[libvirt] libvirt-qpid

[Ian Main]

Howdy folks!

So I've been working on a qpid interface to libvirt.  Here's the description
I've come up with:

libvirt-qpid provides an interface with libvirt using QMF (qpid modeling
framework) which utilizes the AMQP protocol.  The Advanced Message Queuing
Protocol (AMQP) is an open standard application layer protocol providing
reliable transport of messages.

QMF provides a modeling framework layer on top of qpid.  This interface 
allows you to manage hosts, domains, pools etc. as a set of objects with 
properties and methods.

The source code repo:

http://git.et.redhat.com/?p=libvirt-qpid.git;a=summary

So I'd like to hear any feedback you guys might have.  This file in particular
describes the API that is used to interact with libvirt.

http://git.et.redhat.com/?p=libvirt-qpid.git;a=blob_plain;f=src/libvirt-schema.xml

My TODO list looks like this:

- Not sure on camel case or underscores.  Original libvirt API uses
camel case, I went with underscores as I was originally basing it off
the ruby bindings.
- Need rc scripts, daemonization, better reconnect/error handling for
both qpid and libvirt.  I think it should attempt to reconnect until
successful whenever it gets disconnected.  We may need an extra status
property for this state as well.
- Return libvirt error codes? (it's just text msgs right now with error
  status bit).
- Make it less chatty, but log stuff


If you wish to try it out, I've made rpms for fedora 9 x86_64 and i386.
They are in the ovirt repo, which you can add to yum using:

rpm -ivh http://ovirt.org/repos/ovirt/9/ovirt-release-LATEST.fc9.noarch.rpm

Once you have that set up, 'yum install libvirt-qpid python-qpid', and then
run (each in their own terminals):

qpidd --auth no
libvirt-qpid (as root to auth with libvirt)
qpid-tool

qpid-tool provides an interface to qpid and allows you to view/manipulate the
qpid models/objects.  Here is an example of how it looks using qpid-tool:

$ qpid-tool
Management Tool for QPID
qpid: list
Management Object Types:
    ObjectType                 Active  Deleted
    ============================================
    com.redhat.libvirt:domain  2       0
    com.redhat.libvirt:node    1       0
qpid: list node
Objects of type com.redhat.libvirt:node
    ID   Created   Destroyed  Index
    =================================
    101  00:02:00  -
qpid: show 101
Object of type com.redhat.libvirt:node: (last sample time: 17:47:54)
    Type      Element             101
    ==============================================
    property  hostname            vpro.mains.net
    property  uri                 qemu:///system
    property  libvirt_version     0.4.5
    property  api_version         0.4.5
    property  hypervisor_version  0.9.1
    property  hypervisor_type     QEMU
qpid: list domain
Objects of type com.redhat.libvirt:domain
    ID   Created   Destroyed  Index
    =================================
    102  00:02:05  -          101
    103  00:02:05  -          101
qpid: show 102
Object of type com.redhat.libvirt:domain: (last sample time: 17:48:09)
    Type       Element         102
    =================================================================
    property   uuid            662958f8-12c5-baad-2252-4d2126e0971f
    property   name            ovirt-appliance
    property   node            101
    property   state           shutoff
    property   num_vcpus       1
    property   active          false
    statistic  maximum_memory  786432
    statistic  memory          786432
    statistic  cpu_time        0
qpid: call 102 create
Call Result: create  0 (OK) {}
qpid: show 102
Object of type com.redhat.libvirt:domain: (last sample time: 17:48:24)
    Type       Element         102
    =================================================================
    property   uuid            662958f8-12c5-baad-2252-4d2126e0971f
    property   name            ovirt-appliance
    property   node            101
    property   state           running
    property   num_vcpus       1
    property   active          true
    statistic  maximum_memory  786432
    statistic  memory          786432
    statistic  cpu_time        0
qpid: