Mailman 3 October 2004 - Twisted

Re: [Twisted-Python] Has anybody integrated multiple threadpools into reactor?
by Ames Andreas (MPA/DF) Oct. 21, 2004

Oct. 21, 2004

Hello, thanks for the hint. Glyph Lefkowitz wrote: > I would strongly recommend against using ThreadPool. Just use > callInThread - there is already a pool of worker threads. Starting > and stopping threadpools with the reactor is difficult to test and > easy to get wrong. Could you elaborate a bit on that? I have the situation that I have to wrap two C-libs which are essentially wrappers around proprietary protocols. They use blocking networked calls so that I'll want to … [View More]

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[Twisted-Python] Has anybody integrated multiple threadpools into reactor?
by Ames Andreas (MPA/DF) Oct. 20, 2004

Oct. 20, 2004

Hello, if so, could you point me in the right direction? Furthermore: Is there an easy way to avoid the threadpool overhead when I actually only want to have one dedicated thread to fulfill a blocking job? TIA, andreas

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[Twisted-Python] Threaded Twisted?
by Stefan Behnel Oct. 20, 2004

Oct. 20, 2004

Hi! I wondered what would be the best way of running Twisted on a multi-processor system. I can run multiple instances of my program, but the message passing between them becomes somewhat more expensive than I would like (serialization). Can Twisted run in multiple Threads? Meaning: use two concurrent reactors? As far as I understand it, the reactor is implemented as a singleton, but since different reactor types are already supported, I wonder if anyone could think of a way of … [View More]

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[Twisted-Python] [PATCH] Support resolving wildcard A and CNAME records in twisted.names
by David Reid Oct. 20, 2004

Oct. 20, 2004

Included is a patch to resolve A and CNAME records of the form A('*.foo.bar', '1.2.3.4') CNAME('*.foo.bar', 'foo.bar') This would be useful for example, in a situation where you have many named (even dynamic) virtual hosts handled by a webserver. The patch includes tests for both Wildcard A Records, and Wildcard CNAME Records. Any comments are appreciated. If no one (read: exarkun) disapproves I'll go ahead and commit this.

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[Twisted-Python] Query output from pyPgSQL via Perspective Broker, how?
by Nicola Larosa Oct. 20, 2004

Oct. 20, 2004

This is a pyPgSQL-Twisted mixed question, I post it here because I recently saw Gerard Haering posting, hi Gerard. :-) I'm trying to remotely send the PostgreSQL query output from pyPgSQL via Perspective Broker, and finding it difficult to prevent all the InsecureJelly exceptions. I'm trying to avoid modifying hundreds of already written queries, and I'm patching pyPgSQL instead (albeit at runtime). A first problem is that the make_PgResultSetClass factory function dinamically builds a … [View More]

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[Twisted-Python] Oops ...
by Sergio Trejo Oct. 19, 2004

Oct. 19, 2004

Sorry, my response to Thomas about Flumotion's announcement was meant to go to him only and I accidentally posted to the list (realizing it was too late after clicking send). Serg _________________________________________________________________ Express yourself instantly with MSN Messenger! Download today it's FREE! http://messenger.msn.com/

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RE: [Twisted-Python] First public release of Flumotion Streaming MediaServer
by Sergio Trejo Oct. 19, 2004

Oct. 19, 2004

This looks quite interesting. What about streaming MPEG4? Cheers, Sergio >From: Thomas Vander Stichele <thomas(a)apestaart.org> >Reply-To: Twisted general discussion <twisted-python(a)twistedmatrix.com> >To: Twisted general discussion <twisted-python(a)twistedmatrix.com> >Subject: [Twisted-Python] First public release of Flumotion Streaming >MediaServer >Date: Tue, 19 Oct 2004 22:06:56 +0200 > >Hey everyone, > >we finally bit the bullet and … [View More]

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[Twisted-Python] First public release of Flumotion Streaming Media Server
by Thomas Vander Stichele Oct. 19, 2004

