Mailman 3 March 2003 - Twisted

[Twisted-Python] mktap --uid=0 bug
by Tommi Virtanen March 4, 2003

March 4, 2003

If you do mktap --uid=0 --gid=0, t.i.app ignores your setting and stores the uid/gid of the user running mktap. Here's a patch; if I hear no objections, I will commit. Index: twisted/internet/app.py =================================================================== RCS file: /cvs/Twisted/twisted/internet/app.py,v retrieving revision 1.79 diff -u -u -r1.79 app.py --- twisted/internet/app.py 1 Mar 2003 21:58:47 -0000 1.79 +++ twisted/internet/app.py 4 Mar 2003 13:55:05 -0000 @@ -281,8 +282,12 … [View More]

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[Twisted-Python] threadable.init() operation
by Clark C. Evans March 4, 2003

March 4, 2003

I've read the threading/enterprise howtos and am still trying to grok thread <-> event loop communication. In particular, I'm curious what exactly what threadable.init() does. I was expecting something rather simple, which implementes communcation between the main event pump and each thread (callInThread, callFromThread). However, this code seems to be doing much more than that, and I don't quite understand what it is doing or why. A bit of a primer would be great. I'm asking this … [View More]

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[Twisted-Python] [Twisted Newbie] Proxies
by Iggeres Bet March 4, 2003

March 4, 2003

Dear Twisted List, I am a Twisted Newbie, searching in the examples directory I didn't find one sample to guide me how to use the Spider with a Proxy. I know it must be a simple solution and I would like to know that solution. The spider sample is very simple: ----- o ----- #!/usr/bin/python from twisted.web import spider from twisted.web import proxy from twisted.internet import app from twisted.python.util import println a = app.Application("spider") s = spider.SpiderSender("… [View More]

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[Twisted-Python] Uid race in t.runner.procmon
by Tommi Virtanen March 4, 2003

March 4, 2003

If you use mktap -u 42, there's a race in twisted.runner.procmon; the first time the process is started, it gets started as root, the later runs happen as user 42. This is due to the first run happening from startService, which is called before setuid(42). Either the startService() call should be delayed after the setuid() (separate port binding from other service startup things), or procmon should use something like callLater. -- :(){ :|:&};:

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[Twisted-Python] patch implementing deferIterationToThread
by Clark C. Evans March 4, 2003

March 4, 2003

Please find a patch to internet/defer.py and iternet/threads.py which enables an "iterator" to be deferred to a thread. This is useful since often you have a long running process (a database query for example) which you'd like to return results every once and a while rather than delivering all of the output at the end of the process. This patch adds to the given files (it doesn't change any code). The remainder of the message is hereby public domain. # # code to append to defer.py # class … [View More]MultiCallDeferred(Deferred): """This is a verision of Deferred which can be invoked more than once. This is accomplished by cloning the current deferred object and carrying out the callbacks on the clone. """ def _startRunCallbacks(self, result, isError): clone = Deferred() clone.default = self.default for x in self.callbacks: clone.callbacks.append(x) clone._startRunCallbacks(result, isError) # # code to be added to threads.py # def _putIterationInDeferred(deferred, f, args, kwargs): """Send the results of an iteration to a deferred. The function called should return an object with a next() operator. This is the ideal mechanism to defer a generator. """ from twisted.internet import reactor try: itr = apply(f, args, kwargs) while 1: reactor.callFromThread(deferred.callback, itr.next()) except StopIteration: pass except: f = failure.Failure() reactor.callFromThread(deferred.errback, f) def deferIterationToThread(f, *args, **kwargs): """Run the results of an iterator in a thread.""" d = defer.MultiCallDeferred() reactor.callInThread(_putIterationInDeferred, d, f, args, kwargs) return d # # usage using iterators (or generators for simpler syntax) # from twisted.internet.threads import deferIterationToThread from twisted.internet import reactor class producer: def __init__(self): self.val = 9 def next(self): val = self.val if val < 1: raise StopIteration self.val -= 1 return val def bldr(): return producer() def printResult(x): print x d = deferIterationToThread(bldr) d.addCallback(printResult) try: # if you have generators from __future__ import generators def gene(start=99): while(start > 90): yield start start -= 1 d = deferIterationToThread(gene) d.addCallback(printResult) except: pass reactor.run() [View Less]

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[Twisted-Python] PEP 308 (ternary operation) voting is open
by Itamar Shtull-Trauring March 2, 2003

March 2, 2003

http://mail.python.org/pipermail/python-announce-list/2003-March/002083.html -- Itamar Shtull-Trauring http://itamarst.org/ http://www.zoteca.com -- Python & Twisted consulting ***> Stop the war: http://unitedforpeace.org/ <***

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[Twisted-Python] GtkWindow
by Philippe Lafoucrière March 2, 2003

March 2, 2003

hello I have a pb (the same as the thread "Gtk version" when I try to run manhole: " Traceback (most recent call last): File "/usr/bin/manhole", line 33, in ? from twisted.scripts import manhole File "/usr/lib/python2.2/site-packages/twisted/scripts/manhole.py", line 23, in ? from twisted.spread.ui import gtkutil File "/usr/lib/python2.2/site-packages/twisted/spread/ui/gtkutil.py", line 62, in ? class GetString(gtk.GtkWindow): AttributeError: 'module' object has no … [View More]

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[Twisted-Python] [OT] Make Python Faster
by Jp Calderone March 1, 2003

March 1, 2003

Skip Montanaro has an xmlrpc server set up to collect information on Python byte code occurrence frequencies. With data from enough sources, some useful information about optimizations that can be made to Python might be extracted. Attached is a patch that causes twistd to spill its guts onto his server when it shuts down. It requires an interpreter with sys.getdxp, which is only available if Python is built with DYNAMIC_EXECUTION_PROFILE, and optionally DXPAIRS, defined (it won't break … [View More]

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[Twisted-Python] Automatically refresh imported module from source
by Thad Jacobs March 1, 2003

March 1, 2003

Hello All, My name is Thaddeus, and I am new to both Python and Twisted (I found out about the language and platform yesterday). I am doing some experimentation to see how Twisted would benefit our organization. So far Python blows every other language I've seen out of the water, in terms of efficiency and low cost of change. What I'd like to know is if there is a way to modify the way twisted web handles requests from within RPY scripts to external py modules. If I modify the py module … [View More]

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