Mailman 3 November 2004 - Twisted-web

dynamic nevow example-listing
by Siegmund Fuehringer 16 Nov '04

16 Nov '04

hi all! i like the idea of nevow example listing that was written a few hours ago. it would be cool to just run a livedemo of the examples somewhere like divmod.org/nevow.com. :) but what about implementing it in a more dynamic way like: http://www.sifu.info/exampleBrowser.tgz than there is no need to always edit the index.html file when you add a new one. it would be necessary though to place every example in its own directory (would be nice anyways to see which files belongs to which examples) and add a __init__.py with a litte metadata. a little docu for each example would probably also not hurt too much :) the example implementation above is just very a crude hack (will not even run on windows), because i did not want to invest hours before i know what you think about it. greetings - sifu

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WebDAV client library?
by Morgen Sagen 15 Nov '04

15 Nov '04

I've searched the Twisted site/source but haven't seen a reference to a Twisted WebDAV client library. Does this yet exist? Thanks, ~morgen

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Re: [Twisted-web] reverse proxy with nevow
by Mike Mueller 12 Nov '04

12 Nov '04

At 09:57 11.11.2004 +0100, you wrote: >Hi Mike, > >in just a bit I'll have to set up a reverse proxy with url rewriting. Do >you mind to share your setup? (and can I post it on the devel list of >OpenPortalGuard (openportalguard.sf.net))? > >many thanks >-b Here is my version. It serves static files from subdirectories in a given directory. The names of the subdirectories correspond to the domain names. In the example below, this is just domain1.com but it could be more domains. The reverse proxy part redirects all requests to domains2.com to port 8080 on the same machine. So instead using domain2.com:8080 you can use domain2.com directly (that is on port 80). The source for my server on port 80 looks like this: #twistedStaticServer.py from twisted.web import vhost, static, server, proxy from twisted.application import internet, service import os # use this path to put several subdirectories # the name of each subdirectory is used as a domain name vhostDir = '..\hosts' root = vhost.NameVirtualHost() dir = 'domain1.com' # making all files in ..\hosts\domain1.com\ available # as static pages, just put your html files there root.addHost(dir, static.File(os.path.join(vhostDir, dir))) # now the reverse proxy part vhostName = 'domain2.com' # there is another server listening at 8080 reverseProxy = proxy.ReverseProxyResource('localhost', 8080, '') # just add it to root and tell that it is a reverseProxy root.addHost(vhostName, reverseProxy) application = service.Application('web') sc = service.IServiceCollection(application) site = server.Site(root) i = internet.TCPServer(80, site) i.setServiceParent(sc) For this to work you have to have a directory ../hosts/domain1.com and of course put the lines 127.0.0.1 domain1.com 127.0.0.1 domain2.com in your /etc/hosts. The source for the reverse proxy looks like this: #nevowProxy.py import random from nevow import appserver, vhost from twisted.application import internet, service from nevow import rend, tags from nevow import loaders vResource = vhost.VHostMonsterResource() class VHostGreeter(rend.Page): docFactory = loaders.stan( tags.html[ tags.head[ tags.title[ "Runnig as VHostMonsterResource" ]], tags.body[ tags.h1(style="font-size: large")[ "This works." ] ] ]) root = VHostGreeter() #just add child as nevow.vhost.VHostMonsterResource() root.putChild("vhost", vResource) application = service.Application('web-proxy') sc = service.IServiceCollection(application) site = appserver.NevowSite(root) i = internet.TCPServer(8080, site) i.setServiceParent(sc) The server listens on port 8080 and can still be directly accessed via domain2.com:8080. But it also works behind the static server. In this case it means the bowser just shows domain2.com. That's what I wanted. You might need to adapt to your needs. HTH, Mike

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Custom 404, 500 pages only work with stan docFactory, not xml
by Cory Dodt 11 Nov '04

