Mailman 3 February 2003 - Twisted

[Twisted-Python] t.i.tcp bug -- a possible fix
by Moshe Zadka Feb. 20, 2003

Feb. 20, 2003

Index: twisted/internet/tcp.py =================================================================== RCS file: /cvs/Twisted/twisted/internet/tcp.py,v retrieving revision 1.108 diff -u -r1.108 tcp.py --- twisted/internet/tcp.py 19 Feb 2003 07:18:29 -0000 1.108 +++ twisted/internet/tcp.py 20 Feb 2003 00:55:28 -0000 @@ -283,7 +283,8 @@ skt = self.createInternetSocket() except socket.error, se: err = error.ConnectBindError(se[0], se[1]) - whenDone = None + self.connector.connectionFailed(failure.Failure(err)) + return if whenDone and bindAddress is not None: try: skt.bind(bindAddress) Without this patch, skt is unbound if the except was triggered. A few lines later, "skt" is used, prompting an UnboundLocalVariable exception. This might not be the correct patch, but it does appear to solve stuff... -- Moshe Zadka -- http://moshez.org/ Buffy: I don't like you hanging out with someone that... short. Riley: Yeah, a lot of young people nowadays are experimenting with shortness.

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[Twisted-Python] Re: IRCClient
by Kevin Turner Feb. 20, 2003

Feb. 20, 2003

(I'm sending this to the Twisted list, please feel free to follow-up there.) On Tue, 2003-02-18 at 12:33, Konrad Rokicki wrote: > I just started working with the IRCClient class (twisted.protocols.irc) > and unless I'm mistaken, it is missing some features like a userQuit event > and handling of NAMREPLY (for getting a list of users in a channel). > I was wondering if this module is still being actively developed and if I > should submit patches to do those sorts of things. What would you have them do? The protocol does not dictate any response to these messages, and protocols.irc.IRCClient is intended to be an implementation of just the IRC client protocol. The class is designed to be extensible so its users can subclass it and define their own irc_QUIT and irc_RPL_NAMREPLY methods. The decision of what to do when you receive such a message is up to the application, I think. Really, the interface involving NAMREPLY should look more like "group.getMembers() returns a Deferred list of Persons," which doesn't go in the wire-level twisted.protocols package. Development of high-level interfaces for chat clients is happening in twisted.im; currently with support for IRC, twisted.words, and TOC (and OSCAR and MSN any moment now, right guys?). That said, twisted.im is a pretty scary place right now: there are things not covered by the interface, the implementation is a bit of a mess, there's no test coverage, and it's rather unstable as I have to go in there and mess around with things whenever I discover that what I was trying to do with it just wasn't possible. So, I'd understand if you decide to stick with extending IRCClient instead, but twisted.im is where we're really looking to develop an interface for chat clients (both user-interactive and autonomous), and it could use a few more user-developers (not to mention a loving maintainer) to help define its needs. Regards, - Kevin Turner, reluctant maintainer of twisted.protocols.irc -- The moon is waning gibbous, 96.5% illuminated, 16.5 days old.

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[Twisted-Python] Someone broke my precious code!
by Itamar Shtull-Trauring Feb. 19, 2003

Feb. 19, 2003

The latest patch to process.py broke process running on Windows. This is bad. Twisted should not be released until the tests are run with the win32event reactor! -- Itamar Shtull-Trauring http://itamarst.org/ http://www.zoteca.com -- Python & Twisted consulting ***> Stop the war: http://unitedforpeace.org/ <***

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[Twisted-Python] quoting strings in db transactions
by Federico Di Gregorio Feb. 19, 2003

Feb. 19, 2003

hi *, i'm going through the twisted.enterprise python code and i find almost everywhere commens as: safe(text) Make a string safe to include in an SQL statement or escape_string(self, text) Escape a string for use in an SQL statement. imho, this is plain wrong. twisted uses dbapi compliant adapters and they *should* provide safe argument quoting (as per DBAPI-2.0.) it is almost impossible to manage the quoting the right way for every db adapter, but it is possible to call the driver the right way and let it do the quoting. or did i missed something? also, how much mature is the enterprise code? it is a stable API or there is space for contributions? -- Federico Di Gregorio Debian GNU/Linux Developer fog(a)debian.org INIT.D Developer fog(a)initd.org Mi piace schioccare la lingua fortemente. -- Maria Luisa Benedetta Panzani

