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/**
* Copyright (C) 2013 10gen 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/bson/bsonobj.h"
#include "mongo/db/write_concern_options.h"
#include "mongo/util/net/hostandport.h"
namespace mongo {
class OperationContext;
template <typename T>
class StatusWith;
namespace repl {
class OpTime;
}
/**
* Returns true if 'cmdObj' has a 'writeConcern' field.
*/
bool commandSpecifiesWriteConcern(const BSONObj& cmdObj);
/**
* Attempts to extract a writeConcern from cmdObj.
* Verifies that the writeConcern is of type Object (BSON type) and
* that the resulting writeConcern is valid for this particular host.
*/
StatusWith<WriteConcernOptions> extractWriteConcern(OperationContext* txn,
const BSONObj& cmdObj,
const std::string& dbName);
/**
* Verifies that a WriteConcern is valid for this particular host and database.
*/
Status validateWriteConcern(OperationContext* txn,
const WriteConcernOptions& writeConcern,
StringData dbName);
struct WriteConcernResult {
WriteConcernResult() {
reset();
}
void reset() {
syncMillis = -1;
fsyncFiles = -1;
wTimedOut = false;
wTime = -1;
err = "";
}
void appendTo(const WriteConcernOptions& writeConcern, BSONObjBuilder* result) const;
int syncMillis;
int fsyncFiles;
bool wTimedOut;
int wTime;
std::vector<HostAndPort> writtenTo;
std::string err; // this is the old err field, should deprecate
};
/**
* Blocks until the database is sure the specified user write concern has been fulfilled, or
* returns an error status if the write concern fails. Does no validation of the input write
* concern, it is an error to pass this function an invalid write concern for the host.
*
* Takes a user write concern as well as the replication opTime the write concern applies to -
* if this opTime.isNull() no replication-related write concern options will be enforced.
*
* Returns result of the write concern if successful.
* Returns NotMaster if the host steps down while waiting for replication
* Returns UnknownReplWriteConcern if the wMode specified was not enforceable
*/
Status waitForWriteConcern(OperationContext* txn,
const repl::OpTime& replOpTime,
const WriteConcernOptions& writeConcern,
WriteConcernResult* result);
} // namespace mongo
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