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VILLASnode/lib/hooks/limit_rate.cpp
Steffen Vogel 7eec1bb753 update Steffens mail address
Signed-off-by: Steffen Vogel <post@steffenvogel.de>
2022-12-16 23:44:07 +01:00

85 lines
1.8 KiB
C++

/** Rate-limiting hook.
*
* @author Steffen Vogel <post@steffenvogel.de>
* @copyright 2014-2022, Institute for Automation of Complex Power Systems, EONERC
* @license Apache 2.0
*********************************************************************************/
#include <cstring>
#include <villas/timing.hpp>
#include <villas/sample.hpp>
#include <villas/hooks/limit_rate.hpp>
namespace villas {
namespace node {
void LimitRateHook::parse(json_t *json)
{
int ret;
json_error_t err;
assert(state != State::STARTED);
double rate;
const char *m = nullptr;
Hook::parse(json);
ret = json_unpack_ex(json, &err, 0, "{ s: F, s?: s }",
"rate", &rate,
"mode", &m
);
if (ret)
throw ConfigError(json, err, "node-config-hook-limit_rate");
if (m) {
if (!strcmp(m, "origin"))
mode = LIMIT_RATE_ORIGIN;
else if (!strcmp(m, "received"))
mode = LIMIT_RATE_RECEIVED;
else if (!strcmp(m, "local"))
mode = LIMIT_RATE_LOCAL;
else
throw ConfigError(json, "node-config-hook-limit_rate-mode", "Invalid value '{}' for setting 'mode'", mode);
}
deadtime = 1.0 / rate;
state = State::PARSED;
}
Hook::Reason LimitRateHook::process(struct Sample *smp)
{
assert(state == State::STARTED);
timespec next;
switch (mode) {
case LIMIT_RATE_LOCAL:
next = time_now();
break;
case LIMIT_RATE_ORIGIN:
next = smp->ts.origin;
break;
case LIMIT_RATE_RECEIVED:
next = smp->ts.received;
break;
}
if (time_delta(&last, &next) < deadtime)
return Hook::Reason::SKIP_SAMPLE;
last = next;
return Reason::OK;
}
/* Register hook */
static char n[] = "limit_rate";
static char d[] = "Limit sending rate";
static HookPlugin<LimitRateHook, n, d, (int) Hook::Flags::NODE_READ | (int) Hook::Flags::NODE_WRITE | (int) Hook::Flags::PATH> p;
} /* namespace node */
} /* namespace villas */