Mailman 3 February 2004 - Twisted

[Twisted-Python] More problems running examples
by Phil Hunt 20 Feb '04

20 Feb '04

OK, I've now been able to get the very simplest webserver running. I'm trying something slightly more complex, based on the next example in <Twisted-1.1.1/doc/howto/using-twistedweb.html>. The Hello class given in the exmaple is not a full program: ##################################################################### # teg3.py from twisted.web.resource import Resource class Hello(Resource): def getChild(self, name, request): if name == '': return self return Resource.getChild( self, name, request) def render(self, request): return """<html> Hello, world! I am located at %r. </html>""" % (request.prepath) resource = Hello() ##################################################################### When I run this it exits immediately; I assume this is intentional. I built on the previous example to produce a full program; my code is: ##################################################################### # teg2.py from twisted.web import server, resource from twisted.internet import reactor from twisted.web.resource import Resource class Hello(resource.Resource): def getChild(self, name, request): if name == '': result = self else: result = Resource.getChild(self, name, request) print "in Hello:getChild, result=%r" % (result,) return result def render(self, request): s = """<html> Hello, world! I am located at %r. </html>""" % (request.prepath) return s print "===== Running teg2.py (simple webserver) =====" res = Hello() site = server.Site(res) reactor.listenTCP(8011, site) reactor.run() ##################################################################### Now, this does actually run, however whenever I point my webserver at it, all that comes back is a 404 error with the text: No Such Resource No such child resource. And my program writes to stdout: in Hello:getChild, result=<twisted.web.error.NoResource instance at 0x406adb0c> -- Phil Hunt, phil.hunt(a)tech.mrc.ac.uk

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[Twisted-Python] Twisted and P2P (re: p2p, gnutella)
by RITA Y/O RODRIGO DIAZ Y/O BENENSON 18 Feb '04

18 Feb '04

Hi, I'm working on the Twistification of http://thecircle.org.au/ and in the reparation of the broken http://khashmir.sf.net if you would like to help contact me at the email myname at elo dot utfsm dot cl knowing that myname is rodrigob (I hate spam) TheCircle work is just at his begining (design is made, code is starting, slowly), the khashmir reparation is going fine (but no estimation can be done in debugging, because number of critical bugs is unknown). rodrigob. <twisted-python(a)twistedmatrix.com> > From: stephan <mailinglists(a)shechen.at> > Subject: [Twisted-Python] p2p, gnutella > Reply-To: twisted-python(a)twistedmatrix.com > > > > I am looking forward to add p2p functionality to my app. Does > anybody know > what the current status of twisted's gnutella implementation is? > > There seems to have been a semi-finished implemention in > 1.0.2alpha4 which > I can't find in 1.1.1 anymore. > > I might also be willing to implement missing parts but I would need > to get > a short briefing on how things are. > > thanks, > > _stephan >

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[Twisted-Python] Backup Agent
by David A. Leedom 18 Feb '04

18 Feb '04

OK Guys I Need your help. I own a small computer consulting firm and am struggling with the basic sales and marketing issues. However, I think I have finally stumbled onto a great "no brainer" idea: A Remote Backup Service for Small businesses. Yes I know there are a bunch out their, but I am thinking of the Hundreds of Businesses around my general geographic area who don't know how to find them and who don't backup their data. I would charge a monthly fee for a given amount of space used ( no more than 500 Meg) and provide a software that would backup and restore their data. My dilemma is that my margins would be to small to make it affordable for me to resale someone else's software. So....I would like to roll my own. Python makes a lot of sense for many reasons that I don't need to get into here. My struggle is that although I have been programming since the mid-70s, I am new to Python and feel like a man groping around in the dark. Also being new to Twisted it is like the room is full of chairs as well. I did get some sample code to work over the weekend, but I got a serious brain cramp trying to figure it all out. The basic architecture that I am thinking of is client/server. There would be three basic applications running to make things work. First, would be an Agent program that does most of the work. The Agent would run as a service on each computer being backed up. Second would be a GUI program running locally to control the agents. Finally there would be a "Web Service" that received backup sets from each agent or a designated master agent. The Web Service would handle authentication and other house keeping things. Finally the Question!!!! There are many other details that I have in mind as well (using patches to reduce size, compression, encryption...), but right now I am working on issues related to the communication between the GUI and Agents. Assuming that I have one or more number of agents running on a network I want to do a number of things. 1) Have the GUI request that the agents identify themselves so I don't have to tell the GUI where they are. 2) Transmit a catalog list of the file system to the GUI so I can build a TreeView and pick which files to backup on each computer. 3) Finally I may want to identify a "Master" agent that collects all the backups on the network and transmits them as one session to the Web Service. This would allow for local "On Site" backups for fast restores due to normal computer crashes and failures. 1. What would you guys suggest I do to I get the GUI to ask all the agents to identify themselves? 2. What would be the best approach using twisted to transmit a file system catalog across the local wire. I was playing with some remote procedure calls over the weekend that seemed to work. I am thinking I could create a class that would gather the local file system and send it over the wire as one lump. 3. If I am going to transmit a backup file (<500meg) over the wire to another local computer what is the best Twisted approach to take? Due to WinXP security issues and the desire the run in a cross platform environment I don't want to rely on normal file shares. There are a hundred other questions running though my mind right now, but this will due for now, Thanks for any help you can give, David A. Leedom The Hightower Group, Inc. Custom Software Solutions Designed To Fit Your Business Like A Glove. 165 West Airport Road/Lititz, PA 17543 V:717-560-4002, 877-560-4002 x: 114 F:717-560-2825 www.hightowergroup.com

