Twisted-web May 2005

twisted-web@python.org

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Test
by Philippe Lafoucrière 05 Aug '21

05 Aug '21

Hi all just a test

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Livepage, ClientHandle and context
by Thomas HERVE 06 Jun '05

06 Jun '05

I've just started to use nevow i18n and I'm pretty happy with it, it works very well and the automatic detection of browser language is invisible. But my app uses livepage a lot, and I began to face problems when trying to translate strings in "dynamic renderers". After some investigations, I found my problem : i18n uses the i18nconfig saved in context to translate strings, but livepage.ClientHandle makes a new "fake" context for each calls via the livepage.flt function. I resolved my problem by creating my ClientHandle and ClientHandleFactory implementations, the ClientHandle saving the context at its creation (pretty easy, but I would have found it cleaner if clientHandleFactory was a class variable of LivePage, Input and Output, and not a module global). Thus, the i18nconfig remains in context. My question is : is this choice good, or is there a good reason for ClientHandle not to keep track of the context ? If not, wouldn't it be better to save context in ClientHandle (it would useful for others things, getting session for example) ? -- Thomas

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ReverseProxy subpath
by Siegmund Fuehringer 01 Jun '05

01 Jun '05

hi! i would like to setup a reverse proxy, which serves the root of an internal server as '/subpath' of the external server: http://external.org/subpath -> http://internal.org/ but i can't get it to work. my current setup requires that the internal server also serves the content as '/subpath': root.putChild( 'subpath', ReverseProxyResource( '127.0.0.1', 6080, '/vhost/http/external.org:80/subpath' ) ) is there a way to achieve, what i would like to have? thank you, sifu

2 1

canceling long running soap requests
by Erik Swan 31 May '05

31 May '05

Greetings, i have a twisted app (v1.3) that makes soap requests to another non- twisted server to build pages. Sometimes these requests can take a long time and i need to provide a cancel mechanism that sends a second "cancel" soap message. In my current implementation the UI is blocked until the request completes. I looked into how to make the SOAP proxy defer my client requests and i tried to make a second TCPServer on another port to try and get my cancel requests out the door. Any suggestions on how to best implement? Kind regards, e. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Erik Swan Splunk Technology splunk > Taking the sh out of IT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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twisted web and "Method Not Allowed"
by John Que 31 May '05

31 May '05

Hello, I had posted this question in a different twisted mailing list but did not got a solution ; I hope that maybe members of this forum can help me a bit. I am trying the exmaple in the python docs - http://twistedmatrix.com/users/warner/doc-latest/web/howto/using-twis... Configuring and Using the Twisted.Web Server - Twisted Web Development. it says there: "You can also create a Site instance by hand, passing it a Resource object which will serve as the root of the site: from twisted.web import server, resource from twisted.internet import reactor class Simple(resource.Resource): isLeaf = True def render_GET(self, request): return "<html>Hello, world!</html>" site = server.Site(Simple()) reactor.listenTCP(8080, site) reactor.run() " So I prepared a script named myhttp exactly like this and ran ./myhttp I had made sure with netstat that indeed port 8080 was free before running the script and after running the script it was in a listening state. But when pointing the Mozilla browser to http://localhost:8080 (or http://127.0.0.1:8080) I got the following error: "Method Not Allowed Your browser approached me (at /) with the method "GET". I only allow the method here." I had also made sure that there in no problem with iptables and that the iptable service is down. I had also tried: telnet localhost 8080 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. GET / HTTP/1.0 And I got this as a response: HTTP/1.0 405 Method Not Allowed Date: Tue, 31 May 2005 13:45:29 GMT Content-length: 242 Content-type: text/html Allow: () Server: TwistedWeb/2.0.0 <html> <head><title>405 - Method Not Allowed</title></head> <body><h1>Method Not Allowed</h1> <p>Your browser approached me (at /) with the method "GET". I only allow the method here.</p> </body></html> Connection closed by foreign host. Tracing this error shows that this it stems from twisted/web/server.py. I also tried it on a second machine with the latest stable releases (TwistedWeb-0.5.0, Twisted-2.0.1 , Python-2.4.1, and ZopeInterface-3.0.1) and I got the same error. I am trying it on RedHat 9 Linux (x386 based). Any idea ? Am I missing something? Any help will be appreciated. Regards, John _________________________________________________________________ Express yourself instantly with MSN Messenger! Download today it's FREE! http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/

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Proxy Socksv5
by Lilliput 29 May '05

29 May '05

Hello, I would like to know if there is any plan soon or later to get a SocksV5 api. It would be great to be able to use for the authentification and the UDP possibilities. I might add that almost all new network application supporting a proxy feature have the v5. Thanks very much Regards Fabien -- _ ( >- /~\ F. Bourdaire | \) \_|_ http://www.saycure.com

3 5

HELP! Formless and default values of a widgets
by Little 29 May '05

29 May '05

How can i set default value to a widget, if it must be looked up from a database? --- class ISomething(annotate.TypedInterface): def doSomething( self, ctx = annotate.Context(), foo = annotate.String(*default="this string must be taked from a database at render time"*), ): """Do Something Really Exciting ---

2 2

Nevow upgrading trouble 2.0 ->4.1
by Yun Mao 29 May '05

29 May '05

The following template doesn't work any more (worked with 2.0). In particular, my own render_status() and render_message() don't get called any more. This was my first and only nevow program. So, my relevant knowledge is quite limited. Is there any major changes between those versions? Any suggestions will be appreciated!! Yun =====begin HTML template======== <table border="0" cellspacing="1" width="90%"> <tr> <td class="grey" width="5%">ID</td>  <td class="grey" align="center">remote host</td> <td class="grey" align="center">home agent</td> <td class="grey" align="center">status</td> <td class="grey" align="center">messages</td> <td class="grey" align="center">last error</td> <td class="grey" align="center" width="10%"> <a nevow:data="globalSSLOption" href="?switchSSL=-1" nevow:render="string" title="Click to switch smart SSL option">SSL</a></td> </tr> <span nevow:data="session" nevow:render="sequence"> <tr nevow:pattern="item" nevow:render="mymapping"> <td class="blue"><nevow:slot name="myID" /></td> <td class="blue"><nevow:slot name="remotehost" /></td> <td class="blue"><nevow:slot name="homeagent" /></td> <td class="blue" align="center"><a nevow:pattern="status" nevow:render="status">running</a></td> <td class="blue"><a nevow:pattern="messageItem" nevow:render="message" href="?"> message</a> </td> <td class="blue"><nevow:slot name="error" /></td> <td class="blue" align="center"><a nevow:pattern="SSLOption" nevow:render="SSLOption">Disabled</a></td> </tr> </span> </table> ======END html template=========

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RE: [Twisted-Python] Chat by html application
by Harald.Nyman＠astrazeneca.com 27 May '05

27 May '05

Hi Tibi, Nevow is probably the best. But there are other ways too. I've been doing this for several years with a Tomcat servlet, and then there was no Nevow. After converting to Pythonism, I switched to a Twisted server. Haven't learned Nevow yet, despite good intentions..., but I think this may be similar. It's essentially doing all of "What I want to do:" below, only I'm not using it mainly for chat, but for distributing HTML or Javascript, for viewing things together during a phone meeting. - the browser's background HTTPRequest sits in a threaded applet - someone switches on "collaboration" in his browser - the others see his name being added to the "virtual meeting" - one user drags a pointer (image) in his browser -> the pointer moves in the other browsers See also some A's to your Q's, below. Harald On 5/26/05, Tibi Dondera <incoming(a)pronet-romania.com> wrote: > Hello all, > > I'm trying to develop a chat application through a browser, using > twisted (if possible) > What I want to do: > - a user logs in the website > - he goes to the "chat page" > - he has the "classic" chat interface (sent messages, list of online > users, "send a message" field). All of these are simple "divs" > - when he sends a message, a post with the message is submitted to the > server, and registered in a temporary database table (or in memory, is > there some "temporary" memory that I can use in twisted for this purpose > ?) > - for refreshing the chat area, there is an open HTTPRequest in the > background. Twisted will do the following: > - accept the HTTPrequest connection > - keep it alive (i.e. do not send the answer, but maybe send some > empty chars to force the browser to keep the connection open) > - when a new message (from the other users) is available, send it > to the user and close the connection. > - in the user's browser, when the connection is closed (either with a > message, or after a certain timeout, that cannot be avoided anyway), a > new one will be opened, until the user quits the chat. > > Questions: > - Is this a plausible solution ? Yes, IMHO. > - Has this already been implemented (or at least partly) ? > - Can this actually be done with twisted ? Yes. > - Can I develop this on Windows ? (production will be on linux, but > still, I prefer developing local, and currently on windows) Hmm.. I develop "on Windows", but with a VMWare Linux server on the same laptop. Works great, but costs a bit. Should work with the server on Windows, too(?) > - Can you give me any pointers to some existing code, or where to start > ? (maybe jabber for twisted ?) Here's a few fragments from my server code - class Servlet(resource.Resource): ... # Send queued output to browser's background listener def render_GET(self, request): self.request = request session = request.getSession() ... anything = 0 while not session.outqueue.empty(): x = session.outqueue.get() request.transport.write(x) anything = 1 if anything: request.finish() return server.NOT_DONE_YET def render_POST(self, request): session = request.getSession() # Browser sends a dictionary as text msgDict = eval(request.args['message'][0]) request.finish() message = msgDict['message'] mSplit = message.split() ... # Do work here return server.NOT_DONE_YET > - How will a twisted http server coexist with my existing apache server > on the 80 port ? Not well, I guess. I use a different port for the Twisted server. > - Must I subscribe to the twisted-http mailing list instead and ask this > question there ? Twisted-web would be better, yes. I'm posting this one there too, with all due apologies... > > Thanks for any help. > > Tibi Dondera _______________________________________________ Twisted-Python mailing list Twisted-Python(a)twistedmatrix.com http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python

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Announce : TwistedCherry 0.0.2
by Thomas Weholt 27 May '05

27 May '05

TwistedCherry is a very simple proof-of-concept project to show CherryPy-like development methods using the Twisted HTTP-server. Note ! TwistedCherry has so far only been tested with Twisted 1.3.0 and actually not been tested much at all. Run test_server.py and surf to http://localhost:8080 for a ( hopefully ) running example server. The code isn't 100% CherryPy, but sort of a mix of Twisted, CherryPy and then some. You'll also need CheetahTemplate-system for the test-server to run. Anyway, I'd be glad for any comments or ideas you might have and as you'll probably see from the code I'm not the greatest Twisted-hacker alive today ;-) Download http://www.mrmuffin.net/software/TwistedCherry-0.0.2.tgz References : http://www.cherrypy.org http://cheetahtemplate.sourceforge.net/ -- Mvh/Best regards, Thomas Weholt http://www.weholt.org

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Twisted-web May 2005