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Errors in Zope
by Petr Knapek 03 Mar '00

03 Mar '00

Hi all, I would like to know if there is any possibility in Zope to see also the line number of zope rendered object when any error occurs? This would help me (and not only me) during debugging. I think this information could be at the beginning of traceback. If this already exists can you tell me how to show this and if not I would like to know your meaning of this. Petr -- Petr Knápek PVT.NET, e-mail: petr.knapek(a)pvt.net, tel:+420-5-41 558 394 PVT a.s. - pvt.net, Veveří 102, 659 10 Brno, Czech Republic

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Attribute Error - commit_sub
by Adrian Hungate 03 Mar '00

03 Mar '00

I have been trying to set up some user contributed areas on my intranet site, using the webdav support, but I kept getting errors, so I tried uploading using the mgmt interface and I get this for any file that is over about 80k. Error Type: AttributeError Error Value: commit_sub Traceback (innermost last): File G:\SHARED~1\E-INTR~1\lib\python\ZPublisher\Publish.py, line 214, in publish_module File G:\SHARED~1\E-INTR~1\lib\python\ZPublisher\Publish.py, line 179, in publish File G:\SHARED~1\E-INTR~1\lib\python\Zope\__init__.py, line 202, in zpublisher_exception_hook File G:\SHARED~1\E-INTR~1\lib\python\ZPublisher\Publish.py, line 169, in publish File G:\SHARED~1\E-INTR~1\lib\python\ZODB\Transaction.py, line 246, in commit AttributeError: (see above) Does anyone have any idea why/how this is happening? Did I do something wrong? I am running 2.1.4 on NT Adrian...

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Subclassing ExtensionClass in C (this time with a solution)
by James Henstridge 03 Mar '00

