/**
* 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 .
*
* 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.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/repl/oplog_interface_remote.h"
#include "mongo/client/dbclientinterface.h"
#include "mongo/db/jsobj.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
namespace repl {
namespace {
class OplogIteratorRemote : public OplogInterface::Iterator {
public:
OplogIteratorRemote(std::unique_ptr cursor);
StatusWith next() override;
private:
std::unique_ptr _cursor;
};
OplogIteratorRemote::OplogIteratorRemote(std::unique_ptr cursor)
: _cursor(std::move(cursor)) {}
StatusWith OplogIteratorRemote::next() {
if (!_cursor.get()) {
return StatusWith(ErrorCodes::NamespaceNotFound, "no cursor for remote oplog");
}
if (!_cursor->more()) {
return StatusWith(ErrorCodes::CollectionIsEmpty,
"no more operations in remote oplog");
}
return StatusWith(std::make_pair(_cursor->nextSafe(), RecordId()));
}
} // namespace
OplogInterfaceRemote::OplogInterfaceRemote(GetConnectionFn getConnection,
const std::string& collectionName)
: _getConnection(getConnection), _collectionName(collectionName) {}
std::string OplogInterfaceRemote::toString() const {
return _getConnection()->toString();
}
std::unique_ptr OplogInterfaceRemote::makeIterator() const {
const Query query = Query().sort(BSON("$natural" << -1));
const BSONObj fields = BSON("ts" << 1 << "h" << 1);
return std::unique_ptr(new OplogIteratorRemote(
_getConnection()->query(_collectionName, query, 0, 0, &fields, 0, 0)));
}
} // namespace repl
} // namespace mongo