Mailman 3 November 2003 - Twisted

[Twisted-Python] Twisted Python 0.7.0 Prerelease Testing
by Glyph Lefkowitz 05 Aug '21

05 Aug '21

hi there, folks: I'd really like to release 0.7.0 but I would like it to be at least a little bit tested before I do so. Could those of you with CVS trees check everything out and see if it performs as advertised? Deeper bugs than that will have to wait for the next release, but I'd at least like to know if it works for someone other than me. Thanks. ______ __ __ _____ _ _ | ____ | \_/ |_____] |_____| |_____| |_____ | | | | @ t w i s t e d m a t r i x . c o m http://www.twistedmatrix.com/~glyph/

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[Twisted-Python] Re: [Twisted-commits] log stderr and non-zero exit code in CGIs, don't show info to users as it is a security risk (closes issue #241)
by Glyph Lefkowitz 01 Jan '04

01 Jan '04

On Thursday, August 28, 2003, at 10:32 AM, itamarst CVS wrote: > log stderr and non-zero exit code in CGIs, don't show info to users as > it is a security risk (closes issue #241) We shouldn't swallow errors in these situations. If it's a security risk, provide a way for the server administrator to turn it off, but this is a _bad_ default. If you doubt the wisdom of making this default, please consult any number of Perl FAQs of the form: Q. "I wrote a CGI and it works perfectly, but now I moved it to another server and I get nothing but a "500 Internal Server Error" page. How do I tell what went wrong!?!?!?" A. Look in your apache logs. --- Q. "I looked at my apache logs and nothing makes sense! How do I tell what the error was??!" A. ... Also, could you clarify the security risk of displaying stderr from CGI scripts? I've never heard of a CGI that puts security-critical information on stderr rather than stdout and makes it a risk to display to users.

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[Twisted-Python] Woven and nested database queries
by Wenderson Teixeira 01 Dec '03

01 Dec '03

Hi, I'm new to the list and I'm just starting with Twisted and Woven. I think the framework is great, but I'm having some problems. When I try to make two nested <div>, both with independent queries, I get na error, the solution I've found is to create another model called "loaddata", which does nothing, except call the queries. If anyone knows a better way, I'd like to hear, I've searched all over the Internet, and found nothing that could help. Thanks in advance, Wenderson Teixeira Here is the minimum working code that exemplifies it: from twisted.web.resource import Resource from twisted.web.woven import page from twisted.web import microdom from twisted.enterprise import adbapi class A(page.Page): # When "loaddata" is not present, I get the following error: # exceptions.AttributeError: DeferredWidget instance has no attribute 'd' template = """ <html> <body> <div model="loaddata"/> <p>A</p> <div model="a"> <div view="Text"/> <p>B</p> <ul model="b" view="List"> <li pattern="listItem" view="Text" /> </ul> </div> </body> </html> """ def wmfactory_loaddata(self, request): self.runAQuery(request) self.runBQuery(request) return [] def wmfactory_a(self, request): return self.runAQuery(request) def wmfactory_b(self, request): return self.runBQuery(request) def runQuery(self, queryStr, attr, callback): if not hasattr(self, attr): dbpool = adbapi.ConnectionPool("pyPgSQL.PgSQL", "192.168.1.180::manesco_01:manesco") deferredQuery = dbpool.runQuery(queryStr) deferredQuery.addCallback(callback) dbpool.close() return deferredQuery return getattr(self, attr) def runAQuery(self, request): # Sample data #return [[1, 'Wenderson', 'WT', 2, 'Tex', None]] return self.runQuery("SELECT * FROM advogado WHERE id_adv=77", "aDataset", self.gotAResult) def runBQuery(self, request): # Sample data #return [ # [1, 'Advogado Sr.'], # [2, 'Advogado Pleno'], # [3, 'Advogado Jr.'], # [4, 'Estagiario'], # [5, 'Assist. Criatividade'], # [6, 'Empresario'], # [7, 'Departamento Pessoal'] #] return self.runQuery("SELECT * FROM categoria", "bDataset", self.gotBResult) def gotAResult(self, data): self.aDataset = data return data def gotBResult(self, data): self.bDataset = data return data resource = A(directory = "C:\inetpub\wwwroot\man")

