Mailman 3 July 2006 - Twisted

[Twisted-Python] SSH Forwading and Database Queries in same application
by Kevin Klues 13 Jul '06

13 Jul '06

I am trying to use twisted.conch.ssh to write an application that first sets up an ssh connection that forwards port 5432 from an external server to my local machine and then locally connect to a database running on the server using that port. I am able to write two separate applications that accomplish what I want, but I am unable to integrate them into one. Using the two application approach, I can first start the application that sets up my port forwarding and then start the application that connects to my database. I can then make queries using the second application and everything seems to work just fine. When integrating them into one application I am still able to connect to the database, but I cannot run any queries over it. The queries hang indefinitely, and neither my callback nor my errback functions that should run after the query has completed ever get called. My setup for implementing this is as follows.... I have introduced a deferred when setting up my port forwarding that gets its callback only once the startFactory() event gets called for my class derived from forwarding.SSHListenForwardingFactory. The forwarding is setup using the following code snippet..... reactor.listenTCP(PORT, DatabaseForwardingFactory(self.conn, (LOCALHOST, PORT), DatabaseClientForwardingChannel)) where.... class DatabaseForwardingFactory(forwarding.SSHListenForwardingFactory): class DatabaseClientForwardingChannel( forwarding.SSHListenClientForwardingChannel): Does anyone have any idea why this might not be working? I tried deferring my query to a thread to see if this would help matters, but to no avail. Any help at all would be appreciated.

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[Twisted-Python] streaming video
by Aljosa Mohorovic 12 Jul '06

12 Jul '06

i'm looking for a way to stream video in python (streaming server for video captured from camera), any tips/examples/docs for doing this with twisted? i'm asking because i have no experience with twisted and any help is appreciated. also, is it possible to use py2exe to create executable files. if using py2exe is not a problem, what is recommended way of using py2exe & twisted? Aljosa Mohorovic

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AW: Re: [Twisted-Python] wxreactor ShowModal problem
by mail＠ortling.com 12 Jul '06

12 Jul '06

Well thanks Bob! btw. wx.FutureCall (ms, func, arg) instead or reactor.callLater works they way i was expecting it to work. Simon > >On Jul 12, 2006, at 1:43 AM, mail(a)ortling.com wrote: > >> I have a problem with a modal dialog blocking wxreactor. If >> ShowDialog () is called from within a deferred callback which has >> been started by reactor.callLater everything twisted comes to a >> halt and continues only after the modal dialog has been closed. The >> sample script below should demonstrate the problem. I'm using >> twisted 2.2 for python2.4. > >That's expected. > >-bob > > >_______________________________________________ >Twisted-Python mailing list >Twisted-Python(a)twistedmatrix.com >http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python

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[Twisted-Python] wxreactor ShowModal problem
by mail＠ortling.com 12 Jul '06

12 Jul '06

Hi everyone, I have a problem with a modal dialog blocking wxreactor. If ShowDialog () is called from within a deferred callback which has been started by reactor.callLater everything twisted comes to a halt and continues only after the modal dialog has been closed. The sample script below should demonstrate the problem. I'm using twisted 2.2 for python2.4. Help! and thanks in advance Simon import sys, os from twisted.internet import wxreactor wxreactor.install () from twisted.internet import reactor, defer import wx class Frame (wx.Frame): def __init__ (self, parent, id, title): wx.Frame.__init__ (self, parent, id, title) btn_dlg = wx.Button (self, -1, "Press", size=(240, 180)) btn_dlg.Bind (wx.EVT_BUTTON, self.click) def click (self, event): d = defer.Deferred () self.prepare (d) def prepare (self, d): """ uncomment reactor.callLater or d.callback to test """ d.addCallback (self.show) reactor.callLater (1.0, d.callback, 1) # this will fail #d.callback (1) # this will work def show (self, val): for i in range (20): reactor.callLater (i*0.2, self.dosth, i) # these will be printed _after_ dialog has been closed dlg = wx.MessageDialog (self, "I am a dialog", "Dialog", style=wx.OK|wx.CANCEL) ruckgabe = dlg.ShowModal () dlg.Destroy () if ruckgabe == wx.ID_OK: print "okay" else: print "not okay" def dosth (self, idx): print "doing something nr", idx class App (wx.App): def OnInit (self): self.frame = Frame (None, -1, "Test") self.frame.Show (1) self.SetTopWindow (self.frame) return True if __name__ == "__main__": app = App () reactor.registerWxApp (app) reactor.run ()

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[Twisted-Python] tcp error
by Michele Petrazzo 11 Jul '06