Oct. 19, 2004

Hey everyone, we finally bit the bullet and threw out our firstborn for public consumption. For those not yet in the know, Flumotion is a streaming media server based on GStreamer and Twisted under development by Fluendo. This release gives users access to the basic features of the server and demonstrates its distributed capabilities. We will follow up with a release within a couple of weeks to address some of the remaining issues and fix items that our users discover. Yes, there will be … [View More]

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[Twisted-Python] Is there any ready-made solution for nonblocking logfiles?
by Ames Andreas (MPA/DF) Oct. 19, 2004

Oct. 19, 2004

Hello, subject contains the whole question, apart from: Does it work on Micros~1 platforms? TIA, andreas

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[Twisted-Python] ANN: Fusion 0.1.1
by Itamar Shtull-Trauring Oct. 18, 2004

Oct. 18, 2004

Fusion, a C++ integration layer for Twistedm now has a 0.1.1 release, fixing a serious bug in the buffering layer. http://itamarst.org/software/fusion-0.1.1.tar.gz -- Itamar Shtull-Trauring http://itamarst.org

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[Twisted-Python] why tests are failing with the gtk2 reactor + oldtrial but passing with newtrial
by Jonathan Simms Oct. 18, 2004

Oct. 18, 2004

in a nutshell, oldtrial leaves the reactor in a dirty state in the gtk2 reactor i put in the follwing method: def printoutallreaders(self): for reader in reads.keys(): print "reader: %r" % reader in twisted.test.test_internet.InterfaceTestCase.testCallInNextIteration i added the following line (278): 277 reactor.callLater(0, f1) 278 reactor.printoutallreaders() upon running the test along with the whole suite i got the following output from my … [View More]

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[Twisted-Python] twisted.internet and IPv6
by Stefan Behnel Oct. 18, 2004

Oct. 18, 2004

Hi! I'm curious: how much work would it be to enable IPv6 support in twisted.internet? When I do --------------------------------------- cd twisted/internet fgrep INET *.py --------------------------------------- I get a number of references to IPv4 that make me believe that t.i.* is not quite IPv6 clean by itself: --------------------------------------- default.py: server = socket.socket(socket.AF_INET, socket.SOCK_STREAM) default.py: client = socket.socket(socket.AF_INET, … [View More]

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[Twisted-Python] new to twisted
by m. smadi Oct. 18, 2004

Oct. 18, 2004

hi; i was writing third party sip call controller when a friend suggested i use twisted. I think it will save me a lot of time, but i had trouble with the following when installing: cvs the pserial and pcrypto required package. the cvs server complians about a wrong password (any hints) i continued without these package and installed using setup.py. Where is a good place to start (the tutorial provided is not really very great) - any other suggestions? moe smadi

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[Twisted-Python] UDP multicasting? HowTo?
by Artūras Šlajus Oct. 16, 2004

Oct. 16, 2004

Hello, At first I want to say, that I'm pretty new to Twisted and these classes get me lost (functional programming veteran :-)). Anyway, I started OOP month ago, and I need to write UDP Multicast client/server. What it's for? I want to write Gtk clone of Vypress Chat - serverless chat application. Erm, in fact I want to rewrite it, because I started writing it in Perl :-) So... I looked up API for Multicast and this got my eye: http://twistedmatrix.com/documents/current/api/twisted.internet.… [View More]

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[Twisted-Python] Re: [Twisted-commits] r12007 - Trial has been born anew, with appealing new features, and faster execution
by exarkun＠divmod.com Oct. 16, 2004

Oct. 16, 2004

On Fri, 15 Oct 2004 15:23:56 -0600, Jonathan Simms <slyphon(a)wolfwood.twistedmatrix.com> wrote: >Author: slyphon > Date: Fri Oct 15 15:23:56 2004 > New Revision: 12007 > > Log: > Trial has been born anew, with appealing new features, and faster execution > Revert, please. Every build slave is failing at least one test. It looks like retrial might be ready with a bit more work, but it isn't yet. Jp