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[Twisted-Python] Re: [Twisted-web] twisted.internet.error.CannotListenError
by Mary Gardiner 18 Feb '04

18 Feb '04

This looks like a question for twisted-python(a)twistedmatrix.com rather than twisted-web(a)twistedmatrix.com On Sun, Feb 15, 2004, Peter Stradinger wrote: > Hi, > > I'm fairly new to Twisted and trying to get a twisted reactor to work with wxPython. I'm trying > the perspective broker examples, and when I try to do: > def OnFileitems0Menu(self, event): > self.Close(true) > reactor.stop() > > It shuts down the program fine, but then when I try to run it again I get: > > twisted.internet.error.CannotListenError: Couldn't listen on any:8800: (10048, 'Address already in > use'). > > As an error. I can manually stop the process and then it will work again, but I don't know how to > release the port when I shut down the program. > > Am I missing something obvious? A search of the archives hasn't shown me any way out. > > Peter

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[Twisted-Python] Twisted Weekly News #11
by Luc Stepniewski 17 Feb '04

17 Feb '04

==================================================================== Twisted Weekly News #11 ==================================================================== .. contents:: So many announcements and new Twisted based software! This week's TWN (especially because it is merged with previous week) is full of really cool news/articles/software that will keep you busy for at least two months. 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/twn11 The Twisted Weekly News ------------------------- 11th Issue. Tuesday, February 17, 2004 QOTW:: <moshez> Twisted: Just Because It's Not Documented and Unstable Doesn't Mean You Shouldn't Use It Discussions ------------- * http://twistedmatrix.com/pipermail/twisted-python/2003-December/006856.html David Bolen asked if there was a way to keep the references to the remote PB object when a disconnect happened, and reconnect all automatically. Jp Calderone replied (http://twistedmatrix.com/pipermail/twisted-python/2003-December/006869.html) that, in its current shape, it is not possible, because the references are reinitialized when the connection is re-enabled. But he said this would not be too hard to implement. * http://twistedmatrix.com/pipermail/twisted-python/2004-February/007039.html Stephen Waterbury posted a code example on how to interface twisted.cred with a database where the user/pass is stored. A few days later, Stephen posted another example, less trivial, showing web auth against a db, on http://twistedmatrix.com/pipermail/twisted-python/2004-February/007063.html * http://twistedmatrix.com/pipermail/twisted-python/2004-February/007057.html Martin Stenhard asked how to get the remote ip address of a connecting client, if the connection is made using PB. * http://twistedmatrix.com/pipermail/twisted-python/2004-February/007074.html David A. Leedom asked for some advice on how he should design a remote backup architecture using Twisted. Michal Pasternak replied that he should pay a lot of attention on the size of transmitted data, as Twisted limits paramaters to 640KB max. Articles/Sites related to Twisted -------------------------------------- * **Nevow: A Web Application Construction Kit** (http://soundfarmer.com/content/nevow.html) fzZzy wrote a proposal to give a talk on nevow at this year's PyCon. It turns out to be a good overview of what nevow is about. * **Planet Twisted** (http://planet.twistedmatrix.com/) A new website which is a blog of all the Twisted developers blogs. * **Article about Twisted Networking** (http://www.onlamp.com/pub/a/python/2004/01/15/twisted_intro.html) Itamar wrote an introductory article about Twisted networking. * **Understanding Network I/O, Part 2** (http://www.onlamp.com/pub/a/python/2004/02/12/advanced_nio.html) Article by George Belotsky, on how to achieve network asynchronous I/O with examples of code in asyncore,twisted,threads, etc. Cool Things of the Week ----------------------- * **Rebirth of pyx/fzZzy blog** (http://ulaluma.com/pyx/) fzZzy has renewed his blog, with information about nevow and the successor to LivePage named liveevil. A first (very) impressive example is a chat application, located on http://soundfarmer.com/content/code/chatola/ . * **Nevow Wiki** (http://divmod.org/users/slyphon.twistd/nevow/moin.cgi/) A survey is online showing who's doing what with Nevow today. There are many really interesting projects going on! * **Beyond2** (http://www.asbahr.com/beyond.html) Beyond 2 builds upon the Twisted server and extends it to enable arbitrary 3D clients to connect to a common simulation framework. Twisted provides object persistence, remote method invocation, database integration, and more. The project seems to restart/continue, with the help of Nafai and lstep. A Wiki has been set up on http://www.beyond2.org/ * **Twisted Forum** (http://twisted.banquise.org/) Some new sections have been added to the forum (Snippets, PB), New/Updated Cool Software ----------------------------- * **UpStage** (http://sourceforge.net/projects/upstage/) A complex chat application that allows streaming of video. * **BEEP protocol** (http://freshmeat.net/redir/beepy/31931/url_homepage/beepy.sourceforge.net) The BEEPy Python BEEP Library is an implementation of the Blocks Extensible Exchange Protocol (RFC3080), written as a Python library. The difference with the previous version, is that it is now implemented with Twisted! ("It is now implemented using the Twisted framework for fast, asynchronous network communications") * **Shtoom** (http://shtoom.sourceforge.net/) Shtoom is a pure python implementation of a Voice over IP software phone. * **Trash** (http://thorne.ath.cx/~stephen/software.html) 'Trash' a pastebin application written using the Twisted framwork (using woven). * **GoSiege** (http://www.stranex.com/~perspex/gosiege/) A game on the Go game model, but in a online multiplayer (MMOG) mode. The code is really a very good example of well written code (at least from my point of view). I recommend it if you're looking for PB example code. * **Twibber** (http://slarty.polito.it:8069/~sciasbat/wiki/moin.cgi/twibber) Version 0.2.0pre1, twibber is a Python package aimed at handling the Jabber - XMMP protocol in a completely asynchronous way. * **Crow's Nest** (http://crowsnest.sourceforge.net/) Crow's Nest is a project designed to help collect log information from various sources and to apply some filter to them in a very modular way. * **PETMail** (http://petmail.lothar.com/) PETMail is a permission-based anti-spam replacement for SMTP, using recipient-defined CAPTCHA challenges for new senders, automatic (but revocable) permission-granting for most correspondents, encrypted and signed (but pseudonymous) messages, and provisions for easily changing addresses or transports (including a mechanism to publish remailer SURBs as a destination). * **PEAK 0.5a2** (http://peak.telecommunity.com/) (Not directly related to Twisted, but allows the developer to use the twisted reactor). The third alpha is available. That version includes a new framework (peak.events) that allows the developer to make his programs more event-driven (in the sense of subscribers/observers). The event loop, as usual, can be set to be Twisted's reactor. Current releases ----------------- * Twisted: 1.1.1 (released 2003-12-10) (devel version: 1.1.2alpha2) * Quotient: 0.8.8 (released 2003-12-12) * Twisted Java: 0.6.1 (released 2003-12-02) Ok, that's it for this week. Thanks for reading!

