db_sync: троттлинг push к спящему пиру в тихом чате

src/chat/db_sync.c

@@ -25,6 +25,7 @@
 // ---- Forward declarations ----
 struct DB_SYNC;
 struct DB_SYNC_INSTANCE;
+struct SI_PEER;
 
 static void db_sync_recv_cb(struct ETCP_CONN* conn, struct ll_entry* entry);
 static void db_sync_on_conn_status(struct ETCP_CONN* conn, int status, void* arg);
@@ -38,6 +39,7 @@ static int  db_sync_send_gid(struct DB_SYNC* db, uint64_t node_id, uint64_t grou
 static void db_sync_initiate_sync(struct DB_SYNC_INSTANCE* si, uint64_t peer_node_id);
 static int  si_send_data_batch(struct DB_SYNC_INSTANCE* si, uint64_t dst, uint32_t from, uint32_t count, uint32_t vp, uint32_t want_from);
 static void si_delivery_update(struct DB_SYNC_INSTANCE* si, uint64_t ts, uint64_t author, uint64_t peer_id);
+static int  db_sync_peer_throttled(struct DB_SYNC* db, struct SI_PEER* p);
 
 // ============================================================
 // Structures
@@ -674,6 +676,7 @@ static int db_record_insert_cascade(struct DB_SYNC_INSTANCE* si,
     for (int i = 0; i < si->peer_count; i++) {
         uint64_t pid = si->peers[i].node_id;
         if (si->peers[i].sync_state >= 1 && pid != source_peer && pid != my_id) {
+            if (db_sync_peer_throttled(si->db_sync, &si->peers[i])) continue;   /* спящий пир в «тихом» чате — не пушим */
             if (db_sync_send(si, pid, pbuf, poff) >= 0)
                 { si_delivery_update(si, rts, rauthor, pid); push_count++; }
         }