Mailman 3 April 2005 - Twisted

[Twisted-Python] simpleclient.py exception
by Mel Irizarry 05 Apr '05

05 Apr '05

Do I have something missing or misconfigured? When I run simpleclient.py I get this: Server said: hello, world! connection lost Connection lost - goodbye! Traceback (most recent call last): File "simpleclient.py", line 52, in ? main() File "simpleclient.py", line 48, in main reactor.run() File "/usr/lib/python2.3/site-packages/twisted/internet/posixbase.py", line 200, in run self.mainLoop() File "/usr/lib/python2.3/site-packages/twisted/internet/posixbase.py", line 208, in mainLoop self.runUntilCurrent() --- <exception caught here> --- File "/usr/lib/python2.3/site-packages/twisted/internet/base.py", line 533, in runUntilCurrent call.func(*call.args, **call.kw) File "/usr/lib/python2.3/site-packages/twisted/internet/base.py", line 389, in _continueSystemEvent for callList in sysEvtTriggers[1], sysEvtTriggers[2]: exceptions.TypeError: unsubscriptable object -- Best Regards, Mel Irizarry ----------------------------- I can't go to school 'cause I ain't got a gun I ain't got a gun 'cause I ain't got a job I can't get a job 'cause I can't go to school Lost in America - Alice Cooper

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[Twisted-Python] Re: [Twisted-commits] r13446 - After a lengthy discussion, revert to previous threaded behavior wrt registering as the IO thread
by James Y Knight 05 Apr '05

05 Apr '05

On Apr 3, 2005, at 1:58 AM, Jp Calderone wrote: > After a lengthy discussion, revert to previous threaded behavior wrt > registering as the IO thread > Modified: trunk/twisted/internet/posixbase.py > ======================================================================= > ======= > --- trunk/twisted/internet/posixbase.py (original) > +++ trunk/twisted/internet/posixbase.py Sat Apr 2 23:58:11 2005 > @@ -155,7 +155,6 @@ > ReactorBase.__init__(self) > if self.usingThreads or platformType == "posix": > self.installWaker() > - threadable.whenThreaded(threadable.registerAsIOThread) > > def _handleSignals(self): > """Install the signal handlers for the Twisted event loop.""" You **do** realize this means isInIOThread always returns false after threading is enabled, if the reactor was started before threading was enabled, right? Something like the following should be run in the test suite. It has to be in a separate process, though, to ensure it's in the incorrect state, so something needs to be done about passing in the reactor to run, also. from twisted.python import threadable from twisted.internet import reactor def testIsInIOThread(): print "1)", threadable.isInIOThread() threadable.init(1) print "2)", threadable.isInIOThread() reactor.crash() reactor.callWhenRunning(testIsInIOThread) reactor.run() > @@ -202,10 +201,6 @@ > self.startRunning(installSignalHandlers=installSignalHandlers) > self.mainLoop() > > - def iterate(self, delay=0): > - threadable.registerAsIOThread() > - ReactorBase.iterate(self, delay) > - > def mainLoop(self): > while self.running: > try: iterate() is the external API, I think it, like startRunning, should also ensure the thread it's being called on is marked as the IO thread. James

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RE: [Twisted-Python] Creating an NT Service for a twistd script
by Grant McDonald 04 Apr '05

04 Apr '05

Cory, I did read your readme thoroughly and it only specifies the application of the patch for py2exe version 0.5.4. As I am currently using 0.5.0 (i thought that this fell within the py2exe 0.5+ category but perhaps i am mistaken) i did not apply the patch. Is this what is causing the issue? Thanks in advance, Grant -----Original Message----- From: twisted-python-bounces(a)twistedmatrix.com [mailto:twisted-python-bounces@twistedmatrix.com]On Behalf Of Cory Dodt Sent: 01 April 2005 03:38 To: Twisted general discussion Subject: Re: [Twisted-Python] Creating an NT Service for a twistd script -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi Grant, Been on vacation so I'm still catching up, sorry for the slow reply. This sounds like an unpatched py2exe. Did you look at the README.txt in my sandbox? There's a patch in there you need. TH has already applied it to py2exe's development codeline but there hasn't been a release yet. C Grant McDonald wrote: | Hi All, | | I am receiving the following error when i run the <filename>ctl.exe | generated with moonfallen's ntsvc module and py2exe: | | Traceback (most recent call last): | File "boot_service.py", line 21, in ? | RuntimeError: No service classes found | | Can someone please point me in the right direction?? | | Grant | |

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[Twisted-Python] cleanup at reactor.stop
by Henning.Ramm＠mediapro-gmbh.de 04 Apr '05

04 Apr '05

This is probably a stupid question, but I'm stuck... I need to clean up some objects if (that is, before) reactor.stop is called. Is there something like reactor.runAtShutdown() or how should I do this? Best regards, Henning Hraban Ramm Südkurier Medienhaus / MediaPro Support/Admin/Development Dept.

