Mailman 3 February 2006 - Twisted

[Twisted-Python] Writing a wrapper from asynchronous to synchronous
by Uwe C. Schroeder 28 Feb '06

28 Feb '06

Hi everyone, I know someone is going to say it's a flaw in the design - and I partially agree with that. However I have an application that allows a fairly unexperienced programmer to add modules. What I need to do is to write a wrapper that hides the asynchronous nature of pb (well, Twisted that is, but I'm only using pb), simply because most programmers at the potential customers don't have any knowledge about asynchonous programming. The API for the modules should hide all communications to the server side. So my question would be, is there a way to write some kind of wrapper that will make the caller wait for the deferred callback to be invoked? I have one specific method that just has a flag which is set to true in the deferred callaback which then in turn triggers the action required. So basically it's a recursive method that get's called via a reactor.callLater and if the flag is true calls whatever is needed. The point is to suspend execution of a certain method until some prerequisite initializations are finished. I'd like to do that in an as convenient way as possible. So it's like: 1) module calls some method #1 2) #1 depends on certain initializations to finish 3) the call to #1 doesn't return unless step 2) is done any smart idea's how to wrap that up? Any hints are highly appreciated UC -- Open Source Solutions 4U, LLC 1618 Kelly St Phone: +1 707 568 3056 Santa Rosa, CA 95401 Cell: +1 650 302 2405 United States Fax: +1 707 568 6416

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[Twisted-Python] twisted.protocols.loopback.loopbackTCP(UNIX) is broken
by Jonathan Lange 27 Feb '06

27 Feb '06

Hi, loopbackTCP and loopbackUNIX both use spinWhile and spinUntil, which makes them broken. It appears that they were always meant to block. Why is this? Can we get rid of them? jml

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Re: [Twisted-Python] Writing a wrapper from asynchronous to synchronous
by Lenny G Arbage 26 Feb '06

26 Feb '06

I'm going to refrain from passing judgement, and just ask, isn't this what deferredResult() is all about (http://twistedmatrix.com/documents/current/api/twisted.trial.util.html#defe… Lenny __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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[Twisted-Python] Weekly Bug Summary
by James Y Knight 22 Feb '06

22 Feb '06

Bug summary ______________________ Since 2006-02-15 06:00:02.450000: Bugs opened: 14 Bugs closed: 8 Total open bugs: 562 (+6) Urgent: 4 (+2) Bug: 269 (+0) Feature: 192 (+2) Wish: 97 (+2) New / Reopened Bugs ______________________ ==== Urgent ==== quick command-line way to run web2 server (yesterday) http://twistedmatrix.com/bugs/issue1497 opened by glyph Memory leak using example web server? (2 days ago) CLOSED http://twistedmatrix.com/bugs/issue1494 opened by chileverde [WEB] Memory leak using minimal web server? (2 days ago) http://twistedmatrix.com/bugs/issue1495 opened by chileverde ==== Bug ==== testCyclicAliases in t.mail.test_mail is weird (14 months ago) CLOSED http://twistedmatrix.com/bugs/issue810 opened by marienz [WEB2] doStart missing, reactor.listenTCP. debian unstable twisted, (yesterday) http://twistedmatrix.com/bugs/issue1496 opened by illume [WEB] static File web module doesn't support byte ranges (3 days ago) http://twistedmatrix.com/bugs/issue1493 opened by jmg [WORDS] words error .. (5 days ago) CLOSED http://twistedmatrix.com/bugs/issue1491 opened by jeeterm [WEB] twisted.web.error.ErrorPage does not set Content-Type (4 days ago) CLOSED http://twistedmatrix.com/bugs/issue1492 opened by exarkun ==== Feature ==== Make twistd a library (8 hours ago) http://twistedmatrix.com/bugs/issue1501 opened by radix [CORE] Pluggable application loaders for twistd (5 days ago) http://twistedmatrix.com/bugs/issue1490 opened by itamarst ==== Wish ==== [CORE, WIN32] iocpreactor/udp.py:121 says 1234 when it could say ERROR_PORT_UNREACHABLE (yesterday) http://twistedmatrix.com/bugs/issue1500 opened by ghazel iocpreactor/udp.py:121 says 1234 when it could say ERROR_PORT_UNREACHABLE (yesterday) CLOSED http://twistedmatrix.com/bugs/issue1499 opened by ghazel iocpreactor/udp.py:121 says 1234 when it could say ERROR_PORT_UNREACHABLE (yesterday) CLOSED http://twistedmatrix.com/bugs/issue1498 opened by ghazel [DOCUMENTATION] Shuldn't an interface go with the protocol ? (6 days ago) http://twistedmatrix.com/bugs/issue1489 opened by pupeno Bugs Closed ______________________ ==== Urgent ==== Memory leak using example web server? (2 days ago) http://twistedmatrix.com/bugs/issue1494 opened by chileverde, closed by spiv ==== Bug ==== testCyclicAliases in t.mail.test_mail is weird (14 months ago) http://twistedmatrix.com/bugs/issue810 opened by marienz, closed by exarkun [WORDS] words error .. (5 days ago) http://twistedmatrix.com/bugs/issue1491 opened by jeeterm, closed by ralphm [WEB] twisted.web.error.ErrorPage does not set Content-Type (4 days ago) http://twistedmatrix.com/bugs/issue1492 opened by exarkun, closed by exarkun [CORE] t.i.stdin is horribly broken. (18 months ago) http://twistedmatrix.com/bugs/issue680 opened by jknight, closed by jknight Make the WebSite repository work again (1 week ago) http://twistedmatrix.com/bugs/issue1480 opened by radix, closed by exarkun ==== Wish ==== iocpreactor/udp.py:121 says 1234 when it could say ERROR_PORT_UNREACHABLE (yesterday) http://twistedmatrix.com/bugs/issue1499 opened by ghazel, closed by ghazel iocpreactor/udp.py:121 says 1234 when it could say ERROR_PORT_UNREACHABLE (yesterday) http://twistedmatrix.com/bugs/issue1498 opened by ghazel, closed by ghazel

