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/* 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);
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