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RE: [Twisted-Python] cleanup at reactor.stop
by Henning.Ramm＠mediapro-gmbh.de 04 Apr '05

04 Apr '05

>>Is there something like reactor.runAtShutdown() or how should >I do this? >You can hook into the reactor by registering a system event callback. >See twisted.internet.interfaces.IReactorCore's addSystemEventTrigger, >removeSystemEventTrigger and fireSystemEvent. > >You may need to grep the Twisted code to find out all the events that >are actually fired but the one you want is "shutdown". Thank you. It works. I just found these methods myself, but was not sure if they are the right way. (I always get lost in the API docs - I find it strange to look after internet.reactor at internet.interfaces.IReactorCore). Best regards, Henning Hraban Ramm Südkurier Medienhaus / MediaPro Support/Admin/Development Dept.

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[Twisted-Python] Looking for a simple file event driven loop using Twisted
by steven howe 04 Apr '05

04 Apr '05

Hello, I'm looking for some example code I can use to build an app from. I need to 'wait' or sleep for new data in a file. Then wake and process the data. The file is a regular file, not a pipe. It is the output of a existing program (i.e., not mine to modify). Needless to say, the API for hugh. I'm need some help finding the right tools. Thanks, Steven Howe

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RE: [Twisted-Python] Looking for a simple file event driven loop usingTwisted
by Henning.Ramm＠mediapro-gmbh.de 04 Apr '05

04 Apr '05

>I'm looking for some example code I can use to build an app from. I >need to 'wait' or sleep for new data in a file. Then wake and process >the data. Find attached a Windows specific directory watcher; it's not really what you asked for, but perhaps it's of use. I can't guarantee it really does what it should - it looks like, but the code isn't mature. Best regards, Henning Hraban Ramm Südkurier Medienhaus / MediaPro Support/Admin/Development Dept.

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[Twisted-Python] Stable release branch
by James Y Knight 04 Apr '05

04 Apr '05

So I've volunteed to do backports from trunk to the stable (currently 2.0.x) branch for important fixes. "Important" is up for discussion, but here's what I'm thinking: Important means one of: 1) installer brokenness 2) fixes a regression 3) fixes nonfunctional new API Also (and this is not really up for discussion): 1) patch must be small (and correct). Even if it meets one of the above criteria, if it is a large or non-obviously-correct change, I don't want to see it. 2) must not add APIs. 3) if it's been broken for a long time (e.g. in the 1.3 release), it can stand to be broken a little while longer. I'll watch for things I think are appropriate, but, if anyone else wants to point out some svn revisions of changes they think would be appropriate, that's fine too. Now, before people start suggesting that every change be backported (which obviously isn't going to happen), we probably ought to set a goal for the next "real" release (2-3 months?). I expect the 2.0.1 release should go out this week sometime. I think win32 build fixes ought to land first, but that's about all I know of. I'd also love to include the changes to the release scripts which will allow the version to exist in the __version__s in the SVN repository instead of being specified on the command-line by the person releasing. Having consistent versions is important. Someone just needs to write those changes first. However, that doesn't affect the released tarballs at all, so it's not really necessary for before-2.0.1. Here's what I did so far: > Log: > Backports from trunk: > 13307 (twisted/topfiles/README) - we support 2.4 too > 13324 (twisted/internet/defer.py) - [947] Fix DeferredQueue > backlog/size limit. > 13354 (twisted/plugins/__init__.py) - Correct maintainer address. > 13355 (twisted/test/test_defer.py) - improvements to DeferredQueue > test case > 13387 (setup.py) - add news to list of subprojects James

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Re: [Twisted-Python] How can I call internet.MulticastServer() to enable listenMultiple?
by Brian Warner 03 Apr '05

