At some point we might make a twisted-dev list.) Issues: 1) The problem where you click on a virtual host's sub-Resource in web coil and you can't configure it. Dunno why. (I fixed some similar effect bugs which were caused by *someone* using MOVED_PERMANENTLY and ignoring the fact this gets cached by browsers, but that's not the issue here.) 2) The UI assumes entities in a collection are mutable, i.e. first created, and then separately configured via a Configurator. This conflicts with stuff like making a Collection for configuring a mapping of strings (e.g. the mime types mapping in static.File). Possible solution is a custom Collection class for these situations that gets its own web coil UI. 3) Collections of Configurators or of configurables? I would think that they should stay the way they are -- collections of configurables. It's easy to wrap an object coming from a collection - that's what is done now. And it's easier to code the Collection this way, esp. since the configurable classes can be collections too, in cases where it makes sense (e.g. web.resource.Resource.) In most situations of course the Collections would only be coded in the coil plugin, but it's useful to be able to have the configurable class be a Collection. What were your issues, glyph?

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[Twisted-Python] HTML in documentation
by Chris Armstrong 12 Mar '02

12 Mar '02

It has become apparent to me that we need to standardize the tags we use in HTML documentation for Twisted. This will make it easier to apply stylesheets to it, as well as use processing tools to convert it to other formats. Here is my proposal (This is especially aimed at Moshe, since he is the HTML purist of the bunch, and I want to make sure he's happy with these so he won't decide to rebel and start his own repository of docs again ;-)). So I would like it if at least Moshe and Glyph were to both reply to me in some fashion, even if with a simple "yes" or "no" (if it's a "no", a short explanation would be nice ;-)). Of course others are very much encouraged to chime in. The three of us aren't the only important ones around here, by a long shot. ;-) 1.) For code-snippets that are separated from paragraph content, we should either use the <code> tag, along with <pre>. for example: ---- <p> For example, this is how one defines a Resource: </p> <p> <code><pre> from twisted.web import resource class MyResource(resource.Resource): def render(self, request): return "Hello, world!" </pre></code> </p> ---- The <pre> shall not be assigned any special semantic value in processing tools or StyleSheets. It is only there so browsers will render it correctly. Special semantics shall only be assigned to <code>. 2.) For single-line code-snippets and attribute/method/module-names interpolated in a paragraph, <code> shall also be used, but without the <pre> tag. Also, module and class names should be specified with their fully-qualified name, and have a link to the API documentation, which is assumed to be in ../api/current/ (this is how it will be set up on the web-site). Regular attribute names don't need to be fully qualified (as this wouldn't make sense), but should still be enclosed in <code> tags. For example: ---- <p>To add a <a href="../api/current/twisted/web/widgets_Widget.html"><code>twisted.web.widgets.Widget</code></a> instance to a <a href="../api/current/twisted/web/widgets_Gadget.html"><code>twisted.web.widgets.Gadget</code></a> instance, do <code>myGadget.putWidget("widgetPath", MyWidget())</code>. </p> <p> (implementation note: the widgets are stored in the <code>gadgetInstance.widgets</code> attribute, which is a list.) </p> ---- I realize that adding the links to the API documentation everywhere is ugly, so I suppose it would be fine to only add the link to the first instance a module/classname shows up in the document. Just make sure there's a link in there somewhere. Maybe I'll hack on generate.py to automatically insert the links when it sees a fully-qualified twisted.* name... (but this doesn't mean one should completely disregard linking to API docs -- the idea is to have the HTML documents be browsable both with *or* without pre-processing) 3.) It goes without mentioning that one should use <hN> in a sane way to organize the document: the only <h1> shall be the title of the document, <h2> shall be sections, <h3> sub-sections, etc. 4.) Tags that have an optional closing tag should have the optional closing tag (ie, <li> and </li>). This makes it easier for some editors and processing tools to work with the code. This point isn't all that important. If it bothers someone enough, I can deal without having them. :-) 5.) Glyph says we should use XHTML, but he's a dork. Discuss. ;-) That's about it. Any other suggestions? If everyone agrees to this, I'll go through all the existing docs and update them with these rules (I doubt there will be many updates), and probably create a style-sheet to render them nicely. p.s. -- The only rules I notice that differ with Moshe's style in his existing documentation are 1.) he doesn't use <code> around multi-line code snippets and 2.) he doesn't have ending </li> tags. Is this a problem for you, Moshe?

