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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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kSharding
#include "mongo/platform/basic.h"
#include "mongo/s/cluster_identity_loader.h"
#include "mongo/base/status_with.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/service_context.h"
#include "mongo/s/catalog/sharding_catalog_client.h"
#include "mongo/s/catalog/type_config_version.h"
#include "mongo/s/grid.h"
namespace mongo {
namespace {
const auto getClusterIdentity = ServiceContext::declareDecoration<ClusterIdentityLoader>();
} // namespace
ClusterIdentityLoader* ClusterIdentityLoader::get(ServiceContext* serviceContext) {
return &getClusterIdentity(serviceContext);
}
ClusterIdentityLoader* ClusterIdentityLoader::get(OperationContext* operationContext) {
return ClusterIdentityLoader::get(operationContext->getServiceContext());
}
OID ClusterIdentityLoader::getClusterId() {
stdx::unique_lock<stdx::mutex> lk(_mutex);
invariant(_initializationState == InitializationState::kInitialized && _lastLoadResult.isOK());
return _lastLoadResult.getValue();
}
Status ClusterIdentityLoader::loadClusterId(OperationContext* opCtx,
const repl::ReadConcernLevel& readConcernLevel) {
stdx::unique_lock<stdx::mutex> lk(_mutex);
if (_initializationState == InitializationState::kInitialized) {
invariant(_lastLoadResult.isOK());
return Status::OK();
}
if (_initializationState == InitializationState::kLoading) {
while (_initializationState == InitializationState::kLoading) {
_inReloadCV.wait(lk);
}
return _lastLoadResult.getStatus();
}
invariant(_initializationState == InitializationState::kUninitialized);
_initializationState = InitializationState::kLoading;
lk.unlock();
auto loadStatus = _fetchClusterIdFromConfig(opCtx, readConcernLevel);
lk.lock();
invariant(_initializationState == InitializationState::kLoading);
_lastLoadResult = std::move(loadStatus);
if (_lastLoadResult.isOK()) {
_initializationState = InitializationState::kInitialized;
} else {
_initializationState = InitializationState::kUninitialized;
}
_inReloadCV.notify_all();
return _lastLoadResult.getStatus();
}
StatusWith<OID> ClusterIdentityLoader::_fetchClusterIdFromConfig(
OperationContext* opCtx, const repl::ReadConcernLevel& readConcernLevel) {
auto catalogClient = Grid::get(opCtx)->catalogClient(opCtx);
auto loadResult = catalogClient->getConfigVersion(opCtx, readConcernLevel);
if (!loadResult.isOK()) {
return Status(loadResult.getStatus().code(),
str::stream() << "Error loading clusterID"
<< causedBy(loadResult.getStatus().reason()));
}
return loadResult.getValue().getClusterId();
}
void ClusterIdentityLoader::discardCachedClusterId() {
stdx::lock_guard<stdx::mutex> lk(_mutex);
if (_initializationState == InitializationState::kUninitialized) {
return;
}
invariant(_initializationState == InitializationState::kInitialized);
_lastLoadResult = {
Status{ErrorCodes::InternalError, "cluster ID never re-loaded after rollback"}};
_initializationState = InitializationState::kUninitialized;
}
} // namespace mongo
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