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// cloner.h - copy a database (export/import basically)
/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 Server Side 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/dbclient_base.h"
#include "mongo/db/catalog/collection_options.h"
namespace mongo {
struct CloneOptions;
class DBClientBase;
class NamespaceString;
class OperationContext;
class Cloner {
MONGO_DISALLOW_COPYING(Cloner);
public:
Cloner();
void setConnection(std::unique_ptr<DBClientBase> c) {
_conn = std::move(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.
* 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* opCtx,
const std::string& toDBName,
const std::string& masterHost,
const CloneOptions& opts,
std::set<std::string>* clonedColls,
std::vector<BSONObj> collectionsToClone = std::vector<BSONObj>());
/**
* Copies a collection. The optionsParser indicates how to parse the collection options. If
* 'parseForCommand' is provided, then the UUID is ignored and a new UUID is generated. If
* 'parseForStorage' is provided, then the UUID will be preserved and parsed out of the
* options.
*/
bool copyCollection(OperationContext* opCtx,
const std::string& ns,
const BSONObj& query,
std::string& errmsg,
bool copyIndexes,
CollectionOptions::ParseKind optionsParser);
// 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);
struct CreateCollectionParams {
std::string collectionName;
BSONObj collectionInfo;
BSONObj idIndexSpec;
bool shardedColl = false;
};
// Executes 'createCollection' for each collection described in 'createCollectionParams', in
// 'dbName'.
Status createCollectionsForDb(OperationContext* opCtx,
const std::vector<CreateCollectionParams>& createCollectionParams,
const std::string& dbName,
const CloneOptions& opts);
/*
* Returns the _id index spec from 'indexSpecs', or an empty BSONObj if none is found.
*/
static BSONObj getIdIndexSpec(const std::list<BSONObj>& indexSpecs);
private:
void copy(OperationContext* opCtx,
const std::string& toDBName,
const NamespaceString& from_ns,
const BSONObj& from_opts,
const BSONObj& from_id_index,
const NamespaceString& to_ns,
const CloneOptions& opts,
Query q);
void copyIndexes(OperationContext* opCtx,
const std::string& toDBName,
const NamespaceString& from_ns,
const BSONObj& from_opts,
const std::list<BSONObj>& from_indexes,
const NamespaceString& to_ns);
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
* 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> shardedColls;
bool slaveOk = false;
bool useReplAuth = false;
bool syncData = true;
bool syncIndexes = true;
bool createCollections = true;
};
} // namespace mongo
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