Re: [Qemu-devel] [PATCH] full introspection support for QMP

[Eric Blake]

On 07/02/2013 11:01 AM, Paolo Bonzini wrote:
>>> Arguably that rule of thumb would apply equally to the QEMU
>>> build scripts which already parse qapi-schema.json. It could
>>> be possible to normalize qapi-schema.json somewhat to remove
>>> this 2-stage parsing if we went down this route.
>>
>> Indeed, I wouldn't mind a one-time pass over qapi-schema.json to make it
>> follow a more rigid format if that made it easier to use it as-is with
>> less post-processing.  It won't be very nice to backport such a
>> conversion, but I don't know how much distros are planning on
>> backporting introspection in the first place.
> 
> How would the schema look like after this "one-time pass"?
> 
> This:
> 
>> [
>>          { "name": "protocol",
>>            "type": "str" },
>>          { "name": "fdname",
>>            "type": "str" },
>>          { "name": "skipauth",
>>            "type": "bool",
>>            "optional": true },
>>          { "name": "tls",
>>            "type": "bool",
>>            "optional": true }
>> ]
> 
> Looks quite awful for a human to write and read.

Which puts us back in favor of my original argument that keeping
qapi-schema.json compact for human use, while expanding the QMP output
to be verbose for machine use, is probably what we'll have to live with.
 While it is easy to document shortcuts that the qapi parser can use
when converting .json to code, it is harder to require that all other
QMP clients must implement those same shortcuts, instead of having
things already directly represented.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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