Mailman 3 October 2004 - Twisted-web

Test
by Philippe Lafoucrière 05 Aug '21

05 Aug '21

Hi all just a test

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How to get rid of web logs?
by Yun Mao 06 Jan '05

06 Jan '05

Right now I'm using the log for debugging, and I don't wan to log those info like below. How should I achieve this? Thanks! 2004/09/30 13:31 Eastern Daylight Time [HTTPChannel,1,127.0.0.1] 127.0.0.1 - - [ 30/Sep/2004:17:31:56 +0000] "GET /?view=all HTTP/1.1" 200 2767 "http://localhost :1083/" "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7) Gecko/20040803 Firefox/0.9.3" Yun

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Nevow: Authenticated site with "remember me" and vhosts
by Paul Moore 04 Nov '04

04 Nov '04

I'm trying to use Nevow to build a site which displays the results of a series of SQL queries. It looks good so far, I have the basic site structure all sorted out in my mind (it's *very* impressive how quick that was in Nevow). Before I flesh things out much further, I want to add some authentication - basically, "guest" users will be able to see a limited subset of the data. Adding authentication including a "login" form in the sidebar (a bit like Roundup does) was again very easy. I basically cribbed from the existing examples. But there are a few things I's now like to add: 1. Ultimately, I want to proxy the app through Apache, so I was using the Virtual Host Monster. Im ny original, unauthenticated, application, I added a "vhost" child to the main application resource, and that was it. I can no longer do that, as the resource is wrapped in a guard.SessionWrapper, which doesn't have a putChild method. I'm not clear that I want the vhost child to be authenticated anyway - what I *think* I want is for "/" to be authenticated, but "/vhost" not to be. Or do I? Any suggestions? 2. I'd like to add a "remember me" checkbox, which if checked sets a cookie to remember the user's ID, so that they don't have to log in again for (say) 2 weeks. Much like gmail, or Yahoo, do. But I'm not too sure how I'd go about this. I'm not even sure where I'd *put* auto-login code: the page is too late (the guard has done its thing by then) but anything else seems to be too early (ie, not per-session, if you see what I mean). I suspect I need to subclass the Portal, or something, but I'm not sure... I've scanned the various examples, both in the distribution and in the Nevow sandbox, but nothing seems to do what I want. Can anyone give me some pointers? <off on a tangent> This is the sort of area where the lack of documentation really hurts. Examples are great (and the wealth of Nevow examples is realy nice) but there's a lack of "general principle" documentation to make it easy to generalise the example code. My best example of this is that I can't work out what to return from a render_* method - should it be a function, or a string, or a stan tree, or what? I suspect that by the magic of interfaces, the answer is "anything that can be adapted to an ISomething" (which needs further documentation to say what standard adapters from string, sequence, whatever to ISomething exist) - but it's not stated anywhere, which makes writing render_* methods an exciting exercise in experimentation :-) At the other end of the scale, the source is really too low-level to follow for this sort of thing (I have tried). Is there any documentation effort for Nevow going on anywhere? I'd happily contribute, although it would more likely be in the form of questions than answers at the moment :-) </off on a tangent> FWIW, I attach my driver script below, in case it clarifies my authentication question above. from twisted.application import internet from twisted.application import service from twisted.web import static from nevow import appserver from nevow import vhost from nevow import guard from nevow import inevow from twisted.cred import portal from twisted.cred import checkers from twisted.cred import credentials from testapp.web import pages # Authorisation setup. # First we need a realm, which provides requestAvatar # TODO: need NotLoggedIn, LoggedIn and noLogout class MyRealm: """A simple implementor of cred's IRealm. For web, this gives us the LoggedIn page. """ __implements__ = portal.IRealm def requestAvatar(self, avatarId, mind, *interfaces): for iface in interfaces: if iface is inevow.IResource: # do web stuff if avatarId is checkers.ANONYMOUS: resc = pages.BasePage() else: resc = pages.BasePage(avatarId) resc.realm = self return (inevow.IResource, resc, resc.logout) raise NotImplementedError("Can't support that interface.") # Now create a portal to our realm realm = MyRealm() portal = portal.Portal(realm) # Create a checker for a static list of test users myChecker = checkers.InMemoryUsernamePasswordDatabaseDontUse() myChecker.addUser("user","password") myChecker.addUser("fred", "flintstone") # Register our checker, and an anonymous user checker, with the portal portal.registerChecker(checkers.AllowAnonymousAccess(), credentials.IAnonymous) portal.registerChecker(myChecker) application = service.Application('testapp') # Instead of the application resource being the base page, it becomes a # SessionWrapper round the portal we created. The base page is part of the # realm - see above... # appResource = pages.BasePage() appResource = guard.SessionWrapper(portal) #appResource.putChild('robots.txt', static.File('static/robots.txt')) # SessionWrapper doesn't have a putChild method... #vResource = vhost.VHostMonsterResource() #appResource.putChild('vhost', vResource) webServer = internet.TCPServer(8080, appserver.NevowSite(appResource)) webServer.setServiceParent(application) # vim:ft=python: Paul -- The scientific name for an animal that doesn't either run from or fight its enemies is lunch. -- Michael Friedman