11 Jul '06

Sometime I receive a strange error: File "hylaproto_t.pyo", line 209, in _RetrStatus File "twisted\protocols\ftp.pyo", line 2190, in list File "twisted\protocols\ftp.pyo", line 2006, in receiveFromConnection File "twisted\protocols\ftp.pyo", line 2081, in _openDataConnection File "twisted\protocols\ftp.pyo", line 1838, in queueCommand File "twisted\protocols\ftp.pyo", line 1819, in sendNextCommand File "twisted\protocols\ftp.pyo", line 2128, in generatePortCommand File "twisted\internet\tcp.pyo", line 591, in getHost AttributeError: 'Client' object has no attribute 'socket' At line 209 in hylaproto_t, I have: self._myClient.list('status', proto) self._myClient are an FTPClient instance. What can be the problem? Thanks, Michele

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[Twisted-Python] Service dependencies
by Matt Goodall 10 Jul '06

10 Jul '06

Hi, I have a couple of services. The second is dependent on the first being fully initialised before the second gets set up. I thought that the order of Service startup was typically handled by organising services in a hierarchy, and that the startup of the hierarchy understood deferreds. I was wrong - service.Application is a MultiService and only understands deferreds in stopService. There's a DependentMultiService class in twisted.internet.app but that entire module has been deprecated. Is there a reason why the MultiService does not support deferreds in startService? Is there a reason that DependentMultiService was not moved across to the twisted.application package? In other words, what is the recommended way of starting services in the correct order, including waiting for them to get initialised fully, these days? Thanks. - Matt -- __ / \__ Matt Goodall, Pollenation Internet Ltd \__/ \ w: http://www.pollenation.net __/ \__/ e: matt(a)pollenation.net / \__/ \ t: +44 (0)113 2252500 \__/ \__/ / \ Any views expressed are my own and do not necessarily \__/ reflect the views of my employer.

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Re : [Twisted-Python] how can I Scheduling a command?
by wang wei 10 Jul '06

10 Jul '06

hi Stéphane, I read codes moring, and I think I catch the idea, if you permit I will modify the code a little to fit in my program. thanks for help.:) Wang Wei

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Re : [Twisted-Python] how can I Scheduling a command?
by wang wei 09 Jul '06

09 Jul '06

hi Stéphane, Great! if it doesn't bother you, could I have a look? thanks. Wang Wei

