Mailman 3 December 2006 - Twisted-web

web2 and database handling
by Mircea Amarascu 13 Dec '06

13 Dec '06

Hello, I want to attach the result of a database SELECT query to the response of a HTTP GET request. In twisted.web I've done it this way: ------------------------------ from twisted.web import resource, server, http from twisted.enterprise import adbapi class Site(resource.Resource): ... def render(self, request): query = "SELECT data FROM test" self.db.runQuery(query).addCallback( self._gotData, request).addErrback( self._dbError, request) return server.NOT_DONE_YET def _gotData(self, results, request): request.write("%s" % data[0]) request.write(body) request.finish() def _dbError(self, failure, request): request.setResponseCode(http.INTERNAL_SERVER_ERROR) request.write("Error fetching data.") request.finish() ------------------------------ What is the best way to perform the same operation in web2? A web2.server.NOT_DONE_YET constant is not defined. In other words, how could I return a defer-related response instead of a simple http.Response object ? Thank you.

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Listening to SOAP messages in a web service
by PAPPU Sai Venkatakrishnan 10 Dec '06

10 Dec '06

Hi, I am working on twisted framework to create a test harness for testing and monitoring web services. The idea is to non intrusively monitor SOAP requests sent to or from a webservice and log them. I approached the problem by creating a miniature proxy server to log the HTTP requests through the machine at the port in which the webservice is listening. But since the webservice is already using the port the proxy is not able to run. Is there a way in which I can listen to the SOAP messages traffic in a webservice using twisted? Please let me know your ideas. Thank you. Regards, Sai

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twisted log files
by Noah Gift 10 Dec '06

10 Dec '06

I am not sure if awstats directly parses twisted log files, but I recently wrote a chunk of python code to re-parse sections of the awstats output and control when it was run etc. It got me thinking that it would be great to have a python version of awstats, perhaps integrated into a web application framework. That is the problem with using awstats with python as awstats is all perl and the config file is just huge around 1500 lines I think. Noah Gift On 12/9/06, twisted-web-request(a)twistedmatrix.com < twisted-web-request(a)twistedmatrix.com> wrote: > > Send Twisted-web mailing list submissions to > twisted-web(a)twistedmatrix.com > > To subscribe or unsubscribe via the World Wide Web, visit > http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-web > or, via email, send a message with subject or body 'help' to > twisted-web-request(a)twistedmatrix.com > > You can reach the person managing the list at > twisted-web-owner(a)twistedmatrix.com > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Twisted-web digest..." > > > Today's Topics: > > 1. twisted log files and awstats (Manlio Perillo) > > > > ---------- Forwarded message ---------- > From: Manlio Perillo <manlio_perillo(a)libero.it> > To: twisted-web(a)twistedmatrix.com > Date: Sat, 09 Dec 2006 15:34:12 +0100 > Subject: [Twisted-web] twisted log files and awstats > Is it possibile to analize twisted.web log files with awstats and how? > > > > Thanks and regards Manlio Perillo > > > > > > _______________________________________________ > Twisted-web mailing list > Twisted-web(a)twistedmatrix.com > http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-web > > >

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twisted log files and awstats
by Manlio Perillo 09 Dec '06

09 Dec '06

Is it possibile to analize twisted.web log files with awstats and how? Thanks and regards Manlio Perillo

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Error importing reactor from twisted.internet
by PAPPU Sai Venkatakrishnan 07 Dec '06

07 Dec '06

Hi, I am newly learning twisted use it in my development projects. I installed twisted in my machine imported the reactor from twisted.internet. But I got an error stating internet.protocol is not present. Traceback (most recent call last): File "<pyshell#2>", line 1, in -toplevel- from twisted.internet import reactor File "C:\Python24\Scripts\twisted.py", line 1, in -toplevel- from twisted.internet.protocol import protocol ImportError: No module named internet.protocol I am not sure as the necessary paths are in the PYTHONPATH as well. Please help me to resolve this issue. Thank you for your support. Regards, Sai

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Re: [Twisted-web] Athena closed the live connection when escape is hit
by glyph＠divmod.com 05 Dec '06

05 Dec '06

On 12:31 am, p.mayers(a)imperial.ac.uk wrote: >Jean-Paul Calderone wrote: >>On Mon, 04 Dec 2006 00:08:05 +0000, Phil Mayers <p.mayers(a)imperial.ac.uk> >>wrote: >>>Why? >>> >>>http://divmod.org/trac/browser/trunk/Nevow/nevow/js/Nevow/Athena/__init__.j… >> >>Lack of time to implement something different. > >Ok, I guess what I'm asking is - why is it ever necessary for the client to >execute a close of the live connection via the keyboard (other than >debugging of course) and will anything break if I comment that out? > >I'm guessing not. If escape isn't handled, then sometimes it will invoke the "stop" button, which causes random non-deterministic connection failures which aren't immediately reported. I don't entirely understand the situation, but an immediate failure is better than what was happening before. I believe this is actually fixable, but as JP says, we don't have time at the moment.

