do not update external XML log if no changes

Author: blackav

lib/serve_2.c

@@ -292,6 +292,21 @@ serve_update_external_xml_log(serve_state_t state,
 {
   if (!state->global->external_xml_update_time) return;
   if (state->current_time < state->last_update_external_xml_log + state->global->external_xml_update_time) return;
+
+  long long runlog_last_update_time_us = run_get_last_update_time_us(state->runlog_state);
+  if (!state->last_update_external_xml_log_us && !runlog_last_update_time_us) {
+    // not updated yet
+
+    struct timeval tv;
+    gettimeofday(&tv, NULL);
+    long long current_time_us = tv.tv_sec * 1000000LL + tv.tv_usec;
+    state->last_update_external_xml_log_us = current_time_us;
+  } else if (state->last_update_external_xml_log_us >= runlog_last_update_time_us) {
+    return;
+  } else {
+    state->last_update_external_xml_log_us = runlog_last_update_time_us;
+  }
+
   state->last_update_external_xml_log = state->current_time;
   do_update_xml_log(state, cnts, "external.xml", 1);
 }