[occi-wg] Syntax of OCCI API

[Alexander Papaspyrou]

+1

We should stick to the semantics and get them clear, not so much on  
the concrete rendering.

-Alexander

Am 17.04.2009 um 11:02 schrieb Andre Merzky:

> Once we get the noun/verb/attribute part settled, there is
> no harm in doing an ini and a key/val binding.  In fact, a
> translator would be trivial...
>
> You can argue endlessly about the better format: there are
> too many PROs and CONs for both of them to come to an
> conclusive answer, IMHO.
>
> My $0.02, Andre.
>
>
> Quoting [Chris Webb] (Apr 17 2009):
>>
>> Sam Johnston <samj at samj.net> writes:
>>
>>> but in any case INI files are
>>> simple, standard across platforms, well defined, etc.
>>>
>>> You can parse them in shell like
>>> this<http://www.debian-administration.org/articles/55#comment_24>
>>> :
>>>
>>> #!/bin/sh
>>> [ -z "$1" ] || [ -z "$2" ] && exit 1
>>> sed -e 's/[[:space:]]*\=[[:space:]]*/=/g' \
>>>    -e 's/;.*$//' \
>>>    -e 's/[[:space:]]*$//' \
>>>    -e 's/^[[:space:]]*//' \
>>>    -e "s/^\(.*\)=\([^\"']*\)$/\1=\"\2\"/" \
>>>   < $1 \
>>>   | sed -n -e "/^\[$2\]/,/^\s*\[/{/^[^;].*\=.*/p;}"
>>
>> You've completely missed the point again. (Perhaps understandably,  
>> since
>> you're not in the target audience for this format.)
>>
>>  while read K V; do FOO; done
>>
>> is something you can type in a shell one-liner, which is the most
>> interesting 'use case' (sorry, horrible jargon!) for shell people.  
>> This
>> complex hack is not, and I note that you had to google for it  
>> rather than
>> writing it off the top of your head, which should have been enough  
>> to make
>> the point clear. (Incidentally, it doesn't get INI quoting right.  
>> Doing it
>> correctly and allowing for backslash escapes is somewhat harder.)
>>
>> Whitespace separated KEY VALUE is better-defined than INI[1], can  
>> be parsed by
>> shell read, by C strtok() or strsep(), and is generally pleasant to  
>> work
>> with in languages without sophisticated string handling or data  
>> structures.
>> Here's your sample translated to that format:
>>
>>  id decca5a5-8952-4004-9793-cdbbf05c3c63
>>  category server
>>  title Debian GNU/Linux 5.0 Virtual Appliance
>>  summary Base installation of Debian GNU/Linux 5.0
>>  content.cpu 2
>>  content.memory 4Gb
>>  link.disk[0].id 4696b561-a253-42b4-bd27-7aa4950e0a60
>>  link.disk[0].dev sda
>>  link.network[0].id 45a73b80-c957-4ae1-97c6-b70652eba1d1
>>  link.network[0].dev eth0
>>  mc.state RUNNING
>>  br.meter.rate 0.10
>>  br.meter.currency USD
>>  br.meter.unit hours
>>  br.meter.total 35.27
>>  pm.monitor.cpu 75.2
>>  pm.monitor.mem 1059374258
>>  mc.ops.start http://example.com/decca5a5-8952-4004-9793-cdbbf05c3c63/ops/start
>>  mc.ops.stop http://example.com/decca5a5-8952-4004-9793-cdbbf05c3c63/ops/stop
>>  mc.ops.restart http://example.com/decca5a5-8952-4004-9793-cdbbf05c3c63/ops/restart
>>  mc.ops.suspend http://example.com/decca5a5-8952-4004-9793-cdbbf05c3c63/ops/suspend
>>
>>  id 4696b561-a253-42b4-bd27-7aa4950e0a60
>>  category storage
>>  content.size 148251374
>>  link.self virtual-disk.vmdk
>>
>>  id 45a73b80-c957-4ae1-97c6-b70652eba1d1
>>  category network
>>  content.vlan 4095
>>  content.dhcp true
>>  content.subnet 192.168.0.0
>>  content.netmask 255.255.0.0
>>  content.gateway 192.168.0.1
>>  vnd.com.cisco.cdp true
>>
>> I'll not comment on the key space or conflation of objects into one
>> namespace with a category key in this post.
>>
>> Cheers,
>>
>> Chris.
>>
>> [1] See http://en.wikipedia.org/wiki/Initialization_file for  
>> details on some
>> of the variation seen in the wild. There's no formal spec to  
>> disambiguate.
>> _______________________________________________
>> occi-wg mailing list
>> occi-wg at ogf.org
>> http://www.ogf.org/mailman/listinfo/occi-wg
>
>
>
> -- 
> Nothing is ever easy.
> _______________________________________________
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> occi-wg at ogf.org
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-- 
Alexander Papaspyrou
alexander.papaspyrou at tu-dortmund.de

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