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/**
* Copyright (C) 2008-2015 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 <boost/shared_ptr.hpp>
#include "mongo/s/client/shard.h"
#include "mongo/s/shard_key_pattern.h"
#include "mongo/util/concurrency/mutex.h"
namespace mongo {
class ChunkManager;
class CollectionType;
class ConfigServer;
class DatabaseType;
class DBConfig;
typedef boost::shared_ptr<DBConfig> DBConfigPtr;
extern ConfigServer& configServer;
struct CollectionInfo {
CollectionInfo() {
_dirty = false;
_dropped = false;
}
CollectionInfo(const CollectionType& in);
~CollectionInfo();
bool isSharded() const {
return _cm.get();
}
boost::shared_ptr<ChunkManager> getCM() const {
return _cm;
}
void resetCM(ChunkManager * cm);
void shard(ChunkManager* cm);
void unshard();
bool isDirty() const { return _dirty; }
bool wasDropped() const { return _dropped; }
void save(const std::string& ns);
void useChunkManager(boost::shared_ptr<ChunkManager> manager);
bool unique() const { return _unique; }
BSONObj key() const { return _key; }
private:
BSONObj _key;
bool _unique;
boost::shared_ptr<ChunkManager> _cm;
bool _dirty;
bool _dropped;
};
/**
* top level configuration for a database
*/
class DBConfig {
public:
DBConfig(std::string name, const DatabaseType& dbt);
/**
* The name of the database which this entry caches.
*/
const std::string& name() const { return _name; }
/**
* Whether sharding is enabled for this database.
*/
bool isShardingEnabled() const { return _shardingEnabled; }
/**
* Reference to the primary shard for this database.
*/
const Shard& getPrimary() const { return _primary; }
void enableSharding( bool save = true );
/**
@return true if there was sharding info to remove
*/
bool removeSharding( const std::string& ns );
/**
* @return whether or not the 'ns' collection is partitioned
*/
bool isSharded( const std::string& ns );
// Atomically returns *either* the chunk manager *or* the primary shard for the collection,
// neither if the collection doesn't exist.
void getChunkManagerOrPrimary(const std::string& ns,
boost::shared_ptr<ChunkManager>& manager,
boost::shared_ptr<Shard>& primary);
boost::shared_ptr<ChunkManager> getChunkManager(const std::string& ns, bool reload = false, bool forceReload = false);
boost::shared_ptr<ChunkManager> getChunkManagerIfExists(const std::string& ns, bool reload = false, bool forceReload = false);
const Shard& getShard( const std::string& ns );
void setPrimary( const std::string& s );
bool load();
bool reload();
bool dropDatabase( std::string& errmsg );
void getAllShards(std::set<Shard>& shards);
void getAllShardedCollections(std::set<std::string>& namespaces);
protected:
typedef std::map<std::string, CollectionInfo> CollectionInfoMap;
/**
lockless
*/
bool _isSharded( const std::string& ns );
bool _dropShardedCollections( int& num, std::set<Shard>& allServers , std::string& errmsg );
bool _load();
bool _reload();
void _save( bool db = true, bool coll = true );
// Name of the database which this entry caches
const std::string _name;
// Primary shard name
Shard _primary;
// Whether sharding has been enabled for this database
bool _shardingEnabled;
// Set of collections and lock to protect access
mongo::mutex _lock;
CollectionInfoMap _collections;
// Ensures that only one thread at a time loads collection configuration data from
// the config server
mongo::mutex _hitConfigServerLock;
};
class ConfigServer {
public:
ConfigServer() = default;
bool ok( bool checkConsistency = false );
const Shard& getPrimary() const { return _primary; }
/**
call at startup, this will initiate connection to the grid db
*/
bool init( const ConnectionString& configCS );
/**
* Check hosts are unique. Returns true if all configHosts
* hostname:port entries are unique. Otherwise return false
* and fill errmsg with message containing the offending server.
*/
bool checkHostsAreUnique( const std::vector<std::string>& configHosts, std::string* errmsg );
void reloadSettings();
void replicaSetChange(const std::string& setName, const std::string& newConnectionString);
private:
std::string getHost( const std::string& name , bool withPort );
std::vector<std::string> _config;
Shard _primary;
};
} // namespace mongo
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