Mailman 3 November 2005 - Twisted

[Twisted-Python] Python application requiring SSH and SNMPv3
by Brendan Simon Nov. 7, 2005

Nov. 7, 2005

Hi, I'm new to Twisted and have a few questions. I wish to write a GUI in wxPython that needs to communicate to a POSIX machine to execute commands and return results. The underlying application is a command-line based Configuration Management System called Aegis. I wish to use SSH to communicate and see that Twisted has Conch :) I also see that that there is another python ssh module called "paramiko" which looks like is less complex than Twisted. I'm trying to figure out which … [View More]

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[Twisted-Python] Remove setupClass branch of trial - what is the motivation?
by Itamar Shtull-Trauring Nov. 7, 2005

Nov. 7, 2005

Hi, Still haven't gotten an answer to this; why is the motivation for deprecating a perfectly reasonable feature?

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[Twisted-Python] Win32 installers of Twisted 2.1?
by Henning.Ramm＠mediapro-gmbh.de Nov. 6, 2005

Nov. 6, 2005

Dear twisted wizards, would it be possible to also release Win32 exe installers for Twisted 2.1? I'd prefer to always use the same way of installing things, if possible. But if you won't release any Windows binaries any more, please state that on the website. Best regards, Henning Hraban Ramm Südkurier Medienhaus / MediaPro Support/Admin/Development Dept.

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[Twisted-Python] does twisted.* support mobile code?
by Andrew Straw Nov. 6, 2005

Nov. 6, 2005

Hi, Does any part of twisted support mobile Python code? Something like Pyro's Mobile Code objects? http://pyro.sourceforge.net/manual/7-features.html#mobile Cheers! Andrew

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Re: [Twisted-Python] pb.Cacheable vs. offline queuing
by Brian Warner Nov. 6, 2005

Nov. 6, 2005

> I've been looking at Cacheable, as the live updates between servers > would be useful, but I have a few questions: > > How does it avoid collisions, if an attribute is changed on both ends > at once? Is any kind of 2PC involved, or similar? I read that some > part of reading/observing is atomic, but is modifying atomic as well? Luckily (well, for us at least :), there is no concept of "simultaneous" here. PB offers two distinct classes for cacheable use: pb.Cacheable on … [View More]the "sending" side, and pb.RemoteCache on the "receiving" side. Modification messages flow in one direction only. As long as you don't trigger some kind of reentrancy problem, each update message is basically atomic, but there is no mechanism in place to send changes back in the other direction. So if you want to allow both sides to change things, you will have to build some sort of layer on top of pb.Cacheable, which is where you'd put in your synchronization logic. You have to figure out when the "other" object is created, find a way to wire it back to its partner, and make sure that changes don't travel in endless loops between the two paired objects. > the two servers (public and office) must both keep serving users, even if > the connection between them is severed. Be aware that trying to accomodate disconnected operation is like planting kudzu in your flowerbed with a promise that you'll "keep an eye on it". Each time you think you've figured out everything there is to know about distributed synchronization, you discover a new academic paper explaining a new horrible failure method that you're vulnerable to. The depths awaiting to be plumbed know no bound. (the problem is basically equivalent to merging in a distributed version control system, and look at how many of *those* we've got running around :). Worse yet, the same problems actually exist in always-connected operation, it's just that you can trick yourself into thinking you can ignore them more often. Unidirectional dataflow is at least four orders of magnitude easier to deal with. > any collisions would be dealt with manually by the office staff once the > connection came back up. Good. You might still have a chance to retain your sanity :). Yeah, Cacheable won't be enough for you. My hunch is that you'll be implementing enough new code that you might as well not bother building it on top of pb.Cacheable: start with a pb.Referenceable and a remote_acceptUpdate method, an outboundUpdates() queue, and some setter methods to trigger outbound update messages. good luck, -Brian [View Less]

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[Twisted-Python] testing mailing lists after mailman upgrade
by Christopher Armstrong Nov. 5, 2005

Nov. 5, 2005

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[Twisted-Python] pb.Cacheable vs. offline queuing
by Jordan Krushen Nov. 4, 2005

Nov. 4, 2005

I'm designing a job-tracking/workflow system for a client, with a primary requirement being the use of a hosted server for web/RPC/REST/sftp presence (among other things, thanks to Twisted), and another local server internal to their office, both kept up to date with each other (each holding a local DB; I'm undecided on exactly which one). Users would use the web UI through the hosted server, office staff would use a Cocoa client speaking PB to the office server. Ignore the workstation-… [View More]

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[Twisted-Python] how to unitest this?
by sonium Nov. 4, 2005

Nov. 4, 2005

hi, I just read the introduction about unittesting on diveintopython and now asked myself how I could write a unittest for the connectionmade function in the code below taken from the tutorial: from twisted.internet.protocol import Protocol, Factory from twisted.internet import reactor class QOTD(Protocol): def connectionMade(self): self.transport.write("An apple a day keeps the doctor away\r\n") self.transport.loseConnection() # Next lines are magic: factory = … [View More]

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[Twisted-Python] Unjelly - recursion limit reached
by David K. Hess Nov. 4, 2005

Nov. 4, 2005

I've got a PB server that on client connect returns a Cacheable object that is at the top of a hierarchy of Cacheables that can grow pretty large. I am sometimes seeing an unjelly exception in the client on connect due to recursion limit being reached. I have a theory as to what is going wrong but I wanted to query the list about an assumption that I've glossed over at this point. When a view_ method is called in a cacheable and the return value is a graph of interconnected … [View More]

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[Twisted-Python] pyramid -> Ubuntu
by Christopher Armstrong Nov. 4, 2005

Nov. 4, 2005

Wouldn't it be awesome if Pyramid ran on Ubuntu instead of a not-even-latest release of Debian? I've heard rumors it should be as simple as s/woody/breezy/ and a dist-upgrade. We could do that and have jafo standing by in case the machine becomes unbootable after the kernel upgrade. This thought came to me after I was considering and loathing the prospect of upgrading our roundup instance on such an ancient platform. Thoughts? -- Twisted | Christopher Armstrong: International Man of … [View More]

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