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[Twisted-Python] Re: [Twisted-commits] r15988 - Fix silly bug that made twscgi not work at all.
by Itamar Shtull-Trauring 21 Feb '06

21 Feb '06

On Mon, 2006-02-20 at 17:04 -0700, James Knight wrote: > Author: foom > Date: Mon Feb 20 17:04:31 2006 > New Revision: 15988 > > Modified: > trunk/twisted/web2/twscgi.py > Log: > Fix silly bug that made twscgi not work at all. Did the tests catch this?

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[Twisted-Python] RE: v2006-2-12 ImportError: IAddress
by Iap, Singuan 19 Feb '06

19 Feb '06

OK, I answer myself. I should use "from twisted.protocols import http" instead of "from twisted.internet import http". Excuse me for the bothering. Iap -----Original Message----- From: Iap, Singuan [mailto:iap_yeh@thecus.com] Sent: Sunday, February 19, 2006 4:39 PM To: 'Twisted general discussion' Subject: v2006-2-12 ImportError: IAddress Hi, I have no idea if this is a bug? Just download 2006-2-12 and my existed script complains the ImportError of IAddress. (twisted.internet.interfaces) Any hints? Iap

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[Twisted-Python] calling reactor.run() twice in PB app
by Eric Smith 19 Feb '06

19 Feb '06

I have a non-authenticating, single-threaded, Perspective Broker application. I'm running Python 2.3, Twisted 2.0.1 on Fedora Core 2. I want to run the reactor multiple times, serially. Essentially I have an existing program, and I want to make some PB calls to get some data. The existing program isn't twisted-aware, nor do I want it to be. I just want them to do what's needed to contact a PB server, get some data, and disconnect. To demonstrate the problem, I took the PB code from chapter 5 of the O'Reilly twisted book (pb_client.py and pb_server.py). In pb_client.py, I duplicated the last 3 lines so now it says: ------------------ t = PbTester() t.runTests() reactor.run() t = PbTester() t.runTests() reactor.run() ------------------ The code runs twice, but the second call to reactor.run() never returns because the getRootObject() deferred never gets called. If I wait long enough, I get a timeout. While the client is hung, I can connect to the same server with another client, and it works normally (at least until the second reactor.run() call). The server seems to be perfectly fine, and keeps responding. CPU usage on the box is normal. Is there something I need to do to run the reactor twice? I've tried changing to Unix domain sockets, but other than not getting a timeout, I get the same behavior. Any hints or debugging tips would be appreciated. Thanks. Eric.

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[Twisted-Python] Weekly Bug Summary
by James Y Knight 15 Feb '06

