def inventory_hash_check():
'''
Find the node with the oldest inventory timestamp and query it
'''
logging.debug('DEBUG: inventory_hash_check()')
siblings = Sibling.objects.filter(status=NODE_STATUS_UP).order_by('last_inventory_hash')
if siblings:
oldest = siblings[0]
try:
lock = Lock.acquire_lock(u''.join(['inventory_hash', oldest.uuid]), 20)
oldest.last_inventory_hash = datetime.datetime.now()
remote_api = RemoteCall(uuid=oldest.uuid)
response = remote_api.inventory_hash()
if oldest.inventory_hash != response['inventory_hash']:
# Delete this holder from all it's resources to catch
# later the ones it doesn't have anymore
ResourceHolder.objects.filter(node__uuid=oldest.uuid).delete()
for resource_item in remote_api.resource_list():
uuid, timestamp=resource_item['uuid'].split(TIMESTAMP_SEPARATOR)
resource, created = NetworkResourceVersion.objects.get_or_create(
uuid=uuid,
timestamp=timestamp,
defaults={
'metadata': dumps(resource_item.get('metadata')),
'signature_properties': dumps(resource_item.get('signature_properties')),
}
)
resource.resourceholder_set.get_or_create(node=oldest)
oldest.inventory_hash = response['inventory_hash']
oldest.save()
# Delete network resources that have no holder
NetworkResourceVersion.objects.filter(resourceholder=None).delete()
lock.release()
except LockError:
pass
except InventoryHashError:
lock.release()