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[Twisted-Python] Automatic reconnection
by Andrew Bennetts 11 Mar '02

11 Mar '02

Hi all, I need a tcp.Client that can automatically reconnect when disconnected. I've written the following class, and it seems to work, but... * It doesn't handle unix sockets (that's ok for me, I'm using Windows, so I never had them in the first place) * I'm not sure what the "connector" is, and thus I suspect it won't for Clients that use it. * It's only lightly tested Is there a better way to do this (i.e. is there a way to do this already in Twisted, and I just haven't found it yet)? Otherwise, I'd be interested in knowing if anyone else would find this useful, or if maybe it should be included in Twisted. I suspect I'm not the only person who wants to be able to write a server which automatically tries to recover from "upstream" problems. -Andrew. Code: class ReconnectingClient(tcp.Client): """A tcp.Client that automatically reconnects when disconnected Overrideable attributes: * reconnectionDelay -- number of seconds to wait before reconnecting * maxReconnects -- maximum number of reconnects before giving up. The reconnection counter is reset after a successfull reconnection. Set this to None to keep retrying indefinitely. The protocol will have connectionLost called as normal when disconnected, but may get reconnected after that -- so if you need to reset anything in your protocol after a disconnection, do it in Protocol.connectionLost. """ reconnectionDelay = 3.0 maxReconnects = 5 def __init__(self, host, port, protocol, timeout=None, connector=None): tcp.Client.__init__(self, host, port, protocol, timeout, connector) self.reconnectAttempts = 0 self.reconnectProtocol = protocol def connectionLost(self): # Disconnect as normal tcp.Client.connectionLost(self) # Then schedule a reconnect if main.running: # FIXME: Is this test necessary? print 'Lost connection, reconnecting...' main.addTimeout(self.reconnect, self.reconnectionDelay) def reconnect(self): if not self.connected: if (self.maxReconnects is None or self.reconnectAttempts < self.maxReconnects): self.reconnectAttempts += 1 tcp.Connection.__init__(self, self.createInternetSocket(), self.reconnectProtocol) self.doConnect() main.addTimeout(self.reconnect, self.reconnectionDelay) else: print 'Reconnection failed after %d attempts. Giving up.' \ % (self.reconnectAttempts,) else: # Reset the reconnect counter if we're connected. self.reconnectAttempts = 0

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[Twisted-Python] Re: Twisted protocol
by Andrew Bennetts 11 Mar '02

11 Mar '02

On Mon, Mar 11, 2002 at 06:51:57PM +0100, David wrote: > Hello spiv, this is supposed to be reaching you =) > I was told by radix on #python@opn that you had written "a little proxy > protocol which dispatches to multiple other protocol objects" in > twisted. This is exactly what i need for a project of mine. > I'd very much appriciate if you would share this little piece of code > with me or alternativly explain how it works. Heh. I'm CC'ing the list with this, just for the sake of it :) Here is the class. I created it for a case where I had a protocol that was sometimes inheriting from one Protocol, and sometimes another, and I didn't want to diddle with __bases__ or munge the two bases into one class (although perhaps that is the "better" solution?). If you like, imagine PacketBasedProtocolA/B to be basic.LineReceiver and Int32StringReceiver, where lineReceived and stringReceived are both aliased to packetReceived. class ProxiedPacketProtocol(Protocol): """General packet-based protocol. This class provides a simple way to use either PacketBasedProtocolA or PacketBasedProtocolB (or potentially others) as protocol for a data feed, without having to change which one you inherit from at runtime. It basically acts as a proxy protocol between the low-level protocol and your subclass. Simply override parentProtocol with the "parent" protocol (the default is PacketBasedProtocolA) and then when packetReceived is triggered in the parent, packetReceived is called in me. Inherit from this class, and override packetReceived.""" parentProtocol = PacketBasedProtocolA packets = {} # This is copied to the parent def __init__(self): # Create a private subclass of the parentProtocol so that we can # override its class-level data attribute(s). class ParentProtocol(self.parentProtocol): packets = self.packets # Create the parent protocol self.parent = ParentProtocol() # Raw data should get delivered to the parent... self.dataReceived = self.parent.dataReceived # ...and processed packets should come back to me self.parent.packetReceived = self.packetReceived self.parent.unknownPacket = self.unknownPacket # Data from the pinger needs to come via me self.parent.transport = self.transport def packetReceived(self, packet): """Override this. Called whenever the parentProtocol receives a packet.""" pass def unknownPacket(self, messageType, data): print "Received unknown packet of type '%s': %s" \ % (messageType, repr(data)) David, I hope this is what you were after :) It should be fairly easy to use and adapt -- but my question for the list is, is it worth the extra effort it would take to make this more general? i.e. take arbitrary lists of attributes to copy from the parent to the proxy (and vice versa?), instead of hard-coded names in __init__? My other question is, is this a useful enough concept to include it in Twisted? :) -Andrew.

