September 2000 - Zope

RE: [Zope] Python, persistent objects and caching
by Brian Lloyd 07 Sep '00

07 Sep '00

> I'm developing a Python-based product that uses persistent objects in > ZODB to store its configuration. No surprises there, but my product is > also using volatile attributes to do a bit of caching of its own. The > thing is, when ZODB takes a sweep every 60 seconds to flush it's own > cache it will quite often flush my product as well, essentially > rendering my 15 minute caching ineffective. > > If there a way I can prevent this from happening? > > References: > http://www.zope.org/Members/MikeP/volatile > http://www.zope.org/Members/Zen/tips/VolatileAttributes > > Soren Roug One approach would be to cache your data in the module's namespace. For ex: mycache={} class MyClassThatKeepsGoingAway: ... def get_data(self, id): if mycache.has_key(id): return mycache[id] else: ... Note that my example is a little contrived, since using a module variable means that you will have to implement this in a way that is safe for a multi-threaded environment. You will also want to make sure that your module-level cache doesn't grow forever and take up a lot of memory. Hope this helps! Brian Lloyd (brian(a)digicool.com)

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ZClass base classes
by Nick Trout 07 Sep '00

07 Sep '00

I've looked all throught docs but I cant find anywhere an explanation of what properties the ZClass base classes give you. Also which order to inherit them, as the Developers Guide claims the order is important. Can anyone please enlighten me? Regards, Nick.

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Portal Toolkit and NTUserFolder
by neeloy_saha 07 Sep '00

07 Sep '00

Hi all, Can anybody tell me how to integrate the NTUserFolder and the portal toolkit -neeloy

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generate static html to webserver?
by Torsten Eymann 07 Sep '00

07 Sep '00

Hello, I want generate a static site from zope-folder and his subfolders to put that on an really-internet-server. Can I do that? How? thanks torsten

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ZODB How To please HELP
by Norman Khine 07 Sep '00

07 Sep '00

I am trying to follow the How to on ZODB How To, but I get stuck at the point of when testing the sqlInsertProduct When I submit the query I get the following error Error, exceptions.SyntaxError: unexpected token sequence.near :: '_weight)\012VALUES'*'\012widget,\012Histor' ******************************* current state = 141 expects: '(', ('nomatch1',) current token = ((-8, 'user_defined_name'), 'WIDGET') SQL used: Could not render the query template! Please help Thanks Norman

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Python, persistent objects and caching
by Soren Roug 07 Sep '00

07 Sep '00

Hi, I'm developing a Python-based product that uses persistent objects in ZODB to store its configuration. No surprises there, but my product is also using volatile attributes to do a bit of caching of its own. The thing is, when ZODB takes a sweep every 60 seconds to flush it's own cache it will quite often flush my product as well, essentially rendering my 15 minute caching ineffective. If there a way I can prevent this from happening? References: http://www.zope.org/Members/MikeP/volatile http://www.zope.org/Members/Zen/tips/VolatileAttributes Soren Roug

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Zope 2.2.1 Solaris 8 dumps core
by Michele Ravani 07 Sep '00

07 Sep '00

Hi I've downloaded the src of Zope 2.2.1 on my UltraSparc running Solaris 8, built it ok, but when I try run ./start it it dumps core with a segmentation fault. Is this problem known? Anything I can do? I am completely new to both Python and Zope ... Thanks Michele ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ #0 initExtensionClass () at ./../Components/ExtensionClass/ExtensionClass.c:3508 3508 ECTypeType.ob_type=&PyType_Type; (gdb) where #0 initExtensionClass () at ./../Components/ExtensionClass/ExtensionClass.c:3508 #1 0x28ddc in _PyImport_LoadDynamicModule (name=0xefff310b "ExtensionClass", pathname=0xefff2c10 "/home/michele/Projects/Zope-2.2.1-src/lib/python/ExtensionClass.so", fp=0xb2fc0) at ./importdl.c:851 #2 0x26ee4 in load_module (name=0xefff310b "ExtensionClass", fp=0xb2fc0, buf=0xefff2c10 "/home/michele/Projects/Zope-2.2.1-src/lib/python/ExtensionClass.so", type=3) at import.c:1210 #3 0x27cf0 in import_submodule (mod=0x9f1dc, subname=0xefff310b "ExtensionClass", fullname=0xefff310b "ExtensionClass") at import.c:1755 #4 0x27870 in load_next (mod=0xe6100, altmod=0x9f1dc, p_name=0xefff310b, buf=0xefff3100 "ZPublisher.ExtensionClass", p_buflen=0xefff30fc) at import.c:1607 #5 0x2742c in import_module_ex (name=0x0, globals=0x185428, locals=0x185428, fromlist=0xe78e0) at import.c:1445 #6 0x275cc in PyImport_ImportModuleEx (name=0x1a2004 "ExtensionClass", globals=0x185428, locals=0x185428, fromlist=0xe78e0) at import.c:1489 #7 0x48dd8 in builtin___import__ (self=0x0, args=0x185ba0) at bltinmodule.c:65 #8 0x1e1d4 in call_builtin (func=0xb45b0, arg=0x185ba0, kw=0x0) at ceval.c:2359 #9 0x1e0a0 in PyEval_CallObjectWithKeywords (func=0xb45b0, arg=0x185ba0, kw=0x0) at ceval.c:2324 #10 0x1c574 in eval_code2 (co=0x1a2570, globals=0x0, locals=0x185428, args=0x0, argcount=0, kws=0x0, kwcount=0, defs=0x0, defcount=0, owner=0x0) at ceval.c:1445 #11 0x1a390 in PyEval_EvalCode (co=0x1a2570, globals=0x185428, locals=0x185428) at ceval.c:324 #12 0x26210 in PyImport_ExecCodeModuleEx (name=0xefff42c0 "ZPublisher.BaseRequest", co=0x1a2570, pathname=0xefff38e0 "/home/michele/Projects/Zope-2.2.1-src/lib/python/ZPublisher/BaseRequest.pyc") at import.c:485 #13 0x26744 in load_source_module (name=0xefff42c0 "ZPublisher.BaseRequest", pathname=0xefff38e0 "/home/michele/Projects/Zope-2.2.1-src/lib/python/ZPublisher/BaseRequest.pyc", fp=0x1a2570) at import.c:724 #14 0x26eb4 in load_module (name=0xefff42c0 "ZPublisher.BaseRequest", fp=0xb2fb0, buf=0xefff3dd0 "/home/michele/Projects/Zope-2.2.1-src/lib/python/ZPublisher/BaseRequest.py", type=1) at import.c:1202 #15 0x27cf0 in import_submodule (mod=0xe6100, subname=0xefff42cb "BaseRequest", fullname=0xefff42c0 "ZPublisher.BaseRequest") at import.c:1755 #16 0x2781c in load_next (mod=0xe6100, altmod=0x9f1dc, p_name=0xefff42cb, buf=0xefff42c0 "ZPublisher.BaseRequest", p_buflen=0xefff42bc) at import.c:1603 [...]