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[Twisted-Python] [PATCH] nasty bug in twisted.names.client.createResolver
by ralf＠brainbot.com 17 Feb '04

17 Feb '04

The parameter variable 'hosts' gets overwritten by the import statement in createResolver. hosts.Resolver constructor is called with a module instead of a filename. - Ralf =================================================================== RCS file: /cvs/Twisted/twisted/names/client.py,v retrieving revision 1.45 diff -u -r1.45 client.py --- twisted/names/client.py 4 Feb 2004 19:55:34 -0000 1.45 +++ twisted/names/client.py 17 Feb 2004 01:01:53 -0000 @@ -303,20 +303,20 @@ return p -def createResolver(servers = None, resolvconf = None, hosts = None): +def createResolver(servers = None, resolvconf = None, hostsfile = None): import resolve, cache, hosts, root if platform.getType() == 'posix': if resolvconf is None: resolvconf = '/etc/resolv.conf' - if hosts is None: - hosts = '/etc/hosts' + if hostsfile is None: + hostsfile = '/etc/hosts' theResolver = Resolver(resolvconf, servers) - hostResolver = hosts.Resolver(hosts) + hostResolver = hosts.Resolver(hostsfile) else: - if hosts is None: - hosts = r'c:\windows\hosts' + if hostsfile is None: + hostsfile = r'c:\windows\hosts' bootstrap = ThreadedResolver() - hostResolver = hosts.Resolver(hosts) + hostResolver = hosts.Resolver(hostsfile) theResolver = root.bootstrap(bootstrap) L = [hostResolver, cache.CacheResolver(), theResolver] -- brainbot technologies ag boppstrasse 64 . 55118 mainz . germany fon +49 6131 211639-1 . fax +49 6131 211639-2 http://brainbot.com/ mailto:ralf@brainbot.com

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[Twisted-Python] Client Prompt
by Daniel Henrique Debonzi 17 Feb '04

17 Feb '04

Hi everybody, Maybe this is a very stupid question, but I realy couldn't find a way to solve it by myself. Would be enough for my aplication if this example works. So, I want to have a client that read a string from the stdin and then send it to the server. Wich changes should I do in this code to this client work like a discrebed ################################################################# from twisted.internet import reactor, protocol class EchoClient(protocol.Protocol): def connectionMade(self): """I don't want to write it here I want to take data from stdin and send o server, but were and how to do it? Too much dificult? """ self.transport.write("hello, world!") def dataReceived(self, data): print data def connectionLost(self, reason): print "connection lost" from twisted.internet import reactor reactor.stop() class EchoFactory(protocol.ClientFactory): protocol = EchoClient def clientConnectionFailed(self, connector, reason): print "Connection failed - goodbye!" reactor.stop() def clientConnectionLost(self, connector, reason): print "Connection lost - goodbye!" reactor.stop() def main(): f = EchoFactory() reactor.connectTCP("localhost", 5555, f) reactor.run() if __name__ == '__main__': main() ################################################################# Thanks for all -- Daniel Henrique Debonzi Linux user number 166903 Gwyddion Embedded Free-Software Development www.gwyddion.com São Carlos, São Paulo Brazil

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[Twisted-Python] Backup Agent
by Frankie Chu 17 Feb '04

