1 files changed, 119 insertions, 0 deletions
diff --git a/src/knot/zone/timers.h b/src/knot/zone/timers.h
new file mode 100644
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+++ b/src/knot/zone/timers.h
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+/*  Copyright (C) 2017 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 <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <time.h>
+
+#include "libknot/db/db.h"
+#include "libknot/dname.h"
+
+/*!
+ * \brief Persistent zone timers.
+ */
+struct zone_timers {
+	uint32_t soa_expire;     //!< SOA expire value.
+	time_t last_flush;       //!< Last zone file synchronization.
+	time_t last_refresh;     //!< Last successful zone refresh attempt.
+	time_t next_refresh;     //!< Next zone refresh attempt.
+	time_t last_resalt;      //!< Last NSEC3 resalt
+	time_t next_parent_ds_q; //!< Next parent ds query
+};
+
+typedef struct zone_timers zone_timers_t;
+
+/*!
+ * \brief Open zone timers database.
+ *
+ * \param[in]  path     Path to a directory with the database.
+ * \param[out] db       Created database.
+ * \param[in]  mapsize  LMDB mapsize.
+ *
+ * \return KNOT_E*
+ */
+int zone_timers_open(const char *path, knot_db_t **db, size_t mapsize);
+
+/*!
+ * \brief Closes zone timers database.
+ *
+ * \param db  Timer database.
+ */
+void zone_timers_close(knot_db_t *db);
+
+/*!
+ * \brief Load timers for one zone.
+ *
+ * \param[in]  db      Timer database.
+ * \param[in]  zone    Zone name.
+ * \param[out] timers  Loaded timers
+ *
+ * \return KNOT_E*
+ * \retval KNOT_ENOENT  Zone not found in the database.
+ */
+int zone_timers_read(knot_db_t *db, const knot_dname_t *zone,
+                     zone_timers_t *timers);
+
+/*!
+ * \brief Init txn for zone_timers_write()
+ *
+ * \param db      Timer database.
+ * \param txn     Handler to be initialized.
+ *
+ * \return KNOT_E*
+ */
+int zone_timers_write_begin(knot_db_t *db, knot_db_txn_t *txn);
+
+/*!
+ * \brief Close txn for zone_timers_write()
+ *
+ * \param txn     Handler to be closed.
+ *
+ * \return KNOT_E*
+ */
+int zone_timers_write_end(knot_db_txn_t *txn);
+
+/*!
+ * \brief Write timers for one zone.
+ *
+ * \param db      Timer database.
+ * \param zone    Zone name.
+ * \param timers  Loaded timers
+ * \param txn     Transaction handler obtained from zone_timers_write_begin()
+ *
+ * \return KNOT_E*
+ */
+int zone_timers_write(knot_db_t *db, const knot_dname_t *zone,
+                      const zone_timers_t *timers, knot_db_txn_t *txn);
+
+/*!
+ * \brief Callback used in \ref zone_timers_sweep.
+ *
+ * \retval true for zones to preserve.
+ * \retval false for zones to remove.
+ */
+typedef bool (*sweep_cb)(const knot_dname_t *zone, void *data);
+
+/*!
+ * \brief Selectively delete zones from the database.
+ *
+ * \param db         Timer dababase.
+ * \param keep_zone  Filtering callback.
+ * \param cb_data    Data passed to callback function.
+ *
+ * \return KNOT_E*
+ */
+int zone_timers_sweep(knot_db_t *db, sweep_cb keep_zone, void *cb_data);