Mailman 3 January 2011 - Twisted

[Twisted-Python] Twisted Python 0.7.0 Prerelease Testing
by Glyph Lefkowitz Aug. 5, 2021

Aug. 5, 2021

hi there, folks: I'd really like to release 0.7.0 but I would like it to be at least a little bit tested before I do so. Could those of you with CVS trees check everything out and see if it performs as advertised? Deeper bugs than that will have to wait for the next release, but I'd at least like to know if it works for someone other than me. Thanks. ______ __ __ _____ _ _ | ____ | \_/ |_____] |_____| |… [View More]

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by Tamika May 1, 2019

May 1, 2019

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[Twisted-Python] regarding xml elements
by Raj kumar Oct. 2, 2013

Oct. 2, 2013

Hi, I have an xml file in my application, I have created an element using Example goes like this......... document.createElement("abc") and i appeneded it by using append() method. But how i can reflect this change to my xml file? and one more thing is i want to create element with some other parameters.... like............. <abc m=" " n=" "> </abc> and i have m and n values as strings with me. can anybody help me to create this element and write it to the existing xml … [View More]

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[Twisted-Python] Get IP of connecting client in XMLRPC server
by Remy C. Cool April 28, 2013

April 28, 2013

Hello, On 18 May 2004, the following message was posted to this mailinglist: Jp Calderone exarkun at divmod.com wrote: >Daniel Newton wrote: > > I have a simple XML-PRC server similar to the example below: > > from twisted.web import xmlrpc, server > > class Example(xmlrpc.XMLRPC): > """An example object to be published.""" > > def xmlrpc_add(self, a, b): > """Return sum of arguments.""" > return a + b def … [View More]

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[Twisted-Python] http.Request and JSON
by Vincent Gulinao Jan. 25, 2012

Jan. 25, 2012

How do you read JSON content from a POST using http.Request. I peeked on args and it's empty. TIA.

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[Twisted-Python] Task-based documentation started
by Tom Davis Feb. 6, 2011

Feb. 6, 2011

I have the beginnings of some task-based documentation available in twisted-docs (https://github.com/tdavis/twisted-docs) now. You can find the built version in the usual place (http://docs.recursivedream.com/twisted/) -- just remember to bust the cache. I chose serving web content as a starting point because it seems as common a task as any. I took some examples from the existing howto ( http://twistedmatrix.com/documents/current/web/howto/using-twistedweb.html), as well as added some … [View More]

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[Twisted-Python] Using SerialPort with t.a.s.Application
by Albert Brandl Feb. 4, 2011

Feb. 4, 2011

Hi! In our project, we accumulate data from various sources. Some of them are connected via serial line (e.g. a GPS receiver and a weather station). I'd like to run the application with twistd. But it looks as if SerialPort does not really fit into this framework. It does not implement IService, so `my_serial_port.setServiceParent(collection)` does not work. Is there any technical reason that SerialPort does not implement IService? Could you suggest a workaround for this problem (other than … [View More]

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[Twisted-Python] Fingering Finger
by Tom Davis Feb. 1, 2011

Feb. 1, 2011

In this thread, I hope to find a resolution to the issue of the Finger tutorial and efforts to sufficiently improve it or remove it. In the course of reviewing documentation-related tickets, I stumbled upon #1148 (http://twistedmatrix.com/trac/ticket/1148). Therein, Glyph first(?) put down a lot of things we've been discussing and agreeing upon in the Refactoring Documentation thread. One of the issues still up for debate is whether or not the Finger tutorial is sufficiently strong to survive … [View More]

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[Twisted-Python] A Python enum library with a Twist
by Jonathan Jacobs Feb. 1, 2011