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[Twisted-Python] Trying to figure out twisted.web
by Abe Fettig Feb. 19, 2003

Feb. 19, 2003

Hi all, This weekend I started playing around with twisted.web, and I'm really impressed. This is great stuff. I'd like to port the web interface for Hep over to twisted.web (the current version uses twisted.protocols.http only), but I'm having trouble figuring out the best way to accomplish what I want. So far I've set up a server that processes .epy files using twisted.web.script.PythonScript. This would be fine, except that it doesn't seem to let me do asynchronous things - I can start a deferred, and set the callback to request.write(something), but then it never gets called. twisted.web.widgets looked like the logical place to go next, but then http://twistedmatrix.com/documents/howto/widgets says that widgets are depriciated in favor of Woven. But Woven is kind of a lot to get my head around at the moment, and it looks like I'd have to rewrite all my code to use it. Is that really the only solution? If so, is there an example of a woven page that runs a deferred function and then writes some output when it gets a callback? Also, I'm having trouble with twisted.web.static.Registry. All I want to is make a set of objects available to all the pages in my site. I don't understand how a Registry object uses interfaces, or even why its neccessary to use interfaces at all. Is there a way to access objects in the registry by name? Some sample code would helpe me here, too. Thanks! -- Abe Fettig <abe(a)fettig.net>

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Re: [Twisted-Python] Basic HTTP Authentication in Twisted.web
by Allen Chan Feb. 19, 2003

Feb. 19, 2003

The following test.rpy works for me in MSIE: from twisted.protocols import http from twisted.web import resource,error class AuthResource(resource.Resource): def __init__(self): resource.Resource.__init__(self) def render(self, request): if not request.getUser() or not request.getPassword(): request.setHeader('WWW-authenticate', 'Basic realm="%s"' % ("default")) errpage = error.ErrorPage(http.UNAUTHORIZED,"Unauthorized","401 Authentication required") return errpage.render(request) else: return "<html><head></head><body>Hello World</body></html>\n" resource = AuthResource() -----Original Message----- >From: "Thomas Weholt" <2002(a)weholt.org> >To: <twisted-python(a)twistedmatrix.com> >Subject: Re: [Twisted-Python] Basic HTTP Authentication in Twisted.web >Date: Wed, 19 Feb 2003 00:07:05 +0100 >Reply-To: twisted-python(a)twistedmatrix.com > >Thanks for the tip. > >Changed the code to use the same content for both the body and the >Content-Length-header. Still no go. Isn't there a special Twisted way of >doing this? My curreny solution is as I said earlier a dirty hack based on >code from BaseHTTPServer. > >Anybody else has this kind of authentication going in their application who >can spare a few lines of code as an example ??? > >Thomas

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[Twisted-Python] Conch traceback
by Jp Calderone Feb. 19, 2003

