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new(userspace/engine): create stats_manager inside falco engine

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This is a porting of what we had inside the Lua codebase. This now handles the single responsibility
of gathering stats about rule-event matching, and of formatting them to print them to the user.

Signed-off-by: Jason Dellaluce <jasondellaluce@gmail.com>
This commit is contained in:
Jason Dellaluce
2022-04-06 13:39:08 +00:00
committed by poiana
parent 9e93b7cd52
commit d483b897e7
2 changed files with 130 additions and 0 deletions
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79
userspace/engine/stats_manager.cpp Normal file
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/*
Copyright (C) 2022 The Falco Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
#include "stats_manager.h"
#include "falco_common.h"
using namespace std;
void stats_manager::clear()
{
m_total = 0;
m_by_rule_id.clear();
m_by_priority.clear();
}
void stats_manager::format_stats(indexed_vector<falco_rule>& rules, string& out)
{
string fmt;
string name;
out = "Events detected: " + to_string(m_total) + "\n";
out += "Rule counts by severity:\n";
for (size_t i = 0; i < m_by_priority.size(); i++)
{
if (m_by_priority[i] > 0)
{
falco_common::format_priority((falco_common::priority_type) i, fmt);
transform(fmt.begin(), fmt.end(), fmt.begin(), ::toupper);
out += " " + fmt;
out += ": " + to_string(m_by_priority[i]) + "\n";
}
}
out += "Triggered rules by rule name:\n";
for (size_t i = 0; i < m_by_rule_id.size(); i++)
{
if (m_by_rule_id[i] > 0)
{
out += " " + rules.at(i)->name;
out += ": " + to_string(m_by_rule_id[i]) + "\n";
}
}
}
void stats_manager::on_event(
indexed_vector<falco_rule>& rules,
uint32_t rule_id)
{
auto *rule = rules.at(rule_id);
if (!rule)
{
throw falco_exception(
"on_event(): event with invalid rule_id: " + rule_id);
}
if (m_by_rule_id.size() <= rule_id)
{
m_by_rule_id.resize(rule_id + 1);
m_by_rule_id[rule_id] = 0;
}
if (m_by_priority.size() <= (size_t) rule->priority)
{
m_by_priority.resize((size_t) rule->priority + 1);
m_by_priority[(size_t) rule->priority] = 0;
}
m_total++;
m_by_rule_id[rule_id]++;
m_by_priority[(size_t) rule->priority]++;
}