ceph/src/messages/MMonPaxos.h

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3 /*
   4  * Ceph - scalable distributed file system
   5  *
   6  * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
   7  *
   8  * This is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License version 2.1, as published by the Free Software
  11  * Foundation.  See file COPYING.
  12  *
  13  */
  14
  15
  16 #ifndef CEPH_MMONPAXOS_H
  17 #define CEPH_MMONPAXOS_H
  18
  19 #include "messages/PaxosServiceMessage.h"
  20 #include "mon/mon_types.h"
  21 #include "include/ceph_features.h"
  22
  23 class MMonPaxos : public MessageInstance<MMonPaxos> {
  24 public:
  25   friend factory;
  26 private:
  27   static constexpr int HEAD_VERSION = 4;
  28   static constexpr int COMPAT_VERSION = 3;
  29
  30  public:
  31   // op types
  32   static constexpr int OP_COLLECT =   1; // proposer: propose round
  33   static constexpr int OP_LAST =      2; // voter:    accept proposed round
  34   static constexpr int OP_BEGIN =     3; // proposer: value proposed for this round
  35   static constexpr int OP_ACCEPT =    4; // voter:    accept propsed value
  36   static constexpr int OP_COMMIT =    5; // proposer: notify learners of agreed value
  37   static constexpr int OP_LEASE =     6; // leader: extend peon lease
  38   static constexpr int OP_LEASE_ACK = 7; // peon: lease ack
  39   static const char *get_opname(int op) {
  40     switch (op) {
  41     case OP_COLLECT: return "collect";
  42     case OP_LAST: return "last";
  43     case OP_BEGIN: return "begin";
  44     case OP_ACCEPT: return "accept";
  45     case OP_COMMIT: return "commit";
  46     case OP_LEASE: return "lease";
  47     case OP_LEASE_ACK: return "lease_ack";
  48     default: ceph_abort(); return 0;
  49     }
  50   }
  51
  52   epoch_t epoch = 0;   // monitor epoch
  53   __s32 op = 0;          // paxos op
  54
  55   version_t first_committed = 0;  // i've committed to
  56   version_t last_committed = 0;  // i've committed to
  57   version_t pn_from = 0;         // i promise to accept after
  58   version_t pn = 0;              // with with proposal
  59   version_t uncommitted_pn = 0;     // previous pn, if we are a LAST with an uncommitted value
  60   utime_t lease_timestamp;
  61   utime_t sent_timestamp;
  62
  63   version_t latest_version = 0;
  64   bufferlist latest_value;
  65
  66   map<version_t,bufferlist> values;
  67
  68   bufferlist feature_map;
  69
  70   MMonPaxos() : MessageInstance(MSG_MON_PAXOS, HEAD_VERSION, COMPAT_VERSION) { }
  71   MMonPaxos(epoch_t e, int o, utime_t now) :
  72     MessageInstance(MSG_MON_PAXOS, HEAD_VERSION, COMPAT_VERSION),
  73     epoch(e),
  74     op(o),
  75     first_committed(0), last_committed(0), pn_from(0), pn(0), uncommitted_pn(0),
  76     sent_timestamp(now),
  77     latest_version(0) {
  78   }
  79
  80 private:
  81   ~MMonPaxos() override {}
  82
  83 public:
  84   std::string_view get_type_name() const override { return "paxos"; }
  85
  86   void print(ostream& out) const override {
  87     out << "paxos(" << get_opname(op)
  88         << " lc " << last_committed
  89         << " fc " << first_committed
  90         << " pn " << pn << " opn " << uncommitted_pn;
  91     if (latest_version)
  92       out << " latest " << latest_version << " (" << latest_value.length() << " bytes)";
  93     out <<  ")";
  94   }
  95
  96   void encode_payload(uint64_t features) override {
  97     using ceph::encode;
  98     header.version = HEAD_VERSION;
  99     encode(epoch, payload);
 100     encode(op, payload);
 101     encode(first_committed, payload);
 102     encode(last_committed, payload);
 103     encode(pn_from, payload);
 104     encode(pn, payload);
 105     encode(uncommitted_pn, payload);
 106     encode(lease_timestamp, payload);
 107     encode(sent_timestamp, payload);
 108     encode(latest_version, payload);
 109     encode(latest_value, payload);
 110     encode(values, payload);
 111     encode(feature_map, payload);
 112   }
 113   void decode_payload() override {
 114     auto p = payload.cbegin();
 115     decode(epoch, p);
 116     decode(op, p);
 117     decode(first_committed, p);
 118     decode(last_committed, p);
 119     decode(pn_from, p);
 120     decode(pn, p);
 121     decode(uncommitted_pn, p);
 122     decode(lease_timestamp, p);
 123     decode(sent_timestamp, p);
 124     decode(latest_version, p);
 125     decode(latest_value, p);
 126     decode(values, p);
 127     if (header.version >= 4) {
 128       decode(feature_map, p);
 129     }
 130   }
 131 };
 132
 133 #endif