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[Twisted-Python] How to stuff new events into the core event loop?
by Ames Andreas (MPA/DF) Oct. 15, 2004

Oct. 15, 2004

Hello all, I'm pretty new to twisted activity (just some doc and code reading so far). So please be forbearing if the answers to the following questions are obvious. I'm wrapping some C library which implements some networked client to use it from python, i.e. from a twisted app. Within the guts of this lib there is a thread created (i.e. it is normally never seen by python). This thread manages some heartbeat mechanism. I, as a user of this API, can register a callback with the lib. … [View More]

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[Twisted-Python] Making database-code Twisted-friendly
by Thomas Weholt Oct. 14, 2004

Oct. 14, 2004

Hi, Attached is a database-module I've created and used quite a lot and so far been very happy with. The problem is that it's not Twisted-compatible at all. It blocks and I need something light in my current project to merge a lot of data from one database into another and I'd like to use this library to do it. Perhpas somebody can have use for it as well?? My ideal form of working with databases is shown in the README.txt file. I'd like to be able to something similar using Twisted in the … [View More]

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[Twisted-Python] Twisted in Python STDLIB?
by Ed Suominen Oct. 14, 2004

Oct. 14, 2004

I'd like to start a discussion on whether Twisted ought to be a part of Python's standard library. I understand some of the developers think it should not, but I personally don't like seeing far inferior networking code sitting there in stdlib. Inclusion in the stdlib carries an implied endorsement, and that endorsement should be going to Twisted, in my view. Has Guido et al. ever expressed any viewpoint on Twisted? It is certainly very Pythonic, and though I have only limited Python and … [View More]

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[Twisted-Python] Merging databases the Twisted way
by Thomas Weholt Oct. 13, 2004

Oct. 13, 2004

Hi, I got a server running a SQLite-database. Sometimes I need to merge data from another SQLite database into the master. So far I've done blocking old-style read-some from source, write-some to destination stuff using the standard pysqlite-database module, but as mentioned, it blocks the server. AFAIK SQLite only allows one connection to the database as well so that might make it harder to implement a non-blocking solution. If anybody has tips/hints or examples directly related to this or … [View More]

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[Twisted-Python] Atop questions
by Guy Robinson Oct. 13, 2004

Oct. 13, 2004

I posted this to Divmod mailing list, but perhaps that's not the right place for these sort of questions? Hello, I've just started to play around with Atop. I'm wanting to store data on what could get up to 500,000 unique products. The structure of the data for each item is the same or similar. There will be references between data in different products. Frequent querying of products will occur from the client application. Should I use nested Pools or, SubStores and Pools/items within each … [View More]

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[Twisted-Python] changing password remotely with twisted.conch
by jean-marc.pouchoulon＠ac-montpellier.fr Oct. 13, 2004

Oct. 13, 2004

Hi, Due to specificity of passwd command, I am not sure it's a goof idea to do that but I try to change the root password on remote machine as I can do it with pexpect The program seems to wait for a password's confirmation. 2004/10/12 13:05 CEST [SimpleTransport,client] starting service ssh-connection 2004/10/12 13:05 CEST [SimpleTransport,client] opening channel 0 with 65536 32768 2004/10/12 13:05 CEST [SimpleTransport,client] sending request for channel 0, request exec 2004/10/12 13:… [View More]

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[Twisted-Python] Re: [twisted+wxPython] widgets do not work?
by exarkun＠divmod.com Oct. 12, 2004

Oct. 12, 2004

On Tue, 12 Oct 2004 19:58:38 +0200, Taki Jeden <bartekgorny(a)interia.pl> wrote: > > Hi > > Anybody used wxPython with twisted? > > I started putting together a Twisted-based app with wx GUI, and the widgets > just don't work - some controls do not show up etc. - at least on my > system. > > For example, if I just take the wxdemo.py shipped with Twisted, and add to > it a static text, it doesn't show - while if I change > reactor.… [View More]

