Mailman 3 December 2005 - Twisted

[Twisted-Python] user interaction & the reactor
by Lenny G Arbage 01 Dec '05

01 Dec '05

Where can I find examples or instructions on combining the reactor with [command-line] user interaction? I've been searching every resource I can, and know it must be possible based on threads like this one: http://twistedmatrix.com/pipermail/twisted-python/2005-June/010625.html . I /can/ block on a call made from within the reactor while waiting for user's raw_input, but that doesn't allow me to give live feedback to the user from incoming status messages, and might cause problems if a large number of status messages arrive while the user is 'away'. All the example clients I can find inside of twisted are not [user-] interactive (ftpclient, echoclient, simpleclient, etc). Am I looking in the wrong place? Have I missed a howto? Specifically I have a server that takes commands via a protocol I define and a client that sends commands to the server. The commands on the server take some time (on the order of 20 seconds to many minutes) to complete or error out. Once they do, status is sent back to the client, i.e., the user can issue many commands that are concurrently 'pending', completing when the server sends back status. I've started by running the client reactor in a thread, and then using the main thread to get input from the user. Am I making this more difficult than it needs to be? Is there some way to integrate user action (keyboard input) as events into the reactor's event model? Or is there a better approach? Thanks, Lenny __________________________________ Yahoo! Music Unlimited Access over 1 million songs. Try it free. http://music.yahoo.com/unlimited/

3 2

[Twisted-Python] New to twisted
by Fred Hauck 01 Dec '05

01 Dec '05

I am not only new to twisted, but to python as well. I need what twisted does, so went out and got the "twisted" book by abe fettig. I am coding each example in the book as i get there. the connectiontest.py example on page 16 gives me a call back on success, but not on error. from twisted.internet import reactor,defer, protocol class CallbackAndDisconnectProtocol(protocol.Protocol): def connectionMade(self): self.factory.deferred.callback("Connected!") self.transport.loseConnection() class ConnectionTestFactory(protocol.ClientFactory): protocol = CallbackAndDisconnectProtocol def __init__(self): self.deferred = defer.Deferred() def clientConnnectionFailed(self, connector, reason): self.deferred.errback(reason) def testConnect(host, port): testFactory = ConnectionTestFactory() reactor.connectTCP(host, port, testFactory) return testFactory.deferred def handleSuccess( result,port): print "Connected to port %i" % port reactor.stop() def handleFailure(failure, port): print "Error connecting to port %i: %s" % (port,failure.getErrorMessage()) reactor.stop() if __name__ == "__main__": import sys if not len( sys.argv) == 3: print "Usage: connectiontest.py host port" sys.exit(1) host = sys.argv[1] port = int(sys.argv[2]) connecting = testConnect(host, port) # connecting.addCallback( handleSuccess, port) # connecting.addErrback( handleFailure,port) connecting.addBoth( handleFailure,port) reactor.run() The environment is: Windows XP sp2 python 2.4.1 from activestate twisted_nodocs-2.1.0.win32-py24.exe (installed) When chasing this down, go into the main loop and there are comments about "signals" not working in windows, etc. etc. CallLater works fine, successful callback works fine, the errback does not thanks in advance fred

2 1

[Twisted-Python] FTPS server
by Vijay Rao 01 Dec '05

01 Dec '05

Hi , I am trying to use a 'virtual' twisted FTP server ( using 2.1.0 ) in an application which can use a database instead of the file system. It seems to work fine except I could not connect over SSL/TLS since the FTP security extensions enhancement http://www.ietf.org/rfc/rfc2228.txt is not yet implemented. Is there any plan to add this in the near future / any simple way to add it cleanly ? Thanks Vijay -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.1.362 / Virus Database: 267.13.10/188 - Release Date: 11/29/2005

2 1

[Twisted-Python] My review of Abe's book "Twisted Network Programming Essentials"
by Tommi Virtanen 30 Nov '05

30 Nov '05

Hi. I just finished a review of the new O'Reilly book on Twisted, by Abe Fettig (hi Abe!), and thought you all might be interested in it: http://tv.debian.net/articles/review-snakeball/

4 4

[Twisted-Python] Re: [Twisted-commits] r15230 - Merge of jml/trial-deferred-logic -r15183:15229. Resolves #1341.
by Jean-Paul Calderone 30 Nov '05

30 Nov '05

On Sun, 27 Nov 2005 23:35:45 -0700, Jonathan Lange <jml(a)wolfwood.twistedmatrix.com> wrote: >Author: jml >Date: Sun Nov 27 23:35:45 2005 >New Revision: 15230 > >Modified: > trunk/twisted/mail/test/test_mail.py > trunk/twisted/test/test_ftp.py > trunk/twisted/test/test_ssl.py > trunk/twisted/test/test_tcp.py > trunk/twisted/trial/reporter.py > trunk/twisted/trial/runner.py > trunk/twisted/trial/test/detests.py > trunk/twisted/trial/test/test_deferred.py > trunk/twisted/trial/test/test_failure_formatting.py > trunk/twisted/trial/test/test_keyboard.py > trunk/twisted/trial/test/timeouts.py > trunk/twisted/trial/unittest.py > trunk/twisted/trial/util.py > trunk/twisted/web/test/test_webclient.py >Log: >Merge of jml/trial-deferred-logic -r15183:15229. Resolves #1341. > The Gtk reactor can no longer complete the test suite: http://twistedmatrix.com/buildbot/reactors/builds/884/step-gtk/0 On my machine, the suite hangs in twisted.web.test.test_webclient.CookieTestCase.testNoCookies, but it seems to die in twisted.test.test_tcp.HalfClose2TestCase.testNoNotification on buildbot every time. This may just be a race (or several races) going different ways on a somewhat reliable fashion on the different hardware. It seems like the remaining reactor.iterate() calls are the likely cause of this? Jean-Paul

3 3

[Twisted-Python] implementing scp using Conch
by erick_bodine＠comcast.net 30 Nov '05

30 Nov '05

Using a suggestion from David Mertz's old article I am implementing scp using Conch. I can scp from the server to the client, it does give an exception listed below. Question #1 is why is the exception happening? Question #2 is how to scp from the client to the server? Can I use sendRequest() to open a file and then Channel.write('some data') to send the client file contents? Traceback (most recent call last): File "client_mertz.py", line 80, in ? reactor.run() File "/usr/lib/python2.3/site-packages/twisted/internet/posixbase.py", line 206, in run self.mainLoop() File "/usr/lib/python2.3/site-packages/twisted/internet/posixbase.py", line 214, in mainLoop self.runUntilCurrent() --- <exception caught here> --- File "/usr/lib/python2.3/site-packages/twisted/internet/base.py", line 541, in runUntilCurrent call.func(*call.args, **call.kw) File "/usr/lib/python2.3/site-packages/twisted/internet/base.py", line 397, in _continueSystemEvent for callList in sysEvtTriggers[1], sysEvtTriggers[2]: exceptions.TypeError: unsubscriptable object -- --ERick

2 1