Mailman 3 September 2007 - Twisted

Re: [Twisted-Python] Properly handling Connection Refused
by Beau Hargis 05 Sep '07

05 Sep '07

Well, it subclasses 'protocol.ClientFactory'. I did not try 'ReconnectingClientFactory' yet as I wanted a little bit more control of the reconnecting process at some point. In any case, these functions are defined in the class as such: def clientConnectionFailed(self, connector, reason): print 'Connection failed. Reason: ', reason reactor.callLater(random.randint(10,91), connector.connect) def clientConnectionLost(self, connector, reason): print 'Connection Lost. Reason: ', reason reactor.callLater(random.randint(10,91), connector.connect) Works ok for every other problem except Connection Refused. When I first started testing reconnect, the seconds argument to callLater was constant like 3 or 4 seconds and it did the same thing. Even immediate reconnection caused the same problem with Connection Refused: 111. ----- Original Message ---- From: Jean-Paul Calderone <exarkun(a)divmod.com> To: Twisted general discussion <twisted-python(a)twistedmatrix.com> Sent: Wednesday, September 5, 2007 12:29:15 PM Subject: Re: [Twisted-Python] Properly handling Connection Refused On Wed, 5 Sep 2007 12:24:35 -0700 (PDT), Beau Hargis <beau(a)subobscur.us> wrote: >I have this application built in twisted that is pretty robust save for one thing. The server reconnects when it falters or fails for any reason EXCEPT a refused connection, which happens when connecting to services on the Windows servers we have where particular services have not yet been started, which is normal. Every other failure is handled gracefully, including the database disappearing suddenly. I print out the reason in the log and I get this error: > >[Uninitialized] Reason: [Failure instance: Traceback (failure with no frames): <class 'twisted.internet.error.ConnectionRefusedError'>: Connection was refused by other side: 111: Connection refused. >[Uninitialized] ] >[Uninitialized] Stopping factory <SomeFactory instance at 0x88b77ac> > >And the whole thing stops processing and does not restart the connection. How did you implement reconnection? Jean-Paul _______________________________________________ Twisted-Python mailing list Twisted-Python(a)twistedmatrix.com http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python

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[Twisted-Python] Properly handling Connection Refused
by Beau Hargis 05 Sep '07

05 Sep '07

I have this application built in twisted that is pretty robust save for one thing. The server reconnects when it falters or fails for any reason EXCEPT a refused connection, which happens when connecting to services on the Windows servers we have where particular services have not yet been started, which is normal. Every other failure is handled gracefully, including the database disappearing suddenly. I print out the reason in the log and I get this error: [Uninitialized] Reason: [Failure instance: Traceback (failure with no frames): <class 'twisted.internet.error.ConnectionRefusedError'>: Connection was refused by other side: 111: Connection refused. [Uninitialized] ] [Uninitialized] Stopping factory <SomeFactory instance at 0x88b77ac> And the whole thing stops processing and does not restart the connection. I am running on Ubuntu 7.04 with the twisted packages therein: python-twisted 2.5.0-0ubuntu3 Is this a bug that others have seen? Should I use the tarball from twisted Matrix or use the gutsy packages?

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[Twisted-Python] Re: Tell us how you're using Twisted
by Tomas Neme 05 Sep '07

05 Sep '07

We use twisted to make the networking platform for a number of MMO games that our client will be releasing sometime next year Tomas -- |_|0|_| |_|_|0| |0|0|0| (\__/) (='.'=)This is Bunny. Copy and paste bunny (")_(") to help him gain world domination.

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[Twisted-Python] Win32 IOCPReactor?
by Trent Nelson 05 Sep '07

05 Sep '07

I'm new to Twisted. Perusing the documentation, I came across IOCPReactor. It's marked as 'extremely experimental', and it appears it only provides support for TCP events. It seems the last check in to anything IOCPReactor-related was back in 2005. Is it dead? Is anyone using it? Is anyone planning to pick development back up? Were there specific issues with IOCP that impeded development, or just a general lack of people with time, inclination, or Win32-fu? Assuming the IOCPReactor's not feasible for high load production deployment, can anyone comment on how the default select()-based reactor for Win32 fares under high load? Trent.

