Implement lazy backend writing using sync_ops = 0.

Allways wait for kvstorage worker to prevent data corruption.

src/kvstorage_bdb.c

@@ -199,7 +199,7 @@ rspamd_bdb_insert (struct rspamd_kv_backend *backend, gpointer key, struct rspam
 	g_queue_push_head (db->ops_queue, op);
 	g_hash_table_insert (db->ops_hash, ELT_KEY (elt), op);
 
-	if (g_queue_get_length (db->ops_queue) >= db->sync_ops) {
+	if (db->sync_ops > 0 && g_queue_get_length (db->ops_queue) >= db->sync_ops) {
 		return bdb_process_queue (backend);
 	}
 
@@ -224,7 +224,7 @@ rspamd_bdb_replace (struct rspamd_kv_backend *backend, gpointer key, struct rspa
 	g_queue_push_head (db->ops_queue, op);
 	g_hash_table_insert (db->ops_hash, ELT_KEY (elt), op);
 
-	if (g_queue_get_length (db->ops_queue) >= db->sync_ops) {
+	if (db->sync_ops > 0 && g_queue_get_length (db->ops_queue) >= db->sync_ops) {
 		return bdb_process_queue (backend);
 	}
 
@@ -293,7 +293,7 @@ rspamd_bdb_delete (struct rspamd_kv_backend *backend, gpointer key)
 	g_queue_push_head (db->ops_queue, op);
 	g_hash_table_insert (db->ops_hash, ELT_KEY(elt), op);
 
-	if (g_queue_get_length (db->ops_queue) >= db->sync_ops) {
+	if (db->sync_ops > 0 && g_queue_get_length (db->ops_queue) >= db->sync_ops) {
 		bdb_process_queue (backend);
 	}
 

src/kvstorage_server.c

@@ -790,6 +790,7 @@ start_kvstorage_worker (struct rspamd_worker *worker)
 		}
 	}
 
+	msg_info ("syncing storages");
 	destroy_kvstorage_config ();
 	close_log (rspamd_main->logger);
 	exit (EXIT_SUCCESS);

src/kvstorage_sqlite.c

@@ -262,7 +262,7 @@ rspamd_sqlite_insert (struct rspamd_kv_backend *backend, gpointer key, struct rs
 	g_queue_push_head (db->ops_queue, op);
 	g_hash_table_insert (db->ops_hash, ELT_KEY (elt), op);
 
-	if (g_queue_get_length (db->ops_queue) >= db->sync_ops) {
+	if (db->sync_ops > 0 && g_queue_get_length (db->ops_queue) >= db->sync_ops) {
 		return sqlite_process_queue (backend);
 	}
 
@@ -287,7 +287,7 @@ rspamd_sqlite_replace (struct rspamd_kv_backend *backend, gpointer key, struct r
 	g_queue_push_head (db->ops_queue, op);
 	g_hash_table_insert (db->ops_hash, ELT_KEY (elt), op);
 
-	if (g_queue_get_length (db->ops_queue) >= db->sync_ops) {
+	if (db->sync_ops > 0 && g_queue_get_length (db->ops_queue) >= db->sync_ops) {
 		return sqlite_process_queue (backend);
 	}
 
@@ -357,7 +357,7 @@ rspamd_sqlite_delete (struct rspamd_kv_backend *backend, gpointer key)
 	g_queue_push_head (db->ops_queue, op);
 	g_hash_table_insert (db->ops_hash, ELT_KEY(elt), op);
 
-	if (g_queue_get_length (db->ops_queue) >= db->sync_ops) {
+	if (db->sync_ops > 0 && g_queue_get_length (db->ops_queue) >= db->sync_ops) {
 		sqlite_process_queue (backend);
 	}
 

src/main.c

@@ -615,9 +615,16 @@ wait_for_workers (gpointer key, gpointer value, gpointer unused)
 
 	if (waitpid (w->pid, &res, 0) == -1) {
 		if (errno == EINTR) {
-			msg_info ("terminate worker %P with SIGKILL", w->pid);
-			kill (w->pid, SIGKILL);
 			got_alarm = 1;
+			if (w->type != TYPE_KVSTORAGE) {
+				msg_info ("terminate worker %P with SIGKILL", w->pid);
+				kill (w->pid, SIGKILL);
+			}
+			else {
+				msg_info ("waiting for storages to sync");
+				wait_for_workers (key, value, unused);
+				return TRUE;
+			}
 		}
 	}