17 Feb '04

On 17 Feb 04, at 10:21 AM, twisted-python-request(a)twistedmatrix.com wrote: > Message: 1 > Date: Mon, 16 Feb 2004 10:03:37 -0500 > To: twisted-python(a)twistedmatrix.com > From: "David A. Leedom" <daleedom(a)hightowergroup.com> > Subject: [Twisted-Python] Backup Agent > Reply-To: twisted-python(a)twistedmatrix.com > > --=====================_580045343==.ALT > Content-Type: text/plain; charset="us-ascii"; format=flowed > > OK Guys I Need your help. > > I own a small computer consulting firm and am struggling with the basic > sales and marketing issues. However, I think I have finally stumbled > onto > a great "no brainer" idea: > > A Remote Backup Service for Small businesses. > > Yes I know there are a bunch out their, but I am thinking of the > Hundreds > of Businesses around my general geographic area who don't know how to > find > them and who don't backup their data. I would charge a monthly fee > for a > given amount of space used ( no more than 500 Meg) and provide a > software > that would backup and restore their data. > > My dilemma is that my margins would be to small to make it affordable > for > me to resale someone else's software. So....I would like to roll my > own. Python makes a lot of sense for many reasons that I don't need > to get > into here. > > My struggle is that although I have been programming since the > mid-70s, I > am new to Python and feel like a man groping around in the dark. Also > being new to Twisted it is like the room is full of chairs as well. I > did > get some sample code to work over the weekend, but I got a serious > brain > cramp trying to figure it all out. > > The basic architecture that I am thinking of is client/server. There > would > be three basic applications running to make things work. First, would > be > an Agent program that does most of the work. The Agent would run as a > service on each computer being backed up. Second would be a GUI > program > running locally to control the agents. Finally there would be a "Web > Service" that received backup sets from each agent or a designated > master > agent. The Web Service would handle authentication and other house > keeping > things. > > Finally the Question!!!! > There are many other details that I have in mind as well (using > patches to > reduce size, compression, encryption...), but right now I am working on > issues related to the communication between the GUI and Agents. > Assuming > that I have one or more number of agents running on a network I want > to do > a number of things. 1) Have the GUI request that the agents identify > themselves so I don't have to tell the GUI where they are. 2) > Transmit a > catalog list of the file system to the GUI so I can build a TreeView > and > pick which files to backup on each computer. 3) Finally I may want to > identify a "Master" agent that collects all the backups on the network > and > transmits them as one session to the Web Service. This would allow for > local "On Site" backups for fast restores due to normal computer > crashes > and failures. > > 1. What would you guys suggest I do to I get the GUI to ask all > the > agents to identify themselves? > 2. What would be the best approach using twisted to transmit a > file > system catalog across the local wire. I was playing with some remote > procedure calls over the weekend that seemed to work. I am thinking I > could create a class that would gather the local file system and send > it > over the wire as one lump. > 3. If I am going to transmit a backup file (<500meg) over the > wire to > another local computer what is the best Twisted approach to take? Due > to > WinXP security issues and the desire the run in a cross platform > environment I don't want to rely on normal file shares. > > There are a hundred other questions running though my mind right now, > but > this will due for now, > > > Thanks for any help you can give, > > David A. Leedom > > > > > The Hightower Group, Inc. > Custom Software Solutions Designed To Fit Your Business Like A Glove. > 165 West Airport Road/Lititz, PA 17543 > V:717-560-4002, 877-560-4002 x: 114 > F:717-560-2825 > www.hightowergroup.com > --=====================_580045343==.ALT > Content-Type: text/html; charset="us-ascii" > > <html> > <body> > OK Guys I Need your help. > I own a small computer consulting firm and am struggling with the basic > sales and marketing issues.  However, I think I have finally > stumbled onto a great "no brainer" idea:  > <x-tab>        </x-tab>A Remote > Backup Service for Small businesses.  > Yes I know there are a bunch out their, but I am thinking of the > Hundreds > of Businesses around my general geographic area who don't know how to > find them and who don't backup their data.  I would charge a > monthly > fee for a given amount of space used ( no more than 500 Meg) and > provide > a software that would backup and restore their data. > My dilemma is that my margins would be to small to make it affordable > for > me to resale someone else's software.  So....I would like to roll > my > own.  Python makes a lot of sense for many reasons that I don't > need > to get into here. > My struggle is that although I have been programming since the > mid-70s, I > am new to Python and feel like a man groping around in the dark.  > Also being new to Twisted it is like the room is full of chairs as > well.  I did get some sample code to work over the weekend, but I > got a serious brain cramp trying to figure it all out. > The basic architecture that I am thinking of is client/server.  > There would be three basic applications running to make things > work.  First, would be an Agent program that does most of the > work.  The Agent would run as a service on each computer being > backed up.  Second would be a GUI program running locally to > control > the agents.  