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[Twisted-Python] getProcessOutpout
by Philippe Lafoucrière 30 Nov '03

30 Nov '03

I have a pb with twisted.internet.utils.getProcessOutput (i never get the output :() here is an exemple : class PGAT_deftest(GAT_page): template="""<html><body><span view="Viewtest"></span></body></html>""" def wvfactory_Viewtest(self, request, node, model): return MyDeferredWidget(model) def render(self, request): request.write('<html><body><h1>DEFTEST</h1>'+ time.asctime()+'<br >') print "Emerge !" d = getProcessOutput("ps") d.setTimeout(5,self.renderProcessOutput, request) d.addCallback(self.renderProcessOutput, request) d.addErrback(self.renderError, request) d.addCallback(self.finishPage, request) return NOT_DONE_YET def renderProcessOutput(self, output, request): request.write(output) def renderError(self, failure, request): request.write('it broke! (error : "'+failure.getErrorMessage()+'")') def finishPage(self, _, request): request.write('</body></html>') request.finish() def montest(): time.sleep(5) return "Ca marche !" If I create a bash script with : --- sleep(5) echo "Hello world" --- the twisted code above works great. But If I use a system program like "ps" or "emerge" , the callback is never called :( (btw : getProcessOutput ("date") works)

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[Twisted-Python] Re: python-list query re sockets, select or: twisted and other file-descriptors & twisted question
by John Benson 30 Nov '03

30 Nov '03

In response to the question about doing serial i/o and using a select statement, I'd like to quote from http://www.python.org/doc/current/lib/module-select.html select(iwtd, owtd, ewtd[, timeout]) This is a straightforward interface to the Unix select() system call. The first three arguments are lists of `waitable objects': either integers representing file descriptors or objects with a parameterless method named fileno() returning such an integer. The three lists of waitable objects are for input, output and `exceptional conditions', respectively. Empty lists are allowed, but acceptance of three empty lists is platform-dependent. (It is known to work on Unix but not on Windows.) The optional timeout argument specifies a time-out as a floating point number in seconds. When the timeout argument is omitted the function blocks until at least one file descriptor is ready. A time-out value of zero specifies a poll and never blocks. The return value is a triple of lists of objects that are ready: subsets of the first three arguments. When the time-out is reached without a file descriptor becoming ready, three empty lists are returned. Among the acceptable object types in the lists are Python file objects (e.g. sys.stdin, or objects returned by open() or os.popen()), socket objects returned by socket.socket(). You may also define a wrapper class yourself, as long as it has an appropriate fileno() method (that really returns a file descriptor, not just a random integer). Note: File objects on Windows are not acceptable, but sockets are. On Windows, the underlying select() function is provided by the WinSock library, and does not handle file desciptors that don't originate from WinSock. (end quote) So, select might not yet work on Windows serial ports as well as sockets. This is also a subject of interest to me, but all I can think of is handling the sockets via select() and polling periodically for data on the serial port using callLater() and some win32 calls. Maybe the win32 serial port handling could even be wrapped in a 'waitable object' as described above for use with the Python select() call. I recall reading somewhere that the twisted framework has the ability to handle serial communications in connection with Global Positioning System device interaction, but don't have any information about it. I'm going to post this to the twisted mailing list : Question for twisted folks: How can I add serial Windows serial port communications as a twisted protocol? Please cross-post back to the python-list.

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[Twisted-Python] python-interfaces mailing list
by Christopher Armstrong 30 Nov '03

30 Nov '03

I just set up a new mailing list on twistedmatrix.com to discuss interface/component systems with possible future interest in a SIG for "integrating" (to some extent) existing Interface systems and putting an Interface/component system into python. Even this interest is controversial, though, I think it's mostly my own ;-) You can subscribe at http://twistedmatrix.com/cgi-bin/listinfo/python-interfaces And that page has a link to archives containing the few messages which have been posted so far. -- Twisted | Christopher Armstrong: International Man of Twistery Radix | Release Manager, Twisted Project ---------+ http://radix.twistedmatrix.com/

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[Twisted-Python] log irc bot example problem
by Robert Penz 30 Nov '03