Feb. 1, 2011

Hi, First off there isn't actually a twist, it's just for Twisted addressing the points in #4671 [1]. Sorry to disappoint. Secondly I realise there are already at least a thousand Python enum libraries, most of which I haven't explored, feel free to mention these with supporting arguments. My point of view is that a great many number of these enum libraries go to long lengths to make stuff too "cute". While having less not-networking-related code in Twisted may be a more desirable route, … [View More]Twisted makes enough use of enum-esque things in the current code base that it may be easier (maybe even warranted) to have our own implementation that can cater directly to the needs of Twisted without being subjected to the usual irritations of third-party software; also Twisted's high-qualilty coding and testing standards are only a good thing. The current code is hosted on Launchpad [2] and the source code is viewable on the web [3]. I am aware that there are currently no unittests or any kind of useful documentation, hopefully the examples are good enough for now. I'm hoping for some feedback to decide whether to press ahead or turn back. I've tried to look at as many Twisted enum use-cases as possible, without trying to cater to every one individually, however I do still have a few questions: 1. #4671 uses an "asInt" method in the examples, this is obviously going to require changing all code that uses these enums (of which there is plenty.) Is this a good idea? It seems easy to forget that "F_FOO | F_BAR" is not giving you a number. 2. I use "__int__", I don't know if this is horrible or not and whether I should just use the "asInt" method proposed in the ticket. 3. It seems to me that there are two general cases: 1. The enum just holds values that have an interesting meaning on their own (e.g. AMP special keys (ASK, ANSWER, etc.), IRC status codes (RPL_WHOIS, etc.)) and combining them makes no sense. 2. The enum holds values that are intended to be combined. i.e. flags. Does it make sense to try and combine this behaviour into the same type? Currently it is and you get an exception when doing certain things (none of which make any sense, in this context): >>> (Words.AYE | Words.BEE) <EnumValueGroup '|': [<EnumValue Words.AYE: 'a'>, <EnumValue Words.BEE: 'b'>]> >>> (Words.AYE | Words.BEE).value Traceback (most recent call last): File "<stdin>", line 1, in <module> File "enum.py", line 77, in value return reduce(self.op, values) TypeError: unsupported operand type(s) for |: 'str' and 'str' >>> Words.fromValue('a') <EnumValue Words.AYE: 'a'> >>> Words.fromValue('c') # This value is not in the enumeration and ORing values to get it is impossible. Traceback (most recent call last): File "<stdin>", line 1, in <module> File "enum.py", line 133, in fromValue if target - v < 0: TypeError: unsupported operand type(s) for -: 'str' and 'str' Comments appreciated. [1] <http://twistedmatrix.com/trac/ticket/4671> [2] <http://code.launchpad.net/~jjacobs/+junk/twistedenum> [3] <http://bazaar.launchpad.net/~jjacobs/+junk/twistedenum/view/head:/enum.py> -- Jonathan [View Less]

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com Jan. 30, 2011

Jan. 30, 2011

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[Twisted-Python] HTTPClient handling LF only servers
by Jason J. W. Williams Jan. 26, 2011

Jan. 26, 2011

Hi Y'all, Certain servers (notably Hacker News) break HTTPClient because they use LF instead of CRLF to terminate header lines. I've uploaded a patch with tests to ticket 4814 (merged into ticket 2842). I'd appreciate a review and some discussion about integrating it. -J Sent via iPhone Is your e-mail Premiere?

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[Twisted-Python] Names DNS Client too chatty
by Jason J. W. Williams Jan. 25, 2011

Jan. 25, 2011

Hi Guys, I'd like to get ticket 4021 integrated in some fashion into Twisted. Currently, the Twisted Names client issues a "starting" and "stopping" log message on every resolution. It fills up the logs and makes seeing valuable log messages really difficult in the sea of DNS requests. 150,000 resolutions per day is generating 700mb of logs just from the start/stop. The problem is actually the UDP datagram transport that Resolver is based on. 4021 proposes to address the issue by wrapping … [View More]

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[Twisted-Python] Porting twisted methods to a synchronous environment
by Don Dwiggins Jan. 25, 2011

Jan. 25, 2011

I have a server that provides access to a database in the usual way, using adbapi to talk to an MSSQL server. Now, I'm facing the need to create an application that can access the server directly. (In addition to, not instead of.) In the spirit of "write it once", I'd like to be able to "import" the server's database read/write methods into a module in the application, possibly driven by a reactor of some sort. In this case, there'd be no client/server protocol, just calls from other … [View More]

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com Jan. 24, 2011

Jan. 24, 2011

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[Twisted-Python] Refactoring Documentation
by Tom Davis Jan. 24, 2011

