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/**
* Copyright (C) 2016 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 <memory>
#include "mongo/db/storage/kv/kv_database_catalog_entry.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/storage/kv/kv_catalog_feature_tracker.h"
#include "mongo/db/storage/kv/kv_collection_catalog_entry.h"
#include "mongo/db/storage/kv/kv_engine.h"
#include "mongo/db/storage/kv/kv_storage_engine.h"
#include "mongo/db/storage/recovery_unit.h"
namespace mongo {
using std::string;
using std::vector;
class KVDatabaseCatalogEntryBase::AddCollectionChange : public RecoveryUnit::Change {
public:
AddCollectionChange(OperationContext* opCtx,
KVDatabaseCatalogEntryBase* dce,
StringData collection,
StringData ident,
bool dropOnRollback)
: _opCtx(opCtx),
_dce(dce),
_collection(collection.toString()),
_ident(ident.toString()),
_dropOnRollback(dropOnRollback) {}
virtual void commit() {}
virtual void rollback() {
if (_dropOnRollback) {
// Intentionally ignoring failure
_dce->_engine->getEngine()->dropIdent(_opCtx, _ident);
}
const CollectionMap::iterator it = _dce->_collections.find(_collection);
if (it != _dce->_collections.end()) {
delete it->second;
_dce->_collections.erase(it);
}
}
OperationContext* const _opCtx;
KVDatabaseCatalogEntryBase* const _dce;
const std::string _collection;
const std::string _ident;
const bool _dropOnRollback;
};
class KVDatabaseCatalogEntryBase::RemoveCollectionChange : public RecoveryUnit::Change {
public:
RemoveCollectionChange(OperationContext* opCtx,
KVDatabaseCatalogEntryBase* dce,
StringData collection,
StringData ident,
KVCollectionCatalogEntry* entry,
bool dropOnCommit)
: _opCtx(opCtx),
_dce(dce),
_collection(collection.toString()),
_ident(ident.toString()),
_entry(entry),
_dropOnCommit(dropOnCommit) {}
virtual void commit() {
delete _entry;
// Intentionally ignoring failure here. Since we've removed the metadata pointing to the
// collection, we should never see it again anyway.
if (_dropOnCommit)
_dce->_engine->getEngine()->dropIdent(_opCtx, _ident);
}
virtual void rollback() {
_dce->_collections[_collection] = _entry;
}
OperationContext* const _opCtx;
KVDatabaseCatalogEntryBase* const _dce;
const std::string _collection;
const std::string _ident;
KVCollectionCatalogEntry* const _entry;
const bool _dropOnCommit;
};
KVDatabaseCatalogEntryBase::KVDatabaseCatalogEntryBase(StringData db, KVStorageEngine* engine)
: DatabaseCatalogEntry(db), _engine(engine) {}
KVDatabaseCatalogEntryBase::~KVDatabaseCatalogEntryBase() {
for (CollectionMap::const_iterator it = _collections.begin(); it != _collections.end(); ++it) {
delete it->second;
}
_collections.clear();
}
bool KVDatabaseCatalogEntryBase::exists() const {
return !isEmpty();
}
bool KVDatabaseCatalogEntryBase::isEmpty() const {
return _collections.empty();
}
bool KVDatabaseCatalogEntryBase::hasUserData() const {
return !isEmpty();
}
int64_t KVDatabaseCatalogEntryBase::sizeOnDisk(OperationContext* opCtx) const {
int64_t size = 0;
for (CollectionMap::const_iterator it = _collections.begin(); it != _collections.end(); ++it) {
const KVCollectionCatalogEntry* coll = it->second;
if (!coll)
continue;
size += coll->getRecordStore()->storageSize(opCtx);
vector<string> indexNames;
coll->getAllIndexes(opCtx, &indexNames);
for (size_t i = 0; i < indexNames.size(); i++) {
string ident =
_engine->getCatalog()->getIndexIdent(opCtx, coll->ns().ns(), indexNames[i]);
size += _engine->getEngine()->getIdentSize(opCtx, ident);
}
}
return size;
}
void KVDatabaseCatalogEntryBase::appendExtraStats(OperationContext* opCtx,
BSONObjBuilder* out,
double scale) const {}
Status KVDatabaseCatalogEntryBase::currentFilesCompatible(OperationContext* opCtx) const {
// Delegate to the FeatureTracker as to whether the data files are compatible or not.
return _engine->getCatalog()->getFeatureTracker()->isCompatibleWithCurrentCode(opCtx);
}
void KVDatabaseCatalogEntryBase::getCollectionNamespaces(std::list<std::string>* out) const {
for (CollectionMap::const_iterator it = _collections.begin(); it != _collections.end(); ++it) {
out->push_back(it->first);
}
}
CollectionCatalogEntry* KVDatabaseCatalogEntryBase::getCollectionCatalogEntry(StringData ns) const {
CollectionMap::const_iterator it = _collections.find(ns.toString());
if (it == _collections.end()) {
return NULL;
}
return it->second;
}
RecordStore* KVDatabaseCatalogEntryBase::getRecordStore(StringData ns) const {
CollectionMap::const_iterator it = _collections.find(ns.toString());
if (it == _collections.end()) {
return NULL;
}
return it->second->getRecordStore();
}
Status KVDatabaseCatalogEntryBase::createCollection(OperationContext* txn,
StringData ns,
const CollectionOptions& options,
bool allocateDefaultSpace) {
invariant(txn->lockState()->isDbLockedForMode(name(), MODE_X));
if (ns.empty()) {
return Status(ErrorCodes::BadValue, "Collection namespace cannot be empty");
}
if (_collections.count(ns.toString())) {
invariant(_collections[ns.toString()]);
return Status(ErrorCodes::NamespaceExists, "collection already exists");
}
// need to create it
Status status = _engine->getCatalog()->newCollection(txn, ns, options);
if (!status.isOK())
return status;
string ident = _engine->getCatalog()->getCollectionIdent(ns);
status = _engine->getEngine()->createRecordStore(txn, ns, ident, options);
if (!status.isOK())
return status;
// Mark collation feature as in use if the collection has a non-simple default collation.
