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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.h"
#include "mongo/db/keys_collection_client.h"
#include "mongo/db/keys_collection_document.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
KeysCollectionCache::KeysCollectionCache(std::string purpose, KeysCollectionClient* client)
: _purpose(std::move(purpose)), _client(client) {}
StatusWith<KeysCollectionDocument> KeysCollectionCache::refresh(OperationContext* opCtx) {
LogicalTime newerThanThis;
decltype(_cache)::size_type originalSize = 0;
{
stdx::lock_guard<stdx::mutex> lk(_cacheMutex);
auto iter = _cache.crbegin();
if (iter != _cache.crend()) {
newerThanThis = iter->second.getExpiresAt();
}
originalSize = _cache.size();
}
auto refreshStatus = _client->getNewKeys(opCtx, _purpose, newerThanThis);
if (!refreshStatus.isOK()) {
return refreshStatus.getStatus();
}
auto& newKeys = refreshStatus.getValue();
stdx::lock_guard<stdx::mutex> lk(_cacheMutex);
if (originalSize > _cache.size()) {
// _cache cleared while we getting the new keys, just return the newest key without
// touching the _cache so the next refresh will populate it properly.
// Note: newKeys are sorted.
if (!newKeys.empty()) {
return std::move(newKeys.back());
}
}
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> KeysCollectionCache::getKeyById(long long keyId,
const LogicalTime& forThisTime) {
stdx::lock_guard<stdx::mutex> lk(_cacheMutex);
for (auto iter = _cache.lower_bound(forThisTime); iter != _cache.cend(); ++iter) {
if (iter->second.getKeyId() == keyId) {
return iter->second;
}
}
return {ErrorCodes::KeyNotFound,
str::stream() << "Cache Reader No keys found for " << _purpose
<< " that is valid for time: "
<< forThisTime.toString()
<< " with id: "
<< keyId};
}
StatusWith<KeysCollectionDocument> KeysCollectionCache::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;
}
void KeysCollectionCache::resetCache() {
// keys that read with non majority readConcern level can be rolled back.
if (!_client->supportsMajorityReads()) {
stdx::lock_guard<stdx::mutex> lk(_cacheMutex);
_cache.clear();
}
}
} // namespace mongo
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