Enhance node status feature in overview and nodes

This commit uses the new parameter with_status from nedap/pypuppetdb#18

Node status is now shown as text with the additional information of
failed/succeded events, unreported time

The statistics on Overview now show the *number of nodes*
that have status failed/changed/unreported

puppetboard/app.py

@@ -101,40 +101,35 @@ def index():
         'avg_resources_node': "{0:10.6f}".format(avg_resources_node['Value']),
         }
 
-    latest_event_count = puppetdb._query(
-        'aggregate-event-counts',
-        query='["=", "latest-report?", true]',
-        summarize_by='certname')
+    nodes = puppetdb.nodes(with_status=True)
 
-    latest_event_count['noopskip'] = (
-        latest_event_count['noops'] + latest_event_count['skips'])
+    nodes_overview = []
+    stats = {
+        'changed': 0,
+        'unchanged': 0,
+        'failed': 0,
+        'unreported': 0,
+        }
 
-    latest_events = puppetdb._query(
-        'event-counts',
-        query='["=", "latest-report?", true]',
-        summarize_by='certname')
+    for node in list(nodes):
+        if node.status == 'unreported':
+            stats['unreported'] += 1
+        elif node.status == 'changed':
+            stats['changed'] += 1
+        elif node.status == 'failed':
+            stats['failed'] += 1
+        else:
+            stats['unchanged'] += 1
 
-    unreported = []
-    unresponsive_window = datetime.utcnow() - (
-        timedelta(hours=app.config['UNRESPONSIVE_HOURS']))
-    for node in puppetdb.nodes():
-        try:
-            node_last_seen = node.report_timestamp.replace(tzinfo=None)
-            if node_last_seen < unresponsive_window:
-                delta = (datetime.utcnow() - node_last_seen)
-                node.noresponse = str(delta.days) + "d "
-                node.noresponse += str(int(delta.seconds / 3600)) + "h "
-                node.noresponse += str(int((delta.seconds % 3600) / 60)) + "m"
-                unreported.append(node)
-        except AttributeError:
-            unreported.append(node)
+        if node.status != 'unchanged':
+            nodes_overview.append(node)
 
     return render_template(
         'index.html',
         metrics=metrics,
-        latest_event_count=latest_event_count,
-        latest_events=latest_events,
-        unreported=unreported)
+        nodes=nodes_overview,
+        stats=stats
+        )
 
 
 @app.route('/nodes')
@@ -169,7 +164,7 @@ def nodes():
                 nodes.append(node)
         else:
             nodes.append(node)
-
+    nodes = puppetdb.nodes(with_status=True)
     return Response(stream_with_context(
         stream_template('nodes.html', nodes=nodes)))