[Libvir] Ruby bindings for libvirt
Daniel Veillard
veillard at redhat.com
Thu Aug 30 13:01:56 UTC 2007
On Thu, Aug 30, 2007 at 05:32:19PM +0800, Meng Kuan wrote:
> Hi,
>
> I am exploring the possibility of creating ruby bindings for libvirt.
> The only attempt I found after some searching is this:
>
> http://www.cs.ucsb.edu/~ckrintz/racelab/jisha/
>
> Following the SWIG method as described in the above URL, I have
> gotten to the following point:
>
> [root at dell1 libvirt_ruby]# irb
> irb(main):001:0> require 'libvirt_ruby'
> => true
> irb(main):002:0> conn = Libvirt_ruby.virConnectOpenReadOnly("")
> => #<SWIG::TYPE_p__virConnect:0x2aaaaabc46c8>
> irb(main):003:0> dom = Libvirt_ruby.virDomainLookupByID(conn, 0)
> => #<SWIG::TYPE_p__virDomain:0x2aaaaabb5df8>
> irb(main):004:0> ret = Libvirt_ruby.virDomainGetInfo(dom, info)
> NameError: undefined local variable or method `info' for main:Object
> from (irb):4
> irb(main):005:0>
>
> I am not sure how to create and pass in a ptr to a virDomainInfo
> struct object into the virDomainGetInfo call within ruby.
Honnestly, I don't know ruby so no idea.
> Note that I was trying to following the info1.c example on the
> libvirt website:
>
> http://libvirt.org/examples/info1.c
>
> As you can tell, this is the first time I am trying to create any
> sort of language bindings for a C library.
>
> Some questions:
>
> 1. Is there a better way of creating ruby bindings for libvirt
> besides SWIG? If so, any pointers on what should be done?
There is a formal XML definition of the libvirt API
http://libvirt.org/libvirt-api.xml
The waythe python bindings are built is that a python script parses
this XML and then generate the C and python modules needed for the
bindings. I'm not sure this really helps you but at least this mean
you don't have parse the C header files if you want to automate the
process.
> 2. Alternatively I can try to make my ruby code use libvirt-python
> bindings as a python library. Has anyone done so? Any problems with
> this approach?
No idea. But I would be a bit worried about piling up layers like
that, might work for you though..
Daniel
--
Red Hat Virtualization group http://redhat.com/virtualization/
Daniel Veillard | virtualization library http://libvirt.org/
veillard at redhat.com | libxml GNOME XML XSLT toolkit http://xmlsoft.org/
http://veillard.com/ | Rpmfind RPM search engine http://rpmfind.net/
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