[OpenAFS] Re: [OpenAFS-devel] exposing RPC code<->name mappings via rxgen extension, a library, and a new utility

Wed, 6 May 2009 15:05:39 +0200 (CEST)

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Attached is my suggestion for a functional translation mechanism.
This patch contains my original changes towards generation of lookup 
tables and Steven's translate_rpc.patch.

A proof of concept implementation is already running in DESY's OpenAFS+OSD 
test cell.

Is this conceptionally sound?

  - Felix

On Wed, 6 May 2009, Felix Frank wrote:

> On Tue, 5 May 2009, Steven Jenkins wrote:
>
>> I'm glad you revived this thread.  Some time ago I started a similar
>> implementation for this that leverages the output from rxgen.  The
>> translate_rpc mechanism just does a simple string or numeric match
>> (and I can't seem to find that at the moment, so I may not have
>> written anything beyond a throw-away program...).
>
> That'll be straight forward, yes. I'll look into it.
>
>> rxgen can be told to dump out its data definitions (via the -h
>> option), which looks like it will do almost everything we need in
>> terms of collecting the data.   I've attached the patch of what I
>> hacked up in the rxgen source, but I actually don't think it's
>> necessary.
>
> Isn't that -x? "Not necessary" - are you implying your patch was gratuitous?
> Which I wouldn't deem true.
>
>> The one problem I hadn't decided how to handle is that two of the Rx
>> IDL specifications overlap (FS and CM, if I recall correctly), so that
>> needs to be resolved.
>
> Does it? Won't the translate functions retain the package prefix? I thought
> there might be going to be one for each interface. Or should callers not be
> required to know what package they are talking about?
>
> The only user in the immediate future will be RxOSD's fs and osd, which need 
> only translate fileserver and rxosd operations respectively,
> for example.
>
>> I think it's probably only a little more work to get this to a usable
>> state.  Even if the -h output won't quite work, the hacking I started
>> in rxgen (or the changes you've started) could be leveraged.
>> 
>> Also, note that I don't think the gperf approach is necessary for the
>> first implementation.  We're only looking at a few hundred RPCs, so
>> the search time, even though O(n), will be fairly fast.  If someone
>> finds a need to do a repeated programmatic use of the table, then we
>> could add a better hashing function at that time.
>
> On Tue, 5 May 2009, Jeffrey Hutzelman wrote:
>
>> --On Tuesday, May 05, 2009 10:12:49 AM +0200 Felix Frank 
>> <Felix.Frank@Desy.de> wrote:
>> 
>>> Is that about what you had in mind?
>>> Further suggestions/criticism?
>> 
>> Hm?  For number->name mapping, the right thing is to _generate a function_ 
>> which works exactly like the ExecuteRequest function that rxgen already 
>> generates, except that instead of calling a server RPC implementation, it 
>> returns a (static) string containing the procedure name.
>
> I fully agree. Steven suggested that the inverse translation should
> work the same way, which would be much to my liking as well.
>
>> At first glance, the patch you included does appear to generate a table 
>> like the one I was describing.  No, I wouldn't feed these into gperf or 
>> modify rxgen or any other component to use gperf.  My point was to use them 
>> as input to a tool analogous to /afs/cs.cmu.edu/user/jhutz/scripts/error, 
>> which is a perl script that parses a directory of com_err tables to 
>> translate an error code or name:
>
>> ]] [jhutz@minbar ~] 3> error 101
>> ]]         101          ENETUNREACH
>> ]]   Network is unreachable
>> ]]         101          VSALVAGE
>> ]]   volume needs to be salvaged
>> ]]
>> ]]
>> ]] [jhutz@minbar ~] 4> error VNOVOL
>> ]]         103          ECONNABORTED
>> ]]   Software caused connection abort
>> ]]         103          VNOVOL
>> ]]   volume does not exist / did not salvage
>> ]]
>> ]] [jhutz@minbar ~] 19> error krb5.7
>> ]] -1765328377 krb5.7   KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN
>> ]]   Server not found in Kerberos database
>> 
>> The tables aren't large enough for it to be worth doing anything fancy; 
>> just slurp them all in and look for what you're looking for.
>
> So the consesus is to
> - generate very simple translation functions and
> - generate lookup tables and branch off a proper script to parse them?
>
> Thanks for all the input
> - Felix
> _______________________________________________
> OpenAFS-devel mailing list
> OpenAFS-devel@openafs.org
> https://lists.openafs.org/mailman/listinfo/openafs-devel
>
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