Support re_cache statistics

src/libserver/re_cache.c

 	guchar *checked;
 	guchar *results;
 	struct rspamd_re_cache *cache;
+	struct rspamd_re_cache_stat stat;
 };
 
 static GQuark
 	return rt;
 }
 
+const struct rspamd_re_cache_stat *
+rspamd_re_cache_get_stat (struct rspamd_re_runtime *rt)
+{
+	g_assert (rt != NULL);
+
+	return &rt->stat;
+}
+
 static guint
 rspamd_re_cache_process_pcre (struct rspamd_re_runtime *rt,
 		rspamd_regexp_t *re, const guchar *in, gsize len,
 		}
 	}
 
+	rt->stat.regexp_checked ++;
+	rt->stat.bytes_scanned_pcre += len;
+	rt->stat.bytes_scanned += len;
+
+	if (r > 0) {
+		rt->stat.regexp_matched ++;
+	}
+
 	return r;
 }
 
 				to - from,
 				FALSE);
 	}
+	else {
+		rt->stat.regexp_matched++;
+	}
 
 	setbit (rt->checked, id);
 
 		cbdata.in = in;
 		cbdata.re = re;
 		cbdata.rt = rt;
+		rt->stat.bytes_scanned += len;
 
 		if ((hs_scan (re_class->hs_db, in, len, 0, re_class->hs_scratch,
 				rspamd_re_cache_hyperscan_cb, &cbdata)) != HS_SUCCESS) {

src/libserver/re_cache.h

 	RSPAMD_RE_MAX
 };
 
+struct rspamd_re_cache_stat {
+	guint64 bytes_scanned;
+	guint64 bytes_scanned_pcre;
+	guint regexp_checked;
+	guint regexp_matched;
+};
+
 /**
  * Initialize re_cache persistent structure
  */
  */
 struct rspamd_re_runtime* rspamd_re_cache_runtime_new (struct rspamd_re_cache *cache);
 
+/**
+ * Get runtime statistics
+ */
+const struct rspamd_re_cache_stat *
+		rspamd_re_cache_get_stat (struct rspamd_re_runtime *rt);
+
 /**
  * Process regexp runtime and return the result for a specific regexp
  * @param task task object