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ZCatalog hackery
by morten＠esol.no 03 Mar '01

03 Mar '01

Hi guys, I've got a problem with ZCatalog. I've got plenty of large objects, ranging from 100KB to 100MB in size. Needless to say, these take up a lot of processor time when indexed by the ZCatalog. Now, these object have to be moved from time to time, only moved, so that one or two of the related columns and indexes are affected (the path and the parent container id); is there a way to go around this so that those two, the one column and the index are updated, and not, let's say the indexed body (which is 100KB - 100MB in size) ? Thanks, Morten

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Re: [Zope-dev] strip_html?
by Dieter Maurer 03 Mar '01

03 Mar '01

R. David Murray writes: > I searched the NIP archives but didn't get any hits on strip_html. Is the > code for this beast (used by zope.org to strip html out of partial text > included from another page) available anywhere? I do not know about "strip_html" but you may find something similar in URL:http://www.dieter.handshake.de/pyprojects/zope/CatalogSupport.html Dieter

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Authentication
by Philipp von Weitershausen 03 Mar '01

03 Mar '01

Hi there, I'm using Zope for a school's homepage. There is a small team of people managing the site. Their user definitions (in acl_users) have the "team" role wich is defined at the root folder. The "team" role is allowed to do everything except managing users. The team has been able to manage DTML Documents and Folders so far. Now I've written a tiny python product (using the how-to). And now they're not allowed to manage the properties of instances. Interesting enough, my self-defined permissions don't appear under "Security". What am I doing wrong? Here is a code sniplet out of my python code: __ac_permissions__= ( ('View management screens', ('manage_main', 'manage_InfoForm'), ('Manager,')), ('View', ('', 'index_html', 'getInfo', 'getPhoto'), ( 'Manager', 'Anonymous')), ('Add Image', ('manage_addImage',), ('Manager',)) ) ... Globals.default__class_init__( CkTeacher ) Another problem: A DTML Method calls objectValues() on the folder. Calling the method on any sub-folder works, but calling it on the root folder fails, even when I'm logged in as a Manager. I figured it fails because of some sub-object's permissions. Thanks in advance Phil. -- Philipp von Weitershausen [ *pronounce: "fun Viters-houzen" ] Web http://www.philikon.de

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TransWarp preview release (AOP tools only)
by Phillip J. Eby 03 Mar '01

03 Mar '01

It's here... the first preview release of TransWarp. The bad news is, it only contains working versions of the aspect-oriented programming tools (the rest of the package is in flux). The good news is: 1. It's a *robust* working version, with 114 unit tests to prove it, and 2. There's state-of-the-art documentation, including such cutting-edge technology as tutorials, and super-simple examples. :) You can find the software at: http://www.zope.org/Members/pje/TransWarp/ and the online documentation at: http://www.zope.org/Members/pje/Wikis/TransWarp/ Comments welcome. Enjoy.

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Re: [Zope-dev] ZDebug conflicts with MailHost?
by Dieter Maurer 03 Mar '01

03 Mar '01

Itai Tavor writes: > On Zope 2.3.0 and 2.3.1b1, the following method produces an error > when ZDebug is installed; If I remove ZDebug, it works fine. > .... A long time ago, there was firm evidence that ZDebug does not play well with "sendmail" (-> list archives). But, I had thought, this had been fixed. Dieter

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DB connection pooling
by Erik Stephens 02 Mar '01

02 Mar '01

Hello all, I've been working on an implementation of connection pooling for the MySQLDA. Basically, Zope connections will be pooled by connection string to reduce the number of unecessary connections to MySQL. The number of connections will be reduced in 2 respects: 1) Multiple threads will share the connection pool and 2) Zope connection objects that use the same connection will be pooled. A slight bit of run-time overhead will be introduced from having to look up connection objects by connection string, but the trade-off will be well worth it, at least for our setup. Correct me if I'm wrong, but without pooling, the number of connections that could be created is: <num Zope servers> * <num Zope threads> * <num connection objects>. With pooling, this number becomes: <num Zope servers> * <num distinct connection strings> * X. X can range from 1 to <num Zope threads>, depending on how high load is. Question to y'all is this: Is this a worthwhile endeavor? Would others find this useful? Or are we just weird? The new release of the postgresql dba announce today mentioned "automatic management of multiple phisical connections to the DB (one per thread) to speed up queries". Is this connection pooling in some form? Thanks, Erik

