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Re: [libvirt] Help needed: simple python api to obtain events



On Tue, Oct 06, 2009 at 07:04:29PM +0200, Dan Kenigsberg wrote:
> Would someone help me have a shrink-wrapped solution for obtaining libvirt
> events in python?
> 
> I'm looking for a python module with no API calls (or maybe just a few).
> 
> I'd like to register a callback functions with
> virConnect.domainEventRegister(), and want them to be called in the
> context of a specialized (automatically-created?) thread. I don't mind
> if the module has two API calls instead: register() and
> startPollThread().
> 
> I learned that it takes me far too long to do it on my own, and that just
> modifying events-python.py (attached) reaches miserable outcomes
> ("libvir: Domain error : invalid domain pointer in virDomainFree", and
> deadlocked python:
> #0  0x00000037fe40d174 in __lll_lock_wait () from /lib64/libpthread.so.0
> #1  0x00000037fe408aca in _L_lock_1034 () from /lib64/libpthread.so.0
> #2  0x00000037fe40898c in pthread_mutex_lock () from /lib64/libpthread.so.0
> #3  0x0000003cce04db84 in remoteDomainEventFired ()
> #4  0x00002b4cc96e1612 in libvirt_virEventInvokeHandleCallback ()
> )
> 
> Help most welcome,

After discussions on IRC, it turns out that this is being seen with the
libvirt 0.6.3 release, which had known-broken events code in the python
bindings. It did not do correct locking, or reference counting. The
current libvirt python works with Dan's demo program.


Daniel
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