Mailman 3 April 2009 - Twisted

[Twisted-Python] One of a kind Gucci reps
by Hope Rios April 22, 2009

April 22, 2009

So you thought owning a brand name watch was out of your reach? Think again! http://www.wofovaxuc.cn Diam0nd Reps has it all: Rolex, Cartier, Tag Heuer, Breitling, and many more, for a fraction of the price of an original watch. And don't forget: when you order two watches, you get an extra 15 percent discount over our already low prices! http://www.wofovaxuc.cn With so many watches that look and work like the real thing, I guarantee you'll have a delicious time finding yours at our store!

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[Twisted-Python] _Win32Waker
by Aron Bierbaum April 21, 2009

April 21, 2009

I have been using a custom Qt4 reactor that derives from PosixReactorBase. As a result it creates a _Win32Waker to allow threads and signals to wake up the IO thread. It seems though that the current implementation only works about half of the time. The other half it exists with : File "...\Lib\python2.6\site-packages\twisted\internet\posixbase.py", line 170, in __init__ ReactorBase.__init__(self) File "...\Lib\python2.6\site-packages\twisted\internet\base.py", line 424, in __init__ … [View More]

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com April 19, 2009

April 19, 2009

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[Twisted-Python] Writing a shutdown command that sends an ACK back
by Rutt, Benjamin April 15, 2009

April 15, 2009

Is there a good way, in, say, a LineReceiver based server, to implement a bit of code in lineReceived() that, if you receive a line like, let's say, 'shutdown' from a client, you can call: 1) self.transport.write('goodbye\n') # send a goodbye message to the client And then call 2) self.transport.close() # close the client's socket And then 3) reactor.stop() # terminate the server The problem I'm finding is that since I believe self.transport.write() enqueues the writing for later, and … [View More]

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[Twisted-Python] Can't quit a Tkinter application on MacOS X when using Twisted; fix? workaround?
by Russell E. Owen April 15, 2009

April 15, 2009

I am trying to convert a cross-platform Python/Tkinter application to use Twisted and have run into a problem: at least on MacOS X I can no longer quit the application. I have appended a minimal script showing the problem. This is probably not an issue on unix and WIndows because I find I have to add my own Quit menu item anyway, so I can make it do what I like. But on MacOS X with Aqua Tcl/Tk that item is added by the system and its meaning appears to be hard-wired -- I suspect to it … [View More]

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[Twisted-Python] Ldaptor for a simple python LDAP server
by Alex Davies April 15, 2009

April 15, 2009

Hi, I'm looking to write a very simple LDAP server in Python. I want to hard code the few attributes that I have, and make them available to clients. I am not the worlds most able programmer, but have looked at the code, documentation and talks about Ldaptor and it seems that this can do what I need - but I can't find any examples anywhere! Is there a simple example that shows me what is needed to build a super-simple LDAP server in Python? Any pointers from the more able would be much … [View More]

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[Twisted-Python] ANNOUNCING Tahoe-LAFS v1.4
by zooko April 14, 2009

