Fix memory leaks in dcdbquery & compiler error.

DCDBTools/dcdbquery/query.cpp

@@ -86,6 +86,8 @@ void DCDBQuery::lookupPublishedSensorPattern(CassSession* session, std::string n
   statement = cass_prepared_bind(prepared);
   cass_statement_bind_string_by_name(statement, "name", cass_string_init(name.c_str()));
 
+  cass_future_free(future);
+
   future = cass_session_execute(session, statement);
   cass_future_wait(future);
 
@@ -109,6 +111,9 @@ void DCDBQuery::lookupPublishedSensorPattern(CassSession* session, std::string n
       cass_result_free(result);
       cass_iterator_free(iterator);
   }
+  cass_future_free(future);
+  cass_statement_free(statement);
+  cass_prepared_free(prepared);
 }
 
 void DCDBQuery::expandSensorPattern(CassSession* session, std::string sensorPattern, DCDBTimeStamp start, DCDBTimeStamp end, std::list<SensorId>& sensorIds)
@@ -171,6 +176,8 @@ void DCDBQuery::expandSensorPattern(CassSession* session, std::string sensorPatt
   cass_statement_bind_bytes(statement, 0, lowCb);
   cass_statement_bind_bytes(statement, 1, highCb);
 
+  cass_future_free(future);
+
   future = cass_session_execute(session, statement);
   cass_future_wait(future);
 
@@ -299,9 +306,15 @@ void DCDBQuery::querySensorsCSV(CassSession* session, std::string sensorName, st
   query << ";";
 
   CassString csQuery = cass_string_init(query.str().c_str());
+
+  // HACK = sometimes the query fails for unknown reasons
+  int retries_left = 10;
+  while (retries_left) {
     CassStatement* statement = cass_statement_new(csQuery, 0);
     CassFuture* future = cass_session_execute(session, statement);
 
+    cass_future_wait(future);
+
     if (cass_future_error_code(future) == CASS_OK) {
         const CassResult* result = cass_future_get_result(future);
         CassIterator* rows = cass_iterator_from_result(result);
@@ -324,7 +337,22 @@ void DCDBQuery::querySensorsCSV(CassSession* session, std::string sensorName, st
                 std::cout << sensorName << "," << t.getString() << "," << std::dec << value << std::endl;
             }
         }
+        cass_iterator_free(rows);
+        cass_statement_free(statement);
+        cass_future_free(future);
+
+        break;
+    }
+    else {
+         retries_left--;
+	 sleep(1);
+         // CassString message = cass_future_error_message(future);
+	 // fprintf(stderr, "Error: %.*s\n", (int)message.length, message.data);
     }
     cass_statement_free(statement);
     cass_future_free(future);
+  }
+  if (retries_left == 0) {
+	  fprintf(stderr, "Error reading data. Please try again later.\n");
+  }
 }