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BIG ZODB - Scalability
by Mario Lang 17 Mar '00

17 Mar '00

Hi. I just got the job to find out how we (the technical university Graz) could build up a large image-database for different users.. Zope came to my mind because of its oject oriented structure. And because I'd really like to do Zope work at work :). I now have to find out how Zope can be used with really large databases. (100000 to 1mio objects theoretically in the future). Can anyone provide me with URLs or information on: The relational Database Storage Manager (couldnt find any references) (is this intented for large databases?) Or splitting the Zope hirarchy into multiple ZODB FileStorage Manager instances. SO that I could e.g. save on subfolder of the root folder in on data.fs and the next subfolder in another data.fs I am thinking of the filesize limit of some operating systems. 2GB isnt really much. I think that a FileStorage would be better for our content (images), because performance issues (never saved 20GB in an relational database before :) ) Any help is appreciated, Mario Lang <mlang(a)home.delysid.org> Technical University Graz Department Computing Services Phone +43-316-873-8508 E-Mail: lang(a)zid.tu-graz.ac.at

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Browser Detection
by Tom Scheidt 17 Mar '00

17 Mar '00

Is there a way to write a <dtml-if> for browser detection, like: <dtml-if (User Agent is Netscape 4.5)> Use this <dtml-elif (User Agent is Internet Explorer 5.0)> Use this </dtml-if> Thanks in advance. ************************* Tom Scheidt www.falsemirror.com tom(a)falsemirror.com *************************

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Re: [Zope] beginner's question: references
by Rik Hoekstra 17 Mar '00

17 Mar '00

> You mean references? We've thought about this problem a little and Jim > and I discussed this over Chinese buffet once, I obviously had less of a > clue than him, but I belive the result of our discussion is that there > should be some sort of standard for one Zope object to refer to > another. The simplest way we could think of is simply storing the > path. Such as: > > attribute = "../../relative/path/to/other/object" > > or perhaps: > > attribute = '/absolute/path/to/object' > > Then when you want the object you ask Zope to resolve that path for > you. Currently you can use REQUEST.resolve_url(attribute) to do that > for you. > > If you're not working on python you can simply set a string property as > the path. > > This is how ZCatalog does it (actually ZCatalog uses a slightly dumber > version of this concept, don't ask). HOWEVER, the lack of any kind of > standard or support for such references in the framework has bitten > ZCatalog (and webdav) in the past, and the decisions we made will > probably come back to haunt us real soon now. You have been warned. I've been asking for this sort of capability for about a year now (I even offered to cough up real money to get it in) and got nowhere. Tha last time I brought this up was in November (http://lists.zope.org/pipermail/zope/1999-November/013362.html) but I've refined what i think needs to be done a bit, bear with me because it's still a little fuzzy (I'm aware that the following proposal has some serious handwaving in it): Zope needs a new folder in the control panel (call it 'Relationships') that contains 'Relationship' objects. 'Relationship' objects come in two flavors: one-to-many, and many-to-many. you define what meta types are allowed on either side of the relationship in it. All relationships are bi-directional. ZClasses that subclass 'relationship_aware' get a new tab labeled 'Relationships', which is automatically populated with any 'Relationship' objects that it finds. appropriate 'edit' methods should be automatically generated. in the ZClass instance, Relationships should behave much the same as property sheets, except that you can traverse them to get at the properties of the objects on the other side. The trick is, the information about the relationship between two objects is not maintained in either of them, but in the 'Relationship' object instead. Example: Two Zclasses are built, called 'Book' and 'Person'. Both subclass 'relationship_aware'. an 'Author' Relationship object (many-to-many) is added to the 'Relationships' control panel folder. The 'Author' Relationship allows object of meta type 'book' on one side of the relationship, and objects of meta type 'Person' on the other. Now you go back to the 'Book' and 'Person' ZClasses, and under the 'Relationship' tab you generate add/edit methods for the 'Author' Relationship that the ZClasses can now discover. As you may have noticed, both the 'Relationships' Folder and the 'Relationship' objects it contains bear some resemblance to ZCatalog. Because we defined the 'Author' relationship to be many-to-many, 'Book's can now have multiple 'Person's associated with them and 'Person's can have multiple 'Book's. Ideally you would now be able to do this after having set the neccessary associations within the ZClass instances: from within a 'Book' index_html method: Written by: <dtml-in Author> <dtml-var name> </dtml-in> And from within a 'Person' index_html method: <dtml-if Author> <dtml-var name> has written: <dtml-in Author> <dtml-var title> </dtml-in> </dtml-if> We can elaborate on this model to allow 'Person' objects to also be associated with a 'Book' through an 'Editor' relationship, allow 'Person' objects to be associated with each other through an 'in_rolodex' relationship, etc. This approach has various advantages, not the least of which is that because neither object is responsible for maintaining the relationship information, you don't have to worry too much about what happens when one of the objects is deleted. Another is that if one object sets the association up, the object on the other side of the relationship is immediately aware of it as well (as long as it too is relationship_aware). My favorite advantage is the simplicity of the DTML that results from the named relationship being traversable. Let me know what you think, [RH]Michael, What you seem to be descibing is some sort of an internal Zope 'link base' as they exist for may hypertext systems (but zopish). This would be very useful. I do have some doubts about your desciption, however: - would the generic relationships (meta-type<->meta-type) you describe be the best way to go and whether they would turn out to be very useful. You also do not mention one-to-one relationships; I'm sure this is not on purpose, but this could be implemented quite simply by a specific python product. - I also wonder whether much of what you describe cannot also be achieved in other ways, mainly through using the Catalog (as you indicated yourself). If I may speculate a bit more on this point: what you want may be a specialized folder index method that uses a mix of its own objectValues and Catalog obtained objectvalues for its contents. If you wanted to use symlink type relations, this may be done by using properties (this is more or less generic) or by using the values of a 'link base' type of object (see above). THis last would be very specific: pointing to specific objects. - The idea of relationship aware is nice, but the drawback is that it can only be true for derived ZClasses, and not all zope objects are Zclasses. - In ZDP list many of these subjects have been in question for some time now. You may want to have a look at the list archives of last month for many of the discussions and of course the implementation of ZDP Tools by Maik Roeder (available somewhere from his member page: http://www.zope.org/Members/roeder) Rik

