mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
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89 lines
No EOL
2.2 KiB
C
89 lines
No EOL
2.2 KiB
C
/** Drop hook.
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*
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* @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
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* @copyright 2017, Institute for Automation of Complex Power Systems, EONERC
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* @license GNU General Public License (version 3)
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*
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* VILLASnode
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*********************************************************************************/
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/** @addtogroup hooks Hook functions
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* @{
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*/
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#include "hook.h"
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#include "plugin.h"
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#include "stats.h"
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#include "path.h"
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static int drop_read(struct hook *h, struct sample *smps[], size_t *cnt)
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{
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int i, ok, dist;
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for (i = 0, ok = 0; i < *cnt; i++) {
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h->last = smps[i];
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if (h->prev) {
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dist = h->last->sequence - (int32_t) h->prev->sequence;
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if (dist <= 0) {
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warn("Dropped sample: sequence=%u, dist=%d, i=%d", h->last->sequence, dist, i);
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if (h->path && h->path->stats)
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stats_update(h->path->stats->delta, STATS_REORDERED, dist);
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}
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else {
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struct sample *tmp;
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tmp = smps[i];
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smps[i] = smps[ok];
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smps[ok++] = tmp;
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}
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/* To discard the first X samples in 'smps[]' we must
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* shift them to the end of the 'smps[]' array.
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* In case the hook returns a number 'ok' which is smaller than 'cnt',
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* only the first 'ok' samples in 'smps[]' are accepted and further processed.
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*/
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}
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else {
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struct sample *tmp;
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tmp = smps[i];
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smps[i] = smps[ok];
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smps[ok++] = tmp;
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}
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h->prev = h->last;
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}
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*cnt = ok;
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return 0;
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}
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static struct plugin p = {
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.name = "drop",
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.description = "Drop messages with reordered sequence numbers",
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.type = PLUGIN_TYPE_HOOK,
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.hook = {
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.priority = 3,
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.builtin = true,
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.read = drop_read
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}
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};
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REGISTER_PLUGIN(&p)
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/** @} */ |