dynamicweb/opennebula_api/models.py

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import oca
import socket
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import logging
from oca.pool import WrongNameError, WrongIdError
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from oca.exceptions import OpenNebulaException
from django.conf import settings
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from utils.models import CustomUser
from .exceptions import KeyExistsError, UserExistsError, UserCredentialError
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logger = logging.getLogger(__name__)
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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
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def _get_client(self, user):
"""Get a opennebula client object for a CustomUser object
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Args:
user (CustomUser): dynamicweb CustomUser object
Returns:
oca.Client: Opennebula client object
Raise:
ConnectionError: If the connection to the opennebula server can't be
established
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"""
return oca.Client("{0}:{1}".format(
user.email,
user.password),
"{protocol}://{domain}:{port}{endpoint}".format(
protocol=settings.OPENNEBULA_PROTOCOL,
domain=settings.OPENNEBULA_DOMAIN,
port=settings.OPENNEBULA_PORT,
endpoint=settings.OPENNEBULA_ENDPOINT
))
def _get_opennebula_client(self, username, password):
return oca.Client("{0}:{1}".format(
username,
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password),
"{protocol}://{domain}:{port}{endpoint}".format(
protocol=settings.OPENNEBULA_PROTOCOL,
domain=settings.OPENNEBULA_DOMAIN,
port=settings.OPENNEBULA_PORT,
endpoint=settings.OPENNEBULA_ENDPOINT
))
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def _get_user(self, user):
"""Get the corresponding opennebula user for a CustomUser object
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Args:
user (CustomUser): dynamicweb CustomUser object
Returns:
oca.User: Opennebula user object
Raise:
WrongNameError: If no openebula user with this credentials exists
ConnectionError: If the connection to the opennebula server can't be
established
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"""
user_pool = self._get_user_pool()
return user_pool.get_by_name(user.email)
def create_user(self, user: CustomUser):
"""Create a new opennebula user or a corresponding CustomUser object
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Args:
user (CustomUser): dynamicweb CustomUser object
Returns:
int: Return the opennebula user id
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Raises:
ConnectionError: If the connection to the opennebula server can't be
established
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UserExistsError: If a user with this credeintals already exits on the
server
UserCredentialError: If a user with this email exists but the
password is worng
"""
try:
self._get_user(user)
try:
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self._get_client(self, user)
logger.debug('User already exists')
raise UserExistsError()
except OpenNebulaException as err:
logger.error('OpenNebulaException error: {0}'.format(err))
logger.debug('User exists but password is wrong')
raise UserCredentialError()
except WrongNameError:
user_id = self.oneadmin_client.call(oca.User.METHODS['allocate'],
user.email, user.password, 'core')
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logger.debug('Created a user for CustomObject: {user} with user id = {u_id}',
user=user,
u_id=user_id
)
return user_id
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except ConnectionRefusedError:
logger.error('Could not connect to host: {host} via protocol {protocol}'.format(
host=settings.OPENNEBULA_DOMAIN,
protocol=settings.OPENNEBULA_PROTOCOL)
)
raise ConnectionRefusedError
def _get_or_create_user(self, email, password):
try:
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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
)
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return opennebula_user
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except ConnectionRefusedError:
logger.info('Could not connect to host: {host} via protocol {protocol}'.format(
host=settings.OPENNEBULA_DOMAIN,
protocol=settings.OPENNEBULA_PROTOCOL)
)
raise ConnectionRefusedError
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def _get_user_pool(self):
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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
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return user_pool
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def _get_vm_pool(self):
try:
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vm_pool = oca.VirtualMachinePool(self.client)
vm_pool.info()
return vm_pool
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except AttributeError:
logger.info('Could not connect via client, using oneadmin instead')
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try:
vm_pool = oca.VirtualMachinePool(self.oneadmin_client)
vm_pool.info(filter=-2)
return vm_pool
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except:
raise ConnectionRefusedError
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except ConnectionRefusedError:
logger.info('Could not connect to host: {host} via protocol {protocol}'.format(
host=settings.OPENNEBULA_DOMAIN,
protocol=settings.OPENNEBULA_PROTOCOL)
)
raise ConnectionRefusedError
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# 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:
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raise ConnectionRefusedError
def get_vm(self, vm_id):
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vm_id = int(vm_id)
try:
vm_pool = self._get_vm_pool()
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return vm_pool.get_by_id(vm_id)
except WrongIdError:
raise WrongIdError
except:
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raise ConnectionRefusedError
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def create_vm(self, template_id, specs, ssh_key=None, vm_name=None):
