[Minor] Add auxiliary functions for symbols cache

src/libserver/symbols_cache.c

@@ -2462,3 +2462,16 @@ rspamd_symbols_cache_is_symbol_enabled (struct rspamd_task *task,
 
 	return ret;
 }
+
+void
+rspamd_symbols_cache_foreach (struct symbols_cache *cache,
+		void (*func)(gint , const gchar *, gint , gpointer ),
+		gpointer ud)
+{
+	guint i;
+	struct cache_item *item;
+
+	PTR_ARRAY_FOREACH (cache->items_by_id, i, item) {
+		func (item->id, item->symbol, item->type, ud);
+	}
+}

src/libserver/symbols_cache.h

@@ -40,6 +40,7 @@ enum rspamd_symbol_type {
 	SYMBOL_TYPE_EMPTY = (1 << 8), /* Allow execution on empty tasks */
 	SYMBOL_TYPE_PREFILTER = (1 << 9),
 	SYMBOL_TYPE_POSTFILTER = (1 << 10),
+	SYMBOL_TYPE_NONSTAT = (1 << 11), /* Skip as statistical symbol */
 };
 
 /**
@@ -290,4 +291,15 @@ guint64 rspamd_symbols_cache_get_cksum (struct symbols_cache *cache);
  */
 gboolean rspamd_symbols_cache_is_symbol_enabled (struct rspamd_task *task,
 		struct symbols_cache *cache, const gchar *symbol);
+/**
+ * Process specific function for each cache element (in order they are added)
+ * @param cache
+ * @param func
+ * @param ud
+ */
+void rspamd_symbols_cache_foreach (struct symbols_cache *cache,
+		void (*func)(gint /* id */, const gchar * /* name */,
+				gint /* flags */, gpointer /* userdata */),
+		gpointer ud);
+
 #endif