provide DRF action to run a pi simulation

pi/views.py

@@ -1,12 +1,22 @@
 """Provide pi simulation results."""
-from rest_framework import viewsets
+from rest_framework.decorators import action
+from rest_framework.permissions import IsAuthenticated
+from rest_framework.response import Response
+from rest_framework.viewsets import ReadOnlyModelViewSet
 
 from pi.models import PiLog
 from pi.serializers import PiLogSerializer
 
 
-class PiLogViewSet(viewsets.ReadOnlyModelViewSet):
+class PiLogViewSet(ReadOnlyModelViewSet):
     """Provide list and detail actions for pi simulation log entries."""
 
     queryset = PiLog.objects.all()
     serializer_class = PiLogSerializer
+    permission_classes = [IsAuthenticated]
+
+    @action(detail=False, methods=['post'])
+    def simulate(self, request):
+        """Run one simulation of the pi estimator."""
+        simulation, _, _ = PiLog.objects.simulate()
+        return Response(self.get_serializer(simulation).data)