Mailman 3 November 2012 - Twisted

[Twisted-Python] Making ConnectionPool not pool
by Hynek Schlawack 27 Nov '12

27 Nov '12

Hi, I have a really bad time with the combination of a low-volume service and adbapi.ConnectionPool, pyodbc, FreeTDS and Sybase. Basically my connections just time out and fail in weird, generic ways like: Error: ('01000', '[01000] [FreeTDS][SQL Server]Unexpected EOF from the server (20017) (SQLEndTran)') (but in many others too, there is no real pattern) In my desperation, I’m employing for-loops for the SQL queries now. :( Since there isn’t much traffic (yet) I would like to just make ConnectionPool close the connections and re-open fresh ones, as soon as they are necessary. Is there some straight-forward way to do that? Or any better approach I’ve overlooked? TIA, Hynek

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[Twisted-Python] spawnProcess and kill the child process.
by holsety huang 27 Nov '12

27 Nov '12

hi, all I start a process using spawnProcess and want to kill when my certain Factory stops. something I wrote like these ---------- p = SomeProtocol(ProcessProtocol) reactor.spawnProcess(p, 'twistd', ['twistd', '-y', 'anotherMain.py'], {}) ---------- class Factory(ServerFactory): ... def StopFactory(self): # which is the p above p.transport.signalProcess("KILL") I thought the subprocess will be killed which is not. I tried using p.transport.signalProcess("KILL") some other place, and it works. What's wrong with my code? Thanks! P.S, which is the best way to shut down a twistd, I send the TERM to it now. It just work fine. Regards, Huang

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com 25 Nov '12

25 Nov '12

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[Twisted-Python] utf-8 support for ftp
by Paul Wiseman 22 Nov '12

22 Nov '12

I know this has been asked before, I've found it in several trackers. http://twistedmatrix.com/trac/ticket/5411 http://twistedmatrix.com/trac/ticket/4515 http://twistedmatrix.com/trac/ticket/5100 Some of these were created a while ago, some with patches. I wondered what the current status was with regards to utf-8 in ftp? Is it currently possible? I'm trying to list a folder called 'Paul's Mac Pro', this gets returned as 'Paulâ s Mac Pro'. The client tries to list that folder, and the server returns 'PaulÃ¢Â Â s Mac Pro: No such file or directory.' I think the client is interpreting the bytes that make up the unicode char as separate ascii characters. (maybe a problem with the client? FileZilla 3.6.0.1) This problem may be made worse by my implementation of IFTPShell, I can try to make an example if this isn't the expected result. I'm returning all names and paths back encoded in utf-8, but maybe the problem is the client isn't expecting it because there's no FEAT command (is the patch in 4515 ok to add?) I just want to get an idea of how I can best go about getting this to work. Will I need to build in support, or is it available in a newer version, or by applying some patches? Thanks very much!! Paul

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[Twisted-Python] ftp passive mode returning internal IP
by Paul Wiseman 21 Nov '12

21 Nov '12

This possibly has nothing to do with twisted, but maybe if not someone may be able to point me in the right direction! Basically I've set up a twisted FTP server on ec2, and when a client tries to enter passive mode I'm getting this: Response: 227 Entering Passive Mode (x,x,x,x,159,122). Status: Server sent passive reply with unroutable address. Using server address instead. the x.x.x.x is the boxes private IP, rather than its public IP. It's getting this from ln. 851 in twisted/protocols/ftp.py v12.2.0 Is there somehow I can change the way twisted is getting the IP, or is this an issue with the server set up itself? Any pointers or help on what to look/check for would be of huge help! Thanks! Paul

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[Twisted-Python] Is Ampoule still maintained?
by Maxim Lacrima 20 Nov '12

20 Nov '12

Hi! I would like to use Ampoule [1] package in my project. However, from a look at a project page it seems that it is no longer maintained. The latest release was about 2,5 years ago. Is it just bug free, so new releases aren't required, or is it just unmaintained? Does anyone use it? Thank you [1] https://launchpad.net/ampoule -- with regards, Maxim

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com 18 Nov '12

18 Nov '12

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[Twisted-Python] doc suggestion
by Glyph 16 Nov '12

16 Nov '12

A long time ago, we made an informal policy decision about redundancy between documentation of instance variables and constructor parameters. Specifically we decided that if an initializer simply takes a bunch of parameters, then sets them as attributes on self under the same name, it would be redundant to document them both with @ivar and with @param. Arbitrarily, we decided that @ivar is the one we would standardize on. Later, we decided that too many attributes were public and we should default to making more things private. The unfortunate confluence of these decisions has resulted in API documentation like this: <http://twistedmatrix.com/documents/12.2.0/api/twisted.web.client.Agent.html> Note that the public "__init__" is undocumented, but all the private, greyed-out attributes have documentation. This is technically a violation of the original policy statement - although nobody can really be blamed for that, since as far as I can tell it's not actually written down anywhere - in that the @ivars have different names than the parameters to __init__, since they all start with _. Of course, it would still be super redundant to document everything twice if the parameters and the attributes are in fact the same. However, I think that going forward, this tendency should be amended so that, in the case where the attributes are private but the __init__ parameters are public, they should be documented with @param statements and not with @ivar statements. More generally, if the same thing has to be documented twice, and it's public in one place and private in the other, the public documentation should always be preferred. (And perhaps it should be officially documented in the coding standard.) Thoughts, anyone? Shall I file a ticket? -glyph

