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linux_cpu_measurement_node.cpp
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linux_cpu_measurement_node.cpp
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// Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
//
// 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 <cmath>
#include <chrono>
#include <fstream>
#include <sstream>
#include <string>
#include "../../src/system_metrics_collector/linux_cpu_measurement_node.hpp"
#include "../../src/system_metrics_collector/periodic_measurement_node.hpp"
#include "../../src/system_metrics_collector/utilities.hpp"
#include "rclcpp/rclcpp.hpp"
#include "rcutils/logging_macros.h"
using metrics_statistics_msgs::msg::MetricsMessage;
namespace
{
constexpr const char MEASUREMENT_TYPE[] = "system_cpu_percent_used";
constexpr const char PROC_STAT_FILE[] = "/proc/stat";
} // namespace
namespace system_metrics_collector
{
LinuxCpuMeasurementNode::LinuxCpuMeasurementNode(
const std::string & name,
const std::chrono::milliseconds measurement_period,
const std::string & topic,
const std::chrono::milliseconds publish_period)
: PeriodicMeasurementNode(name, measurement_period, topic, publish_period),
last_measurement_()
{}
bool LinuxCpuMeasurementNode::setupStart()
{
last_measurement_ = ProcCpuData();
return PeriodicMeasurementNode::setupStart();
}
double LinuxCpuMeasurementNode::periodicMeasurement()
{
const system_metrics_collector::ProcCpuData current_measurement = makeSingleMeasurement();
const auto cpu_percentage = computeCpuActivePercentage(
last_measurement_,
current_measurement);
last_measurement_ = current_measurement;
return cpu_percentage;
}
system_metrics_collector::ProcCpuData LinuxCpuMeasurementNode::makeSingleMeasurement()
{
std::ifstream stat_file(PROC_STAT_FILE);
if (!stat_file.good()) {
RCLCPP_ERROR(this->get_logger(), "unable to open file %s", PROC_STAT_FILE);
return system_metrics_collector::ProcCpuData();
}
std::string line;
std::getline(stat_file, line);
if (!stat_file.good()) {
RCLCPP_ERROR(this->get_logger(), "unable to get cpu line from file");
return system_metrics_collector::ProcCpuData();
} else {
return processStatCpuLine(line);
}
}
std::string LinuxCpuMeasurementNode::getMetricName() const
{
return MEASUREMENT_TYPE;
}
} // namespace system_metrics_collector