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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 Server Side 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/dbclient_base.h"
#include "mongo/client/dbclient_cursor.h"
#include "mongo/db/jsobj.h"
#include "mongo/db/repl/read_concern_args.h"
#include "mongo/util/str.h"
namespace mongo {
namespace repl {
namespace {
class OplogIteratorRemote : public OplogInterface::Iterator {
public:
OplogIteratorRemote(std::unique_ptr<DBClientCursor> cursor);
StatusWith<Value> next() override;
private:
std::unique_ptr<DBClientCursor> _cursor;
};
OplogIteratorRemote::OplogIteratorRemote(std::unique_ptr<DBClientCursor> cursor)
: _cursor(std::move(cursor)) {}
StatusWith<OplogInterface::Iterator::Value> OplogIteratorRemote::next() {
if (!_cursor.get()) {
return StatusWith<Value>(ErrorCodes::NamespaceNotFound, "no cursor for remote oplog");
}
if (!_cursor->more()) {
return StatusWith<Value>(ErrorCodes::CollectionIsEmpty,
"no more operations in remote oplog");
}
return StatusWith<Value>(std::make_pair(_cursor->nextSafe(), RecordId()));
}
} // namespace
OplogInterfaceRemote::OplogInterfaceRemote(HostAndPort hostAndPort,
GetConnectionFn getConnection,
const std::string& collectionName,
int batchSize)
: _hostAndPort(hostAndPort),
_getConnection(getConnection),
_collectionName(collectionName),
_batchSize(batchSize) {}
std::string OplogInterfaceRemote::toString() const {
return _getConnection()->toString();
}
std::unique_ptr<OplogInterface::Iterator> OplogInterfaceRemote::makeIterator() const {
FindCommandRequest findRequest{NamespaceString{_collectionName}};
findRequest.setProjection(BSON("ts" << 1 << "t" << 1LL));
findRequest.setSort(BSON("$natural" << -1));
findRequest.setBatchSize(_batchSize);
findRequest.setReadConcern(ReadConcernArgs::kLocal);
return std::unique_ptr<OplogInterface::Iterator>(
new OplogIteratorRemote(_getConnection()->find(std::move(findRequest))));
}
std::unique_ptr<TransactionHistoryIteratorBase>
OplogInterfaceRemote::makeTransactionHistoryIterator(const OpTime&, bool permitYield) const {
// Should never ask for remote transaction history.
MONGO_UNREACHABLE;
}
HostAndPort OplogInterfaceRemote::hostAndPort() const {
return _hostAndPort;
}
} // namespace repl
} // namespace mongo
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