11 Nov '04

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On the Wiki, I posted (quite some time ago) a working example of putting your own 404 and 500 pages in place of the plain-jane defaults. The example still works, and is at: http://divmod.org/users/wiki.twistd/nevow/moin.cgi/Custom404Page - -- However, at the same time I wrote that, I discovered that I cannot satisfy my own use case, which is custom error pages built with xml*, because of some bug in how Nevow selects the page context to render. I have tried to find a patch for this myself, but it just isn't happening. Too much about context is still mysterious to me :-/ Compare the minimal example below to the wiki page above. The wiki works, this one does not. When you visit OopsPage, you should see a link to take you back to the root page. Instead, in that spot you get an error message saying render_lastLink can't be found. Thanks for looking :-) - -- from nevow import appserver, rend, loaders, tags as T, inevow from twisted.application import service, internet class The500Page(rend.Page): ~ __implements__ = (inevow.ICanHandleException,) ~ docFactory = loaders.xmlstr("""\ <html xmlns:n="http://nevow.com/ns/nevow/0.1"> ~ <head> ~ <title>500 error</title> ~ </head> ~ <body> ~ <h1>Ouchie. Server error.</h1> ~ <p>The server is down.</p> ~ <p>Ohhh, the server.</p> ~ <p n:render="lastLink" /> ~ </body> </html>""") ~ def renderHTTP_exception(self, ctx, failure): ~ inevow.IRequest(ctx).setResponseCode(500) ~ self.renderHTTP(ctx) ~ def render_lastLink(ctx, data): ~ referer = inevow.IRequest(ctx).getHeader('referer') ~ if referer: ~ return T.p[T.a(href=referer)['This link'], ~ ' will return you to the last page you were on.'] ~ else: ~ return T.p['You seem to be hopelessly lost.'] the500page = The500Page() class OopsPage(rend.Page): ~ def exception(self, ctx, data): ~ 1/0 # cause an exception on purpose ~ docFactory = loaders.stan(exception) class RootPage(rend.Page): ~ docFactory = loaders.stan( ~ T.html[T.head[T.title["Error Pages"]], ~ T.body[T.h1["The Only Real Page"], ~ T.a(href="oops")[ ~ "This link causes an exception!"], ~ ]] ~ ) ~ def locateChild(self, ctx, segments): ~ ctx.remember(the500page, inevow.ICanHandleException) ~ return rend.Page.locateChild(self, ctx, segments) application = service.Application("errorpages") root = RootPage() root.putChild('oops', OopsPage()) svc = internet.TCPServer(8080, appserver.NevowSite(root)) svc.setServiceParent(application) -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.1 (MingW32) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iD8DBQFBk8V93A5SrXAiHQcRArxIAJ9Vqr0BzwGhYVSPX7axH6oOu4TpNACdGdIl 0e9KXLYrky8FhmnTJnbr424= =P9Cq -----END PGP SIGNATURE-----

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getting response headers from client.getPage
by Lars Woetmann Pedersen 11 Nov '04

11 Nov '04

hi how do I get the responce header in printResult the code looks like this now, the content of the page is in data, but I also need the header to check the etag and last-modified d = client.getPage(myurl) d.addCallback(printResult) def printResult(data): print 'printing result:' print data Lars W.

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reverse proxy with nevow
by Mike Mueller 10 Nov '04

10 Nov '04

After fiddling for quite a while I am running out of ideas how get the following to work. I would like to run a nevow site on port 8080 on the same machine I run a twisted web server that serves static pages. Instead of showing the 8080 in the address I would like to run the nevow site as VHostMonsterResource. My twisted web server looks like this: #twistedStaticServer.py from twisted.web import vhost, static, server, proxy from twisted.application import internet, service import os vhostDir = '..\hosts' root = vhost.NameVirtualHost() dir = 'domain1.com' root.addHost(dir, static.File(os.path.join(vhostDir, dir))) vhostName = 'domain2.com' reverseProxy = proxy.ReverseProxyResource('localhost', 8080, '/vhost/http/'+vhostName) root.addHost(vhostName, reverseProxy) application = service.Application('web') sc = service.IServiceCollection(application) site = server.Site(root) i = internet.TCPServer(80, site) i.setServiceParent(sc) The nevow site looks like this: #nevowProxy.py import random from nevow import appserver, vhost from twisted.application import internet, service from nevow import rend, tags from nevow import loaders vResource = vhost.VHostMonsterResource() class VHostGreeter(rend.Page): docFactory = loaders.stan( tags.html[ tags.head[ tags.title[ "Runnig as VHostMonsterResource" ]], tags.body[ tags.h1(style="font-size: large")[ "This works." ] ] ]) default = VHostGreeter() default.putChild("vhost", vResource) application = service.Application('web-proxy') sc = service.IServiceCollection(application) site = appserver.NevowSite(default) i = internet.TCPServer(8080, site) i.setServiceParent(sc) After modifying /etc/hosts (or C:\WINNT\system32\drivers\etc\hosts): 127.0.0.1 domain1.com 127.0.0.1 domain2.com domain1.com works as expected. It serves static pages out of the given directory. Also domain2.com:8080 works. But domain2.com just shows an empty page. I tested this with Opera 7.11 and IE 6.0. The nevow server gets an GET request. There is no difference in the server messages between a direct call (8080) or using it as a reverse proxy: Opera: domain2.com: 2004/11/07 13:06 Westeuropõische Normalzeit [HTTPChannel,1,127.0.0.1] 127.0.0.1 - - [07/Nov/2004:12:06:20 +0000] "GET / HTTP/1.0" 200 129 "-" "Mozilla/4.0 (comp atible; MSIE 6.0; Windows NT 5.0) Opera 7.11 [de]" domain2.com:8080: 2004/11/07 13:06 Westeuropõische Normalzeit [HTTPChannel,2,127.0.0.1] 127.0.0.1 - - [07/Nov/2004:12:06:32 +0000] "GET / HTTP/1.1" 200 129 "-" "Mozilla/4.0 (comp atible; MSIE 6.0; Windows NT 5.0) Opera 7.11 [de]" IE6.0: domain2.com: 2004/11/07 13:07 Westeuropõische Normalzeit [HTTPChannel,3,127.0.0.1] 127.0.0.1 - - [07/Nov/2004:12:07:25 +0000] "GET / HTTP/1.1" 200 129 "-" "Mozilla/4.0 (comp atible; MSIE 6.0; Windows NT 5.0)" domain2.com:8080: 2004/11/07 13:07 Westeuropõische Normalzeit [HTTPChannel,4,127.0.0.1] 127.0.0.1 - - [07/Nov/2004:12:07:46 +0000] "GET / HTTP/1.1" 200 129 "-" "Mozilla/4.0 (comp atible; MSIE 6.0; Windows NT 5.0)" The twisted web server shows the following messages: 2004/11/07 13:07 Westeuropõische Normalzeit [HTTPChannel,2,127.0.0.1] Starting f actory <twisted.web.proxy.ProxyClientFactory instance at 0x00B716E8> 2004/11/07 13:07 Westeuropõische Normalzeit [ProxyClient,client] Stopping factor y <twisted.web.proxy.ProxyClientFactory instance at 0x00B716E8> How do get the page display when requesting domain2.com? Thanks. Mike

