dynamicweb/hosting/opennebula_functions.py
2017-05-08 11:36:46 +05:30

287 lines
14 KiB
Python

import logging
import random
import socket
import string
import oca
from django.conf import settings
from django.conf.urls import url
from django.contrib import admin
from django.contrib import messages
from django.shortcuts import redirect
from django.template.response import TemplateResponse
from django.utils.translation import ugettext_lazy as _
from oca.exceptions import OpenNebulaException
from oca.pool import WrongNameError
from django import forms
# Get an instance of a logger
logger = logging.getLogger(__name__)
class HostingManageVMAdmin(admin.ModelAdmin):
client = None
oneadmin_client = None
def get_urls(self):
urls = super().get_urls()
my_urls = [
url(r'^$', self.admin_site.admin_view(self.show_vms, cacheable=True), name='showvms'),
url(r'^create_vm/$', self.admin_site.admin_view(self.create_vm, cacheable=True), name='createvm'),
url(r'^delete_vm/(?P<vmid>\d+)/$', self.admin_site.admin_view(self.delete_vm, cacheable=True),
name='deletevm'),
url(r'^stop_vm/(?P<vmid>\d+)/$', self.admin_site.admin_view(self.stop_vm, cacheable=True), name='stopvm'),
url(r'^start_vm/(?P<vmid>\d+)/$', self.admin_site.admin_view(self.start_vm, cacheable=True),
name='startvm'),
]
return my_urls + urls
# Function to initialize opennebula client based on the logged in
# user
def init_opennebula_client(self, request):
if self.oneadmin_client is None:
self.oneadmin_client = oca.Client("{0}:{1}".format(settings.OPENNEBULA_USERNAME,
settings.OPENNEBULA_PASSWORD),
"{protocol}://{domain}:{port}{endpoint}".format(
protocol=settings.OPENNEBULA_PROTOCOL,
domain=settings.OPENNEBULA_DOMAIN,
port=settings.OPENNEBULA_PORT,
endpoint=settings.OPENNEBULA_ENDPOINT
))
logger.debug("{0}:{1}".format(settings.OPENNEBULA_USERNAME,
settings.OPENNEBULA_PASSWORD))
logger.debug("{protocol}://{domain}:{port}{endpoint}".format(
protocol=settings.OPENNEBULA_PROTOCOL,
domain=settings.OPENNEBULA_DOMAIN,
port=settings.OPENNEBULA_PORT,
endpoint=settings.OPENNEBULA_ENDPOINT
))
self.create_opennebula_user(request)
if self.client is None:
opennebula_user = request.user.email
# TODO: get the password stored in django
opennebula_user_password = get_random_password()
self.client = oca.Client("{0}:{1}".format(opennebula_user, opennebula_user_password),
"{protocol}://{domain}:{port}{endpoint}".format(
protocol=settings.OPENNEBULA_PROTOCOL,
domain=settings.OPENNEBULA_DOMAIN,
port=settings.OPENNEBULA_PORT,
endpoint=settings.OPENNEBULA_ENDPOINT
))
# Function that shows the VMs of the current user
def show_vms(self, request):
vm_pool = None
try:
self.init_opennebula_client(request)
vm_pool = oca.VirtualMachinePool(self.client)
vm_pool.info()
except socket.timeout:
messages.add_message(request, messages.ERROR, _("Socket timeout error."))
except OpenNebulaException as opennebula_err:
messages.add_message(request, messages.ERROR, _("OpenNebulaException occurred. {0}".format(opennebula_err)))
except OSError as err:
messages.add_message(request, messages.ERROR, "OS error: {0}".format(err))
context = dict(
# Include common variables for rendering the admin template.
self.admin_site.each_context(request),
vms=vm_pool,
form=HostingManageVMForm
)
return TemplateResponse(request, "hosting/managevms.html", context)
# Creating VM by using method allocate(client, template)
def create_vm(self, request):
# check if the request contains the template parameter, if it is
# not set warn the user of setting this.
vm_template = request.POST.get('vm_template')
if vm_template == 'select':
messages.add_message(request, messages.ERROR, "Please select a vm template")
else:
try:
