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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 "mongo/client/connection_string.h"
#include "mongo/db/repl/optime.h"
#include "mongo/platform/atomic_word.h"
#include "mongo/s/catalog/catalog_manager.h"
#include "mongo/stdx/mutex.h"
namespace mongo {
class NamespaceString;
struct ReadPreferenceSetting;
class VersionType;
/**
* Implements the catalog manager for talking to replica set config servers.
*/
class CatalogManagerReplicaSet final : public CatalogManager {
public:
CatalogManagerReplicaSet();
virtual ~CatalogManagerReplicaSet();
/**
* Initializes the catalog manager.
* Can only be called once for the lifetime of the catalog manager.
* TODO(spencer): Take pointer to ShardRegistry rather than getting it from the global
* "grid" object.
*/
Status init(const ConnectionString& configCS, std::unique_ptr<DistLockManager> distLockManager);
Status startup() override;
ConnectionString connectionString() const override;
void shutDown() override;
Status shardCollection(OperationContext* txn,
const std::string& ns,
const ShardKeyPattern& fieldsAndOrder,
bool unique,
const std::vector<BSONObj>& initPoints,
const std::set<ShardId>& initShardsIds) override;
StatusWith<ShardDrainingStatus> removeShard(OperationContext* txn,
const std::string& name) override;
StatusWith<DatabaseType> getDatabase(const std::string& dbName) override;
StatusWith<CollectionType> getCollection(const std::string& collNs) override;
Status getCollections(const std::string* dbName,
std::vector<CollectionType>* collections) override;
Status getDatabasesForShard(const std::string& shardName,
std::vector<std::string>* dbs) override;
Status getChunks(const BSONObj& query,
const BSONObj& sort,
boost::optional<int> limit,
std::vector<ChunkType>* chunks) override;
Status getTagsForCollection(const std::string& collectionNs,
std::vector<TagsType>* tags) override;
StatusWith<std::string> getTagForChunk(const std::string& collectionNs,
const ChunkType& chunk) override;
Status getAllShards(std::vector<ShardType>* shards) override;
bool runUserManagementWriteCommand(const std::string& commandName,
const std::string& dbname,
const BSONObj& cmdObj,
BSONObjBuilder* result) override;
bool runReadCommand(const std::string& dbname,
const BSONObj& cmdObj,
BSONObjBuilder* result) override;
bool runUserManagementReadCommand(const std::string& dbname,
const BSONObj& cmdObj,
BSONObjBuilder* result) override;
Status applyChunkOpsDeprecated(const BSONArray& updateOps,
const BSONArray& preCondition) override;
void logAction(const ActionLogType& actionLog) override;
void logChange(const std::string& clientAddress,
const std::string& what,
const std::string& ns,
const BSONObj& detail) override;
StatusWith<SettingsType> getGlobalSettings(const std::string& key) override;
void writeConfigServerDirect(const BatchedCommandRequest& request,
BatchedCommandResponse* response) override;
DistLockManager* getDistLockManager() const override;
Status checkAndUpgrade(bool checkOnly) override;
private:
Status _checkDbDoesNotExist(const std::string& dbName, DatabaseType* db) override;
StatusWith<std::string> _generateNewShardName() override;
bool _runReadCommand(const std::string& dbname,
const BSONObj& cmdObj,
const ReadPreferenceSetting& settings,
BSONObjBuilder* result);
/**
* Helper method for running a count command against a given target server with appropriate
* error handling.
*/
StatusWith<long long> _runCountCommandOnConfig(const HostAndPort& target,
const NamespaceString& ns,
BSONObj query);
StatusWith<BSONObj> _runCommandOnConfig(const HostAndPort& target,
const std::string& dbName,
BSONObj cmdObj);
StatusWith<BSONObj> _runCommandOnConfigWithNotMasterRetries(const std::string& dbName,
BSONObj cmdObj);
StatusWith<std::vector<BSONObj>> _exhaustiveFindOnConfig(const HostAndPort& host,
const NamespaceString& nss,
const BSONObj& query,
const BSONObj& sort,
boost::optional<long long> limit);
/**
* Appends a read committed read concern to the request object.
*/
void _appendReadConcern(BSONObjBuilder* builder);
/**
* Returns the current cluster schema/protocol version.
*/
StatusWith<VersionType> _getConfigVersion();
/**
* Returns the highest last known config server opTime.
*/
repl::OpTime _getConfigOpTime();
/**
* Updates the last known config server opTime if the given opTime is newer.
*/
void _updateLastSeenConfigOpTime(const repl::OpTime& optime);
//
// All member variables are labeled with one of the following codes indicating the
// synchronization rules for accessing them.
//
// (F) Self synchronizing.
// (M) Must hold _mutex for access.
// (R) Read only, can only be written during initialization.
//
stdx::mutex _mutex;
// Config server connection string
ConnectionString _configServerConnectionString; // (R)
// Distribted lock manager singleton.
std::unique_ptr<DistLockManager> _distLockManager; // (R)
// Whether the logAction call should attempt to create the actionlog collection
AtomicInt32 _actionLogCollectionCreated; // (F)
// Whether the logChange call should attempt to create the changelog collection
AtomicInt32 _changeLogCollectionCreated; // (F)
// True if shutDown() has been called. False, otherwise.
bool _inShutdown = false; // (M)
// Last known highest opTime from the config server.
repl::OpTime _configOpTime; // (M)
};
} // namespace mongo
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