Mailman 3 December 2003 - Twisted-web

using nevow with python2.2
by James Y Knight Dec. 18, 2003

Dec. 18, 2003

So, I'm able to get nevow to work on python2.2 with some minor changes. The things that are used in python 2.3 that don't exist in python2.2 that I had to change: 1) generators available without explicit import 2) itertools 3) basestring 4) extended slice-n-dice "[::-1]" on builtin sequences The only change here that isn't really usable directly is commenting out lines in components.wsv. I don't know what needs to be done to make that compatible with 2.2 without losing functionality with 2.3. Maybe ignore missing classes while loading? If it was code instead of a .wsv file you could simply put an if around the new classes... It would be nice if nevow was explicitly supported on python2.2 since the differences are very minimal, and there is no python2.3 for debian stable. Note: you need to set your PYTHONPATH to something that includes only the "atop" and "nevow" directories from quotient, or else python will magically try (and fail) to load other parts of quotient. James Index: atop/wsvload.py =================================================================== RCS file: /cvs/Quotient/atop/wsvload.py,v retrieving revision 1.6 diff -u -r1.6 wsvload.py --- atop/wsvload.py 21 Nov 2003 20:27:58 -0000 1.6 +++ atop/wsvload.py 17 Dec 2003 21:19:22 -0000 @@ -4,6 +4,8 @@ # Public License as published by the Free Software Foundation. # objects that should be in tpython +from __future__ import generators + def getAOI(fObj): for line in fObj: line = line.strip() Index: nevow/components.wsv =================================================================== RCS file: /cvs/Quotient/nevow/components.wsv,v retrieving revision 1.20 diff -u -r1.20 components.wsv --- nevow/components.wsv 17 Dec 2003 01:45:05 -0000 1.20 +++ nevow/components.wsv 17 Dec 2003 21:19:22 -0000 @@ -26,7 +26,7 @@ nevow.serial.flatstan.StringCastSerializer types.IntType nevow.iwoven.ISerializable nevow.serial.flatstan.StringCastSerializer types.FloatType nevow.iwoven.ISerializable nevow.serial.flatstan.StringCastSerializer types.LongType nevow.iwoven.ISerializable -nevow.serial.flatstan.StringCastSerializer types.BooleanType nevow.iwoven.ISerializable +#nevow.serial.flatstan.StringCastSerializer types.BooleanType nevow.iwoven.ISerializable nevow.serial.flatstan.ListSerializer types.ListType nevow.iwoven.ISerializable nevow.serial.flatstan.StringCastSerializer types.DictType nevow.iwoven.ISerializable nevow.serial.flatstan.ListSerializer types.TupleType nevow.iwoven.ISerializable @@ -43,18 +43,18 @@ nevow.url.URLOverlaySerializer nevow.url.URLOverlay nevow.iwoven.ISerializable # Itertools uses special types -nevow.serial.flatstan.ListSerializer itertools.chain nevow.iwoven.ISerializable -nevow.serial.flatstan.ListSerializer itertools.count nevow.iwoven.ISerializable -nevow.serial.flatstan.ListSerializer itertools.cycle nevow.iwoven.ISerializable -nevow.serial.flatstan.ListSerializer itertools.dropwhile nevow.iwoven.ISerializable -nevow.serial.flatstan.ListSerializer itertools.ifilter nevow.iwoven.ISerializable -nevow.serial.flatstan.ListSerializer itertools.ifilterfalse nevow.iwoven.ISerializable -nevow.serial.flatstan.ListSerializer itertools.imap nevow.iwoven.ISerializable -nevow.serial.flatstan.ListSerializer itertools.islice nevow.iwoven.ISerializable -nevow.serial.flatstan.ListSerializer itertools.izip nevow.iwoven.ISerializable -nevow.serial.flatstan.ListSerializer itertools.repeat nevow.iwoven.ISerializable -nevow.serial.flatstan.ListSerializer itertools.starmap nevow.iwoven.ISerializable -nevow.serial.flatstan.ListSerializer itertools.takewhile nevow.iwoven.ISerializable +# nevow.serial.flatstan.ListSerializer itertools.chain nevow.iwoven.ISerializable +# nevow.serial.flatstan.ListSerializer itertools.count nevow.iwoven.ISerializable +# nevow.serial.flatstan.ListSerializer itertools.cycle nevow.iwoven.ISerializable +# nevow.serial.flatstan.ListSerializer itertools.dropwhile nevow.iwoven.ISerializable +# nevow.serial.flatstan.ListSerializer itertools.ifilter nevow.iwoven.ISerializable +# nevow.serial.flatstan.ListSerializer itertools.ifilterfalse nevow.iwoven.ISerializable +# nevow.serial.flatstan.ListSerializer itertools.imap nevow.iwoven.ISerializable +# nevow.serial.flatstan.ListSerializer itertools.islice nevow.iwoven.ISerializable +# nevow.serial.flatstan.ListSerializer itertools.izip nevow.iwoven.ISerializable +# nevow.serial.flatstan.ListSerializer itertools.repeat nevow.iwoven.ISerializable +# nevow.serial.flatstan.ListSerializer itertools.starmap nevow.iwoven.ISerializable +# nevow.serial.flatstan.ListSerializer itertools.takewhile nevow.iwoven.ISerializable # object # list Index: nevow/context.py =================================================================== RCS file: /cvs/Quotient/nevow/context.py,v retrieving revision 1.14 diff -u -r1.14 context.py --- nevow/context.py 11 Dec 2003 21:34:27 -0000 1.14 +++ nevow/context.py 17 Dec 2003 21:19:22 -0000 @@ -3,6 +3,8 @@ # and/or modify