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/**
* Copyright (C) 2016 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects
* for all of the code used other than as permitted herein. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you do not
* wish to do so, delete this exception statement from your version. If you
* delete this exception statement from all source files in the program,
* then also delete it in the license file.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/ftdc/ftdc_system_stats.h"
#include <string>
#include <vector>
#include "mongo/base/status.h"
#include "mongo/base/string_data.h"
#include "mongo/bson/bsonobjbuilder.h"
#include "mongo/db/ftdc/collector.h"
#include "mongo/db/ftdc/controller.h"
#include "mongo/stdx/memory.h"
#include "mongo/util/processinfo.h"
#include "mongo/util/procparser.h"
namespace mongo {
namespace {
static const std::vector<StringData> kCpuKeys{
"btime"_sd, "cpu"_sd, "ctxt"_sd, "processes"_sd, "procs_blocked"_sd, "procs_running"_sd};
static const std::vector<StringData> kMemKeys{
"MemTotal"_sd,
"MemFree"_sd,
"Cached"_sd,
"Dirty"_sd,
"Buffers"_sd,
"SwapTotal"_sd,
"SwapCached"_sd,
"SwapFree"_sd,
"Active"_sd,
"Inactive"_sd,
"Active(anon)"_sd,
"Inactive(anon)"_sd,
"Active(file)"_sd,
"Inactive(file)"_sd,
};
/**
* Collect metrics from the Linux /proc file system.
*/
class LinuxSystemMetricsCollector final : public SystemMetricsCollector {
public:
LinuxSystemMetricsCollector() : _disks(procparser::findPhysicalDisks("/sys/block"_sd)) {
for (const auto& disk : _disks) {
_disksStringData.emplace_back(disk);
}
}
void collect(OperationContext* opCtx, BSONObjBuilder& builder) override {
{
BSONObjBuilder subObjBuilder(builder.subobjStart("cpu"_sd));
// Include the number of cpus to simplify client calculations
ProcessInfo p;
subObjBuilder.append("num_cpus", p.getNumCores());
processStatusErrors(
procparser::parseProcStatFile("/proc/stat"_sd, kCpuKeys, &subObjBuilder),
&subObjBuilder);
subObjBuilder.doneFast();
}
{
BSONObjBuilder subObjBuilder(builder.subobjStart("memory"_sd));
processStatusErrors(
procparser::parseProcMemInfoFile("/proc/meminfo"_sd, kMemKeys, &subObjBuilder),
&subObjBuilder);
subObjBuilder.doneFast();
}
// Skip the disks section if we could not find any disks.
// This can happen when we do not have permission to /sys/block for instance.
if (!_disksStringData.empty()) {
BSONObjBuilder subObjBuilder(builder.subobjStart("disks"_sd));
processStatusErrors(procparser::parseProcDiskStatsFile(
"/proc/diskstats"_sd, _disksStringData, &subObjBuilder),
&subObjBuilder);
subObjBuilder.doneFast();
}
}
private:
// List of physical disks to collect stats from as string from findPhysicalDisks.
std::vector<std::string> _disks;
// List of physical disks to collect stats from as StringData to pass to parseProcDiskStatsFile.
std::vector<StringData> _disksStringData;
};
} // namespace
void installSystemMetricsCollector(FTDCController* controller) {
controller->addPeriodicCollector(stdx::make_unique<LinuxSystemMetricsCollector>());
}
} // namespace mongo
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