import oca import socket from django.db import models from django.conf import settings from oca.pool import WrongNameError class VirtualMachineTemplate(models.Model): """This class represents an opennebula template.""" opennebula_id = models.IntegerField() base_price = models.FloatField() memory_price = models.FloatField() core_price = models.FloatField() disk_size_price = models.FloatField() class VirtualMachine(models.Model): """This class represents an opennebula virtual machine.""" opennebula_id = models.IntegerField() template = models.ForeignKey(VirtualMachineTemplate) class OpenNebulaManager(): """This class represents an opennebula manager.""" def __init__(self, email=None, password=None, create_user=True): # Get oneadmin client self.oneadmin_client = self._get_opennebula_client( settings.OPENNEBULA_USERNAME, settings.OPENNEBULA_PASSWORD ) if not create_user: return # Get or create oppenebula user using given credentials self.opennebula_user = self._get_or_create_user( email, password ) # If opennebula user was created/obtained, get his client if self.opennebula_user: self.client = self._get_opennebula_client( email, password ) 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') return opennebula_user except ConnectionRefusedError: print('Could not connect to host: {host} via protocol {protocol}'.format( host=settings.OPENNEBULA_DOMAIN, protocol=settings.OPENNEBULA_PROTOCOL) ) def _get_user_pool(self): try: user_pool = oca.UserPool(self.oneadmin_client) user_pool.info() except ConnectionRefusedError: print('Could not connect to host: {host} via protocol {protocol}'.format( host=settings.OPENNEBULA_DOMAIN, protocol=settings.OPENNEBULA_PROTOCOL) ) return user_pool def create_template(self, name, cores, memory, disk_size): """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 (MB) :param disk_size: Amount of disk space for VM (MB) """ template_string_formatter = """ """ 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 ) ) return template_id