Mailman 3 August 2011 - Twisted-web

Test
by Philippe Lafoucrière 05 Aug '21

05 Aug '21

Hi all just a test

3 2

Porting the features of nevow.guard to twisted.web.guard
by L. Daniel Burr 05 Jan '12

05 Jan '12

Hi gang, Per a short chat with exarkun (thanks exarkun), I'm posting this to the list for discussion. A project upon which I am working requires a twisted.web service that allows a user to delegate authentication/authorization to a third party, e.g., Facebook, Twitter, et cetera. In so doing, I've found myself missing nevow.guard, since web.guard currently only has out-of-the-box support for HTTP Auth. I'd like to see web.guard expand to cover more kinds of auth, such as form-based auth or the OAuth-based solutions coming from so many social graph sites. With this in mind, I asked exarkun about this, and he mentioned that the only thing he does not consider to be garbage in nevow.guard is the feature-set, and that I should port the features to web, discarding the baggage. I'd like to solicit the list for some guidance as to what those features are, or should be, and hopefully end up with a ticket describing the features to be implemented, which I will then attempt to implement and contribute to twisted.web. Thanks, Daniel -- L. Daniel Burr ldanielburr(a)mac.com (312) 656-8387

5 5

CorePost - a tiny Flask-style REST microframework for twisted.web
by Jacek Furmankiewicz 06 Sep '11

06 Sep '11

Hi, I'd like to announce the very first alpha release of CorePost, a tiny REST microframework on top of the core twisted.web APIs. http://pypi.python.org/pypi/CorePost/0.0.1 it's design is heavily inspired by Flask, for easy creation of REST services. Looking forward to any comments and suggestions. It's my first attempt at any serious Twisted programming, so be gentle with your comments :-) Cheers, Jacek P.S. I plan to look at integrating twisted.internet.processes http://pypi.python.org/pypi/twisted.internet.processes in the near future to enable scaling to all cores on a multi core machine. using its deferToProcess() functionality. Any suggestions from seasoned Twisted developers on whether that is the correct approach would be appreciated.

5 16

default file creation when using reactor.spawnProcess
by Stephan 29 Aug '11

29 Aug '11

I'm attempting to move over PERL code to python code using the twisted framework. so far a few hiccups but this mailing list has helped me quite figure it out. I have a few few more hurdles, one being that since moving from Perl's my $cmd = "xvfb-run --auto-servernum firefox -P $profile_id"; $pid = open2($infh, $outfh, $cmd); to twisted's reactor.spawnProcess: subprocess = reactor.spawnProcess(self.pp, args[0], args, env = os.environ, usePTY=1, childFDs=None) when the xvfb/firefox processes create files they do so with root read/write, owner no permissions and group no permissions, using the the perl implementation the twisted daemon is run as a particular user and the file creation via firefox is rw rw rw which is what my goal is. What code would help those on the list willing to help? the daemon script code in init.d? Thanks in advance, so far this list has been golden! Stephan

2 5

http authentication for xmlrpc: basic works, digest unauthorized
by Steven Samuel Cole 29 Aug '11

29 Aug '11

hello, i would like to create an xmlrpc interface to my data server. i've been trying to get my head around twisted for that purpose for about a week now and i think i've made ok progress: anonymous xmlrpc (i.e. without user authentication) works over tcp and ssl and in order to understand http authentication in twisted, i've set up web server (also over tcp and ssl) which does log in users by means of basic and digest http authentication. concerning xmlrpc and users, _basic_ http authentication does work, but when i try to use _digest_ authentication, i keep getting 401 unauthorized. the test client i am using is pretty much the same as the sample code from http://twistedmatrix.com/documents/current/web/examples/xmlrpcclient.py i am working on mac osx with the twisted 8.2 as installed by default. i do assume that changing basic to digest in the server does not require any changes in the client. is that assumption correct ? is it a known problem that basic auth works but digest does not ? does anyone have authenticated xmlrpc access running ? what would be the most straight forward way to find the reason why auth fails ? thank you very much, ssc

1 0

Rendering of list/table data with a template
by Florian Lindner 23 Aug '11

23 Aug '11

Hello, I'm still trying to figure out what is the correct way to render data in a template that comes from a list, e.g. to produce a table. I have figured out a way, but I got no idea if that's the way to go: <table> <tr t:render="table_row"><td><t:slot name="table_content" /></td></tr> </table> with that renderer: @renderer def table_row(self, request, tag): rows = ["A", "B", "C"] output_list = [] for row in rows: t = tag.clone() t.fillSlots(table_content=row) output_list.append(t) return output_list Is that how it should be done in twisted templating? Thanks, Florian