03 Mar '00

Last week I asked a question about subclassing ExtensionClasses in C, but no one seemed to know how to do it. I then tried asking Jim Fulton about it, but he hasn't responded yet. So I decided to sit down and try to add the functionality myself. I am posting it here as some people on the list expressed an interest. I have tried to keep to the style of the current code, so those who have used ExtensionClass should be able to do Extension Subclasses in C without too much problem. Also, the modification is backward compatible (both source and binary), so it shouldn't break any current code. The one place where the programmer has to be careful is in making the size and layout of the instance structure of the new class is compatible with its base classes. I didn't include the checks done when subclassing from python, as you may want to have more than one non-pure mixin base class, or to extend the size of the instance structure in the subclass. To define a new Extension Subclass, follow the same steps as for a normal ExtensionClass, but instead of using PyExtensionClass_Export, use PyExtensionClass_ExportSubclass. This new function is similar to PyExtensionClass_Export, except that it takes an extra argument -- a tuple of base classes. The function takes ownership of the tuple. In cases where you only want to do single inheritance, there is a convenience routine called PyExtensionClass_ExportSubclassSingle. Its last argument is the PyExtensionClass structure for the base class. I have also attached a test module called TESC that tests out subclassing in C. Running it gives output something like: >>> import TESC >>> a = TESC.Cls() >>> b = TESC.Subcls() >>> a.m1(), a.m2() ('m1 of Cls called', 'm2 of Cls called') >>> b.m1(), b.m2(), b.m3() ('m1 of Subcls called', 'm2 of Cls called', 'm3 of Subcls called') I have tested this module a fair amount, and it doesn't seem to introduce any problems with existing code, and is a fairly clean modification (I could have made the change a little cleaner, but that would have broken binary compatibility). So I was wondering if my patch could be integrated into the official ExtensionClass distribution. I am sure it is of use to more people than just me. James. -- Email: james(a)daa.com.au WWW: http://www.daa.com.au/~james/ --- ExtensionClass.c.orig Fri Mar 3 09:17:35 2000 +++ ExtensionClass.c Fri Mar 3 12:20:39 2000 @@ -1571,7 +1571,8 @@ fprintf(stderr,"Deallocating %s\n", self->tp_name); #endif Py_XDECREF(self->class_dictionary); - if (self->bases) + /* if this ExtensionClass was subclassed in python, free this info */ + if ((self->class_flags & EXTENSIONCLASS_PYSUBCLASS_FLAG) != 0) { /* If we are a subclass, then we strduped our name */ free(self->tp_name); @@ -1580,9 +1581,8 @@ if (self->tp_as_number) free(self->tp_as_number); if (self->tp_as_sequence) free(self->tp_as_sequence); if (self->tp_as_mapping) free(self->tp_as_mapping); - - Py_DECREF(self->bases); } + Py_XDECREF(self->bases); if (((PyExtensionClass*)self->ob_type) != self) Py_XDECREF(self->ob_type); PyMem_DEL(self); } @@ -3241,6 +3241,9 @@ #define copy_member(M) self->M=type->M copy_member(ob_size); copy_member(class_flags); + /* mark subclass as a python one, so subclass structures are freed on + * deallocation */ + self->class_flags |= EXTENSIONCLASS_PYSUBCLASS_FLAG; copy_member(tp_itemsize); copy_member(tp_print); @@ -3399,6 +3402,36 @@ return PyMapping_SetItemString(dict,name,(PyObject*)typ); } +/* bases is a tuple of base classes. This function absorbs the reference */ +static int +export_subclassed_type(PyObject *dict, char *name, PyExtensionClass *typ, + PyObject *bases) +{ + initializeBaseExtensionClass(typ); + + if (PyErr_Occurred()) return -1; + + /* set this up as a subclassed ExtensionClass */ + UNLESS (bases && PyTuple_Check(bases) && PyTuple_Size(bases)) { + PyErr_SetString(PyExc_TypeError, + "second argument must be a tuple of 1 or more base classes"); + return -1; + } + typ->bases = bases; + + if (PyDict_GetItem(typ->class_dictionary, py__module__) == NULL) + { + PyObject *modname = PyDict_GetItem(dict, py__name__); + if (modname != NULL) { + if (PyDict_SetItem(typ->class_dictionary, py__module__, modname) < 0) + return -1; + } + } + PyErr_Clear(); + + return PyMapping_SetItemString(dict,name,(PyObject*)typ); +} + static struct ExtensionClassCAPIstruct TrueExtensionClassCAPI = { export_type, @@ -3410,6 +3443,7 @@ (PyObject*)&PMethodType, PMethod_New, CMethod_issubclass, + export_subclassed_type, }; void --- ExtensionClass.h.orig Fri Mar 3 09:17:41 2000 +++ ExtensionClass.h Fri Mar 3 12:13:24 2000 @@ -174,6 +174,7 @@ #define EXTENSIONCLASS_INSTDICT_FLAG 1 << 4 #define EXTENSIONCLASS_NOINSTDICT_FLAG 1 << 5 #define EXTENSIONCLASS_BASICNEW_FLAG 1 << 6 +#define EXTENSIONCLASS_PYSUBCLASS_FLAG 1 << 7 /* The following flags are for use by extension class developers. */ #define EXTENSIONCLASS_USER_FLAG1 1 << 16 @@ -297,6 +298,25 @@ PyCObject_Import("ExtensionClass","CAPI"))) \ { PyExtensionClassCAPI->Export(D,N,&T); } +/* Export an Extension Subclass class in a given module dictionary with a + given name, ExtensionClass structure and set of base classes. It is + up to the programmer to make sure that the instance structures of the + base classes are compatible with that of the new class. + */ +#define PyExtensionClass_ExportSubclass(D,N,T,B) \ + if(PyExtensionClassCAPI || \ + (PyExtensionClassCAPI= (struct ExtensionClassCAPIstruct*) \ + PyCObject_Import("ExtensionClass","CAPI"))) \ + { PyExtensionClassCAPI->ExportSubclass(D,N,&T,B); } + +/* Export an Extension Subclass class in a given module dictionary with a + given name, ExtensionClass structure and single base class. It is up to + the programmer to make sure that the instance structures of the base + classes are compatible with that of the new class. + */ +#define PyExtensionClass_ExportSubclassSingle(D,N,T,B) \ + PyExtensionClass_ExportSubclass(D, N, T, Py_BuildValue("(O)",(PyObject*)&B)) + /* Convert a method list to a method chain. */ #define METHOD_CHAIN(DEF) { DEF, NULL } @@ -411,6 +431,8 @@ PyObject *MethodType; PyObject *(*Method_New)(PyObject *callable, PyObject *inst); int (*issubclass)(PyExtensionClass *sub, PyExtensionClass *type); + int (*ExportSubclass)(PyObject *dict, char *name, + PyExtensionClass *ob_type, PyObject *bases); } *PyExtensionClassCAPI = NULL; typedef struct { PyObject_HEAD } PyPureMixinObject; /* TESC -- Test ExtensionSubClass. I know it is not a great name :) */ #include "ExtensionClass.h" staticforward PyExtensionClass ClsType; staticforward PyExtensionClass SubclsType; static void dealloc(PyObject *self) { PyMem_DEL(self); } static PyObject * getattr(PyObject *self, char *attr) { return Py_FindMethod(cls_methods, self, attr); } static PyObject * cls_m1(PyObject *self, PyObject *args) { return PyString_FromString("m1 of Cls called"); } static PyObject * cls_m2(PyObject *self, PyObject *args) { return PyString_FromString("m2 of Cls called"); } static struct PyMethodDef cls_methods[] = { {"m1", (PyCFunction)cls_m1, 1, ""}, {"m2", (PyCFunction)cls_m2, 1, ""}, {NULL, NULL} }; static PyObject * sub_m1(PyObject *self, PyObject *args) { return PyString_FromString("m1 of Subcls called"); } static PyObject * sub_m3(PyObject *self, PyObject *args) { return PyString_FromString("m3 of Subcls called"); } static struct PyMethodDef sub_methods[] = { {"m1", (PyCFunction)sub_m1, 1, ""}, {"m3", (PyCFunction)sub_m3, 1, ""}, {NULL, NULL} }; static PyExtensionClass ClsType = { PyObject_HEAD_INIT(NULL) 0, /*ob_size*/ "Cls", /*tp_name*/ sizeof(PyExtensionClass), /*tp_basicsize*/ 0, /*tp_itemsize*/ /* methods */ (destructor)dealloc, /*tp_dealloc*/ (printfunc)0, /*tp_print*/ (getattrfunc)getattr, /*tp_getattr*/ (setattrfunc)0, /*tp_setattr*/ (cmpfunc)0, /*tp_compare*/ (reprfunc)0, /*tp_repr*/ 0, /*tp_as_number*/ 0, /*tp_as_sequence*/ 0, /*tp_as_mapping*/ (hashfunc)0, /*tp_hash*/ (ternaryfunc)0, /*tp_call*/ (reprfunc)0, /*tp_str*/ (getattrofunc)0, /*tp_getattr with object key*/ (setattrofunc)0, /*tp_setattr with object key*/ /* Space for future expansion */ 0L,0L, NULL, /* Documentation string */ METHOD_CHAIN(cls_methods) }; static PyExtensionClass SubclsType = { PyObject_HEAD_INIT(NULL) 0, /*ob_size*/ "Subcls", /*tp_name*/ sizeof(PyExtensionClass), /*tp_basicsize*/ 0, /*tp_itemsize*/ /* methods */ (destructor)dealloc, /*tp_dealloc*/ (printfunc)0, /*tp_print*/ (getattrfunc)getattr, /*tp_getattr*/ (setattrfunc)0, /*tp_setattr*/ (cmpfunc)0, /*tp_compare*/ (reprfunc)0, /*tp_repr*/ 0, /*tp_as_number*/ 0, /*tp_as_sequence*/ 0, /*tp_as_mapping*/ (hashfunc)0, /*tp_hash*/ (ternaryfunc)0, /*tp_call*/ (reprfunc)0, /*tp_str*/ (getattrofunc)0, /*tp_getattr with object key*/ (setattrofunc)0, /*tp_setattr with object key*/ /* Space for future expansion */ 0L,0L, NULL, /* Documentation string */ METHOD_CHAIN(sub_methods) }; static struct PyMethodDef methods[] = {{NULL, NULL}}; void initTESC() { PyObject *m, *d; m = Py_InitModule("TESC", methods); d = PyModule_GetDict(m); PyExtensionClass_Export(d, "Cls", ClsType); PyExtensionClass_ExportSubclassSingle(d, "Subcls", SubclsType, ClsType); }

