/*------------------------------------------------------------------------------
*
* Copyright (c) 2011, EURid. All rights reserved.
* The YADIFA TM software product is provided under the BSD 3-clause license:
* 
* Redistribution and use in source and binary forms, with or without 
* modification, are permitted provided that the following conditions
* are met:
*
*        * Redistributions of source code must retain the above copyright 
*          notice, this list of conditions and the following disclaimer.
*        * Redistributions in binary form must reproduce the above copyright 
*          notice, this list of conditions and the following disclaimer in the 
*          documentation and/or other materials provided with the distribution.
*        * Neither the name of EURid nor the names of its contributors may be 
*          used to endorse or promote products derived from this software 
*          without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*------------------------------------------------------------------------------
*
*/
/** @defgroup database Routines for database manipulations
 *  @ingroup yadifad
 *  @brief database functions
 *
 *  Implementation of routines for the database
 *   - add zone file(s)
 *   - clear zone file(s)
 *   - print zone files(s)
 *   - load db
 *   - unload db
 *   - lookup database result of a message
 *
 * @{
 */
/*------------------------------------------------------------------------------
 *
 * USE INCLUDES */

#include "config.h"

#include <dnscore/logger.h>
#include <dnsdb/zdb_zone.h>

#include "zone.h"
#include "server.h"

#define MODULE_MSG_HANDLE g_server_logger

#define DBLOADQ_TAG 0x5144414f4c4244

/**********************************************************************************************************************/

void
database_service_zone_freeze(zone_desc_s *zone_desc)
{
    ya_result return_value;

#ifdef DEBUG
    log_debug("database_service_zone_freeze(%{dnsname}@%p=%i)", zone_desc->origin, zone_desc, zone_desc->rc);
#endif

    if(zone_desc == NULL)
    {
        log_err("zone freeze: NULL zone");
        return;
    }

    log_debug1("database_service_zone_freeze: locking zone '%{dnsname}' for freezing", zone_desc->origin);

    if(FAIL(return_value = zone_lock(zone_desc, ZONE_LOCK_FREEZE)))
    {
        log_err("database_service_zone_freeze: failed to lock zone settings for '%{dnsname}'", zone_desc->origin);
        return;
    }
    
    zdb_zone *zone = zone_desc->loaded_zone;
    
    if(zone == NULL)
    {
        log_err("zone freeze: no zone loaded for '%{dnsname}'", zone_desc->origin);
        zone_desc->status_flags &= ~ZONE_STATUS_PROCESSING;
        
        log_debug1("database_service_zone_freeze: unlocking zone '%{dnsname}' for freezing", zone_desc->origin);
        
        zone_unlock(zone_desc, ZONE_LOCK_FREEZE);
        
        return;
    }
    
    // This REALLY is the simple reader lock.  This operation does not interfere
    // with readers, only with writers.  There is no point preventing queries
    // in the database while setting the zone read-only.
    
    zdb_zone_lock(zone, ZDB_ZONE_MUTEX_SIMPLEREADER);
    
    if((zone->apex->flags & ZDB_RR_APEX_LABEL_FROZEN) != 0)
    {
        log_warn("zone freeze: %{dnsname} already frozen", zone->origin);
    }
    
    zone->apex->flags |= ZDB_RR_APEX_LABEL_FROZEN;
    
    zdb_zone_unlock(zone, ZDB_ZONE_MUTEX_SIMPLEREADER);
    
    log_info("zone freeze: %{dnsname}", zone_desc->origin);
    
    zone_desc->status_flags |= ZONE_STATUS_FROZEN;    
    zone_desc->status_flags &= ~ZONE_STATUS_PROCESSING;
    
    log_debug1("database_service_zone_freeze: unlocking zone '%{dnsname}' for freezing", zone_desc->origin);
    
    zone_unlock(zone_desc, ZONE_LOCK_FREEZE);
}

/**
 * @}
 */
