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Date: Mon, 21 May 2012 16:26:00 +0200
From: Paolo Bonzini <pbonzini@redhat.com>
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Subject: Re: [Qemu-devel] Proposal for extensions of block job commands in
 QEMU 1.2
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To: Anthony Liguori <anthony@codemonkey.ws>
Cc: Kevin Wolf <kwolf@redhat.com>, Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>, qemu-devel <qemu-devel@nongnu.org>, Luiz Capitulino <lcapitulino@redhat.com>, Federico Simoncelli <fsimonce@redhat.com>, Eric Blake <eblake@redhat.com>

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

Paolo