fix: handle case where taxo cache is empty (#53)

server/src/manager.rs

@@ -185,7 +185,9 @@ impl Manager {
 
  // thread local cache for this specific chunk of directives
  let sid_cache = cache::create_sid_cache(&c);
+ let sid_cache_enabled = !sid_cache.is_empty();
  let taxo_cache = cache::create_taxo_cache(&c);
+ let taxo_cache_enabled = !taxo_cache.is_empty();
 
  loop {
  let mut event = match rx.blocking_recv() {
@@ -201,16 +203,27 @@ impl Manager {
  };
 
  // heuristic to filter out events that are not worth processing
- if (event.plugin_id != 0 && event.plugin_sid != 0 && sid_cache.get(&(event.plugin_id, event.plugin_sid)).is_none()) ||
- (!event.product.is_empty() && !event.category.is_empty() && taxo_cache.get(&(event.product.clone(), event.category.clone())).is_none()) {
+ let mut found = false;
+ if event.plugin_id != 0 && event.plugin_sid != 0 && 
+ sid_cache_enabled && sid_cache.get(&(event.plugin_id, event.plugin_sid)).is_some() {
+ found = true;
+ }
+
+ // check this only when there's no plugin rule match
+ if !found && !event.product.is_empty() && !event.category.is_empty() &&
+ taxo_cache_enabled && taxo_cache.get(&(event.product.clone(), event.category.clone())).is_some() {
+ found = true;
+ }
+
+ if !found {
  trace!(event.id, "event doesn't match any rule, skipping");
- continue;
+ continue; 
  }
 
  // here we just need to find the directive(s) that match the event
  let matched_dirs: Vec<&FilterTarget> =
  c.iter().filter(|p| matched_with_event(p, &event)).collect();
- trace!(
+ info!(
  event.id,
  "event matched rules in {} directive(s)",
  matched_dirs.len()