Twisted-web November 2012

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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Re: [Twisted-web] [Twisted-Python] Speed of rendering?
by Glyph 28 Feb '13

28 Feb '13

On Jun 22, 2012, at 2:52 PM, Peter Westlake <peter.westlake(a)pobox.com> wrote: > On Thu, Jun 21, 2012, at 10:16, Glyph wrote: >> >> Le Jun 21, 2012 à 6:52 AM, Peter Westlake <peter.westlake(a)pobox.com> a >> écrit : >> >>> How fast is rendering in nevow? I have a page which is mostly a large >>> table with a couple of hundred rows, each containing a form. The >>> generated HTML is about 500 KB. Leaving aside the question of whether >>> this is a good design or not, how long would you expect it to take? I'm >>> interested specifically in what happens between the end of beforeRender >>> and the request being completed. It takes about a minute and a quarter. >>> Is that normal, or is there a delay in my code that I haven't found yet? >>> >>> Thanks, >>> >>> Peter. >> >> What does your profiler tell you? > > There's a profiler? There's a profiler! There it is, > right up there at the top of the man page! Thank you! Not only is there a profiler, there's benchmarks! <http://speed.twistedmatrix.com/timeline/> Maybe you could add one for twisted.web.template rendering speed? > Peter. > > P.S. sorry, this was really meant to go to the twisted-web list. > I suspect a last-minute substitution by my email client. Thanks for the thought, at least. Cross-posted. -glyph

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twisted web and css files
by John Aherne 26 Nov '12

26 Nov '12

I seem to have a problem processing css files with twisted.web using twisted templates. I get a message in my Firefox error console saying that it could not load the css file since the type was text/html not text/css I am running on windows 7 32bit python 2.7.3 twisted 12.2.0 twisted templates The template renders fine but without the styling. I have hunted around for some ideas as to what the problem is but most seem to be that people have not added the static file location to root. In theory I do not have that problem since the message says it has found the file but will not process it since it has the wrong type. In my template file I add the link for the css file and give it the correct file type. But I assume I have overlooked something since it refuses to process the css. My template is based on one of the demo templates and I have really just added the css link <html xmlns:t="http://twistedmatrix.com/ns/twisted.web.template/0.1"> <head> <title> Add Admin User </title> <link href="styles/jahstyle.css" rel="stylesheet" type="text/css" /> </head> <body> <div t:render="header" /> <ul> <li t:render="widgets"> <t:slot name="widgetName"/> </li> </ul> <div t:render="footer" /> </body> </html> The python that is processing this file is based on the samples I found with some additions to add the staic file for the css from twisted.web.server import Site, NOT_DONE_YET from twisted.web.resource import Resource from twisted.internet import reactor from twisted.web import server, static from twisted.web.template import Element, renderer, XMLFile, flattenString from twisted.python.filepath import FilePath class WidgetsElement(Element): loader = XMLFile(FilePath('iteration-1.xml')) widgetData = ['gadget', 'contraption', 'gizmo', 'doohickey'] @renderer def widgets(self, request, tag): for widget in self.widgetData: yield tag.clone().fillSlots(widgetName=widget) @renderer def header(self, request, tag): return tag('Header.') @renderer def footer(self, request, tag): return tag('Footer.') def printResult(result): print result class Root(Resource): isLeaf = True def render_GET(self, request): request.write("<!DOCTYPE html>\n") #flattenString(request, Hello()).addCallback(request.write) flattenString(None, WidgetsElement()).addCallback(request.write) request.finish() return NOT_DONE_YET root = Root() root.putChild('styles', static.File("styles")) site = Site(root) reactor.listenTCP(8080, site) reactor.run() So if anyone has some clues as to what I should look for next that would be very welcome. Regards John Aherne -- *John Aherne* * * * * * * *www.rocs.co.uk * 020 7223 7567

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twisted web and css files
by John Aherne 26 Nov '12

26 Nov '12

As an additional test I took the simple demo from twisted web in 60 seconds and checked that out. from twisted.web.server import Site from twisted.web.static import File from twisted.internet import reactor resource = File('/tmp') resource.indexNames = ['adminuser.html'] factory = Site(resource) reactor.listenTCP(8888, factory) reactor.run() The adminuser.html has the same sort of link to get the css and in this case all renders successfully. But here the whole site is set up as static so I can see why that might have worked. For anyone really interested below is the css as well. body { padding-left: 11em; color: black; background-color: #ff0000 } h1 { color: orange; } ul.navbar { list-style-type: none; padding: 0; margin: 0; position: absolute; top: 2em; left: 1em; width: 7em } h1 { font-family: Helvetica, Geneva, Arial, SunSans-Regular, sans-serif } ul.navbar li { background: #ececec; margin: 0.5em 0; padding: 0.3em; border-right: 1em solid black } ul.navbar a { text-decoration: none } a:link { color: maroon } a:visited { color: blue } address { margin-top: 1em; padding-top: 1em; border-top: thin dotted } .layout1 { background-color: f2f2f2; color: red; align: center; width: 50% } .box1 { background-color: #efefef; height: 20% } -- *John Aherne* * * * * * * *www.rocs.co.uk * 020 7223 7567