03 Apr '05

>> Why are you passing a factory in? UDP and Multicast don't use factories. > > Ok what I am trying to do is make a ZeroConfService It is worth pointing out that IP Multicast works in terms of _groups_. When you are listening on a socket, you must specify both UDP port number and the group id. (IPv4 groups are specified with an IP address in the "class D" range, 224.foo.foo.foo). If you just listen on port 5353, you're listening for packets directed at one of your node's unicast ip addresses. If you bind it to a specified group (224.0.0.251 is probably the one you want), then you get packets sent to that multicast group, and multiple programs on a single host can listen on the same multicast group. Itamar's mdns.py code in the sandbox[1] uses the following routine (in a DatagramProtocol subclass) to set up the receiver: def startListening(self): reactor.listenMulticast(5353, self, maxPacketSize=1024, listenMultiple=True) self.transport.joinGroup(MDNS_ADDRESS) self.transport.setTTL(255) self.transport.setLoopbackMode(False) You'll probably need to do something similar. cheers, -Brian [1]: svn://svn.twistedmatrix.com/svn/Twisted/sandbox/itamar/mdns

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[Twisted-Python] pending fixes
by Andrea Arcangeli 03 Apr '05

03 Apr '05

Just as reminder, this is my pending patch against SVN. .disconnecting can be added to all protocols or it can be renamed... (or we could use hasattr in the meantime) Index: Twisted/twisted/protocols/basic.py =================================================================== --- Twisted/twisted/protocols/basic.py (revision 13459) +++ Twisted/twisted/protocols/basic.py (working copy) @@ -166,9 +166,23 @@ """ return error.ConnectionLost('Line length exceeded') +class PauseProducer(object): + paused = False + def pauseProducing(self): + self.paused = True + self.transport.pauseProducing() -class LineReceiver(protocol.Protocol): + def resumeProducing(self): + self.paused = False + self.transport.resumeProducing() + self.dataReceived('') + + def stopProducing(self): + self.paused = True + self.transport.stopProducing() + +class LineReceiver(protocol.Protocol, PauseProducer): """A protocol that receives lines and/or raw data, depending on mode. In line mode, each line that's received becomes a callback to @@ -188,7 +202,6 @@ __buffer = '' delimiter = '\r\n' MAX_LENGTH = 16384 - paused = False def clearLineBuffer(self): """Clear buffered data.""" @@ -279,21 +292,8 @@ """ return self.transport.loseConnection() - def pauseProducing(self): - self.paused = True - self.transport.pauseProducing() - def resumeProducing(self): - self.paused = False - self.dataReceived('') - self.transport.resumeProducing() - - def stopProducing(self): - self.paused = True - self.transport.stopProducing() - - -class Int32StringReceiver(protocol.Protocol): +class Int32StringReceiver(protocol.Protocol, PauseProducer): """A receiver for int32-prefixed strings. An int32 string is a string prefixed by 4 bytes, the 32-bit length of @@ -314,7 +314,7 @@ """Convert int32 prefixed strings into calls to stringReceived. """ self.recvd = self.recvd + recd - while len(self.recvd) > 3: + while len(self.recvd) > 3 and not self.paused and not self.transport.disconnecting: length ,= struct.unpack("!i",self.recvd[:4]) if length > self.MAX_LENGTH: self.transport.loseConnection() @@ -331,7 +331,7 @@ self.transport.write(struct.pack("!i",len(data))+data) -class Int16StringReceiver(protocol.Protocol): +class Int16StringReceiver(protocol.Protocol, PauseProducer): """A receiver for int16-prefixed strings. An int16 string is a string prefixed by 2 bytes, the 16-bit length of @@ -351,7 +351,7 @@ """Convert int16 prefixed strings into calls to stringReceived. """ self.recvd = self.recvd + recd - while len(self.recvd) > 1: + while len(self.recvd) > 1 and not self.paused and not self.transport.disconnecting: length = (ord(self.recvd[0]) * 256) + ord(self.recvd[1]) if len(self.recvd) < length+2: break Index: Twisted/twisted/lore/latex.py =================================================================== --- Twisted/twisted/lore/latex.py (revision 13459) +++ Twisted/twisted/lore/latex.py (working copy) @@ -104,7 +104,7 @@ baseLevel = 0 try: - diaHack = not not os.popen('which dia').read() + diaHack = not not os.popen('which dia 2>/dev/null').read() except: # That's a no, then. diaHack = 0

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