2 1

spawning a xvfb and firefox with a timeout
by Stephan 22 Aug '11

22 Aug '11

I'm attempting to spawn xvfb with firefox using twisted's spawnProcess. I'm having two issues: 1) when I call a normal process (not xvfb) it seems to work, but when I call xvfb the process goes defunct 2) perhaps because it goes defunct but the timeout I set in place in the processprotocol does not trigger. ============== here is the code for spawning a process ============== 108 command = ["/usr/bin/xvfb-run", "--auto-servernum", "/usr/bin/firefox", "-P", profile_id] 109 subprocess = reactor.spawnProcess(TimedProcessProtocol(20), 110 command[0], command) 111 logging.debug(type(subprocess)) 112 logging.debug("spawned a process: pid: %d", subprocess.pid) 113 114 # this file will be created when firefox starts 115 while (not os.path.exists(self.profile_dir + "/importantfile")): 116 logging.debug("in while loop waiting for firesharkReady file to exist") 117 pass 118 119 logging.debug("file exist") ============== here is the process class ============== 27 class TimedProcessProtocol(protocol.ProcessProtocol): 28 29 def __init__(self, timeout): 30 self.timeout = timeout 31 32 def connectionMade(self): 33 logging.debug("connection made timeout = %d", self.timeout) 34 @defer.inlineCallbacks 35 def killIfAlive(): 36 logging.debug("timeout reached - killing process") 37 try: 38 yield self.transport.signalProcess('KILL') 39 except error.ProcessExitedAlready: 40 logging.debug("process already exited") 41 pass 42 43 d = reactor.callLater(self.timeout, killIfAlive) 44 45 def outReceived(self, data): 46 logging.debug("output: %s", data) 47 48 def errReceived(self, data): 49 logging.debug("errReceived %s", data)

3 10

How to use templating with the web server
by Florian Lindner 22 Aug '11

22 Aug '11

Hello, I want to build a simple webinterface for my application and decided to use twisted.web with its templating for that. This will be my first contact with twisted. I had found a working example at [1]. Is there a way to render a template that involves less boiler plate code? In that example I had to create a template.Element class and a web.Ressource class for each page I want to render. The Ressource basically looks always the same for each page, just that it renders another Element class. Is there a way to shortcut that a bit? My standard situation will be that I have a template file and an Element class containing the logic. These are "mounted" somewehre in the hierarchy (like with putChild). Sorry, I'm sure I'm lacking quite a bit of insight into twisted. Thanks! Florian [1] http://groups.google.com/group/pythonmy/browse_thread/thread/bab31751d0e0f7…

2 1

How to disable messages in client.getPage ?
by Ivan 10 Aug '11

10 Aug '11

How to disable messages in client.getPage: 2011-08-10 19:57:38+0400 [HTTPPageDownloader,client] Starting factory <HTTPDownloader .... document.write('

1 0

Implementing a continuous polling client in twisted
by Daniel Gonzalez 08 Aug '11

08 Aug '11

Hello, I am trying to implement a continuous polling client for couchdb change notifications, which uses HTTP protocol (REST): http://guide.couchdb.org/draft/notifications.html I have started by using the agent described here: http://twistedmatrix.com/documents/current/web/howto/client.html This is working fine, but the problem is that the connection is not permanent: it is being closed after a timeout (I think 1 minute). For continuous polling, I need to keep the connection open (forever), or if that is not possible, to reconnect as soon as the connection is closed. I have taken a look at the code, and the problem seems to be that the Agent (twisted/web/client.py) class is using ClientCreator (twisted/internet/protocol.py) ClientCreator is not doing reconnection. I would like to implement a similar class to ClientCreator, but one which uses ReconnectingClientFactory (twisted/internet/protocol.py) I have not found any guidance in using ReconnectingClientFactory. According to the documentation: "Note that clients should call my resetDelay method after they have connected successfully." The difficulty I have is that the factory is not returning any deferred which I could use to catch when connections are established, and then call the resetDelay method. Do you have any pointers to examples of use of ReconnectingClientFactory? BR, Daniel Gonzalez

1 0