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Twisted as reverse proxy for access control?
by Bud P. Bruegger 29 Oct '04

29 Oct '04

Hello, I'm new to Twisted and would like to find out whether it is a good choice to solve my problem. For OpenPortalGuard's GateKeeper component (http://openportalguard.sourceforge.net/wiki/index.php/Specification/Archite…), I am looking for a platform to implement a reverse proxy that handles the following tasks before giving access to a private network that hosts multiple application servers: * ssl processing (offloaded from application servers) * ssl client cert authentication * a custom authentication module that writes cookies * a custom access control module (role based) * an URL-rewriting engine like Apache's mod-proxy or mod-rewrite My first idea was to use Apache with mod-ssl, mod-proxy, and mod-rewrite out of the box and write the two custom modules with mod-python. My concern with Apache is scalability. I believe that Twisted (implementing the Reactor Pattern) should be able to handle many more concurrent connections. Can anybody confirm this and possibly quantify this with examples? My concern with Twisted is (due to ignorance ;-) whether it has the out of the box functionality equivalent to Apache's mod-ssl and mod-rewrite (to proxy to remote hosts). A first look seems to indicate that twisted.internet.ssl, twisted.web.proxy, and twisted.web.rewrite are my friends. Is this correct? Are there any examples out there? Any experience on performance? Alltogether, is Twisted a good choice for my plan? Has anyone already used Twisted for such a purpose? Many thanks in advance for any input and suggestions. -b ------------------------------------------------------------------------------------------------- Ing. Bud P. Bruegger, Ph.D. 0564-488 577 (voice) Servizio Elaborazione Dati 0564- 21139 (fax) Comune di Grosseto e-mail: bud(a)comune.grosseto.it Via Ginori, 43 jabber: bud(a)amessage.info 58100 Grosseto icq: 249-858-685 Collaborazione Open Source per la CIE e CNS http://www.comune.grosseto.it/cie/ Software Libero/Open Source in P.A.: Non solo una buona idea, ma una necessita'

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How to use Woven.form
by Young-gue Park 28 Oct '04

28 Oct '04

i want to use Woven.form but i don't know exact using If I use Woven.form, I will really easy make form and process form data please help me Any example code and any hint make me so happy ps... why don't you complete form in depth document? and When was document completed?

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Nevow bug?
by Peter Hunt 28 Oct '04

28 Oct '04

nevow.stan.Comment.__call__ has the following line: return NotImplementedError('comments are not callable') Shouldn't it be: raise NotImplementedError('comments are not callable') This was a tough bug to track down.

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Redirect with deferred
by Vicky Lupien 27 Oct '04

27 Oct '04

Hi, I have a little problem. I have a deferred and I want to redirect after the defered is done. But it seems that my page is rendered and my redirect is never done. Can someone help me. Here's my code: class HousesQuickSearch(pagelib.QuebecPage, sqlQueries): def render_content(self, context, data): request = context.locate(inevow.IRequest) def _(data): print data ses = request.getSession() self.houseSR = sessions.ISessionPrefs(ses).get('houseSR') sessions.ISessionPrefs(ses).set(self.houseSR[0], data) sessions.ISessionPrefs(ses).set(self.houseSR[4], 0) lengthPage = sessions.ISessionPrefs(ses).get(self.houseSR[2]) widthPage = sessions.ISessionPrefs(ses).get(self.houseSR[3]) currentPage, pageBatchItems = self.nextPage(data, lengthPage, widthPage, 0) sessions.ISessionPrefs(ses).set(self.houseSR[4], currentPage) sessions.ISessionPrefs(ses).set(self.houseSR[1], pageBatchItems) dir = '/'.join(['', '/'.join(request.prepath[0:-1]), "search", "results"]) #this is not done return request.redirect(dir) conditions = " where 1" if request.args.get('plan_number')[0]: conditions += " and plan_number='"+str(request.args.get('plan_number')[0])+"'" sql = self.getHouseSearchResultsInfo(conditions) dbpool = request.getSession().guard.resource.portal.realm.dbpool searchResults = dbpool.runQueryDict(sql) searchResults.addCallback(_) Vicky

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Re: Case for an Async MySQL Driver?
by Peter Hunt 27 Oct '04

27 Oct '04

I'd be willing to help; but I think we should shell out an async DB-API, too. Maybe go over to DB-SIG and propose an async version of the new upcoming spec?

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Diagnosing a socket leak in nevow code
by Joseph Bowers 26 Oct '04

26 Oct '04

Hey, all! I'm working with a release nevow (0.1) on Twisted 1.3, and somewhere I've introduced a socket leak. Unfortunately, I'm not sure how to go about debugging this: Does anybody have recommendations for tracking down this kind of error? What are common screw-ups with nevow code that might lead to zombie sockets? Thanks! -------------------- Joe Bowers Technical Director Seventy-two dpi 828.252.2408 [x308] joe(a)seventytwodpi.com http://www.seventytwodpi.com

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HTTP/1.1 Persistent Connections and Pipelining
by Seun Osewa 26 Oct '04

26 Oct '04

Hi, Does Twisted.Web support persistent connections and pipelining? how can I take advantage of this, if it does? And, if not, do you feel the interface is such that support for persistent connections can be transparently added? Regards, Seun Osewa.

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