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[Twisted-Python] passing exception object to log.err doesn't log traceback?
by Paul Wiseman 15 Nov '12

15 Nov '12

I was just looking at some logs and some of the errors logged without tracebacks, I work out it was when I wasn't passing the error object to log.err- Is this by design? Here is some code which shows it logging and not logging the traceback import os from twisted.python import log from twisted.python.logfile import DailyLogFile logfile= DailyLogFile.fromFullPath(os.path.join(os.path.dirname(__file__),"error.log")) log.startLogging(logfile) def zero_error(): 1/0 def stack(x): if not x: zero_error() else: stack(x-1) def work(x,pass_exception): try: stack(x) except Exception as e: log.err(e if pass_exception else None) if __name__ == "__main__": work(5,True) #Doesn't log traceback work(5,False) #Does log

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[Twisted-Python] FW: No module names "twisted.names" due to confuse twisted-core library folder
by Anil KARADAG 15 Nov '12

15 Nov '12

Hi all, I have a problem about twisted-core library location. I downloaded and installed twisted-10.2-core(TwistedCore-10.2.0.tar.bz2) and names(TwistedNames-10.2.0.tar.bz2) from source code[1]. But python does not find "names" plugin. Because twisted-core has been installed under /usr/lib64/ but names is under /usr/lib/ defaultly. [root@trhtlangley38 sylkserver]# ll /usr/lib64/python2.6/site-packages/twisted/plugins/ total 124 -rw------- 1 root root 979 Jan 3 2008 cred_anonymous.py -rw------- 1 root root 1451 Nov 13 18:02 cred_anonymous.pyc -rw------- 1 root root 1837 Jan 3 2008 cred_file.py -rw------- 1 root root 2222 Nov 13 18:02 cred_file.pyc -rw------- 1 root root 2352 Jan 3 2008 cred_memory.py -rw------- 1 root root 2673 Nov 13 18:02 cred_memory.pyc -rw------- 1 root root 3804 Jan 3 2008 cred_unix.py -rw------- 1 root root 4387 Nov 13 18:02 cred_unix.pyc -rwx------ 1 root root 5868 Nov 13 13:42 dropin.cache -rw------- 1 root root 549 Jul 29 2008 __init__.py -rw------- 1 root root 533 Nov 13 18:02 __init__.pyc -rw------- 1 root root 239 Apr 8 2008 twisted_ftp.py -rw------- 1 root root 341 Nov 13 18:02 twisted_ftp.pyc -rw------- 1 root root 270 Apr 8 2008 twisted_inet.py -rw------- 1 root root 373 Nov 13 18:02 twisted_inet.pyc -rw------- 1 root root 290 Apr 8 2008 twisted_manhole.py -rw------- 1 root root 396 Nov 13 18:02 twisted_manhole.pyc -rw------- 1 root root 285 Apr 8 2008 twisted_portforward.py -rw------- 1 root root 395 Nov 13 18:02 twisted_portforward.pyc -rw------- 1 root root 1417 Dec 23 2006 twisted_qtstub.py -rw------- 1 root root 1996 Nov 13 18:02 twisted_qtstub.pyc -rw------- 1 root root 1420 Nov 15 2006 twisted_reactors.py -rw------- 1 root root 1645 Nov 13 18:02 twisted_reactors.pyc -rw------- 1 root root 257 Apr 8 2008 twisted_socks.py -rw------- 1 root root 361 Nov 13 18:02 twisted_socks.pyc -rw------- 1 root root 298 Apr 8 2008 twisted_telnet.py -rw------- 1 root root 403 Nov 13 18:02 twisted_telnet.pyc -rw------- 1 root root 2034 Dec 25 2009 twisted_trial.py -rw------- 1 root root 1876 Nov 13 18:02 twisted_trial.pyc [root@trhtlangley38 sylkserver]# ll /usr/lib/python2.6/site-packages/twisted/plugins/ total 16 -rw------- 1 root root 257 Apr 8 2008 twisted_names.py -rw------- 1 root root 359 Nov 15 10:30 twisted_names.pyc -rw------- 1 root root 1175 Nov 2 2008 twisted_words.py -rw------- 1 root root 1973 Nov 15 10:29 twisted_words.pyc [root@trhtlangley38 sylkserver]# [root@example ]# python Python 2.6.6 (r266:84292, Sep 12 2011, 14:03:14) [GCC 4.4.5 20110214 (Red Hat 4.4.5-6)] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import twisted >>> print twisted.__file__ /usr/lib64/python2.6/site-packages/twisted/__init__.pyc >>> import twisted.names Traceback (most recent call last): File "<stdin>", line 1, in <module> ImportError: No module named names >>> I tried --prefix options to install method but i cannot pass the problem. Does anyone know how to fix the problem and why the names module is not installed under twisted-core library path. OS: RHEL 6.2 Thanks [1] http://twistedmatrix.com

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