Mailman 3 January 2004 - Twisted

[Twisted-Python] Twisted Weekly News #10
by Luc Stepniewski 06 Jan '04

06 Jan '04

==================================================================== Twisted Weekly News #10 ==================================================================== .. contents:: There wasn't too much mail this week, so I merged the previous TWN with the current, as I was ill last week. If you have any new information, ideas, announcements for the next TWN, please write to me, <lior(a)gradstein.info>. TWN is also available as HTML formated ReST on http://gradstein.info/articles/ twisted_news/twisted_news/twn10 The Twisted Weekly News ------------------------- 9&10th Issue. Sunday, December 28, 2003 QOTW:: http://twistedmatrix.com/pipermail/twisted-python/2003-December/006789.html From a mail by Alan McIntyre: "I just wanted to thank the Twisted developers for making such a cool piece of software. [...] Thanks to Twisted and Python, I was able to start from scratch and put together a server to present some of this data via XML-RPC in about 2 or 3 hours (and that includes looking up a lot of stuff in the documentation)." Discussions ------------- * http://twistedmatrix.com/pipermail/ twisted-python/2003-December/006786.html Jonathan Simms asked for help on his new (new) ftp server code which is currently in sandbox. He asks for help to resolve some problems with authentication on the Windows side. * http://twistedmatrix.com/pipermail/ twisted-python/2003-December/006828.html More and more people are becoming interested in integrating Twisted stuff into their projects. Last week, RodrigB asked about The Circle. This week, Valentino Volonghi asks about the possibility (wish) to replace the pygame event loop with a Twisted reactor. * http://twistedmatrix.com/pipermail/ twisted-python/2003-December/006820.html Michal Pasternak made some tests on Twisted, and noticed some performance degradation after 40 simultaneous connections. Itamar replied there wasn't anything hardcoded that would change Twisted behaviour above 40 simultaneous connections. Cool Thing of the Week ----------------------- * **Treasure of code examples and tutorials for nevow** (http:// www.livejournal.com/users/fzzzy/) fzZzy updated his new blog on LiveJournal with a lot of code samples he wrote for people who asked questions on irc. The second lecture he gave on irc is also available (http://soundfarmer.com/content/logs/ NevowLecture2-121503.txt). With these docs and the previous more "in-depth" documentation from justinj (http://stewstuff.com/doc/nevow.xhtml) you do not any excuse for not learning nevow! * **SFTP support in Zope (using Twisted!)** (http://twistedmatrix.com/ pipermail/twisted-python/2003-December/006839.html) Fred L. Drake, Jr. wrote some support (http://cvs.zope.org/Packages/ SFTPGateway/) for the sftp protocol to be included in Zope. The result may be available as a separate product in a near future. * **Impacket** (http://oss.corest.com/projects/impacket.html) Not related to Twisted, but interesting anyway.Itamar recommended us to take a look at this python library which provides low-level programmatic access to network packets (tcp, udp, etc.). There is also a python pcap implementation on their web site. * **Reminder about the web forum** (http://twisted.banquise.org/) May I remind you that a web interface exists for those that prefer reading informations online? We're barely 8 now, but nobody posts anything which can be discussed :-( Current releases ----------------- * Twisted: 1.1.1 (released 2003-12-10) * Quotient: 0.8.8 (released 2003-12-12) * Twisted Java: 0.6.1 Ok, that's it for this week. Thanks for reading!

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[Twisted-Python] IRIX install
by Hegedus, Matthew S 05 Jan '04

05 Jan '04

Greetings, What's the official word on Twisted IRIX and UNIX installs? A fellow co-worker informed me that she contacted someone from Twisted development who told her that Twisted is not meant for UNIX or IRIX. Thanks, Matthew

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[Twisted-Python] Encrypted PB?
by Michal Pasternak 05 Jan '04

05 Jan '04

How can I plug-in encryption of transmission of PB ?

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[Twisted-Python] dbcred with new api example
by Matthew Sherborne 05 Jan '04

05 Jan '04

Hope this helps someone. It's just a authentication checker. It uses a postgres database to store the usernames and passwords. Enjoy -- Matthew Sherborne Director Sherborne International Ltd.