April 14, 2009

ANNOUNCING Tahoe, the Least-Authority Filesystem, v1.4 The allmydata.org team is pleased to announce the release of version 1.4.1 of "Tahoe", the Lightweight-Authorization Filesystem. This is the first release of Tahoe-LAFS which was created solely as a labor of love by volunteers -- it is no longer funded by allmydata.com (see [1] for details). Tahoe-LAFS is a secure, decentralized, fault-tolerant cloud storage system. All of the source code is publicly available under Free Software, Open … [View More]Source licences. This filesystem is distributed over multiple servers in such a way the filesystem continues to operate correctly even when some of the servers are unavailable, malfunctioning, or malicious. Here is the one-page explanation of Tahoe's unique security and fault-tolerance properties: http://allmydata.org/source/tahoe/trunk/docs/about.html This is the successor to Tahoe-LAFS v1.3, which was released February 13, 2009 [2]. This is a major new release, adding garbage collection, improved diagnostics and error-reporting, and fixing a critical performance problem when downloading large (many GB) files. See the NEWS file [3] and the known_issues.txt file [4] for more information. Besides the Tahoe core, a crop of related projects have sprung up, including frontends for Windows and Macintosh, two front-ends written in JavaScript, a Ruby interface, a plugin for duplicity, a plugin for TiddlyWiki, a new backup tool named "GridBackup", CIFS/SMB integration, an iPhone app, and three incomplete frontends for FUSE. See the Related Projects page on the wiki: [5]. COMPATIBILITY Tahoe v1.4 is fully compatible with the version 1 series of Tahoe. Files written by v1.4 clients can be read by clients of all versions back to v1.0. v1.4 clients can read files produced by clients of all versions since v1.0. v1.4 servers can serve clients of all versions back to v1.0 and v1.4 clients can use servers of all versions back to v1.0. This is the fifth release in the version 1 series. The version 1 series of Tahoe will be actively supported and maintained for the forseeable future, and future versions of Tahoe will retain the ability to read files and directories produced by Tahoe v1 for the forseeable future. The version 1 branch of Tahoe is the basis of the consumer backup product from Allmydata, Inc. -- http://allmydata.com . WHAT IS IT GOOD FOR? With Tahoe, you can distribute your filesystem across a set of servers, such that if some of them fail or even turn out to be malicious, the entire filesystem continues to be available. You can share your files with other users, using a simple and flexible access control scheme. Because this software is new, we do not categorically recommend it as the sole repository of data which is extremely confidential or precious. However, we believe that erasure coding, strong encryption, Free/Open Source Software and careful engineering make Tahoe safer than common alternatives, such as RAID, removable drive, tape, "on-line storage" or "Cloud storage" systems. This software comes with extensive tests, and there are no known security flaws which would compromise confidentiality or data integrity. (For all currently known issues please see the known_issues.txt file [3].) This release of Tahoe is suitable for the "friendnet" use case [6] -- it is easy to create a filesystem spread over the computers of you and your friends so that you can share disk space and files. LICENCE You may use this package under the GNU General Public License, version 2 or, at your option, any later version. See the file "COPYING.GPL" [7] for the terms of the GNU General Public License, version 2. You may use this package under the Transitive Grace Period Public Licence, version 1 or, at your option, any later version. (The Transitive Grace Period Public Licence has requirements similar to the GPL except that it allows you to wait for up to twelve months after you redistribute a derived work before releasing the source code of your derived work.) See the file "COPYING.TGPPL.html" [8] for the terms of the Transitive Grace Period Public Licence, version 1. (You may choose to use this package under the terms of either licence, at your option.) INSTALLATION Tahoe works on Linux, Mac OS X, Windows, Cygwin, and Solaris, and probably most other systems. Start with "docs/install.html" [9]. HACKING AND COMMUNITY Please join us on the mailing list [10]. Patches are gratefully accepted -- the RoadMap page [11] shows the next improvements that we plan to make and CREDITS [12] lists the names of people who've contributed to the project. The wiki Dev page [13] contains resources for hackers. SPONSORSHIP Tahoe was originally developed thanks to the sponsorship of Allmydata, Inc. [14], a provider of commercial backup services. Allmydata, Inc. created the Tahoe project, and contributed hardware, software, ideas, bug reports, suggestions, demands, and money (employing several Tahoe hackers and instructing them to spend part of their work time on this Free Software project). Also they awarded customized t-shirts to hackers who find security flaws in Tahoe (see http://hacktahoe.org ). After discontinuing funding of Tahoe R&D in early 2009, Allmydata, Inc. has continued to provide servers, co-lo space and bandwidth to the open source project. Thank you to Allmydata, Inc. for their generous and public-spirited support. Zooko Wilcox-O'Hearn on behalf of the allmydata.org team Special acknowledgment goes to Brian Warner, whose superb engineering skills and dedication are primarily responsible for the Tahoe implementation, and significantly responsible for the Tahoe design as well, not to mention most of the docs and tests and many other things besides. April 13, 2009 Boulder, Colorado, USA [1] http://allmydata.org/pipermail/tahoe-dev/2009-March/001461.html [2] http://allmydata.org/trac/tahoe/browser/relnotes.txt?rev=3620 [3] http://allmydata.org/trac/tahoe/browser/NEWS?rev=3835 [4] http://allmydata.org/trac/tahoe/browser/docs/known_issues.txt [5] http://allmydata.org/trac/tahoe/wiki/RelatedProjects [6] http://allmydata.org/trac/tahoe/wiki/UseCases [7] http://allmydata.org/trac/tahoe/browser/COPYING.GPL [8] http://allmydata.org/source/tahoe/trunk/COPYING.TGPPL.html [9] http://allmydata.org/source/tahoe/trunk/docs/install.html [10] http://allmydata.org/cgi-bin/mailman/listinfo/tahoe-dev [11] http://allmydata.org/trac/tahoe/roadmap [12] http://allmydata.org/trac/tahoe/browser/CREDITS?rev=3758 [13] http://allmydata.org/trac/tahoe/wiki/Dev [14] http://allmydata.com --- Tahoe, the Least-Authority Filesystem -- http://allmydata.org store your data: $10/month -- http://allmydata.com/?tracking=zsig I am available for work -- http://zooko.com/résumé.html [View Less]

