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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/db/repl/oplogreader.h"
#include "mongo/client/constants.h"
#include "mongo/client/dbclientcursor.h"
#include "mongo/util/background.h"
namespace mongo {
class Member;
class SyncSourceFeedback : public BackgroundJob {
public:
SyncSourceFeedback() : BackgroundJob(false /*don't selfdelete*/),
_syncTarget(NULL),
_positionChanged(false),
_handshakeNeeded(false) {}
~SyncSourceFeedback() {}
/// Adds an entry to _members for a secondary that has connected to us.
void associateMember(const BSONObj& id, Member* member);
/// Ensures local.me is populated and populates it if not.
void ensureMe();
/// Passes handshake up the replication chain, upon receiving a handshake.
void forwardSlaveHandshake();
void updateSelfInMap(const OpTime& ot) {
updateMap(_me["_id"].OID(), ot);
}
void resetConnection() {
LOG(1) << "resetting connection in sync source feedback";
_connection.reset();
}
/// Updates the _slaveMap to be forwarded to the sync target.
void updateMap(const mongo::OID& rid, const OpTime& ot);
std::string name() const { return "SyncSourceFeedbackThread"; }
/// Loops forever, passing updates when they are present.
void run();
private:
/**
* Authenticates _connection using the server's cluster-membership credentials.
*
* Returns true on successful authentication.
*/
bool replAuthenticate();
/* Sends initialization information to our sync target, also determines whether or not they
* support the updater command.
*/
bool replHandshake();
/* Inform the sync target of our current position in the oplog, as well as the positions
* of all secondaries chained through us.
*/
bool updateUpstream();
bool hasConnection() {
return _connection.get();
}
/// Connect to sync target.
bool _connect(const std::string& hostName);
// stores our OID to be passed along in commands
BSONObj _me;
// the member we are currently syncing from
const Member* _syncTarget;
// our connection to our sync target
boost::scoped_ptr<DBClientConnection> _connection;
// protects cond and maps and the indicator bools
boost::mutex _mtx;
// contains the most recent optime of each member syncing to us
map<mongo::OID, OpTime> _slaveMap;
typedef map<mongo::OID, Member*> OIDMemberMap;
// contains a pointer to each member, which we can look up by oid
OIDMemberMap _members;
// used to alert our thread of changes which need to be passed up the chain
boost::condition _cond;
// used to indicate a position change which has not yet been pushed along
bool _positionChanged;
// used to indicate a connection change which has not yet been shook on
bool _handshakeNeeded;
};
}
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