January 2001 - Zope - Zope lists

href on a local file
by tilo.schwarz＠daimlerchrysler.com 11 Jan '01

11 Jan '01

Hi everybody, it's now my third day with Zope and I'm already pretty happy with it. Finally I got external python methods running with passing parameters to them and getting return values back. Although there is a lot of documentation, I couldn't find any about the Zope internals. Does anybody know where to look for such documentation? Now my question concerns local files. We do image processing and have zillions of images. I'd like to do some "have a page of thumbsnails and click on it to see the full image" kind of web page. I saw the examle thumbnail code in http://www.zope.org/Members/michel/ZB/ScriptingZope.html, but that code puts the thumbnails into the Zope Database within the python script. I'd like to avoid that, because with our zillion images this would bloat the database pretty much. If I got the docs right, it's normally not possible to publish a local file with Zope, only objects in the database can be published (correct?). But I would like to use a href like <A HREF="http://mymachine/images/0000.pgm"> <IMG SRC="http://mymachine/images/thumbs/0000.pgm"></A> in the dtml. If I understand it right, the product "Local File System" would be a possibility to do that. Is it the right way to go, or does anybody have a better / other solution? Tanks for any help! BTW: I read about dropping external python modules in some future version of Zope. For us, the main point with Zope is, that you can build a web front end for a bunch of python modules we have. Thus, from our point of view, the dtml-binding possibility to python modules is essential. Tilo

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way to cleanup form input text?
by Chris Beaumont 11 Jan '01

11 Jan '01

Is there a simple way to clean up text that's input to HTML forms in Zope? I have a situation where one of my users is copying text from her web browser and pasting it into Zope. I'm sure this is a common problem.. The input text ends up having runs of whitespace characters in it that I'd like to prune down to one each..and I think it's also been the source of some non-standard, unwanted characters that cause problems if they end up getting into our database.. I'm sure someone else has encountered this problem before..what's the best way to fix it? The string module doesn't seem to have what I want.. (or at least I couldn't find it..) The worst problems seems to be long strings of spaces or tabs that I'd like to turn into single spaces..(each) Thanks! Chris cbeaumon(a)msri.org

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Zope BUG (was: [Zope] Limited File object size?)
by Dieter Maurer 11 Jan '01

11 Jan '01

Stuart Foster writes: > When uploading a file to Zope I am getting an error about commit_sub. > I uploaded some other files to the same folder but am having problems > with two in particular. > He only difference I can see is that the others where 10k to 60k and the > two problem files are 100k and higher. > > Is there a limit on the file size that can be uploaded or is there > another explanation? It is obviously a bug. Put a description into the Collector, if there is not yet one already. The problem came up about 1-2 weeks ago. Maybe, the bug report is already filed. Dieter

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Re: [Zope] How do I get the size of an item ?
by Dieter Maurer 11 Jan '01

11 Jan '01

Dimitris Andrakakis writes: > .... > What I need is, from a dtml method in /news, to get > the size of an object (a file, say /news/files/file01.pdf) > in /news/files. You know Zope's integrated online help? There you would find that files have a method "getSize" that returns their size. In the upcoming Zope bock (-> zope.org) you could read that "dtml-with" can be used to access objects in "foreign" contexts: <dtml-with "news.files"> <dtml-var "_.getitem('file01.pdf').getSize()> </dtml-with> or <dtml-var "_.getattr(news.files,'file01.pdf').getSize()"> will do. Dieter

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Re: [Zope] ZServer
by Dieter Maurer 11 Jan '01

11 Jan '01

Tom Deprez writes: > Can anybody tell me what the following warning means, or where I can find > documentation on this warning? > > ZServer warning : server accept() threw EWOULDBLOCK You can tell a socket that you do not want to wait. If you did, then the socket will return EWOULDBLOCK when you do something that would let you wait. Usually, you have a "listen" above the "accept". When the "listen" returns, you know, there is a connection to "accept". However, if the process that wanted to connect dies, it might be (with low probability) that "listen" returns but when "accept" is reached, the request went away. Because probability is very low, I do not know whether this is your problem. If it is, however, then you could simply ignore the error and restart the "listen". Dieter

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Zope vs. Enhydra
by Paul Browning 11 Jan '01

11 Jan '01

>From the horse's mouth as it were. I'll let the list know where to find it when it appears. Paul --- Begin Forwarded Message --- Date: Wed, 10 Jan 2001 15:16:42 -0800 From: David Young <david(a)enhydra.org> Subject: Lutris Enhydra Journal (3nd issue) is coming! Sender: David Young <david(a)enhydra.org> To: paul.browning(a)bristol.ac.uk Reply-To: David Young <david(a)enhydra.org> Message-ID: <200101102316.PAA17966(a)enhydra.org> The next issue of the Lutris Enhydra Journal will be delivered to you on Monday, 15 January 2001. Articles will include: Brett McLaughlin: Open Source and Commercial Entities Bill Karwin: jFAQ Peter Hearty: InstantDB Hints & Tips Part II Paul Gresham: Zope vs Enhydra Wayne Stidolph: About the Enhydra Services Architecture Peter Darrah: Ant Daryl Tempesta: Skeleton, Build, Rebuild : Stages of development Thomaz Edison: Context-sensitive search engine project at MIT using Enhydra Look forward to your comments and feedback, David Young, Lutris Chief Evangelist and LE Journal Editor david.young(a)lutris.com -- The Library, Tyndall Avenue, Univ. of Bristol, Bristol, BS8 1TJ, UK E-mail: paul.browning(a)bristol.ac.uk URL: http://www.bris.ac.uk/

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Re: [Zope] href on a local file
by Dieter Maurer 11 Jan '01

11 Jan '01

tilo.schwarz(a)daimlerchrysler.com writes: > .... "LocalFS" is a very nice product. I would go for it. Dieter

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RE: SQL Method, dtml-with and namespace weirdness
by Mayers, Philip J 11 Jan '01

11 Jan '01

Heh. Oh well, you win some, you lose some! I appear to be losing some - maybe I should drink less caffine? I can work around the problem for the moment, but either: 1) I *totally* misunderstand how dtml-with works 2) It's misbehaving itself under some circumstances To recap: two SQL method returning [different] (name,domain) are used like this: <dtml-in SQL_method1> &dtml-name; - POINT A &dtml-domain; <dtml-in SQL_method2> &dtml-name; - POINT B &dtml-domain; <dtml-with aFolder> &dtml-name; - POINT C &dtml-domain; </dtml-with> </dtml-in> </dtml-in> This will print: name1 domain1 name2 domain2 name1 domain1 That is: *inside* the dtml-with, the variables "name" and "domain" appear to be reset to their values in the *outer* dtml-in tag, not the innermost. This *only* happens if both SQL methods return variables named the same, and it *only* affects those two variables (so, I can work around it). Is this expected behaviour? Anyone who wants to see this problem can have Manager access to a test subtree I setup that reproduces the problem exactly. I realise it's far more likely that the problem lies with me - but what is the problem? Also - your comment about SQL methods vis. the DTML namespace has cleared up a longstanding confusion of mine - thanks! Regards, Phil +----------------------------------+ | Phil Mayers, Network Support | | Centre for Computing Services | | Imperial College | +----------------------------------+ -----Original Message----- From: Dieter Maurer [mailto:dieter@handshake.de] Sent: 10 January 2001 20:59 To: Mayers, Philip J Cc: 'zope(a)zope.org' Subject: Re: [Zope] REPOST: dtml-with doesn't work Usually, I complain that problem reports are too terse. But, your's was very big, such that I did not read it carefully. It is very difficult to get it right for everyone. Just a remark: SQL methods do *NOT* look at the DTML namespace *AT ALL*, just at REQUEST (or the expliciitly passed keyword arguments). Thus, "dtml-with", "dtml-let" and friends are all ineffective with respect to ZSQL methods. May be, that explains your problem. May be not, as I am not sure, that you need the values indeed inside a ZSQL method. I can assure you: "dtml-with" does work. Dieter _______________________________________________ Zope maillist - Zope(a)zope.org http://lists.zope.org/mailman/listinfo/zope ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope-dev )

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Re: [Zope] broken products not indicated after Zope 2.2.5 install
by Dieter Maurer 11 Jan '01

11 Jan '01

Fred Yankowski writes: > I just installed a full copy of Zope 2.2.5 onto my NT 4.0 SP 6 machine > and then copied over my data.fs* files from Zope 2.2.3. Zope 2.2.5 > comes up OK after that, but none of the Products in the Control Panel > / Products folder is shown as broken, even though I have yet to copy > over the dozen or so products that I had added onto Zope 2.2.3. Of > course, other objects that depend on those products fail and some of > those do display a "broken" icon and state. But why don't the > incomplete products themselves get flagged as broken? This may be part of a (small) Zope misfeature. If exceptions occur during some part of product registration, then Zope appears not to update the product state. I suggest, you activate Zope's logging mechanism (either through an environment variable "STUPID_LOG_FILE=file" or with an equivalent command line argument to "start"). Then restart Zope and look at the log file. If you see exceptions there, file a bug report into the Collector. Dieter

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Acquisition loops and web robots
by Andrews, Martin 11 Jan '01

11 Jan '01

I have run into several cases where authors at our site have accidentally employed acquisition to link documents in such a way that an infinite tree of URLS are possible - for example: /a/foo contains a link to "b/bar" /b/bar contains a link to "a/foo" This really causes a problem with our web indexer (htdig) hits the site and indexes pages like: /a/b/a/b/a/b/a/b/a/b/a/b ... a/foo Has anyone found a way to avoid these sort of problems - other then just not indexing zope sites? I already limit htdig with the max_hop_count setting, but that it tricky to tune correctly (and still index all valid files). Martin --- Martin Andrews mandrews(a)netgenics.com

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