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[Twisted-Python] Basic factory question
by Ted Pederson April 13, 2009

April 13, 2009

Coming from C++ to python/twisted. Looking at samples, created a simple server and want to create a tester file that will create many clients to connect to and exercise my server. All very nice and easy and like this a lot so far. The one thing that looks strange to me is that the samples instantiate a ClientFactory to then connect to the server via reactor.connectTCP(). I copied this pattern, worried that a factory would be created for every one of my clients, and this is indeed what … [View More]

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[Twisted-Python] Documentation overviews
by Cary Hull April 13, 2009

April 13, 2009

Hi folks, One of the goals for the Pycon sprint was to develop user oriented overviews for existing documentation. These would ideally guide users through everything they would need to read in order to accomplish a desired goal with Twisted. I've formulated the following 'track' suggestions based on a conversation in the sprint room a few nights ago. Feedback would be greatly appreciated. --- Overviews # The basics of event driven applications (beginner) # No hand holding, just the … [View More]

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[Twisted-Python] adapt from more than one interface
by Esteve Fernandez April 13, 2009

April 13, 2009

Hi all. I have a bunch of services, which implement a set of interfaces, and I use a bunch of adapters to turn them into factories, making those services protocol-independent. The interface/adapter stuff works great and I'm able to expose those services to several protocols, without changing a single line in them. However, some of the protocols need some extra information to be passed, so I have to do this: factory = IFooFactory(myService) factory.bar = "some value" it works, but I'd … [View More]

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Re: [Twisted-Python] Giving inlineCallbacks-wrapped functions access to the deferred their wrapper will return
by Terry Jones April 12, 2009

April 12, 2009

>>>>> "glyph" == glyph <glyph(a)divmod.com> writes: glyph> When I write functions that take a Deferred I typically have them glyph> return a Deferred as well, to avoid this, and other syntactic glyph> nuisances. Would you consider the following more elegant? Yes. And thanks for the rule of thumb. In any case, I realized that my original idea wont work. _inlineCallbacks returns the deferred to the caller of the wrapped function early. The caller could add … [View More]

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com April 12, 2009

April 12, 2009

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[Twisted-Python] Giving inlineCallbacks-wrapped functions access to the deferred their wrapper will return
by Terry Jones April 12, 2009

April 12, 2009

This will probably fall into the too-weird or too-infrequent to be worth implementing category, but I think it's worth mentioning. (BTW, none of the following code has been run.) When you write a normal function that returns a deferred, it (of course) has access to the deferred it's going to return: def func(): d = defer.Deferred() d.addCallback(...).addErrback(...) callSomethingElse(d) return d Apart from operating on the deferred itself, func can pass … [View More]

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[Twisted-Python] Plugin startup and shutdown actions
by luper rouch April 12, 2009

April 12, 2009

I would like to port my Application API based services to the twistd plugin interface, to be able to retrieve command line options. In the existing services, I reimplemented t.a.s.MultiService startService() and stopService() to do some actions at startup and shutdown. How can I do this in a plugin ? -- Lup

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Re: [Twisted-Python] Plugin startup and shutdown actions
by Terry Jones April 11, 2009

