fixes #168, test updates when a domain is set to available

conftest.py

@@ -80,6 +80,7 @@ def db_init(db):  # note: db is a predefined fixture and required here to have t
         nameserver_update_algorithm=NAMESERVER_UPDATE_ALGORITHM,
         nameserver_update_secret=NAMESERVER_UPDATE_SECRET,
         public=NAMESERVER_PUBLIC,
+        available=True,
         created_by=u,
     )
     # this is for querying:
@@ -90,6 +91,7 @@ def db_init(db):  # note: db is a predefined fixture and required here to have t
         nameserver_update_algorithm=NAMESERVER_UPDATE_ALGORITHM,
         nameserver_update_secret='invalid=',  # we don't send updates there (and the real key is really secret)
         public=NAMESERVER_PUBLIC,
+        available=True,
         created_by=u2,
     )
     # a Host for api / session update tests

nsupdate/main/dnstools.py

@@ -32,6 +32,7 @@ import dns.query
 import dns.update
 import dns.tsig
 import dns.tsigkeyring
+import dns.exception
 
 from django.utils.timezone import now
 
@@ -98,6 +99,31 @@ def check_ip(ipaddr, keys=('ipv4', 'ipv6')):
     return keys[af == dns.inet.AF_INET6]
 
 
+def check_domain(domain):
+    fqdn = FQDN(host="connectivity-test", domain=domain)
+
+    from .models import Domain
+    d = Domain.objects.get(name=domain)
+    # temporarily set domain to available
+    domain_available_state = d.available
+    d.available = True
+    d.save()
+
+    try:
+        # add to primary
+        add(fqdn, "8.8.8.8")
+        # delete on primary
+        delete(fqdn)
+
+    except (dns.exception.DNSException, ) as e:
+        raise NameServerNotAvailable(str(e))
+
+    finally:
+        # reset domain available
+        d.available = domain_available_state
+        d.save()
+
+
 def add(fqdn, ipaddr, ttl=60):
     """
     intelligent dns adder - first does a lookup on the master server to find

nsupdate/main/forms.py

@@ -4,8 +4,10 @@ form definitions (which fields are available, order, autofocus, ...)
 """
 
 from django import forms
+from django.utils.translation import ugettext_lazy as _
 
 from .models import Host, RelatedHost, Domain, ServiceUpdaterHostConfig
+from .dnstools import check_domain, NameServerNotAvailable
 
 
 class CreateHostForm(forms.ModelForm):
@@ -44,14 +46,33 @@ class EditRelatedHostForm(forms.ModelForm):
 class CreateDomainForm(forms.ModelForm):
     class Meta(object):
         model = Domain
-        fields = ['name', 'nameserver_ip', 'nameserver2_ip', 'nameserver_update_algorithm',
-                  'public', 'available', 'comment']
+        fields = ['name', 'nameserver_ip', 'nameserver2_ip', 'nameserver_update_algorithm', 'comment']
         widgets = {
             'name': forms.widgets.TextInput(attrs=dict(autofocus=None)),
         }
 
 
 class EditDomainForm(forms.ModelForm):
+    def clean(self):
+        cleaned_data = super(EditDomainForm, self).clean()
+
+        if self.cleaned_data['available']:
+            try:
+                check_domain(self.instance.name)
+
+            except (NameServerNotAvailable, ):
+                raise forms.ValidationError(
+                    _("Failed to add/delete a test host on %(domain)s, check your DNS server configuration. "
+                      "This is a requirement for setting the available flag."),
+                    code='invalid',
+                    params={'domain': self.instance.name}
+                )
+
+        if cleaned_data['public'] and not cleaned_data['available']:
+            raise forms.ValidationError(
+                _("Domain must be available to be public"),
+                code='invalid')
+
     class Meta(object):
         model = Domain
         fields = ['comment', 'nameserver_ip', 'nameserver2_ip', 'public', 'available',

nsupdate/main/migrations/0008_auto_20151229_1255.py

@@ -0,0 +1,19 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('main', '0007_auto_20150425_1741'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='domain',
+            name='available',
+            field=models.BooleanField(default=False, help_text="Check if nameserver is available/reachable - if not checked, we'll pause querying/updating this nameserver for a while", verbose_name='available'),
+        ),
+    ]

nsupdate/main/migrations/0009_merge.py

@@ -0,0 +1,15 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('main', '0008_auto_20151228_1342'),
+        ('main', '0008_auto_20151229_1255'),
+    ]
+
+    operations = [
+    ]

nsupdate/main/models.py

@@ -115,7 +115,7 @@ class Domain(models.Model):
     # gets set to False if we have trouble reaching the nameserver
     available = models.BooleanField(
         _("available"),
-        default=True,
+        default=False,
         help_text=_("Check if nameserver is available/reachable - "
                     "if not checked, we'll pause querying/updating this nameserver for a while"))
     comment = models.CharField(