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Re: [Zope-dev] Impact of additional protocols handled by Zope?
by Jeff Kowalczyk 18 Mar '02

18 Mar '02

[Eron] Yeah, this is something I'd be very interested in knowing, too. In fact, this particular ability could make or break a community project I'm going to be developing with Zope in the near future. Do you mean like the pluggable access that ZServer provides? I imagine there would also have to be some kind of pass-through backend storage to the actual service layer (like IMAP, for instance). This is definitely something I've been thinking about. [Eron] Getting my gears turning, Eron My thinking is that the protocol(s) that people might develop would be action-interfaces to Zope objects and methods. The canon example is IMAP, I guess. Someone might finish up something like http://www.zope.org/Members/michel/MyWiki/IMAPServer , and access/create/control Zope objects persisted directly in ZODB, using variations on the classes people already have for the various Zope Email Clients. Add Binari's IMAP Plug-In to the ubiquitous Outlook, and you've got a poor-man's Exchange Server*. To get public folder workflow, you'd need to use CMF (or Openflow), but that should change by the time Zope3 takes shape, workflow will apparently be native to Zope. (Can't wait) Jabber (or IRC, etc.) would be a slightly different use case. Jabber.py's maturation might mean that you could have a small number of users conferences authenticated against Zope's users. The users would use normal Jabber clients, but this should make web-chat interfaces very doable, too. A Zope Jabber protocol server might implement active conversations in session memory, and persist to Zope objects in response to a Jabber command. Jabber's logging idioms produce XML documents in the jabber.org implementation, ours would be Zope objects or whatever was needed by the developer. The back-end would be all Zope's turf. As for LDAP, existing LDAP products connect to external LDAP servers. But wouldn't it be useful if Zope's user database, and other folderish resources could be exposed as LDAP, with Zope as the server? A Dynamic DNS protocol handler could pump authenticated user's IP info into the LDAP tree, and so on. I'm probably getting ahead of myself here, its not like python implementations of these sophisticated protocols grow on trees. But they do seem to get started in the python community from time to time, and if Zope offered an easy way to hook a budding protocol implementation in to a mature application server, there might be a lot of can-do attitude to getting them beyond alpha stage. The key would be if the developer could add/delete/configure protocol products as easily as content products. As I said, It wouldn't take much for Zope to be a great Exchange drop-in replacement in your typical small business. It wouldn't really matter that much if python implementations of these protocols didn't have the scalability of their C-based brethren, lots of small Zopes doing big-server work would be a nice thing to develop against. * Better than Exchange, IMHO, because you'd have to be nuts to deploy Exchange or Small Business Manager in a real small business with no on-site IS Manager to handle backups or Active Directory admin duties.

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Replaceable types?
by Ivo van der Wijk 17 Mar '02

17 Mar '02

Hi, I'm still fighting with making my QuotaFolder work with some (imho) buggy code in Zope (mainly caused by exceptiontype-less try: except: constructs) (of course, I could patch the problems in Zope, but I'd still like my product to work without patches) The ObjectManager seems to have support for 'replaceable objects', i.e. when looking at checkValidId: if not allow_dup: obj = getattr(self, id, None) if obj is not None: # An object by the given id exists either in this # ObjectManager or in the acquisition path. flags = getattr(obj, '__replaceable__', NOT_REPLACEABLE) if hasattr(aq_base(self), id): # The object is located in this ObjectManager. if not flags & REPLACEABLE: raise BadRequestException, ('The id "%s" is invalid--' 'it is already in use.' % id) First of all, is allow_dup ever set to true? Does zope support duplicate id's in an ObjectManager anywhere at all? Secondly, can someone give me an example of a Replaceable object? Thanks, Ivo -- Drs. I.R. van der Wijk -=- Brouwersgracht 132 Amaze Internet Services V.O.F. 1013 HA Amsterdam, NL -=- Tel: +31-20-4688336 Linux/Web/Zope/SQL/MMBase Fax: +31-20-4688337 Network Solutions Web: http://www.amaze.nl/ Consultancy Email: ivo(a)amaze.nl -=-

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Re: typo in HTTPResponse.py
by Evan Simpson 17 Mar '02

17 Mar '02

Christian Theune wrote: > Hmm. Is it possible to implement some option to turn this off? I just checked in the ability to use HTTP_TRACEBACK_STYLE to control the appearance of tracebacks in non-debug mode errors: '' (default): Place it in an HTML comment 'none': Omit it 'plain': Include it as plain text just as in debug mode. 'js': Show a § that expands into the traceback when clicked. Cheers, Evan @ Zope

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Multiple Database Connections Same Zsql method
by senkr 16 Mar '02

16 Mar '02

Is it possible to iterate though multiple databases with the same zsql method? Have multple identical databases with different data. Want to maintain only one method. Can i do this in DTML or do I have to use pythonscripts? I guess what I want to do is to have the query in one folder, call it from another folder and pass the database connection info to it. Not sure how well this would work with multiple users though....... Any advice is appreciated.

