Mailman 3 June 2008 - Twisted-web

Test
by Philippe Lafoucrière 05 Aug '21

05 Aug '21

Hi all just a test

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Twisted Hosting and Twisted in the Cloud
by Duncan McGreggor 09 Jul '08

09 Jul '08

Hey everyone, Divmod's been talking to various hosting companies about potential Twisted deals (and maybe even support). I wanted to get a gauge of people's level of interest in the services we've been discussing. We're currently looking at the following options: * Dedicated hosts, with Twisted libs pre-installed on them * Virtual hosts/"slices" with Twisted libs pre-installed on them * Clouds that support uploading and running Twisted apps * Potential support contracts where Divmod engineers provide high-level assistance for paying customers * Becoming a reseller and offering these services directly through Divmod I've been approached privately by a few developers who use Twisted in their projects at home and at work with questions about Twisted hosting. They've been interested to know if 1) Divmod does Twisted hosting, 2) anyone provides "out of the box" support for Twisted, and 3) who we recommend. I know that as the years pass, I have less and less time to manage my own systems responsibly. After 6 years, I'm closing down my colocated boxes. When Twisted makes it to the cloud, I'll close down my virtual hosts, too. I just don't have the time any more. All I need is reliable uptime for my apps (most of them are just sites with dynamic content). How many others on these lists feel that they would benefit from the ease of pre-installed Twisted and/or support for Twisted apps in the cloud? If you do, what kinds of apps (that you are currently running) do you want to be able to run in such environments? Simple web sites? DNS servers? Game servers? Chat applications? Web/data services apps? And lastly, what hosting companies are your favorites? Where would you be happiest, if they supported Twisted? Would you consider switching to a hosting provider that *did* support Twisted? Looking forward to hearing the people speak, d

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nevow's loaders.xmlfile returning XML
by Abdul-Wahid Paterson 05 Jul '08

05 Jul '08

Hi, I am a bit confused about loaders.xmlfile() method and what it is donig to my XML templates. It seems to be HTMLifying my XML by doing things like stripping the / out of <br />. I am trying to develop some pages where I have inline SVG in the code. My static XHTML files work fine but the code returned from nevow does not work. How can I get nevow to return XHTML and not HTML? How can I put the HTML namespace into my returned XHTM? Regards, Abdul-Wahid

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xmlrpc resource file descriptor leak
by Phil Mayers 03 Jul '08

03 Jul '08

This is a bit vague, and I wanted to get some feedback before I submit a ticket. We have a long-running twisted / nevow process that basically has: root \- RPC2 - a twisted.web.xmlrpc.XMLRPC sub-class \- ui - nevow pages The thing hung up over the weekend with "too many open file descriptors" and before I killed it I did an "lsof"; lots of the files were: python25 20163 nsg 31u REG 253,0 370 3276854 /tmp/tmp5QJivu (deleted) ...and "cat /proc/20163/fd/31" shows: <?xml version='1.0'?> <methodCall> <methodName>classify_maclist</methodName> <params> <param> <value><string>HORPROD</string></value> </param> <param> <value><array><data> <value><string>xxxx</string></value> </data></array></value> </param> <param> <value><int>-1</int></value> </param> <param> <value><int>5</int></value> </param> </params> </methodCall> ...which is an XMLRPC call from a Zope server on another machine to this process. I presume the t.w.http.Request content is getting written to a tempfile, but I can't understand why - the Content-Length is tiny (<400 bytes). I can't seem to reproduce this in a sample application though; does anyone have any ideas how I can narrow down the problem?

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Multiple choice with formless
by Yasushi Iwata 28 Jun '08

28 Jun '08

Hi, I'm using Nevow. How do I write multiple choice (checkbox) with formless? Should I use formal.widget.CheckboxMultiChoice? http://forms-project.pollenation.net/cgi-bin/trac.cgi/browser/trunk/formal/…

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Redirect problem
by tarjei 27 Jun '08

27 Jun '08

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi, using Nevow, I want to send an extra header X-objectId to the client when the client has posted an image to a page. My problem is that when I do a post, the client returns the headers (including mine) but then hangs partly out into the request. Example: curl http://localhost:8000/store/ -F image=@./globalwarming.jpg HTTP/1.1 302 Found Content-length: 391 Content-type: application/xml Accept-ranges: bytes Server: TwistedWeb/8.1.0 Last-modified: Fri, 20 Jun 2008 10:42:22 GMT Location: /info/2008/6/20/f/f95556fd25cc4a8a8cb87b7453bbd0de/f95556fd25cc4a8a8cb87b7453bbd0de.jpg Date: Fri, 20 Jun 2008 10:42:22 GMT X-objectId: 2008/6/20/f/f95556fd25cc4a8a8cb87b7453bbd0de/f95556fd25cc4a8a8cb87b7453bbd0de.jpg <imageMetadata><property name="width" value="934" /><property name="extension" value=".jpg" /><property name="format" value="JPEG" /><property name="colour" value="768" /><property name="height" value="524" /><property name="id" value="2008/6/20/f/f95556fd25cc4a8a8cb87b7453bbd0de/f95556fd25cc4a8a8cb87b7453bbd0de.jpg" /><property name="filename" value="globalwarming.jpg" /></imageMetad class StoreImage(rend.Page): addSlash=True """ Gets a file and a set of metadata fields. POST with the image in the field image and a metadata dictionary of name => value pairs. """ def __init__(self, config): self.config = config def locateChild(self, ctx, segments): # removed som internal processing here to make the example smaller. self.metadata = {'id': "pokpokpokpo/oijoioij" } # dummy data self.xmlFileName = "/somefile.xml" return self, () def renderHTTP(self, ctx): metadata = self.metadata request = inevow.IRequest(ctx) request.setHeader('Content-Type', 'text/xml; charset=UTF-8') request.setHeader('X-objectId', metadata['id'] ) #request.setResponseCode("303") # 303 request.redirect( "/info/" + metadata['id'] ) #request.finish() # I have also tried to return "" but with the same results. return static.File(self.xmlFileName, 'text/xml') I have tried various ways to get this working. I've tried to call request.finish(), but then the process bombs out. Any tips to what I should do to get this working would be very welcome. Kind regards, Tarjei -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFIW4pfYVRKCnSvzfIRArmOAJ9rR94r2taNbFav18FJGPy70iwAvwCfX0v8 FbEX7pBHtvpXJ9qtySEveCc= =L6YP -----END PGP SIGNATURE-----