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Problems with Twisted Web & non-standard file names...
by Benjamin Schollnick 18 Nov '12

18 Nov '12

Folks, I am in the process of writing, a "gallery" style web server application using twisted.... The main goal is to be able to browse, and access my image library, without having to add the files to a database, etc.... The issue I am having is with the URL processing.... Standard ASCII, and non-extended characters are working fine.... And I've tried using urllib.quote & urllib.quoteplus (along with unquote), to solve this problem.... But an URL with a dash (-) or number sign (#), or non-ASCII (eg 2012.7.1-撮影会- de die in diem) prevents it working... The DASH or number sign will generally produce a 500 internal server error, non-ascii, will allow me to transverse to the directory, but the server fails to properly decode the URL, and none of the images work..... What happens is.... Server side - The Server decodes the request string, and transverse to the directory structure in the URL. For example, http://127.0.0.1:8888/albums/Television/B5/ would transverse into the albums / Television / B5 directory.... And http://127.0.0.1:8888/albums/Television/B5/ADVDEST.JPG?slideshow=1 would show the ADVDEST.JPG that is stored in the directory... The issue I am having is that the POST request string is stopping at a single quote mark... pre - ['albums'] post - ['anime', '(C54) [RPG'] RS /albums/anime/(C54) [RPG /Volumes/DVR Storage/MMAP/gallery/sites ['albums'] POST ['anime', '(C54) [RPG'] ARGS {} The directory name is (c54) [rpg' company (toumi haruka)] wedding bell (ah my goddess) [english][saha]. Any one have any suggestions on how to solve this? As I mentioned URLlib.quote_plus / unquote_plus don't seem to make a difference.... The one idea I had, was to send the web server an index, but that would be a pain, since you would not be able to type in the directory, as a shortcut... You would only be able to transverse via the web GUI.... - Benjamin

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Peculiarity with putChild() using the root of the webserver
by Rich Brown 15 Nov '12

15 Nov '12

I have been playing with Twisted 12.2.0, and encountered this minor infelicity: 1) Files not at the root of the web server work as expected: a) putChild("foo", File("some-directory")) works as expected - URL is http://example.com/foo/ b) Navigating to the directory "bar" within "foo" gives a URL of http://example.com/foo/bar/ as expected. 2) Files at the root of the web server wind up with an extra "/" in the URL: a) putChild("", File("some-directory")) yields a URL of http://example.com// <-- note double slash b) navigating to the same directory "bar" gives: http://example.com//bar <-- double-slash again... Conclusion: I think it would make sense to special the case of the root directory and not output a double "//" in the URL.

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Re: [Twisted-web] Override File's DirectoryLister?
by Rich Brown 04 Nov '12

04 Nov '12

Folks, Thanks again for the answers to my earlier question about overriding the DirectoryLister class. They worked perfectly. I can tweak and style the appearance as desired. One more question: Within of the display of a directory's contents, I would like to have the ability to have a form that lets me add a file to that directory. To do this, I added a <form method="post"> to the template of the DirectoryLister with an <input type=file ...> to specify the file and created a render_POST() function within my subclass of File. But the render_POST() function doesn't seem to be called when I click Submit. I suspect that I'm misunderstanding the class hierarchy, but don't know what to change. Any advice? Many thanks! Rich Brown Hanover, NH

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Override File's DirectoryLister?
by Rich Brown 04 Nov '12

04 Nov '12

I think I've answered my own question. I think the "twisted way" is to have a separate URL and chunk of code for handling these posts. Thanks. Rich Brown Hanover, NH

1 0

Websockets
by Philippe May 01 Nov '12

01 Nov '12

Hi all, There were a lot discussions regarding Websockets few months (years?) back, before the RFC6455 was released and the hybi group defining the protocol was in pretty messy state. Now this technology is stable and coming mainstream with almost all browsers supporting it, so i think it's time to reopen the question for Twisted. There are many forks on Github from the original work of rlotun called txWebSocket. My branch may be the most advanced ( https://github.com/aprilmay/txWebSocket ). It works quite well for my purpose until now, even if it can surely be improved. It has both server and client, trial tests, basic support for extensions (eg compression and multiplexing are on the way from the hybi group) and i hope is efficient enough for most uses. There is also a project called Autobahn but it is not integrated with twisted.web (so one cannot serve standard HTTP and websockets from the same service out of the box) and was designed first to be a test suite for the development of the protocol. What are the opinions from the core team and other people in this list on this? Thanks, Philippe

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Twisted-web November 2012