Finally there would be a "Web Service" that > received backup sets from each agent or a designated master agent. The > Web Service would handle authentication and other house keeping > things. > Finally the Question!!!! > There are many other details that I have in mind as well (using > patches to reduce size, compression, encryption...), but right now I am > working on issues related to the communication between the GUI and > Agents.  Assuming that I have one or more number of agents running > on a network I want to do a number of things.  1)  Have the > GUI > request that the agents identify themselves so I don't have to tell the > GUI where they are.  2) Transmit a catalog list of the file system > to the GUI so I can build a TreeView and pick which files to backup on > each computer.  3)  Finally I may want to identify a > "Master" agent that collects all the backups on the network > and > transmits them as one session to the Web Service. This would allow for > local "On Site" backups for fast restores due to normal > computer crashes and failures.  > 1.<x-tab>      </x-tab>What would you > guys > suggest I do to I get the GUI to ask all the agents to identify > themselves? > 2.<x-tab>      </x-tab>What would be the > best approach using twisted to transmit a file system catalog across > the > local wire.  I was playing with some remote procedure calls over > the > weekend that seemed to work.  I am thinking I could create a class > that would gather the local file system and send it over the wire as > one > lump. > 3.<x-tab>      </x-tab>If I am going to > transmit a backup file (<500meg) over the wire to another local > computer what is the best Twisted approach to take?  Due to WinXP > security issues and the desire the run in a cross platform environment > I > don't want to rely on normal file shares. > There are a hundred other questions running though my mind right now, > but > this will due for now, > > Thanks for any help you can give, > David A. Leedom > > <x-sigsep></x-sigsep> > The Hightower Group, Inc. > Custom Software Solutions Designed To Fit Your Business Like A > Glove. > 165 West Airport Road/Lititz, PA 17543 > V:717-560-4002, 877-560-4002 x: 114 > F:717-560-2825 > <a href="http://www.hightowergroup.com/" > eudora="autourl">www.hightowergroup.com</a> > </body> > </html> > > --=====================_580045343==.ALT-- > > > > --__--__-- > > Message: 2 > Date: Mon, 16 Feb 2004 18:23:03 +0100 > From: Michal Pasternak <michal(a)pasternak.w.lub.pl> > To: twisted-python(a)twistedmatrix.com > Subject: Re: [Twisted-Python] Backup Agent > Reply-To: twisted-python(a)twistedmatrix.com > > David A. Leedom [Mon, Feb 16, 2004 at 10:03:37AM -0500]: >> 1. What would you guys suggest I do to I get the GUI to ask all >> the >> agents to identify themselves? > > Well, that's a good question. In some app I did, I used machine's IP > address > + some operating system info it run (sys.platform, os.uname) to build > a kind > of machine identifier. You could as well generate some UID, then save > it, > then send it together with machine's IP to identify it on server, by > hand. > > Using OS-specific procedures could help you with this. > >> 2. What would be the best approach using twisted to transmit a >> file >> system catalog across the local wire. I was playing with some remote >> procedure calls over the weekend that seemed to work. I am thinking I >> could create a class that would gather the local file system and send >> it >> over the wire as one lump. > > Remote procedures have limit of 640 KB for their parameters (because > "640 KB > should be enough to anyone"). You should use Pager and Collector. > >> 3. If I am going to transmit a backup file (<500meg) over the >> wire to >> another local computer what is the best Twisted approach to take? > > See above. Also, please remember, that memory issues matter. If you're > paging the data (send small chunks), you should save them on the backup > server, as they are received. If you are transfering a big file, > keeping all > the data received in some buffer is a bad idea. > > > --__--__-- > > Message: 3 > Date: Mon, 16 Feb 2004 13:00:47 -0800 > To: Twisted <twisted-python(a)twistedmatrix.com> > From: stephan <mailinglists(a)shechen.at> > Subject: [Twisted-Python] p2p, gnutella > Reply-To: twisted-python(a)twistedmatrix.com > > > > I am looking forward to add p2p functionality to my app. Does anybody > know > what the current status of twisted's gnutella implementation is? > > There seems to have been a semi-finished implemention in 1.0.2alpha4 > which > I can't find in 1.1.1 anymore. > > I might also be willing to implement missing parts but I would need to > get > a short briefing on how things are. > > thanks, > > _stephan > > > --__--__-- > > Message: 4 > Date: Mon, 16 Feb 2004 18:13:13 -0500 > To: peak(a)eby-sarna.com > From: "Phillip J. Eby" <pje(a)telecommunity.com> > Cc: zope3-dev(a)zope.org, twisted-python(a)twistedmatrix.com > Subject: [Twisted-Python] PEAK 0.5a3 released > Reply-To: twisted-python(a)twistedmatrix.com > > After several months of feature creep, the third alpha release of PEAK > 0.5 > is now available for download at: > > http://peak.telecommunity.com/dist/ > > Some highlights of the changes since 0.5a2 include: > > * A simplified and consolidated binding API: there are now only four > kinds > of bindings (Make, Obtain, Require, and Delegate) that provide a wider > variety of functionality than the old API. You can also now create > your > own IRecipe or IComponentKey implementations for use with Make and > Obtain. > > * The 'n2' (namespace navigator) tool provides a handy, extensible > shell > (with completion and history) for exploring PEAK naming systems and SQL > connections. > > * A greatly enhanced configuration file parser, with lots of new > convenience features such as [Import on Demand], [Named Services], and > [Component Factories] sections, based on its new extensible parsing > framework. You can define new section types of your own, even from > inside > an .ini file. > > * New configuration key features, such as multi-keys (similar to some > of > Zope X3's "adaptergeddon" features), the ability to iterate over > defined > keys in a hierarchy (useful for finding/registering various kinds of > "plugins"), new convenience features for defining wildcard property > rules, > > * A new 'peak.events' framework that supports event sources, listeners, > subscriptions, generator-based pseudothreads ("tasks"), scheduling, > and I/O > events. Using 'peak.events', you can write event-driven code in a more > natural, sequential, "untwisted" style, but without giving up access to > Twisted's many great features. 