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[Twisted-Python] Win32 updates
by Itamar Shtull-Trauring 11 Mar '02

11 Mar '02

1) win32 process support is checked in and (lightly) tested. Just twisted.internet.win32.install() and it's there. For CGI support we're gonna need to write a small parser thing that can grok unix style "#!c:\python2.1\python.exe" interpreter lines. 2) Because the process tests install the win32 event loop, I discovered the win32 event loop breaks the the DNS client/server testing code, so currently these tests do *not* pass. Anyone know about issues with WSAEventSelect and UDP?

2 1

[Twisted-Python] docs
by Christopher Armstrong 11 Mar '02

11 Mar '02

I just shwacked all the HTML files in the 'doc/' directory and put them in the TwistedDocs repository. This repository will be populated with HTML documentation which have '.htc' suffixes -- these files *are* just plain old HTML. I copied/hacked 'generate.py' from the WebSite repository to be able to convert regular HTML to HTML-without-headers-and-footers, and also be able to extract the title from the <title> tags of the .htc document. the generate.py script generates "prettier" html documents with no suffix according to a template document which is passed to it on the command line. The generate script also converts all links to "foo.htc" to "foo", thus making linking transparent wether you're browsing un-processed docs or not. Anyway, you people who are simply writing the docs don't need to worry about anything -- just write html files with .htc suffixes and link between them as you would expect. :-) </babble> -- Chris Armstrong << radix(a)twistedmatrix.com >> http://twistedmatrix.com/users/carmstro.twistd/

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[Twisted-Python] Yet another win32 process
by Itamar Shtull-Trauring 09 Mar '02

