Mailman 3 September 2003 - 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] Re: [Twisted-commits] log stderr and non-zero exit code in CGIs, don't show info to users as it is a security risk (closes issue #241)
by Glyph Lefkowitz 31 Dec '03

31 Dec '03

On Thursday, August 28, 2003, at 10:32 AM, itamarst CVS wrote: > log stderr and non-zero exit code in CGIs, don't show info to users as > it is a security risk (closes issue #241) We shouldn't swallow errors in these situations. If it's a security risk, provide a way for the server administrator to turn it off, but this is a _bad_ default. If you doubt the wisdom of making this default, please consult any number of Perl FAQs of the form: Q. "I wrote a CGI and it works perfectly, but now I moved it to another server and I get nothing but a "500 Internal Server Error" page. How do I tell what went wrong!?!?!?" A. Look in your apache logs. --- Q. "I looked at my apache logs and nothing makes sense! How do I tell what the error was??!" A. ... Also, could you clarify the security risk of displaying stderr from CGI scripts? I've never heard of a CGI that puts security-critical information on stderr rather than stdout and makes it a risk to display to users.

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[Twisted-Python] callFromThread with return
by Egor Cheshkov 06 Oct '03

06 Oct '03

Hello! Suppose I run task in worker thread (e.g. database transaction) and I need to do some IO (PB call) and get the result from it during transaction. Since I run not in reactor's thread it's ok to block and wait for the result. I know that there is callFromThread but it never return any result. Is it possible to implement something like callFromThread that can block, wait for result and return it? Thanks in advance, Egor.

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[Twisted-Python] Serving web content over SSL
by Thomas Weholt 01 Oct '03

01 Oct '03

Can anybody provide a working, simple example of a SSL-capable web-server using Twisted ? Any hints or clues regarding installation of openssl or other required library is also interesting. Thanks in advance, Thomas

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by jv5Hivfj6183j4＠aonehotwebdeals.com 01 Oct '03

01 Oct '03

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[Twisted-Python] more on IRC frustration
by Glyph Lefkowitz 30 Sep '03

30 Sep '03

Mentioning IRC frustrations in my message to paul reminded me of something. There is one stylistic hint in particular I'd like to point out, because it causes the most misunderstanding, and it seems as though it may be particular to our peculiar IRC subculture. If you're in #twisted and somebody says something like this: <usr> Hi there! I am a user with a proble integrating widgets and frobules, and there seems to be a problem with version 2.5-X of Twisted. <dev> i guess you are just an idiot then! haha idiot Though I seriously doubt such a straightforwardly hostile exchange would occur, watch the punctuation in the #twisted regular's phrase. If it follows the pattern <dev> sentence with no punctuation! additional sentence it is most likely intended as sarcasm, whereas if it is phrased with mroe conventional grammar and punctuation, <dev> I guess you're just an idiot, then. Heh. Idiot. Then you should really be offended :-). Other cues of sarcasm include use of the word "r" (for "are"), "si" (for "is"), and "teh" (for "the") We rarely make those typos unintentionally.

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[Twisted-Python] secsh, please compare with conch
by Tommi Virtanen 30 Sep '03

30 Sep '03

Hi. I hate duplicated effort (that has not real reason to be duplicated), and noticed this: http://www.lag.net/~robey/secsh/ secsh is a module for python 2.3 that implements the SSH2 protocol for secure (encrypted and authenticated) connections to remote machines. unlike SSL (aka TLS), SSH2 protocol does not require heirarchical certificates signed by a powerful central authority. you may know SSH2 as the protocol that replaced telnet and rsh for secure access to remote shells, but the protocol also includes the ability to open arbitrary channels to remote services across the encrypted tunnel (this is how sftp works, for example). the module works by taking a socket-like object that you pass in, negotiating with the remote server, authenticating (using a password or a given private key), and opening flow-controled "channels" to the server, which are returned as socket-like objects. you are responsible for verifying that the server's host key is the one you expected to see, and you have control over which kinds of encryption or hashing you prefer (if you care), but all of the heavy lifting is done by the secsh module. it is written entirely in python (no C or platform-dependent code) and is released under the GNU LGPL (lesser GPL). Could the conch guy please email the author of secsh and see whether they could unite their efforts? Please? Thank you.

