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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.
*/
/** replica set member */
#pragma once
#include <ostream>
#include <string>
#include <type_traits>
#include "mongo/base/error_codes.h"
#include "mongo/base/static_assert.h"
#include "mongo/base/status_with.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
namespace repl {
/*
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_STARTUP2 loaded config, still determining who is primary
State -> integer mappings are reserved forever. Do not change them or delete them, except
to update RS_MAX when introducing new states.
*/
struct MemberState {
enum MS {
RS_STARTUP = 0,
RS_PRIMARY = 1,
RS_SECONDARY = 2,
RS_RECOVERING = 3,
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_REMOVED = 10, /* node removed from replica set */
RS_MAX = 10
} s;
template <typename T>
static StatusWith<MemberState> create(T t) {
MONGO_STATIC_ASSERT_MSG(std::is_integral<T>::value, "T must be an integral type");
using UnderlyingType = std::underlying_type<MS>::type;
if (std::is_signed<T>::value && (t < 0))
return {ErrorCodes::BadValue, str::stream() << "MemberState cannot be negative"};
auto asUnderlying = static_cast<UnderlyingType>(t);
if (asUnderlying > RS_MAX)
return {ErrorCodes::BadValue, str::stream() << "Unrecognized numerical state"};
return {static_cast<MemberState>(asUnderlying)};
}
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 rollback() const {
return s == RS_ROLLBACK;
}
bool readable() const {
return s == RS_PRIMARY || s == RS_SECONDARY;
}
bool removed() const {
return s == RS_REMOVED;
}
bool arbiter() const {
return s == RS_ARBITER;
}
std::string toString() const;
bool operator==(const MemberState& r) const {
return s == r.s;
}
bool operator!=(const MemberState& r) const {
return s != r.s;
}
};
inline std::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_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_REMOVED:
return "REMOVED";
}
return "";
}
/**
* Insertion operator for MemberState. Formats member state for output stream.
* For testing only.
*/
inline std::ostream& operator<<(std::ostream& os, const MemberState& state) {
return os << state.toString();
}
} // namespace repl
} // namespace mongo
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