09 Mar '02

This one uses the win32 event loop for reading from stdout and stderr, and starts one thread per Process for writing to stdin. So we're down to one thread per Process instead of 3, thanks to Andrew's suggestion. """ Win32 process support. """ # Twisted imports from twisted.internet import abstract, main, win32 # System imports import win32api import win32pipe import win32file import win32process import win32security import win32con import win32event import pywintypes import msvcrt import os import sys import threading import Queue import string class Process(abstract.FileDescriptor): """A process that integrates with the Twisted event loop.""" buffer = '' def __init__(self, command, args, environment, path): # security attributes for pipes sAttrs = win32security.SECURITY_ATTRIBUTES() sAttrs.bInheritHandle = 1 # create pipes hStdin_r, self.hStdin_w = win32pipe.CreatePipe(sAttrs, 0) self.hStdout_r, hStdout_w = win32pipe.CreatePipe(sAttrs, 0) self.hStderr_r, hStderr_w = win32pipe.CreatePipe(sAttrs, 0) # set the info structure for the new process. StartupInfo = win32process.STARTUPINFO() StartupInfo.hStdInput = hStdin_r StartupInfo.hStdOutput = hStdout_w StartupInfo.hStdError = hStderr_w StartupInfo.dwFlags = win32process.STARTF_USESTDHANDLES # Mark doesn't support wShowWindow yet. # StartupInfo.dwFlags = StartupInfo.dwFlags | win32process.STARTF_USESHOWWINDOW # StartupInfo.wShowWindow = win32con.SW_HIDE # Create new output read handles and the input write handle. Set # the inheritance properties to FALSE. Otherwise, the child inherits # the these handles; resulting in non-closeable handles to the pipes # being created. pid = win32api.GetCurrentProcess() tmp = win32api.DuplicateHandle( pid, self.hStdin_w, pid, 0, 0, # non-inheritable!! win32con.DUPLICATE_SAME_ACCESS) # Close the inhertible version of the handle win32file.CloseHandle(self.hStdin_w) self.hStdin_w = tmp tmp = win32api.DuplicateHandle( pid, self.hStdout_r, pid, 0, 0, # non-inheritable! win32con.DUPLICATE_SAME_ACCESS) # Close the inhertible version of the handle win32file.CloseHandle(self.hStdout_r) self.hStdout_r = tmp tmp = win32api.DuplicateHandle( pid, self.hStderr_r, pid, 0, 0, # non-inheritable! win32con.DUPLICATE_SAME_ACCESS) # Close the inhertible version of the handle win32file.CloseHandle(self.hStderr_r) self.hStderr_r = tmp # start the process. print "creating process" cmdline = "%s %s" % (command, string.join(args, ' ')) hProcess, hThread, dwPid, dwTid = win32process.CreateProcess( None, # program cmdline,# command line None, # process security attributes None, # thread attributes 1, # inherit handles, or USESTDHANDLES won't work. # creation flags. Don't access the console. 0, # Don't need anything here. # If you're in a GUI app, you should use # CREATE_NEW_CONSOLE here, or any subprocesses # might fall victim to the problem described in: # KB article: Q156755, cmd.exe requires # an NT console in order to perform redirection.. environment, # new environment path, # new directory StartupInfo) # normally, we would save the pid etc. here... print "process created" # Child is launched. Close the parents copy of those pipe handles # that only the child should have open. # You need to make sure that no handles to the write end of the # output pipe are maintained in this process or else the pipe will # not close when the child process exits and the ReadFile will hang. win32file.CloseHandle(hStderr_w) win32file.CloseHandle(hStdout_w) win32file.CloseHandle(hStdin_r) self.outQueue = Queue.Queue() self.closed = 0 self.stdoutClosed = 0 self.stderrClosed = 0 threading.Thread(target=self.doWrite).start() win32.addEvent(self.hStdout_r, self, self.doReadOut) win32.addEvent(self.hStderr_r, self, self.doReadErr) def write(self, data): """Write data to the process' stdin.""" self.outQueue.put(data) def closeStdin(self): """Close the process' stdin.""" self.outQueue.put(None) def connectionLost(self): """Will be called twice, by the stdout and stderr threads.""" if not self.closed: win32.removeEvent(self.hStdout_r) win32.removeEvent(self.hStderr_r) abstract.FileDescriptor.connectionLost(self) print "connection lost" self.closed = 1 self.closeStdin() win32file.CloseHandle(self.hStdout_r) win32file.CloseHandle(self.hStderr_r) def doWrite(self): """Runs in thread.""" while 1: data = self.outQueue.get() if data == None: break try: win32file.WriteFile(self.hStdin_w, data, None) except win32api.error: break win32file.CloseHandle(self.hStdin_w) def doReadOut(self): """Runs in thread.""" try: hr, data = win32file.ReadFile(self.hStdout_r, 8192, None) except win32api.error: self.stdoutClosed = 1 if self.stderrClosed: return main.CONNECTION_LOST else: return self.handleChunk(data) def doReadErr(self): """Runs in thread.""" try: hr, data = win32file.ReadFile(self.hStderr_r, 8192, None) except win32api.error: self.stderrClosed = 1 if self.stdoutClosed: return main.CONNECTION_LOST else: return self.handleError(data) if __name__ == '__main__': win32.install() def printer(x): print "Got", repr(x) exe = win32api.GetModuleFileName(0) print exe p = Process(exe, ['-u', 'processtest.py'], None, None) print "ok, made process object" p.handleChunk = printer p.handleError = printer p.write("hello, world") p.closeStdin() main.run()

