Add lsquic_engine_get_conns_count api to return current engine's conn…

…ection count (#517)

Co-authored-by: Alex Pokotilo <[email protected]>

include/lsquic.h

@@ -1438,6 +1438,12 @@ lsquic_engine_packet_in (lsquic_engine_t *,
         const struct sockaddr *sa_local, const struct sockaddr *sa_peer,
         void *peer_ctx, int ecn);
 
+/**
+ * Returns current number of connections processed by the engine. Both mini and full connections included
+ */
+unsigned
+lsquic_engine_get_conns_count (lsquic_engine_t *engine);
+
 /**
  * Process tickable connections.  This function must be called often enough so
  * that packets and connections do not expire.

src/liblsquic/lsquic_engine.c

@@ -2213,6 +2213,11 @@ drop_all_mini_conns (lsquic_engine_t *engine)
     cub_flush(&cub);
 }
 
+unsigned
+lsquic_engine_get_conns_count (lsquic_engine_t *engine)
+{
+    return engine->n_conns;
+}
 
 void
 lsquic_engine_process_conns (lsquic_engine_t *engine)