Mailman 3 May 2013 - Twisted

[Twisted-Python] New registrations to this mailing list broken?
by Laurens Van Houtven 28 May '13

28 May '13

Hi, Sending this hoping that it will in fact make it through ;) Lynn Root (rougelynn) mentioned a few minutes ago on the IRC channel that she was unable to join the Twisted mailing list: 09:25 < roguelynn> hey glyph + tomprince - I'm trying to get on the twisted mailing this but see this error http://glui.me/?i=7ckizft82fokgnt/2013-05-28_at_11.22.18_AM.png/ The short version of that image (just in case it goes down or something) is that Mailman is complaining that the CGI app is run with group t-web, and it was expecting to run as www-data. Solutions include: change the group to be www-data, or re-run the configuration script with flag --with-cgi-gid=t-web Thanks! lvh

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com 26 May '13

26 May '13

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[Twisted-Python] Announcing Crochet 0.7: Easily use Twisted from threaded applications
by Itamar Turner-Trauring 25 May '13

25 May '13

Crochet is an MIT-licensed library that makes it easier for threaded applications like Flask or Django to use the Twisted networking framework. Features include: - Runs Twisted's reactor in a thread it manages. - Hooks up Twisted's log system to the Python standard library loggingframework. Unlike Twisted's built-in logging bridge, this includes support for blocking Handler instances. - Provides a blocking API to eventual results (i.e. Deferred instances). This release includes better documentation and API improvements, as well as better error reporting. Here is a simple example of using Crochet: import sys from twisted.web.client import getPagefrom crochet import setup, run_in_reactorcrochet.setup() @run_in_reactordef download_page(url): return getPage(url) result = download_page(sys.argv[1])# wait() returns the result when it becomes available:print result.wait() You can see more examples, read the documentation, and download the package at: https://pypi.python.org/pypi/crochet -- Itamar Turner-Trauring, Future Foundries LLC http://futurefoundries.com/ — Twisted consulting, training and support.

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[Twisted-Python] How does Twisted handle multiple request at the same time ?
by abhishek unnikrishnan 23 May '13

23 May '13

hi guys i'm new to twisted and asynchronous programming . i have created a rpc server using twisted and xmlrpc packages . i wanted to know what will happen if two or more clients give an rpc call at the same time. how will the server handle this situation. and also wanted to know is there a way for the server to call the client in an rpc scenario . thanks in advance

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[Twisted-Python] t.test.proto_helpers.StringTransportWithDisconnection.connectionLost
by Adi Roiban 22 May '13

22 May '13

Hi, In proto_helpers, StringTransportWithDisconnection is implemented as: class StringTransportWithDisconnection(StringTransport): def loseConnection(self): if self.connected: self.connected = False self.protocol.connectionLost(error.ConnectionDone("Bye.")) In the API, I see that for IProtocol.connectionLost(reason), readon should be a Failure and not an Exception. http://twistedmatrix.com/documents/13.0.0/api/twisted.internet.interfaces.I… ------ Also checking some real code in protocols.ftp shows that reason should be a Failure, as it uses reason.check() method. https://github.com/twisted/twisted/blob/trunk/twisted/protocols/ftp.py#L2269 ------ Is this a bug in the current implementation of StringTransportWithDisconnection? Many thanks, -- Adi Roiban

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[Twisted-Python] twisted server blocking on MySQL read in main thread when using adbapi.ConnectionPool
by Dan Williams 21 May '13