'peak.events' can use PEAK's built-in > event > loop, or adapt a Twisted reactor for use as an event loop. You can > also > use Twisted's "Deferred" objects as event sources, which means you can > use > them in your Tasks (pseudothreads). > > * A new 'peak.ddt' "document-driven testing" framework, similar in > form and > function to the FIT ( http://fit.c2.com/ ) framework, but in Python and > well-integrated with the rest of PEAK. 'peak.ddt' lets you write test > data > as tables in HTML documents (created with Word, Open Office, Mozilla, > or > virtually any other tool), and then view the results in your > browser. Correct results are highlighted in green, incorrect answers > are > highlighted in red, and errors are highlighted in yellow, with a > small-font > traceback added to the table cell. It's a great way to do data-driven > acceptance testing, or to manage a project's progress using example > data as > part of a requirements document. > > * Many, many more features, both large and small, like a pre-forking > multiprocess supervisor for FastCGI and other forking servers. Quick > access to documentation via the 'peak help' command, which uses pydoc > to > display reference documentation. Early versions of the 'peak.security' > (access control), 'peak.web' (Zope X3-based web publishing), and > 'peak.query' (declarative relational and conceptual queries w/SQL > generation) packages. The 'whenImported()' function that lets you > call a > hook when a named module is first used. "Mock" DBAPI and socket > implementations for testing. Hooks for "thunking" database-specific > SQL > and functions. And many, many more examples of unbelievably blatant > feature creep! > > There is also now a nice "Hello World" introduction to PEAK available > at: > > http://peak.telecommunity.com/DevCenter/IntroToPeak > > that presents a guided tour of some of PEAK's "vertical" frameworks, > like > command-line application support, database access, and so on. > > For more information about PEAK, and access to community resources > including documentation, the Wiki, mailing list archives, IRC channel > logs, > CVS access, and more, please visit: > > http://peak.telecommunity.com/ > > > > --__--__-- > > Message: 5 > To: twisted-python(a)twistedmatrix.com > From: ralf(a)brainbot.com > Date: Tue, 17 Feb 2004 02:05:41 +0100 > Subject: [Twisted-Python] [PATCH] nasty bug in > twisted.names.client.createResolver > Reply-To: twisted-python(a)twistedmatrix.com > > The parameter variable 'hosts' gets overwritten by the import statement > in createResolver. hosts.Resolver constructor is called with a module > instead of a filename. > > - Ralf > > =================================================================== > RCS file: /cvs/Twisted/twisted/names/client.py,v > retrieving revision 1.45 > diff -u -r1.45 client.py > --- twisted/names/client.py 4 Feb 2004 19:55:34 -0000 1.45 > +++ twisted/names/client.py 17 Feb 2004 01:01:53 -0000 > @@ -303,20 +303,20 @@ > return p > > > -def createResolver(servers = None, resolvconf = None, hosts = None): > +def createResolver(servers = None, resolvconf = None, hostsfile = > None): > import resolve, cache, hosts, root > if platform.getType() == 'posix': > if resolvconf is None: > resolvconf = '/etc/resolv.conf' > - if hosts is None: > - hosts = '/etc/hosts' > + if hostsfile is None: > + hostsfile = '/etc/hosts' > theResolver = Resolver(resolvconf, servers) > - hostResolver = hosts.Resolver(hosts) > + hostResolver = hosts.Resolver(hostsfile) > else: > - if hosts is None: > - hosts = r'c:\windows\hosts' > + if hostsfile is None: > + hostsfile = r'c:\windows\hosts' > bootstrap = ThreadedResolver() > - hostResolver = hosts.Resolver(hosts) > + hostResolver = hosts.Resolver(hostsfile) > theResolver = root.bootstrap(bootstrap) > > L = [hostResolver, cache.CacheResolver(), theResolver] > > -- > brainbot technologies ag > boppstrasse 64 . 55118 mainz . germany > fon +49 6131 211639-1 . fax +49 6131 211639-2 > http://brainbot.com/ mailto:ralf@brainbot.com > > > --__--__-- > > Message: 6 > Subject: Re: [Twisted-Python] [PATCH] nasty bug in > twisted.names.client.createResolver > From: Itamar Shtull-Trauring <itamar(a)itamarst.org> > To: twisted-python(a)twistedmatrix.com > Organization: http://itamarst.org > Date: Mon, 16 Feb 2004 20:33:55 -0500 > Reply-To: twisted-python(a)twistedmatrix.com > > On Mon, 2004-02-16 at 20:05, ralf(a)brainbot.com wrote: >> The parameter variable 'hosts' gets overwritten by the import >> statement >> in createResolver. hosts.Resolver constructor is called with a module >> instead of a filename. > > Please add patches and bugs to twistedmatrix.com/bugs/ > > > > --__--__-- > > Message: 7 > Subject: Re: [Twisted-Python] Advice on doing thousands of > simultaneous UDP > queries with Twisted... > From: Itamar Shtull-Trauring <itamar(a)itamarst.org> > To: twisted-python(a)twistedmatrix.com > Organization: http://itamarst.org > Date: Mon, 16 Feb 2004 20:40:06 -0500 > Reply-To: twisted-python(a)twistedmatrix.com > > On Mon, 2004-02-09 at 05:51, Mike