Mailman 3 May 2004 - Twisted

[Twisted-Python] When do calls to transport.write() block ?
by Stefan Behnel May 11, 2004

May 11, 2004

Hi everyone! I have looked through quite a bit of Twisted's code by now, but I just can't manage to figure out how those transport.write()s work. The servers I looked through always come back to this without putting any special treatment into it. My question is: If a server starts sending as fast as it can, what will happen to the output queue? Will Twisted just eat up all memory with buffers? Will it start blocking? Will it open up a thread? What will it do? Since this really is an … [View More]

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[Twisted-Python] Indeed it works...
by James R. Saker Jr. May 10, 2004

May 10, 2004

Thanks Christopher and Glyph - indeed it works (this is all strange and new to a long-time network engineer!) Modified as Christopher suggested, it returns a tuple: Result is: [(36,)] Nifty... thanks! Jamie

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[Twisted-Python] New components questions
by Itamar Shtull-Trauring May 10, 2004

May 10, 2004

1. Currently, if c is a Componentized, IFoo(c, persist=False) will bypass c.getComponent() and do standard lookup. Is it worth supporting this at all? It'd make code cleaner if not, and integration with zope.interface easier. 2. How do we package zope.interface package? We could: a. include copy of code, as e.g. twisted.interface, and have it replace itself with zope.interface if that exists. This opens us to possible _xmlplus style horribleness. b. install zope.interface in our … [View More]

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[Twisted-Python] Missing something basic on defer and postgresql
by James R. Saker Jr. May 10, 2004

May 10, 2004

I think I'm missing something rather basic and would greatly appreciate any suggestions. After working through the Twisted RDBMS example (with no luck - the second RDBMS example gets a deferred but fails to run .addCallback(printResult), I thought I'd read more about deferreds in its own section and made a simple postgresql example using the third example in the Deferreds section. When I run this (with database = postgresql, dbname = mydb, table = myuser), it yields the following: Got to … [View More]getData got to gotResults with name = Joe ...but never runs addCallback(self, _toHTML). Apparently I'm missing something pretty obvious about callbacks - and may be the same issue I dealt with in the RDBMS example. Any suggestions? jamie ##~ begin dbserver.py from twisted.enterprise import adbapi from twisted.internet import reactor, defer dbpool = adbapi.ConnectionPool("psycopg", 'dbname=mydb user=postgres') class Getter: def gotResults(self, name): print "got to gotResults with name = %s" % name return dbpool.runQuery("SELECT age FROM myuser WHERE name = '%s'" % name) def _toHTML(self, r): print "Got to _toHTML" print "Result is: %s" % r def getData(self, x): self.d = defer.Deferred() print "Got to getData" reactor.callLater(2, self.gotResults, x) self.d.addCallback(self._toHTML) return self.d def printData(d): "Got to printData" print d def printError(failure): import sys sys.stderr.write(str(failure)) if __name__ == '__main__': g = Getter() d = g.getData('Joe') d.addCallback(printData) d.addErrback(printError) reactor.callLater(4, reactor.stop); reactor.run() ##------------postgresql database table info---------------------------- mydb=# select * from myuser; pkid | name | age ------+--------+----- 1 | Joe | 36 2 | Sally | 15 3 | Peanut | 5 (3 rows) mydb=# SELECT age FROM myuser WHERE name = 'Joe'; age ----- 36 (1 row) [View Less]

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[Twisted-Python] You also want to read this
by Itamar Shtull-Trauring May 7, 2004

May 7, 2004

http://intertwingly.net/stories/2004/05/04/reality-is-corrosive.html

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[Twisted-Python] Reading material
by Itamar Shtull-Trauring May 7, 2004

May 7, 2004

For PB developers: http://research.sun.com/techrep/1994/smli_tr-94-29.pdf For people working on networking in general: http://web.mit.edu/Saltzer/www/publications/endtoend/endtoend.txt -- Itamar Shtull-Trauring http://itamarst.org Looking for a job -- http://itamarst.org/resume.html

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[Twisted-Python] twisted on os x: cfreactor or kqreactor?
by rayg May 7, 2004

May 7, 2004

i just created a fink package for PyKQeue (http://sourceforge.net/tracker/index.php?func=detail&aid=940552&group_id=17…) and this now allows me to use kqreactor. if i'm not not planning on using any cocoa functionality, is there any advantage to use cfreactor over kqreactor on os x? i wasn't able to find any direct comparison between the mechanisms behind kqreactor and cfreactor, but i did see that NSRunLoop is asynchronous, like kqueue. i've tested both reactors on a simple script … [View More]

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[Twisted-Python] t.p.http handling of multipart/form-data
by Stephen C. Waterbury May 6, 2004

May 6, 2004

Hey http rewriting team ... (or more specifically foom, I think :) I'm (for my sins, no doubt) using the multipart/form-data implementation in t.p.http to transfer files, and it works okay but could be improved. I'm sure this is not at the top of your priority list for the rewrite (or even *on* it, probably :), but I'd just like to go on record as in favor of a possible enhancement. Let me know if I should put this into the issue tracker as a feature request. (1) Access to enclosure … [View More]

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[Twisted-Python] newjelly -- mature or forgotten?
by Andrew Bennetts May 4, 2004

May 4, 2004

What's the status of newjelly? Should we consider making it the real jelly for the next major release? It seems to have been forgotten about, although it still passes the same tests that jelly does, and the pb and spread tests also pass with newjelly, so I presume it's working fine... so why hasn't it replaced the current jelly.py? We have bug reports (and patches!) sitting in the issue tracker for jelly, e.g. http://twistedmatrix.com/users/roundup.twistd/twisted/issue426. That one is, I … [View More]

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[Twisted-Python] setUnjellyableForClass
by Sorin C. May 1, 2004

May 1, 2004

Hi all, Is it possible to skip this declaration for classes that I want to pass remotely? I have many data holding classes and I am not interested in security so it's kinda verbose to call setUnjellyableForClass for every class that I want to pass remotely. Thanks, Sorin __________________________________ Do you Yahoo!? Win a $20,000 Career Makeover at Yahoo! HotJobs http://hotjobs.sweepstakes.yahoo.com/careermakeover

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