15 Feb '06

Bug summary ______________________ Since 2006-02-08 06:00:02: Bugs opened: 15 Bugs closed: 12 Total open bugs: 556 (+3) Urgent: 2 (-1) Bug: 269 (+1) Feature: 190 (+2) Wish: 95 (+1) New / Reopened Bugs ______________________ ==== Urgent ==== [CONCH] AttributeError: 'NoneType' object has no attribute 'connectionLost' (yesterday) http://twistedmatrix.com/bugs/issue1486 opened by miro ==== Bug ==== [CORE] Process support sometimes consumes 100% CPU on Linux 2.4.27 (yesterday) http://twistedmatrix.com/bugs/issue1488 opened by exarkun tearDown errors reported strangely (yesterday) CLOSED http://twistedmatrix.com/bugs/issue1483 opened by radix [CORE] Calling reactor.stop() in shutdown function causes hard-to-understand error message (yesterday) http://twistedmatrix.com/bugs/issue1485 opened by itamarst [DOCUMENTATION, WORDS] small bug in twisted irc (yesterday) CLOSED http://twistedmatrix.com/bugs/issue1484 opened by inhahe Make the WebSite repository work again (2 days ago) http://twistedmatrix.com/bugs/issue1480 opened by radix make setup.py and admin/sumo-setup.py share code (2 days ago) http://twistedmatrix.com/bugs/issue1479 opened by radix [CORE, WIN32] IReactorProcess and IProcessTransport are wrong (3 days ago) http://twistedmatrix.com/bugs/issue1478 opened by exarkun [DOCUMENTATION, WEBSITE] SEO: Google searches for docs usually go to out-of-date sourceforge (2 days ago) http://twistedmatrix.com/bugs/issue1481 opened by moonfallen ==== Feature ==== [WEB2] [PATCH] add RedirectResource (2 days ago) http://twistedmatrix.com/bugs/issue1482 opened by andrea Split the path-manipulation stuff in FilePath out to a separate class (4 days ago) http://twistedmatrix.com/bugs/issue1477 opened by radix [WEB] [PATCH] Support for Basic Authentication in t.w.xmlrpc (6 days ago) http://twistedmatrix.com/bugs/issue1474 opened by oubiwann ==== Wish ==== Make LoopingCall deal with deferred returning callables (yesterday) http://twistedmatrix.com/bugs/issue1487 opened by ralphm [CORE] Consolidate and clean up server side HTTP-AUTH implementations (6 days ago) http://twistedmatrix.com/bugs/issue1475 opened by dreid [CORE, WEB2] Include web2 in main Twisted release (6 days ago) http://twistedmatrix.com/bugs/issue1476 opened by andrea Bugs Closed ______________________ ==== Urgent ==== [CORE] Running 'setup.py all install' inside TwistedSumo-2005-11-06 fails to install subprojects (1 month ago) http://twistedmatrix.com/bugs/issue1418 opened by bdash, closed by radix [TRIAL, WIN32] trial hangs indefinitely on win32er (3 weeks ago) http://twistedmatrix.com/bugs/issue1449 opened by exarkun, closed by radix ==== Bug ==== tearDown errors reported strangely (yesterday) http://twistedmatrix.com/bugs/issue1483 opened by radix, closed by jml [DOCUMENTATION, WORDS] small bug in twisted irc (yesterday) http://twistedmatrix.com/bugs/issue1484 opened by inhahe, closed by exarkun [PATCH] gthreadless.py (6 months ago) http://twistedmatrix.com/bugs/issue1129 opened by stefanomasini, closed by radix [CORE, TESTS] twisted.test.test_task calls reactor.iterate() (4 months ago) http://twistedmatrix.com/bugs/issue1198 opened by exarkun, closed by exarkun [TRIAL] .timeout is not enforced for Deferred-chain test cases (2 weeks ago) http://twistedmatrix.com/bugs/issue1456 opened by warner, closed by jml fix twisted.web2 log format to comply with apache (1 week ago) http://twistedmatrix.com/bugs/issue1469 opened by andrea, closed by dreid fix exception in twisted.web2 makeUnsatisfiable (1 week ago) http://twistedmatrix.com/bugs/issue1465 opened by andrea, closed by dreid ==== Feature ==== [RELEASE MANAGEMENT] document Sumo building (3 months ago) http://twistedmatrix.com/bugs/issue1318 opened by radix, closed by radix ==== Wish ==== [TRIAL] Steal features from datatest for trial (23 months ago) http://twistedmatrix.com/bugs/issue529 opened by itamarst, closed by jml RFE: Use zipfile to load plugins.tml from zips on sys.path (31 months ago) http://twistedmatrix.com/bugs/issue47 opened by radix, closed by radix

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[Twisted-Python] Sqlalchemy + Twisted Ideas
by Ed Suominen 15 Feb '06

15 Feb '06

I am a new but very enthusiastic user of sqlalchemy and have been happily banging out some code to use it. Like Valentino Volonghi (but by no means in the same league), I am also a big fan of Twisted and want to integrate my use of sqlalchemy into Twisted apps. Before I get too deep into unit testing (yes, I wrote the code first, shame on me), I'd like to get some feedback from both sqlalchemy and twisted users about what they think of the approach in my module database.py, which I have posted to http://edsuom.pastebin.com/555036. A use case, for my persistent graph package that's going to rely on all this, is posted to http://edsuom.pastebin.com/555040. Note how some database operations are simply encapsulated into a self.transact() call while others, involving several lines of code, are put into a local function and encapsulated into a self.transact(thisTransaction) call at the end of the method. Some assorted coolness: * You can use Twisted's deferred result mechanism or block, even on a case-by-case basis. * Engines are defined at the class level, for all tables and contexts. Tables are defined, also at the class level, for all contexts. Cached selects are defined, however, on a context-by-context basis. * In all three cases, thread-local storage permits even cranky databases like sqlite from complaining about connection objects created in one thread being used in a different thread. * Overridden attribute access is used to construct, or retrieve from cache, the needed goodies on the fly. Advantageously, those goodies are constructed in the context not only of the current Table (in the case of cached select() objects) but also in the current thread. Comments welcome -- positive, critical, or utterly disdainful! - Ed Suominen

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[Twisted-Python] What can be pickled in the PB?
by Timmy 11 Feb '06

11 Feb '06

Hello, I'm new to twisted PB. I would like to know what can be pickled in PB. Can 'file' and 'binary data' be pickled? I'm writing a program to send data (including binary data) to a database via RPC in the server. So I need to know whether PB can do it or not. Thanks!

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