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[Twisted-Python] Does anyone use instance-only interface implementation
by Itamar Shtull-Trauring 05 Jan '04

05 Jan '04

E.g. Class Foo: pass o = Foo() o.__implements__ = (IBar,) If so, I'd like to hear about it, cause we may want to remove support for it. -- Itamar Shtull-Trauring http://itamarst.org Looking for a job: http://itamarst.org/resume.html

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[Twisted-Python] Re: Re: Resume FTP file retrieval
by Richard Townsend 05 Jan '04

05 Jan '04

Hi Andrew, Thanks very much for your suggestions. I modified my test app to do: size = 10*1024 deferred = ftpclient.queueStringCommand("REST %d" % size) deferred.addCallbacks(setRestSuccess, setRestFailure, callbackArgs=(filename, ftpclient)) In setRestSuccess() I receive the response: ['350 Restarting at 10240. Send STORE or RETRIEVE to initiate transfer.'] Then in setRestSuccess() I do: file_writer = FTPWriterProtocol(filename) deferred = ftpclient.retrieveFile(filename, file_writer) deferred.addCallbacks(downloadSuccess, downloadFail, callbackArgs=(file_writer,), errbackArgs=(file_writer,)) where my protocol is defined as: class FTPWriterProtocol(Protocol): def __init__(self, filename): self.file = open(filename, "ab") def close(self): print 'closing file' self.file.close() def dataReceived(self, data): print "Received %d bytes" % len(data) self.file.write(data) In downloadSuccess() I receive the response: [(1, ["150 Opening BINARY mode data connection for 'SSTEST.TXT' (522000 bytes).", '226 Transfer complete.']), (1, None), (1, None)] However, I actually receive the complete file, and not the partial download I expected. Note: when I use ftplib.FTP.retrbinary() using the "rest" arg (connecting to the same server) I do get the partial download. Any ideas why my Twisted version is not working? regards, Richard Townsend

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[Twisted-Python] examples/row_example.py DBError Row object not in cache
by marjan cinober 04 Jan '04

04 Jan '04

Still trying to test some postgersql access from twisted. Unfortunate at running example ROW (Twisted Enterprise) http://twistedmatrix.com/documents/examples/row_example.py got stuck at File "row_example.py", line 58, in onInsert manager.deleteRow(newRoom).addCallback(onDelete) Anybody has some clues? Thanks Best regards to all of you. Marjan Cinober ----- I am on Linux debian testing (sarge) Package: python2.3-twisted Version: 1.1.0-1 Maintainer: Moshe Zadka <moshez(a)debian.org> ----- $ psql test test=# \i row_schema.sql \q cinober@mym:~/examples$ python row_example.py /usr/lib/python2.3/site-packages/twisted/enterprise/row.py:135: DeprecationWarning: This is deprecated. Use the underlying database to generate keys, or just roll your own. warnings.warn("This is deprecated. Use the underlying database to generate keys, or just roll your own.", DeprecationWarning) got Rooms. [<Room #10: testroom1 (someguy) (10,10)>, <Room #11: testroom2 (someguy) (30,10)>, <Room #12: testroom3 (someguy) (50,10)>] room <Room #10: testroom1 (someguy) (10,10)> furn Furniture #50: room #10 (chair1) (10,10) inner Lamp #21 inner Lamp #22 furn Furniture #51: room #10 (chair2) (14,10) furn Rug 81: room #10, (a big rug) furn Rug 82: room #10, (a blue rug) room <Room #11: testroom2 (someguy) (30,10)> furn Rug 83: room #11, (a red rug) furn Rug 84: room #11, (a green rug) room <Room #12: testroom3 (someguy) (50,10)> furn Furniture #52: room #12 (chair3) (14,10) furn Furniture #53: room #12 (chair4) (10,12) inner Lamp #23 inner Lamp #24 inner Lamp #25 furn Furniture #54: room #12 (chair5) (18,13) furn Furniture #55: room #12 (couch) (22,3) furn Rug 85: room #12, (a dirty rug) updated row. row inserted 100001 ******** BLOCKED ********* Forced to <Ctrl>-C Traceback (most recent call last): File "/usr/lib/python2.3/site-packages/twisted/internet/default.py", line 130, in mainLoop self.runUntilCurrent() File "/usr/lib/python2.3/site-packages/twisted/internet/base.py", line 403, in runUntilCurrent callable(*args, **kw) File "/usr/lib/python2.3/site-packages/twisted/internet/defer.py", line 224, in callback self._startRunCallbacks(result) File "/usr/lib/python2.3/site-packages/twisted/internet/defer.py", line 293, in _startRunCallbacks self._runCallbacks() --- <exception caught here> --- --- <exception caught here> --- File "/usr/lib/python2.3/site-packages/twisted/internet/defer.py", line 307, in _runCallbacks self.result = callback(self.result, *args, **kw) File "row_example.py", line 58, in onInsert manager.deleteRow(newRoom).addCallback(onDelete) File "/usr/lib/python2.3/site-packages/twisted/enterprise/sqlreflector.py", line 330, in deleteRow self.removeFromCache(rowObject) File "/usr/lib/python2.3/site-packages/twisted/enterprise/reflector.py", line 141, in removeFromCache raise DBError("Row object not in cache: %s", rowObject) twisted.enterprise.util.DBError: ('Row object not in cache: %s', <Room #100001: newRoom1 (fred) (100,100)>) _________________________________________________________________ Tired of spam? Get advanced junk mail protection with MSN 8. http://join.msn.com/?page=features/junkmail

