February 2000 - Zope-Dev

RE: [Zope-dev] Zope as a proxy - cache server
by Martijn Pieters 15 Feb '00

15 Feb '00

From: Sin Hang Kin [mailto:kentsin@macau.ctm.net] > > Can I use zope as a proxy / cache server? Does it require to > make changes on > the zserver code or just zclient is enough? > ZServer will have to be changed to parse out and make available the protocol, host and port number parts of the request. Currently, ZServer adhers closely to the HTTP RFC by allowing only requests of the form '[METHOD] [/path] HTTP/[version]'. Proxy requests are of the form '[METHOD] [Full URL] HTTP/[version]', where [Full URL] is something like http://a.host.address/path. There may be other issues, this is one I know of. -- Martijn Pieters, Software Engineer | Digital Creations http://www.digicool.com | Creators of Zope http://www.zope.org | mailto:mj@digicool.com ICQ: 4532236 | PGP: http://wwwkeys.nl.pgp.net:11371/pks/lookup?op=get&search=0xA8A32149 -------------------------------------------

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Re: Fwd: Re: [Zope-dev] Performance
by fog＠mixadlive.com 15 Feb '00

15 Feb '00

Hi, i write to tell you that zope can do much better but even much worser. the site www.tradinglab.com is powered by 4 netfinity and each of them is capable to handle about 150000 hits a day for a total of 600000+ hits. we use a modified kernel (see the linux virtual server pages, www.linux-vs.org) and apache+zope. the "worse" part is that the 2 biprocessor machines rate really bad when compared with the monoprocessor ones. and under a heavy load zope does much better when forced to use only 1 or 2 threads. with more threads it just lock. the problem is more evident on the 2-processor box, maybe evidentiating a deadlock problen. if you want better statistics i can post to this list the webalizer generated html pages. ciao, federico -- Federico Di Gregorio MIXAD LIVE System Programmer fog(a)mixadlive.com Debian GNU/Linux Developer & Italian Press Contact fog(a)debian.org Nobody will ever need more than 640k RAM! -- Bill Gates, 1981 Windows 95 needs at least 8 MB RAM. -- Bill Gates, 1996 Nobody will ever need Windows 95. -- logical conclusion

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Annoying data interference bug
by Bill Anderson 15 Feb '00

15 Feb '00

OK, this is getting really annoying. I am modifying the BannerFolder Product to use local and remote banners. In doing so, I added a property called link_code (string), and one called local (boolean) to the Banner object. The trick is, when the banner is rendered, it looks at local; if local is true, it builds the HTMl like normal. If local is false, it simply returns the link_url field. Easy enough, and mostly works. Mostly. However, the breakage is really, really wierd. given the following: link_url: <a href="http://www.foo.com/somepage"><img src="http://www.foo.com/adimages/?image=foo1></a> local:1 I should see the contents of link_url. What I really get is: <a href="http://www.foo.com/somepage"><img src="http://www.libc.org/hbanner/http://www.foo.com/adimages/?image=foo1></a> What in the world could be causing this? I don't do _anything_ with the contents of link_code; I only return them. I could almost understand it if it put the extra "http://www.libc.org/hbanner/" in fornt of the whole thing, but not only ion the img tag. Help? Please? Bill -- In flying I have learned that carelessness and overconfidence are usually far more dangerous than deliberately accepted risks. -- Wilbur Wright in a letter to his father, September 1900

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JOBS: Python/Zope positions available!
by Ty Sarna 15 Feb '00

15 Feb '00

Wanted: Python/Zope developers. Who are we? We're a small team within the world's largest web hosting organization (525,000 domains served). We see our mission as being a "city planning department" of sorts for the company. We plan for the growth of that community and develop the tools to make the community work through collaboration. Our flagship tool is a Python/ZPublisher based request-tracking system that currently serves about 20,000 requests per week. We use open source software heavily and like to contribute back to the community, as you've seen. We expect to do even more of this in the future. Not only will we pay you to think up neat new stuff and write it, but you can likely give it away. Our team is currently at 5 people, looking to grow to 6 or 7. Our team is headed by a developer, not a "PHB". Two of us are developers, the other three handle system administration, process consulting, training, etc. However, we all do a little bit of everything. We're looking for one strong developer, and one person with some mix of consultant/developer/admin capabilities. We strive to be a closely knit team and the nature of our work requires that we work in the same place most of the time, so relocation to the sunny Boca Raton, FL area is required. Poor you. :-) We provide Medical, Dental, 401k, bonuses and options, etc. EOE. The developer applicant should have significant Python and/or Zope experience. The following technical knowledge and skills would be beneficial (We don't expect anyone to know all or even half of this, but flexibility and willingness to learn new things, including things not on this list or which haven't been invented yet, is important. We work on a variety of projects, so adaptability and a certain jack-of-all-tradesness is a key quality): * Python * Zope * ZPublisher/Bobo (independent of Zope) * OO design skills * SQL * LDAP * XML-RPC, CORBA, or SOAP * Experience building web-based applications * HTML design * Knowledge of workflow automation principles * Threaded programming * GUI and visual design * System administration experience, especially Unix and Sybase. Knowledge of a variety of Unix-derived OSes is a plus. * Ability to write technical documentation * Javascript (especially in relation to DTML) * C (especially in relation to Python) The consultant/trainer/admin position should have have some technical skills plus strong networking skills (in the "with people" sense) and verbal and written communications skills, the ability to figure out requirements for systems (not only computer systems, but systems of people and procedures), figure out how people do, would, and should use them, explain them, document them, train people on them, figure out what works and what doesn't, and generally see the "big picture". Applicants for either position would greatly benefit from having qualities of the other. Interested? Please email privately to Phillip J. Eby <pje(a)telecommunity.com> with your resume, and more importantly with a brief description of your qualifications as relevant to the above. Also, please include your salary requirements.

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Object Based OS Security
by Jerry.Spicklemire＠IFLYATA.COM 14 Feb '00

14 Feb '00

Lightbulb class article about the EROS* Project. http://www.infosecuritymag.com/feb2000/eros.htm * Extremely Reliable Operating System

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Patch to allow rearranging properties via "First"
by Jeff K. Hoffman 14 Feb '00

14 Feb '00

Here is a patch I just finished to allow one to rearrange the properties of an object via the "First" mechanism present elsewhere in Zope. I have tested this, somewhat, and found no problems thus far. I would appreciate some of you trying it out and let me know if you find any issues. If not, I'll submit it to the collector and let DC decide its fate. To apply it, go to your zope directory and type 'patch -p0 < the_patch'. Enjoy! --Jeff --- Jeff K. Hoffman 704.849.0731 x108 Chief Technology Officer mailto:jeff@goingv.com Going Virtual, L.L.C. http://www.goingv.com/

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Zope Job in Charlotte, NC
by Jeff K. Hoffman 14 Feb '00

14 Feb '00

Going Virtual, L.L.C., an internet company serving the non-profit industry, is immediately seeking a Python/Zope developer in the greater Charlotte area and the surrounding Carolinas to add to our small, tightly knit development team. This position requires 2-3 years of programming experience, in general; 1 year of experience with Python; and 6 months of experience with Zope. Must have good working knowledge of relational databases. Candidates with a strong background in Object Oriented development will be preferred. Salary commensurate with skills and experience. If you live outside the local area and wish to relocate, please advise accordingly. Applicants must be authorized to work in the USA. For further information please e-mail your most current resume to mailto:jeff@goingv. Plain text preferred, StarWriter, Word, and RTF accepted. --- Jeff K. Hoffman 704.849.0731 x108 Chief Technology Officer mailto:jeff@goingv.com Going Virtual, L.L.C. http://www.goingv.com/

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Announce: Persistent list class
by Andrew Wilcox 14 Feb '00

14 Feb '00

Here's a small but useful utility class that implements persistent lists. It recognizes when it has been modified, and triggers the ZODB persistence mechanism. I also threw in a PersistentDict class that implements persistent dictionaries. This is very similar to the PersistentMapping that comes with Zope, but is a little more straightforward. It doesn't restrict keys to be strings, and doesn't hide keys that begin with an underline. Code is available at http://www.zope.org/Members/AndrewWilcox/PersistentListDict As an example, here's a class that uses a regular Python list. Because the ZODB doesn't know when the list has been modified automatically, the programmer needs to trigger persistence by setting one of the object's attributes. class Myclass (Persistent): def __init__(self): self.l = [1, 2, 3, 4, 5, 6] def act(self): l = self.l l[2:4] = [33, 37, 39, 41, 44] self.l = l By using a PersistentList, the ZODB will know when the list has been changed. class Myclass (Persistent): def __init__(self): self.l = PersistentList([1, 2, 3, 4, 5, 6]) def act(self): self.l[2:4] = [33, 37, 39, 41, 44] I am experiencing a bug in Zope 2.1.4 where the comparision method, __cmp__, is not getting called consistently in Persistent subclasses. Don't know what that it about. If you need to compare persistent lists, use list() to get you a regular list and compare on that.

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RE: [Zope-dev] Computed fields in ZCatalog
by Martijn Pieters 14 Feb '00

14 Feb '00

From: Kevin Dangoor [mailto:kid@kendermedia.com] > > Looking at the ZCatalog code, if an index or metadata > field is callable > for a particular object, then that function will be called. > However, it > isn't called with *any* parameters. Is there any way to make > that metadata > value based upon other values in the object? > > For example, if I wanted to create a method that would return > Property1+Property2 and have that value show up in the > Catalog, can that be > done? Only with methods that don't need any arguments, like an External Method. DTML Methods required arguments, so they will not do. -- Martijn Pieters, Software Engineer | Digital Creations http://www.digicool.com | Creators of Zope http://www.zope.org | mailto:mj@digicool.com ICQ: 4532236 | PGP: http://wwwkeys.nl.pgp.net:11371/pks/lookup?op=get&search=0xA8A32149 -------------------------------------------

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Enabling cut/copy/paste/rename in ObjectManagers
by Adrian Hungate 13 Feb '00

13 Feb '00

I have re-written my ZStyleSheet product in python (I was having problems that I could not solve easily with DTML Methods) but I have hit another problem. I have 4 basic object classes, two of which are ObjectManagers, and I had (naively) expected them to immediately support cut/copy/paste/rename, but it would seem that my objects don't support these functions, and I can't work out why. Could someone tell me what an object needs to support these functions, and do the changes need to be to the parent or child objects? Haqa...

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