January 2001 - Zope-Dev

ZPatterns: wanted: alpha testers for RemoteRack
by Steve Alexander 19 Jan '01

19 Jan '01

I've written a class called RemoteRack. It works just like a ZPatterns Rack, except that the BTree it uses internally for storing its persistent data can be anywhere else in the ZODB. I'm using it in a FileStorage-based application where I want to have the application's persistent data stored in separate FileStorage data-file than the application objects. This should allow me to upgrade the application to a new version, whilst preserving the application data, by just dropping in a new application FileStorage datafile. I intend to release RemoteRack as part of the next version of DataSkinAddons. However, I'd like a volunteer or two to test it first. Any volunteers? -- Steve Alexander Software Engineer Cat-Box limited http://www.cat-box.net

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MountedFileStorage
by Steve Alexander 19 Jan '01

19 Jan '01

I've just been trying out the MountedFileStorage product (by Anthony Baxter) with Zope 2.3. I've got it mostly working, by patching a couple of typos, and making the SubApplication class derive from Traversable before Application. I've *almost* got ZClasses defined in the root storage working in a mounted storage, but there are still a few issues there. What product is DC using for the mounted storages on zope.org? Can I get a copy of it? I don't see any undo records for objects in the mounted storage. It is a FileStorage, so I reckon they should be there. -- Steve Alexander Software Engineer Cat-Box limited http://www.cat-box.net

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skinscript and URL traversal question
by Aaron Payne 19 Jan '01

19 Jan '01

Hi all, I originally posted this to the zope list and, upon suggestion, I am reposting it to zope-dev. I'm using a zsql method in a skinscript with query ... compute ... and it mostly works. Retrieving the dataskin with getItem() works. For example, Cid is the id of the coupon dataskin. <dtml-with "getItem(Cid)"> <dtml-var couponattributes> </dtml-with> Trying to access the object directly through URL traversal fails. http://CouponSite/CouponManager/977931214.694/CouponDetails Where: CouponManager is a specialist 977931214.694 is the id of the coupon dataskin CouponDetails displays the coupon attributes with: <dtml-var couponattributes> It returns a not found error. The CouponManager specialist can't find the coupon 977931214.694. Any thoughts why this is so? SkinScript Trigger: WITH QUERY searchByNameCheck(self.id) COMPUTE name,username,coupon_text,categorylist,categoryheader,expirationdate,status,couponterms PythonMethod: searchByNameCheck <params>self,name<params> Cname=name result=self.searchBy_Name(name=Cname) #zsql method return result Error Type: NotFound Error Value: None Traceback (innermost last): File /usr/local/etc/Zope2d/lib/python/ZPublisher/Publish.py, line 222, in publish_module File /usr/local/etc/Zope2d/lib/python/ZPublisher/Publish.py, line 187, in publish File /usr/local/etc/Zope2d/lib/python/Zope/__init__.py, line 221, in zpublisher_exception_hook (Object: ProviderContainer) File /usr/local/etc/Zope2d/lib/python/ZPublisher/Publish.py, line 162, in publish File /usr/local/etc/Zope2d/lib/python/ZPublisher/BaseRequest.py, line 338, in traverse File /usr/local/etc/Zope2d/lib/python/Products/ZPatterns/Specialists.py, line 25, in __bobo_traverse__ (Object: ProviderContainer) NotFound: (see above) Zope version: Zope 2.2.1 (source release, python 1.5.2, linux2) System Platform: freebsd4 -thanks, Aaron

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ZCatalog doesnt find Items
by Andre Schubert 19 Jan '01

19 Jan '01

Hi all, I have a problem with my ZCatalog object. If i have a Folder named Test and inside i create a ZCatalog object and some DTML-Objects/Methods the ZCatalog finds all Items. But when i install the ZCatalog in the root folder and start find Items a got the following error: Traceback (innermost last): File /usr/share/zope_2.2/Zope-2.2.0-src/lib/python/ZPublisher/Publish.py, line 222, in publish_module File /usr/share/zope_2.2/Zope-2.2.0-src/lib/python/ZPublisher/Publish.py, line 187, in publish File /usr/share/zope_2.2/Zope-2.2.0-src/lib/python/Zope/__init__.py, line 221, in zpublisher_exception_hook (Object: Traversable) File /usr/share/zope_2.2/Zope-2.2.0-src/lib/python/ZPublisher/Publish.py, line 175, in publish File /usr/share/zope_2.2/Zope-2.2.0-src/lib/python/Zope/__init__.py, line 235, in commit File /usr/share/zope_2.2/Zope-2.2.0-src/lib/python/ZODB/Transaction.py, line 290, in commit AttributeError: (see above) Are there some known conflicts with other Products?? I use Zope 2.2.2 and python 1.5.2 on Linux(i386) Who can help me as

