January 2002 - Zope-Dev

Re: [Zope] [Bug] "bobobase_modification_time" unreliable to catalog
by Casey Duncan 07 Jan '02

07 Jan '02

This behavior is logical if unintuitive. I propose that we can kill two birds with one stone to fix this: - Add a new method perhaps: getModificationTime() to the API of SimpleItem or even Persistent that returns the ZODB modification time or if the object has been changed, but not yet commited, the current date/time. - Deprecate bobobase_mod_time and perhaps even omit it entirely from Zope3. This will fix the aforementioned bug and get rid of an API anachronism. Thoughts? -Casey --- Dieter Maurer <dieter(a)handshake.de> wrote: > I just discovered that the value cataloged for > "bobobase_modification_time" > is often wrong: > > The cataloged value is not the time of the > current modification > but that of the previous modification. > > I expect that this is because > "bobobase_modification_time" is updated > when the transaction is commited while the values > to be cataloged > are determined before the commit. > > Do not trust the cataloged > "bobobase_modification_time"! > > > 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 ) > > __________________________________________________ Do You Yahoo!? Send your FREE holiday greetings online! http://greetings.yahoo.com

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RE: [Zope-dev] PDF-specific Bug in the ZServer implementation??? Or just strange behavoiur of IE?
by sean.upton＠uniontrib.com 07 Jan '02

07 Jan '02

Acrobat uses something called byte-serving, which is a pain to support sometimes on the server-side, because it essentially amounts to serving parts of a file up to a given byte offset; when Acrobat acts as an HTTP client, it requests the PDF file, and once it has enough of the top of the doc to get header info from the file, it is able to omit downloading the whole thing and request portions of the file between 2 byte offsets, which represent the start and end of a page, as part of the http request. Byte-serving, unfortunately is not implemented in all http servers (or is broken in some, i.e. Apache 1.3.14). I'm not sure what the story for ZServer is, but I am curious to find out if there have been any developments in this regard... More info in the IETF RFC for HTTP 1.1: http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.12 Sean -----Original Message----- From: Joachim Werner [mailto:joe@iuveno-net.de] Sent: Monday, January 07, 2002 12:28 PM To: zope-dev(a)zope.org Subject: [Zope-dev] PDF-specific Bug in the ZServer implementation??? Or just strange behavoiur of IE? Hi! This is my first post in the new year, so best wishes for 2002 from Germany! And on we go with my problem: I have a ZClass-based Class derived from File. It holds PDF documents. SOME (not all) of them do not auto-open in Acrobat Reader as they are supposed to if MS IE 5.x is used. Opera etc. seem to work. The files themselves are o.k., and opening in Acrobat Reader AFTER downloading (via right mouseclick/save as) works fine, too. If the same document that doesn't auto-open when downloaded fom the Zope server is downloaded from plain Apache, it works ... The configuration is Zope 2.4.1 (binary release, python 2.1, linux2-x86), python 2.1.0, linux2 on a SuSE Linux with Apache as Proxy server (via proxy_pass). I checked the HTTP header with WGET, and they are identical for working and non-working PDF docs. The mime type is set to application/pdf ... Any hints on that? Joachim _______________________________________________ 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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Testers needed for z2.py security patch
by Matt Behrens 07 Jan '02

07 Jan '02

I've made a security patch for Zope 2.5.0b3 that addresses the setuid startup issues on UNIX and plan to backport it to 2.4.4 (?) and 2.3.3 once I get some positive reports. Only UNIX users need apply this patch. Windows may well have similar issues but I have no clue how to fix them. Please check it out and let me know how it works on your system, or if any clarifications are needed.

