1 files changed, 92 insertions, 0 deletions
diff --git a/src/knot/journal/journal_basic.c b/src/knot/journal/journal_basic.c
new file mode 100644
index 0000000..825130a
--- /dev/null
+++ b/src/knot/journal/journal_basic.c
@@ -0,0 +1,92 @@
+/*  Copyright (C) 2022 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "knot/journal/journal_basic.h"
+#include "knot/journal/journal_metadata.h"
+#include "libknot/error.h"
+
+MDB_val journal_changeset_id_to_key(bool zone_in_journal, uint32_t serial, const knot_dname_t *zone)
+{
+	if (zone_in_journal) {
+		return knot_lmdb_make_key("NIS", zone, (uint32_t)0, "bootstrap");
+	} else {
+		return knot_lmdb_make_key("NII", zone, (uint32_t)0, serial);
+	}
+}
+
+MDB_val journal_make_chunk_key(const knot_dname_t *apex, uint32_t ch_from, bool zij, uint32_t chunk_id)
+{
+	if (zij) {
+		return knot_lmdb_make_key("NISI", apex, (uint32_t)0, "bootstrap", chunk_id);
+	} else {
+		return knot_lmdb_make_key("NIII", apex, (uint32_t)0, ch_from, chunk_id);
+	}
+}
+
+MDB_val journal_zone_prefix(const knot_dname_t *zone)
+{
+	return knot_lmdb_make_key("NI", zone, (uint32_t)0);
+}
+
+void journal_del_zone(knot_lmdb_txn_t *txn, const knot_dname_t *zone)
+{
+	assert(txn->is_rw);
+	MDB_val prefix = journal_zone_prefix(zone);
+	knot_lmdb_del_prefix(txn, &prefix);
+	free(prefix.mv_data);
+}
+
+void journal_make_header(void *chunk, uint32_t ch_serial_to)
+{
+	knot_lmdb_make_key_part(chunk, JOURNAL_HEADER_SIZE, "IILLL", ch_serial_to,
+	                        (uint32_t)0 /* we no longer care for # of chunks */,
+	                        (uint64_t)0, (uint64_t)0, (uint64_t)0);
+}
+
+uint32_t journal_next_serial(const MDB_val *chunk)
+{
+	return knot_wire_read_u32(chunk->mv_data);
+}
+
+bool journal_serial_to(knot_lmdb_txn_t *txn, bool zij, uint32_t serial,
+                       const knot_dname_t *zone, uint32_t *serial_to)
+{
+	MDB_val key = journal_changeset_id_to_key(zij, serial, zone);
+	bool found = knot_lmdb_find_prefix(txn, &key);
+	if (found && serial_to != NULL) {
+		*serial_to = journal_next_serial(&txn->cur_val);
+	}
+	free(key.mv_data);
+	return found;
+}
+
+bool journal_allow_flush(zone_journal_t j)
+{
+	conf_val_t val = conf_zone_get(j.conf, C_ZONEFILE_SYNC, j.zone);
+	return conf_int(&val) >= 0;
+}
+
+size_t journal_conf_max_usage(zone_journal_t j)
+{
+	conf_val_t val = conf_zone_get(j.conf, C_JOURNAL_MAX_USAGE, j.zone);
+	return conf_int(&val);
+}
+
+size_t journal_conf_max_changesets(zone_journal_t j)
+{
+	conf_val_t val = conf_zone_get(j.conf, C_JOURNAL_MAX_DEPTH, j.zone);
+	return conf_int(&val);
+}