it under the terms of version 2.1 of the GNU Lesser General # Public License as published by the Free Software Foundation. +from __future__ import generators + import warnings from twisted.python import components Index: formless.py =================================================================== RCS file: /cvs/Quotient/nevow/formless.py,v retrieving revision 1.31 diff -u -r1.31 formless.py --- formless.py 2 Dec 2003 17:54:01 -0000 1.31 +++ formless.py 17 Dec 2003 21:43:42 -0000 @@ -20,10 +20,19 @@ from twisted.internet import reactor, defer -import itertools +#import itertools -nextId = itertools.count().next +#nextId = itertools.count().next + +class count(object): + def __init__(self): + self.id = 0 + def next(self): + self.id += 1 + return self.id + +nextId = count().next class InputError(Exception): @@ -562,7 +571,8 @@ """ copied = copy.deepcopy(self.typedValue.arguments) curid = 0 - for arg in copied[::-1]: + for n in xrange(len(copied)-1, -1, -1): + arg=copied[n] curid = arg.id if isinstance(arg, Button): break Index: nevow/renderer.py =================================================================== RCS file: /cvs/Quotient/nevow/renderer.py,v retrieving revision 1.27 diff -u -r1.27 renderer.py --- nevow/renderer.py 11 Dec 2003 00:48:24 -0000 1.27 +++ nevow/renderer.py 17 Dec 2003 21:19:22 -0000 @@ -4,6 +4,8 @@ # and/or modify it under the terms of version 2.1 of the GNU Lesser General # Public License as published by the Free Software Foundation. +from __future__ import generators + import os import stat import time Index: nevow/stan.py =================================================================== RCS file: /cvs/Quotient/nevow/stan.py,v retrieving revision 1.14 diff -u -r1.14 stan.py --- nevow/stan.py 11 Dec 2003 21:34:27 -0000 1.14 +++ nevow/stan.py 17 Dec 2003 21:19:22 -0000 @@ -3,6 +3,8 @@ # and/or modify it under the terms of version 2.1 of the GNU Lesser General # Public License as published by the Free Software Foundation. +from __future__ import generators + class Proto(str): """Proto is a string subclass. Instances of Proto, which are constructed Index: nevow/url.py =================================================================== RCS file: /cvs/Quotient/nevow/url.py,v retrieving revision 1.1 diff -u -r1.1 url.py --- nevow/url.py 17 Dec 2003 01:45:05 -0000 1.1 +++ nevow/url.py 17 Dec 2003 21:19:22 -0000 @@ -1,4 +1,4 @@ - +from __future__ import generators import urllib from nevow import iwoven Index: nevow/serial/flatmdom.py =================================================================== RCS file: /cvs/Quotient/nevow/serial/flatmdom.py,v retrieving revision 1.10 diff -u -r1.10 flatmdom.py --- nevow/serial/flatmdom.py 11 Dec 2003 03:22:04 -0000 1.10 +++ nevow/serial/flatmdom.py 17 Dec 2003 21:19:22 -0000 @@ -3,6 +3,8 @@ # and/or modify it under the terms of version 2.1 of the GNU Lesser General # Public License as published by the Free Software Foundation. +from __future__ import generators + from nevow.iwoven import ISerializable from nevow.stan import Tag, xml, directive Index: nevow/serial/flatstan.py =================================================================== RCS file: /cvs/Quotient/nevow/serial/flatstan.py,v retrieving revision 1.18 diff -u -r1.18 flatstan.py --- nevow/serial/flatstan.py 17 Dec 2003 01:44:39 -0000 1.18 +++ nevow/serial/flatstan.py 17 Dec 2003 21:19:22 -0000 @@ -3,7 +3,8 @@ # and/or modify it under the terms of version 2.1 of the GNU Lesser General # Public License as published by the Free Software Foundation. - +from __future__ import generators +from types import StringType import types import warnings @@ -50,7 +51,7 @@ flat = flatten(ISerializable(v).serialize(context, stream)) if flat: val = flat[0] - if isinstance(val, basestring): + if isinstance(val, StringType): val = val.replace('"', '"') yield xml(val) yield xml('"') Index: nevow/test/test_disktemplate.py =================================================================== RCS file: /cvs/Quotient/nevow/test/test_disktemplate.py,v retrieving revision 1.16 diff -u -r1.16 test_disktemplate.py --- nevow/test/test_disktemplate.py 11 Dec 2003 01:04:10 -0000 1.16 +++ nevow/test/test_disktemplate.py 17 Dec 2003 21:19:22 -0000 @@ -3,6 +3,7 @@ # and/or modify it under the terms of version 2.1 of the GNU Lesser General # Public License as published by the Free Software Foundation. +from __future__ import generators from nevow import renderer from nevow import util Index: nevow/test/test_flatstan.py =================================================================== RCS file: /cvs/Quotient/nevow/test/test_flatstan.py,v retrieving revision 1.15 diff -u -r1.15 test_flatstan.py --- nevow/test/test_flatstan.py 10 Dec 2003 19:48:49 -0000 1.15 +++ nevow/test/test_flatstan.py 17 Dec 2003 21:19:22 -0000 @@ -3,6 +3,8 @@ # and/or modify it under the terms of version 2.1 of the GNU Lesser General # Public License as published by the Free Software Foundation. +from __future__ import generators + from twisted.python import reflect from twisted.web.resource import IResource