Feb. 19, 2003

When starting multiple conch sessions, those started after the first give: exarkun:~$ !conch conch twistedmatrix.com exarkun(a)twistedmatrix.com's password: Traceback (most recent call last): File "/usr/local/bin/conch", line 32, in ? run() File "/home/exarkun/projects/python/Twisted/twisted/scripts/conch.py", line 170, in run reactor.run() File "/home/exarkun/projects/python/Twisted/twisted/internet/default.py", line 113, in run self.mainLoop() File "/home/exarkun/projects/python/Twisted/twisted/internet/default.py", line 124, in mainLoop self.doIteration(t) --- <exception caught here> --- File "/home/exarkun/projects/python/Twisted/twisted/internet/default.py", line 450, in doSelect why = getattr(selectable, method)() File "/home/exarkun/projects/python/Twisted/twisted/internet/tcp.py", line 105, in doRead return self.protocol.dataReceived(data) File "/home/exarkun/projects/python/Twisted/twisted/conch/ssh/transport.py", line 197, in dataReceived self.service.packetReceived(ord(packet[0]), packet[1:]) File "/home/exarkun/projects/python/Twisted/twisted/conch/ssh/service.py", line 51, in packetReceived f(packet) File "/home/exarkun/projects/python/Twisted/twisted/conch/ssh/userauth.py", line 231, in ssh_USERAUTH_SUCCESS self.transport.setService(self.instance) File "/home/exarkun/projects/python/Twisted/twisted/conch/ssh/transport.py", line 227, in setService self.service.serviceStarted() File "/home/exarkun/projects/python/Twisted/twisted/scripts/conch.py", line 620, in serviceStarted onConnect() File "/home/exarkun/projects/python/Twisted/twisted/scripts/conch.py", line 206, in onConnect reactor.listenUNIX(filename, SSHUnixServerFactory()).numberAccepts = 1 File "/home/exarkun/projects/python/Twisted/twisted/internet/default.py", line 223, in listenUNIX p.startListening() File "/home/exarkun/projects/python/Twisted/twisted/internet/unix.py", line 70, in startListening raise CannotListenError, (None, self.port, le) twisted.internet.error.CannotListenError: Couldn't listen on any:/home/exarkun/.conch-exarkun-twistedmatrix.com-22: (98, 'Address already in use') Traceback (most recent call last): File "/usr/local/bin/conch", line 32, in ? run() File "/home/exarkun/projects/python/Twisted/twisted/scripts/conch.py", line 170, in run reactor.run() File "/home/exarkun/projects/python/Twisted/twisted/internet/default.py", line 113, in run self.mainLoop() --- <exception caught here> --- File "/home/exarkun/projects/python/Twisted/twisted/internet/default.py", line 124, in mainLoop self.doIteration(t) File "/home/exarkun/projects/python/Twisted/twisted/internet/default.py", line 457, in doSelect log.deferr() File "/home/exarkun/projects/python/Twisted/twisted/internet/default.py", line 450, in doSelect why = getattr(selectable, method)() File "/home/exarkun/projects/python/Twisted/twisted/internet/tcp.py", line 105, in doRead return self.protocol.dataReceived(data) File "/home/exarkun/projects/python/Twisted/twisted/conch/ssh/transport.py", line 197, in dataReceived self.service.packetReceived(ord(packet[0]), packet[1:]) File "/home/exarkun/projects/python/Twisted/twisted/conch/ssh/service.py", line 51, in packetReceived f(packet) File "/home/exarkun/projects/python/Twisted/twisted/conch/ssh/userauth.py", line 231, in ssh_USERAUTH_SUCCESS self.transport.setService(self.instance) File "/home/exarkun/projects/python/Twisted/twisted/conch/ssh/transport.py", line 227, in setService self.service.serviceStarted() File "/home/exarkun/projects/python/Twisted/twisted/scripts/conch.py", line 620, in serviceStarted onConnect() File "/home/exarkun/projects/python/Twisted/twisted/scripts/conch.py", line 206, in onConnect reactor.listenUNIX(filename, SSHUnixServerFactory()).numberAccepts = 1 File "/home/exarkun/projects/python/Twisted/twisted/internet/default.py", line 223, in listenUNIX p.startListening() File "/home/exarkun/projects/python/Twisted/twisted/internet/unix.py", line 70, in startListening raise CannotListenError, (None, self.port, le) twisted.internet.error.CannotListenError: Couldn't listen on any:/home/exarkun/.conch-exarkun-twistedmatrix.com-22: (98, 'Address already in use') Traceback (most recent call last): File "/usr/local/bin/conch", line 32, in ? run() File "/home/exarkun/projects/python/Twisted/twisted/scripts/conch.py", line 170, in run reactor.run() File "/home/exarkun/projects/python/Twisted/twisted/internet/default.py", line 113, in run self.mainLoop() File "/home/exarkun/projects/python/Twisted/twisted/internet/default.py", line 127, in mainLoop log.deferr() File "/home/exarkun/projects/python/Twisted/twisted/internet/default.py", line 124, in mainLoop self.doIteration(t) File "/home/exarkun/projects/python/Twisted/twisted/internet/default.py", line 457, in doSelect log.deferr() File "/home/exarkun/projects/python/Twisted/twisted/internet/default.py", line 450, in doSelect why = getattr(selectable, method)() File "/home/exarkun/projects/python/Twisted/twisted/internet/tcp.py", line 105, in doRead return self.protocol.dataReceived(data) File "/home/exarkun/projects/python/Twisted/twisted/conch/ssh/transport.py", line 197, in dataReceived self.service.packetReceived(ord(packet[0]), packet[1:]) File "/home/exarkun/projects/python/Twisted/twisted/conch/ssh/service.py", line 51, in packetReceived f(packet) File "/home/exarkun/projects/python/Twisted/twisted/conch/ssh/userauth.py", line 231, in ssh_USERAUTH_SUCCESS self.transport.setService(self.instance) File "/home/exarkun/projects/python/Twisted/twisted/conch/ssh/transport.py", line 227, in setService self.service.serviceStarted() File "/home/exarkun/projects/python/Twisted/twisted/scripts/conch.py", line 620, in serviceStarted onConnect() File "/home/exarkun/projects/python/Twisted/twisted/scripts/conch.py", line 206, in onConnect reactor.listenUNIX(filename, SSHUnixServerFactory()).numberAccepts = 1 File "/home/exarkun/projects/python/Twisted/twisted/internet/default.py", line 223, in listenUNIX p.startListening() File "/home/exarkun/projects/python/Twisted/twisted/internet/unix.py", line 70, in startListening raise CannotListenError, (None, self.port, le) twisted.internet.error.CannotListenError: Couldn't listen on any:/home/exarkun/.conch-exarkun-twistedmatrix.com-22: (98, 'Address already in use') Jp -- http://catandgirl.com/view.cgi?44 -- up 10 days, 4:28, 4 users, load average: 0.08, 0.07, 0.03