C. Fletcher wrote: > >> Writing a simple asynchronous loop myself (poll on a simple socket, >> send >> message from queue when writable, read one into other queue when >> readable) allowed for doing a few thousand queries simultaneously), >> with >> only a few dozen dropped messages. However, with the Twisted >> equivalent >> (UDPTransport with my simple protocol object), I was seeing huge drop >> rates, so, gathering that Twisted isn't queueing up the UDP requests, > > Possibly we need some generic UDP queuing, rather than current system. > Patches are welcome. > > -- > Itamar Shtull-Trauring http://itamarst.org > Looking for a job: http://itamarst.org/resume.html > > > > --__--__-- > > Message: 8 > To: twisted-python(a)twistedmatrix.com > From: ralf(a)brainbot.com > Date: Tue, 17 Feb 2004 02:47:19 +0100 > Subject: [Twisted-Python] [PATCH] twisted.names.hosts not working > correct with getHostByName > Reply-To: twisted-python(a)twistedmatrix.com > > Even with my prior patch I'm not able to use > twisted.names.client.getHostByName. > Seems like twisted.names.hosts.Resolver calls itself with bad > parameters > and even doesn't use the ip address it extracted from /etc/hosts. Also > the return > value could not be handled by the code in > twisted.names.common.extractRecord. > The following patch seems to solve those problems. > > - Ralf > > > > > =================================================================== > RCS file: /cvs/Twisted/twisted/names/hosts.py,v > retrieving revision 1.14 > diff -u -r1.14 hosts.py > --- twisted/names/hosts.py 19 Jul 2003 10:13:50 -0000 1.14 > +++ twisted/names/hosts.py 17 Feb 2004 01:45:44 -0000 > @@ -49,11 +49,11 @@ > > > def query(self, query, timeout = None): > - return self._lookup(str(query.name), query.type, query.type, > timeout) > + return self._lookup(str(query.name), query.cls, query.type, > timeout) > > > def _lookup(self, name, cls, type, timeout): > - if cls != dns.IN or type != dns.A: > + if cls != dns.IN or (type != dns.A and type != > dns.ALL_RECORDS): # getHostByName passes type==dns.ALL_RECORDS. what > else do we need here? > return > defer.fail(failure.Failure(NotImplementedError(type, cls))) > return self.lookupAddress( > name, timeout > @@ -64,7 +64,7 @@ > res = searchFileFor(self.file, name) > if res: > return defer.succeed([ > - [dns.RRHeader(name, dns.A, dns.IN, self.ttl)], (), () > + [dns.RRHeader(name, dns.A, dns.IN, self.ttl, > dns.Record_A(res, self.ttl))], [], [] > ]) > return defer.fail(failure.Failure(dns.DomainError(name))) > > -- > brainbot technologies ag > boppstrasse 64 . 55118 mainz . germany > fon +49 6131 211639-1 . fax +49 6131 211639-2 > http://brainbot.com/ mailto:ralf@brainbot.com > > > --__--__-- > > Message: 9 > Date: Mon, 16 Feb 2004 22:47:47 -0300 > From: Daniel Henrique Debonzi <debonzi(a)gwyddion.com> > To: twisted-python(a)twistedmatrix.com > Subject: [Twisted-Python] Client Prompt > Reply-To: twisted-python(a)twistedmatrix.com > > Hi everybody, > > Maybe this is a very stupid question, but I realy couldn't find a way > to > solve it by myself. > > Would be enough for my aplication if this example works. > > So, I want to have a client that read a string from the stdin and then > send it to the server. Wich changes should I do in this code to this > client work like a discrebed > > ################################################################# > from twisted.internet import reactor, protocol > > class EchoClient(protocol.Protocol): > > def connectionMade(self): > """I don't want to write it here > I want to take data from stdin and send o server, > but were and how to do it? Too much dificult? > """ > self.transport.write("hello, world!") > > def dataReceived(self, data): > print data > > def connectionLost(self, reason): > print "connection lost" > from twisted.internet import reactor > reactor.stop() > > > class EchoFactory(protocol.ClientFactory): > protocol = EchoClient > > def clientConnectionFailed(self, connector, reason): > print "Connection failed - goodbye!" > reactor.stop() > > def clientConnectionLost(self, connector, reason): > print "Connection lost - goodbye!" > reactor.stop() > > > def main(): > f = EchoFactory() > reactor.connectTCP("localhost", 5555, f) > reactor.run() > > if __name__ == '__main__': > main() > > ################################################################# > > Thanks for all > > > > -- > Daniel Henrique Debonzi Linux user number 166903 > Gwyddion Embedded Free-Software Development > www.gwyddion.com > São Carlos, São Paulo > Brazil > > > > --__--__-- > > Message: 10 > To: twisted-python(a)twistedmatrix.com > Subject: Re: [Twisted-Python] [PATCH] nasty bug in > twisted.names.client.createResolver > From: ralf(a)brainbot.com > Date: Tue, 17 Feb 2004 03:20:28 +0100 > Reply-To: twisted-python(a)twistedmatrix.com > > Itamar Shtull-Trauring <itamar(a)itamarst.org> writes: > >> On Mon, 2004-02-16 at 20:05, ralf(a)brainbot.com wrote: >>> The parameter variable 'hosts' gets overwritten by the import >>> statement >>> in createResolver. hosts.Resolver constructor is called with a module >>> instead of a filename. >> >> Please add patches and bugs to twistedmatrix.com/bugs/ >> > > Lots of bug reports in the bug tracker have status 'unread'. That's > not very motivating. Just committing this patch -even if it was wrong- > would not make things worse, as the original code is definitely > broken. But, I'll add it to the bugtracker tomorrow. > > - Ralf > > -- > brainbot technologies ag > boppstrasse 64 . 55118 mainz . germany > fon +49 6131 211639-1 . fax +49 6131 211639-2 > http://brainbot.com/ mailto:ralf@brainbot.com > > > > --__--__-- > > _______________________________________________ > Twisted-Python mailing list > Twisted-Python(a)twistedmatrix.com > http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python > > > End of Twisted-Python Digest

