import oca
import socket
import logging
from django.conf import settings
from django.utils.functional import cached_property
from oca.pool import WrongNameError
from oca.exceptions import OpenNebulaException
logger = logging.getLogger(__name__)
class OpenNebulaManager():
"""This class represents an opennebula manager."""
def __init__(self, email=None, password=None):
# Get oneadmin client
self.oneadmin_client = self._get_opennebula_client(
settings.OPENNEBULA_USERNAME,
settings.OPENNEBULA_PASSWORD
)
# Get or create oppenebula user using given credentials
try:
self.opennebula_user = self._get_or_create_user(
email,
password
)
# If opennebula user was created/obtained, get his client
self.client = self._get_opennebula_client(
email,
password
)
except:
pass
def _get_opennebula_client(self, username, password):
return oca.Client("{0}:{1}".format(
username,
password),
"{protocol}://{domain}:{port}{endpoint}".format(
protocol=settings.OPENNEBULA_PROTOCOL,
domain=settings.OPENNEBULA_DOMAIN,
port=settings.OPENNEBULA_PORT,
endpoint=settings.OPENNEBULA_ENDPOINT
))
def _get_or_create_user(self, email, password):
try:
user_pool = self._get_user_pool()
opennebula_user = user_pool.get_by_name(email)
return opennebula_user
except WrongNameError as wrong_name_err:
opennebula_user = self.oneadmin_client.call(oca.User.METHODS['allocate'], email,
password, 'core')
logger.debug(
"User {0} does not exist. Created the user. User id = {1}",
email,
opennebula_user
)
return opennebula_user
except ConnectionRefusedError:
logger.info('Could not connect to host: {host} via protocol {protocol}'.format(
host=settings.OPENNEBULA_DOMAIN,
protocol=settings.OPENNEBULA_PROTOCOL)
)
raise ConnectionRefusedError
def _get_user_pool(self):
try:
user_pool = oca.UserPool(self.oneadmin_client)
user_pool.info()
except ConnectionRefusedError:
logger.info('Could not connect to host: {host} via protocol {protocol}'.format(
host=settings.OPENNEBULA_DOMAIN,
protocol=settings.OPENNEBULA_PROTOCOL)
)
raise ConnectionRefusedError
return user_pool
def _get_vm_pool(self):
try:
vm_pool = oca.VirtualMachinePool(self.client)
vm_pool.info()
return vm_pool
except AttributeError:
logger.info('Could not connect via client, using oneadmin instead')
try:
vm_pool = oca.VirtualMachinePool(self.oneadmin_client)
vm_pool.info(filter=-2)
return vm_pool
except:
raise ConnectionRefusedError
except ConnectionRefusedError:
logger.info('Could not connect to host: {host} via protocol {protocol}'.format(
host=settings.OPENNEBULA_DOMAIN,
protocol=settings.OPENNEBULA_PROTOCOL)
)
raise ConnectionRefusedError
# For now we'll just handle all other errors as connection errors
except:
raise ConnectionRefusedError
def get_vms(self):
try:
return self._get_vm_pool()
except ConnectionRefusedError:
raise ConnectionRefusedError
def get_vm(self, vm_id):
vm_id = int(vm_id)
try:
vm_pool = self._get_vm_pool()
return vm_pool.get_by_id(vm_id)
except:
raise ConnectionRefusedError
def create_template(self, name, cores, memory, disk_size, core_price, memory_price,
disk_size_price, ssh='' ):
"""Create and add a new template to opennebula.
:param name: A string representation describing the template.
Used as label in view.
:param cores: Amount of virtual cpu cores for the VM.
:param memory: Amount of RAM for the VM (GB)
:param disk_size: Amount of disk space for VM (GB)
:param core_price: Price of virtual cpu for the VM per core.