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Does twisted.web2 have similar twisted.web.server.NOT_DONE_YET usage?
by echo 21 Jun '08

21 Jun '08

hello, everybody: I have a request and the response need similar twisted.web.server.NOT_DONE_YET function. does twisted.web2 have similar twisted.web.server.NOT_DONE_YET usage? thanks.

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Python 2.3 support in Nevow
by Jean-Paul Calderone 19 Jun '08

19 Jun '08

Glyph and I had a discussion about Nevow on Python 2.3 yesterday. We ended up wondering who is using Nevow with Python 2.3 and who would notice or care if Python 2.4 became the minimum requirement. So, if you're using Nevow, what version of Python are you using it with? Jean-Paul

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requestHeaders issues
by Phil Christensen 05 Jun '08

05 Jun '08

Hi all, I've run into a problem in Twisted.Web with a recent addition to SVN head. The problem occurs in my WSGI gateway module, which is derived from web2's version. When I'm creating the environment dictionary by iterating like this: # Propagate HTTP headers for title in request.received_headers: header = request.received_headers[title] ... ... the iteration through received_headers causes the following exception: Traceback (most recent call last): File "/Users/phil/Workspace/modu/modu/web/wsgi.py", line 91, in createCGIEnvironment for title in request.received_headers: File "/Users/phil/Workspace/Twisted/twisted/web/ http_headers.py", line 41, in __getitem__ if self._headers.hasHeader(key): File "/Users/phil/Workspace/Twisted/twisted/web/ http_headers.py", line 247, in hasHeader return name.lower() in self._rawHeaders exceptions.AttributeError: 'int' object has no attribute 'lower' After some searching, I found this patch: r23826 | exarkun | 2008-06-02 11:06:06 -0400 (Mon, 02 Jun 2008) | 15 lines Merge web-headers-165-2 Author: dreid, exarkun Reviewer: therve Fixes: #165 Add two new attributes to twisted.web.http.Request, `requestHeaders` and `responseHeaders`, which parallel the previous attributes `received_headers` and `headers`. The new attributes are preferred and provide a structured interface to accessing and manipulating header information, including multiples values per header which was unsupported by the previous API. `received_headers` and `headers` are not deprecated and coding using them will continue to work, but their use is discouraged and they will be deprecated at some future time. If I make those changes and use `requestHeaders` instead, like this: # Propagate HTTP headers for title in request.received_headers: header = request.received_headers[title] ... ... I instead get the following traceback: Traceback (most recent call last): File "/Users/phil/Workspace/modu/modu/web/wsgi.py", line 91, in createCGIEnvironment for title in request.requestHeaders: exceptions.TypeError: 'Headers' object is not iterable which seems strange to me, since from what I can tell, request.requestHeaders should be a http_headers._DictHeaders instance. Should I be calling request.requestHeaders.getAllRawHeaders() and iterate through that result instead? Any guidance in this matter would be greatly appreciated. Thanks again, -phil

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Connecting to external JavaScript libs with Athena
by Travis Branham 02 Jun '08

02 Jun '08

Hi all, So, I've been racking my brain for a couple of days on this, and I can't seem to get anywhere. My question is: Is it possible to connect to an external JavaScript library, and subsequently make calls to said library through an Athena LivePage element? Just to let you know where this is going, I had planned on embedding a map in my web application, using the Google Maps API. The problem, as I'm sure you can guess, is that the JavaScript for GM is loaded directly from their servers through the Google AJAX API. Now, I know their Ajax API does create a unique namespace for the function calls (eg: google.maps.Map2, etc.), but, so far, I have been unable to get a method from a LivePage or LiveElement to be able to talk with the Google API. Just to be clear, I have no problem simply importing the GM API and displaying the map -- my problem is that I want to add markers to the map, based on some server-side events. Effectively, I will have little to no client -> server communication during a normal visit (except, of course, the user's interaction with the map, which happens on Google's end anyway). When I tried to figure out how to do this in the first place, I tried modifying the "Athena LiveElement Tutorial" by embedding the JavaScript call (a simple "echo" function) directly into the HTML source (instead of using the jsClass attribute in LiveElement); from there, I tried a number of ways to get the LiveElement to "talk" to the embedded JS. No dice. Perhaps I'm missing something, or perhaps what I'm trying to do is just not supported. I'd supply some code here, but I really don't know if that would be very useful; let me know, however, if you feel otherwise. Anyway, any insight will be helpful. Thanks a lot, Travis

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