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/**
* Copyright (C) 2017 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.
*/
#pragma once
#include <string>
#include "mongo/db/keys_collection_cache_reader.h"
#include "mongo/util/duration.h"
namespace mongo {
class ShardingCatalogClient;
/**
* Keeps a local cache of the keys with the ability to refresh. The refresh method also makes sure
* that there will be valid keys available to sign the current cluster time and there will be
* another key ready after the current key expires.
*
* Assumptions and limitations:
* - assumes that user does not manually update the keys collection.
* - assumes that current process is the config primary.
*/
class KeysCollectionCacheReaderAndUpdater : public KeysCollectionCacheReader {
public:
KeysCollectionCacheReaderAndUpdater(std::string purpose,
ShardingCatalogClient* client,
Seconds keyValidForInterval);
~KeysCollectionCacheReaderAndUpdater() = default;
/**
* Check if there are new documents expiresAt > latestKeyDoc.expiresAt.
*/
StatusWith<KeysCollectionDocument> refresh(OperationContext* opCtx) override;
StatusWith<KeysCollectionDocument> getKey(const LogicalTime& forThisTime) override;
StatusWith<KeysCollectionDocument> getKeyById(long long keyId,
const LogicalTime& forThisTime) override;
private:
const std::string _purpose;
const Seconds _keyValidForInterval;
ShardingCatalogClient* const _catalogClient;
};
} // namespace mongo
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