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[Twisted-Python] Using IConnector
by Dmitry Litovchenko Feb. 19, 2003

Feb. 19, 2003

I certainly need a brief sample of how to use reactor.connectWith and how to set up Protocol so that it correctly switches to another Protocol and initializes it. Example with: self.__class__ = anotherProto.__class__ self.connectionMade() is good but not enough. Constructor must be called at least and parameters should be passed to it. If I solve this problem in my way this may be incompatible with the whole Twisted ideology, which I currently don't know well. But I need to know the right way because I intend to create SOCKS 4, 5 and HTTP tunnel modules not for my use only but to contribute to Twisted. Please advise, I don't want to produce working code that works for me only while violating ten tons of Twisted conventions that are undocumented and invisible for me. -- Best regards, Dmitry mailto:kwaker@uch.net

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[Twisted-Python] TLS support for twisted (PATCH)
by Skinny Puppy Feb. 19, 2003

Feb. 19, 2003

Attached is the patch for TLS support within twisted. It is not the best code, but it passes all the SSL test (None working on that next) and works. The diff also adds an echoclient_tls.py/echoserv_tls.py, that work along with the echoclient_ssl.py/echoserv_tls.py Some things I did have questions about how best to handle: - What error should starttls raise if OpenSSL is not installed? exarkun suggested the following but I have no idea how to do it cleanly. Any ideas? exarkun : currently, connect/listenSSL aren't defined at all if the ssl support libs can't be implemented exarkun : might it make sense to just duplicate that? - the doRead_TLS/doRead_NOTLS and writeSomeData_TLS/writeSomeData_NOTLS are just damn ugly and could be combined but I felt it was best to leave the apart for now. Is OK, should I merge them? Jeremy Rossi

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[Twisted-Python] Basic HTTP Authentication in Twisted.web
by Thomas Weholt Feb. 18, 2003

Feb. 18, 2003

I need to authenticate users using basic HTTP authentication and the code below works on Mozilla, Opera, that awful KDE browser ;-) and whatever else I throw at it, EXCEPT MSIE. Most of my potential users are MS IE addicts so this is a key point in my project. The code below are ported from a previous project based on BaseHTTPServer. It might be that I didn't send a end_headers-header before sending the plain-text content. This was done in the BaseHTTPServer-solution, but I didn't find any such code in Twisted. def render(self, request): username = request.getUser() password = request.getPassword() if not username or not password: request.setResponseCode(401, 'Authentication needed') request.setHeader('Connection', 'close') request.setHeader('WWW-Authenticate', 'Basic realm="%s"' % 'default') request.setHeader('Content-Length', str(len('401: Authorization needed.'))) request.setHeader('Content-Type', 'text/html') return '<h1>401 Authentication required</h1>%s' % msg # else process the request in a normal way How can I use Twisted to authenticate users using basic HTTP authentication? Are there any example on how to use the cred-module in Twisted to authenticate users? Any information on this issue would be highly appreciated. Ideas on how to maintain user-information and implement security policies in Twisted, especially web-based Twisted-apps are also very interesting. Best regards, Thomas Weholt

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