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// @file rsmember.h
/*
* Copyright (C) 2010 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.
*/
/** replica set member */
#pragma once
#include "mongo/util/concurrency/value.h"
namespace mongo {
/*
RS_STARTUP serving still starting up, or still trying to initiate the set
RS_PRIMARY this server thinks it is primary
RS_SECONDARY this server thinks it is a secondary (slave mode)
RS_RECOVERING recovering/resyncing; after recovery usually auto-transitions to secondary
RS_FATAL something bad has occurred and server is not completely offline with regard to the replica set. fatal error.
RS_STARTUP2 loaded config, still determining who is primary
*/
struct MemberState {
enum MS {
RS_STARTUP = 0,
RS_PRIMARY = 1,
RS_SECONDARY = 2,
RS_RECOVERING = 3,
RS_FATAL = 4,
RS_STARTUP2 = 5,
RS_UNKNOWN = 6, /* remote node not yet reached */
RS_ARBITER = 7,
RS_DOWN = 8, /* node not reachable for a report */
RS_ROLLBACK = 9,
RS_SHUNNED = 10, /* node shunned from replica set */
} s;
MemberState(MS ms = RS_UNKNOWN) : s(ms) { }
explicit MemberState(int ms) : s((MS) ms) { }
bool startup() const { return s == RS_STARTUP; }
bool primary() const { return s == RS_PRIMARY; }
bool secondary() const { return s == RS_SECONDARY; }
bool recovering() const { return s == RS_RECOVERING; }
bool startup2() const { return s == RS_STARTUP2; }
bool fatal() const { return s == RS_FATAL; }
bool rollback() const { return s == RS_ROLLBACK; }
bool readable() const { return s == RS_PRIMARY || s == RS_SECONDARY; }
bool shunned() const { return s == RS_SHUNNED; }
string toString() const;
bool operator==(const MemberState& r) const { return s == r.s; }
bool operator!=(const MemberState& r) const { return s != r.s; }
};
/* this is supposed to be just basic information on a member,
and copy constructable. */
class HeartbeatInfo {
unsigned _id;
public:
HeartbeatInfo() : _id(0xffffffff), hbstate(MemberState::RS_UNKNOWN), health(-1.0),
downSince(0), lastHeartbeatRecv(0), skew(INT_MIN), authIssue(false), ping(0) { }
HeartbeatInfo(unsigned id);
unsigned id() const { return _id; }
MemberState hbstate;
double health;
time_t upSince;
long long downSince;
// This is the last time we got a response from a heartbeat request to a given member.
time_t lastHeartbeat;
// This is the last time we got a heartbeat request from a given member.
time_t lastHeartbeatRecv;
DiagStr lastHeartbeatMsg;
DiagStr syncingTo;
OpTime opTime;
int skew;
bool authIssue;
unsigned int ping; // milliseconds
static unsigned int numPings;
bool up() const { return health > 0; }
/** health is set to -1 on startup. that means we haven't even checked yet. 0 means we checked and it failed. */
bool maybeUp() const { return health != 0; }
long long timeDown() const; // ms
/* true if changed in a way of interest to the repl set manager. */
bool changed(const HeartbeatInfo& old) const;
/**
* Updates this with the info received from the command result we got from
* the last replSetHeartbeat.
*/
void updateFromLastPoll(const HeartbeatInfo& newInfo);
};
inline HeartbeatInfo::HeartbeatInfo(unsigned id) :
_id(id),
lastHeartbeatRecv(0),
authIssue(false),
ping(0) {
hbstate = MemberState::RS_UNKNOWN;
health = -1.0;
downSince = 0;
lastHeartbeat = upSince = 0;
skew = INT_MIN;
}
inline bool HeartbeatInfo::changed(const HeartbeatInfo& old) const {
return health != old.health ||
hbstate != old.hbstate;
}
inline string MemberState::toString() const {
switch ( s ) {
case RS_STARTUP: return "STARTUP";
case RS_PRIMARY: return "PRIMARY";
case RS_SECONDARY: return "SECONDARY";
case RS_RECOVERING: return "RECOVERING";
case RS_FATAL: return "FATAL";
case RS_STARTUP2: return "STARTUP2";
case RS_ARBITER: return "ARBITER";
case RS_DOWN: return "DOWN";
case RS_ROLLBACK: return "ROLLBACK";
case RS_UNKNOWN: return "UNKNOWN";
case RS_SHUNNED: return "REMOVED";
}
return "";
}
}
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