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[Fwd: Does anyone know how to suppress display of +/- signs on a dtml-tree?]
by Craeg K. Strong 07 Jan '02

07 Jan '02

I would like to answer my own question (see below). According to ZOPE/lib/python/TreeDisplay/TreeTag.py, there is no way to suppress the display of the + or - signs. However, there certain parameters to __init__ that have been commented out: # opened_decoration = None, # closed_decoration = None, # childless_decoration = None, which suggests that either there was a way to control this at one time, or that it is functionality that is planned for the future. What is the plan for this in Zope 2.5? I could prepare a quickie patch if you guys don't have the time. Please advise, thanks! --Craeg ] I want to display a dtml-tree always expanded, with no controls visible ] for contracting (basically, an indented list of links). ] I set the tree to always expand via the following: ] <dtml-call expr="REQUEST.set('expand_all', 1)"> ] <dtml-tree single=0 name="catalog" branches="objectValues"> ] But I can't figure out how to remove the little minus signs (-) from the ] branches. ] Has anyone done this? ] TIA, ] --Craeg

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Delete or move - who can tell?
by Tom Bech 07 Jan '02

07 Jan '02

Hi! Is there really no way for an object to know wether a call to manage_beforeDelete is the result of a delete or a move operation? I've tried to override _notifyOfCopyTo and setting an internal variable based on the op parameter, but alas it's not called when moving the parent... I have another class of objects which must not be cloned (sitewide unique) and I have overridden _CanCopy to avoid this, but again it's simply ignored when the parent is cloned... Any suggestions? Tom

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Yay! :-)
by Chris Withers 07 Jan '02

07 Jan '02

Hey! Who sneaked the fix that lets you customise error messages for unauthorised exceptions into Zope 2.5? Well, whoever it was, a HUGE thankyou for fixign what was quite a nasty little wart... ...now if we could only get rid of that nasty appended traceback, my world would be a happy place :-) cheers, Chris

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Broken link on your website
by Adam Brett 07 Jan '02

07 Jan '02

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separate mailing list for ZPublisher-only apps (ZPub + cgi + apache)
by Michael Olivier 07 Jan '02

07 Jan '02

I'd like to form (or join) a separate mailing list for ZPublisher-only apps. I know there are zope developers like me who use ZPublisher + FastCGI (or whatever) + apache (or whatever) to run a web site. I know we would not have the benefit of some of the expertise here, but the flip side is we would get more discussion for our flavor of zope use. Most of the discussion here is about the full Zope which is a lot to wade through for the occasional helpful tidbit. If you are interested in such a mailing list, please drop me an email. thanks, Michael

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_ (underscore) variable available in ZPublisher-only apps?
by Michael Olivier 06 Jan '02

06 Jan '02

Is the _ variable available to ZPublisher-only apps (not full-up zope) in DTML? I've tried <dtml-var "_"> (inserts nothing) and <dtml-var "_.REQUEST"> (AttributeError exception on REQUEST) and various other things, but haven't found anything to work. Would be nice to have access in DTML to the request's namespace. thanks, Michael

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References, persistence, BTrees
by Jeffrey P Shell 06 Jan '02

06 Jan '02

I'm experimenting with an event notification service based on a publish-subscribe model for some projects I'm working on. When a subscription comes in, a 'Subscription' object is made, that basically looks like this: class Subscription(Base): def __init__(self, subscriber, eventType, filter=None): self.subscriber = subscriber self.eventType = eventType self.filter = filter def __hash__(self): return hash(self.subscriber) & \ hash(self.eventType) & \ hash(self.filter) 'subscriber' is a reference to the subscribing object, and it's very likely to be to an object in the ZODB. Is it wise to have more than one persistent reference to a single persistent object? I swear that I had once heard Jim say (vocally) that you could do references like this in the ZODB now. I'm trying to avoid using Paths because objects have a tendency to move around[*], and I have performance concerns for a single event service object to have to call 'unrestrictedTraverse' to every subscriber. [*] (it's due to the annoyances with manage_beforeDelete() and friends that I'm writing this tool.) Second question: If I use the hash of the Subscription as a key, is there any advantages/disadvantages with using an IOBTree to hold Subscription objects instead of a PersistentMapping? Jeffrey P Shell, jeffrey(a)cuemedia.com

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