Mailman 3 July 2006 - Twisted

[Twisted-Python] UDP question
by Alec Matusis July 8, 2006

July 8, 2006

I have a question about using UDP in twisted. I hope people will forgive my naiveté, since my background is in physics, not in CS, so I am self-taught and may be missing something obvious. I would like a server to send UDP broadcasts to multiple clients, where all clients receive the same broadcast. >From what I understood from http://twistedmatrix.com/projects/core/documentation/howto/udp.html Multicast UDP section, one can have a client broadcast the same UDP packet to multiple servers, each server listening on the same port for this multicast. This is unacceptable for me, since all of this must happen on the same machine, so I cannot bind multiple servers to the same port on one box. So I am trying to implement a reverse scenario, where the server will do the multicast to clients, but all clients and the server may (or may not) be running on the same box. How can I do this in twisted? Could you give me and example? Thanks.

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[Twisted-Python] Insults, Can't write from connectionMade?
by Mike Pelletier July 8, 2006

July 8, 2006

Hello, twisted Twisted coders. I am trying to get familiarised with twisted.conch.insults. I've run into some behaviour I cannot explain. Attached is a .tac including the following excerpt: class MyTerminalProtocol(insults.TerminalProtocol): width = 80 height = 24 def connectionMade(self): self.terminalSize(self.width, self.height) self.terminal.write(" world\n") def terminalSize(self, width, height): self.width, self.height = width, height self.terminal.eraseDisplay() self.terminal.write("Hello,") When a connection is made, the screen is cleared and "Hello," is written, but " world\n" is not (or at least it never appears on the terminal). Why is "world\n" not written? Oddly (or perhaps revealingly for someone with more clues than me), when in a previous version I did not use TelnetTransport and TelnetBootstrapProtocol, I was able to write just fine from connectionMade. TIA for a liberal and violent application of the clue stick. Mike.

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[Twisted-Python] how can I Scheduling a command?
by wang wei July 8, 2006

July 8, 2006

hi, is there any modules in twisted to do such things? at 9:00 am post a mail, at 4:00 pm, to give me report? thanks.

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[Twisted-Python] Bay Area Twisted Sprint - July 15th and 16th
by David Reid July 8, 2006

July 8, 2006

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 This is the official announcement of the Bay Area Twisted Sprint. It is to be held on July 15th and 16th at the offices of Three Rings Design Inc. (the people who brought you that wonderful tool of procrastination "Puzzle Pirates") which are located at: 612 Howard St, Suite 500 San Francisco, CA 94150 Google Map: http://tinyurl.com/pb588 The sprint will last from 10am-8pm on Saturday the 15th and Sunday the 16th, and will focus on closing outstanding bugs (perhaps followed by some sort of maintenance releases.) If you're going to be attending the sprint reply to this email so that our gracious hosts have some idea of what to expect. Thanks - -David - -- "Usually the protocol is this: I appoint someone for a task, which they are not qualified to do. Then, they have to fight a bear if they don't want to do it." -- Glyph Lefkowitz -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (Darwin) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFEr0AirsrO6aeULcgRAvgVAKCJkgO7r/4Bstck16GS3VaYArRUnACfXv8s sE45pM4dGEdPAQ5hok4IyCs= =gfYe -----END PGP SIGNATURE-----

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[Twisted-Python] deferred object inside function
by Yusnel Rojas García July 8, 2006

July 8, 2006

how can I make a function which have a deferred object return a value that depends of the deferred object's result. example: how can get the result from the resolver? from twisted.names import client, dns def somefunction(somepars): r = client.Resolver('/etc/resolv.conf') d = r.resolve(dns.Query('www.example.com', dns.MX, dns.IN)) d.Callbacks(somefunct1, somefunctErr2) return ? cheers one

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[Twisted-Python] Want the degree but can't find the time?
by Wilton Conklin July 7, 2006

July 7, 2006

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[Twisted-Python] Re: what's wrong in my code?
by wang wei July 6, 2006

July 6, 2006

thanks for help, I will read the documents of smart-questions soon:) last night I read the twisted's book on the its web site, and I think there are 2 major mistake there. 1. the defer should not be inintinitialized in the __init__ phase, that's easy to understood why there are AlreadCalledError. 2. twisted use task to run the loop. :D that's a sample code here. from twisted.internet import reactor, defer, task class snmpFactory: def __init__(self): def readValue(self): self.deferred = defer.Deferred() vol = readValue(self.voltageIp, voltageOid) temp = readValue(self.powerIp, temperatureOid) reactor.callLater(0, self.handleResult, (vol, temp)) return self.deferred def handleResult(self, (vol, temp)): slice = time.strftime("%H:%M:%S") print slice, ' the voltage is %s\nthe temperature is %s' % (vol, temp) s = snmpFactory() l = task.LoopingCall(s.readSnmpValue) l.start(2) reactor.run() It's my first twisted program, thank for Jonathan.

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[Twisted-Python] Newbie to twisted
by xie marffin&tian July 5, 2006

July 5, 2006

hi I learned python and was a new user to twisted. It's a bit complex. I tried to start from reading the "core developper guide"(book.pdf) but I still couldn't find the direction. Is there any advice on how to start twisted programming or any other friendly tutorial? many Thanks!

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[Twisted-Python] Re: [Twisted-commits] r17484 - Branching to callQueue∞-1741
by James Y Knight July 5, 2006

July 5, 2006

For future reference, at least the following things failed to work with unicode in the branch/file name: emacs couldn't open files in the directory using c-x c-f, but could from the command line (osx only issue possibly) buildbot wouldn't build the branch combinator couldn't make the branch "svn log --stop-on-copy" couldn't "recode string" and wouldn't display anything. The svn mailer script properly encoded the body in utf8, but the subject was marked as encoded in latin-1 while really being in utf8. So, consider the experiment failed. I'd like to suggest a new rule: ascii filenames only. :) James On Jul 4, 2006, at 1:51 PM, James Knight wrote: > Author: foom > Date: Tue Jul 4 11:51:02 2006 > New Revision: 17484 > > Added: > branches/callQueue∞-1741/ > - copied from r17483, trunk/ > Log: > Branching to callQueue∞-1741 > > _______________________________________________ > Twisted-commits mailing list > Twisted-commits(a)twistedmatrix.com > http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-commits >

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[Twisted-Python] what's wrong in my code?
by wang wei July 5, 2006

July 5, 2006

hi, I got 'twisted.internet.defer.alreadycallederror' error back. here is my code, what's wrong in it? thanks for help. class snmpFactory: def __init__(self, filename): self.deferred = defer.Deferred() def readValue(self): vol = readValue(self.voltageIp, voltageOid) temp = readValue(self.powerIp, temperatureOid) self.deferred.callback((vol, temp)) self.deferred.addCallback(self.handleResult) def handleResult(self, (vol, temp)): slice = time.strftime("%H:%M:%S") print slice, ' the voltage is %s\nthe temperature is %s' % (vol, temp) s = snmpFactory() i = 1 while (i < 10): reactor.callLater(5, s.readSnmpValue) i += 1 time.sleep(10) reactor.run()

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