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Problem using formless with a deferred value
by Gavrie Philipson 10 Nov '04

10 Nov '04

Hi, I am having a peculiar problem related to using a deferred value together with Nevow's formless: When trying to return a deferred value from a formless autocallable, no result is returned to the browser even though the deferred does fire. Attached is an example, based on the "formpost2.tac" example from the Nevow distribution, that illustrates the problem: Submitting the form causes the deferred to fire, but the browser hangs while waiting for the result (which is never sent). I have tested this with the latest Nevow version from Subversion (updated today), together with both Twisted 1.3.0 and 1.1.0. The platform is Fedora Core 1, with Python 2.3.2. This deferred-with-formless functionality used to work for me using an older version of Nevow (pre-0.1), but upgrading seems to have broken it. Am I doing something wrong here, or is this a bug in Twisted or Nevow? Thanks, -- Gavrie.

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Add fromContext to nevow.url and add a warning to fromRequest
by Matt Goodall 09 Nov '04

09 Nov '04

Hi, I've mentioned this issue but I find some of the nevow.url module non-obvious mostly because of naming. fromRequest is one of the methods I dislike because its name implies (to me, at least) that it will build a URI that matches the request but it actually uses the prepath. Attached is an initial patch (i.e. not tested) that adds a fromContext class method and displays a warning for fromRequest. My intention is to change fromRequest sometime in the future so it builds a URL from request.uri. What do you all think of this change? Cheers, Matt -- __ / \__ Matt Goodall, Pollenation Internet Ltd \__/ \ w: http://www.pollenation.net __/ \__/ e: matt(a)pollenation.net / \__/ \ t: +44 (0)113 2252500 \__/ \__/ / \ Any views expressed are my own and do not necessarily \__/ reflect the views of my employer.

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RE: [Twisted-web] Problem using formless with a deferred value
by Gavrie Philipson 09 Nov '04

09 Nov '04

Tommi Virtanen wrote: > Gavrie Philipson wrote: > >> Am I doing something wrong here, or is this a bug in Twisted or >> Nevow? >> >> > The former. ... > Your _cb is in no way connected to the Deferred. Doh! Of course -- I must have been zoned out. This example was just meant to demonstrate the recreation of an actual problem which I have in a larger application. I didn't pay enough attention when rewriting the example. I'm back to trying to reproduce the original problem... -- Gavrie.

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RE: [Twisted-Python] Log in - state of the art?
by Alexander May 07 Nov '04

07 Nov '04

Thanks Mike and Donovan. The examples were very helpful. Two questions though: 1) If the user types in something like mysite.com/foo/bar and is not yet logged in, they get the "Sorry, but I couldn't find the object you requested." page. I would like them to get the log in page, and then be redirected to the mysite.com/foo/bar afterwards. Can I do this? 2) How do I replace the "Sorry, but I couldn't find the object you requested." with my own page? Thanks, Alex (cross posted to twisted web group) -----Original Message----- From: twisted-python-bounces(a)twistedmatrix.com [mailto:twisted-python-bounces@twistedmatrix.com] On Behalf Of Mike C. Fletcher Sent: Friday, November 05, 2004 2:55 PM To: Twisted general discussion Subject: Re: [Twisted-Python] Log in - state of the art? I did up a few howtos in my blog a while back: http://blog.vrplumber.com/356 http://blog.vrplumber.com/358 http://blog.vrplumber.com/371 which covers the "official" way to protect a Nevow site (as gleaned from IRC conversations with Nevow's creators). I think Mary was planning on doing up official docs for the process at some point. HTH, Mike Alexander May wrote: ... >What modules and classes should I be looking at? Are there any >examples out there? Is the how-to on the website >(http://twistedmatrix.com/documents/current/howto/cred) up to date? > > ... ________________________________________________ Mike C. Fletcher Designer, VR Plumber, Coder http://www.vrplumber.com http://blog.vrplumber.com _______________________________________________ Twisted-Python mailing list Twisted-Python(a)twistedmatrix.com http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python

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