Mailman 3 May 2008 - Twisted

Re: [Twisted-Python] Problem Changing Time Format of a Log
by Andrew Francis 05 May '08

05 May '08

Hi Zookoo and Cameron: On May 2, 2008, at 9:54 AM, Andrew Francis wrote: >Does this mean that the the method raised an exception >but the twisted logging infrastructure isn't telling >you what the exception was? >I've done this successfully: >http://allmydata.org/trac/tahoe/browser/src/allmydata/node.py? >rev=2360#L201 Thanks for the pointer. A part of my problem was that I forgot to import datetime. Anyhow, I re-read the documentation and solved my problem by doing: log.FileLogObserver.timeFormat = '%Y/%m/%d %H:%M:%d" However as Cameron suggested, I will upgrade to Twisted 8 when it is convenient. Cheers, Andrew ____________________________________________________________________________________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ

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[Twisted-Python] How to get port when using application
by Gabriel Rossetti 05 May '08

05 May '08

Hello, I am going to use application and I have a question, I have a server that needs to get a free port, before I would do this : ... port = reactor.listenTCP(0, f).getHost().port ... and now with application all I could find to do the equivilent was : ... t = internet.TCPServer(0, tcpFactory) port = p._getPort()._realPortNumber ... the problem is that this isn't very clean as I'm accessing protected members. Is there a better way of doing this? Thank you, Gabriel

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[Twisted-Python] DNSQueryRefusedError question
by Alvin Delagon 05 May '08

05 May '08

Can anyone explain what is causing this exception? twisted.names.error.DNSQueryRefusedError: <twisted.names.dns.Message instance at 0xb78470cc> I'm using twisted.mail.smtp which subclasses twisted.names.dns. I keep getting this failure during smtp.sendmail(). Thank you in advance. :) --- Alvin Delagon -- http://www.alvinatorsplayground.blogspot.com/

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com 04 May '08

04 May '08

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[Twisted-Python] ldaptor's LDAPClient.send_multiResponse not dealing with chained deferreds, patch
by Michael Torrie 04 May '08

04 May '08

This message is probably for Tv. I have a situation where the callback to a LDAPClient.send_multiResponse() call needs to do a bunch of work that I want to split up over several functions, using deferred chaining. What I want to do is something like this (this in conjunction with an LDAP proxy server I am writing using Twisted and ldaptor): d = self.client.send_multiResponse(request, got_response) then later: def got_response(response): # get a list of other things to do with the response d = do_stuff_with_response(response) d.addCallback(finish) return d def finish(response): # we're done return isinstance(response, ( pureldap.LDAPSearchResultDone, pureldap.LDAPBindResponse, )) However, this doesn't work, because the send_multiResponse() method of LDAPClient isn't expecting the handler to return a deferred, even though if I do return a deferred the reactor does handle it properly, chaining the deferreds and their callbacks. The problem is that in ldapclient.py, line 171, we have: # Return true to mark request as fully handled if handler(msg.value, *args, **kwargs): del self.onwire[msg.id] When handler() returns a deferred object, after the reactor processes the chain the value is a Deferred object, not True or False, even though the value of the deferred object may be True or False. Hence the del self.onwire[msg.id] always executes, which when dealing with search result entries is a problem as they all share the same id. I made a quick hack to fix this: ----------------------------------------------------------- --- /tmp/ldapclient.py 2008-05-03 18:53:26.000000000 -0600 +++ ldaptor/protocols/ldap/ldapclient.py 2008-05-03 18:58:07.000000000 -0600 @@ -168,7 +168,14 @@ assert args is not None assert kwargs is not None # Return true to mark request as fully handled - if handler(msg.value, *args, **kwargs): + result = handler(msg.value, *args, **kwargs) + + try: + result = result.result + except AttributeError: + pass + + if result: del self.onwire[msg.id] ##Bind ---------------------------------------------------------- Is this an acceptable way to do this?

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[Twisted-Python] Problem Changing Time Format of a Log
by Andrew Francis 02 May '08

02 May '08

Hi Folks: I need to change date format of a log - the application I am using wants HH:MM:SS. Twisted seems to give back HH:MM. Based on the example in Abe Fettig's book and looking at Twisted.Python.Log (and I am not sure where to define the timeFormat string), I do the following. class MyLog(log.FileLogObserver): def formatTime(self, when): if self.timeFormat is not None: return time.strftime(self.timeFormat, time.localtime(when)) tzOffset = -self.getTimezoneOffset() when = datetime.datetime.utcfromtimestamp(when + tzOffset) tzHour = int(tzOffset / 60 / 60) tzMin = int(tzOffset / 60 % 60) # added seconds return '%d/%02d/%02d %02d:%02d:%02d %+03d%02d' % ( when.year, when.month, when.day, when.hour, when.minute, when.second, tzHour, tzMin) def emit(self, logEntryDict): log.FileLogObserver.emit(self, logEntryDict) When I run my code in twistd, I get the following error Log observer <bound method InsightLog.emit of <> failed, removing from observer list. Any help would be appreciated in telling me what is going wrong, or pointing out the right way of altering the log. Cheers, Andrew ____________________________________________________________________________________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ

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[Twisted-Python] From asyncore to twisted
by Daniel Brandt 02 May '08

02 May '08

Hello, I'm looking for some advice on how to get started with an asyncore -> Twisted conversion. Being new to twisted I have some trouble getting started (re)designing my system. All ideas are welcome since I'm also doing this to learn. I am about to convert a message-passing daemon written with asyncore to Twisted, and I have two goals in mind. Code that is easier to maintain and expand, and higher reliability. The last part would probably be achievable while sticking with the present code, but since I keep hearing I really should use Twisted instead, I figured I'd try it out :-). The daemon listens for connections from different peers. Some peers just leave a message and disconnect, some peers connect as receivers and linger waiting for messages. A message will be given to the daemon by a messenger, and forwarded by the daemon to exactly one of the connected receivers. The daemon keeps a data structure (a dict with identifier: channel, actually) of receivers which it cycles through in a round-robin fashion. There are more scenarios as well; (recievers may send status messages back to the daemon that the daemon logs, some messengers linger waiting for confirmation from a receiver and a few other) but they are mostly just variations of the above. I'm a bit confused about what parts should be in the Protocol and what should be separated away from it. Should I make a specialized Factory or make a Service (or several depending on what type of client connection it is)? I realize there is a lot in my description that's open for interpretation, but since I'm mostly after design ideas and good practices, I'm hoping that's OK.. Best regards, Daniel Brandt

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[Twisted-Python] Implement a client to telnet to a Linux machine
by Steven Song 01 May '08

01 May '08

I am new to both Python and Twisted framework, so if this has already been dicussed bofore please excuse me. I am trying to implement a client software using Python to telnet to a Linux machine. The login involves authntication with username and password. Can someone please point me to an example if there is one? I know it has something to do with twisted.conch.telnet but am not sure about the detailed implementation yet. Thanks in advance. _________________________________________________________________ Turn every day into $1000. Learn more at SignInAndWIN.ca http://g.msn.ca/ca55/213

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