1 0

[Twisted-Python] twisted.internet.process for Win32
by Itamar Shtull-Trauring 09 Mar '02

09 Mar '02

I've attached my current code, which seems to be working. This will hopefully be checked in today, but some testing by others would be useful. """ Win32 process support. """ # Twisted imports from twisted.internet import task, abstract # System imports import win32api import win32pipe import win32file import win32process import win32security import win32con import win32event import pywintypes import msvcrt import os import sys import threading import Queue import string class Process(abstract.FileDescriptor): """A process that integrates with the Twisted event loop.""" buffer = '' def __init__(self, command, args, environment, path): # security attributes for pipes sAttrs = win32security.SECURITY_ATTRIBUTES() sAttrs.bInheritHandle = 1 # create pipes hStdin_r, self.hStdin_w = win32pipe.CreatePipe(sAttrs, 0) self.hStdout_r, hStdout_w = win32pipe.CreatePipe(sAttrs, 0) self.hStderr_r, hStderr_w = win32pipe.CreatePipe(sAttrs, 0) # set the info structure for the new process. StartupInfo = win32process.STARTUPINFO() StartupInfo.hStdInput = hStdin_r StartupInfo.hStdOutput = hStdout_w StartupInfo.hStdError = hStderr_w StartupInfo.dwFlags = win32process.STARTF_USESTDHANDLES # Mark doesn't support wShowWindow yet. # StartupInfo.dwFlags = StartupInfo.dwFlags | win32process.STARTF_USESHOWWINDOW # StartupInfo.wShowWindow = win32con.SW_HIDE # Create new output read handles and the input write handle. Set # the inheritance properties to FALSE. Otherwise, the child inherits # the these handles; resulting in non-closeable handles to the pipes # being created. pid = win32api.GetCurrentProcess() tmp = win32api.DuplicateHandle( pid, self.hStdin_w, pid, 0, 0, # non-inheritable!! win32con.DUPLICATE_SAME_ACCESS) # Close the inhertible version of the handle win32file.CloseHandle(self.hStdin_w) self.hStdin_w = tmp tmp = win32api.DuplicateHandle( pid, self.hStdout_r, pid, 0, 0, # non-inheritable! win32con.DUPLICATE_SAME_ACCESS) # Close the inhertible version of the handle win32file.CloseHandle(self.hStdout_r) self.hStdout_r = tmp tmp = win32api.DuplicateHandle( pid, self.hStderr_r, pid, 0, 0, # non-inheritable! win32con.DUPLICATE_SAME_ACCESS) # Close the inhertible version of the handle win32file.CloseHandle(self.hStderr_r) self.hStderr_r = tmp # start the process. print "creating process" cmdline = "%s %s" % (command, string.join(args, ' ')) hProcess, hThread, dwPid, dwTid = win32process.CreateProcess( None, # program cmdline,# command line None, # process security attributes None, # thread attributes 1, # inherit handles, or USESTDHANDLES won't work. # creation flags. Don't access the console. 0, # Don't need anything here. # If you're in a GUI app, you should use # CREATE_NEW_CONSOLE here, or any subprocesses # might fall victim to the problem described in: # KB article: Q156755, cmd.exe requires # an NT console in order to perform redirection.. environment, # new environment path, # new directory StartupInfo) # normally, we would save the pid etc. here... print "process created" # Child is launched. Close the parents copy of those pipe handles # that only the child should have open. # You need to make sure that no handles to the write end of the # output pipe are maintained in this process or else the pipe will # not close when the child process exits and the ReadFile will hang. win32file.CloseHandle(hStderr_w) win32file.CloseHandle(hStdout_w) win32file.CloseHandle(hStdin_r) self.outQueue = Queue.Queue() self.closed = 0 threading.Thread(target=self.doWrite).start() threading.Thread(target=self.doReadOut).start() threading.Thread(target=self.doReadErr).start() def write(self, data): """Write data to the process' stdin.""" self.outQueue.put(data) def closeStdin(self): """Close the process' stdin.""" self.outQueue.put(None) def connectionLost(self): """Will be called twice, by the stdout and stderr threads.""" if not self.closed: abstract.FileDescriptor.connectionLost(self) print "connection lost" self.closed = 1 self.closeStdin() win32file.CloseHandle(self.hStdout_r) win32file.CloseHandle(self.hStderr_r) def doWrite(self): """Runs in thread.""" while 1: data = self.outQueue.get() if data == None: break try: win32file.WriteFile(self.hStdin_w, data, None) except win32api.error: break win32file.CloseHandle(self.hStdin_w) def doReadOut(self): """Runs in thread.""" while 1: try: hr, data = win32file.ReadFile(self.hStdout_r, 8192, None) except win32api.error: task.schedule(self.connectionLost) return task.schedule(self.handleChunk, data) def doReadErr(self): """Runs in thread.""" while 1: try: hr, data = win32file.ReadFile(self.hStderr_r, 8192, None) except win32api.error: task.schedule(self.connectionLost) return task.schedule(self.handleError, data) if __name__ == '__main__': from twisted.internet import main def printer(x): print "Got", repr(x) exe = win32api.GetModuleFileName(0) print exe p = Process(exe, ['-u', 'processtest.py'], None, None) print "ok, made process object" p.handleChunk = printer p.handleError = printer p.write("hello, world") p.closeStdin() main.run()

