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/**
* Copyright (C) 2018-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_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kControl
#include "mongo/platform/basic.h"
#include "mongo/db/sessions_collection_config_server.h"
#include "mongo/client/query.h"
#include "mongo/db/commands.h"
#include "mongo/db/dbdirectclient.h"
#include "mongo/db/logical_session_id.h"
#include "mongo/db/operation_context.h"
#include "mongo/rpc/get_status_from_command_result.h"
#include "mongo/s/client/shard_registry.h"
#include "mongo/s/cluster_commands_helpers.h"
#include "mongo/s/grid.h"
#include "mongo/s/request_types/shard_collection_gen.h"
#include "mongo/util/log.h"
namespace mongo {
// Returns an error if the collection didn't exist and we couldn't
// shard it into existence, either.
Status SessionsCollectionConfigServer::_shardCollectionIfNeeded(OperationContext* opCtx) {
// First, check if the collection is already sharded.
auto res = _checkCacheForSessionsCollection(opCtx);
if (res.isOK()) {
return res;
}
// If we don't have any shards, we can't set up this collection yet.
if (Grid::get(opCtx)->shardRegistry()->getNumShards() == 0) {
return {ErrorCodes::ShardNotFound,
"Cannot create config.system.sessions until there are shards"};
}
// First, shard the sessions collection to create it.
ConfigsvrShardCollectionRequest shardCollection;
shardCollection.set_configsvrShardCollection(NamespaceString::kLogicalSessionsNamespace);
shardCollection.setKey(BSON("_id" << 1));
DBDirectClient client(opCtx);
BSONObj info;
if (!client.runCommand(
"admin", CommandHelpers::appendMajorityWriteConcern(shardCollection.toBSON()), info)) {
return getStatusFromCommandResult(info);
}
return Status::OK();
}
Status SessionsCollectionConfigServer::_generateIndexesIfNeeded(OperationContext* opCtx) {
try {
scatterGatherOnlyVersionIfUnsharded(opCtx,
NamespaceString::kLogicalSessionsNamespace,
SessionsCollection::generateCreateIndexesCmd(),
ReadPreferenceSetting::get(opCtx),
Shard::RetryPolicy::kNoRetry);
return Status::OK();
} catch (const DBException& ex) {
return ex.toStatus();
}
}
Status SessionsCollectionConfigServer::setupSessionsCollection(OperationContext* opCtx) {
// If the sharding state is not yet initialized, fail.
if (!Grid::get(opCtx)->isShardingInitialized()) {
return {ErrorCodes::ShardingStateNotInitialized, "sharding state is not yet initialized"};
}
stdx::lock_guard<stdx::mutex> lk(_mutex);
{
// Only try to set up this collection until we have done so successfully once.
// Note: if there is a config server election, it's possible that two different
// primaries could both run the createIndexes scatter-gather query; this is ok.
if (_collectionSetUp) {
return Status::OK();
}
auto res = _shardCollectionIfNeeded(opCtx);
if (!res.isOK()) {
log() << "Failed to create config.system.sessions: " << res.reason()
<< ", will try again at the next refresh interval";
return res;
}
res = _generateIndexesIfNeeded(opCtx);
if (!res.isOK()) {
log() << "Failed to generate TTL index for config.system.sessions on all shards, "
<< "will try again on the next refresh interval";
}
_collectionSetUp = true;
return res;
}
}
Status SessionsCollectionConfigServer::checkSessionsCollectionExists(OperationContext* opCtx) {
return _checkCacheForSessionsCollection(opCtx);
}
} // namespace mongo
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