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[Twisted-Python] [PATCH] twisted.names.hosts not working correct with getHostByName
by ralf＠brainbot.com 16 Feb '04

16 Feb '04

Even with my prior patch I'm not able to use twisted.names.client.getHostByName. Seems like twisted.names.hosts.Resolver calls itself with bad parameters and even doesn't use the ip address it extracted from /etc/hosts. Also the return value could not be handled by the code in twisted.names.common.extractRecord. The following patch seems to solve those problems. - Ralf =================================================================== RCS file: /cvs/Twisted/twisted/names/hosts.py,v retrieving revision 1.14 diff -u -r1.14 hosts.py --- twisted/names/hosts.py 19 Jul 2003 10:13:50 -0000 1.14 +++ twisted/names/hosts.py 17 Feb 2004 01:45:44 -0000 @@ -49,11 +49,11 @@ def query(self, query, timeout = None): - return self._lookup(str(query.name), query.type, query.type, timeout) + return self._lookup(str(query.name), query.cls, query.type, timeout) def _lookup(self, name, cls, type, timeout): - if cls != dns.IN or type != dns.A: + if cls != dns.IN or (type != dns.A and type != dns.ALL_RECORDS): # getHostByName passes type==dns.ALL_RECORDS. what else do we need here? return defer.fail(failure.Failure(NotImplementedError(type, cls))) return self.lookupAddress( name, timeout @@ -64,7 +64,7 @@ res = searchFileFor(self.file, name) if res: return defer.succeed([ - [dns.RRHeader(name, dns.A, dns.IN, self.ttl)], (), () + [dns.RRHeader(name, dns.A, dns.IN, self.ttl, dns.Record_A(res, self.ttl))], [], [] ]) return defer.fail(failure.Failure(dns.DomainError(name))) -- brainbot technologies ag boppstrasse 64 . 55118 mainz . germany fon +49 6131 211639-1 . fax +49 6131 211639-2 http://brainbot.com/ mailto:ralf@brainbot.com

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[Twisted-Python] PEAK 0.5a3 released
by Phillip J. Eby 16 Feb '04

16 Feb '04

After several months of feature creep, the third alpha release of PEAK 0.5 is now available for download at: http://peak.telecommunity.com/dist/ Some highlights of the changes since 0.5a2 include: * A simplified and consolidated binding API: there are now only four kinds of bindings (Make, Obtain, Require, and Delegate) that provide a wider variety of functionality than the old API. You can also now create your own IRecipe or IComponentKey implementations for use with Make and Obtain. * The 'n2' (namespace navigator) tool provides a handy, extensible shell (with completion and history) for exploring PEAK naming systems and SQL connections. * A greatly enhanced configuration file parser, with lots of new convenience features such as [Import on Demand], [Named Services], and [Component Factories] sections, based on its new extensible parsing framework. You can define new section types of your own, even from inside an .ini file. * New configuration key features, such as multi-keys (similar to some of Zope X3's "adaptergeddon" features), the ability to iterate over defined keys in a hierarchy (useful for finding/registering various kinds of "plugins"), new convenience features for defining wildcard property rules, * A new 'peak.events' framework that supports event sources, listeners, subscriptions, generator-based pseudothreads ("tasks"), scheduling, and I/O events. Using 'peak.events', you can write event-driven code in a more natural, sequential, "untwisted" style, but without giving up access to Twisted's many great features. 'peak.events' can use PEAK's built-in event loop, or adapt a Twisted reactor for use as an event loop. You can also use Twisted's "Deferred" objects as event sources, which means you can use them in your Tasks (pseudothreads). * A new 'peak.ddt' "document-driven testing" framework, similar in form and function to the FIT ( http://fit.c2.com/ ) framework, but in Python and well-integrated with the rest of PEAK. 'peak.ddt' lets you write test data as tables in HTML documents (created with Word, Open Office, Mozilla, or virtually any other tool), and then view the results in your browser. Correct results are highlighted in green, incorrect answers are highlighted in red, and errors are highlighted in yellow, with a small-font traceback added to the table cell. It's a great way to do data-driven acceptance testing, or to manage a project's progress using example data as part of a requirements document. * Many, many more features, both large and small, like a pre-forking multiprocess supervisor for FastCGI and other forking servers. Quick access to documentation via the 'peak help' command, which uses pydoc to display reference documentation. Early versions of the 'peak.security' (access control), 'peak.web' (Zope X3-based web publishing), and 'peak.query' (declarative relational and conceptual queries w/SQL generation) packages. The 'whenImported()' function that lets you call a hook when a named module is first used. "Mock" DBAPI and socket implementations for testing. Hooks for "thunking" database-specific SQL and functions. And many, many more examples of unbelievably blatant feature creep! There is also now a nice "Hello World" introduction to PEAK available at: http://peak.telecommunity.com/DevCenter/IntroToPeak that presents a guided tour of some of PEAK's "vertical" frameworks, like command-line application support, database access, and so on. For more information about PEAK, and access to community resources including documentation, the Wiki, mailing list archives, IRC channel logs, CVS access, and more, please visit: http://peak.telecommunity.com/

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