On 05/21/2012 09:26 AM, Paolo Bonzini wrote:
Il 21/05/2012 16:19, Anthony Liguori ha scritto:


I'm not against it in principle, just in practice.  Today, checking
whether a command exists is:

commands = qmp.query_commands()

if 'block-stream' in commands:
     # has block-stream

I have a hard time envisioning how schema introspection can be
reasonably implemented in a client.

schema = qmp.query_command_schema('block-stream')

What would schema return?

Did you mean:

if schema['arguments'].has_key('on_error'):

What about adding a parameter to a structure?

BTW, the other problem with adding arguments like this is that it makes a stable C API impossible.

Regards,

Anthony Liguori

if 'on-error' in schema:
     # has on-error

Paolo




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