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// cloner.h - copy a database (export/import basically)
/**
* Copyright (C) 2011 10gen 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.
*/
#pragma once
#include <string>
#include <vector>
#include "mongo/base/disallow_copying.h"
#include "mongo/client/dbclientinterface.h"
#include "mongo/s/catalog/catalog_manager.h"
namespace mongo {
struct CloneOptions;
class DBClientBase;
class NamespaceString;
class OperationContext;
class Cloner {
MONGO_DISALLOW_COPYING(Cloner);
public:
Cloner();
void setConnection(DBClientBase* c) {
_conn.reset(c);
}
/**
* Copies an entire database from the specified host.
* clonedColls: when not-null, the function will return with this populated with a list of
* the collections that were cloned. This is for the user-facing clone command.
* collectionsToClone: When opts.createCollections is false, this list reflects the collections
* that are cloned. When opts.createCollections is true, this parameter is
* ignored and the collection list is fetched from the remote via _conn.
*/
Status copyDb(OperationContext* txn,
const std::string& toDBName,
const std::string& masterHost,
const CloneOptions& opts,
std::set<std::string>* clonedColls,
std::vector<BSONObj> collectionsToClone = std::vector<BSONObj>());
bool copyCollection(OperationContext* txn,
const std::string& ns,
const BSONObj& query,
std::string& errmsg,
bool copyIndexes);
// Filters a database's collection list and removes collections that should not be cloned.
// CloneOptions should be populated with a fromDB and a list of collections to ignore, which
// will be filtered out.
StatusWith<std::vector<BSONObj>> filterCollectionsForClone(
const CloneOptions& opts, const std::list<BSONObj>& initialCollections);
// Executes 'createCollection' for each collection specified in 'collections', in 'dbName'.
Status createCollectionsForDb(OperationContext* txn,
const std::vector<BSONObj>& collections,
const std::string& dbName);
private:
void copy(OperationContext* txn,
const std::string& toDBName,
const NamespaceString& from_ns,
const BSONObj& from_opts,
const NamespaceString& to_ns,
bool masterSameProcess,
const CloneOptions& opts,
Query q);
void copyIndexes(OperationContext* txn,
const std::string& toDBName,
const NamespaceString& from_ns,
const BSONObj& from_opts,
const NamespaceString& to_ns,
bool masterSameProcess,
bool slaveOk);
struct Fun;
std::unique_ptr<DBClientBase> _conn;
};
/**
* slaveOk - if true it is ok if the source of the data is !ismaster.
* useReplAuth - use the credentials we normally use as a replication slave for the cloning
* snapshot - use snapshot mode for copying collections. note this should not be used
* when it isn't required, as it will be slower. for example,
* repairDatabase need not use it.
* checkForCatalogChange - Internal option set for clone commands initiated by a mongos that are
* holding a distributed lock (such as movePrimary). Indicates that we need to
* be periodically checking to see if the catalog manager has swapped and fail
* if it has so that we don't block the mongos that initiated the command.
* createCollections - When 'true', will fetch a list of collections from the remote and create
* them. When 'false', assumes collections have already been created ahead of time.
*/
struct CloneOptions {
std::string fromDB;
std::set<std::string> collsToIgnore;
bool slaveOk = false;
bool useReplAuth = false;
bool snapshot = true;
bool syncData = true;
bool syncIndexes = true;
bool checkForCatalogChange = false;
bool createCollections = true;
};
} // namespace mongo
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