2 5

[Twisted-Python] Commits list problems
by Itamar Shtull-Trauring 05 Mar '02

05 Mar '02

Commits that change stuff in the root aren't sent to the commits list. So if I made a change to the ChangeLog along with my change, like the good programmer I am, nothing goes out to the commit list. So, things that were lost - refactor of tap making APIs, and the fact that I checked in the win32 event loop. This is BAD. This is ANNOYING. Someone fix it.

1 0

[Twisted-Python] Web Widgets Examples
by cpaul＠telemetrybox.org 05 Mar '02

05 Mar '02

I was wondering if anybody on this list has an example of using Web Widgets to render an HTML page? Aloha, Charles

2 2

[Twisted-Python] Mime Types ins static.File
by cpaul＠telemetrybox.org 04 Mar '02

04 Mar '02

Aloha, Today I shut down Apache on my workstation and started using twisted.web on port 80 - everything is sailing smooth, I even have a startup script in rc.d. The only issue I am running into so far has to do with mime types. In static, mime types are defined by the dictionary File.contentTypes - Is there an elegant way to dynamically set the mime types at mktap time? Or would it be better to hack static.py to use Python's mimetypes module along with a common mime.types file? I am currently using: contentTypes = mimetypes.read_mime_types('/usr/pkg/etc/httpd/mime.types') for my default mime types dictionary (this mime.types is from Apache). This is obviously not a cross-platform solution. By default, a NetBSD machine does not come with a mime.types database, instead it has to be installed with Apache or Netscape. Would it make sense for Twisted to come with it's own mime.types file? Thanks, Charles

