November 2000 - Zope-Dev

More updates on documentation documentation
by Michel Pelletier 06 Nov '00

06 Nov '00

I've added more updates on documentation and worked in the comments recieved from Shane. To help you help us, I added some text on where we need the most attention, check the CurrentIssues for more info. http://dev.zope.org/Wikis/DevSite/Projects/DocumentationProcess/FrontPage This process will define how we create documentation at Digital Creations, and will have far-reaching effects on how each of us contributes, maintains, and understands documentation. So far, Amos and I have proposed a prototype documentation process for synthesis, authoring, editing, reviewing, delivering, and maintaining documentation based on our experiences writing the Zope Book. We have tried hard to be as realistic as possibly in defining a very workable process, but our experience is obviously limited to one artifact, and the pain of living with no real process to date. We would really like to hear what you all have to say about our proposal and our prototype. If you think our prototype has holes in it, please leave your comments in the wiki and we will take them very seriously. We would like to hear comments from: The PythonLabs folks, since they have lots of experience authoring, maintaining and delivering extremely useful documentation. The ZDP folks, who represent the segment of the community most interested in documenting Zope. The DC geeks, since this process will effect, fundamentally, how we all do our jobs. The community developers, since they represent an audience for whom we have little documentation, and where we will focusing much of our upcomming efforts. The community users, since they represent the need for the highest clarity, best documentation, and because they represent the majority audience. In other words, we want to hear from you all! Our goal is to make documentation one of Zope's best features, so let us know how you think we can do that! Thanks, -Michel

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LoginManager & Acquisition Problem
by Charlie Wilkinson 06 Nov '00

06 Nov '00

Greetings Fellow ZoPeople, I'm having some difficulty with Acquisition of security settings within LoginManager protected folders. I'm using the latest CVS of Zope and LM 0.8.8b1 with the included ZPatterns and Plugins. It was necessary to apply a patch (from Luca Mearelli on this list) on HTTPRequest.py to actually create the LM folder without raising a NameError exception on 'path.' I previously worked all the wrinkles out of my UserSource, etc., under Zope 2.1.2., so my difficulties in this case are purely upgrade related. Folders/Objects thusly: / (Root Folder) test (Test Folder) acl_users (LoginManager) index_html (Test Page) If I change the security settings on index_html to allow access from a test account role, all works fine. If however, I change the security settings on the test folder instead of index_html, it does not have the expected effect and I get the forbiddenpage, as if acquisition of these settings were not working. I did not turn off "Acquire Settings" on index_html. Pretty much all such settings have been left at the default settings except for adding the new roles to the test folder and enabling them in either the test folder or on the index_html object as indicated. As with may other things Zope & Python, I don't understand yet how LM interacts with the mechanics of acquistion and security settings. Has anyone else tackled this yet who could provide some insights and/or a fix? Thanks in advance, Charlie -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Charlie Wilkinson - cwilkins(a)boinklabs.com - N3HAZ Parental Unit, UNIX Admin, Homebrewer, Cat Lover, Spam Fighter, HAM, SWLer... Visit the Radio For Peace International Website: http://www.rfpi.org/ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ CLOBBER INTERNET SPAM: See!! <http://spam.abuse.net/> Join!! <http://www.cauce.org/> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ QOTD: "Bush is a big corporation disguised as a human being running for president." -- Ralph Nader on David Letterman (9/28/00)

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[ANN] Zope 2.2 patch for cDocumentTemplate/Acquisition bug
by Dieter Maurer 05 Nov '00

