Mailman 3 April 2005 - Twisted

[Twisted-Python] FTP / Common VFS Layer
by Michael Kerrin 22 Apr '05

22 Apr '05

Hi, I am interested in integrating Twisted's FTP server and Zope 3. I have seen the bug report http://twistedmatrix.com/bugs/issue983 and it mentions work that was done on a common VFS layer for Twisted. I am wondering if this is available anywhere has I would be very interested in seeing it. Thanks -- Michael Kerrin 55 Fitzwilliam Square, Dublin 2 Ireland Tel: 353 (0) 87 688 3894

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[Twisted-Python] Raise soap faults
by Charles Moad 20 Apr '05

20 Apr '05

I have a soap server that I am trying to make handle errors correctly. When there is an error I just return a SOAPpy.faultType instance. The client should correspondlingly raise a python exception when it gets this. Unfortunately it looks like twisted is returning the faultType instance as a valid response. Here is the returned SOAP: *** Incoming SOAP ****************************************************** <?xml version="1.0" encoding="UTF-8"?> <SOAP-ENV:Envelope SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"> <SOAP-ENV:Body> <pdbChainFileCompressedResponse SOAP-ENC:root="1"> <SOAP-ENV:Fault SOAP-ENC:root="1"> <faultcode>ArgumentError</faultcode> <faultstring>Invalid PDB Code</faultstring> </SOAP-ENV:Fault> </pdbChainFileCompressedResponse> </SOAP-ENV:Body> </SOAP-ENV:Envelope> ************************************************************************ and the python result literally is: <SOAPpy.Types.structType Fault at -1213565780>: {'faultcode': 'ArgumentError', 'faultstring': 'Invalid PDB Code'} So the soappy client is treating this as a valid return value, and not raising an exception like it should. Any ideas? Thanks, Charlie

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[Twisted-Python] API docs?
by Neil Gower 20 Apr '05

20 Apr '05

Hi folks, I'm looking forward to getting started on some development with Twisted, but ran into a little snag. I downloaded TwistedSumo-2005-03-22.tar.bz2, and was browsing through the "doc" directory and found that the "API reference" link was broken. Turns out there is no "doc/api" directory in that tarball. I also tried grabbing the source from SVN, and running "admin/epyrun", but it bailed out with: INTERNAL ERROR: Cannot create a UID for a str without a base UID. So I'm just wondering, is there a way to get the API docs for Twisted 2.0, or were they omitted from the tarball because they're broken right now? Thanks, Neil.

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[Twisted-Python] cleanup
by Joachim Boomberschloss 20 Apr '05

20 Apr '05

Hi, There was a discussion here recently about registering a callback to be called prior to shutdown (using addSystemEventTrigger), and I just wanted to ask, what does Twisted allow before shutdown, and what gets stopped in the middle; ex. if I want to do something prior to shutdown that involves communication with some server, and hence a deffered chain, how do I make sure that it gets a chance to happen? Thanks, Joe. __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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[Twisted-Python] Event dispatcher example and deferreds
by Qvx 3000 19 Apr '05

19 Apr '05

Consider the following twisted example:: class Event: def _parse ... def __str__ ... class EventChannel(basic.Int32StringReceiver): def connectionMade(self): self.factory.eventConnectionMade(self) def connectionLost(self, reason): self.factory.eventConnectionLost(self, reason) def stringReceived(self, recd): event = Event._parse(recd) self.factory.eventReceived(self, event) def sendEvent(self, devent): devent.addCallback(lambda e: self.sendString(str(e))) class EventService(service.Service): def __init__ (self): self.registry = {} self.clients = {} self.funcs = dict(bind=self._bind, unbind=self._unbind) def getEventFactory(self): f = protocol.ServerFactory() f.protocol = EventChannel f.eventConnectionMade = self.eventConnectionMade f.eventReceived = self.eventReceived f.eventConnectionLost = self.eventConnectionLost return f def eventConnectionMade(self, proto): self.clients[id(proto)] = proto def eventReceived(self, proto, event): func = self.funcs.get(event.name, self._notify) func(event) def eventConnectionLost(self, proto, reason): # remove from list of clients if self.clients[id(proto)] == proto: del self.clients[id(proto)] # remove from registry for event_name, protos in self.registry.items(): if proto in protos: protos.remove(proto) def _bind (self, event, proto): current = self.registry.setdefault(event.event_name, []) if proto not in current: current.append(proto) def _unbind (self, event, proto): protos = self.registry.get(event.event_name, []) if proto in protos: protos.remove(proto) def _notify (self, event): current = self.registry.get(event.name, []) for proto in current: #if proto connected: proto.sendEvent(defer.succeed(event)) This is a simple event dispatching service. It receives connections from clients (channels). Upon receiving new connection service remembers the connection. Each connection can bind to specific event(s). This is achieved by sending <bind> event. After the client binds to event, it will receive event notifications whenever a dispatcher receives such events from any client. It is similar to GUI messaging systems. I have a few questions: 1. Do I have to use deferreds? And more importantly - HOW? I am worried that one slow connection could have impact on other connections. I definitely want to avoid this. (service is only dispatching events - there are no DB or filesystem operations) 2. What if I try to send event to recently closed channel of which I am not aware yet (connectionLost could be inside a long queue perhaps - am I talking any sense?). 3. How can I assign some kind of ID to automagically created EventChannel? I guess id(obj) is not good enough. 4. I'm curious: is there any limit to the number of open connections? Could twisted on Windows handle 10,000 or even 100,000 concurrent connections? (I will test this, but maybe somebody has some kind of real life example) Thanks, Qvx

