check for nulls

lib/cartodb/cache_validator.js

@@ -39,7 +39,8 @@ function generateCacheChannel(req, callback){
             callback(channelCache[sql_md5]);
         } else{
             // strip out windshaft/mapnik inserted sql
-            var sql = req.params.sql.match(/^\((.*)\)\sas\scdbq$/)[1];
+            var sql = req.params.sql.match(/^\((.*)\)\sas\scdbq$/);
+            sql = (sql != null) ? sql[1] : req.params.sql;
 
             // build up api string
             var sqlapi = api.protocol + '://' + username + '.' + api.host + ':' + api.port + '/api/' + api.version + '/sql'

test/acceptance/cache_validator.js

@@ -28,8 +28,8 @@ tests['working'] = function() { assert.ok(true); };
 tests['should call purge on varnish when invalidate database'] = function() {
     var varnish = new VarnishEmu(function(cmds) {
         assert.ok(cmds.length == 1);
-        assert.equal('purge obj.http.X-Cache-Channel == test_cache\n', cmds[0]);
+        assert.equal('purge obj.http.X-Cache-Channel == test_db:test_cache\n', cmds[0]);
     });
     CacheValidator.init('localhost', 1337);
-    CacheValidator.invalidate_db('test_cache');
+    CacheValidator.invalidate_db('test_db', 'test_cache');
 }