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linux_memory_measurement_node.cpp
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linux_memory_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 <chrono>
#include <fstream>
#include <sstream>
#include <streambuf>
#include <string>
#include "../../src/system_metrics_collector/linux_memory_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 kMeasurementType[] = "system_memory_percent_used";
constexpr const char kProcStatFile[] = "/proc/meminfo";
} // namespace
namespace system_metrics_collector
{
LinuxMemoryMeasurementNode::LinuxMemoryMeasurementNode(
const std::string & name,
const rclcpp::NodeOptions & options)
: PeriodicMeasurementNode(name, options)
{
}
double LinuxMemoryMeasurementNode::PeriodicMeasurement()
{
std::ifstream stat_file{kProcStatFile};
if (!stat_file.good()) {
return std::nan("");
}
auto read_string = ReadFileToString(kProcStatFile);
return ProcessMemInfoLines(read_string);
}
std::string LinuxMemoryMeasurementNode::GetMetricName() const
{
return kMeasurementType;
}
} // namespace system_metrics_collector