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/*
*
* (C) 2013-22 - ntop.org
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
#ifndef _MONITORED_METRIC_H_
#define _MONITORED_METRIC_H_
template <typename METRICTYPE> class MonitoredMetric {
protected:
METRICTYPE value, last_value, gains, losses;
time_t last_update;
METRICTYPE anomaly_index;
inline void updateAnomalyIndex(time_t when, int64_t delta) {
if(delta > 0)
gains = ewma((METRICTYPE)delta, gains),
losses = ewma(0, losses);
else
gains = ewma(0, gains),
losses = ewma((METRICTYPE)-delta, losses);
anomaly_index = 0;
if(delta /* No variation -> no anomaly */
&& last_update /* Wait at least two points */
&& (gains || losses) /* Meaningless to calculate an anomaly when both are at zero */) {
float gain_loss_ratio = 1;
if (losses != 0)
gain_loss_ratio = (float)(gains) / (float)(losses) + 1;
if (gain_loss_ratio != 0)
anomaly_index = (METRICTYPE)(100 - (100 / (float)(gain_loss_ratio)));
}
#ifdef MONITOREDMETRIC_DEBUG
if((anomaly_index > 0) && ((anomaly_index < 25) || (anomaly_index > 75)) && (gains > 0))
printf("%s[%s] [RSI: %u][gains: %lu][losses: %lu][delta: %" PRId64 "][last_update: %u]\n",
is_misbehaving(when) ? "<<<***>>> Anomaly " : "",
__FUNCTION__, (unsigned int)anomaly_index, (unsigned long)gains, (unsigned long)losses,
delta, (unsigned int)last_update);
#endif
}
static METRICTYPE ewma(METRICTYPE sample, METRICTYPE ewma, u_int8_t alpha_percent = 50) {
// if(alpha_percent > 100) alpha_percent = 100;
return((alpha_percent * sample + (100 - alpha_percent) * ewma) / 100);
}
public:
MonitoredMetric() {
reset();
}
virtual ~MonitoredMetric() {};
virtual void reset() {
value = 0, last_value = 0, gains = 0, losses = 0, last_update = 0, anomaly_index = 0;
}
inline METRICTYPE get() const { return(value); }
inline METRICTYPE getAnomalyIndex() const { return(anomaly_index); }
virtual void computeAnomalyIndex(time_t when) = 0;
inline bool is_misbehaving(time_t when, u_int8_t low_threshold = 25, u_int8_t high_threshold = 75) const {
return(last_update
&& ((anomaly_index > 0 && anomaly_index < low_threshold) || (anomaly_index > high_threshold)) ? true : false);
}
inline void setInitialValue(METRICTYPE v) {
reset();
last_value = value = v;
}
inline float inc(METRICTYPE v) {
value += v;
return((float)anomaly_index /* Last computed */);
}
const char * const print(char * const buf, ssize_t buf_size) {
if(buf && buf_size) {
snprintf(buf, buf_size, "%s[value: %lu][last_value: %lu][RSI: %lu][gains: %lu][losses: %lu][last_update: %u]\n",
this->is_misbehaving(0) ? "<<<***>>> Anomaly " : "",
(unsigned long)this->value, (unsigned long)this->last_value,
(unsigned long)this->anomaly_index, (unsigned long)this->gains, (unsigned long)this->losses,
(unsigned int)this->last_update);
}
return buf;
}
void const lua(lua_State *vm, const char *table_key) const {
#ifdef MONITOREDMETRIC_DEBUG
char buf[128];
printf("Lua anomaly [%s] %s", table_key, print(buf, sizeof(buf)));
#endif
lua_newtable(vm);
lua_push_uint64_table_entry(vm, "anomaly_index", anomaly_index);
lua_push_uint64_table_entry(vm, "value", value);
lua_push_uint64_table_entry(vm, "last_value", last_value);
lua_pushstring(vm, table_key);
lua_insert(vm, -2);
lua_settable(vm, -3);
}
};
#endif /* _MONITORED_METRIC_H_ */
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