05 Nov '00

Appended is a patch for the cDocumentTemplate/Acquisition bug. Usually, this bug manifests itself by an "AttributeError: __call__" for a folder object. The usual context is: DTML Document: ..... <dtml-with folder>  .... </dtml-with> ..... The patch modifies "C" code. This means you need a Zope source distribution to apply it and then you must regenerate Zope. Almost surely, the patch is not yet complete: The code in "cDocumentTemplate.c" looks like (Python emulating "C" code): if callable(o): if hasattr('isDocTemp') and o.isDocTemp: o= o(None,md) else: o= o() The remaining problem is that 'isDocTemp' might be acquired and does not belong to "o.__call__". In this case, "o" might be called with the wrong number of parameters. I would expect, that the problem disappears, when the "isDocTemp" test is performed with "o.aq_base" rather than "o". But I am not sure. Maybe, an acquisition expert can look into this remaining issue. Dieter ------------------------------------------------------------------------ --- lib/Components/ExtensionClass/:Acquisition.c Sat Oct 7 20:40:53 2000 +++ lib/Components/ExtensionClass/Acquisition.c Sat Nov 4 21:10:04 2000 @@ -1391,6 +1391,31 @@ return r; } + +/* DM: adding "AqCallable_Check" */ +static int +aqCallable(PyObject *o) { + if (isWrapper(o)) { + PyObject *call; + + UNLESS(call=PyObject_GetAttr(o,py__call__)) { + PyErr_Clear(); + return 0; + } + Py_DECREF(call); return 1; + } else + return PyCallable_Check(o); +} + +static PyObject * +AqCallable_Check(PyObject *ignored, PyObject *args) +{ + PyObject *o; + + UNLESS (PyArg_ParseTuple(args, "O", &o)) return NULL; + return PyInt_FromLong((long) aqCallable(o)); +} + static struct PyMethodDef methods[] = { {"aq_acquire", (PyCFunction)module_aq_acquire, METH_VARARGS|METH_KEYWORDS, "aq_acquire(ob, name [, filter, extra, explicit]) -- " @@ -1412,6 +1437,10 @@ {"aq_chain", (PyCFunction)module_aq_chain, METH_VARARGS, "aq_chain(ob [, containment]) -- " "Get a list of objects in the acquisition environment"}, + /* DM */ + {"callable", (PyCFunction)AqCallable_Check, METH_VARARGS, + "callable(ob) -- " + "return true iff the object is callable"}, {NULL, NULL} }; --- lib/python/DocumentTemplate/:cDocumentTemplate.c Sat Jul 29 11:24:34 2000 +++ lib/python/DocumentTemplate/cDocumentTemplate.c Sat Nov 4 21:11:11 2000 @@ -95,14 +95,35 @@ static PyObject *py_Unauthorized_fmt, *py_validate; static PyObject *py__push, *py__pop, *py_aq_base; -/* ----------------------------------------------------- */ - static void PyVar_Assign(PyObject **v, PyObject *e) { Py_XDECREF(*v); *v=e;} #define ASSIGN(V,E) PyVar_Assign(&(V),(E)) #define UNLESS(E) if (!(E)) #define UNLESS_ASSIGN(V,E) ASSIGN(V,E); UNLESS(V) #define OBJECT(O)(((PyObject*)O)) +/* ----------------------------------------------------- */ +/* DM: callable */ +static int (*callable)(PyObject *o); + +static PyObject *aq_callable; + +static int aq_callable_check(PyObject *o) { + PyObject *result= PyObject_CallFunction(aq_callable,"O",o); + int callable= PyInt_AsLong(result); + Py_DECREF(result); + return callable; +} + +static void init_callable() { + PyObject *aq= PyImport_ImportModule("Acquisition"); + if(aq && + (aq_callable= PyObject_GetAttrString(aq,"callable"))) + callable= aq_callable_check; + else callable= PyCallable_Check; +} + +/* ----------------------------------------------------- */ + typedef struct { PyObject_HEAD PyObject *inst; @@ -370,7 +391,7 @@ { dt=0; - if (PyCallable_Check(e)) + if ((*callable)(e)) { /* Decide whether we have a document template */ if (rr=PyObject_GetAttr(e,py_isDocTemp)) @@ -917,6 +938,9 @@ PyDict_SetItemString(d, "__version__", PyString_FromStringAndSize(rev+11,strlen(rev+11)-2)); + + /* DM */ + init_callable(); if (PyErr_Occurred()) Py_FatalError("can't initialize module cDocumentTemplate");

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Re: [Zope] Question about dtml-in
by Dieter Maurer 05 Nov '00

05 Nov '00

Sean McGrath writes: > ... "dtml-in" treats sequences of two element tuples specially ... You are right. This is to support the frequent case of iterating over item sequences. There should be a "dtml-in" argument to switch off this special treatment. If I had your problem, I would go for such a solution (extending "dtml-in"). It should be easier than to work around the special treatment in DTML and it would help the Zope community as a whole. If you do not want to go this way, I would suggest to put a feature request into the Collector. Dieter

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Re: [Zope-dev] ZCLass help
by Dieter Maurer 05 Nov '00

05 Nov '00

Veiko Schnabel writes: > .... > i created a new Product calles book > with propertys writer(string), pages(int) > and a standart method called index_html to output all these > probertys .... > .... instance "my_book" .... > <dtml-var my_book> > .... > all i get is the id of the instance my_book > <PubClass instance at 8ab30c8> The ZPublisher (i.e. when you access your instance with the internet) automatically activates "index_html" (if the object is not callable). "dtml-var" does not. Instead, it calls the object, if it is callable (not the case in your example), and then converts to a string. You can use: <dtml-with my_book> <dtml-var index_html> </dtml-with> Dieter