1 0

[Twisted-Python] Win32 events main loop
by Andrew Bennetts 04 Mar '02

04 Mar '02

Hi all, Here is the first *rough* cut of the Twisted main loop using Win32 events, based upon internet.poll. It seems to be okay for simpleserv.py, but I haven't tested it for anything else. I'll leave that to a day when I'm not feeling so ill... I pretty much guarantee it is mostly broken -- think of it as a proof of concept. I think if I experiment with MsgWaitForMultipleObjects instead of WaitForMultipleObjects, I can make it respond to Win32 window messages properly; e.g. Ctrl-C and stopping when running as a service might work nicely -- COM stuff would probably benefit too. Enjoy! -Andrew. --- win32.py --- # This library is free software; you can redistribute it and/or # modify it under the terms of version 2.1 of the GNU Lesser General Public # License as published by the Free Software Foundation. # # This library is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU # Lesser General Public License for more details. # # You should have received a copy of the GNU Lesser General Public # License along with this library; if not, write to the Free Software # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA """A win32event based implementation of the twisted main loop. To install the event loop (and you should do this before any connections, listeners or connectors are added): from twisted.internet import win32 win32.install() """ # Win32 imports from win32file import WSAEventSelect, FD_READ, FD_WRITE, FD_CLOSE, \ FD_ACCEPT, FD_CONNECT from win32event import CreateEvent, WaitForMultipleObjects, \ WAIT_OBJECT_0, WAIT_TIMEOUT, INFINITE # Twisted imports from twisted.python import log, threadable import main # globals reads = {} writes = {} events = {} def _addEvent(fd, why, events=events): print '_addEvent:', fd, why event = CreateEvent(None, 0, 0, None) WSAEventSelect(fd, event, why) events[event] = (fd, why) return event def addReader(reader, reads=reads): """Add a FileDescriptor for notification of data available to read. """ print 'addReader:', reader if not reads.has_key(reader): reads[reader] = _addEvent(reader, FD_READ|FD_ACCEPT|FD_CONNECT) def addWriter(writer, writes=writes): """Add a FileDescriptor for notification of data available to write. """ print 'addWriter:', writer if not writes.has_key(writer): writes[writer] =_addEvent(writer, FD_WRITE) def removeReader(reader): """Remove a Selectable for notification of data available to read. """ if reads.has_key(reader): del events[reads[reader]] del reads[reader] def removeWriter(writer, writes=writes): """Remove a Selectable for notification of data available to write. """ if writes.has_key(writer): del events[writes[writer]] del writes[writer] def removeAll(): """Remove all selectables, and return a list of them.""" result = reads.keys() + writes.keys() reads.clear() writes.clear() events.clear() return result def doWaitForMultipleEvents(timeout, reads=reads, writes=writes): if timeout is None: #timeout = INFINITE timeout = 5000 else: timeout = timeout * 1000 print 'timeout is:', timeout handles = events.keys() val = WaitForMultipleObjects(handles, 0, timeout) print 'WaitForMultipleObjects returned:', val if val == WAIT_TIMEOUT: return elif val >= WAIT_OBJECT_0 and val < WAIT_OBJECT_0 + len(handles): print 'Here' fd, why = events[handles[val - WAIT_OBJECT_0]] print fd, why log.logOwner.own(fd) try: if why & FD_READ|FD_ACCEPT|FD_CONNECT: fd.doRead() elif why == FD_WRITE: fd.doWrite() except: log.deferr() why = FD_CLOSE if why == FD_CLOSE: removeReader(fd) removeWriter(fd) try: fd.connectionLost() except: log.deferr() log.logOwner.disown(fd) def install(): """Install the poll()-based event loop.""" main.addReader = addReader main.addWriter = addWriter main.removeReader = removeReader main.removeWriter = removeWriter #main.doSelect = doPoll main.doSelect = doWaitForMultipleEvents main.removeAll = removeAll def initThreads(): """Do initialization for threads.""" if main.wakerInstalled: # make sure waker is registered with us removeReader(main.waker) addReader(main.waker) threadable.whenThreaded(initThreads) __all__ = ["install"]

2 2

[Twisted-Python] twistedmatrix client
by Kelly Roestel 03 Mar '02

03 Mar '02

I am new to python and twistedmatrix, so any help would be great. I have been able to write a server and connect to it via python sockets. But I would like to figure out how to create a twisted client. But, I have found no docs on creating clients. Is there some place that I can look for docs, or can some one help me with client setup. What I am passing to the client from the server is a simple list with four items. Thanks for the help -- Kelly Roestel Network Admin DolphinSearch, Inc

2 1

[Twisted-Python] Aloha, New Member
by cpaul＠telemetrybox.org 03 Mar '02

03 Mar '02

Aloha, My name is Charles Paul, and I am interested in learning more about how to use Twisted. Aloha, Charles

3 3

[Twisted-Python] A new testing strategy for protocols
by Itamar Shtull-Trauring 02 Mar '02

02 Mar '02

A long time issue we've had is how to test protocols under "real" circumstances. For DNS testing, I decided to do just that - see the code in twisted/test/test_names.py. Basically, I start a server listening using UDP, and have a client connect to it, all within the testing code and automatically. It works pretty well, after a bit of debugging. Data is pushed by calling main.iterate(). Now, in a lot of cases twisted.protocols.loopback may be good enough, but this approach is really necessary for thorough testing in certain cases. FTP leaps to mind, but also if we want automated testing of TOC or OSCAR clients against real servers. One drawback at least is that these tests will fail miserably on Jython (main.iterate on Jython doesn't push data), so I'm probably going to add code that makes sure they don't run at all on Jython. Another drawback is the related issue that I'm also testing DNS queries against real servers - this assumes a working net connection.

