Refactored code to introduce different VM templates

hosting/opennebula_functions.py

@@ -14,6 +14,7 @@ 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__)
 
@@ -84,6 +85,7 @@ class HostingManageVMAdmin(admin.ModelAdmin):
             # 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)
 
@@ -232,6 +234,62 @@ class HostingManageVMAdmin(admin.ModelAdmin):
                                  "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 ManageVMView(View):
+    template_name = "hosting/managevms.html"
+    context_object_name = "managevms"
+    model = HostingManageVMAdmin
+        
+    def get(self, *args, **kwargs):
+        form = HostingManageVMsForm()     
+        context = {
+            'vms': model.get_vm_pool(),
+            'form': form,
+        }
+        return TemplateResponse(request, template_name, context)
+        
+        
+
+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():

hosting/templates/hosting/managevms.html

@@ -2,13 +2,9 @@
 {% block content %}
 
 <form action="{% url 'admin:createvm' %}" method="post">
-	{% csrf_token %}
+    {% csrf_token %}
-	<select id="vm_template" name="vm_template">
+    {{ form }}
-		<option value="select">Select a template</option>
+    <input type="submit" name="create_vm" value="Create VM" />
-		<option value="1">disk = 10GB, vcpu=1, ram=1GB</option>
-		<option value="2">disk = 20GB, vcpu=2, ram=2GB</option>
-	</select>
-	<input type="submit" name="create_vm" value="Create VM" />
 </form>
 {% if vms %}
 <section>