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RE: [Zope-dev] date formatting / extracting substrings
by Chris McDonough 07 Sep '00

07 Sep '00

Hi Jeff, (I've moved this to the Zope list out of Zope-Dev) <dtml-let month_value="MonthID[4:]"> ... do something with the result ... </dtml-let> Have a look at the Python documentation as it relates to "slicing". > -----Original Message----- > From: Jeff Nielsen / Ugo Fast [mailto:Jeff@UgoFast.com] > Sent: Thursday, September 07, 2000 1:10 AM > To: Zope-Dev@Zope. Org > Subject: [Zope-dev] date formatting / extracting substrings > > > Hello out there in Zope world! > > Again, I'm completely baffled by Zope and the docs are no > help either. I'm > trying to take an input of a date in the form YYYYMM as the > variable MonthID > and create a string in the form Month, YYYY as a variable > named MonthName. > For instance, a MonthID of 200009 should return a MonthName > of "September, > 2000". > > I've been looking in the docs and the emails, but I can't > figure out how to > extract substrings. I think something like this should work > to seperate the > month value from the MonthID, but it doesn't: > > <dtml-call "REQUEST.set('MonthValue', _.substring(MonthID,5,2))"> > > Any guidance would be appreciated. > > ----------------------- > Jeff Nielsen > http://www.UgoFast.com/ > "Where U Go Fast" > > > _______________________________________________ > Zope-Dev maillist - Zope-Dev(a)zope.org > http://lists.zope.org/mailman/listinfo/zope-dev > ** No cross posts or HTML encoding! ** > (Related lists - > http://lists.zope.org/mailman/listinfo/zope-announce > http://lists.zope.org/mailman/listinfo/zope ) >

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Whitespace in lines property
by Tim Cook 07 Sep '00

07 Sep '00

Can anyone tell me why when I edit a lines property I get leading whitespace inserted? The first line gets seven & each one after that gets 10 spaces. I tried stripping it out but this didn't seem to have any effect. ... <textarea name="alt_names:lines" rows="10" cols="50" > <dtml-in alt_names> <dtml-let cur_item=sequence-item> <dtml-var "_.string.strip(cur_item)"> </dtml-let> </dtml-in> </textarea> ... Thanks, -- Tim Cook -- FreePM Project Coordinator http://www.freepm.org OS Health Care Alliance Supporter http://www.oshca.org

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supplemental group ids (Linux)
by rugger＠pangea.ca 07 Sep '00

07 Sep '00

I noticed when starting Zope as root (to get privilaged ports), but requesting suid to `nobody' (start -u nobody) the resulting processes have the correct uid and gid, but the supplemental group id list still has the appropriate value for root. This means that the Zope process could, for example, write to files that may belong to root. It's not clear whether this deserves a bug report, so I though I'd ask here instead. The fix is easy (and very lightly tested): 1) grab and install the supplemental gid package (for python) http://www.ccraig.org/software/group.c 2) patch (for 2.2.0) --- z2.py.orig Fri Jun 30 10:23:53 2000 +++ z2.py Mon Sep 4 14:33:51 2000 @@ -682,13 +682,20 @@ if type(UID) == type(""): uid = pwd.getpwnam(UID)[2] gid = pwd.getpwnam(UID)[3] + uname = UID elif type(UID) == type(1): uid = pwd.getpwuid(UID)[2] gid = pwd.getpwuid(UID)[3] + uname = pwd.getpwuid(UID)[1] else: raise KeyError try: if gid is not None: + try: + import group + group.initgroups(uname, gid) + except: + pass try: os.setgid(gid) except OSError:

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