Re: [Qemu-devel] RFC: Full introspection support for QMP

[Luiz Capitulino]

On Wed, 22 May 2013 21:40:07 +0800
Amos Kong <address@hidden> wrote:

> Hi all,
> 
> We already have query-command-line-options to query details of command-line
> options. As we discussed in the list, we also need full introspection of QMP
> (command). The qmp-events also need to be dumped, we can define events in
> qai-schema.json. We can also dump QMP errors in future if it's needed.
> 
> Command name: query-qmp-schema
> Return: returns the contents of qapi-schema.json in json format.
> 
> Solution to query json content from C code:
>   qapi-schema.json is processed by qapi python scripts to generate C
>   files, I found the content is good enough for Libvirt to know the
>   QMP command schema. We can change qapi scripts to generate a talbe/list
>   to record the raw string, then we can return the raw string in
>   qmp_query_qmp_schema().
> 
> By default, return the complete schema in one go.
> 
> And support to query of unknown type in new command.
>   -> { "execute": "query-qmp-schema" "arguments": { "command": "query-status" 
> }}
>   <- { "return" : "data": { "command': "query-status", "returns": 
> "StatusInfo" }}
>   -> { "execute": "query-qmp-schema" "arguments": { "type": "StatusInfo" }}
>   <- { "return" : "data": { "type": "StatusInfo", "data": {"running": "bool",
>                             "singlestep": "bool", "status": "RunState"} }

Looks good, but as Kevin said an example of the schema output would be good.
Feel free to post patches along :)

>   -> { "execute": "query-qmp-schema" "arguments": { "event": 
> "RX-FILTER-CHANGE" }}

You'll need to add the events to the schema some way. I'm not sure I'd mix
the projects in the same series, maybe you could add event support to the
schema after query-qmp-schema gets merged.

>   
> 
> Welcome your comments, thanks!
> 
> 
> Target: 1.6
> Related RHBZ: https://bugzilla.redhat.com/show_bug.cgi?id=557939
>