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nevow examples
by Donovan Preston Dec. 17, 2003

Dec. 17, 2003

I have posted numerous nevow examples culled from the list and IRC conversations and posted links and short descriptions to my blog: http://www.livejournal.com/users/fzzzy/ Check them out if you are interested in nevow. dp

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guard peculiarities (with workaround)
by Douglas Bagnall Dec. 17, 2003

Dec. 17, 2003

hi, Using guard in what I believe is a fairly standard way (pilfered from some example or another), I have been getting strange results when logging in for the first time. Every field in the login form was being treated as a doubly nested repr()'d list, eg "douglas" would come back as ["['douglas']"]. As Moshe said, it looks like a [0] is missing somewhere, but AFAICT, my code floats above the level of form data, thanks I think to guard.UsernamePasswordWrapper. Anyway, the problem appears when users/htmlers, wanting to reduce clicks, copy the form into unguarded pages. It appears that guard needs an anonymous request before it will properly allow a login. Here's the log, reformatted and annotated: ## get the unguarded page with the form in it "GET / HTTP/1.1" 200 13663 "-" ## which submits correctly ('z' has empty password) "GET /admin/perspective-init? username=z &password= &submit=Login HTTP/1.1" 302 528 "http://upstage.org.nz:8083/" ## ... and bounces about "GET /admin/session-init/perspective-init? username=%5B%27z%27%5D &password=%5B%27%27%5D &submit=%5B%27Login%27%5D HTTP/1.1" 302 670 "http://upstage.org.nz:8083/" ## ...collecting square brackets... "GET /admin/__session_key__9c06c9e61ee806d13c2d43a5088ab6a2/ perspective-init? username=%5B%22%5B%27z%27%5D%22%5D &password=%5B%22%5B%27%27%5D%22%5D &submit=%5B%22%5B%27Login%27%5D%22%5D HTTP/1.1" 302 736 "http://upstage.org.nz:8083/" ## until arriving at a login error page: "GET /admin/perspective-init? username=%5B%27%5B%22%5B%5C%27z%5C%27%5D%22%5D%27%5D &password=%5B%27%5B%22%5B%5C%27%5C%27%5D%22%5D%27%5D &__session_just_started__=1 &submit=%5B%27%5B%22%5B%5C%27Login%5C%27%5D%22%5D%27%5D HTTP/1.1" 200 1153 "http://upstage.org.nz:8083/" ## Trying again, another 302 response "GET /admin/perspective-init? username=z &password= &submit=Login HTTP/1.1" 302 266 "http://upstage.org.nz:8083/" ## but the target page isn't logged, only the broken links it causes "GET /admin/img/spacer.gif HTTP/1.1" 404 165 "http://upstage.org.nz:8083/admin/" Which led me to a tacky workaround -- the first request within the guarded realm comes from a spurious image link, priming it for form submission. Like so: "GET / HTTP/1.1" 200 13752 "-" "GET /admin/img/spacer.gif HTTP/1.1" 302 384 "GET /admin/session-init/img/spacer.gif HTTP/1.1" 302 "GET /admin/__session_key__2a0d[ ... ]/img/spacer.gif HTTP/1.1" 302 "GET /admin/img/spacer.gif?