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/**
* Copyright (C) 2023-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 Server Side 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.
*/
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kStorage
#include "mongo/db/storage/disk_space_monitor.h"
#include "mongo/db/client.h"
#include "mongo/db/commands/server_status_metric.h"
#include "mongo/db/storage/disk_space_util.h"
#include "mongo/db/storage/storage_parameters_gen.h"
#include "mongo/logv2/log.h"
namespace mongo {
CounterMetric monitorPasses("diskSpaceMonitor.passes");
CounterMetric tookAction("diskSpaceMonitor.tookAction");
namespace {
static const auto _decoration = ServiceContext::declareDecoration<DiskSpaceMonitor>();
} // namespace
void DiskSpaceMonitor::start(ServiceContext* svcCtx) {
auto storageEngine = svcCtx->getStorageEngine();
const bool filesNotAllInSameDirectory =
storageEngine->isUsingDirectoryPerDb() || storageEngine->isUsingDirectoryForIndexes();
if (filesNotAllInSameDirectory) {
LOGV2(7333400,
"The DiskSpaceMonitor will not run when the storage engine stores data files in "
"different directories");
return;
}
_decoration(svcCtx)._start(svcCtx);
}
void DiskSpaceMonitor::stop(ServiceContext* svcCtx) {
_decoration(svcCtx)._stop();
}
DiskSpaceMonitor* DiskSpaceMonitor::get(ServiceContext* svcCtx) {
return &_decoration(svcCtx);
}
void DiskSpaceMonitor::_start(ServiceContext* svcCtx) {
LOGV2(7333401, "Starting the DiskSpaceMonitor");
invariant(!_job, "DiskSpaceMonitor is already started");
_job = svcCtx->getPeriodicRunner()->makeJob(PeriodicRunner::PeriodicJob{
"DiskSpaceMonitor",
[this](Client* client) { _run(client); },
Seconds(1),
// TODO(SERVER-74657): Please revisit if this periodic job could be made killable.
false /*isKillableByStepdown*/});
_job.start();
}
void DiskSpaceMonitor::_stop() {
if (_job) {
LOGV2(7333402, "Shutting down the DiskSpaceMonitor");
_job.stop();
_job.detach();
}
}
void DiskSpaceMonitor::registerAction(std::unique_ptr<Action> action) {
stdx::lock_guard<Latch> lock(_mutex);
_actions.push_back(std::move(action));
}
void DiskSpaceMonitor::takeAction(OperationContext* opCtx, int64_t availableBytes) {
stdx::lock_guard<Latch> lock(_mutex);
for (auto& action : _actions) {
if (availableBytes <= action->getThresholdBytes()) {
action->act(opCtx, availableBytes);
tookAction.increment();
}
}
}
void DiskSpaceMonitor::_run(Client* client) try {
auto opCtx = client->makeOperationContext();
const auto availableBytes = getAvailableDiskSpaceBytesInDbPath();
LOGV2_DEBUG(7333405, 2, "Available disk space", "bytes"_attr = availableBytes);
takeAction(opCtx.get(), availableBytes);
monitorPasses.increment();
} catch (...) {
LOGV2(7333404, "Caught exception in DiskSpaceMonitor", "error"_attr = exceptionToStatus());
}
} // namespace mongo
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