Improved record deletion performance

Up to now when selecting multiple resource records for deletion for each of
them a single message has been sent to the DNS server. This commit changes the
behavior to put all requested deletions into a single message, which improves
performance.

binder/helpers.py

@@ -80,7 +80,7 @@ def add_cname_record(dns_server, zone_name, cname, originating_record, ttl, key_
     return [{ "description" : "CNAME %s.%s points to %s" % (cname, zone_name, originating_record),
               "output" : output}]
 
-def delete_record(dns_server, rr_list, key_name):
+def delete_record(dns_server, zone_name, rr_list, key_name):
     """Delete a list of DNS records passed as strings in rr_items."""
 
     try:
@@ -92,17 +92,16 @@ def delete_record(dns_server, rr_list, key_name):
         keyring = transfer_key.create_keyring()
         algorithm = transfer_key.algorithm
 
-    delete_response = []
-    for current_rr in rr_list:
-        record_list = current_rr.split(".")
-        record = record_list[0]
-        domain = ".".join(record_list[1:])
-        dns_update = dns.update.Update(domain, keyring=keyring, keyalgorithm=algorithm)
-        dns_update.delete(record)
-        output = send_dns_update(dns_update, dns_server, key_name)
+    dns_update = dns.update.Update(zone_name, keyring=keyring, keyalgorithm=algorithm)
+    records = []
+    for resource_record in rr_list:
+        dns_update.delete(resource_record)
+        records.append("%s.%s" % (zone_name, resource_record))
 
-        delete_response.append({ "description" : "Delete Record: %s" % current_rr,
-                                 "output" : output })
+    output = send_dns_update(dns_update, dns_server, key_name)
+    delete_response = [{"description": "Deleted Records:<br/>%s" %
+                        '<br />'.join(records),
+                        "output": output}]
 
     return delete_response
 

binder/templates/bcommon/list_zone.htm

@@ -22,7 +22,7 @@
 <input type="hidden" name="zone_name" value="{{ zone_name }}">
 {% for current_record in zone_array %}
 <tr>
-  <td><input type="checkbox" name="rr_list" value="{{ current_record.rr_name }}.{{ zone_name }}"></td>
+  <td><input type="checkbox" name="rr_list" value="{{ current_record.rr_name }}"></td>
   <td>{{ current_record.rr_name }}</td>
   <td>{{ current_record.rr_ttl }}</td>
   <td>{{ current_record.rr_class }}</td>

binder/templates/bcommon/response_result.htm

@@ -10,7 +10,7 @@
   <th>Output</th>
 </tr>
 <tr>
-  <td>{{ current_response.description }}</td>
+  <td>{{ current_response.description|safe }}</td>
   <td><pre>{{ current_response.output }}</pre></td>
 </tr>
 {% endfor %}

binder/views.py

@@ -204,6 +204,7 @@ def view_delete_result(request):
         print "in view_delete_result, form errors: %r" % form.errors
 
     delete_result = helpers.delete_record(clean_form["dns_server"],
+                                          clean_form["zone_name"],
                                           clean_form["rr_list"],
                                           clean_form["key_name"])