[libvirt] [Qemu-devel] Re: Supporting hypervisor specific APIs in libvirt

Jamie Lokier jamie at shareable.org
Fri Mar 26 02:11:15 UTC 2010

Anthony Liguori wrote:
> On 03/25/2010 09:09 AM, Luiz Capitulino wrote:
> >
> >>We can provide a generic QMP dispatch interface that high level
> >>languages can use.  Then they can do fancy dispatch, treat QErrors as
> >>exceptions, etc.
> >>     
> >  They can do that by accessing QMP directly. Why would a Python developer
> >get in the mess of writing a Python binding for libqemu if they call do
> >the exactly same thing by using its native json module?
> >
> >  Man, opening a QMP connection from Python and sending commands can be
> >done with a few lines.
> >   
> Problem is, without a libqemu, libvirt cannot return a QMPContext that 
> can be used by python bindings.   This is the problem that all high 
> level languages have with respect to RPC transports.
> You need libqemu to deal with establishing the transport.  That code 
> needs to be common and shared across languages.

We can't libvirt talk QMG with Python over a pipe or local socket?

So that the Python can talk to native qemu and via libvirt with the
same code.

That would be much easier from Python person than writing a wrapper
around the C library.  Multiplied by each high-level language...

  -- Jamie

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