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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#ifndef CEPH_MMONPAXOS_H
#define CEPH_MMONPAXOS_H
#include "messages/PaxosServiceMessage.h"
#include "mon/mon_types.h"
#include "include/ceph_features.h"
class MMonPaxos : public MessageInstance<MMonPaxos> {
public:
friend factory;
private:
static constexpr int HEAD_VERSION = 4;
static constexpr int COMPAT_VERSION = 3;
public:
// op types
static constexpr int OP_COLLECT = 1; // proposer: propose round
static constexpr int OP_LAST = 2; // voter: accept proposed round
static constexpr int OP_BEGIN = 3; // proposer: value proposed for this round
static constexpr int OP_ACCEPT = 4; // voter: accept propsed value
static constexpr int OP_COMMIT = 5; // proposer: notify learners of agreed value
static constexpr int OP_LEASE = 6; // leader: extend peon lease
static constexpr int OP_LEASE_ACK = 7; // peon: lease ack
static const char *get_opname(int op) {
switch (op) {
case OP_COLLECT: return "collect";
case OP_LAST: return "last";
case OP_BEGIN: return "begin";
case OP_ACCEPT: return "accept";
case OP_COMMIT: return "commit";
case OP_LEASE: return "lease";
case OP_LEASE_ACK: return "lease_ack";
default: ceph_abort(); return 0;
}
}
epoch_t epoch = 0; // monitor epoch
__s32 op = 0; // paxos op
version_t first_committed = 0; // i've committed to
version_t last_committed = 0; // i've committed to
version_t pn_from = 0; // i promise to accept after
version_t pn = 0; // with with proposal
version_t uncommitted_pn = 0; // previous pn, if we are a LAST with an uncommitted value
utime_t lease_timestamp;
utime_t sent_timestamp;
version_t latest_version = 0;
bufferlist latest_value;
map<version_t,bufferlist> values;
bufferlist feature_map;
MMonPaxos() : MessageInstance(MSG_MON_PAXOS, HEAD_VERSION, COMPAT_VERSION) { }
MMonPaxos(epoch_t e, int o, utime_t now) :
MessageInstance(MSG_MON_PAXOS, HEAD_VERSION, COMPAT_VERSION),
epoch(e),
op(o),
first_committed(0), last_committed(0), pn_from(0), pn(0), uncommitted_pn(0),
sent_timestamp(now),
latest_version(0) {
}
private:
~MMonPaxos() override {}
public:
std::string_view get_type_name() const override { return "paxos"; }
void print(ostream& out) const override {
out << "paxos(" << get_opname(op)
<< " lc " << last_committed
<< " fc " << first_committed
<< " pn " << pn << " opn " << uncommitted_pn;
if (latest_version)
out << " latest " << latest_version << " (" << latest_value.length() << " bytes)";
out << ")";
}
void encode_payload(uint64_t features) override {
using ceph::encode;
header.version = HEAD_VERSION;
encode(epoch, payload);
encode(op, payload);
encode(first_committed, payload);
encode(last_committed, payload);
encode(pn_from, payload);
encode(pn, payload);
encode(uncommitted_pn, payload);
encode(lease_timestamp, payload);
encode(sent_timestamp, payload);
encode(latest_version, payload);
encode(latest_value, payload);
encode(values, payload);
encode(feature_map, payload);
}
void decode_payload() override {
auto p = payload.cbegin();
decode(epoch, p);
decode(op, p);
decode(first_committed, p);
decode(last_committed, p);
decode(pn_from, p);
decode(pn, p);
decode(uncommitted_pn, p);
decode(lease_timestamp, p);
decode(sent_timestamp, p);
decode(latest_version, p);
decode(latest_value, p);
decode(values, p);
if (header.version >= 4) {
decode(feature_map, p);
}
}
};
#endif
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