Don't throw an exception when the graphite server is unreachable

coin/vpn/views.py

@@ -2,9 +2,9 @@
 from __future__ import unicode_literals
 
 import os
-from urllib2 import urlopen
+import urllib2
 
-from django.http import StreamingHttpResponse
+from django.http import StreamingHttpResponse, HttpResponseServerError
 from django.shortcuts import render_to_response, get_object_or_404
 from django.views.generic.detail import DetailView
 from django.views.generic.edit import UpdateView
@@ -72,4 +72,7 @@ def get_graph(request, vpn_id, period="daily"):
                 "target=alias%%28scaleToSeconds%%28vpn1.%(login)s.uptxbytes%%2C1%%29%%2C%%20%%22Upload%%22%%29&" \
                 "title=VPN%%20Usage%%20%(login)s" % \
                     { 'period': time_periods[period], 'login': vpn.login })
-    return StreamingHttpResponse(urlopen(graph_url), content_type="image/png")
+    try:
+        return StreamingHttpResponse(urllib2.urlopen(graph_url), content_type="image/png")
+    except urllib2.URLError:
+        return HttpResponseServerError()