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Re: [Zope-dev] TransWarp preview release (AOP tools only)
by Phillip J. Eby 02 Mar '01

02 Mar '01

At 03:53 PM 3/2/01 -0500, R. David Murray wrote: >On Fri, 2 Mar 2001, Shane Hathaway wrote: >> "Phillip J. Eby" wrote: >> > One reason I've been racing like mad to get the preview release out is so >> > that, after seeing the usefulness of TW for the Zope 3 component >> > architecture, y'all might be interested in considering implementations for >> > module persistence besides proxying. :) IMHO, a "rollback importer" >> > approach ala unittest might be better suited for TW-ish components, and >> > have fewer weird side effects for persistent modules generally. I don't >> > like unittest's mechanism for *doing* the rollback, and Zope would need a >> > thread-specific version of sys.modules, as well as a mechanism to purge the >> > cache of any objects which were loaded after any of the purged modules, but >> > I think the basic idea is sound. >> >> Hmm. I'm afraid I don't see how TW helps with module persistence. > >I could be wrong, but I didn't read what Phillip wrote as saying he was >suggesting TransWarp as a player in the Module Persistence implementation, >but rather that he wanted people to see the value of TransWarp first hand >so that they would want to make sure that Module Persistence and TransWarp >could play together.... > Yes, that's exactly what I meant. :)

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Re: [Zope-dev] dtml-in: next-batches
by Dieter Maurer 02 Mar '01

02 Mar '01

Brett Carter writes: > I'm running Zope 2.2.2, and I'm trying to use the batching stuff for > the dtml-in tag, however, I can't seem to access any attributes off > the 'next-batches' or 'previous-batches' mapping object that's > supposed to be available, with the attributes 'batch-start-index', > 'batch-end-index', and 'batch-size'. > .... > I wrote an external method to dir the 'next-batches' object, and it > seems the only attributes available are: > ['data', 'items', 'query_string', 'start_name_re'] The attributes your are looking for are in fact keys of the mapping 'data'. Dieter

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Re: [Zope-dev] Increased system CPU cycles under heavy load?
by Dieter Maurer 02 Mar '01

02 Mar '01

Erik Stephens writes: > Does anyone know what kinds of operations fall under 'system'? Task > switching, paging, these kinds of things? The computer can execute instruction being part of the operating system (usually priviledged code) or of user processes. The first would be accounted for as system, the latter as user time. System time includes (as you expect) scheduling, but also memory management (swapping in and out, paging in and out), IO activity, inter-process communication and all other operating system services. Dieter

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New PostgreSQL Database Adapters: psycopg and ZpsycopgDA
by Federico Di Gregorio 02 Mar '01

02 Mar '01

Hi *, the guys here at initd (http://initd.org/) arre happy to announce the release of psycopg, a Python/PostgreSQL driver module and ZPsycopgDA, a Zope Database Adapter based on the psycopg driver. Now, I'll answer the questions you asked... (_what_ questions? well... follow me...) Q. Why another postgresql dba? we already have pygres and popy! A. That's true. We had some ideas about a performant, thread-safe driver and we wanted to hack a little bit. the resulting driver is slim, fast, with clean code and some nice features (see below.) Writing a Zope DBA was a logical consequence only because we use it. Q. Should I switch to psycopg and zpsycopgda? A. Not if you are happy with your current driver [and i hope it is popy ;-)] The only real reason is if you want the advanced features you can find only in psycopg: 1/ level-2 thread safety 2/ advanced type-casting system 3/ automatic management of multiple phisical connections to the DB (one per thread) to speed up queries 4/ extremely clean and maintainable code also, in a future release (0.5) zpsycopgda will support db and table management from zope management screens. Q. Hey! you're from MIXAD LIVE, is psycopg a popy fork? A. No, psycopg is 100% clean code. we had some ideas on how a db driver should workin a heavily multithreaded environment and we wanted to test them. that's all. Q. Where can I download it? A. http://initd.org/Software/psycopg (tarball and precompiled debian packages) ciao and good hacking, federico -- Federico Di Gregorio MIXAD LIVE Chief of Research & Technology fog(a)mixadlive.com Debian GNU/Linux Developer & Italian Press Contact fog(a)debian.org Qu'est ce que la folie? Juste un sentiment de liberté si fort qu'on en oublie ce qui nous rattache au monde... -- J. de Loctra

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