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mod_fastcgi
by Ryan Crum 17 Mar '00

17 Mar '00

Does anyone know of an alternative site to download the mod_fastcgi module for Apache? It seems www.fastcgi.com is not yet back online. Thanks Ryan

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External Methods and REQUEST
by Daryl Tester 17 Mar '00

17 Mar '00

Greetings, I've started having a serious fiddle with External Methods, and have run across a couple of brain issues: 1) Most examples I've seen (well, both :-) pass REQUEST as a parameter in addition to self (for example, def frobnicate(self, REQUEST)). Yet I've noticed that I can pull REQUEST out of self's namespace, and they appear identical. Is there a reason for passing in REQUEST explicitly? 2) (And if this is related to point #1, then you may beat me around the head with a Nerf bat). I defined an external method called frobnicate as follows: def frobnicate(self): "One of many test functions" return self.REQUEST.form and install it. If I call it with http://localhost/zope/frobnicate?foo=bar it returns a dictionary of {'foo' : 'bar'}, as it should. If I call it without any arguments as http://localhost/zope/frobnicate the browser hangs and eventually times out with "The document contained no data". I'm specifically interested in form data here, which is why I haven't used the REQUEST['thingo'] idiom, so I suspect I must be accessing REQUEST incorrectly. Any clues would be most welcome (if only someone could write a ZenOfZope product; I'd download it into my brain in an instant! :-) Regards, Daryl Tester

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(no subject)
by sam 17 Mar '00

17 Mar '00

How is this list different from egroups -- ########################## necessity is the mother of invention ##########################

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RE: [Zope] Zope Cookie Handling
by Pearson, Brian Edward (GEA, 056278) 17 Mar '00