April 11, 2009

Hi Luper >>>>> "luper" == luper rouch <luper.rouch(a)gmail.com> writes: luper> I have a last question, I put my plugins in a 'twisted/plugins' luper> subfolder of my project, and running them from the command line luper> works fine. How can I invoke them in unit tests (I need to be able luper> to start and stop them), since the plugin files are not in a luper> package? I suspect some will answer "Uh, you probably shouldn't be doing that"... But something … [View More]

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[Twisted-Python] Two-way telnet client problem
by Greg Taylor April 11, 2009

April 11, 2009

Hello all, I'm still pretty new with Twisted, so the documentation is a little bit cryptic and strange to wade through. I'm writing a MUD server that I'd like to add InterMUD Protocol (IMC) to. This basically allows any of the games running the MUD server to connect to an IMC server that lets players from other games talk to one another. I'm thinking I'll create another thread and run the IMC client from there so as to not block the main server thread. I've started tinkering with how to get … [View More]

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Re: [Twisted-Python] Fork/Spawn children to accept connections on the same port.
by Eric York April 11, 2009

April 11, 2009

> > From: Jean-Paul Calderone <exarkun(a)divmod.com> > Date: April 10, 2009 8:57:19 AM PDT > To: Twisted general discussion <twisted-python(a)twistedmatrix.com> > Subject: Re: [Twisted-Python] Fork/Spawn children to accept > connections on the same port. > Reply-To: Twisted general discussion <twisted- > python(a)twistedmatrix.com> > > > On Mon, 6 Apr 2009 15:25:39 -0700, Eric York <eyork(a)apple.com> wrote: >> I am trying to get … [View More]

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[Twisted-Python] PBClientFactory and getRootObject
by Fabrizio Mancini April 10, 2009

April 10, 2009

Hi everyone, I'm writing a server and a client using Perspective Broker with no Avatar and no auth. The server accumulates some data using a DeferredQueue. The clients using a remote call retrieve one item per time from the queue and elaborates it making some changes on a database using adbapi. What i want to know is: 1) how can i recursively call the remote method to retrieve the items from the server? 2) can i defer the database operations to a thread so every client can elaborates multiple … [View More]requests per time? The code i'm using is this: from twisted.internet import reactor, defer, pb from twisted.enterprise import adbapi from twisted.python import log import os globalConfigurationFile=os.path.abspath('conf' + os.sep + 'configuration.ini') class DataBasePreparerClient(object): ''' DataBasePreparerClient() ''' def __init__(self, globalConfigurationFile): self._gcf = globalConfigurationFile self.data = {} self._parseConfig() self._createDbPool() self.d = defer.Deferred() self.clientfactory = pb.PBClientFactory() def _createDbPool(self): self.dbpool = adbapi.ConnectionPool('cx_Oracle', self.data['db_username'], self.data['db_password'], self.data['db_tns']) def connect(self): reactor.connectTCP(self.data['server_ip'], self.data['server_port'], self.clientfactory) self.d = self.clientfactory.getRootObject() self.dbpool.connect() self.d.addCallbacks(self.get_item, self._eb) def _eb(self, reason): print "Failure: ", reason.getErrorMessage() def get_item(self, result): d = result.callRemote("get_item") d.addCallback(self.got_item) def got_item(self, item): query = "update table where ..." res = self.dbpool.runOperation(query) res.addErrback(self._eb) self.d = self.clientfactory.getRootObject() self.d.addCallbacks(self.get_item, self._eb) if __name__ == "__main__": DataBasePreparerClient(globalConfigurationFile).connect() reactor.run() To call recursively the remote object in function connect i call clientfactory.getRootObject() and addCallback() for the first time, and the i recall always self.clientfactory.getRootObject() and self.d.addCallback when the db query has completed. Is this correct? Do I have to always call self.clientfactory.getRootObject() every time i have to call a remote method? Can i deferToThread the function got_item or self.dbpool.runOperation(query)? Thanks in advance Fabrizio [View Less]

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[Twisted-Python] adbapi and long-running transactions
by Wolfgang Powisch (privat) April 10, 2009

April 10, 2009

Hi, I'm using twisted.enterprise.adbapi for non-blocking database interaction with a postgres database. Currently I'm only using runQuery or runOperation for running single queries or some own little helper methods "runQueries" or "runOperations" for running multiple queries within one Transaction (using runInteraction). What I need now is to start a Transaction and access this Transaction from multiple callbacks within my application-code in the main-thread. In the last callback (and/or … [View More]