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Re: [Zope-dev] another debugging howto, and a question
by Dieter Maurer 05 Nov '00

05 Nov '00

Simon Michael writes: > Here are some draft howto-like things some might find helpful > (improvements welcome) : > > http://zwiki.org/ZopeDebuggingRoadmap > http://zwiki.org/HowToDebugZopeInEmacs > > and a burning question: > > how can I invoke zserver such that I will get the interactive debug > prompt ? I'd like to have my breakpoints trigger when I access the > server in the normal way with a web browser, poke around, let it run > on and do it again. I was able to do this in the past and it's useful. Maybe, the monitor is what you need. In a monitor session, you can import pdb. However, as Zope is multi-threaded, pdb interaction might seriously affect the other threads. To put it another way: I am not sure, whether pdb is thread safe. Dieter

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python memory error on Windows NT
by James Johnson 04 Nov '00

04 Nov '00

Error messages are wonderful things aren't they? If you notice other quirky/unexplained behavior with the machine, it could be a RAM problem. You say you have 2 ODBC connections and 2 Access databases. Are they located on the same machine or across a LAN? One hunch is that the problem is that because of network traffic, complex queries, proxy access. Some kind of delay however slight could be causing the ODBC software to fail. The RAM does seem suspect and some other process on your machine could be set to aggressively take RAM space. I would look into the way Zodbc handles network latency and error conditions between 2 or more ODBC databases. I wonder from what I just suggested would it be possible to get this error from Zodbc? python.exe >The instruction at "0x1b271a1f" >referenced memory at "0x00000000" >The memory could not be "read" Get your Free E-mail at http://tacoma.zzn.com ____________________________________________________________ Get your own Web-Based E-mail Service at http://www.zzn.com

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Re: Zope-Dev digest, Vol 1 #785 - 21 msgs
by Colin Leath 04 Nov '00

04 Nov '00

I get that error (replace "python.exe" with the program that just crashed) somewhat often on my NT Server box at work. I notice it most often when using Excel, or when working in Installshield. I assume one of my memory chips has a problem... If you find a different solution, please let me know. Colin cleath(a)experienceartist.org Message: 20 From: "Coi Giovanni" <coi.giovanni(a)prometeo.it> Organization: Prometeo srl To: Toby Dickenson <mbel44(a)dial.pipex.net>, tdickenson(a)geminidataloggers.com Date: Fri, 3 Nov 2000 17:10:23 +0100 Subject: Re: [Zope-dev] python memory error on Windows NT Reply-to: coi(a)prometeo.it CC: zope-dev(a)zope.org In data 3 Nov 2000, alle ore 11:22, Toby Dickenson ha scritto: > >someone has never seen this kind of error on Windows NT > >4.0 (last patch update) while executing IIS 4.0 + Zope 2.2.2? > >The panel say: > > > >python.exe > >The instruction at "0x1b271a1f" > >referenced memory at "0x00000000" > >The memory could not be "read" >

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Re: [Zope] pluggable brains
by Philipp Auersperg 04 Nov '00

04 Nov '00

With that I can implement some business logic for the merchant objects in an object oriented manner, so these objects know how to handle themselves. read the article in (http://www.zope.org/Members/michel/ZB/RelationalDatabases.html) about object-relational binding, there you find some more detailed descriptions but I think it is still a little bit underdocumented... BTW in meanwhile I've found the answer to my question below: you can just bind ZClasses to a SQL method that are not marked as persistent. phil *********** REPLY SEPARATOR *********** On 03.11.2000 at 14:11 MANUEL JOSE AMADOR BRIZ wrote: >What is this ZClass binding for? What\'s its purpose? > >Quoting Philipp Auersperg <zope(a)philosoft.at>: > >> For ZSQL Methods it is possible to bind a ZClass to the records. >> >> These can be selected from te combo box labeled \'ZClass\' in the >> \'advanced\' tab of the SQLMethod\'s management screen, >> but there is always listed just one ZClass. >> >> My question: >> Why is there just one ZClass selectable, even if there are many ZClasses >> defined? >> Is that a bug or a feature? >> >> thanks >> >> phil >> >> > >---------------------------------------------------------- > Universidad Federico Santa Maria - Campus Guayaquil > Enviado por: www.usm.edu.ec

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2gb file size
by Andy McKay 04 Nov '00

04 Nov '00

My database has suddenly ballooned to 2 gig's stopping my Zope from running. Are there any utils to delete the last transaction or so? This is kinda urgent... :( Thanks. -- Andy McKay, Developer. ActiveState.

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