mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
synced 2025-03-09 00:00:00 +01:00
130 lines
2.6 KiB
C++
130 lines
2.6 KiB
C++
/** Skip first hook.
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*
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* @author Steffen Vogel <post@steffenvogel.de>
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* @copyright 2014-2022, Institute for Automation of Complex Power Systems, EONERC
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* @license Apache 2.0
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*********************************************************************************/
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#include <villas/hook.hpp>
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#include <villas/timing.hpp>
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#include <villas/sample.hpp>
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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 class SkipState {
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STARTED, /**< Path just started. First sample not received yet. */
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SKIPPING, /**< First sample received. Skipping samples now. */
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NORMAL /**< All samples skipped. Normal operation. */
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} skip_state;
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enum class Mode {
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SECONDS,
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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 *json)
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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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Hook::parse(json);
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ret = json_unpack_ex(json, &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 = 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(json, &err, 0, "{ s: i }", "samples", &samples.wait);
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if (!ret) {
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mode = Mode::SAMPLES;
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state = State::PARSED;
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return;
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}
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throw ConfigError(json, err, "node-config-hook-skip_first");
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}
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virtual void start()
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{
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skip_state = SkipState::STARTED;
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state = State::STARTED;
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}
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virtual void restart()
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{
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skip_state = SkipState::STARTED;
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}
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virtual Hook::Reason process(struct 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 == SkipState::STARTED) {
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switch (mode) {
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case Mode::SAMPLES:
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samples.until = smp->sequence + samples.wait;
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break;
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case 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 = SkipState::SKIPPING;
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}
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switch (mode) {
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case Mode::SAMPLES:
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if (samples.until > smp->sequence)
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return Hook::Reason::SKIP_SAMPLE;
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break;
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case Mode::SECONDS:
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if (time_delta(&seconds.until, &smp->ts.origin) < 0)
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return Hook::Reason::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 Reason::OK;
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}
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};
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/* Register hook */
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static char n[] = "skip_first";
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static char d[] = "Skip the first samples";
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static HookPlugin<SkipFirstHook, n, d, (int) Hook::Flags::NODE_READ | (int) Hook::Flags::NODE_WRITE | (int) Hook::Flags::PATH> p;
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} /* namespace node */
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} /* namespace villas */
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