Jan. 24, 2011

I've been using (and threatening to work on) Twisted for a few years now. It seems like every time I get back into it, I need to dig up old code or Google queries just to get started. Yesterday, Jean-Paul introduced me to the trial-tutorial branch<http://twistedmatrix.com/trac/browser/branches/trial-tutorial-2443-2> which has shed some light on the basics of using trial and testing Twisted client/server applications in general. Until he mentioned it in IRC, I was stuck looking at the … [View More]actual tests for protocols and deciding which parts of that were generically useful to me. I agreed to finish up that documentation so that it could finally (four years later) be added to trunk (and more importantly, twistedmatrix.com). But after thinking about it, I believe the problem runs much deeper than just the lack of a branch merge. Reading code to find answers isn't rocket science; I've been programming long enough to be comfortable doing it. But I probably have to resort to reading Twisted's code about 8 billion percent more often than any other codebase. And reading code is a hurdle. Reading through Twisted's semi-random, 45-point FAQ is a hurdle—and recommending it as a starting point is unhelpful at best. The core documentation isn't awesome either, given that it has a tendency to be overly cryptic and link to API documentation that is often incomplete or generally unhelpful. As one very basic example, see: http://twistedmatrix.com/documents/current/core/howto/servers.html. Let's just review a few things wrong with this page: - It's tutorial page #1, but basically tells me I need to read howto/plugins.html first if I am writing an "application" (whatever that is), as opposed to a "TCP, SSL, and Unix socket server". And it's the wrong place for UDP. - It attempts to introduce Protocols and Factories—two of Twisted's most important concepts—and does neither particularly well. I know that Protocols (usually) inherit from t.i.p.Protocol and may be instantiated for a variety of reasons and aren't (usually) persistent. I also know that Factories instantiate Protocols and give a reference to themselves so protocols can "access and modify the persistent configuration". I am told I need to implement some interface (or something) to actually listen on a host/port. I think. - At one point "TCP4ServerEndpoint" is instantiated (but never imported); its explanation is left to a digression into the endpoints API, which has its own issues. Suffice it to say the document doesn't give me sufficient reason to actually use the endpoints API. - Later on, we just use reactor.listenTCP()—which our previous digression (if bothered to click through and read) claims is not preferable. By the end of the *servers* tutorial (and after reading some linked documentation), here's all I *really* know: 1. Factories create protocols somehow 2. Protocols have methods like connectionMade, connectionLost, and dataReceived to handle events 3. There are other protocols with other methods. One that I know of, anyway. 4. I may need to write a state machine (???) 5. I should use an Endpoint or maybe a Service or reactor (but probably not!) 6. I should also use Application for serious business Moving forward, howto/clients.html duplicates a lot of these things and fills in some gaps in knowledge while creating more holes. Meanwhile, I still never wanted to create a QOTD or Echo server. I think the point has been made. My *real* point, though, is that I love Twisted. And I'm constantly wishing it was more accessible to newcomers. Twisted is Python's oldest and most mature event-based networking engine and despite its decade of existence it remains largely confusing and obscure to the majority of Python programmers who come upon it. It contains concepts and standards that are alien to the average Python programmer, but they make a lot of sense and have a lot more consistency and predictability than the documentation conveys. I want to fix that, among other things. And as luck may have it, I like writing documentation. And I know at least enough Twisted to get the high-level stuff in order and improve the documentation to the point that people will keep reading long enough to make sense of the "idea of Twisted" and be able to implement some basic things and expand upon them later. There are some things I *do* want to accomplish early on: - Make the docs accessible (a lot is hidden and hard to find) - Make them more concise and useful to somebody who doesn't want to know the 50 different ways to skin every cat (including the ones you should never use) - Make them introduce and explain Twisted in a way that somebody as dumb as me can understand it. This means talking about protocols, factories, deferreds, etc. in a way that doesn't require thousands of words of circular explanations, digressions, and duplications. - Document the different Twisted projects as what they are: really useful libraries and/or clients/servers built on top of Twisted that just so happens to also ship with the core. One of them is likely to do what the prospective user wants, too. There are also some things I *don't* want to accomplish, at least initially: - Explain asynchronous programming in depth - Get into the level of detail that the Krondo series does (but I plan to borrow from it!) There are things I'll *need help with*: - The final word on what is/isn't to be used in what context; practical, real-world explanations of why I would use A instead of B (not just "it's more flexible"). - Better documentation from project creators/maintainers/lovers on their project. These projects make a lot of hard stuff trivial and many do not convey that very well. I'll do my best to reorganize and improve the existing documentation, but most of the projects cater to a specific niche that requires its own core knowledge. Most of this was discussed with Jean-Paul and Glyph at tonight's Python meet-up in Cambridge. Some work has already begun on the new docs here: https://github.com/tdavis/twisted-docs I hope the above came off as optimistic and constructive as I meant it: it's not my intention to insult the documentation or those who wrote it. I just think with a dose of hindsight and a lot of effort, the docs can be awesome. And they would improve the entire Twisted ecosystem along with them. Cheers, Tom [View Less]

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[Twisted-Python] incomplete reviews
by Glyph Lefkowitz Jan. 24, 2011

Jan. 24, 2011

Some reviewers (you know who you are!) have gotten into the habit of doing incomplete reviews, that note one or two trivial things about a patch or branch, but don't say whether the code is ready to land after fixing just those trivial things. I've updated the review process documentation to address this, so every reviewer, please have a look: <http://twistedmatrix.com/trac/wiki/ReviewProcess?action=diff&version=44>