:param memory_price: Price of RAM for the VM per GB
:param disk_size_price: Price of disk space for VM per GB
:param ssh: User public ssh key
"""
template_id = oca.VmTemplate.allocate(
self.oneadmin_client,
template_string_formatter.format(
name=name,
vcpu=cores,
cpu=0.1*cores,
size=1024 * disk_size,
memory=1024 * memory,
# * 10 because we set cpu to *0.1
cpu_cost=10*core_price,
memory_cost=memory_price,
disk_cost=disk_size_price,
ssh=ssh
)
)
def create_vm(self, template_id, specs, ssh_key=None):
template = self.get_template(template_id)
vm_specs_formatter = """<TEMPLATE>
<MEMORY>{memory}</MEMORY>
<VCPU>{vcpu}</VCPU>
<CPU>{cpu}</CPU>
<CONTEXT>
<SSH_PUBLIC_KEY>{ssh}</SSH_PUBLIC_KEY>
</CONTEXT>
"""
try:
disk = template.template.disks[0]
image_id = disk.image_id
vm_specs = vm_specs_formatter.format(
vcpu=int(specs['cpu']),
cpu=0.1* int(specs['cpu']),
memory=1024 * int(specs['memory']),
ssh=ssh_key
)
vm_specs += """<DISK>
<TYPE>fs</TYPE>
<SIZE>{size}</SIZE>
<DEV_PREFIX>vd</DEV_PREFIX>
<IMAGE_ID>{image_id}</IMAGE_ID>
</DISK>
</TEMPLATE>
""".format(size=1024 * int(specs['disk_size']),
image_id=image_id)
except:
disk = template.template.disks[0]
image = disk.image
image_uname = disk.image_uname
vm_specs = vm_specs_formatter.format(
vcpu=int(specs['cpu']),
cpu=0.1* int(specs['cpu']),
memory=1024 * int(specs['memory']),
ssh=ssh_key
)
vm_specs += """<DISK>
<TYPE>fs</TYPE>
<SIZE>{size}</SIZE>
<DEV_PREFIX>vd</DEV_PREFIX>
<IMAGE>{image}</IMAGE>
<IMAGE_UNAME>{image_uname}</IMAGE_UNAME>
</DISK>
</TEMPLATE>
""".format(size=1024 * int(specs['disk_size']),
image=image,
image_uname=image_uname)
vm_id = template.instantiate(name ='',
pending=False,
extra_template=vm_specs, )
try:
self.oneadmin_client.call(
oca.VirtualMachine.METHODS['chown'],
vm_id,
self.opennebula_user.id,
self.opennebula_user.group_ids[0]
)
except AttributeError:
logger.info('Could not change owner for vm with id: {}.'.format(vm_id))
return vm_id
def delete_vm(self, vm_id):
TERMINATE_ACTION = 'terminate'
vm_terminated = False
try:
self.oneadmin_client.call(
oca.VirtualMachine.METHODS['action'],
TERMINATE_ACTION,
int(vm_id),
)
vm_terminated = True
except socket.timeout as socket_err:
logger.info("Socket timeout error: {0}".format(socket_err))
except OpenNebulaException as opennebula_err:
logger.info("OpenNebulaException error: {0}".format(opennebula_err))
except OSError as os_err:
logger.info("OSError : {0}".format(os_err))
except ValueError as value_err:
logger.info("ValueError : {0}".format(value_err))
return vm_terminated
def _get_template_pool(self):
try:
template_pool = oca.VmTemplatePool(self.oneadmin_client)
template_pool.info()
return template_pool
except ConnectionRefusedError:
logger.info('Could not connect to host: {host} via protocol {protocol}'.format(
host=settings.OPENNEBULA_DOMAIN,
protocol=settings.OPENNEBULA_PROTOCOL)
)
raise ConnectionRefusedError
except:
raise ConnectionRefusedError
def get_templates(self):
try:
public_templates = [
template
for template in self._get_template_pool()
if 'public-' in template.name
]
return public_templates
except ConnectionRefusedError:
raise ConnectionRefusedError
except:
raise ConnectionRefusedError
def try_get_templates(self):
try:
return self.get_templates()
except:
return []
def get_template(self, template_id):
template_id = int(template_id)
try:
template_pool = self._get_template_pool()
return template_pool.get_by_id(template_id)
except:
raise ConnectionRefusedError
def create_template(self, name, cores, memory, disk_size, core_price, memory_price,
disk_size_price, ssh='' ):
"""Create and add a new template to opennebula.
:param name: A string representation describing the template.
Used as label in view.
:param cores: Amount of virtual cpu cores for the VM.
:param memory: Amount of RAM for the VM (GB)
:param disk_size: Amount of disk space for VM (GB)
:param core_price: Price of virtual cpu for the VM per core.
:param memory_price: Price of RAM for the VM per GB
:param disk_size_price: Price of disk space for VM per GB
:param ssh: User public ssh key
"""
template_string_formatter = """<TEMPLATE>
<NAME>{name}</NAME>
<MEMORY>{memory}</MEMORY>
<VCPU>{vcpu}</VCPU>
<CPU>{cpu}</CPU>
<DISK>
<TYPE>fs</TYPE>
<SIZE>{size}</SIZE>
<DEV_PREFIX>vd</DEV_PREFIX>
</DISK>
<CPU_COST>{cpu_cost}</CPU_COST>
<MEMORY_COST>{memory_cost}</MEMORY_COST>
<DISK_COST>{disk_cost}</DISK_COST>
<SSH_PUBLIC_KEY>{ssh}</SSH_PUBLIC_KEY>
</TEMPLATE>
"""
template_id = oca.VmTemplate.allocate(
self.oneadmin_client,
template_string_formatter.format(
name=name,
vcpu=cores,
cpu=0.1*cores,
size=1024 * disk_size,
memory=1024 * memory,
# * 10 because we set cpu to *0.1
cpu_cost=10*core_price,
memory_cost=memory_price,
disk_cost=disk_size_price,
ssh=ssh
)
)
return template_id
def delete_template(self, template_id):
self.oneadmin_client.call(oca.VmTemplate.METHODS['delete'], template_id, False)
def change_user_password(self, new_password):
self.oneadmin_client.call(
oca.User.METHODS['passwd'],
self.opennebula_user.id,
new_password
)