Re: [Qemu-devel] [PATCH v2 2/2] full introspection support for QMP

[Amos Kong <akong@redhat.com>]

On Tue, Jul 16, 2013 at 01:08:55PM +0200, Paolo Bonzini wrote:
> Il 16/07/2013 13:04, Amos Kong ha scritto:
> >>> > > So here I defined a 'DataObject' type in qapi-schema.json,
> >>> > > it's used to describe the dynamical dictionary/list/string.
> >>> > > 
> >>> > > { 'type': 'DataObject',
> >>> > >   'data': { '*key': 'str', '*type': 'str', '*data': ['DataObject'] } }
> >  
> > Hi Paolo,
> > 
> >> > This is missing '*optional': 'bool'.  Also, how do you distinguish these:
> >> > 
> >> >   { 'command': 'query-tpm-types', 'returns': 'TpmType] }
> > do you mean 'TpmType' ? not 'TpmType]
> 
> Yes.
> 
> >         {
> >             "name": "query-tpm-types",
> >             "type": "Command",
> >             "returns": [
> >          >      {
> >          >          "type": "passthrough"
> >          >      }
> >             ]
> >         },
> > 
> >> >   { 'command': 'query-tpm-types', 'returns': ['TpmType'] }
> >         {
> >             "name": "query-tpm-types",
> >             "type": "Command",
> >             "returns": [
> >          >      {
> >          >          "type": "TpmType",
> >          >          "data": [
> >          >              {
> >          >                  "type": "passthrough"
> >          >              }
> >          >          ]
> >          >      }
> >             ]
> >         },
> 
> Thanks.  I see this is unique, but it is also not too intuitive.
> 
> So, could you add a "kind" field to DataObject that is an enum
> (list/dict/scalar, or something like that)?  This would make it easier
> to parse (for humans at least, but I guess also for programs).

I thought we can identify the kind by some judgment.
 if the dict has key 'key', it's a dict
 if no 'key', have 'type', it's a list
 if only have 'type', it's a buildin type (or extended type that
   doesn't need to be extended)
 if no 'key', have 'type' & 'data', it's extended list type
 if have 'key', 'type', 'data', it's extended dict type

I will added a 'kind' field to make it clearer.

KIND enum:
  list
  dict
  str

scalar(bool):   Or just simplely check if have 'data' key?
  true/false

Amos

> Paolo