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com 09 Jul '06

09 Jul '06

Bug summary ______________________ Summary for 2006-07-02 through 2006-07-09 Bugs opened: 18 Bugs closed: 17 Total open bugs: 643 (+1) |== Type Changes |== Priority Changes |== Component Changes |Defect: +1 |Highest: -4 |Conch: +2 |Enhancement: -1 |High: +1 |Core: -1 |Task: +1 |Normal: +2 |Mail: +0 |Low: +2 |Pydoctor: -1 |Trial: -4 |Web: +1 |Web2: +2 |Website: +2 New / Reopened Bugs ______________________ ===== Highest ===== [#1891] twisted.mail.smtp.SMTP incorrectly announces itself as ESMTP (opened by exarkun) (CLOSED, fixed) defect mail http://twistedmatrix.com/trac/ticket/1891 [#1892] Python 2.5 uses "<module>" instead of "?" as the default filename for code objects (opened by exarkun) (CLOSED, fixed) defect core http://twistedmatrix.com/trac/ticket/1892 [#1897] Docstrings should not affect test display (opened by jml) (CLOSED, fixed) defect trial http://twistedmatrix.com/trac/ticket/1897 ===== High ===== [#1896] Put giant warnings about obsoleteness on obsolete webpages (opened by exarkun) task website http://twistedmatrix.com/trac/ticket/1896 [#1906] twisted.web2 tests don't work in cleantests-1883 (opened by jml) defect web2 http://twistedmatrix.com/trac/ticket/1906 ===== Normal ===== [#1893] formatFailure cannot deal with exotic variable names (opened by mthuurne) defect web http://twistedmatrix.com/trac/ticket/1893 [#1894] Need to include web2 in setup.py (opened by edsuom) (CLOSED, invalid) defect core http://twistedmatrix.com/trac/ticket/1894 [#1895] Add Native twisted.web2.xmlrpc Proxy Support (opened by oubiwann) enhancement web2 http://twistedmatrix.com/trac/ticket/1895 [#1898] web2 installation failure on win32 (opened by ghazel) (CLOSED, invalid) defect web2 http://twistedmatrix.com/trac/ticket/1898 [#1899] twisted still uses old-style classes (opened by wrstlprmpft) (CLOSED, wontfix) enhancement core http://twistedmatrix.com/trac/ticket/1899 [#1901] misdefined test method kills trial with an unhandled exception (opened by exarkun) defect trial http://twistedmatrix.com/trac/ticket/1901 [#1902] compatibility work-around for commercial SSH 2.0.12 misbehaviours (opened by matthubb) enhancement conch http://twistedmatrix.com/trac/ticket/1902 [#1903] Twisted doesn't reset timeout when getting POST data (opened by moshez) defect web http://twistedmatrix.com/trac/ticket/1903 [#1904] Passive port ranges are not settable in t.p.ftp (opened by krp) enhancement core http://twistedmatrix.com/trac/ticket/1904 [#1905] twisted.web.client.getPage deferred does not errback in the case of e.g. a 500 error code (opened by glyph) enhancement core http://twistedmatrix.com/trac/ticket/1905 [#1907] Terminal control problem? (opened by Nerdbeard) defect conch http://twistedmatrix.com/trac/ticket/1907 ===== Low ===== [#1890] move examples from core into correct sub-packages (opened by itamarst) enhancement core http://twistedmatrix.com/trac/ticket/1890 [#1900] Error in documentation online (opened by packo) enhancement website http://twistedmatrix.com/trac/ticket/1900 Closed Bugs ______________________ ===== Highest ===== [#661 ] Remove t.e.xmlreflector before Twisted 2.5 (opened by davep, closed by exarkun, fixed) defect core http://twistedmatrix.com/trac/ticket/661 [#1891] twisted.mail.smtp.SMTP incorrectly announces itself as ESMTP (opened by exarkun, closed by exarkun, fixed) defect mail http://twistedmatrix.com/trac/ticket/1891 [#1371] Possible race condition in test_tcp (opened by jml, closed by jml, fixed) defect core http://twistedmatrix.com/trac/ticket/1371 [#1892] Python 2.5 uses "<module>" instead of "?" as the default filename for code objects (opened by exarkun, closed by exarkun, fixed) defect core http://twistedmatrix.com/trac/ticket/1892 [#1871] Instantiating twisted.trial.unittest.TestCase with no arguments raises nasty exception (opened by exarkun, closed by jml, fixed) defect trial http://twistedmatrix.com/trac/ticket/1871 [#1869] twisted.trial.unittest.TestCase.failUnlessFailure should provide more information (opened by exarkun, closed by jml, fixed) enhancement trial http://twistedmatrix.com/trac/ticket/1869 [#1897] Docstrings should not affect test display (opened by jml, closed by jml, fixed) defect trial http://twistedmatrix.com/trac/ticket/1897 ===== High ===== [#1887] Trial man page is extremely out of date (opened by jml, closed by jml, fixed) defect trial http://twistedmatrix.com/trac/ticket/1887 ===== Normal ===== [#1889] twisted.web.microdom should be moved to twisted.python.microdom (opened by jerub, closed by exarkun, invalid) enhancement web http://twistedmatrix.com/trac/ticket/1889 [#1631] Make tables showing listings of members of packages, classes, etc, sortable (opened by moof, closed by mwh, fixed) enhancement pydoctor http://twistedmatrix.com/trac/ticket/1631 [#103 ] $100 bounty - performance monitoring tool (opened by glyph, closed by glyph, invalid) enhancement core http://twistedmatrix.com/trac/ticket/103 [#1894] Need to include web2 in setup.py (opened by edsuom, closed by exarkun, invalid) defect core http://twistedmatrix.com/trac/ticket/1894 [#1787] Last line of trial's traceback output is often difficult to read (opened by jml, closed by jml, invalid) enhancement trial http://twistedmatrix.com/trac/ticket/1787 [#1803] unittest using adbapi hang on exit (opened by thomasvs, closed by jml, duplicate) enhancement core http://twistedmatrix.com/trac/ticket/1803 [#1698] Version option for Trial (opened by jml, closed by jml, worksforme) enhancement trial http://twistedmatrix.com/trac/ticket/1698 [#1898] web2 installation failure on win32 (opened by ghazel, closed by jknight, invalid) defect web2 http://twistedmatrix.com/trac/ticket/1898 [#1899] twisted still uses old-style classes (opened by wrstlprmpft, closed by jknight, wontfix) enhancement core http://twistedmatrix.com/trac/ticket/1899

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Re: [Twisted-Python] UDP question
by jarrod roberson 08 Jul '06

08 Jul '06

On 7/8/06, Alec Matusis <matusis(a)matusis.com> wrote: > > >You can have as many processes listening on a single MULTICAST UDP port > as > you like. > > Well, I am trying to run this example multicast UDP server: > > from twisted.internet.protocol import DatagramProtocol > from twisted.internet import reactor > from twisted.application.internet import MulticastServer > > class MulticastServerUDP(DatagramProtocol): > def startProtocol(self): > print 'Started Listening' > # Join a specific multicast group > self.transport.joinGroup('225.0.0.1') > > def datagramReceived(self, datagram, address): > self.transport.write("data",address) > > reactor.listenMulticast(8005, MulticastServerUDP()) > reactor.run() > > when I try running more that one instance of this on the same machine I > get > > twisted.internet.error.CannotListenError: Couldn't listen on any:8005: > (98, > 'Address already in use'). > > So my quiestion is how can I have multiple processes listening for > multicast > on the same machine? > > ________________________________ > > quick google for "udp twisted listen multiple" reveals def startListening(self): reactor.listenMulticast(5353, self, maxPacketSize=1024, listenMultiple=True)

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