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author | Blake Oler <blake.oler@mongodb.com> | 2018-01-30 18:00:27 -0500 |
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committer | Blake Oler <blake.oler@mongodb.com> | 2018-01-31 12:17:18 -0500 |
commit | 0fb3ff2ee1fc5305b9523cdeaaae9c7279f1c117 (patch) | |
tree | 688b5a332893fe28e2a8486cd36de2e912180a6d /src/mongo/db/keys_collection_cache.cpp | |
parent | 3c34eda8d8a38b982a1659b919e9f4b5971ba512 (diff) | |
download | mongo-0fb3ff2ee1fc5305b9523cdeaaae9c7279f1c117.tar.gz |
SERVER-28887 Cleanup KeysCollectionCacheReader/AndUpdater
Diffstat (limited to 'src/mongo/db/keys_collection_cache.cpp')
-rw-r--r-- | src/mongo/db/keys_collection_cache.cpp | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/src/mongo/db/keys_collection_cache.cpp b/src/mongo/db/keys_collection_cache.cpp new file mode 100644 index 00000000000..0491d69397f --- /dev/null +++ b/src/mongo/db/keys_collection_cache.cpp @@ -0,0 +1,111 @@ +/** + * 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; + + { + stdx::lock_guard<stdx::mutex> lk(_cacheMutex); + auto iter = _cache.crbegin(); + if (iter != _cache.crend()) { + newerThanThis = iter->second.getExpiresAt(); + } + } + + auto refreshStatus = _client->getNewKeys(opCtx, _purpose, newerThanThis); + + 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> 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()) { + _cache.clear(); + } +} + +} // namespace mongo |