17 Mar '00

I went ahead and wrote a Java helper class to convert from base 8 to base 10. This has resolved the problem. For those interested: private static String convert(String uid) { StringBuffer sb = new StringBuffer(); StringTokenizer octalString = new StringTokenizer(uid, "\\", false); Integer convert = new Integer(1); while(octalString.hasMoreTokens()) { sb.append((char)convert.parseInt(octalString.nextToken(), 8)); } return(sb.toString()); } I am still curious as to why Zope converts the data into base 8. Thanks for your response. -----Original Message----- From: Pavlos Christoforou [mailto:pavlos@gaaros.com] Sent: Thursday, March 16, 2000 10:59 PM To: Pearson, Brian Edward (GEA, 056278) Cc: 'zope(a)zope.org' Subject: Re: [Zope] Zope Cookie Handling On Thu, 16 Mar 2000, Pearson, Brian Edward (GEA, 056278) wrote: > > Upon investigation of the value contained in the UID cookie, Zope returned > the following: > \316\313\321\310\316\315\314\311\321\312\316\317\317\223\310\321\315\317\313 > \316\317' I am not sure what is going on but wouldn't it be generally safer if your java class converts the encrypted cookie in some ASCII text format first? I think that will solve your Zope problem too. Regards Pavlos _______________________________________________ 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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WorldPilot problems
by jeffr＠odeon.net 17 Mar '00

17 Mar '00

Greetings, I'm running RedHat 6.0, Zope 2.1.4, and WorldPilot 1.0.4 WorldPilot installed fairly painlessly. I'm able to log into it and can view e-mail messages. However, I get an error message ('TypeError') when I try to send a message. Also, I've noticed a couple of other small problems. When composing a message and clicking on 'save as draft', there doesn't appear to be any way to access the message to finish editing and sending it, and when you do save a message as a draft, it displays a message with instructions on how to continue the message. These intructions are rather confused, something to the effect of: "To continue continue the...". Jeff Robertson jeffr(a)odeon.net

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Inserting data into database via web page
by M. Richardson 17 Mar '00

17 Mar '00

Hi, I feel I've managed to get a grip on search query's through web interfaces, but I can't find any documentation to show me how to setup a web page that will allow me to use an sql method with the 'INSERT INTO' string so that I can insert data into my database. Can anyone offer any documentation links or tell me how to do this ? Thanks

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Zope Cookie Handling
by Pearson, Brian Edward (GEA, 056278) 17 Mar '00

17 Mar '00

All, Here is another interesting issue that I have encountered while trying to process cookies in Zope. On a different app. server I have a Java class which generates an encrypted cookie when a user logs into the site. When the user navigates over to my Zope site, I wish to check the value of the UID. I do this by retrieving the cookie within the following snippet of DTML: <dtml-if "REQUEST.cookies.has_key('UID')"> <dtml-call "REQUEST.set('cookie', REQUEST.cookies.values())"> <dtml-var "validateCookie(REQUEST, REQUEST['REMOTE_ADDR'])"> </dtml-if> This DTML calls a DTML method (validateCookie) which in turn is calling the following External Python Method: import xmlrpclib, base64 def validateUID(self, REQUEST, ipaddr): cookie = REQUEST.get('cookie') servlet = xmlrpclib.Server("http://salesnet-dev.appl.ge.com/geaservlet/X mlRpcTest") cookie = repr(cookie) cookie = cookie[2:] cookie = cookie[:-2] return servlet.validateCookie.check(cookie, ipaddr) This XML-RPC call attempts to invoke the Java decrypt method. Herein lies the problem: Upon investigation of the value contained in the UID cookie, Zope returned the following: \316\313\321\310\316\315\314\311\321\312\316\317\317\223\310\321\315\317\313 \316\317' If I print out each character created during the Java encrypt method, the following values are returned: \206\203\209\200\etc.etc. A colleague of mine pointed out that Zope was returning the values in Octal rather than decimal. Is this behavior by design? Is there another mechanism I can use to retrieve the raw cookie value before Zope places it in a dictionary? Rather than code a string parsing routine in Java, are there any suggestions as to how to convert each character back to decimal, or obtain the string prior to being converted into octal? Once again, I appreciate the assistance/responses. Everyone on this group has been wonderful to interact with. -Brian

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