# We do have the vm_template param set. Get and parse it
# and check it to be in the desired range.
# We have 8 possible VM templates for the moment which are 1x, 2x, 4x ...
# the basic template of 10GB disk, 1GB ram, 1 vcpu, 0.1 cpu
vm_template_int = int(vm_template)
if 1 <= vm_template_int <= 8:
vm_string_formatter = """<VM>
<CONTEXT>
<SSH_PUBLIC_KEY>
{ssh_key}
</SSH_PUBLIC_KEY>
</CONTEXT>
<MEMORY>{memory}</MEMORY>
<VCPU>{vcpu}</VCPU>
<CPU>{cpu}</CPU>
<DISK>
<TYPE>{disk_type}</TYPE>
<SIZE>{size}</SIZE>
<DEV_PREFIX>{dev_prefix}</DEV_PREFIX>
</DISK>
</VM>
"""
vm_id = oca.VirtualMachine.allocate(self.client,
vm_string_formatter.format(
ssh_key='', # public key of the user
memory=1024 * vm_template_int, # memory in MB
vcpu=vm_template_int, # vpcu
cpu=0.1 * vm_template_int, # cpu
disk_type='fs',
size=10000 * vm_template_int,
dev_prefix='vd')) # We need KVM virtual disk
message = _("Created with id = " + str(vm_id))
messages.add_message(request, messages.SUCCESS, message)
else:
messages.add_message(request, messages.ERROR,
_("Please select an appropriate value for vm template."))
except socket.timeout as socket_err:
messages.add_message(request, messages.ERROR, _("Socket timeout error."))
logger.error("Socket timeout error: {0}".format(socket_err))
except OpenNebulaException as opennebula_err:
messages.add_message(request, messages.ERROR,
_("OpenNebulaException occurred. {0}".format(opennebula_err)))
logger.error("OpenNebulaException error: {0}".format(opennebula_err))
except OSError as os_err:
messages.add_message(request, messages.ERROR, _("OS error: {0}".format(os_err)))
logger.error("OSError : {0}".format(os_err))
except ValueError as value_err:
messages.add_message(request, messages.ERROR,
_("Please select an appropriate value for vm template."))
logger.error("ValueError : {0}".format(value_err))
return redirect('admin:showvms')
# Delete VM from the pool and DB by using method finalize()
def delete_vm(self, request, vmid):
vm_id = int(vmid)
# get the desired vm from the pool
logger.debug("Deleting vm with id {0}".format(vm_id))
vm = self.get_vm_by_id(vm_id)
if vm is None:
messages.add_message(request, messages.ERROR, _("Did not find a vm with id = {0}".format(vm_id)))
else:
logger.debug("Deleting vm_id = " + str(vm_id) + " state = " + vm.str_state)
if vm.str_state == 'PENDING' or vm.str_state == 'POWEROFF' or vm.str_state == 'ACTIVE':
vm.delete()
messages.add_message(request, messages.SUCCESS,
_("Deleted from {0} state vm with id = {1}".format(vm.str_state, str(vm_id))))
else:
vm.finalize()
messages.add_message(request, messages.SUCCESS,
_("Deleted (using finalize()) from {0} state vm with id = {1}".format(vm.str_state,
str(vm_id))))
return redirect('admin:showvms')
def stop_vm(self, request, vmid):
vm_id = int(vmid)
vm = self.get_vm_by_id(vm_id)
if vm is None:
messages.add_message(request, messages.ERROR, _("Did not find a vm with id = {0}", vm_id))
else:
vm.stop()
messages.add_message(request, messages.SUCCESS, _("Stopped the vm with id = {0}", vm_id))
return redirect('admin:showvms')
def start_vm(self, request, vmid):
vm_id = int(vmid)
vm = self.get_vm_by_id(vm_id)
if vm is None:
messages.add_message(request, messages.ERROR, _("Did not find a vm with id = {0}", vm_id))
else:
vm.resume()
messages.add_message(request, messages.SUCCESS, _("Started the vm with id = {0}", vm_id))
return redirect('admin:showvms')
# Retrives virtual machine pool information
def get_vm_pool(self):
vm_pool = oca.VirtualMachinePool(self.client)
vm_pool.info()
return vm_pool
def get_vm_by_id(self, vmid):
vm_pool = self.get_vm_pool()
return vm_pool.get_by_id(vmid)
def create_opennebula_user(self, request):
