Mailman 3 July 2009 - Twisted-web

Error chanel in Nevow.Athena
by Glyph Lefkowitz 20 Jul '09

20 Jul '09

On Sun, Jul 19, 2009 at 6:55 PM, Juanjo Conti<jjconti(a)gmail.com> wrote: > I have notice that when an error occur in a LiveElement (lost > connection or not handled exception in the server) an error message is > displayed in the browser. Is there an explicit way to use this error > showing mechanism to display errors from my application? This stuff > seems not covered in Athena documentation. The error dialog you're noticing comes from Nevow.Athena.PageWidget.showErrorDialog (which is defined in Nevow/nevow/js/Nevow/Athena/__init__.js). The PageWidget is the root JavaScript class that controls everything that's going on on the page. If you want to customize this, you should subclass Nevow.Athena.PageWidget in your application, and override showErrordDialog. On the Python side of things, you need to subclass nevow.athena.LivePage, and set your subclass's jsClass attribute to the name of your PageWidget subclass. I would not recommend trying to implement everything PageWidget does itself, since it does quite a lot and its interface isn't completely documented anywhere. This could definitely be better documented. Can you contribute a documentation patch that explains that stuff I just said? :-)

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Error chanel in Nevow.Athena
by Juanjo Conti 20 Jul '09

20 Jul '09

I have notice that when an error occur in a LiveElement (lost connection or not handled exception in the server) an error message is displayed in the browser. Is there an explicit way to use this error showing mechanism to display errors from my application? This stuff seems not covered in Athena documentation. Greets, -- Juanjo Conti

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A question with storm orm and Nevow
by Daniel Yang 17 Jul '09

17 Jul '09

Hi people, I am using storm orm(twisted-integration) with Nevow. There is a question that confuses me a lot: (since storm orm(twisted-integration) does db io in a asynchronous way). In a render function, before my data returns, what should I return for the render function? does Nevow has something like server.NOT_DONE_YET? or there is a "deferred" way to do this? FYI: http://www.divmod.org/trac/wiki/DivmodNevow/Storm This article does not help. Thanks! -- ----------------------------------------------- Yours Faithfully Daniel Yang

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Radio button checked error at nevow._flat.FlattenerError
by Juanjo Conti 17 Jul '09

17 Jul '09

I founded out that if I have <input type="radio" name="consignas" value="1" checked /> in my HTML I get this error: <class 'nevow._flat.FlattenerError'>: /home/juanjo/python/twisted/teco/ter.html:21:63: not well-formed (invalid token) <input type="radio" name="consignas" value="1" checked="checked" /> fix it an works fine. Greets, -- Juanjo Conti

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Cannot render a LivePage more than once
by Juanjo Conti 10 Jul '09

10 Jul '09

HI! I'm using LivePage from Nevow.Athena like this: class TerPage(LivePage): docFactory = loaders.stan(T.html[ T.head(render=T.directive('liveglue')), T.body(render=T.directive('myElement'))]) def beforeRender(self, ctx): d = self.notifyOnDisconnect() d.addErrback(self.disconn) def disconn(self, reason): del lectores[hash(self.element)] def render_myElement(self, ctx, data): self.element = TempElement() self.element.setFragmentParent(self) return ctx.tag[self.element] def child_(self, ctx): return TerPage() site = appserver.NevowSite(TerPage()) reactor.listenTCP(8009, site) When I load the page for first time, it's rendered ok. But if I hit the reload button or someone access it from other computer, this exception is shown: Cannot render a LivePage more than once. Could you point me the correct way of doing it? Thanks, -- Juanjo Conti

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Strange Nevow / Athena error
by Paul Reznicek 08 Jul '09

08 Jul '09

Hello, I observe this error few times a day and have no idea about what is causing it, neither under which conditions it happen (Nevow-0.9.33): Traceback (most recent call last): File "/usr/lib/python2.6/dist-packages/twisted/internet/defer.py", line 195, in addCallback callbackKeywords=kw) File "/usr/lib/python2.6/dist-packages/twisted/internet/defer.py", line 186, in addCallbacks self._runCallbacks() File "/usr/lib/python2.6/dist-packages/twisted/internet/defer.py", line 328, in _runCallbacks self.result = callback(self.result, *args, **kw) File "/usr/local/lib/python2.6/dist-packages/nevow/appserver.py", line 163, in gotPageContext pageContext.tag.renderHTTP, pageContext --- <exception caught here> --- File "/usr/lib/python2.6/dist-packages/twisted/internet/defer.py", line 106, in maybeDeferred result = f(*args, **kw) File "/usr/local/lib/python2.6/dist-packages/nevow/athena.py", line 440, in renderHTTP messageData = json.parse(requestContent) File "/usr/local/lib/python2.6/dist-packages/nevow/json.py", line 228, in parse value, tokens = parseValue(tokens) File "/usr/local/lib/python2.6/dist-packages/nevow/json.py", line 130, in parseValue if tokens[0] == '{': exceptions.IndexError: list index out of range I asked some user, but nobody observed problems on the user site, any idea, what is wrong? Regards, Paul

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WebDAV
by Simone Deponti 08 Jul '09

08 Jul '09

Hello all, I was searching for a way to implement a fast, reliable WebDAV server. I've been using Apache so far, but without exciting results, as there are a couple of things (among those, Windows client support) that just don't cut it. So, having some twisted programming experience, I thought about giving a twisted solution a try because I remember seeing the dav module inside web2: but looking at trunk, I couldn't find it anymore. I thought it had then been backported into web, but no luck there aswell. Anybody knows about it? And what is the current state? Is it usable, or needs some "loving"? Greetings Simone Deponti

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Athena can handler list
by Juanjo Conti 08 Jul '09

08 Jul '09

Where can I found a list of events Athena can handle? <athena:handler event="onsubmit" handler="doRead" /> I know onsubmit and onkeypress. I tried to use onload but didnt work :( -- Juanjo Conti

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id property modified by Athena
by Juanjo Conti 08 Jul '09

08 Jul '09

I have this Nevow.Athena code: <div xmlns:nevow="http://nevow.com/ns/nevow/0.1" xmlns:athena="http://divmod.org/ns/athena/0.7" nevow:render="liveElement"> <h2>Grafica</h2> <div id="placeholder" style="width:600px;height:300px">****</div> </div> When the live element is rendered, the id is changed to something like athena:1-placeholder. This gived me some headaches using JQuery $(#id) form. Does anyone know something about this? Greets! PS: I use the name attribute now. -- Juanjo Conti

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Re: [Twisted-web] [Twisted-Python] http.Request and JSON
by Jean-Paul Calderone 08 Jul '09

08 Jul '09

On Tue, 30 Jun 2009 13:12:05 +0100, Reza Lotun <rlotun(a)gmail.com> wrote: >Hi, > >On Tue, Jun 30, 2009 at 12:56 PM, Tristan >Seligmann<mithrandi(a)mithrandi.net> wrote: >>> To be safer, I do a request.content.getvalue() since content is a >>> cStringIO object and you can never be sure if somewhere along the >>> chain of processing someone hasn't done a .read and forgot to do a >>> .seek(0,0). >> >> You should probably do the seek/read instead, since I don't believe >> this is guaranteed to be a cStringIO; it might be an actual file on >> disk, or something else. > >If that's true then there really should be a .get_body() method on the >request object. Why can't you seek and read? Also, this discussion would be more appropriate on the twisted-web mailing list. Jean-Paul

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