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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 <string>
#include <vector>
#include "mongo/base/status.h"
#include "mongo/bson/bsonobj.h"
#include "mongo/s/commands/strategy.h"
#include "mongo/stdx/memory.h"
namespace mongo {
class AScopedConnection;
class DBClientBase;
class DBClientCursor;
class OperationContext;
/**
* DEPRECATED - do not use in any new code. All new code must use the TaskExecutor interface
* instead.
*/
class Future {
public:
class CommandResult {
public:
std::string getServer() const {
return _server;
}
bool isDone() const {
return _done;
}
bool ok() const {
verify(_done);
return _ok;
}
BSONObj result() const {
verify(_done);
return _res;
}
/**
blocks until command is done
returns ok()
*/
bool join(OperationContext* opCtx, int maxRetries = 1);
private:
CommandResult(const std::string& server,
const std::string& db,
const BSONObj& cmd,
int options,
DBClientBase* conn,
bool useShardedConn);
void init();
std::string _server;
std::string _db;
int _options;
BSONObj _cmd;
DBClientBase* _conn;
std::unique_ptr<AScopedConnection> _connHolder; // used if not provided a connection
bool _useShardConn;
std::unique_ptr<DBClientCursor> _cursor;
BSONObj _res;
bool _ok;
bool _done;
friend class Future;
};
/**
* @param server server name
* @param db db name
* @param cmd cmd to exec
* @param conn optional connection to use. will use standard pooled if non-specified
* @param useShardConn use ShardConnection
*/
static std::shared_ptr<CommandResult> spawnCommand(const std::string& server,
const std::string& db,
const BSONObj& cmd,
int options,
DBClientBase* conn = 0,
bool useShardConn = false);
};
/**
* Utility function to compute a single error code from a vector of command results.
*
* @return If there is an error code common to all of the error results, returns that error
* code; otherwise, returns 0.
*/
int getUniqueCodeFromCommandResults(const std::vector<Strategy::CommandResult>& results);
/**
* Utility function to return an empty result set from a command.
*/
bool appendEmptyResultSet(BSONObjBuilder& result, Status status, const std::string& ns);
/**
* Returns the set of collections for the specified database, which have been marked as sharded.
* Goes directly to the config server's metadata, without checking the local cache so it should not
* be used in frequently called code paths.
*
* Throws exception on errors.
*/
std::vector<NamespaceString> getAllShardedCollectionsForDb(OperationContext* opCtx,
StringData dbName);
} // namespace mongo
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