if (!options.collation.isEmpty()) {
const auto feature = KVCatalog::FeatureTracker::NonRepairableFeature::kCollation;
if (_engine->getCatalog()->getFeatureTracker()->isNonRepairableFeatureInUse(txn, feature)) {
_engine->getCatalog()->getFeatureTracker()->markNonRepairableFeatureAsInUse(txn,
feature);
}
}
txn->recoveryUnit()->registerChange(new AddCollectionChange(txn, this, ns, ident, true));
auto rs = _engine->getEngine()->getRecordStore(txn, ns, ident, options);
invariant(rs);
_collections[ns.toString()] = new KVCollectionCatalogEntry(
_engine->getEngine(), _engine->getCatalog(), ns, ident, std::move(rs));
return Status::OK();
}
void KVDatabaseCatalogEntryBase::initCollection(OperationContext* opCtx,
const std::string& ns,
bool forRepair) {
invariant(!_collections.count(ns));
const std::string ident = _engine->getCatalog()->getCollectionIdent(ns);
std::unique_ptr<RecordStore> rs;
if (forRepair) {
// Using a NULL rs since we don't want to open this record store before it has been
// repaired. This also ensures that if we try to use it, it will blow up.
rs = nullptr;
} else {
BSONCollectionCatalogEntry::MetaData md = _engine->getCatalog()->getMetaData(opCtx, ns);
rs = _engine->getEngine()->getRecordStore(opCtx, ns, ident, md.options);
invariant(rs);
}
// No change registration since this is only for committed collections
_collections[ns] = new KVCollectionCatalogEntry(
_engine->getEngine(), _engine->getCatalog(), ns, ident, std::move(rs));
}
void KVDatabaseCatalogEntryBase::reinitCollectionAfterRepair(OperationContext* opCtx,
const std::string& ns) {
// Get rid of the old entry.
CollectionMap::iterator it = _collections.find(ns);
invariant(it != _collections.end());
delete it->second;
_collections.erase(it);
// Now reopen fully initialized.
initCollection(opCtx, ns, false);
}
Status KVDatabaseCatalogEntryBase::renameCollection(OperationContext* txn,
StringData fromNS,
StringData toNS,
bool stayTemp) {
invariant(txn->lockState()->isDbLockedForMode(name(), MODE_X));
RecordStore* originalRS = NULL;
CollectionMap::const_iterator it = _collections.find(fromNS.toString());
if (it == _collections.end()) {
return Status(ErrorCodes::NamespaceNotFound, "rename cannot find collection");
}
originalRS = it->second->getRecordStore();
it = _collections.find(toNS.toString());
if (it != _collections.end()) {
return Status(ErrorCodes::NamespaceExists, "for rename to already exists");
}
const std::string identFrom = _engine->getCatalog()->getCollectionIdent(fromNS);
Status status = _engine->getEngine()->okToRename(txn, fromNS, toNS, identFrom, originalRS);
if (!status.isOK())
return status;
status = _engine->getCatalog()->renameCollection(txn, fromNS, toNS, stayTemp);
if (!status.isOK())
return status;
const std::string identTo = _engine->getCatalog()->getCollectionIdent(toNS);
invariant(identFrom == identTo);
BSONCollectionCatalogEntry::MetaData md = _engine->getCatalog()->getMetaData(txn, toNS);
const CollectionMap::iterator itFrom = _collections.find(fromNS.toString());
invariant(itFrom != _collections.end());
txn->recoveryUnit()->registerChange(
new RemoveCollectionChange(txn, this, fromNS, identFrom, itFrom->second, false));
_collections.erase(itFrom);
txn->recoveryUnit()->registerChange(new AddCollectionChange(txn, this, toNS, identTo, false));
auto rs = _engine->getEngine()->getRecordStore(txn, toNS, identTo, md.options);
_collections[toNS.toString()] = new KVCollectionCatalogEntry(
_engine->getEngine(), _engine->getCatalog(), toNS, identTo, std::move(rs));
return Status::OK();
}
Status KVDatabaseCatalogEntryBase::dropCollection(OperationContext* opCtx, StringData ns) {
invariant(opCtx->lockState()->isDbLockedForMode(name(), MODE_X));
CollectionMap::const_iterator it = _collections.find(ns.toString());
if (it == _collections.end()) {
return Status(ErrorCodes::NamespaceNotFound, "cannnot find collection to drop");
}
KVCollectionCatalogEntry* const entry = it->second;
invariant(entry->getTotalIndexCount(opCtx) == entry->getCompletedIndexCount(opCtx));
{
std::vector<std::string> indexNames;
entry->getAllIndexes(opCtx, &indexNames);
for (size_t i = 0; i < indexNames.size(); i++) {
entry->removeIndex(opCtx, indexNames[i]);
}
}
invariant(entry->getTotalIndexCount(opCtx) == 0);
const std::string ident = _engine->getCatalog()->getCollectionIdent(ns);
Status status = _engine->getCatalog()->dropCollection(opCtx, ns);
if (!status.isOK()) {
return status;
}
// This will lazily delete the KVCollectionCatalogEntry and notify the storageEngine to
// drop the collection only on WUOW::commit().
opCtx->recoveryUnit()->registerChange(
new RemoveCollectionChange(opCtx, this, ns, ident, it->second, true));
_collections.erase(ns.toString());
return Status::OK();
}
} // namespace mongo
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