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[Twisted-Python] Flags with MaildirMailbox
by goffi Jan. 20, 2011

Jan. 20, 2011

G'day everybody, I'm playing a little bit with twisted.mail.maildir.Mailbox which seems to work nice, but it doesn't seem to manage flags (cf http://cr.yp.to/proto/maildir.html "What can I put in info"). Is there an easy/elegant way to do this ? Is it planed to implement this feature ? Thanks for any answer Regards Goffi

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[Twisted-Python] Question about SerialPort
by Albert Brandl Jan. 20, 2011

Jan. 20, 2011

Hi! I am trying to read Modbus RTU messages over the serial line. There is a library called pyModbus which is very usable for Modbus TCP/IP, but the support for RTU is a bit lacking. The main problem seems to be the specification of Modbus RTU. RTU messages are separated by time gaps that are at least 3.5 characters long. Unfortunately, this is the only reliable way for separating messages - there is no length header or something similar. The specification does define a trailing CRC, though. … [View More]

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[Twisted-Python] (conch) credentials.signature always None?
by Saúl Ibarra Corretgé Jan. 20, 2011

Jan. 20, 2011

Hi all, I'm experiencing something weird while writing a simple SSH server, and I wonder if anyone did run into this before: On every snippet I see around regarding public key authentication, the signature is checked as follows: # if not credentials.signature: # return failure.Failure(ValidPublicKey()) # try: # public_key = keys.Key.fromString(data=credentials.blob) # except (keys.BadKeyError, keys.EncryptedKeyError): # return failure.… [View More]

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Re: [Twisted-Python] Boston Area Mini-Sprint
by Tenth Jan. 19, 2011

Jan. 19, 2011

The Mini-Sprint was pretty successful... The seven attendees (and three remote contributors) managed to close 12 tickets, and start work on a several more. The Official Report is here: http://labs.twistedmatrix.com/2011/01/january-twisted-sprint-report.html Hopefully we'll do this again soon! If you weren't on the invitation list for the January sprint but would like to hear about our plans for February, let me know. (I'll post again once we figure out a date.) - Dave

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[Twisted-Python] Design advice
by benjamin.bertrand＠lfv.se Jan. 17, 2011

Jan. 17, 2011

Hi, I'm trying to do a proof of concept and need some advice about the design. We today have an external system sending messages to several of our tests systems (one specific connection per system). We'd like to get our own server for more flexibility (easily setup connection to a new system, filtering, re-sending...). The general idea so far is: - A server receives all the messages from the external system, parses them and writes them to a database. The server will be running as a daemon (… [View More]

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[Twisted-Python] Twisted and ipython
by Alessandro Dentella Jan. 17, 2011

Jan. 17, 2011

Hi, I'm starting a project where I plan to use twisted for the first time. I'd like to practice using ipython and after looking around I found a recepe [1] by Metthew Scott and a comment by Bob Ippolito on that recepe that suggests a different approch [2]. In the ipython manual there's a reference to twisted in the -*thread section, but it's unclear to me what should be the option (-pylab as for matplotlib?): -gthread, -qthread, -q4thread, -wthread, -pylab Only ONE of these … [View More]

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Re: [Twisted-Python] Boston Area Mini-Sprint
by Andrew Francis Jan. 16, 2011

Jan. 16, 2011

Hi Glyph et al: Message: 4 Date: Sat, 15 Jan 2011 15:44:55 -0500 From: Glyph Lefkowitz <glyph(a)twistedmatrix.com> Subject: Re: [Twisted-Python] Boston Area Mini-Sprint To: Twisted general discussion <twisted-python(a)twistedmatrix.com> Message-ID: <D5E13202-730B-4784-A29F-56180FB0A71D(a)twistedmatrix.com> Content-Type: text/plain; charset="us-ascii" >It's being held in somebody's home office in Somerville MA, and it's from >2-9PM EST. I'm excited about it myself, … [View More]

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[Twisted-Python] Weekly Bug Summary
by exarkun＠twistedmatrix.com Jan. 16, 2011

Jan. 16, 2011

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[Twisted-Python] "small" jobs
by Glyph Lefkowitz Jan. 15, 2011

Jan. 15, 2011

Hello Twisted Community, Tomorrow, we're going to have a sprint in Massachusetts, where core developers and several contributors will get together to improve Twisted's code and documentation. If you can't make it there, we'd be happy for you to play along at home, reviewing tickets and submitting patches. We'll be on the twisted IRC channel as usual. However, there are probably many of you who don't quite feel up to a sprint; who might not know enough about Python, or Twisted's internals, … [View More]

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