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/** @file oplogreader.h */
/**
* Copyright (C) 2012 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/client/dbclient_connection.h"
#include "mongo/client/dbclient_cursor.h"
#include "mongo/util/net/hostandport.h"
namespace mongo {
namespace repl {
/**
* Authenticates conn using the server's cluster-membership credentials.
*
* Returns true on successful authentication.
*/
bool replAuthenticate(DBClientBase* conn);
/* started abstracting out the querying of the primary/master's oplog
still fairly awkward but a start.
*/
class OplogReader {
private:
std::shared_ptr<DBClientConnection> _conn;
std::shared_ptr<DBClientCursor> cursor;
int _tailingQueryOptions;
// If _conn was actively connected, _host represents the current HostAndPort of the
// connection.
HostAndPort _host;
public:
OplogReader();
~OplogReader() {}
void resetCursor() {
cursor.reset();
}
void resetConnection() {
cursor.reset();
_conn.reset();
_host = HostAndPort();
}
DBClientConnection* conn() {
return _conn.get();
}
BSONObj findOne(const char* ns, const Query& q) {
return conn()->findOne(ns, q, 0, QueryOption_SlaveOk);
}
BSONObj findOneByUUID(const std::string& db, UUID uuid, const BSONObj& filter) {
// Note that the findOneByUUID() function of DBClient passes SlaveOK to the client.
BSONObj foundDoc;
std::tie(foundDoc, std::ignore) = conn()->findOneByUUID(db, uuid, filter);
return foundDoc;
}
/* SO_TIMEOUT (send/recv time out) for our DBClientConnections */
static const Seconds kSocketTimeout;
/* ok to call if already connected */
bool connect(const HostAndPort& host);
void tailCheck();
bool haveCursor() {
return cursor.get() != 0;
}
void tailingQuery(const char* ns, const BSONObj& query);
bool more() {
uassert(15910, "Doesn't have cursor for reading oplog", cursor.get());
return cursor->more();
}
bool moreInCurrentBatch() {
uassert(15911, "Doesn't have cursor for reading oplog", cursor.get());
return cursor->moreInCurrentBatch();
}
BSONObj nextSafe() {
return cursor->nextSafe();
}
};
} // namespace repl
} // namespace mongo
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