Mailman 3 June 2002 - Twisted

[Twisted-Python] no 'headers' in server.Request instance problem
by Jon Dyte June 13, 2002

June 13, 2002

with mozilla build Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.8) Gecko/20020206,build 2002020615 sending a request to a quixote/twisted server (actually a modified Andrew Kuchling Example), I get the following error Installing SelectReactor, since unspecified. __main__.QuixoteFactory starting on 8098 Traceback (most recent call last): File "/sw/release/python/lib/python2.2/site-packages/twisted/internet/default.py", line 347, in doSelect why = getattr(selectable, method)() File "/sw/release/python/lib/python2.2/site-packages/twisted/internet/tcp.py", line 93, in doRead return self.protocol.dataReceived(data) File "/sw/release/python/lib/python2.2/site-packages/twisted/protocols/basic.py", line 161, in dataReceived self.lineReceived(line) File "/sw/release/python/lib/python2.2/site-packages/twisted/protocols/http.py", line 684, in lineReceived self.allHeadersReceived() File "/sw/release/python/lib/python2.2/site-packages/twisted/protocols/http.py", line 733, in allHeadersReceived self.persistent = self.checkPersistence(req, self.__version) File "/sw/release/python/lib/python2.2/site-packages/twisted/protocols/http.py", line 759, in checkPersistence request.setHeader('connection', 'close') File "/sw/release/python/lib/python2.2/site-packages/twisted/protocols/http.py", line 561, in setHeader self.headers[string.lower(k)] = v exceptions.AttributeError: QuixoteTWRequest instance has no attribute 'headers' The object QuixoteTWRequest is defined class QuixoteTWRequest (server.Request): ...... it looks to me like on some execution path thru http.py (dataReceived, lineReceived) etc etc the headers slot of the server.Request object doesnt get set. which would appear to mean requestReceived has not been called as this sets self.headers to an empty dict at least. The headers sent by the browser are :- Host: localhost:9999 User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.8) Gecko/20020206 Accept: text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,video/x-mng,image/png,image/jpeg,image/gif;q=0.2,text/css,*/*;q=0.1 Accept-Language: en-us Accept-Encoding: gzip, deflate, compress;q=0.9 Accept-Charset: ISO-8859-1, utf-8;q=0.66, *;q=0.66 Connection: close localhost.localdomain - - [12/Jun/2002 21:40:50] "GET / HTTP/1.1" 200 - I'm pretty new to Twisted, so I might be missing something here, but the script works with lynx and netscape 4.76. Jon

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[Twisted-Python] Using Twisted for a clustering library.
by Patrick B. Day June 12, 2002

June 12, 2002

I've been working on a cluster library for MOSIX and I've noticed that parts could possibly be replaced with some Twisted stuff. Briefly what I need to be able to do is the following: o Have the server spawn off client processes and communicates with them using IPC. o The client process waits for a task to arrive from the server and replies back to the server with the results of the complete task. o The server sends tasks to available clients then waits for a client to repond, sends the now idle client the next task and finally handles the response. After browsing through the Twisted source, I'm guessing that I'll need to write my own Reactor, Protocol, Factory, Application classes and possibly a new main module. Does this sound about right or am I over complicating things? Thanks for your help. ============================ Patrick Day uf069(a)freenet.victoria.bc.ca

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[Twisted-Python] Twisted 0.18.0rc2
by Christopher Armstrong June 11, 2002

June 11, 2002

There were a few bugs found in Twisted 0.18.0rc1 -- problems with redirection in static (--path) webservers, some XML-dependancies, and missing plugins for the TCP port forwarder. If there are no more bugs found for a bit, then 0.18.0rc2 will be released as 0.18.0. Thanks for the help, Twisted 0.18.0 is shaping up to be a *solid* release. It feels good to put out stable software. ;-) -- Chris Armstrong << radix(a)twistedmatrix.com >> http://twistedmatrix.com/users/carmstro.twistd/

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[Twisted-Python] idea for file transfers over PB
by Paul Boehm June 10, 2002

June 10, 2002

suggestion: transfer metainformation about file objects over PB, and create wrapper instances on the receiving end. so remotefile.read() executes on the remote perspective. any arguments for/against this? feasible? i'll struggle with the source a little, but i doubt my current python/twisted skills suffice to make this work. paul

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[Twisted-Python] Arms Crisis
by Glyph Lefkowitz June 10, 2002

June 10, 2002

Anyone who has programmed in depth with Twisted probably know about arm()ing deferreds by now. Nobody has complained as loudly as I thought they would, so I'm not sure if this is really that big of a problem, but I'm questioning my original design decisions regarding .arm(). Originally, I wanted it to be easily determineable whether your callback would be called before your stack had been escaped; so the system you returned your Deferred to would .arm() it afterwards. However, this creates lots of weird, confusing corners for callbacks to get lost in, and I have yet to see a situation where it actually matters whether your current stack frame is escaped before the callback happens. I would like to propose that we create an experimental mode where .arm() be made to do nothing (for backwards compatibility), and that .callback() call whatever callbacks are available immediately; and .addCallbacks() (and friends) will immediately call any pending callbacks. If after an extended period of testing it is discovered that there are no bugs created with this approach, we should remove .arm() entirely. I'd like some feedback on this, though. Does anyone else think that callbacks sometimes happening and sometimes not when .addCallbacks() is called makes a difference? Anyone feel strongly that .arm() is confusing and unnecessary? -- | <`'> | Glyph Lefkowitz: Travelling Sorcerer | | < _/ > | Lead Developer, the Twisted project | | < ___/ > | http://www.twistedmatrix.com |

