Mailman 3 April 2009 - Twisted-web

Test
by Philippe Lafoucrière 05 Aug '21

05 Aug '21

Hi all just a test

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Page loading time
by Piotr Jackowski 26 Apr '09

26 Apr '09

Hi Guys, Do you have any hints how to speed up live page loading time? How to add compression or caching to xhtml and javascript files? Peter

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proxy http 204
by Brian Kuhn 25 Apr '09

25 Apr '09

I've written an http proxy using twisted. It works fine, except when proxying an HTTP 204 response. The handleStatus, handleHeader and handleEndHeaders all get called. Then the process just hangs for 10+ seconds (presumably timing out). Then handleResponseEnd gets called (never calling handleResponsePart). All of this is expected, except for the hanging part. Anyone have any ideas what's going on here? Thanks, Brian

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Session manager and twisted
by vitaly＠synapticvision.com 22 Apr '09

22 Apr '09

Hi, is there any example of session manager that plays with Twisted and usage of such manager? Appreciate any help.

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Finer-Grained Security System for Twisted Web/Nevow?
by Jeff Rush 22 Apr '09

22 Apr '09

Hi, I'm working with Twisted Web/Nevow and have questions about my options for user authentication. I've read all the docs on portal/realm/cred and have a simple website working using those (and guard.SessionWrapper) that prompts for login. However I'm not sure of the correct design approach to using that technique for a site with mixed access controls. >From reading the sources, it appears that the portal/realm/cred system only checks the user identity at the -start- of an HTTP request, prior to URL traversal or page delivery. Once the realm has returned an appropriate avatar representing a specific tree of pages/resources, there appear to be no further security controls for finer control. I see two problems with that approach: 1) It is rather monolithic; you can't grant access to this page or that one selectively, or perhaps add a security check into the URL traversal steps to control access to a hierarchy of sub-pages. Viewing the portal as the frontdoor of a site requiring authentication, it makes it tricky to have some non-authenticating pages for visitors to register or have their forgotten password mailed to them. To do those tasks, it seems necessary to create multiple portals for a single site, one for the sign-up/password-reminder set of pages, and another portal for the members-only pages. 2) Alternatively, one could dynamically generate a custom tree of pages/resources within the realm object, returning a different tree depending upon the identity/permissions of the user. This would seem to make it complicated to (a) guarantee that all visitors see the exact same URL structure and, (b) consume more time/memory with constructing duplicate page/resource trees when thousands of users may be visiting the site, with a mix of permissions. I'm thinking I'll have to write something like decorators for page resources that front-end the locateChild method (for access control over traversal), and perhaps the renderHTTP method (for access control over page delivery) with permissions checking logic. Maybe I've misread the Twisted/Nevow sources and there is already a mechanism for, it seems to me, this common use case for a membership-type of website. Considering the complexity of the cred system that gives us such great flexiblity in authentication, I don't really want to have to bypass it and write my own mechanism. Surely others have been here before me. Any advice is appreciated, -Jeff

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by Hope Rios 22 Apr '09

22 Apr '09

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pyAMF server rejecting HTTP requests (was Re: [Twisted-web] reactor.listenSSL() question)
by Jean-Paul Calderone 21 Apr '09

21 Apr '09

On Tue, 21 Apr 2009 15:04:07 -0400, vitaly(a)synapticvision.com wrote: >Those are working fine with each other on SSL together: >echoserv_ssl.py - simple SSL server >echoclient.py - simple TCP client > >but instead of twisted protocol I'd like to use pyAMF.twisted.gateway. >And the last one denies ALL the HTTP requests as 400 ... > That sounds like a question about pyAMF (not about reactor.listenSSL). I haven't ever used pyAMF, but maybe someone else on the list knows something about it, or maybe there's a pyAMF list you can ask. Jean-Paul

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reactor.listenSSL() question
by vitaly＠synapticvision.com 21 Apr '09