1 0

[Twisted-Python] Psyco is our friend
by Itamar Shtull-Trauring 02 Mar '02

02 Mar '02

Psyco == http://sf.net/projects/psyco/ So, I ran a Banana benchmark, attached. The results: Psyco on 1.8585100174 seconds (5380.65434483 messages a second) Now I edit the file and turn off psyco: Psyco off 4.81016397476 seconds (2078.93120743 messages a second) Nice, eh? import time, psyco from twisted.spread import banana PSYCO = 1 if PSYCO: psyco.bind(banana.encode) psyco.bind(banana.int2b128) psyco.bind(banana.b1282int) psyco.bind(banana.decode) psyco.bind(banana.Banana.dataReceived) psyco.bind(banana.Banana._encode) s = banana.encode([1, 2, "hello", "there"]) banana.decode(s) if PSYCO: print "Psyco on" else: print "Psyco off" # run the actual benchmark start = time.time() for i in xrange(10000): s = banana.encode([i, i*2, "hello", "there"]) banana.decode(s) elapsed = time.time() - start print elapsed, "seconds (%s messages a second)" % (10000 / elapsed)

1 0

[Twisted-Python] Unused variables in doSelect
by Andrew Bennetts 28 Feb '02

28 Feb '02

This is a minor thing, but... doSelect has the following comment (in 0.15.2): # Since this loop should really be as fast as possible, # I'm caching these global attributes so the interpreter # will hit them in the local namespace. reads=reads, writes=writes, rhk=reads.has_key, whk=writes.has_key): But rhk and whk are unused. Further on in the function, it does: for selectables, method, dict in ((r, "doRead", reads), (w,"doWrite", writes)): hkm = dict.has_key I suggest that either the rhk and whk variables are removed for clarity, or that that for loop becomes: for selectables, method, dict, hkm in ((r, "doRead", reads, rhk), (w,"doWrite", writes, whk)): Incidentally, the reason why I'm looking at doSelect in the first place is that something seems to have changed in 0.15.2 (since 0.15.0) that (on Windows at least) prevents Ctrl-C or Ctrl-Break from interrupting the process immediately -- it can take up to a minute for it to respond. I haven't yet figured out why, there's nothing obvious wrong. This also applies to stopping it when running as a Win NT service. On the other hand, it no longer constantly uses 1% of the cpu even when idle. I can reproduce this behaviour with simpleserv.py, so it's not my code causing it :) I wouldn't mind looking over the cvs history to look for relevant changes, but the CVSWeb link is missing from the new website. Regards, -Andrew.

3 2

[Twisted-Python] Twisted DNS issues
by Itamar Shtull-Trauring 28 Feb '02

28 Feb '02

<itamar> next, if you fail to connect to a DNS server, you get a traceback <itamar> something about passing extra args to connectionLost <moshez> itamar: yeah, I know. <moshez> itamar: ugh. <itamar> now, moving onwards <itamar> consider this code: <moshez> itamar: I didn't know about that <itamar> r = dns.ResolveConfResolver() <itamar> d = defer.Deferred().addCallback(printer).addErrback(printer) <itamar> d.arm() <itamar> r.resolve(d, "www.zoteca.com") <itamar> the result should be that printer() is based the IP, right? <itamar> but it doesn't <moshez> itamar: whatis it? <itamar> because in SentQuery.getAnswer, we do: <itamar> process = getattr(self, 'processAnswer_%d' % message.answers[0].type, None) <itamar> if process is None: <itamar> self.errback( <itamar> etc. <itamar> now, the first of the answers always seems to have type 5 <itamar> answers[1], 2, etc. seem to have the content <itamar> so it always fails <itamar> because you don't have processAnswer_5 <moshez> itamar: oh, I see. <itamar> conclusion: DNS needs a good accepttests suite

1 0