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[Twisted-Python] Help parsing with microdom
by xhantt 19 Apr '05

19 Apr '05

Hi, I'm using microdom to parse some xml input. >From the following example I wan to get 'hello' string import sys from twisted.web import microdom d = microdom.parseString('<html><body>hello</body></html>') print d.childNodes[0].childNodes[0].childNodes[0] But i get Text('hello'), please help any suggestion will be appreciated.

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[Twisted-Python] Patch for Issue844: Return PB Exceptions that have registered unjellyable
by Justin Johnson 19 Apr '05

19 Apr '05

Will someone pretty please apply the patch I submitted for Issue844? The patch now includes tests. :-) http://twistedmatrix.com/bugs/issue844

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[Twisted-Python] Domain Filter Suggestions
by Charles Moad 18 Apr '05

18 Apr '05

Hi, I am working on a soap service that I am wanting to implement a domain filter on. Basically, if I get an IP I do not know, I defer a reverse dns lookup and accept their request. The defer does the reverse dns lookup and records whether they were a .edu or not. If I get another request from the same IP I reject or accept their request based on the previous lookup. I have an implementation that is pretty much working, but for some lookups I get an error since the machine does not have ipv6 enabled. (Why is this a dependency?) Here is a little code based on previous postings on rdns. from twisted.names import client addr = '127.0.0.1' # any ip goes here ptr = '.'.join(addr.split('.')[::-1]) + '.in-addr.arpa' d = client.lookupPointer(ptr) d.addCallback(lambda ans, auth, add: log.write(ans[0].payload.name)) Is this approach stupid? :) Any suggestions as to the cleanest approach to this are greatly appreciated! Thanks, Charlie

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Re: [Twisted-Python] mktap.py missing from Twisted 2.0 Windows installer
by Jp Calderone 18 Apr '05

18 Apr '05

On Mon, 18 Apr 2005 09:02:15 -0500, Justin Johnson <justinjohnson(a)gmail.com> wrote: >I just installed Twisted 2.0 on Windows XP using the Python 2.3 installer at >http://twisted.sourceforge.net/Twisted_NoDocs-2.0.0.win32(installer-rc3)-py…. >After installing, mktap.py can't be found anywhere in any subdirectories of >my Python install. > Thanks for the report. I've created an issue in the bug tracker and assigned it to Cory. Just a reminder, Twisted's bug tracker is at <http://twistedmatrix.com/bugs/> and bugs reported there, rather than on the mailing list, are more likely to get developer attention. Jp

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[Twisted-Python] twisted 2 mktap runs but
by jean-marc.pouchoulon＠ac-montpellier.fr 18 Apr '05

18 Apr '05

bonjour, portforward.tap is valid but : /usr/local/bin/mktap -u 80030 portforward -p 10526 -h machine.domain -d 10530 which: no dia in (/home/bin:/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin :/usr/X11R6/bin:/root/bin) Traceback (most recent call last): File "/usr/local/lib/python2.4/site-packages/twisted/scripts/mktap.py", line 193, in run options.parseOptions(sys.argv[1:]) File "/usr/local/lib/python2.4/site-packages/twisted/python/usage.py", line 197, in parseOptions self.postOptions() File "/usr/local/lib/python2.4/site-packages/twisted/scripts/mktap.py", line 175, in postOptions self.tapLookup = loadPlugins(debug, progress) File "/usr/local/lib/python2.4/site-packages/twisted/scripts/mktap.py", line 75, in loadPlugins for plug in plugins: --- <exception caught here> --- File "/usr/local/lib/python2.4/site-packages/twisted/plugin.py", line 203, in getPlugIns adapted = interface(plugin, None) File "/usr/local/lib/python2.4/site-packages/zope/interface/interface.py", line 658, in __call__ adapter = conform(self) File "/usr/local/lib/python2.4/site-packages/twisted/plugin.py", line 77, in __conform__ return self.load() File "/usr/local/lib/python2.4/site-packages/twisted/plugin.py", line 72, in load return namedAny(self.dropin.moduleName + '.' + self.name) File "/usr/local/lib/python2.4/site-packages/twisted/python/reflect.py", line 389, in namedAny obj = getattr(obj, n) exceptions.AttributeError: 'module' object has no attribute 'twisted_news' miss something ? thanks

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Twisted April 2005