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RE: [Twisted-Python] Twisted in Python STDLIB?
by Sergio Trejo Oct. 12, 2004

Oct. 12, 2004

Interesting idea, especially when event-based programming is starting to get more attention in the Java world. See this article posted by Cnet today: http://news.com.com/A+new+event+in+programming/2100-1007_3-5406253.html Serg >From: Ed Suominen <general(a)eepatents.com> >Reply-To: Twisted general discussion <twisted-python(a)twistedmatrix.com> >To: twisted-python(a)twistedmatrix.com >Subject: [Twisted-Python] Twisted in Python STDLIB? >Date: Mon, 11 Oct 2004 11:… [View More]

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[Twisted-Python] The Anything Box
by William la Forge Jr Oct. 11, 2004

Oct. 11, 2004

Woops! I forgot to mention the URL: http://compstrm.sourceforge.net Also, here's a snippet from that page describing the project a little better: The Anything Box This is a new kind of database. You can put anything into it, and make any kind of query to access its contents. It works with structures and complexes of structures using very scalable technology. And you can view current state, past state, and changes over time. It is an extensible system that begins with a rich set of metadata … [View More]for describing data and operations, with operations and data properties grouped into capabilities, which in turn are used to construct data types. The database is implemented over BSDDB, a transactional store that is also used by MySQL, using 14 b-tree files to support a wide range of queries. The basic storage element is (time, fileid, propertyid, oldValue, newValue), but with additional support for document storage. The property/value pairs assigned to a file for a given time are then computed based on a reverse-chronological extraction process. This Anything Box is fully integrated with Twisted, a fast asynchronous server that supports both a web server and a very wide range of additional protocols. The Anything Box itself is implemented using coroutines, making the code more readable/maintainable than most asynchronous styles. It is this coroutine technology, implemented as a computational stream, that the CompStrm project name came from. User Process Management All user processes are coroutines, implemented for fast response rather than throughput. Process management is handled through flow control, with processes automatically terminated when no more output is desired. Any process can interact with its user; loosely coupled (background) processes will be implemented to pend when user input is requested. Persistent Garbage Collection Without some form of garbage collection, applications become much more complex--especially when dealing with complex structures. Unfortunately, garbage collection normally applies only to in-memory (non-persistent) structures. The Anything Box implements persistent garbage collection by using two different kinds of organization. First, data is organized into directories based on data type, each directory having an associated descriptor defining the type and its capabilities. Some data types are then identified as well-known (protected) and are not subject to garbage collection. A second organization is by groups. Data elements with the member capability are always tagged with the id of the id of the lead data element for their group. References to a data element (from another element) are identified as either weak or strong (non-weak). And when a strong reference to a data element from another in the same group is destroyed, then the previously referenced data element is a potential candidate for automatic garbage collection--as all members of a group must be strongly referenced by another element in the same group. (This of course places a design constraint on applications, that weak references be used to avoid any strong cyclic references.) The TKI Shell While the base-level operations are implemented in Python coroutines, the Anything Box includes the TKI shell. TKI commands are operations defined by the Anything Box, which in turn may be implemented as either Python coroutines or TKI scripts. The shell itself is quite simple, supporting argument passing to scripts, the assignment of property values to script variables, and environment variables for navigating space and time and for generating unique names. The richness of the TKI shell comes from the numerous operations defined by the Anything Box, which includes support for set values, lists and dictionaries, and for invoking (mapping) an operation over the contents of a set, list or dictionary. [View Less]

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[Twisted-Python] The Anything Box
by William la Forge Jr Oct. 11, 2004

Oct. 11, 2004

A quick update on my twisted project: This is a new kind of database. You can put anything into it, and make any kind of query to access its contents. And you can view current state, past state, and changes over time. This project builds on BSDDB and is fully integrated with Twisted. Thankyou, Bill la Forge

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