30 Nov '03

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi! I'm playing with the twisted irclogbot example .. I've no problem in the ircnet, but it I always get disconnected from the efnet, but a eggdrop on the same machine has no problem [21:34:05] [connected at Thu Nov 27 21:34:05 2003] [21:34:51] [disconnected at Thu Nov 27 21:34:51 2003 reason([Failure instance: Traceback: twisted.internet.error.ConnectionDone, Connection was closed cleanly. ])] I've looked at it with tcpdump and got following, but what should that tell me: NICK bla! NOTICE AUTH :*** Looking up your hostname. USER bla! foo bar :None NOTICE AUTH :*** Checking Ident NOTICE AUTH :*** Found your hostname NOTICE AUTH :*** Got Ident response :efnet.demon.co.uk 432 * rim! :Erroneous NERROR :Closing Link: mydnsname.com - -- Regards, Robert - ---------- Robert Penz robert dot penz at outertech dot com -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.2-rc1-SuSE (GNU/Linux) iD8DBQE/xmWB8tTsQqJDUBMRApfXAJ0a5qB4qcIm4cX1e1M1qBuQY7femACfby7W DLQgXXnZXNiJanDLBA9VxK0= =D0R7 -----END PGP SIGNATURE-----

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[Twisted-Python] using twisted web server as a type of REST server
by Oliver Nelson 30 Nov '03

30 Nov '03

Reading the docs on the twisted web server I see that it automatically handles object publishing. But what if I want to respond to requests that aren't based on a object structure? IOW: Client does a GET on: localhost/infodir/subdir/doc.txt in this case infodir, subdir, and doc.txt would actually be info to lookup in a database on the fly, no object structure. Is this possible? I hope I'm explaining myself ok... Thanx for any ideas, OLIVER P.S. I'm looking at TWISTED because it supports DB connection pooling.

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[Twisted-Python] no reponse from mktap on windows
by Kevin Unger 29 Nov '03

29 Nov '03

I just downloaded twisted 1.1.0 forWindows and I get no response from mktap: python %TWISTEDSCRIPTS%\mktap.py web --help What am I doing wrong? thanks, -k Kevin Unger MobileWare, Inc. kevin(a)mobilewareinc.com 707-769-7441 707-364-1176 (cell)

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[Twisted-Python] PyProtocols 0.9.1 Released
by Phillip J. Eby 28 Nov '03

28 Nov '03

What is PyProtocols? -------------------- PyProtocols is an extended implementation of PEP 246, adding a new "declaration API" that lets you easily define your own interfaces and adapters, and declare what adapters should be used to adapt what types, objects, or interfaces. Using PyProtocols, you can easily make flexible frameworks that you or other developers can extend without needing to modify the base framework. PyProtocols interfaces can interoperate with those of Twisted and Zope, or can be used entirely standalone. PyProtocols may be used, modified, and distributed under the same terms and conditions as Python or Zope. What's new in version 0.9.1? ---------------------------- * Implemented Samuele Pedroni's "subproto" idea (see http://mail.python.org/pipermail/python-dev/2003-June/036242.html) as the new 'protocolForType()' API. * Added other APIs to automatically generate protocols, such as 'protocolForURI()', 'sequenceOf()', and 'Variation()'. * Compatible with Zope X3 Milestone 4, Python 2.3.2, and Twisted 1.1.0. (Also runs on Python 2.2.2+, if you don't need Zope 3 compatibility.) * New 'Adapter' and 'StickyAdapter' convenience base classes * Fixes for compatibility with 'ExtensionClass', and for a memory leak in the optional C "speedups" module PyProtocols Resources --------------------- * Detailed Changes since the 0.9 release: http://peak.telecommunity.com/protocol_api/CHANGES.txt.html * Release notes, installation instructions, and browsable API docs: http://peak.telecommunity.com/protocol_api/ * Source and Binary Releases: http://peak.telecommunity.com/dist/ * Reference Manual (HTML): http://peak.telecommunity.com/protocol_ref/module-protocols.html * Reference Manual (PDF): http://peak.telecommunity.com/protocol_ref.pdf * Browsable CVS Repository: http://cvs.eby-sarna.com/PyProtocols/

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Twisted November 2003