source: trunk/server/source4/dsdb/repl/drepl_periodic.c

/* 
   Unix SMB/CIFS mplementation.
   DSDB replication service periodic handling
   
   Copyright (C) Stefan Metzmacher 2007
    
   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/>.
   
*/

#include "includes.h"
#include "lib/events/events.h"
#include "dsdb/samdb/samdb.h"
#include "auth/auth.h"
#include "smbd/service.h"
#include "dsdb/repl/drepl_service.h"
#include <ldb_errors.h>
#include "../lib/util/dlinklist.h"
#include "librpc/gen_ndr/ndr_misc.h"
#include "librpc/gen_ndr/ndr_drsuapi.h"
#include "librpc/gen_ndr/ndr_drsblobs.h"

static void dreplsrv_periodic_run(struct dreplsrv_service *service);

static void dreplsrv_periodic_handler_te(struct tevent_context *ev, struct tevent_timer *te,
                                         struct timeval t, void *ptr)
{
        struct dreplsrv_service *service = talloc_get_type(ptr, struct dreplsrv_service);
        WERROR status;

        service->periodic.te = NULL;

        dreplsrv_periodic_run(service);

        status = dreplsrv_periodic_schedule(service, service->periodic.interval);
        if (!W_ERROR_IS_OK(status)) {
                task_server_terminate(service->task, win_errstr(status), false);
                return;
        }
}

WERROR dreplsrv_periodic_schedule(struct dreplsrv_service *service, uint32_t next_interval)
{
        TALLOC_CTX *tmp_mem;
        struct tevent_timer *new_te;
        struct timeval next_time;

        /* prevent looping */
        if (next_interval == 0) next_interval = 1;

        next_time = timeval_current_ofs(next_interval, 50);

        if (service->periodic.te) {
                /*
                 * if the timestamp of the new event is higher,
                 * as current next we don't need to reschedule
                 */
                if (timeval_compare(&next_time, &service->periodic.next_event) > 0) {
                        return WERR_OK;
                }
        }

        /* reset the next scheduled timestamp */
        service->periodic.next_event = next_time;

        new_te = event_add_timed(service->task->event_ctx, service,
                                 service->periodic.next_event,
                                 dreplsrv_periodic_handler_te, service);
        W_ERROR_HAVE_NO_MEMORY(new_te);

        tmp_mem = talloc_new(service);
        DEBUG(4,("dreplsrv_periodic_schedule(%u) %sscheduled for: %s\n",
                next_interval,
                (service->periodic.te?"re":""),
                nt_time_string(tmp_mem, timeval_to_nttime(&next_time))));
        talloc_free(tmp_mem);

        talloc_free(service->periodic.te);
        service->periodic.te = new_te;

        return WERR_OK;
}

static void dreplsrv_periodic_run(struct dreplsrv_service *service)
{
        TALLOC_CTX *mem_ctx;

        DEBUG(4,("dreplsrv_periodic_run(): schedule pull replication\n"));

        /*
         * KCC or some administrative tool
         * might have changed Topology graph
         * i.e. repsFrom/repsTo
         */
        dreplsrv_refresh_partitions(service);

        mem_ctx = talloc_new(service);
        dreplsrv_schedule_pull_replication(service, mem_ctx);
        talloc_free(mem_ctx);

        DEBUG(4,("dreplsrv_periodic_run(): run pending_ops memory=%u\n", 
                 (unsigned)talloc_total_blocks(service)));

        dreplsrv_ridalloc_check_rid_pool(service);

        dreplsrv_run_pending_ops(service);
}

/*
  run the next pending op, either a notify or a pull
 */
void dreplsrv_run_pending_ops(struct dreplsrv_service *s)
{
        if (!s->ops.notifies && !s->ops.pending) {
                return;
        }
        if (!s->ops.notifies ||
            (s->ops.pending &&
             s->ops.notifies->schedule_time > s->ops.pending->schedule_time)) {
                dreplsrv_run_pull_ops(s);
        } else {
                dreplsrv_notify_run_ops(s);
        }
}