dynamicweb/opennebula_api/views.py

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from rest_framework import generics
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from rest_framework import permissions
from .serializers import VirtualMachineSerializer
from .models import OpenNebulaManager
from rest_framework.exceptions import APIException
class ServiceUnavailable(APIException):
status_code = 503
default_detail = 'Service temporarily unavailable, try again later.'
default_code = 'service_unavailable'
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class VmCreateView(generics.ListCreateAPIView):
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"""This class handles the GET and POST requests."""
serializer_class = VirtualMachineSerializer
permission_classes = (permissions.IsAuthenticated, )
def get_queryset(self):
owner = self.request.user
manager = OpenNebulaManager(email=owner.email,
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password=owner.password)
# We may have ConnectionRefusedError if we don't have a
# connection to OpenNebula. For now, we raise ServiceUnavailable
try:
vms = manager.get_vms()
except ConnectionRefusedError:
raise ServiceUnavailable
return vms
def perform_create(self, serializer):
"""Save the post data when creating a new template."""
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serializer.save(owner=self.request.user)
class VmDetailsView(generics.RetrieveUpdateDestroyAPIView):
"""This class handles the http GET, PUT and DELETE requests."""
permission_classes = (permissions.IsAuthenticated, )
serializer_class = VirtualMachineSerializer
def get_queryset(self):
owner = self.request.user
manager = OpenNebulaManager(email=owner.email,
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password=owner.password)
# We may have ConnectionRefusedError if we don't have a
# connection to OpenNebula. For now, we raise ServiceUnavailable
try:
vms = manager.get_vms()
except ConnectionRefusedError:
raise ServiceUnavailable
return vms
def get_object(self):
owner = self.request.user
manager = OpenNebulaManager(email=owner.email,
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password=owner.password)
# We may have ConnectionRefusedError if we don't have a
# connection to OpenNebula. For now, we raise ServiceUnavailable
try:
vm = manager.get_vm(self.kwargs.get('pk'))
except ConnectionRefusedError:
raise ServiceUnavailable
return vm
def perform_destroy(self, instance):
owner = self.request.user
manager = OpenNebulaManager(email=owner.email,
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password=owner.password)
# We may have ConnectionRefusedError if we don't have a
# connection to OpenNebula. For now, we raise ServiceUnavailable
try:
manager.delete_vm(instance.id)
except ConnectionRefusedError:
raise ServiceUnavailable