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/**
* Copyright (C) 2019-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.
*/
#include "mongo/platform/basic.h"
#include "mongo/watchdog/watchdog_mongod.h"
#include <boost/filesystem.hpp>
#include <memory>
#include "mongo/base/init.h"
#include "mongo/config.h"
#include "mongo/db/client.h"
#include "mongo/db/commands/server_status.h"
#include "mongo/db/server_options.h"
#include "mongo/db/service_context.h"
#include "mongo/db/storage/storage_options.h"
#include "mongo/logv2/log.h"
#include "mongo/util/clock_source.h"
#include "mongo/util/clock_source_mock.h"
#include "mongo/util/tick_source_mock.h"
#include "mongo/watchdog/watchdog.h"
#include "mongo/watchdog/watchdog_mongod_gen.h"
#include "mongo/watchdog/watchdog_register.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kDefault
namespace mongo {
namespace {
// Run the watchdog checks at a fixed interval regardless of user choice for monitoring period.
constexpr Seconds watchdogCheckPeriod = Seconds{10};
const auto getWatchdogMonitor =
ServiceContext::declareDecoration<std::unique_ptr<WatchdogMonitor>>();
// A boolean variable to track whether the watchdog was enabled at startup.
// Defaults to true because set parameters are handled before we start the watchdog if needed.
bool watchdogEnabled{true};
WatchdogMonitor* getGlobalWatchdogMonitor() {
if (!hasGlobalServiceContext()) {
return nullptr;
}
return getWatchdogMonitor(getGlobalServiceContext()).get();
}
} // namespace
Status validateWatchdogPeriodSeconds(const int& value) {
if (value < 60 && value != -1) {
return {ErrorCodes::BadValue, "watchdogPeriodSeconds must be greater than or equal to 60s"};
}
// If the watchdog was not enabled at startup, disallow changes the period.
if (!watchdogEnabled) {
return {ErrorCodes::BadValue,
"watchdogPeriodSeconds cannot be changed at runtime if it was not set at startup"};
}
return Status::OK();
}
Status onUpdateWatchdogPeriodSeconds(const int& value) {
auto monitor = getGlobalWatchdogMonitor();
if (monitor) {
monitor->setPeriod(Seconds(value));
}
return Status::OK();
}
/**
* Server status section for the Watchdog.
*
* Sample format:
*
* watchdog: {
* generation: int,
* }
*/
class WatchdogServerStatusSection : public ServerStatusSection {
public:
WatchdogServerStatusSection() : ServerStatusSection("watchdog") {}
bool includeByDefault() const {
// Only include this by default if the watchdog is on
return watchdogEnabled;
}
BSONObj generateSection(OperationContext* opCtx, const BSONElement& configElement) const {
if (!watchdogEnabled) {
return BSONObj();
}
BSONObjBuilder result;
WatchdogMonitor* watchdog = getWatchdogMonitor(opCtx->getServiceContext()).get();
invariant(watchdog);
result.append("checkGeneration", watchdog->getCheckGeneration());
result.append("monitorGeneration", watchdog->getMonitorGeneration());
result.append("monitorPeriod", gWatchdogPeriodSeconds.load());
return result.obj();
}
} watchdogServerStatusSection;
void startWatchdog(ServiceContext* service) {
// Check three paths if set
// 1. storage directory - optional for inmemory?
// 2. log path - optional
// 3. audit path - optional
Seconds period{gWatchdogPeriodSeconds.load()};
if (period < Seconds::zero()) {
// Skip starting the watchdog if the user has not asked for it.
watchdogEnabled = false;
return;
}
watchdogEnabled = true;
std::vector<std::unique_ptr<WatchdogCheck>> checks;
auto dataCheck =
std::make_unique<DirectoryCheck>(boost::filesystem::path(storageGlobalParams.dbpath));
checks.push_back(std::move(dataCheck));
// Add a check for the journal if it is not disabled
if (storageGlobalParams.dur) {
auto journalDirectory = boost::filesystem::path(storageGlobalParams.dbpath);
journalDirectory /= "journal";
if (boost::filesystem::exists(journalDirectory)) {
auto journalCheck = std::make_unique<DirectoryCheck>(journalDirectory);
checks.push_back(std::move(journalCheck));
} else {
LOGV2_WARNING(23835,
"Watchdog is skipping check for journal directory since it does not "
"exist: '{journalDirectory_generic_string}'",
"journalDirectory_generic_string"_attr =
journalDirectory.generic_string());
}
}
// If the user specified a log path, also monitor that directory.
// This may be redudant with the dbpath check but there is not easy way to confirm they are
// duplicate.
if (!serverGlobalParams.logpath.empty()) {
boost::filesystem::path logFile(serverGlobalParams.logpath);
auto logPath = logFile.parent_path();
auto logCheck = std::make_unique<DirectoryCheck>(logPath);
checks.push_back(std::move(logCheck));
}
// If the user specified an audit path, also monitor that directory.
// This may be redudant with the dbpath check but there is not easy way to confirm they are
// duplicate.
for (auto&& path : getWatchdogPaths()) {
auto auditCheck = std::make_unique<DirectoryCheck>(path);
checks.push_back(std::move(auditCheck));
}
auto monitor = std::make_unique<WatchdogMonitor>(
std::move(checks), watchdogCheckPeriod, period, watchdogTerminate);
// Install the new WatchdogMonitor
auto& staticMonitor = getWatchdogMonitor(service);
staticMonitor = std::move(monitor);
staticMonitor->start();
}
} // namespace mongo
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