mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
synced 2025-03-16 00:00:02 +01:00
146 lines
3.3 KiB
C++
146 lines
3.3 KiB
C++
/** Skip first 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 <villas/hook.hpp>
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#include <villas/timing.h>
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#include <villas/sample.h>
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namespace villas {
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namespace node {
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class SkipFirstHook : public Hook {
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protected:
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enum {
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HOOK_SKIP_FIRST_STATE_STARTED, /**< Path just started. First sample not received yet. */
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HOOK_SKIP_FIRST_STATE_SKIPPING, /**< First sample received. Skipping samples now. */
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HOOK_SKIP_FIRST_STATE_NORMAL /**< All samples skipped. Normal operation. */
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} skip_state;
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enum {
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HOOK_SKIP_MODE_SECONDS,
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HOOK_SKIP_MODE_SAMPLES
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} mode;
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union {
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struct {
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timespec until;
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timespec wait; /**< Absolute point in time from where we accept samples. */
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} seconds;
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struct {
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uint64_t until;
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int wait;
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} samples;
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};
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public:
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using Hook::Hook;
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virtual void parse(json_t *cfg)
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{
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double s;
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int ret;
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json_error_t err;
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assert(state != STATE_STARTED);
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ret = json_unpack_ex(cfg, &err, 0, "{ s: F }", "seconds", &s);
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if (!ret) {
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seconds.wait = time_from_double(s);
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mode = HOOK_SKIP_MODE_SECONDS;
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state = STATE_PARSED;
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return;
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}
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ret = json_unpack_ex(cfg, &err, 0, "{ s: i }", "samples", &samples.wait);
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if (!ret) {
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mode = HOOK_SKIP_MODE_SAMPLES;
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state = STATE_PARSED;
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return;
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}
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throw ConfigError(cfg, err, "node-config-hook-skip_first");
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}
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virtual void restart()
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{
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skip_state = HOOK_SKIP_FIRST_STATE_STARTED;
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}
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virtual int process(sample *smp)
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{
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assert(state == STATE_STARTED);
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/* Remember sequence no or timestamp of first sample. */
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if (skip_state == HOOK_SKIP_FIRST_STATE_STARTED) {
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switch (mode) {
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case HOOK_SKIP_MODE_SAMPLES:
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samples.until = smp->sequence + samples.wait;
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break;
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case HOOK_SKIP_MODE_SECONDS:
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seconds.until = time_add(&smp->ts.origin, &seconds.wait);
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break;
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}
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skip_state = HOOK_SKIP_FIRST_STATE_SKIPPING;
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}
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switch (mode) {
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case HOOK_SKIP_MODE_SAMPLES:
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if (samples.until > smp->sequence)
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return HOOK_SKIP_SAMPLE;
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break;
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case HOOK_SKIP_MODE_SECONDS:
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if (time_delta(&seconds.until, &smp->ts.origin) < 0)
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return HOOK_SKIP_SAMPLE;
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break;
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default:
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break;
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}
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return HOOK_OK;
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}
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};
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/* Register hook */
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static HookPlugin<SkipFirstHook> p(
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"skip_first",
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"Skip the first samples",
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HOOK_NODE_READ | HOOK_NODE_WRITE | HOOK_PATH,
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99
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);
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} /* namespace node */
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} /* namespace villas */
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/** @} */
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