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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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kStorage
#include "mongo/platform/basic.h"
#include <algorithm>
#include "namespace_uuid_cache.h"
#include "mongo/db/catalog/database.h"
#include "mongo/db/server_parameters.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/log.h"
namespace mongo {
// TODO(geert): Enable checks by default
MONGO_EXPORT_STARTUP_SERVER_PARAMETER(debugCollectionUUIDs, bool, false);
const OperationContext::Decoration<NamespaceUUIDCache> NamespaceUUIDCache::get =
OperationContext::declareDecoration<NamespaceUUIDCache>();
void NamespaceUUIDCache::ensureNamespaceInCache(const NamespaceString& nss, CollectionUUID uuid) {
StringData ns(nss.ns());
CollectionUUIDMap::const_iterator it = _cache.find(ns);
if (it == _cache.end()) {
// Add ns, uuid pair to the cache if it does not yet exist.
invariant(_cache.try_emplace(ns, uuid).second == true);
LOG(3) << "NamespaceUUIDCache: registered namespace " << nss.ns() << " with UUID " << uuid;
} else if (it->second != uuid) {
// If ns exists in the cache, make sure it does not correspond to another uuid.
auto msg = "Namespace " + ns + " now resolves to UUID " + uuid.toString() +
" instead of UUID " + it->second.toString();
LOG(1) << msg;
uassert(40418, "Cannot continue operation: " + msg, !debugCollectionUUIDs);
}
}
void NamespaceUUIDCache::evictNamespace(const NamespaceString& nss) {
size_t evicted = _cache.erase(nss.ns());
if (evicted) {
LOG(2) << "NamespaceUUIDCache: evicted namespace " << nss.ns();
}
invariant(evicted <= 1);
}
void NamespaceUUIDCache::evictNamespacesInDatabase(StringData dbname) {
for (auto&& it = _cache.begin(); it != _cache.end();) {
auto entry = it++;
if (entry->first.empty() || nsToDatabaseSubstring(entry->first) == dbname)
_cache.erase(entry);
}
}
} // namespace mongo
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