# Notes:
# 1. python-oca library's oca.User.allocate(client, user, pass)
# method does not work with python-oca version oca-4.15.0a1-py3.5
# This is because the call is missing a fourth parameter
# auth_driver.
# To overcome this issue, we make a direct call to xml-rpc method
# 'user.allocate' passing this fourth parameter.
#
# 2. We have a dummy authentication driver in opennebula and we
# use this so as to avoid opennebula authentication. However, we
# need to supply a dummy password. Without this, we can not
# create an OpenNebula user. We use dummy string 'a' as password
# for all users.
#
# 3. We user the user's email as the user name.
# 4. If the user's email is not registered with OpenNebula,
# WrongNameError is raised. We create an OpenNebula user in
# such case.
try:
user_pool = oca.UserPool(self.oneadmin_client)
user_pool.info()
opennebula_user = user_pool.get_by_name(request.user.email)
logger.debug("User {0} exists. User id = {1}".format(request.user.email, opennebula_user.id))
except WrongNameError as wrong_name_err:
# TODO: Store this password so that we can use it later to
# connect to opennebula
password = get_random_password()
oca.User.allocate(self.oneadmin_client, request.user.email, password)
logger.debug("User {0} does not exist. Created the user. User id = {1}", request.user.email, user_id)
except OpenNebulaException as err:
messages.add_message(request, messages.ERROR,
"Error : {0}".format(err))
logger.error("Error : {0}".format(err))
def set_field_html_name(cls, new_name):
"""
This creates wrapper around the normal widget rendering,
allowing for a custom field name (new_name).
"""
old_render = cls.widget.render
def _widget_render_wrapper(name, value, attrs=None):
return old_render(new_name, value, attrs)
cls.widget.render = _widget_render_wrapper
class HostingManageVMForm(forms.Form):
vm_templates = []
VM_CHOICES = (('1', 'disk = 10GB, vcpu=1, ram=1GB'),
('2', 'disk = 20GB, vcpu=2, ram=2GB'),
('3', 'disk = 40GB, vcpu=4, ram=4GB'),
('4', 'disk = 80GB, vcpu=8, ram=8GB'),
('5', 'disk = 160GB, vcpu=16, ram=16GB'),
('6', 'disk = 320GB, vcpu=32, ram=32GB'),
('7', 'disk = 640GB, vcpu=64, ram=64GB'),
('8', 'disk = 1280GB, vcpu=128, ram=128GB'))
#for i in range(0,8):
# factor = pow(2, i)
# vm_templates.append(VMTemplate(i, VM_CHOICES[i], 10000 * factor, factor , 0.1 * factor, 1024 * factor))
field = forms.ChoiceField(label="Choose a VM Template ", choices=VM_CHOICES, widget=forms.Select(attrs={"id": "vm_template"}))
set_field_html_name(field, 'vm_template')
class VMTemplate:
"""A simple representation of a VM template.
:param template_id: The id of the template
:param label: A string representation describing the template. Used as the label in view
:param disk: VM disk space in MB
:param vcpu: Virtual cpu for the VM
:param cpu: CPU for the VM
:param ram: The RAM for the VM
"""
def __init__(self, template_id, label, disk, vcpu, cpu, ram):
self.template_id = template_id
self.label = label
self.disk = disk
self.vcpu = vcpu
self.cpu = cpu
# Returns random password that is needed by OpenNebula
def get_random_password():
return ''.join(random.SystemRandom().choice(string.ascii_uppercase + string.digits) for _ in range(20))