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Athena closed the live connection when escape is hit
by Phil Mayers 03 Dec '06

03 Dec '06

Why? http://divmod.org/trac/browser/trunk/Nevow/nevow/js/Nevow/Athena/__init__.j…

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Is Nevow Development Still Active?
by Saad Shakhshir 03 Dec '06

03 Dec '06

Hi, I just took a look at the nevow-commits mailing list and noticed that there hasn't been any activity since April this year. Is Nevow development still active and if it is, where is the best place to keep up to date on what's happening with it? thanks, Saad

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How to nest LiveElements? (getting a MissingRenderMethod error)
by kgi 01 Dec '06

01 Dec '06

Hi there. I've got a web app that was originally written as a bunch of LiveElements at the top level of a LivePage. I want to clean up this code and restructure it such that several of the LiveElements are more modular; this entails making some of the LiveElements contain other LiveElements. Now, I could have *sworn* I've done this before, but whatever I try to do now I get a nevow.errors.MissingRenderMethod exception. At the end of this email is a cut-down example that exhibits the behaviour. OuterWidget and InnerWidget are two LiveElement objects; they can both exist happily in the LivePage, but if you uncomment the div containing an innerWidget rendering directive (around line 28) you get: File "/usr/lib/python2.4/site-packages/nevow/flat/ten.py", line 70, in serialize return partialflatten(context, obj) File "/usr/lib/python2.4/site-packages/nevow/flat/ten.py", line 61, in partialflatten return flattener(obj, context) File "/usr/lib/python2.4/site-packages/nevow/flat/flatstan.py", line 261, in DirectiveSerializer renderer = rendererFactory.renderer(context, original.name) File "/usr/lib/python2.4/site-packages/nevow/page.py", line 78, in renderer raise MissingRenderMethod(self, name) nevow.errors.MissingRenderMethod: (<OuterWidget object at 0xb763482c>, 'innerWidget') Can anyone shed any light on this? There are also seemingly three styles for render methods that I've found. The third was kind of guessed from the documentation of nevow.page.Element; I'm not sure I've used it correctly, but I seem to recall reading that the special "render_" prefixes will be going away and replaced by a renderer() registration method, like the expose() method for athena callables. Which is the preferred form? def render_innerWidget ( self, ctx, data ): elem = InnerWidget() elem.setFragmentParent ( self ) return elem def render_innerWidget ( self, ctx, data ): elem = InnerWidget() elem.setFragmentParent ( self ) return ctx.tag[f] from nevow.page import renderer def innerWidget ( self, request, tag ): elem = InnerWidget() elem.setFragmentParent ( self ) return elem renderer(items) Thanks, Ricky -- # Run using 'twistd -noy file.py'; point browser to localhost:8080 from nevow import athena from nevow import stan from nevow import loaders from nevow import tags as T from nevow import flat from nevow import static class InnerWidget ( athena.LiveElement ): docFactory = loaders.stan ( T.div ( render = T.directive ( 'liveElement' ), ) [ T.p ( _class = 'bar' ) [ "This is InnerWidget text" ] ] ) class OuterWidget ( athena.LiveElement ): docFactory = loaders.stan ( T.div ( render = T.directive ( 'liveElement' ), ) [ T.p ( _class = "foo" ) [ "This is OuterWidget text" ], # I can't create an InnerWidget inside the OuterWidget. # T.div ( render = T.directive ( "innerWidget" ) ), ] ) def render_innerWidget ( self, ctx, data ): elem = InnerWidget() elem.setFragmentParent ( self ) return ctx.tag[f] class WebApp ( athena.LivePage ): DOCTYPE_XHTML = ( '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" ' '"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">' ) _css = T.link ( rel = "stylesheet", type = "text/css", href = "css/style.css" ) docFactory = loaders.stan ( [ T.xml ( DOCTYPE_XHTML ), T.html [ T.head ( render = T.directive ( 'liveglue' ) ) [ _css ], T.body [ T.div ( render = T.directive ( 'outerWidget') ), # But I can create an InnerWidget at the top-level, inside # athena.LivePage. T.div ( render = T.directive ( 'innerWidget') ), ] ] ] ) addSlash = True def render_outerWidget ( self, ctx, data ): f = OuterWidget() f.setFragmentParent(self) return ctx.tag[f] def render_innerWidget ( self, ctx, data ): f = InnerWidget() f.setFragmentParent(self) return ctx.tag[f] def child_css ( self, ctx ): return static.File ( 'css' ) def child_js ( self, ctx ): return static.File ( 'js' ) from twisted.application import service, internet from nevow import appserver res = WebApp() site = appserver.NevowSite ( res ) application = service.Application ( "WebApp" ) webService = internet.TCPServer ( 8080, site ) webService.setServiceParent ( application ) --

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T.directive -> function/method names in stan
by Phil Mayers 01 Dec '06

01 Dec '06

The formal code contains (in the examples.main module) this construct: T.body[ T.h1(data=T.directive('title'), render=rend.data), T.p(data=T.directive('description'), render=rend.data), T.directive('form example'), ], Can someone point me at the bit of nevow code that results in that calling: class anexample: def form_example(self, ctx): # stuff The stan flattener container a DirectiveSerializer that just looks for an IRendererFactory on the context and calls factory.renderer(ctx, name) but as far as I can tell it ought to end up calling: page.render_form('example')

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