__session_just_started__=1 HTTP/1.1" 200 488 However, this seems a little ridiculous. Is there a good reason why people shouldn't be able to login first time? On this site, some of the pages have to be plain unwoven html, with hard-coded forms and whatnot, so the people maintaining those pages can understand it. cheers, douglas # cut down a bit for clarity def website(): """Returns the web tree.""" docroot = static.File(config.HTDOCS) admin = adminWrapper(config.ADMIN) docroot.putChild('admin', admin) return docroot class AdminRealm: __implements__ = IRealm def __init__(self,admin_dir): self.anonResource = AdminLoginPage() self.admin_dir = admin_dir def requestAvatar(self, username, mind, *interfaces): if IResource not in interfaces: raise NotImplementedError("WTF, tried non-web login") if username and player_dict[username].can_admin(): tree = static.File(self.admin_dir) tree.putChild('new', ActionDir(new_thing, username)) tree.putChild('edit', ActionDir(EditThings, username)) tree.putChild('manage', ActionDir(ManageThings, username)) tree.putChild('save_thing', SwfConversionWrapper()) tree.putChild('save_video', VideoThing()) tree.putChild('id', SessionID(username)) tree.putChild('error',AdminError('deliberate error')) return (IResource, tree, lambda : None) elif username: #player, but not admin. nontree = static.File(self.admin_dir + 'nonadmin/') nontree.putChild('id', SessionID(username)) return (IResource, nontree, lambda : None) else: #anon - the audience. self.anonResource.putChild('id', SessionID()) return IResource, self.anonResource , lambda : None def adminWrapper(admin_dir): p = Portal(AdminRealm(admin_dir)) p.registerChecker(AllowAnonymousAccess(), IAnonymous) p.registerChecker(InMemoryUsernamePasswordDatabaseDontUse(z='')) ##p.registerChecker(player_dict) upw = guard.UsernamePasswordWrapper(p, callback=dumbRedirect) r = guard.SessionWrapper(upw) r.sessionLifetime = 6 * 3600 return r

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Session trouble
by Michal Pasternak Dec. 17, 2003

Dec. 17, 2003

Hi, On a page of the site I've got a form. The user enters values and submits the form. Entered values are saved to session. If s/he gets back to the page (=> encounters the same form), values are loaded from the session and the form is filled with them. Everything worked okay, until I turned on caching. Now, even if the test machine is on different subnet, the filled values are presented to all connected users by default (eg. my friend, while testing it, enters some data; I open a "clean" browser, without any cookies or such, enter the page with the form - and I get the same data he entered!). My question is simple: how do I get around this? If I turn off caching, everything is fine - but I need caching. It speeds up things a lot. Is it known issue? What am I doing wrong? Where should I RTFM? I run the site server with twistd and RPY script. This is my RPY script: cache() import myWeb resource = myWeb.RootPage() This is how I save / load session values in myWeb: I have declared: class IPreferences(components.Interface): pass class Preferences(components.Adapter): __implements__ = IPreferences components.registerAdapter(Preferences, server.Session, IPreferences) Then, when I'm loading/saving values from/to session, I use: prefs = req.getSession(IPreferences) saving values to session: prefs.foobar = 5 loading values from session: a = prefs.foobar -- Michal Pasternak :: http://pasternak.w.lub.pl :: http://winsrc.sf.net

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Q: Hidden field in TypedInterface?
by Samuel Reynolds Dec. 16, 2003