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[Twisted-Python] Twisted-Web: Authenticating a usersite-wide ??
by Thomas Weholt 04 Jan '04

04 Jan '04

Hi, I got a problem using a custom-made web-application built upon Twisted. My problem is that when I ask a user for authentication, the cookie or whatever it is, is not available in the request-object for other sites than the one who asked for authentication. I want the user to login on one page, which sets the correct info so I can use request.getUser() and request.getPassword() later on all other pages to validate access to the requested resources. In my RootResource I return something like this if I want the user authenticated: request.setHeader('WWW-authenticate', 'Basic realm="%s"' % ("/")) errpage = error.ErrorPage(http.UNAUTHORIZED, "Unauthorized", "401 Authentication required") return errpage.render(request) Is Basic realm = "/" correct if I want this authentication to be valid site-wide? What else can I use? What other approach can I use? Happy for any hints or clues. Thanks in advance, Thomas

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[Twisted-Python] pb Exchange infrastructure
by marjan cinober 03 Jan '04

03 Jan '04

I have spent last month composing this as a complete begginner in twisted. I need to implement distributed data collection&distributiion network to gradually phase out a currently old mixed standard/vendor/equipment production process monitoring system. The idea is to start a system that will be distributed, redundant and eventually become resistant to a single point of failure by using multiple sensors and delivery networks/paths. These files are working... (Note the last three messages coming in 2s interval.) Fetcher.py - http://shamash.eece.unm.edu:8080/bin.rpy/468 FetchCli.py - http://shamash.eece.unm.edu:8080/bin.rpy/469 , but they must be full of weird/suboptimal solutions as a use of twisted Perspective Broker. And probably the python itself is weak. I would be gratefull of any constructive criticism. :-) Thanks Marjan Cinober _________________________________________________________________ Tired of slow downloads? Compare online deals from your local high-speed providers now. https://broadband.msn.com

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[Twisted-Python] First demo of Twisted Enterprise HOWTO. Twisted RDBMS support.
by marjan cinober 03 Jan '04

03 Jan '04

IŽve been trying to start twisted RDBMS by following howto. After a couple of hours it's finaly working. I came up to this... It's maybe worth updating howto with working examples to save some time. I know that missing lines are completly obvious to most of experienced users but I was hopeing howto will make me run some demo tests immediately, even thow I'm just a dumb beginner. #!/usr/bin/python # EnterpriseDemo.py """First demo of Twisted Enterprise HOWTO. Twisted RDBMS support.""" from twisted.python import log from twisted.internet import reactor from twisted.enterprise import adbapi # use this line for postgresql test dbpool = adbapi.ConnectionPool("pyPgSQL.PgSQL", database='mydb') # equivalent of cursor.execute(statement), return cursor.fetchall(): def getAge(user): return dbpool.runQuery( """SELECT age FROM users WHERE name = '%s'""" % user) def printResult(l): if l: print l[0][0], "years old" else: print "No such user" reactor.stop() getAge("joe").addCallback(printResult).addErrback( log.err) reactor.run() ############### Setup on Debian Testing ## su ## su - postgres ## createuser -d -a _MyUserName_ ## exit ## su - _MyUserName_ ## createdb -U _MyUserName_ mydb "Demo Database mydb" ## psql mydb ## ## drop table users; ## CREATE TABLE users ( ## name varchar(64), ## age int ## ); ## ## insert into users values( 'joe', 35); ## insert into users values( 'jonas', 25); ## insert into users values( 'josefa', 16); ## ### QUICK TEST ### ## select * from users; ## SELECT age FROM users WHERE name = 'joe'; ############# _________________________________________________________________ STOP MORE SPAM with the new MSN 8 and get 2 months FREE* http://join.msn.com/?page=features/junkmail

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