Make sure we can contact the signer.

apps/amo/monitors.py

@@ -3,6 +3,7 @@ from PIL import Image
 import socket
 import StringIO
 import traceback
+import urllib2
 from urlparse import urlparse
 
 from django.conf import settings
@@ -178,3 +179,19 @@ def hera():
             status = False
 
     return status, hera_results
+
+
+def signer():
+    destination = getattr(settings, 'SIGNING_SERVER', None)
+    if not destination:
+        return True, "Signer is not configured."
+
+    destination += "/1.0/sign"
+    request = urllib2.Request(destination)
+    try:
+        urllib2.urlopen(request)
+    except urllib2.HTTPError, error:
+        if error.code == 405:
+            return True, "%s is working." % destination
+
+    return False, "%s can not be contacted." % destination

apps/amo/templates/services/monitor.html

@@ -118,4 +118,11 @@
   </ul>
 </div>
 
+<div class="notification-box {{ status(status_summary.signer) }}">
+  <h2>[Signer] Connection Test (signer) ({{ signer_timer }}ms)</h2>
+  <ul>
+      <li>{{ signer_results }}</li>
+  </ul>
+</div>
+
 {% endblock main_content %}

apps/amo/views.py

@@ -42,7 +42,7 @@ def monitor(request, format=None):
     status_summary = {}
     results = {}
 
-    checks = ['memcache', 'libraries', 'elastic', 'path', 'redis', 'hera']
+    checks = ['memcache', 'libraries', 'elastic', 'path', 'redis', 'hera', 'signer']
 
     for check in checks:
         with statsd.timer('monitor.%s' % check) as timer: