mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
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112 lines
2.4 KiB
C
112 lines
2.4 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 2014-2019, 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 <inttypes.h>
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#include <villas/hook.h>
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#include <villas/plugin.h>
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#include <villas/stats.h>
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#include <villas/node.h>
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#include <villas/sample.h>
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struct drop {
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struct sample *prev;
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};
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static int drop_start(struct hook *h)
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{
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struct drop *d = (struct drop *) h->_vd;
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d->prev = NULL;
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return 0;
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}
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static int drop_stop(struct hook *h)
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{
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struct drop *d = (struct drop *) h->_vd;
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if (d->prev)
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sample_decref(d->prev);
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return 0;
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}
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static int drop_process(struct hook *h, struct sample *smp)
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{
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int dist;
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struct drop *d = (struct drop *) h->_vd;
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if (d->prev) {
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dist = smp->sequence - (int64_t) d->prev->sequence;
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if (dist <= 0) {
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debug(10, "Dropping reordered sample: sequence=%" PRIu64 ", distance=%d", smp->sequence, dist);
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return HOOK_SKIP_SAMPLE;
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}
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}
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sample_incref(smp);
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if (d->prev)
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sample_decref(d->prev);
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d->prev = smp;
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return HOOK_OK;
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}
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static int drop_restart(struct hook *h)
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{
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struct drop *d = (struct drop *) h->_vd;
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if (d->prev) {
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sample_decref(d->prev);
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d->prev = NULL;
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}
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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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.flags = HOOK_BUILTIN | HOOK_NODE_READ,
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.priority = 3,
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.process = drop_process,
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.start = drop_start,
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.stop = drop_stop,
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.restart = drop_restart,
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.size = sizeof(struct drop)
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}
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};
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REGISTER_PLUGIN(&p)
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/** @} */
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