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[Twisted-Python] RE: Question about Descriptors and SelectReactor
by Andrew Francis April 10, 2009

April 10, 2009

Hi Alec and Drew: Thanks for answering my question. From reading an excerpt of Steven's "UNIX Network Programming," it implies that the FD_SETSIZE is defined in the kernel. If you want a bigger FD_SETSIZE, you need to recompile the kernel. At least that is the case in BSD 4.4 UNIX. However I am using Linux. The Twisted documentation is recommending that it may be better to use pollreactor. Cheers, Andrew --- On Tue, 4/7/09, twisted-python-request(a)twistedmatrix.com <twisted-python-… [View More]request(a)twistedmatrix.com> wrote: > From: twisted-python-request(a)twistedmatrix.com <twisted-python-request(a)twistedmatrix.com> > Subject: Twisted-Python Digest, Vol 61, Issue 10 > To: twisted-python(a)twistedmatrix.com > Date: Tuesday, April 7, 2009, 9:00 AM > Send Twisted-Python mailing list > submissions to > twisted-python(a)twistedmatrix.com > > To subscribe or unsubscribe via the World Wide Web, visit > http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python > or, via email, send a message with subject or body 'help' > to > twisted-python-request(a)twistedmatrix.com > > You can reach the person managing the list at > twisted-python-owner(a)twistedmatrix.com > > When replying, please edit your Subject line so it is more > specific > than "Re: Contents of Twisted-Python digest..." > > > Today's Topics: > > 1. RE: Question about Descriptors and > SelectReactor (Alec Matusis) > 2. trac server error (Johann Borck) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Mon, 6 Apr 2009 18:25:45 -0700 > From: "Alec Matusis" <matusis(a)yahoo.com> > Subject: RE: [Twisted-Python] Question about Descriptors > and > SelectReactor > To: "'Twisted general discussion'" <twisted-python(a)twistedmatrix.com> > Message-ID: <009701c9b71f$ca82aac0$5f880040$@com> > Content-Type: text/plain; > charset="utf-8" > > > I would say a function of the operating system - or > specifically > > ulimit on a *nix system. > > I do not think this is correct, on linux: ulimit -n is the > number of fds that can be written/read by a process, but the > 1024 limit on select is actually hard-compiled into the > kernel and can be changed only in the headers with kernel > recompilation. > > > -----Original Message----- > > From: twisted-python-bounces(a)twistedmatrix.com > [mailto:twisted-python- > > bounces(a)twistedmatrix.com] > On Behalf Of Drew Smathers > > Sent: Monday, April 06, 2009 8:40 AM > > To: Twisted general discussion > > Subject: Re: [Twisted-Python] Question about > Descriptors and > > SelectReactor > > > > On Sat, Apr 4, 2009 at 6:04 PM, Andrew Francis <andrewfr_ice(a)yahoo.com> > > wrote: > > > > > > Hi: > > > > > > Perhaps this question has been asked before but > is there a limit to > > the number of descriptors the SelectReactor can > handle? Is this a > > function of the operating system? > > > > > > > I would say a function of the operating system - or > specifically > > ulimit on a *nix system. > > > > -Drew > > > > _______________________________________________ > > Twisted-Python mailing list > > Twisted-Python(a)twistedmatrix.com > > http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python [View Less]

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[Twisted-Python] trac server error
by Johann Borck April 10, 2009

