Twisted-web December 2007

twisted-web@python.org

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Test
by Philippe Lafoucrière 05 Aug '21

05 Aug '21

Hi all just a test

3 2

renderer returning an errored deferred makes the response hang
by Drew Perttula 20 Dec '07

20 Dec '07

This page prints an error to the console, but the page never terminates. Rendering 'bar' behaves how I would expect-- an error page is shown in the browser. How can I cause error pages to display when any renderer errors (or even replace that renderer with a local error message)? Having my site hang is awkward for debugging. import sys from twisted.internet.defer import Deferred from twisted.internet import reactor from twisted.python import log from nevow.appserver import NevowSite from nevow import rend, loaders, tags as T import nevow class P(rend.Page): docFactory = loaders.stan(T.body[T.directive('foo')]) def render_foo(self, ctx, data): d = Deferred() def e(result): raise ValueError d.addCallback(e) d.callback(5) return d def render_bar(self, ctx, data): raise ValueError print nevow.__file__, nevow.__version__ log.startLogging(sys.stdout) reactor.listenTCP(8006, NevowSite(P())) reactor.run()

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REST and DELETE
by Gary Jefferson 19 Dec '07

19 Dec '07

I notice that twisted.web.resource supports GET, PUT, and POST (via render_ methods), but not DELETE. Is this intentional, or are there some plans to add support for those of us who want to do full-fledged REST with twisted-web? I haven't looked at figuring out httpclient support for the same in twisted yet, but I'm assuming that sending DELETE/PUT is similar to sending POST, i.e., use putrequest() with 'DELETE'? Gary ____________________________________________________________________________________ Never miss a thing. Make Yahoo your home page. http://www.yahoo.com/r/hs

4 6

nevow athena version 9.0 vs later
by Михаил Михайлов 09 Dec '07

09 Dec '07

Hi my example consists 2 files: aacc_web.py and aacc_web.js python aacc_web.py will start on port 8080 generated html contains textarea and in case of input prints the entered symbol on the console and in textarea It works ONLY in version 9.0 and does NOT (!) work in last versions Explain what's wrong ---------------------------------------------------------------------------------------------------------------------------------- aacc_web.js //import Nevow.Athena function keypress(event) { var key = event.charCode ? event.charCode : event.keyCode var node = $("termid"); Nevow.Athena.Widget.get(node).callRemote("aacc_keypress", event.charCode, event.keyCode, event.metaKey, event.altKey, event.ctrlKey, event.shiftKey); } AaccWeb.Users = Nevow.Athena.Widget.subclass("AaccWeb.Users"); AaccWeb.Users.methods( function start(self, node, event) { self.callRemote("aacc_start"); return false; }, function showConference(self, toWhat) { var client_data = Nevow.Athena.NodeByAttribute(self.node, "class", "Users"); client_data.innerHTML = toWhat; } ); ---------------------------------------------------------------------------------------------------------------------------------- aacc_web.py code # -*- coding: utf-8 -*- """ aacc_web """ from twisted.application import service, internet from twisted.internet import reactor, protocol, defer, task, ssl from twisted.protocols import basic from twisted.python import log, logfile, util from twisted.cred import portal, checkers, credentials from twisted.web import static from nevow import appserver from nevow import tags, guard from nevow import rend, loaders, inevow, athena from nevow import url from nevow.inevow import IRequest import os, logging, pprint, time, sys class Users(athena.LiveFragment): jsClass = u" AaccWeb.Users" docFactory = loaders.xmlstr(""" <div xmlns:nevow="http://nevow.com/ns/nevow/0.1" xmlns:athena=" http://divmod.org/ns/athena/0.7" nevow:render="liveFragment" class="Users"> </div> """) running = False def __init__(self, **kwargs): print 'start Users AJAX session' def aacc_start(self): if self.running: return reactor.callLater(1, self.updateConference, True) self.running = True athena.expose(aacc_start) def aacc_keypress(self, charcode, keycode, metakey, altkey, ctrlkey, shiftkey): print 'charcode: %s keycode: %s metakey: %s altkey: %s ctrlkey: %s shiftkey: %s' % (charcode, keycode, metakey, altkey, ctrlkey, shiftkey) self.updateConference(True, unichr(charcode)) athena.expose(aacc_keypress) def updateConference(self, force=False, sym=''): """ updateConference """ #print 'updateConference' def onUpdateConferenceOk(result): self.callUpdateConference = reactor.callLater(1, self.updateConference) def onUpdateConferenceErr(err): self.running = False if not force: self.callUpdateConference = reactor.callLater(1, self.updateConference) return mystr = u"""<textarea id="termid" cols="10" rows="5" onkeypress="return keypress(event)">""" + sym + u"""</textarea>""" #self.callRemote('setFocus') df = self.callRemote('showConference', mystr) df.addCallbacks(onUpdateConferenceOk, onUpdateConferenceErr) class ConferencePage(athena.LivePage ): docFactory = loaders.xmlstr(""" <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd "> <html xmlns:nevow="http://nevow.com/ns/nevow/0.1"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <nevow:invisible nevow:render="liveglue"/> <script type="text/javascript" src="aacc_web.js"> </script> </head> <body> <div nevow:render="conference"> </div> </body> </html> """) def __init__(self, *a, **kw): super(ConferencePage, self).__init__(*a, **kw) self.jsModules.mapping[u'AaccWeb'] = util.sibpath(__file__, 'aacc_web.js') addSlash = True def render_liveglue(self, ctx, data): req = ctx.locate(IRequest) args = dict([(k,v[0]) for (k,v) in req.args.items()]) self.args = args return athena.LivePage.render_liveglue(self, ctx, data) def render_conference(self, ctx, data): args = dict([(k,v) for (k,v) in self.args.items ()]) c = Users(**args) c.page = self reactor.callLater(0, c.aacc_start) return ctx.tag[c] class RootPage(rend.Page): """ """ addSlash = True docFactory = loaders.xmlstr(""" <html xmlns:nevow="http://nevow.com/ns/nevow/0.1"> <body> </body> </html> """) def renderHTTP(self, ctx): print 'render of root page' req = ctx.locate(IRequest) my_url = url.here.child('conference') return my_url def child_conference(self, ctx): return ConferencePage() class aacc_web: """ """ def __init__(self, **kwargs): """ """ resource = RootPage() site = appserver.NevowSite(resource) reactor.listenTCP(8080, site) if __name__ == "__main__": aacc_web = aacc_web() reactor.run() ---------------------------------------------------------------------------------------------------------------------------------- Mike

