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 Message {
  24
  25   static const int HEAD_VERSION = 3;
  26   static const int COMPAT_VERSION = 3;
  27
  28  public:
  29   // op types
  30   const static int OP_COLLECT =   1; // proposer: propose round
  31   const static int OP_LAST =      2; // voter:    accept proposed round
  32   const static int OP_BEGIN =     3; // proposer: value proposed for this round
  33   const static int OP_ACCEPT =    4; // voter:    accept propsed value
  34   const static int OP_COMMIT =    5; // proposer: notify learners of agreed value
  35   const static int OP_LEASE =     6; // leader: extend peon lease
  36   const static int OP_LEASE_ACK = 7; // peon: lease ack
  37   const static char *get_opname(int op) {
  38     switch (op) {
  39     case OP_COLLECT: return "collect";
  40     case OP_LAST: return "last";
  41     case OP_BEGIN: return "begin";
  42     case OP_ACCEPT: return "accept";
  43     case OP_COMMIT: return "commit";
  44     case OP_LEASE: return "lease";
  45     case OP_LEASE_ACK: return "lease_ack";
  46     default: ceph_abort(); return 0;
  47     }
  48   }
  49
  50   epoch_t epoch;   // monitor epoch
  51   __s32 op;          // paxos op
  52
  53   version_t first_committed;  // i've committed to
  54   version_t last_committed;  // i've committed to
  55   version_t pn_from;         // i promise to accept after
  56   version_t pn;              // with with proposal
  57   version_t uncommitted_pn;     // previous pn, if we are a LAST with an uncommitted value
  58   utime_t lease_timestamp;
  59   utime_t sent_timestamp;
  60
  61   version_t latest_version;
  62   bufferlist latest_value;
  63
  64   map<version_t,bufferlist> values;
  65
  66   MMonPaxos() : Message(MSG_MON_PAXOS, HEAD_VERSION, COMPAT_VERSION) { }
  67   MMonPaxos(epoch_t e, int o, utime_t now) :
  68     Message(MSG_MON_PAXOS, HEAD_VERSION, COMPAT_VERSION),
  69     epoch(e),
  70     op(o),
  71     first_committed(0), last_committed(0), pn_from(0), pn(0), uncommitted_pn(0),
  72     sent_timestamp(now),
  73     latest_version(0) {
  74   }
  75
  76 private:
  77   ~MMonPaxos() override {}
  78
  79 public:
  80   const char *get_type_name() const override { return "paxos"; }
  81
  82   void print(ostream& out) const override {
  83     out << "paxos(" << get_opname(op)
  84         << " lc " << last_committed
  85         << " fc " << first_committed
  86         << " pn " << pn << " opn " << uncommitted_pn;
  87     if (latest_version)
  88       out << " latest " << latest_version << " (" << latest_value.length() << " bytes)";
  89     out <<  ")";
  90   }
  91
  92   void encode_payload(uint64_t features) override {
  93     header.version = HEAD_VERSION;
  94     ::encode(epoch, payload);
  95     ::encode(op, payload);
  96     ::encode(first_committed, payload);
  97     ::encode(last_committed, payload);
  98     ::encode(pn_from, payload);
  99     ::encode(pn, payload);
 100     ::encode(uncommitted_pn, payload);
 101     ::encode(lease_timestamp, payload);
 102     ::encode(sent_timestamp, payload);
 103     ::encode(latest_version, payload);
 104     ::encode(latest_value, payload);
 105     ::encode(values, payload);
 106   }
 107   void decode_payload() override {
 108     bufferlist::iterator p = payload.begin();
 109     ::decode(epoch, p);
 110     ::decode(op, p);
 111     ::decode(first_committed, p);
 112     ::decode(last_committed, p);
 113     ::decode(pn_from, p);
 114     ::decode(pn, p);
 115     ::decode(uncommitted_pn, p);
 116     ::decode(lease_timestamp, p);
 117     ::decode(sent_timestamp, p);
 118     ::decode(latest_version, p);
 119     ::decode(latest_value, p);
 120     ::decode(values, p);
 121   }
 122 };
 123
 124 #endif