Mailman 3 September 2014 - Twisted

[Twisted-Python] jelly and instances
by Wolfgang Rohdewald Sept. 10, 2014

Sept. 10, 2014

doc says: Instance: s is an instance of UserString.UserString, with a __dict__ {'data': 'hello'}:: [\"UserString.UserString\", ['dictionary', ['data', 'hello']]] There is no test for instances. To be precise, no test ever enters jelly._unjelly_instance() I also cannot find any place in jelly.py where an Instance would be jellied. There is instance_atom = 'instance' but instance_atom is not used anywhere. Is this outdated code? If not, could you please give me a code example using this? -- Wolfgang

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[Twisted-Python] pb.Copyable knowledge barrier
by Kevin Mcintyre Sept. 8, 2014

Sept. 8, 2014

goal: Give knowitall.py awareness of wordsmith.py addition. to run ./library.sh # opens 7999 for remote_dictionary and remote_define methods then both: python knowitall.py python wordsmith.py library.sh due to main/jelly issues

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[Twisted-Python] PEP3131: non-ascii identifiers
by Wolfgang Rohdewald Sept. 8, 2014

Sept. 8, 2014

This does not seem to be supported by Python yet. Should that be enabled at all? If one process with PY3 sends such identifiers to a separate process with PY2, that will fail. I am not sure if that would be a problem, whoever uses this must make sure PY3 is used everywhere. If this should be forbidden, I will add a test to test_pb for this. And of course somebody should document that somewhere. There more PEP3131 is used, the more users will fall into this trap. If this should be enabled (… [View More]

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[Twisted-Python] Weekly Bug Summary
by trac＠twistedmatrix.com Sept. 7, 2014

Sept. 7, 2014

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[Twisted-Python] spawnProcess - reapProcess not retrying on failures
by Adi Roiban Sept. 5, 2014

Sept. 5, 2014

Hi, While using spawnProcess on Linux I found out that when an invalid executable is called there is a corner case in which a zombie process is left until main process exists and can not be closed. I wrote a test for this but I was not able to reproduce this error in isolation, event if I run the test for 10000 times. reapProcess will always succeed from the first call. For the production code I can always reproduce the problem. Inspecting the execution thread I found out that all pipes are … [View More]

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[Twisted-Python] Graceful shutdown of twistd application
by Fabio Sangiovanni Sept. 5, 2014

Sept. 5, 2014

Hello list, I need to implement a graceful shutdown procedure for a twistd application. The application is made up of two services: an internet.TCPClient and an internet.TCPServer. They're glued together with a MultiService instance, which is in turn set to have 'application' as parent. The server and the client work together, making a proxy (SMTP server and AMQP client). My goal is the following: - intercept a SIGTERM signal - 'block' on the server side: since it's SMTP I get this by setting … [View More]

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[Twisted-Python] High throughput database logger
by Adi Libotean Sept. 4, 2014

Sept. 4, 2014

Hi, I'm looking at various options for implementing a high throughput database logger that will work with Twisted. My requirements, listed by importance: 1) small memory footprint 2) high speed 3) low garbage generation The application I'm working on runs continuously (24/7). I've experimented a bit with pysqlite and Twisted to see which approach is better suited (see attached example). ---- Question 1: I noticed that all of the Twisted based versions are very slow compared to the … [View More]

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[Twisted-Python] what is a non-class class?
by Wolfgang Rohdewald Sept. 3, 2014

Sept. 3, 2014

>From spread/jelly.py in _unjelly_method: - if type(im_class) is not types.ClassType: raise InsecureJelly("Method found with non-class class.") Same problem in _unjelly_instance What is a non-class class or rather what sort of types is meant to be insecure? Suggestions for a better error message instead of "non-class class"? This should work with both old style and new style classes, right now it works only for old style and fails for new style. Working with Python3 … [View More]

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[Twisted-Python] Return only when value/handle is available
by vikas kumar Sept. 3, 2014

Sept. 3, 2014

Hi, I am little new to twisted. I've a function(get_handle) which returns a handle. But get_handle() may throw an exception(SystemDelayException) because of some delay in system. My requirement is : When I get SystemDelayException re-attempt get_handle() and return only when handle is available. How do I use deferred/reactor in this scenario? try: handle = yield self.get_handle() except SystemDelayException: // code to re-attempt get_handle and return only when handle is available Regards Vikas

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[Twisted-Python] spawnProcess with timeout and same error handling on Unix and Windows
by Adi Roiban Sept. 3, 2014

Sept. 3, 2014

Hi, If I call spawnProcess with a bad executable, on Unix the process will exit with exit code 1 while on Windows an OSError is raised. I am working on a multi-OS software and to make my life easier I ended up with this hack inspired by _BackRelay https://gist.github.com/adiroiban/bac493f00ce5e94738ce ---- Is there something already in Twisted doing this? Am I reinventing the wheel? If not, do you think that it would help to update _BackRelay to support timeout and cross-os error handling?… [View More]

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[Twisted-Python] Using spawnProcess
by Grigorescu Ciprian Sept. 1, 2014

Sept. 1, 2014

Hello, I have wrote a custom protocol(inherit from SMTPClient) and factory(inherit from ClientFactory) in order to send emails from multiple ips(multiple connections, factories). Now I want to run this pice of code multiple times using spawnProcess to send emails simultaneous, each process having "n" connections from "n" ips. How can i use spawnProcess? Or is another way to send emails in a parallel fashion with twisted? Maybe another approach? Thank you,

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[Twisted-Python] jelly with new-style classes: method references are not resolved
by Wolfgang Rohdewald Sept. 1, 2014

Sept. 1, 2014

Hi, while trying to port jelly to Python 3 (banana tests already pass with Python 3), I found a bug in jelly. It has already been reported 3 years ago with ticket 4935. And there is a fix attached to that ticket. This fix resolves the problem for me. Why has this fix never been included? It is necessary for porting to Python 3. -- Wolfgang

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