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[Twisted-Python] Wrapping a Perspective Broker remote object with a blocking API
by Rasjid Wilcox 05 Sep '07

05 Sep '07

Hi everyone. I've done some reading, and it seems that there have been several attempts by new twisted users to get Perspective Broker to function more like Corba or DCOM. Despite having read http://twistedmatrix.com/pipermail/twisted-python/2007-April/thread.html#15… on why this does not work, I have had a go and have got something that seems to work well, at least for my test case. Server side it is pretty standard. Client side I run the twisted reactor in a separate (non-main) thread, and use threading.Event() objects placed into a 'pass through' callback to emulate blocking until the required deferred has its result. I have attached a simple server and client, with callback functionality illustrated. I have not really looked into the thread safety issues yet, but have been looking into reactor.callFromThread and whether it is required here. If the entire approach is inherently broken for some reason, I'd like to know so I can look at alternatives. Cheers, Rasjid.

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[Twisted-Python] Media Resource Control Protocol (MRCP)
by Ivan Uemlianin 04 Sep '07

04 Sep '07

Dear All I am interested in writing an MRCP (Media Resource Control Protocol [1]) server. In particular I want to write an MRCP speech recognition resource server as part of my trefnydd [2] project. I am posting here to ask for advice about the network programming part. I shall also be writing an MRCP client (if only to test the server). All the code will be GPL'd. As far as I understand it, an overview of the networking would go like this: An MRCP session between client and server is initiated using the Session Initiation Protocol (SIP). Client and server negotiate using SIP messages containing SDP message bodies to define the participants and the resources required in the session. After session initiation, two channels are launched: a media channel using RTP to carry binary audio (i.e., speech) data, and a control channel using TCP (control channel messages are text-based and in MRCP format). It seems to me that both client and server software would have to cope with SIP, SDP, RTP, MRCP (message format) and plain old TCP (for the SIP/SDP and MRCP control channel messages). Here are my questions: - Does anyone know of a FOSS project to write an MRCP server? preferably in python. I know of mrcp4j [3]. - My first plan would be to make the MRCP client/server a subclass of an SIP client/server, as SIP is used to set up (and tear down) the session. Does that sound sensible? - Can twisted.protocols.sip be used to write a SIP server? Would it give me everything I need, or would I also need something like pjsip [4] or jain-sip [5] for the low-level stuff? - Have I missed anything? Any advice would be gratefully received. I'll report back with progress. Best wishes Ivan [1] MRCP: http://www.llaisdy.com/static/tech/mrcp/ [2] trefnydd: http://www.llaisdy.com/static/trefnydd/ [3] mrcp4j: "MRCP4J provides a Java API that encapsulates the MRCPv2 protocol and can be used to implement MRCPv2 clients and/or servers." http://mrcp4j.sourceforge.net/ [4] pjsip: http://www.pjsip.org/ [5] jain-sip: https://jain-sip.dev.java.net/

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[Twisted-Python] Processing reload event
by Pavel Bastov 04 Sep '07

04 Sep '07

Hi all, how do I process the reload event (service <myservice> reload) in my Twisted application? TIA -- Good luck, Pavel Bastov xooChat Evangelist and Team Leader http://www.xoochat.com/

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Re: [Twisted-Python] SMS Protocol UCP /EMI
by Pascal Bach 04 Sep '07

04 Sep '07

I think it is best if I publish my UCP/EMI implementation somewhere, I'm currently thinking about a common API for different SMSC communication API. I currently know about SMPP, UCP/EMI and CIMD from Nokia. Is there any other protocol, maybe with some specialties that should be considered in the Interface. Is there actually an interest in such protocols in twisted? Pascal

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[Twisted-Python] Foolscap-0.1.6 released
by Brian Warner 02 Sep '07

02 Sep '07

I've released Foolscap-0.1.6, with a few minor bugfixes. The new release can be downloaded from PyPI or directly from the Foolscap home page: http://foolscap.lothar.com/releases/foolscap-0.1.6.tar.gz This release fixes the debian packaging problems that prevented 0.1.5 from being able to create .deb packages. It also fixes a problem with the ChoiceOf constraint, and fixes a couple of problems in the documentation. Foolscap versions 0.1.3 through 0.1.6 (inclusive) are fully wire-compatible with each other. Wire-compatibility-breaking changes are still anticipated in the future. Foolscap is a next-generation RPC/RMI/remote-object protocol, intended to eventually replace Perspective Broker. It offers remote object-capability facilities for Python programs using Twisted's event loop, based upon concepts and patterns from the E language (http://www.erights.org/). For more information and bug reporting, please visit the Foolscap home page at: http://foolscap.lothar.com/ cheers, -Brian

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com 02 Sep '07

02 Sep '07

Bug summary ______________________ Summary for 2007-08-26 through 2007-09-02 Bugs opened: 7 Bugs closed: 3 Total open bugs: 1024 (+4) |== Type Changes |== Priority Changes |== Component Changes |Defect: +5 |Highest: +2 |Core: +4 |Enhancement: +0 |High: +2 |Names: +1 |Normal: +1 |Pydoctor: -1 |Web: +1 New / Reopened Bugs ______________________ ===== Highest ===== [#2808] AMP should raise MissingArgument (or other) if a callRemote is called with wrong arguments (opened by Lacrymology) defect core http://twistedmatrix.com/trac/ticket/2808 [#2808] AMP should raise MissingArgument (or other) if a callRemote is called with wrong arguments (opened by Lacrymology) defect core http://twistedmatrix.com/trac/ticket/2808 ===== High ===== [#2807] twisted.mail.relaymanager.MXCalculator._cbMX raises unhandled IndexError for response with no answers (opened by exarkun) defect names http://twistedmatrix.com/trac/ticket/2807 [#2809] 99.9% cpu load when using the epoll reactor (opened by mvw) defect core http://twistedmatrix.com/trac/ticket/2809 ===== Normal ===== [#2805] Cooperator adds a callback to iterated deferreds which does not pass on the original result (opened by rwall) defect core http://twistedmatrix.com/trac/ticket/2805 [#2806] Twisted web client should support HTTPS URL hostname verification (opened by radix) enhancement web http://twistedmatrix.com/trac/ticket/2806 [#2810] AMP command-handling and protocol-parsing should be on separate objects (opened by glyph) enhancement core http://twistedmatrix.com/trac/ticket/2810 Closed Bugs ______________________ ===== Highest ===== [#2808] AMP should raise MissingArgument (or other) if a callRemote is called with wrong arguments (opened by Lacrymology, closed by Lacrymology, ) defect core http://twistedmatrix.com/trac/ticket/2808 ===== Normal ===== [#1639] Full package and class hierarchy pages. (opened by jknight, closed by exarkun, fixed) enhancement pydoctor http://twistedmatrix.com/trac/ticket/1639 [#2473] make twistd more usable (opened by itamarst, closed by glyph, invalid) enhancement core http://twistedmatrix.com/trac/ticket/2473 Ticket Lifetime Stats ______________________ Oldest open ticket - [#38] Should be a way to create documentation aliases (since 2003-07-12 16:08:03). Newest open ticket - [#2810] AMP command-handling and protocol-parsing should be on separate objects (since 2007-08-31 14:21:32). Mean open ticket age: 511 days, 15:26:23.405046. Median: 406 days, 14:01:43.587664. Standard deviation: 398 days, 11:41:57.222639. Interquartile range: 496 days, 3:03:16. Mean time between ticket creation and ticket resolution: 120 days, 15:02:59.593481. Median: 14 days, 8:13:35. Standard deviation is 224 days, 10:25:04.257292. The interquartile range is 127 days, 2:25:56. Mean time spent in review: 63 days, 14:54:37.734422. Median: 4 days, 4:50:20. Standard deviation: 138 days, 15:21:07.206937. Interquartile range: 30 days, 7:05:01. Mean number of times a ticket is reviewed: 1.91366906475. Median: 1 Standard deviation: 1.55081172087. Interquartile range: 1. Contributor Stats ______________________ In the last 4 weeks, 19 unique ticket reporters 7 unique ticket reviewers 6 unique ticket resolvers In the last 24 weeks, 80 unique ticket reporters 14 unique ticket reviewers 16 unique ticket resolvers In the last 48 weeks, 155 unique ticket reporters 20 unique ticket reviewers 27 unique ticket resolvers

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