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Arguments without values
by Chris Withers 19 Jan '01

19 Jan '01

Hi :-) Can anyone tell me why this URL: http://localhost:8080/mymethod?edit ...doesn't result in: REQUEST['edit']=None ...which is what I'd expect. What actually happens is that edit doesn't appear in REQUEST at all :-( Where should I look to fix this? cheers, Chris

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Specialists and __bobo_traverse__
by Roch'e Compaan 18 Jan '01

18 Jan '01

I'm still lost as to when __bobo_traverse__ is checked for object traversal and when not. I have very simple piece of SkinScript: WITH SELF COMPUTE __bobo_traverse__ = traversal_method. Looking at the traverse method in BaseRequest.py it looks to me as if an object is always checked if it has a __bobo_traverse__ method but this is not what is happening. If I manually type in a url, say path.to.specialist/dataskin1, where dataskin1 exists, my traversal_method is not called. When I type in path.to.specialist/dataskin2, where dataskin2 does not exist then my traversal_method is called. Noticing that the traversal_method is called when an object can not be found I tried path.to.specialist/dataskin1/dataskin2, where dataskin1 is in the specialist's rack but dataskin2 is in another specialist's rack and will therefor not be found. In this case my traversal_method was not called. If it was then I could retrieve it from the appropriate specialist. I hope the above is clear because I'm somewhat desperate at the moment. If I'm trying the impossible, a simple "forget about it" will also do. Roché

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ZPatterns: Attribute Providers
by Steve Alexander 18 Jan '01

18 Jan '01

Here's my understanding of how Persistent Attribute Providers work: Persistent Internal Attribute Provider DataSkins and Attributes are ultimately stored like this: Rack's BTree | | | Slots: key:value | |-('ZPatterns.Rack','Self') : DataSkin instance ...which has the attribute __dict__ containing its attributes {'id':object_id, 'foo':value for foo, 'bar':value for bar} Persistent External Attribute Provider Rack's BTree | | | Slots: key:value | |-('ZPatterns.Rack','Self') : DataSkin instance | ...which has the attribute __dict__ | containing 'id':object_id |-foo:value for attribute foo |-bar:value for attribute bar The key ('ZPatterns.Rack','Self') is the special SelfKey that racks use to ensure there is a unique place in a slot to put the slot's object. Do I have this right? -- Steve Alexander Software Engineer Cat-Box limited http://www.cat-box.net

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Re: [Zope-PTK] Fw: PythonMethods and ZClass generation problem
by Alexander Limi 18 Jan '01

18 Jan '01

From: "Shane Hathaway" <shane(a)digicool.com> > You were *SO* close. :-) > > I think you want this: > > return self.artists.manage_addProduct['Artist'].Artist_add(_.None,_) > > to be like this: > > return > self.artists.manage_addProduct['Artist'].Artist_add(_.None,_,REQUEST) Tried both of those already. When testing it, and Artist_add contains nothing but "<dtml-var REQUEST>" (so nothing else can be wrong), I get: KeyError: REQUEST and the traceback looks like this: File <string>, line 41, in registerartist (Object: ApplicationDefaultPermissions) File /usr/local/zope/lib/python/OFS/DTMLMethod.py, line 168, in __call__ (Object: Artist_add) File /usr/local/zope/lib/python/DocumentTemplate/DT_String.py, line 528, in __call__ (Object: Artist_add) KeyError: (see above) Thanks for you suggestions so far, Alexander.