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[Twisted-Python] latest release & solaris
by Jon Dyte June 8, 2002

June 8, 2002

Hi just a couple of notes of about the latest release 1) the tarball (gz) for unix seems to have some funny permissions/symlinks/umask? in it. This barfed using solaris tar, with an error about not being able to create the file, so I downloaded the windows version and unzipped that instead, and chmod -R to something sensible. 2) the C extension module cBanana.c actually has some C++ style comments in it. I think this is fine for gcc, but solaris' cc compiler is less forgiving. I just edited the file. other than those two gotchas, it seems to work. thanks Jon

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[Twisted-Python] APIs changes for TCP and UDP
by Itamar Shtull-Trauring June 5, 2002

June 5, 2002

1) Client TCP connects should be allowed to bind to a specific interface and port, e.g.: reactor.clientTCP('example.com', 80, p, bindAddress=('1.2.3.4', 999)) 2) UDP Ports's API should be formalized. Basically, the way UDP works from what I can see is that you create a Port, and for client connections you call the Port's createConnection(addr) method. Currently this returns a transport which is hooked up to a protocol, which is silly, it should return the protocol instance it contructs: port = reactor.listenUDP(8080, dnsFactory) clientProtocol = port.createConnection(("example.com", 53)) clientProtocol.query("....")

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[Twisted-Python] FTPResource, again
by Benjamin Bruheim June 4, 2002

June 4, 2002

Hey, Here are a draft for "Resources". This one follows Itamars suggestion (which I after some dispute with myself found necessary). The path-stuff is awful, so ignore it. A combination of the module posixpath (undocumented) and os.path is a good replacement. Otherwise, there's some random routines, and the Interfaces aren't specified. Any ideas what must in and what must go? Request.render is silly :) This is just a "proof of concept", but I fear I've done some fundemental errors. Especially the "resolving" of objects is idiotic and naive. Any suggestions for replacements? Anyway, I think this is enough code to make the ftp-server resourceindependent once and for all. Oh, and last there's some unused code there too, but please don't mind. \\ benjamin

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[Twisted-Python] irc bug report reminders (Twisted-0.18.0)
by Paul Boehm June 4, 2002

June 4, 2002

#1: File "/usr/lib/python2.2/site-packages/twisted/internet/app.py", line 430, in run reactor.listenUDP(port, factory, interface, maxPacketSize) File "/usr/lib/python2.2/site-packages/twisted/internet/default.py", line 120, in listenUDP return udp.Port(self, port, factory, interface, maxPacketSize) TypeError: __init__() takes at most 5 arguments (6 given) #2: 16:08 < typo_> hmm, is app.listenSSL currently "temporarily unimplemented" because of the reactor transition ? 16:08 < itamar> apparently 16:08 < itamar> that's a bug though 16:08 < radix> eep 16:09 < itamar> or maybe glyph didn't feel like making a custom XML format for that 16:09 < itamar> god that sucks 16:09 < itamar> anyway, do reactor.listenSSL, it'll be sorted out by next release I hope

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[Twisted-Python] ANN: Twisted 0.18.0
by Itamar Shtull-Trauring June 2, 2002

June 2, 2002

Twisted is an event-based framework for internet applications, written in Python and licensed under the LGPL. For more information, visit: http://www.twistedmatrix.com or join the list at: http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python What's New since 0.17.4 ======================= 0.18.0 is a major release, cleaning up many of the main APIs in twisted.internet and moving us much closer to a 0.99.x series leading up to Twisted 1.0. - The networking core of Twisted - twisted.internet - was totally refactored, cleaned up, documented and improved, using explicit interfaces. The API is now much improved, and mostly stable. The main change was to create an explicit reactor object, using which you can schedule events, connect or listen on TCP/UDP/SSL ports, run methods in a thread pool, and so on. The tools that come with Twisted have been extended to allow choosing the reactor at runtime. Currently supported are select(), poll(), GTK+, Qt, Win32 event API, and Java thread based reactors, with wxPython and Tkinter support integrating with whichever reactor is chosen. - Perspective Broker, Twisted's remote object protocol, now supports returning the equivalent of exceptions for failed remote method calls. Additionally, resource limiting was added to the implementation. - Applications can now be persisted to XML, using marmalade, a XML pickle equivalent. This allows you to edit low level application settings using a text editor. - Added a sample IRC bot - it listens on a channel and logs it to a file. - Improvements to twisted.mail - the SMTP server now has basic support for bouncing. - Improvements to t-im, Twisted's instant messaging client. - LDAP was moved out into a separate package: http://twistedmatrix.com/users/tv/ldaptor/ - Many bug fixes, feature enhancements and additional documentatiom. What is Twisted? ================ Twisted is an event-based framework for internet applications. It includes a web server, a telnet server, a chat server, a news server, a generic client and server for remote object access, and APIs for creating new protocols and services. Twisted supports integration of the Tk, GTK+, Qt or wxPython event loop with its main event loop. The Win32 event loop is also supported, as is basic support for running servers on top of Jython. Twisted currently supports the following protocols, all implemented in pure python, most of them as both servers and clients: - NNTP - FTP - HTTP - SOCKSv4 - SMTP - IRC - telnet - POP3 - AOL's instant messaging TOC - OSCAR, used by AOL-IM as well as ICQ (client only) - DNS - finger - Echo, discard, chargen and friends - Twisted Perspective Broker For more information, visit http://www.twistedmatrix.com, or join the list at http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python

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