Try dynamically generating some fedmsg config from group/host vars in staging.

filter_plugins/fedmsg.py

@@ -0,0 +1,25 @@
+import operator
+
+
+def invert_fedmsg_authz_policy(vars):
+    """ Given hostvars that map hosts -> topics, invert that
+    and return a dict that maps topics -> hosts.
+
+    Really, returns a list of tuples -- not a dict.
+    """
+
+    inverted = {}
+    for host in vars:
+        prefix = '.'.join([vars[host]['fedmsg_prefix'],
+                           vars[host]['fedmsg_env']])
+        fqdn = vars[host].get('fedmsg_fqdn', vars[host]['ansible_fqdn'])
+
+        for cert in vars[host].get('fedmsg_certs', []):
+            for topic in cert.get('can_send', []):
+                key = prefix + '.' + topic
+                inverted[key] = inverted.get(key, [])
+                inverted[key].append(cert['service'] + '-' + fqdn)
+
+    result = inverted.items()
+    result.sort(key=operator.itemgetter(0))
+    return result