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