Re: [Users] Unable to get latest resource status

27 Apr 2012


      On 04/27/2012 04:06 PM, Juan Hernandez wrote:
...
On 04/26/2012 05:49 PM, Alex Jia wrote:
...
I built ovirt-engine-sdk rpm based on git repo 'http://gerrit.ovirt.org/p/ovirt-engine-sdk.git',
then the ovirt-engine-sdk works well for me, I can get resource information from Ovirt/RHEVM(3.0)
on the rhel6.2.
The only question is I can't get latest resource status when I changed VM from 'suspended' to 'up'
status, the api.vms.get(vm_name).status.state is always 'suspended' status, I can get a correct
VM status unless I reconnect Ovirt/RHEVM, it's not convenient for users, I remember there are reload
and wait_for_status method in old python binding API of RHEV(python-rhev), the wait_for_status method
will reload resource then get current resource status, however, I haven't found similar method in
ovirt-engine-sdk.
Are you sure you are calling api.vms.get(vm_name) each time? Or are you
doing something like this:
vm = api.vms.get(vm_name)
while vm.status.state == "suspended":
     sleep(10)
Yeah, I put 'api.vms.get(vm_name)' in a loop body like above codes.
If you are doing that the vm information is retrieved only once, not
each time. If this is the case try something like this:
while api.vms.get(VM_NAME).status.state == "suspended":
     sleep(1)
Can you share that snippet of code so that I can try to reproduce it?
Okay, I will list my snippet of code in here, you may replace 'logging' 
with 'print' then remove
useless '()' if need. thanks.
<snip>
import time, logging
from ovirtsdk.api import API
from ovirtsdk.xml import params

class RHEV(object):
     """
     RHEV class
     """

     def __init__(self, url, username, password):
         try:
             self.api = API(url, username, password)
         except Exception as e:
             logging.error('could not connect: %s\n' % str(e))
         else:
             logging.info('success: RHEV manager could be reached OK\n')

     def vm_start(self, vm_name):
         try:
             vm = self.api.vms.get(vm_name)
             if vm.status.state != 'up':
                 logging.info('Starting VM')
                 vm.start()
                 logging.info('Waiting for VM to reach Up status')
                 while vm.status.state != 'up':
                     time.sleep(1)
             else:
                 logging.debug('VM already up')
         except Exception as e:
             logging.error('Failed to start VM:\n%s' % str(e))

     def vm_suspend(self, vm_name):
         vm = self.api.vms.get(vm_name)
         while vm.status.state != 'suspended':
             try:
                 logging.info('Suspend VM')
                 vm.suspend()
                 logging.info('Waiting for VM to reach suspended status')
                 while vm.status.state != 'suspended':
                     time.sleep(1)

             except Exception as e:
                 if e.reason == 'Bad Request' \
                     and 'asynchronous running tasks' in e.detail:
                     logging.warning('VM has asynchronous running tasks, 
trying again')
                     time.sleep(1)
                 else:
                     logging.error('Failed to suspend VM:\n%s' % str(e))
                     break

     def vm_resume(self, vm_name):
         try:
             vm = self.api.vms.get(vm_name)
             if vm.status.state != 'up':
                 logging.info('Resume VM')
                 vm.start()
                 logging.info('Waiting for VM to resume')
                 while vm.status.state != 'up':
                     time.sleep(1)
             else:
                 logging.debug('VM already up')
         except Exception as e:
             logging.error('Failed to resume VM:\n%s' % str(e))

</snip>