21 May '13

...and I don't understand why it is running in the main (reactor) thread. I have a twisted.web server that uses adbapi.ConnectionPool to read and sometimes update a MySQL database with small amounts of data at a fairly high rate. It's been stable for quite a while, but is now seeing increasing load and been hanging a couple of times a day. monit gets triggered when the web server fails to respond to an HTTP GET health check. SIGTERM won't terminate it, so I'm using monit to send it SIGABRT. Examining the core file shows that the main (reactor) thread is blocking in a read in the mysql client library: > Program terminated with signal 6, Aborted. > #0 0x00007f549b341d2d in read () from > /lib/x86_64-linux-gnu/libpthread.so.0 > (gdb) bt 10 > #0 0x00007f549b341d2d in read () from > /lib/x86_64-linux-gnu/libpthread.so.0 > #1 0x00007f5497429112 in vio_read_buff () from > /usr/lib/x86_64-linux-gnu/libmysqlclient.so.18 > #2 0x00007f549741b24f in ?? () from > /usr/lib/x86_64-linux-gnu/libmysqlclient.so.18 > #3 0x00007f549741bde8 in my_net_read () from > /usr/lib/x86_64-linux-gnu/libmysqlclient.so.18 > #4 0x00007f54974155ba in cli_safe_read () from > /usr/lib/x86_64-linux-gnu/libmysqlclient.so.18 > #5 0x00007f5497416618 in ?? () from > /usr/lib/x86_64-linux-gnu/libmysqlclient.so.18 > #6 0x00007f5497413f8b in mysql_next_result () from > /usr/lib/x86_64-linux-gnu/libmysqlclient.so.18 > #7 0x00007f549792bccc in ?? () from > /usr/lib/python2.7/dist-packages/_mysql.so > #8 0x0000000000497ea4 in PyEval_EvalFrameEx () > #9 0x0000000000498602 in PyEval_EvalFrameEx () > (More stack frames follow...) > (gdb) bt -10 > #62 0x0000000000498602 in PyEval_EvalFrameEx () > #63 0x0000000000498602 in PyEval_EvalFrameEx () > #64 0x0000000000498602 in PyEval_EvalFrameEx () > #65 0x0000000000498602 in PyEval_EvalFrameEx () > #66 0x000000000049f1c0 in PyEval_EvalCodeEx () > #67 0x00000000004a9081 in PyRun_FileExFlags () > #68 0x00000000004a9311 in PyRun_SimpleFileExFlags () > #69 0x00000000004aa8bd in Py_Main () > #70 0x00007f549a05976d in __libc_start_main () from > /lib/x86_64-linux-gnu/libc.so.6 > #71 0x000000000041b9b1 in _start () > (gdb) All of the 10 thread pool threads are sitting waiting on locks: > (gdb) thread 11 > [Switching to thread 11 (Thread 0x7f54963dd700 (LWP 2691))] > #0 0x00007f549b340fd0 in sem_wait () from > /lib/x86_64-linux-gnu/libpthread.so.0 > (gdb) bt 10 > #0 0x00007f549b340fd0 in sem_wait () from > /lib/x86_64-linux-gnu/libpthread.so.0 > #1 0x0000000000547525 in lock_PyThread_acquire_lock.49023 () > #2 0x0000000000497ea4 in PyEval_EvalFrameEx () > #3 0x000000000049f1c0 in PyEval_EvalCodeEx () > #4 0x00000000004983b8 in PyEval_EvalFrameEx () > #5 0x000000000049f1c0 in PyEval_EvalCodeEx () > #6 0x00000000004983b8 in PyEval_EvalFrameEx () > #7 0x000000000049f1c0 in PyEval_EvalCodeEx () > #8 0x00000000004a8a92 in function_call () > #9 0x00000000004e9f36 in PyObject_Call () > (More stack frames follow...) > (gdb) What has me very confused is seeing the MySQL read happening in the main thread; how can that be? This is running in AWS EC2 on a pretty busy host but there isn't any discernible correlation between times of high I/O or CPU usage and the hangs. Environment is Ubuntu 12.04.1 LTS, Python 2.7.3, Twisted 11.1.0. Thanks for any help! Dan

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[Twisted-Python] modal dialogs with the qt4reactor?
by Donal McMullan 20 May '13

20 May '13

In a 2006 email, Ed Suominen links to two copies of "a non-blocking modal dialog, immediately obtaining a deferred to the user's eventual input." http://twistedmatrix.com/pipermail/twisted-python/2006-September/014077.html I'd love to know how to do this, but both sites are unreachable. The internet giveth and the internet taketh awayeth. Can anyone help? Thanks! Donal

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com 19 May '13

19 May '13

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[Twisted-Python] question : How to listen to USB-HID
by bino＠indoakses-online.com 18 May '13

18 May '13

Dear All ... Currently I have a twistd script that listen to arduino dev board. Arduino recognized as plain usb-serial, so I can do it using LineReceiver as simple as : --> class ArduinoReceiver(LineReceiver) And make it SerialService as told by http://www.mentby.com/lucas-taylor/serialport-protocol-as-a-service.html But I plan to replace arduino with digispark ( http://digistump.com/products/1 ) Problem is I just realize that this device will recognized as USB-HID Kindly please give me any enlightenment on how to handle USB-HID device with twistd ? Sincerely -bino-

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[Twisted-Python] yuyan zhang 邀请您开设 Google 电子邮件帐户
by yuyan zhang 14 May '13

14 May '13

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