April 10, 2009

there seems to be some serious problem with http://twistedmatrix.com/trac/ this is what the browser shows me on about one third of the requests: Traceback (most recent call last): File "/srv/trac/.local/lib/python2.4/site-packages/trac/web/api.py", line 382, in send_error 'text/html') File "/srv/trac/.local/lib/python2.4/site-packages/trac/web/chrome.py", line 475, in render_template return stream.render(method, doctype=doctype) File "/srv/trac/.local/lib/python2.4/site-packages/… [View More]genshi/core.py", line 146, in render output = u''.join(list(generator)) File "/srv/trac/.local/lib/python2.4/site-packages/genshi/output.py", line 200, in __call__ for kind, data, pos in stream: File "/srv/trac/.local/lib/python2.4/site-packages/genshi/output.py", line 486, in __call__ for kind, data, pos in chain(stream, [(None, None, None)]): File "/srv/trac/.local/lib/python2.4/site-packages/genshi/output.py", line 436, in __call__ for kind, data, pos in stream: File "/srv/trac/.local/lib/python2.4/site-packages/genshi/core.py", line 207, in _ensure for event in stream: File "/srv/trac/.local/lib/python2.4/site-packages/genshi/core.py", line 207, in _ensure for event in stream: File "/srv/trac/.local/lib/python2.4/site-packages/trac/web/chrome.py", line 478, in _strip_accesskeys for kind, data, pos in stream: File "/srv/trac/.local/lib/python2.4/site-packages/genshi/filters.py", line 313, in __call__ for kind, data, pos in stream: File "/srv/trac/.local/lib/python2.4/site-packages/genshi/template.py", line 1145, in _match content = list(content) File "/srv/trac/.local/lib/python2.4/site-packages/genshi/filters.py", line 313, in __call__ for kind, data, pos in stream: File "/srv/trac/.local/lib/python2.4/site-packages/genshi/template.py", line 1120, in _match for event in stream: File "/srv/trac/.local/lib/python2.4/site-packages/genshi/template.py", line 1109, in _strip event = stream.next() File "/srv/trac/.local/lib/python2.4/site-packages/genshi/template.py", line 941, in _eval for event in substream: File "/srv/trac/.local/lib/python2.4/site-packages/genshi/template.py", line 920, in _eval ctxt): File "/srv/trac/.local/lib/python2.4/site-packages/genshi/template.py", line 930, in _eval result = data.evaluate(ctxt) File "/srv/trac/.local/lib/python2.4/site-packages/genshi/eval.py", line 101, in evaluate {'data': data}) File "/home/trac/.local/share/trac/templates/error.html", line 36, in <Expression u"get_reporter_id(req)"> <input type="hidden" name="reporter" value="${get_reporter_id(req)}" /> File "/srv/trac/.local/lib/python2.4/site-packages/trac/util/__init__.py", line 50, in get_reporter_id name = req.session.get('name', None) AttributeError: 'NoneType' object has no attribute 'get' [View Less]

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[Twisted-Python] Fork/Spawn children to accept connections on the same port.
by Eric York April 10, 2009

April 10, 2009

I am trying to get the highest level of performance using all of the processors cores on a server. In the past, a unix app would bind/listen to a socket and then fork or spawn children to accept connections on that socket. I can’t see how to do that in Twisted. Can someone point me in the right direction? The solution of using a single process to accept connections and then farm out work to child processes, while a workable solution, isn’t at the same level of performance as … [View More]

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[Twisted-Python] HTTP Proxy client?
by Alec Flett April 9, 2009

April 9, 2009

Is there any way to make twisted.web.client talk through an HTTP proxy? I don't know enough about http to know if its as simple as opening the connection to the proxy and just including the full URL in the GET line? Alec

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[Twisted-Python] ZeroC Ice + Twisted?
by Einar S. Idsø April 9, 2009

April 9, 2009

Dear listmembers, I have a project that requires me to use ZeroC Ice for communicating with a server application. I would very much like to use Twisted for this project, and am therefore wondering if anyone has any experience with using Twisted with ZeroC Ice? Previous posts on this list have mentioned that ZeroC Ice has asynchronous operations and therefore should be easily twistable, but its Python bindings and type system are unpythonic (Stephen Waterbury, May 30th 2006) . But I haven't … [View More]

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[Twisted-Python] How to hook at StandardIO factory to a twistd app
by akrherz＠iastate.edu April 8, 2009

April 8, 2009

Hi Twisted! Could a kind soul provide me an example of how to connect my StandardIO factory to a twistd app? Here is an overview of my code class MyProtocol(basic.LineReceiver): # Blah Blah class MyFactory( stdio.StandardIO ): def __init__(self, protocol): self.protocol = protocol # then by .tac has application = service.Application("Ingestor") serviceCollection = service.IServiceCollection(application) proto = MyProtocol() factory = MyFactory( proto ) It is not … [View More]

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