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/**
* Copyright (C) 2015 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.
*/
#pragma once
#include <list>
#include <string>
#include <vector>
#include "mongo/base/disallow_copying.h"
#include "mongo/base/status.h"
#include "mongo/bson/bsonobj.h"
#include "mongo/client/fetcher.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/repl/collection_cloner.h"
#include "mongo/db/repl/base_cloner.h"
#include "mongo/db/repl/replication_executor.h"
#include "mongo/stdx/condition_variable.h"
#include "mongo/stdx/mutex.h"
#include "mongo/util/net/hostandport.h"
namespace mongo {
namespace repl {
class DatabaseCloner : public BaseCloner {
MONGO_DISALLOW_COPYING(DatabaseCloner);
public:
/**
* Predicate used on the collection info objects returned by listCollections.
* Each collection info is represented by a document in the following format:
* {
* name: <collection name>,
* options: <collection options>
* }
*
* Returns true if the collection described by the info object should be cloned.
* Returns false if the collection should be ignored.
*/
using ListCollectionsPredicateFn = stdx::function<bool(const BSONObj&)>;
/**
* Callback function to report progress of collection cloning. Arguments are:
* - status from the collection cloner's 'onCompletion' callback.
* - source namespace of the collection cloner that completed (or failed).
*
* Called exactly once for every collection cloner started by the the database cloner.
*/
using CollectionCallbackFn = stdx::function<void(const Status&, const NamespaceString&)>;
/**
* Type of function to start a collection cloner.
*/
using StartCollectionClonerFn = stdx::function<Status(CollectionCloner&)>;
/**
* Creates DatabaseCloner task in inactive state. Use start() to activate cloner.
*
* The cloner calls 'onCompletion' when the database cloning has completed or failed.
*
* 'onCompletion' will be called exactly once.
*
* Takes ownership of the passed StorageInterface object.
*/
DatabaseCloner(ReplicationExecutor* executor,
const HostAndPort& source,
const std::string& dbname,
const BSONObj& listCollectionsFilter,
const ListCollectionsPredicateFn& listCollectionsPredicate,
CollectionCloner::StorageInterface* storageInterface,
const CollectionCallbackFn& collectionWork,
const CallbackFn& onCompletion);
virtual ~DatabaseCloner();
/**
* Returns collection info objects read from listCollections result.
* This will return an empty vector until we have processed the last
* batch of results from listCollections.
*/
const std::vector<BSONObj>& getCollectionInfos() const;
std::string getDiagnosticString() const override;
bool isActive() const override;
Status start() override;
void cancel() override;
void wait() override;
//
// Testing only functions below.
//
/**
* Overrides how executor schedules database work.
*
* For testing only.
*/
void setScheduleDbWorkFn(const CollectionCloner::ScheduleDbWorkFn& scheduleDbWorkFn);
/**
* Overrides how executor starts a collection cloner.
*
* For testing only
*/
void setStartCollectionClonerFn(const StartCollectionClonerFn& startCollectionCloner);
private:
/**
* Read collection names and options from listCollections result.
*/
void _listCollectionsCallback(const StatusWith<Fetcher::QueryResponse>& fetchResult,
Fetcher::NextAction* nextAction,
BSONObjBuilder* getMoreBob);
/**
* Forwards collection cloner result to client.
* Starts a new cloner on a different collection.
*/
void _collectionClonerCallback(const Status& status, const NamespaceString& nss);
/**
* Reports completion status.
* Sets cloner to inactive.
*/
void _finishCallback(const Status& status);
// Not owned by us.
ReplicationExecutor* _executor;
HostAndPort _source;
std::string _dbname;
BSONObj _listCollectionsFilter;
ListCollectionsPredicateFn _listCollectionsPredicate;
CollectionCloner::StorageInterface* _storageInterface;
// Invoked once for every successfully started collection cloner.
CollectionCallbackFn _collectionWork;
// Invoked once when cloning completes or fails.
CallbackFn _onCompletion;
// Protects member data of this database cloner.
mutable stdx::mutex _mutex;
mutable stdx::condition_variable _condition;
// _active is true when database cloner is started.
bool _active;
// Fetcher instance for running listCollections command.
Fetcher _listCollectionsFetcher;
// Collection info objects returned from listCollections.
// Format of each document:
// {
// name: <collection name>,
// options: <collection options>
// }
// Holds all collection infos from listCollections.
std::vector<BSONObj> _collectionInfos;
std::vector<NamespaceString> _collectionNamespaces;
std::list<CollectionCloner> _collectionCloners;
std::list<CollectionCloner>::iterator _currentCollectionClonerIter;
// Function for scheduling database work using the executor.
CollectionCloner::ScheduleDbWorkFn _scheduleDbWorkFn;
StartCollectionClonerFn _startCollectionCloner;
};
} // namespace repl
} // namespace mongo
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