21 Apr '09

Hi, I'm trying to make work the following client/server, but the server always return: HTTP/1.1 400 Bad Request. The example server from Twisted.com(echoserv_ssl.py) working fine but it uses: factory = Factory() factory.protocol = echoserv.Echo Appreciate any help!!! --------- server.py --------- from twisted.internet import reactor, defer, ssl from twisted.web import server, static, resource from OpenSSL import SSL from pyamf.remoting.gateway.twisted import TwistedGateway from pyamf.remoting.gateway import expose_request class FlexInterface(): ... class ServerContextFactory: # server.key and server.crt files existing and are real certificate files. def getContext(self): ctx = SSL.Context(SSL.SSLv23_METHOD) ctx.use_certificate_file('server.crt') ctx.use_privatekey_file('server.key') return ctx if __name__ == "__main__": gateway = TwistedGateway({ "controller": FlexInterface() }, expose_request=False) root = resource.Resource() root.putChild('', gateway) reactor.listenSSL(8050, server.Site(root), ServerContextFactory()) reactor.run() --------- client.py --------- #!/usr/bin/python # Copyright (c) 2001-2004 Twisted Matrix Laboratories. # See LICENSE for details. from OpenSSL import SSL import sys from twisted.internet.protocol import ClientFactory from twisted.internet import protocol from twisted.protocols.basic import LineReceiver from twisted.internet import ssl, reactor class EchoClient(LineReceiver): end="Bye-bye!" def connectionMade(self): self.sendLine("Hello, world!") self.sendLine("What a fine day it is.") self.sendLine(self.end) def connectionLost(self, reason): print 'connection lost (protocol)' def lineReceived(self, line): print "receive:", line if line==self.end: self.transport.loseConnection() print "Connection closed" class EchoClientFactory(ClientFactory): protocol = EchoClient def clientConnectionFailed(self, connector, reason): print 'connection failed:', reason.getErrorMessage() reactor.stop() def clientConnectionLost(self, connector, reason): print 'connection lost:', reason.getErrorMessage() reactor.stop() def main(): factory = EchoClientFactory() reactor.connectSSL('localhost', 8050, factory, ssl.ClientContextFactory(), timeout=3) reactor.run() if __name__ == '__main__': main() ----- End forwarded message -----

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Re: [Twisted-web] Is there a way to implement a deferred sequence?
by Terry Jones 10 Apr '09

10 Apr '09

Hi again Alexey I guess it's clear from all the other comments that we should call what you're after something other than a Deferred. I agree with all the others that Deferreds are great as they are, and especially with the comment that you can/should use them as building blocks in the class you actually want. As for what it is that you actually want, it still sounds like something in the middle of the various things provided for you by DeferredList, the reactor itself, the code I pointed you to, LoopingCall, etc. I know it's not any of those things exactly, but it's some mixture of them. The other thing that comes to mind is defer.inlineCallbacks. You can use it to simply implement complex logic, state machines, multiple unpredictable needs and events, etc., and the caller of an inlineCallbacks decorated function gets a normal deferred back which will deliver the final result(s), if any. Using inlineCallbacks you can write fairly "natural" (i.e., synchronous-looking) code that's calling functions that return deferreds, yielding them, getting their results, and continuing as though nothing had happened. You can write state machines, you can yield DeferredLists, etc. You can do many many things, and the code you write doesn't have to look bizarre. defer._inlineCallbacks (note the underscore) takes care of interacting with your deferred yielding code and getting the results of the intermediate deferreds back to you. Note that the functionality of inlineCallbacks (and DeferredList and LoopingCall) is built upon the humble Deferred. That's pretty strong evidence that the class you'll end up writing can also offer great flexibility and generality and also be based just on Deferreds. Understanding inlineCallbacks might be another piece of the puzzle in seeing how to do what it is you need. (Apologies if you already do understand inlineCallbacks - I mention it because no-one else has and I think it's probably relevant). Terry

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Re: [Twisted-web] Is there a way to implement a deferred sequence?
by Terry Jones 10 Apr '09

10 Apr '09

>>>>> "Alexey" == twisted-web <twisted-web(a)udmvt.ru> writes: Hi Alexey Alexey> I want a sequence which is Deferred with two callbacks: one as Alexey> usual - for the whole result called at the end of the sequence, Alexey> another - called for every element of the sequence (as they Alexey> arrive). I'm pretty sure I don't understand exactly what you want. Maybe you could write it in pseudo-code, showing both how you'd call the thing you want and what the code to implement it would look like, at least conceptually. I can't promise to help, if you can be a bit more specific it might be easier to be more helpful. You might find something of worth in one of my Twisted mailing list soliloquies, which starts here: http://www.twistedmatrix.com/pipermail/twisted-python/2008-June/017904.html I have feeling that the code Esteve Fernandez and I came up with to tackle that situation might be something like what you're after. You may also like to think about whether you can use twisted.internet.task.LoopingCall It's more flexible than it may appear at first, and it also fits your pattern at least at a high-level description. Terry

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