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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/client/constants.h"
#include "mongo/client/dbclientcursor.h"
#include "mongo/db/repl/replication_coordinator.h"
#include "mongo/stdx/condition_variable.h"
#include "mongo/stdx/mutex.h"
#include "mongo/util/net/hostandport.h"
namespace mongo {
class OperationContext;
namespace repl {
class SyncSourceFeedback {
public:
/// Notifies the SyncSourceFeedbackThread to wake up and send an update upstream of slave
/// replication progress.
void forwardSlaveProgress();
/**
* Loops continuously until shutdown() is called, passing updates when they are present. If no
* update occurs within the _keepAliveInterval, progress is forwarded to let the upstream node
* know that this node, along with the alive nodes chaining through it, are still alive.
*/
void run();
/// Signals the run() method to terminate.
void shutdown();
private:
void _resetConnection();
/**
* Authenticates _connection using the server's cluster-membership credentials.
*
* Returns true on successful authentication.
*/
bool replAuthenticate();
/* Inform the sync target of our current position in the oplog, as well as the positions
* of all secondaries chained through us.
* "commandStyle" indicates whether or not the upstream node is pre-3.2.4 and needs the older
* style
* ReplSetUpdatePosition commands as a result.
*/
Status updateUpstream(OperationContext* txn,
ReplicationCoordinator::ReplSetUpdatePositionCommandStyle commandStyle);
bool hasConnection() {
return _connection.get();
}
/// Connect to sync target.
bool _connect(OperationContext* txn, const HostAndPort& host);
// the member we are currently syncing from
HostAndPort _syncTarget;
// our connection to our sync target
std::unique_ptr<DBClientConnection> _connection;
// protects cond, _shutdownSignaled, _keepAliveInterval, and _positionChanged.
stdx::mutex _mtx;
// used to alert our thread of changes which need to be passed up the chain
stdx::condition_variable _cond;
/// _keepAliveInterval indicates how frequently to forward progress in the absence of updates.
Milliseconds _keepAliveInterval = Milliseconds(100);
// used to indicate a position change which has not yet been pushed along
bool _positionChanged = false;
// Once this is set to true the _run method will terminate
bool _shutdownSignaled = false;
// Indicates version of the UpdatePosition command accepted by our syncSource.
ReplicationCoordinator::ReplSetUpdatePositionCommandStyle _commandStyle;
};
} // namespace repl
} // namespace mongo
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