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117 lines
4 KiB
C++
117 lines
4 KiB
C++
/*
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*
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* (C) 2013-20 - ntop.org
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*
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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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* (at your option) 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, write to the Free Software Foundation,
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* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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*/
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#ifndef _MONITORED_METRIC_H_
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#define _MONITORED_METRIC_H_
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template <typename METRICTYPE> class MonitoredMetric {
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protected:
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METRICTYPE value, last_value, gains, losses;
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time_t last_update;
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METRICTYPE anomaly_index;
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inline void updateAnomalyIndex(time_t when, int64_t delta) {
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if(delta > 0)
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gains = ewma((METRICTYPE)delta, gains),
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losses = ewma(0, losses);
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else
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gains = ewma(0, gains),
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losses = ewma((METRICTYPE)-delta, losses);
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if(delta /* No variation -> no anomaly */
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&& last_update /* Wait at least two points */
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&& (gains || losses) /* Meaningless to calculate an anomaly when both are at zero */)
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anomaly_index = (METRICTYPE)(100 - (100 / (float)(1 + ((float)(gains) / (float)(losses) + 1))));
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else
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anomaly_index = 0;
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#ifdef MONITOREDMETRIC_DEBUG
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if((anomaly_index > 0) && ((anomaly_index < 25) || (anomaly_index > 75)) && (gains > 0))
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printf("%s[%s] [RSI: %u][gains: %lu][losses: %lu][delta: %" PRId64 "][last_update: %u]\n",
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is_misbehaving(when) ? "<<<***>>> Anomaly " : "",
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__FUNCTION__, (unsigned int)anomaly_index, (unsigned long)gains, (unsigned long)losses,
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delta, (unsigned int)last_update);
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#endif
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}
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static METRICTYPE ewma(METRICTYPE sample, METRICTYPE ewma, u_int8_t alpha_percent = 50) {
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// if(alpha_percent > 100) alpha_percent = 100;
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return((alpha_percent * sample + (100 - alpha_percent) * ewma) / 100);
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}
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public:
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MonitoredMetric() {
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reset();
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}
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virtual ~MonitoredMetric() {};
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virtual void reset() {
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value = 0, last_value = 0, gains = 0, losses = 0, last_update = 0, anomaly_index = 0;
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}
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inline METRICTYPE get() const { return(value); }
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inline METRICTYPE getAnomalyIndex() const { return(anomaly_index); }
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virtual void computeAnomalyIndex(time_t when) = 0;
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inline bool is_misbehaving(time_t when, u_int8_t low_threshold = 25, u_int8_t high_threshold = 75) const {
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return(last_update
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&& ((anomaly_index > 0 && anomaly_index < low_threshold) || (anomaly_index > high_threshold)) ? true : false);
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}
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inline void setInitialValue(METRICTYPE v) {
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reset();
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last_value = value = v;
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}
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inline float inc(METRICTYPE v) {
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value += v;
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return((float)anomaly_index /* Last computed */);
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}
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const char * const print(char * const buf, ssize_t buf_size) {
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if(buf && buf_size) {
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snprintf(buf, buf_size, "%s[value: %lu][last_value: %lu][RSI: %lu][gains: %lu][losses: %lu][last_update: %u]\n",
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this->is_misbehaving(0) ? "<<<***>>> Anomaly " : "",
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(unsigned long)this->value, (unsigned long)this->last_value,
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(unsigned long)this->anomaly_index, (unsigned long)this->gains, (unsigned long)this->losses,
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(unsigned int)this->last_update);
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}
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return buf;
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}
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void const lua(lua_State *vm, const char *table_key) const {
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#ifdef MONITOREDMETRIC_DEBUG
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char buf[128];
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printf("Lua anomaly [%s] %s", table_key, print(buf, sizeof(buf)));
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#endif
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lua_newtable(vm);
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lua_push_uint64_table_entry(vm, "anomaly_index", anomaly_index);
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lua_push_uint64_table_entry(vm, "value", value);
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lua_push_uint64_table_entry(vm, "last_value", last_value);
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lua_pushstring(vm, table_key);
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lua_insert(vm, -2);
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lua_settable(vm, -3);
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}
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};
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#endif /* _MONITORED_METRIC_H_ */
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