Initial commit of the generic history app

apps/history/api.py

@@ -0,0 +1,57 @@
+import pickle
+import json
+
+from django.db.utils import DatabaseError
+#from django.utils import simplejson
+from django.core import serializers
+from django.utils.translation import ugettext
+from django.utils.translation import ugettext_lazy as _
+from django.shortcuts import get_object_or_404
+from django.db import models
+
+from history.models import HistoryType, History
+from history.runtime_data import history_types_dict
+
+
+def register_history_type(history_type_dict):
+    namespace = history_type_dict['namespace']
+    name = history_type_dict['name']
+    try:
+        # Permanent
+        history_type_obj, created = HistoryType.objects.get_or_create(
+            namespace=namespace, name=name)
+        history_type_obj.save()
+
+        # Runtime
+        history_types_dict.setdefault(namespace, {})
+        history_types_dict[namespace][name] = {
+            'label': history_type_dict['label'],
+            'summary': history_type_dict.get('summary', u''),
+            'details': history_type_dict.get('details', u''),
+            'expressions': history_type_dict.get('expressions', []),
+        }
+    except DatabaseError:
+        #Special case for ./manage.py syncdb
+        pass
+
+
+def create_history(history_type_dict, source_object=None, data=None):
+    history_type = get_object_or_404(HistoryType, namespace=history_type_dict['namespace'], name=history_type_dict['name'])
+    new_history = History(history_type=history_type)
+    if source_object:
+        new_history.content_object = source_object
+    if data:
+        new_dict = {}
+        for key, value in data.items():
+            new_dict[key] = {}
+            if isinstance(value, models.Model):
+                new_dict[key]['value'] = serializers.serialize('json', [value])
+            elif isinstance(value, models.query.QuerySet):
+                new_dict[key]['value'] = serializers.serialize('json', value)
+            else:
+                new_dict[key]['value'] = json.dumps(value)
+            new_dict[key]['type'] = pickle.dumps(type(value))
+            
+        new_history.dictionary = json.dumps(new_dict)
+    
+    new_history.save()