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template = self.get_template(template_id)
vm_specs_formatter = """<TEMPLATE>
<MEMORY>{memory}</MEMORY>
<VCPU>{vcpu}</VCPU>
<CPU>{cpu}</CPU>
"""
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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']),
)
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vm_specs += """<DISK>
<TYPE>fs</TYPE>
<SIZE>{size}</SIZE>
<DEV_PREFIX>vd</DEV_PREFIX>
<IMAGE_ID>{image_id}</IMAGE_ID>
</DISK>
""".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']),
)
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vm_specs += """<DISK>
<TYPE>fs</TYPE>
<SIZE>{size}</SIZE>
<DEV_PREFIX>vd</DEV_PREFIX>
<IMAGE>{image}</IMAGE>
<IMAGE_UNAME>{image_uname}</IMAGE_UNAME>
</DISK>
""".format(size=1024 * int(specs['disk_size']),
image=image,
image_uname=image_uname)
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vm_specs += "<CONTEXT>"
if ssh_key:
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vm_specs += "<SSH_PUBLIC_KEY>{ssh}</SSH_PUBLIC_KEY>".format(ssh=ssh_key)
vm_specs += """<NETWORK>YES</NETWORK>
</CONTEXT>
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</TEMPLATE>
"""
vm_id = self.client.call(oca.VmTemplate.METHODS['instantiate'],
template.id,
'',
True,
vm_specs,
False)
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self.oneadmin_client.call(
oca.VirtualMachine.METHODS['action'],
'release',
vm_id
)
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if vm_name is not None:
self.oneadmin_client.call(
'vm.rename',
vm_id,
vm_name
)
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return vm_id
def delete_vm(self, vm_id):
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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))
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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
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except:
raise ConnectionRefusedError
def get_templates(self):
try:
public_templates = [
template
for template in self._get_template_pool()
if template.name.startswith('public-')
]
return public_templates
except ConnectionRefusedError:
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raise ConnectionRefusedError
except:
raise ConnectionRefusedError
def try_get_templates(self):
try:
return self.get_templates()
except:
return []
def get_template(self, template_id):
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template_id = int(template_id)
try:
template_pool = self._get_template_pool()
return template_pool.get_by_id(template_id)
except:
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raise ConnectionRefusedError
def create_template(self, name, cores, memory, disk_size, core_price, memory_price,
disk_size_price, ssh=''):
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"""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
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"""
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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>
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</TEMPLATE>
"""
template_id = oca.VmTemplate.allocate(
self.oneadmin_client,
template_string_formatter.format(
name=name,
vcpu=cores,
cpu=0.1 * cores,
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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
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)
)
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
)
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def add_public_key(self, user, public_key='', merge=False):
"""
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Args:
user (CustomUser): Dynamicweb user
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public_key (string): Public key to add to the user
merge (bool): Optional if True the new public key replaces the old
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Raises:
KeyExistsError: If replace is False and the user already has a
public key
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WrongNameError: If no openebula user with this credentials exists
ConnectionError: If the connection to the opennebula server can't be
established
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Returns:
True if public_key was added
"""
# TODO: Check if we can remove this first try because we basically just
# raise the possible Errors
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try:
open_user = self._get_user(user)
try:
old_key = open_user.template.ssh_public_key
if not merge:
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raise KeyExistsError()
public_key += '\n{key}'.format(key=old_key)
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except AttributeError:
pass
self.oneadmin_client.call('user.update', open_user.id,
'<CONTEXT><SSH_PUBLIC_KEY>{key}</SSH_PUBLIC_KEY></CONTEXT>'
.format(key=public_key))
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return True
except WrongNameError:
raise
except ConnectionError:
raise
def remove_public_key(self, user, public_key=''):
"""
Args:
user (CustomUser): Dynamicweb user
public_key (string): Public key to be removed to the user
Raises:
KeyDoesNotExistsError: If replace is False and the user already has a
public key
WrongNameError: If no openebula user with this credentials exists
ConnectionError: If the connection to the opennebula server can't be
established
Returns:
True if public_key was removed
"""
try:
open_user = self._get_user(user)
try:
old_key = open_user.template.ssh_public_key
if public_key not in old_key:
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return False
# raise KeyDoesNotExistsError()
if '\n{}'.format(public_key) in old_key:
public_key = old_key.replace('\n{}'.format(public_key), '')
else:
public_key = old_key.replace(public_key, '')
except AttributeError:
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return False
# raise KeyDoesNotExistsError()
self.oneadmin_client.call('user.update', open_user.id,
'<CONTEXT><SSH_PUBLIC_KEY>{key}</SSH_PUBLIC_KEY></CONTEXT>'
.format(key=public_key))
return True
except WrongNameError:
raise
except ConnectionError:
raise