2 4

HTTP POST from SMTP server
by James Brady 08 Dec '07

08 Dec '07

Hi all, I'm a complete Twisted newcomer, so still getting to grips with the ways thing work.. What I'm trying to do is submit a POST request when I receive email into my SMTP server. At the moment, I've basically modified emailserver.tac from the examples ( http://twistedmatrix.com/projects/mail/documentation/examples/emailserver.t… ) My eomReceived message has this code added to it: ... client = getPage(url='http://localhost:8080/message_event_notify', method='POST', postdata=urlencode(postdata), headers={ 'Content-Type': 'application/x-www-form-urlencoded' } ) client.addCallback(self.success) client.addErrback(self.failure) reactor.run() ... The POST request is received and processed as expected, and the success method is invoked, but then the server stacktraces and halts, while the SMTP sender client never completes. The server stacktrace: 2007/12/08 23:50 +0100 [SMTP,0,127.0.0.1] (Port 2500 Closed) 2007/12/08 23:50 +0100 [SMTP,0,127.0.0.1] Stopping factory <__builtin__.Smtp2HttpFactory instance at 0x13a4e68> 2007/12/08 23:50 +0100 [HTTPPageGetter,client] Stopping factory <HTTPClientFactory: http://localhost:8080/message_event_notify> 2007/12/08 23:50 +0100 [SMTP,0,127.0.0.1] Main loop terminated. 2007/12/08 23:50 +0100 [SMTP,0,127.0.0.1] Unhandled Error Traceback (most recent call last): File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/twisted/application/app.py", line 113, in runReactorWithLogging reactor.run() File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/twisted/internet/posixbase.py", line 220, in run self.mainLoop() File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/twisted/internet/posixbase.py", line 231, in mainLoop self.doIteration(t) File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/twisted/internet/selectreactor.py", line 133, in doSelect _logrun(selectable, _drdw, selectable, method, dict) --- <exception caught here> --- File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/twisted/python/log.py", line 48, in callWithLogger return callWithContext({"system": lp}, func, *args, **kw) File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/twisted/python/log.py", line 33, in callWithContext return context.call({ILogContext: newCtx}, func, *args, **kw) File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/twisted/python/context.py", line 59, in callWithContext return self.currentContext().callWithContext(ctx, func, *args, **kw) File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/twisted/python/context.py", line 37, in callWithContext return func(*args,**kw) File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/twisted/internet/selectreactor.py", line 149, in _doReadOrWrite self._disconnectSelectable(selectable, why, method=="doRead") File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/twisted/internet/posixbase.py", line 258, in _disconnectSelectable selectable.connectionLost(failure.Failure(why)) File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/twisted/internet/tcp.py", line 411, in connectionLost self._closeSocket() File "/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/site-packages/twisted/internet/tcp.py", line 100, in _closeSocket skt = self.socket exceptions.AttributeError: 'Server' object has no attribute 'socket' 2007/12/08 23:50 +0100 [-] Main loop terminated. 2007/12/08 23:50 +0100 [-] Server Shut Down. Does anyone have any suggestions? Thanks, James

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Twisted-web December 2007