Make sure node hostname is unique

apps/clustering/migrations/0007_auto__add_unique_node_hostname.py

@@ -0,0 +1,40 @@
+# -*- coding: utf-8 -*-
+import datetime
+from south.db import db
+from south.v2 import SchemaMigration
+from django.db import models
+
+
+class Migration(SchemaMigration):
+
+    def forwards(self, orm):
+        # Adding unique constraint on 'Node', fields ['hostname']
+        db.create_unique('clustering_node', ['hostname'])
+
+
+    def backwards(self, orm):
+        # Removing unique constraint on 'Node', fields ['hostname']
+        db.delete_unique('clustering_node', ['hostname'])
+
+
+    models = {
+        'clustering.clusteringconfig': {
+            'Meta': {'object_name': 'ClusteringConfig'},
+            'dead_node_removal_interval': ('django.db.models.fields.PositiveIntegerField', [], {'default': '10'}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'lock_id': ('django.db.models.fields.CharField', [], {'default': '1', 'unique': 'True', 'max_length': '1'}),
+            'node_heartbeat_interval': ('django.db.models.fields.PositiveIntegerField', [], {'default': '10'}),
+            'node_heartbeat_timeout': ('django.db.models.fields.PositiveIntegerField', [], {'default': '60'})
+        },
+        'clustering.node': {
+            'Meta': {'object_name': 'Node'},
+            'cpuload': ('django.db.models.fields.FloatField', [], {'default': '0', 'blank': 'True'}),
+            'heartbeat': ('django.db.models.fields.DateTimeField', [], {'default': 'datetime.datetime(2012, 8, 3, 0, 0)', 'blank': 'True'}),
+            'hostname': ('django.db.models.fields.CharField', [], {'unique': 'True', 'max_length': '255'}),
+            'id': ('django.db.models.fields.AutoField', [], {'primary_key': 'True'}),
+            'memory_usage': ('django.db.models.fields.FloatField', [], {'default': '0', 'blank': 'True'}),
+            'state': ('django.db.models.fields.CharField', [], {'default': "'d'", 'max_length': '4'})
+        }
+    }
+
+    complete_apps = ['clustering']

apps/clustering/models.py

@@ -29,7 +29,7 @@ class NodeManager(models.Manager):
 
 
 class Node(models.Model):
-    hostname = models.CharField(max_length=255, verbose_name=_(u'hostname'))
+    hostname = models.CharField(max_length=255, verbose_name=_(u'hostname'), unique=True)
     cpuload = models.FloatField(blank=True, default=DEFAULT_NODE_CPU_LOAD, verbose_name=_(u'cpu load'))
     heartbeat = models.DateTimeField(blank=True, default=datetime.datetime.now(), verbose_name=_(u'last heartbeat check'))
     memory_usage = models.FloatField(blank=True, default=DEFAULT_NODE_MEMORY_USAGE, verbose_name=_(u'memory usage'))