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from lxml import etree
import glob
import common
from execution_environment import ExecutionEnvironment
exec_cmd = common.exec_cmd
err = common.err
log = common.log
check_dir_exists = common.check_dir_exists
check_file_exists = common.check_file_exists
check_if_root = common.check_if_root
NET_DIR = 'libvirt/networks'
class LibvirtEnvironment(ExecutionEnvironment):
def __init__(self, storage_dir, dha_file, dea, root_dir):
super(LibvirtEnvironment, self).__init__(
storage_dir, dha_file, root_dir)
self.dea = dea
self.network_dir = '%s/%s' % (self.root_dir, NET_DIR)
self.node_ids = self.dha.get_all_node_ids()
self.net_names = self.collect_net_names()
def create_storage(self, node_id, disk_path, disk_sizes):
if node_id == self.fuel_node_id:
disk_size = disk_sizes['fuel']
else:
roles = self.dea.get_node_role(node_id)
role = 'controller' if 'controller' in roles else 'compute'
disk_size = disk_sizes[role]
exec_cmd('fallocate -l %s %s' % (disk_size, disk_path))
def create_vms(self):
temp_dir = exec_cmd('mktemp -d')
disk_sizes = self.dha.get_disks()
for node_id in self.node_ids:
vm_name = self.dha.get_node_property(node_id, 'libvirtName')
vm_template = '%s/%s' % (self.root_dir,
self.dha.get_node_property(
node_id, 'libvirtTemplate'))
check_file_exists(vm_template)
disk_path = '%s/%s.raw' % (self.storage_dir, vm_name)
self.create_storage(node_id, disk_path, disk_sizes)
temp_vm_file = '%s/%s' % (temp_dir, vm_name)
exec_cmd('cp %s %s' % (vm_template, temp_vm_file))
self.define_vm(vm_name, temp_vm_file, disk_path)
exec_cmd('rm -fr %s' % temp_dir)
def create_networks(self):
for net_file in glob.glob('%s/*' % self.network_dir):
exec_cmd('virsh net-define %s' % net_file)
for net in self.net_names:
log('Creating network %s' % net)
exec_cmd('virsh net-autostart %s' % net)
exec_cmd('virsh net-start %s' % net)
def delete_networks(self):
for net in self.net_names:
log('Deleting network %s' % net)
exec_cmd('virsh net-destroy %s' % net, False)
exec_cmd('virsh net-undefine %s' % net, False)
def get_net_name(self, net_file):
with open(net_file) as f:
net_xml = etree.parse(f)
name_list = net_xml.xpath('/network/name')
for name in name_list:
net_name = name.text
return net_name
def collect_net_names(self):
net_list = []
for net_file in glob.glob('%s/*' % self.network_dir):
name = self.get_net_name(net_file)
net_list.append(name)
return net_list
def delete_vms(self):
for node_id in self.node_ids:
self.delete_vm(node_id)
def setup_environment(self):
check_if_root()
check_dir_exists(self.network_dir)
self.cleanup_environment()
self.create_vms()
self.create_networks()
def cleanup_environment(self):
self.delete_vms()
self.delete_networks()
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