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Small Alert
by Jean-Paul Smets 16 Mar '02

16 Mar '02

Hi, I just upgraded this morning a Debian Woody server with Zope 2.5. The upgrade has resulted in all my CMF (which use SiteRoot or VirtualHostMonster) to refuse any authentication. Without SiteRoot or VirtualHostMonster, everything is fine. I am searching the reason. JPS.

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Zope crashes: Tim Peters reports potential problem
by Dieter Maurer 15 Mar '02

15 Mar '02

Tim Peters reports on "comp.lang.python": > [Martin v. Loewis] > > The garbage collector runs while having the GIL, so it does not need > > to be thread-safe. > > There's still a vulnerability here: gc *assumes* the GIL is held when > _PyObject_GC_Malloc gets called, and doesn't verify that the GIL is in fact > held. A rogue extension module could violate this precondition without > triggering a predictable error (and then "random" segfaults would be > likely). Maybe, we should check for this, too. Dieter

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Bug days
by Brian Lloyd 15 Mar '02

15 Mar '02

Hi all - In an effort to better keep up with the collector, I'd like to throw out the idea of doing periodic "bug days" (a la the mozilla bug days), where Zope geeks and committers would get together on IRC and spend a few hours knocking out issues. I've drafted a preliminary bug day manifesto that describes how it would work in a little more detail: http://dev.zope.org/CVS/BugDays I'd like to hear what people think, as well as work out a few logistics: - Given the wide geographic area that committers (and patch submitters) cover, what is a good time of day for a bug day to start / end (where start and end are always going to be fuzzy, of course). - Would it be better for bugdays to be ad-hoc, or should we try to set up regularly-scheduled bugdays at some reasonable interval? If the latter, we need to come up with a day / time that is agreeable to as many of the committers as possible. Thoughts? -Brian

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Modifying a menu
by Marcia Perry 15 Mar '02

15 Mar '02

Hi, Where in the Zope src is the menu labeled "Select type to add..." created? We want to change this pulldown menu but I'm not familiar w/ the Zope src code. I started w/ the obvious: after pointing my browser at http:// myhost:8080/manage and getting the Zope page, I did Netscape -> View -> Page Source and see the 3 frames. I think the menu I'm interested in is in the frame w/ src="http://myhost:8080/manage_workspace" w/ name= "manage_main". So I searched thru. the src, grep'ng for some strings and located "manage_main" in ZopePageTemplate.py. But that's as far as I got. I'm new to Zope, don't have time to step thru. all the code, but gotta dive in and make some changes to this menu. Please help! And if there's some documentation that describes the code, I'd be stoked. Thanks, -- marc ---------------------------------------------------------------- Marc Perry MPerry(a)lbl.gov Lawrence Berkeley National Laboratory WORK# (510) 486-6786 1 Cyclotron Road FAX# (510) 486-6363 Berkeley, CA 94720 MS: 50A-3111

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Re: [Zope-dev] more on the segfault saga
by Anthony Baxter 15 Mar '02

15 Mar '02

>>> Dieter Maurer wrote > Just a wild guess: is the GC guaranteed to be thread safe? Yep. The GC is _almost_ certainly not the problem here - it's just that the GC is the poor bunny that has to walk through the objects in memory. So when something's been mangled, the GC is the thing that falls over and breaks. I think I've mentioned it before, but looking at the object _before_ the corrupted one in memory might be a useful thing to try... Anthony -- Anthony Baxter <anthony(a)interlink.com.au> It's never to late to have a happy childhood.

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Marshalling of records in REQUEST.form
by Jean Jordaan 14 Mar '02

14 Mar '02

Hi all I've just noticed this. In my form I have, for example: <input name='HostType:list' value='Sequential'> <input name='properties_to_show.ContactPerson:list' value='ContactName'> <input name='properties_to_show.ContactPerson:list' value='DirectEmail'> <input name='properties_to_show.Customer:list' value='CustomerName'> <input name='properties_to_show.Customer:list' value='CustomerStatus'> When I log this after submission, I see: {'HostType': ['Sequential'], 'properties_to_show': ContactPerson: ['ContactName', 'DirectEmail'], Customer: ['CustomerName', 'CustomerStatus']} In other words, not a valid dictionary. As a valid dictionary, that would be: {'HostType': ['Sequential'], 'properties_to_show': {'ContactPerson': ['ContactName', 'DirectEmail'], 'Customer': ['CustomerName', 'CustomerStatus']}} Is a bug or a feature? Is the reason for the representation the fact that 'properties_to_show' is a record, and not a dictionary? -- Jean Jordaan Upfront Systems http://www.upfrontsystems.co.za

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