Dec. 16, 2003

In a formless.TypedInterface, how does one specify a "hidden" parameter (i.e., force generation of a 'hidden' input widget in the generated form)? E.g., in : class IMyProxy(formless.TypedInterface): class PropertyGroup(formless.TypedInterface): id = formless.Integer() subject = formless.String() How to make id become a hidden field <input type='hidden' value ='...' name='id' /> ? - Sam

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Should an error hang the server?
by Greg Lappen Dec. 16, 2003

Dec. 16, 2003

I am playing with some twisted-web and woven stuff. I noticed that whenever I get an error page, the server no longer handles requests. Is this the intended behavior? Greg

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Woven Input Problem cont.
by orya＠bgumail.bgu.ac.il Dec. 16, 2003

Dec. 16, 2003

> sorry, > > rest of scenario: > > > > > where foo returns an instance of "0" and "0" has a getData() method, > which returns data from remote http server (returning a Deffered) > > all this leads to inf. loop of the getData() > how do i get out of it?????????? >You need to cache the value passed to setData so that a call to >getData >immediately after it returns that same value. 1. Thank you for your answer, where do i need to cache the data of setData()? 2. If i want to use getData() to retrieve data from a remote server, present it on an input field and then change it and submit using setData() am i expected to encounter the same problem? how can i avoid it? dp

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New Guard
by orya＠bgumail.bgu.ac.il Dec. 16, 2003

Dec. 16, 2003

Hi Justin or anyone else , tahnks for your reply can you again attach the guarded.tac file ...

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Woven Input Problem cont.
by orya＠bgumail.bgu.ac.il Dec. 15, 2003

Dec. 15, 2003

sorry, rest of scenario: where foo returns an instance of "0" and "0" has a getData() method, which returns data from remote http server (returning a Deffered) all this leads to inf. loop of the getData() how do i get out of it??????????

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TypedInterface implementation returned in a render_ method
by Justin Johnson Dec. 15, 2003

Dec. 15, 2003

I have the following render_main method which returns the current tag, but specifies an implementation of a TypedInterface as 'data', and freeform.configure as a child node. def render_main(self, context, data): if "mkvob" in self.selected_menu_items: return context.tag(data=forms.MkvobForm())[ freeform.configure ] else: return Base.render_main(self, context, data) The TypedInterface is defined as follows: class IMkvobForm(formless.TypedInterface): def do_mkvob(self, request=formless.Request(), tag=typed.VobTags(), site=typed.Sites(), other_sites=typed.Sites()): """Make a VOB Make a ClearCase VOB. """ do_mkvob = formless.autocallable(do_mkvob) class MkvobForm(object): __implements__ = IMkvobForm, def do_mkvob(self, request, tag, site, other_sites): vobs = tag.split(",") other_sites = other_sites.split(",") print "DEBUG: locals() = " + str(locals()) Redirect("/") Eventually this will do something useful. This code succeeds in displaying the form when I select the mkvob menu item. However, when I click submit, I get the following error before the Type coerce methods are called. 2003/12/15 09:16 Central Standard Time [HTTPChannel,1,127.0.0.1] Traceback (most recent call last): File "C:\Python23\Lib\site-packages\twisted\protocols\http.py", line 1 000, in rawDataReceived self.allContentReceived() File "C:\Python23\Lib\site-packages\twisted\protocols\http.py", line 9 91, in allContentReceived req.requestReceived(command, path, version) File "C:\Python23\Lib\site-packages\twisted\protocols\http.py", line 5 49, in requestReceived self.process() File "C:\svn\Quotient\nevow\appserver.py", line 99, in process return server.Request.process(self) --- <exception caught here> --- File "C:\Python23\Lib\site-packages\twisted\web\server.py", line 158, in process resrc = self.site.getResourceFor(self) File "C:\svn\Quotient\nevow\appserver.py", line 125, in getResourceFor res = gener.getResourceForRequest(request) File "C:\svn\Quotient\nevow\appserver.py", line 50, in getResourceForR equest return self.postForm(request, res, configurable, ctx, bindingName, r equest.args) File "C:\svn\Quotient\nevow\appserver.py", line 53, in postForm return configurable.postForm(ctx, bindingName, args) File "C:\svn\Quotient\nevow\freeform.py", line 731, in postForm binding = configurable.getBinding(ctx, seg) File "C:\svn\Quotient\nevow\freeform.py", line 796, in getBinding raise ImproperInputError, self.original nevow.freeform.ImproperInputError: An unconfigurable object (None) Does anyone know what I'm doing wrong here? Thanks. -Justin

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