1 files changed, 101 insertions, 0 deletions
diff --git a/src/knot/updates/apply.h b/src/knot/updates/apply.h
new file mode 100644
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--- /dev/null
+++ b/src/knot/updates/apply.h
@@ -0,0 +1,101 @@
+/*  Copyright (C) 2021 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/>.
+ */
+
+#pragma once
+
+#include "contrib/semaphore.h"
+#include "knot/zone/contents.h"
+#include "knot/updates/changesets.h"
+#include "contrib/ucw/lists.h"
+
+enum {
+	APPLY_STRICT     = 1 << 0, /*!< Apply strictly, don't ignore removing non-existent RRs. */
+	APPLY_UNIFY_FULL = 1 << 1, /*!< When cleaning up successful update, perform full trees nodes unify. */
+};
+
+struct apply_ctx {
+	zone_contents_t *contents;
+	zone_tree_t *node_ptrs;   /*!< Just pointers to the affected nodes in contents. */
+	zone_tree_t *nsec3_ptrs;  /*!< The same for NSEC3 nodes. */
+	zone_tree_t *adjust_ptrs; /*!< Pointers to nodes affected by adjusting. */
+	uint32_t flags;
+	knot_sem_t *cow_mutex;
+};
+
+typedef struct apply_ctx apply_ctx_t;
+
+/*!
+ * \brief Initialize a new context structure.
+ *
+ * \param ctx       Context to be initialized.
+ * \param contents  Zone contents to apply changes onto.
+ * \param flags     Flags to control the application process.
+ *
+ * \return KNOT_E*
+ */
+int apply_init_ctx(apply_ctx_t *ctx, zone_contents_t *contents, uint32_t flags);
+
+/*!
+ * \brief Adds a single RR into zone contents.
+ *
+ * \param ctx  Apply context.
+ * \param rr   RRSet to add.
+ *
+ * \return KNOT_E*
+ */
+int apply_add_rr(apply_ctx_t *ctx, const knot_rrset_t *rr);
+
+/*!
+ * \brief Removes single RR from zone contents.
+ *
+ * \param ctx  Apply context.
+ * \param rr   RRSet to remove.
+ *
+ * \return KNOT_E*
+ */
+int apply_remove_rr(apply_ctx_t *ctx, const knot_rrset_t *rr);
+
+/*!
+ * \brief Remove SOA and add a new SOA.
+ *
+ * \param ctx  Apply context.
+ * \param rr   New SOA to be added.
+ *
+ * \return KNOT_E*
+ */
+int apply_replace_soa(apply_ctx_t *ctx, const knot_rrset_t *rr);
+
+/*!
+ * \brief Cleanups successful zone update.
+ *
+ * \param ctx  Context used to create the update.
+ */
+void apply_cleanup(apply_ctx_t *ctx);
+
+/*!
+ * \brief Rollbacks failed zone update.
+ *
+ * \param ctx  Context used to create the update.
+ */
+void apply_rollback(apply_ctx_t *ctx);
+
+/*!
+ * \brief Shallow frees zone contents - either shallow copy after failed update
+ *        or original zone contents after successful update.
+ *
+ * \param contents  Contents to free.
+ */
+void update_free_zone(zone_contents_t *contents);