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[Twisted-Python] using ClientFactory from within a server
by Greg 30 Sep '03

30 Sep '03

I am having trouble using ClientFactory to communicate from within a server. Specifically, I can't figure out the proper way to exit from the client process. Included is some example code illustrating the problem I am having. It is the simple echo server example, but when someone sends some text to the server, I am trying to talk to an SMTP server to send an email. This is just an example (there are probably better ways to fire off an email), but you get the idea. The client code never "exits" and if I try to use reactor.stop() it causes a traceback. So how do I properly exit from this client code, or (being new to twisted) am I going about this in the entirely wrong way? Thanks. #!/usr/bin/env python from twisted.internet import reactor from twisted.internet.protocol import Protocol, ClientFactory, ServerFactory import sys class Echo(Protocol): """This is just about the simplest possible protocol""" def dataReceived(self, data): "As soon as any data is received, write it back." self.transport.write(data) factory2 = MySMTPClientFactory() host = 'localhost' port = 25 reactor.connectTCP(host, port, factory2) reactor.run() print "Returned from sending email" # ^ Never gets to this point class MySMTP(Protocol): def dataReceived(self, data): sys.stdout.write('Server said: ' + data) if data[:3] == "220": self.transport.write("helo foo.com\n") self.stage = 1 if data[:3] == "250": if self.stage == 1: self.transport.write("MAIL FROM:<greg(a)foo.com>\n") self.stage = 2 elif self.stage == 2: self.transport.write("RCPT TO:<greg(a)foo.com>\n") self.stage = 3 elif self.stage == 3: self.transport.write("DATA\n") self.stage = 4 elif self.stage == 4: self.transport.write("QUIT\n") self.transport.loseConnection() #reactor.stop() # ^ This causes a traceback if data[:3] == "354": # Ready to send actual email self.transport.write("This is a test email\n.\n") class MySMTPClientFactory(ClientFactory): def startedConnection(self, connector): print 'Started to connect.' def buildProtocol(self, addr): print 'Connected.' return MySMTP() def clientConnectionLost(self, connector, reason): print 'Lost connection. Reason:', reason #reactor.stop() # ^ Causes a traceback here too def clientConnectionFailed(self, connector, reason): print 'Connection failed. Reason:', reason def main(): """This runs the protocol on port 8000""" factory = ServerFactory() factory.protocol = Echo reactor.listenTCP(8000,factory) reactor.run() # this only runs if the module was *not* imported if __name__ == '__main__': main()

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[Twisted-Python] deferred folies
by Federico Di Gregorio 30 Sep '03

30 Sep '03

hi *, lately i did some dirty Deferred tricks and i just want to know if there is a better way to do what i did. the situation is as follows: a server exposes through pb a "session" object. the client can call on that object "execute" (any number of times) and then "abort" or "end" to end the session. the session is created by calling "new_session" on the remote perspective (after authentication, etc.) now, for a simple get session/execute/end sequence i don't want to write n+1 callbacks (one that waits for new_session and call execute, next one that wait on execute and call next, etc.) so here is what I did (inside a mixin class used in the client): def session(self): return self.server.callRemote("new_session") def execute(self, trans, *args, **kwargs) cb = kwargs.get('callback', None) if self._session: dfr = self.server.callRemote(trans, *args) if cb: dfr.chainDeferred(cb) return dfr else: dfr = self.session() cb = Deferred() dfr.addCallback(self._execute_got_session, trans, cb, *args) return cb def _execute_got_session(self, session, trans, cb, *args): self._session = session return self.execute(trans, *args, callback=cb) that is, from the client the user can just do: d = self.execute("set-foo", 42) d.addCallback(...) and in the callback call .execute again (and be sure to be in the same session) or call end or abort to terminate the session. clear? mm.. what i want to know is if the "cb" trick and chainDeferred call are a dirty hack or if that's the way they are supposed to be used and if there is a better way to do what i do. ciao, federico -- Federico Di Gregorio Debian GNU/Linux Developer fog(a)debian.org INIT.D Developer fog(a)initd.org Lasciate che i furetti vengano a me. -- Maria Luisa Benedetta Panzani

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[Twisted-Python] Re: serving dynamic on root and still serve static somehow
by ccom＠gmx.net 30 Sep '03

30 Sep '03

> With isLeaf=False, the root resource will _never_ have its > render() method called. That is because the request for > the root resource is always '/', not ''. > (i.e., "GET / HTTP/1.1", not "GET HTTP/1.1") > '/'.split('/') == [''], which means that getChild('', request) will > be called. Therefore, your root resource must respond to > getChild('', request). This is so tricky. Your suggestion does not work because I want to pass a parameter for the dynamic page which I read out with request.postpath[0]. You know what would solve my problem really quickly: If I would know how to call a child manually (or not even a child but the static.File('.') resource). I have come up with the following code but it does throw me a " does not return a string" error: class Container(resource.Resource): isLeaf = True def render(self, request): if request.postpath[0] == 'static': return self.getChild('static', request) else: return doContainer(request) root = Container() root.putChild('static', static.File('.')) site = server.Site(root) reactor.listenTCP(8080, site) reactor.run() _stephan -- NEU FÜR ALLE - GMX MediaCenter - für Fotos, Musik, Dateien... Fotoalbum, File Sharing, MMS, Multimedia-Gruß, GMX FotoService Jetzt kostenlos anmelden unter http://www.gmx.net +++ GMX - die erste Adresse für Mail, Message, More! +++

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