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Re: [Zope-dev] Manipulating Meta-Type Global Add list on per-instance basis
by Tres Seaver 03 Mar '00

03 Mar '00

Josh Zeidner <jmz_phylogenic(a)hotmail.com> wrote: > > I Am currently using the scheme that I explained in previous postings in > an ZClass derived from Object mangager. However, I am facing one small > problem. If the ZClass is defined to have *NO* allowable subobjects, adding > any meta-types through my code has no effect. If the ZClass is defined to > have at least one allowable sub-type, then everything behaves properly. It > is my contention that when the first Meta-Type is added through the > "subobjects" tag, something else is happening that I am not reproducing in > my code, so... > > 1) Do you think this assumption is correct? > > 2) What is it that I am missing from my code? > > thanks for all the help... Josh Zeidner Senility must be setting in -- I'd swear you send me a follow up to this, with a resolution, but I don't see it anywhere in my mail folders. Are you still working on it? Tres -- ========================================================= Tres Seaver tseaver(a)palladion.com 713-523-6582 Palladion Software http://www.palladion.com

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problems with TM.py
by Pavlos Christoforou 03 Mar '00

03 Mar '00

Hello everyone - I am having problems withZope's Transaction manage which think it might be buggy. TM.py defines _registered as a class variable which seems to hold the state of an instance (whether it is registered with the transaction manager or not). method _register() registers the instance with the TM depending on the content of the _registered attribute. this however seems to have the additional effect to set the instance as changed and therefore and therefore a new version is stored in the ZODB. Additionally as _registered is defined as a class variable it is shared among threads and therefore one thread can interfere with the state of another. I have changed all references to _registered in TM.py to _v_registered and my problem (creating new versions for every call to FSSession) is solved, but I am not sure what other classes use TM.py. Also I am thinking of changing _v_registered to an instance attribute instead of a class attribute. Any thoughts?? Is it a bug of TM.py DC has promised many times to publish their model of the transaction manager and maybe a few usage comments ... which will save us *a lot* of time. TIA Pavlos

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ANNOUNCE: ZScheduler 1st alpha release
by Loren Stafford 02 Mar '00

02 Mar '00

With some trepidation (because it's my first Python/Zope/OO product) I'd like to announce availablity to developers of the first alpha release of ZScheduler. ZScheduler is a Zope product that does event scheduling for Zope applications -- similar to what cron does for Unix applications. You define a special kind of DTML method and specify when you want that method to run. When the specified time arrives, ZScheduler calls the method. Be advised that this product was functional for the first time yesterday, has been subject to light testing on Win98 only, and is known to be fragile under certain conditions (like if you manually delete the schedule or items in the schedule while it's running). Run it only in a laboratory environment, not on any production systems. That said, I hope you will try out this preliminary version and let me know how I can make it more useful as a basis for event scheduling in Zope. I'd also like to hear what kind of applications you find it useful for. And, of course, should you find any bugs, let me know. http://www.zope.org/Members/lstaffor/ZScheduler Many thanks to Martijn Pieters, for the initial design and code base, and to Martijn and others on this list for help during development. -- Thanks -- Loren

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ZCLass Icons
by Josh Zeidner 02 Mar '00

02 Mar '00

Hello, Has anyone had any luck defining icons for ZClasses... is there a trick to this? -thanks JMZ ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com

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Site-Access Problem
by Martin Grönemeyer 02 Mar '00

02 Mar '00

Hello, we have some strange problems with the "SiteAccess"-Product. We are building up three web-applications on one Zope-Server and three different domains. Everything works fine with the "Site-Access" but if you have more than 5 requests at one of the sites the speed gets very slow and you have to wait about 3-5 seconds to get back a simple dtml-document. We made some tests with the __no_before_traverse__ in the url and found that there isn't that speed-problem if we access the documents direct without use of the virtual-hosting. Has anybody the same problem or an idea how to solve this ? Martin

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dynamic setting of attributes
by Robert Sander 02 Mar '00

02 Mar '00

Hi, it's me again.. I am working on a product with integrated caching mechanism. My product stores files with a MIME type, filename and content in an object with an unique ID. I do not want to use the filename as object IDs, because it is not unique. I have an index_html method that set the "Content-Type" header to the MIME type and returns the content, so that every browser should handle it correctly. The only disadvantage of this method is the loosing of the filename. I thought I could easily setattr(self, filename, self.index_html) but this results in a "Cannot pickle object" error. Any hints appreciated. Greeting -- Robert Sander www.gurubert.de

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Getting meta_type of object using ZPublisher.Client
by Itamar Shtull-Trauring 02 Mar '00

02 Mar '00

I've started working on a GUI frontend for load_site, and I need a way to find out the meta_type of Zope objects I'm listing. I'm using ZPublisher.Client, so I'm limited in what I have access to. getProperty does not work, and I can't think of any other way to access it. Any ideas? -- -= This is NOT a pyramid scheme =- The SNAFU Principle: True communication is possible only between equals Itamar S.T. itamars(a)ibm.net

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