final changes for 2.0 release

Master/master/resources/history_graph.py

@@ -0,0 +1,46 @@
+from flask_restful import Resource
+from pygal.style import Style
+from master import ctx
+import pygal
+import timeago
+from math import ceil
+
+class HistoryGraph(Resource):
+    def get(self, history_count):
+        try:
+            custom_style = Style(
+            background='transparent',
+            plot_background='transparent',
+            foreground='rgba(109, 118, 126, 0.3)',
+            foreground_strong='rgba(109, 118, 126, 0.3)',
+            foreground_subtle='rgba(109, 118, 126, 0.3)',
+            opacity='0.1',
+            opacity_hover='0.2',
+            transition='100ms ease-in',
+            colors=('#007acc', '#749363')
+            )
+
+            graph = pygal.StackedLine(
+                interpolate='cubic', 
+                interpolation_precision=3, 
+                #x_labels_major_every=100,
+                #x_labels_major_count=500, 
+                stroke_style={'width': 0.4}, 
+                show_dots=False, 
+                show_legend=False, 
+                fill=True, 
+                style=custom_style, 
+                disable_xml_declaration=True)
+            
+            instance_count = [history['time'] for history in ctx.history.instance_history][-history_count:]
+            
+            if len(instance_count) > 0:
+                graph.x_labels = [ timeago.format(instance_count[0])]
+
+            graph.add('Instance Count', [history['count'] for history in ctx.history.instance_history][-history_count:])
+            graph.add('Client Count', [history['count'] for history in ctx.history.client_history][-history_count:])
+            return { 'message' :  graph.render(), 
+                     'data_points' : len(instance_count)
+                   }, 200
+        except Exception as e:
+            return { 'message' : str(e) }, 500