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Q: how to retrieve transactions from a Data.fs fragment?
by Shawn Murphy 18 Jan '01

18 Jan '01

Yes.... We experienced a nasty confluence of suprises: - CanOfRaid is imperfect, - reiserfsck is imperfect, - our backups were imperfect [We already knew we were imperfect.] The result is that all we have left of about 6 weeks of several peoples development effort is two Data.fs scraps recovered from a reiser fs by one of the reiser developers. We also have an intact 2 month old Data.fs which we would like to update with whatever we can retrieve from these two scraps. Fragment#1 is 187MB where the first 147MB is nothing but nulls and the remainder is stuff that satisfies a tranalyzer rigged to not gag because of the missing leading 'FS21'. The offsets within Fragment#1 are all correct. That is, each transaction at the location in the file it thinks it ought to be. Fragment#2 is 600KB and has about 500K of nulls at the beginning. I am not yet sure if the offsets are 'proper' in it. I presume that these nulls are artifacts of the restoration process from the reiserfs. So my question is: What is the best strategy for getting the Folders, DTML Methods, DTML Documents and ZSQL Methods contained in these Data.fs fragments safely back into production? Just to get the ball rolling.... I have a done a evening's worth of experimenting with tranalyzer to evaluate the state of these fragments and explore strategies for getting their contents back into service. It seems that it will not work to simply append these zope transaction records to the end of a Data.fs because these transaction records have offset data built into them (the backpointer). Some form of any of the following could get the job done, but which one? Is there some better approach? An existing tool? Guru wisdom appreciated... Plan 1 ====== Simply massage the data so it has the right offset values and then tack it on the end of the old Data.fs. Cons: What will happen with transactions which are edits of missing objects? Plan 2 ====== Have the data drive a program which interacts with a running ZODB and replays the transactions. Several ways to do this come to mind... a) write an http client to perform the operations against a normal, running Zope b) write a tool which uses FileStorage.py to read the frag and write to the clean Data.fs Plan 3 ====== Make a human readable form suitable for cut and pasting into zope via the regular management screens. Cons: - Final refuge of the damned because of the redundancy of the data in Data.fs, each update being present... - Besides, it just isn't "lazy" enough. ==================================================================== Shawn Murphy Research and Development mailto://smurp@emergence.com Emergence by Design work://1.780.413.6397 http://www.emergence.com

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Fw: PythonMethods and ZClass generation problem
by Alexander Limi 18 Jan '01

18 Jan '01

Sorry if I'm overstepping any bounds here, but I tried posting this to the main list, but the answers I get do not help me. I figured maybe somebody on the PTK- or the Dev-list might be able to help. This is a bit of a crisis, since our site has been down for a week due to this problem. I also discovered that Zope 2.3 has PythonScript which has the "context" object. Would this be of any help in the following problem? Just a thought. This is my original posting: > Hi, > > We recently decided to use LoginManager for authentication on our site, and > refactored our user registration methods to use PythonMethods instead of > DTML. > > Now, during the registration of a user, we want to add a ZClass instance > in the correct folder. This object is a representation of some of the > information the user provides when he registers with us. > > But we have stumbled across a problem. This is probably a very basic and > simple problem, but I couldn't find any info on it on zope.org, and none of > the people on IRC could help us either. So I'll try this posting instead. :) > > What we're trying to do is to add a ZClass instance/object programmatically > from a PythonMethod. Our constructor is called Artist_add, and resides in > our product "Artist". The constructor uses variables > that we have set in the REQUEST object. > > So the process is like this: > > User fills out form with variables that are put in REQUEST > | > Form calls "registerartist", which is a PythonMethod > | > "registerartist" creates the user > | > "registerartist" tries to call the constructor of our Artist ZClass to add > an Artist object in our "artists" folder, but fails. > > To add the Artist object we tried to call the constructor in the following > way from "registerartist": > > return self.artists.manage_addProduct['Artist'].Artist_add(_.None,_) > > but then the REQUEST object was not available, and the object creation fails > since it can't find the variables it needs. The traceback for this was: > > File <string>, line 41, in registerartist (Object: > ApplicationDefaultPermissions) File > /usr/local/zope/lib/python/OFS/DTMLMethod.py, line 168, in __call__ (Object: > Artist_add) File /usr/local/zope/lib/python/DocumentTemplate/DT_String.py, > line 531, in __call__ (Object: Artist_add) IndexError: (see above) > > > > So we tried a different approach: > > return self.artists.manage_addProduct['Artist'].Artist_add(_.None,REQUEST) > > This solved the problem with REQUEST not being available, we can view its > variables now, but now we can't > access Artist.createInObjectManager. The error message we get is: > "NameError Artist". > > So, I guess the question is: how can I add a ZClass instance > programmatically from a PythonMethod based on data in the > REQUEST object? > > Additional version info: > Zope 2.2.4 > PythonMethod 0-1-7 > LoginManager 0-8-8b1 > ZPatterns 0-4-3b1 > DataSkinAddons 0-0-2 > Membership 0.7.8 > > > > Thanks in advance, > > > Alexander.

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