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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.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/keys_collection_cache_reader.h"
#include "mongo/s/catalog/sharding_catalog_client.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
KeysCollectionCacheReader::KeysCollectionCacheReader(std::string purpose,
ShardingCatalogClient* client)
: _purpose(std::move(purpose)), _catalogClient(client) {}
StatusWith<KeysCollectionDocument> KeysCollectionCacheReader::refresh(OperationContext* opCtx) {
LogicalTime newerThanThis;
{
stdx::lock_guard<stdx::mutex> lk(_cacheMutex);
auto iter = _cache.crbegin();
if (iter != _cache.crend()) {
newerThanThis = iter->second.getExpiresAt();
}
}
auto refreshStatus = _catalogClient->getNewKeys(
opCtx, _purpose, newerThanThis, repl::ReadConcernLevel::kMajorityReadConcern);
if (!refreshStatus.isOK()) {
return refreshStatus.getStatus();
}
auto& newKeys = refreshStatus.getValue();
stdx::lock_guard<stdx::mutex> lk(_cacheMutex);
for (auto&& key : newKeys) {
_cache.emplace(std::make_pair(key.getExpiresAt(), std::move(key)));
}
if (_cache.empty()) {
return {ErrorCodes::KeyNotFound, "No keys found after refresh"};
}
return _cache.crbegin()->second;
}
StatusWith<KeysCollectionDocument> KeysCollectionCacheReader::getKey(
const LogicalTime& forThisTime) {
stdx::lock_guard<stdx::mutex> lk(_cacheMutex);
auto iter = _cache.upper_bound(forThisTime);
if (iter == _cache.cend()) {
return {ErrorCodes::KeyNotFound,
str::stream() << "No key found that is valid for " << forThisTime.toString()};
}
return iter->second;
}
} // namespace mongo
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