// -*- 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_MMONPROBE_H
#define CEPH_MMONPROBE_H

#include "include/ceph_features.h"
#include "msg/Message.h"
#include "mon/MonMap.h"

class MMonProbe : public Message {
public:
  static const int HEAD_VERSION = 6;
  static const int COMPAT_VERSION = 5;

  enum {
    OP_PROBE = 1,
    OP_REPLY = 2,
    OP_SLURP = 3,
    OP_SLURP_LATEST = 4,
    OP_DATA = 5,
    OP_MISSING_FEATURES = 6,
  };

  static const char *get_opname(int o) {
    switch (o) {
    case OP_PROBE: return "probe";
    case OP_REPLY: return "reply";
    case OP_SLURP: return "slurp";
    case OP_SLURP_LATEST: return "slurp_latest";
    case OP_DATA: return "data";
    case OP_MISSING_FEATURES: return "missing_features";
    default: assert(0); return 0;
    }
  }
  
  uuid_d fsid;
  int32_t op;
  string name;
  set<int32_t> quorum;
  bufferlist monmap_bl;
  version_t paxos_first_version;
  version_t paxos_last_version;
  bool has_ever_joined;
  uint64_t required_features;

  MMonProbe()
    : Message(MSG_MON_PROBE, HEAD_VERSION, COMPAT_VERSION) {}
  MMonProbe(const uuid_d& f, int o, const string& n, bool hej)
    : Message(MSG_MON_PROBE, HEAD_VERSION, COMPAT_VERSION),
      fsid(f),
      op(o),
      name(n),
      paxos_first_version(0),
      paxos_last_version(0),
      has_ever_joined(hej),
      required_features(0) {}
private:
  ~MMonProbe() {}

public:  
  const char *get_type_name() const { return "mon_probe"; }
  void print(ostream& out) const {
    out << "mon_probe(" << get_opname(op) << " " << fsid << " name " << name;
    if (quorum.size())
      out << " quorum " << quorum;
    if (op == OP_REPLY) {
      out << " paxos("
	<< " fc " << paxos_first_version
	<< " lc " << paxos_last_version
	<< " )";
    }
    if (!has_ever_joined)
      out << " new";
    if (required_features)
      out << " required_features " << required_features;
    out << ")";
  }
  
  void encode_payload(uint64_t features) {
    if (monmap_bl.length() && (features & CEPH_FEATURE_MONENC) == 0) {
      // reencode old-format monmap
      MonMap t;
      t.decode(monmap_bl);
      monmap_bl.clear();
      t.encode(monmap_bl, features);
    }

    ::encode(fsid, payload);
    ::encode(op, payload);
    ::encode(name, payload);
    ::encode(quorum, payload);
    ::encode(monmap_bl, payload);
    ::encode(has_ever_joined, payload);
    ::encode(paxos_first_version, payload);
    ::encode(paxos_last_version, payload);
    ::encode(required_features, payload);
  }
  void decode_payload() {
    bufferlist::iterator p = payload.begin();
    ::decode(fsid, p);
    ::decode(op, p);
    ::decode(name, p);
    ::decode(quorum, p);
    ::decode(monmap_bl, p);
    ::decode(has_ever_joined, p);
    ::decode(paxos_first_version, p);
    ::decode(paxos_last_version, p);
    if (header.version >= 6)
      ::decode(required_features, p);
    else
      required_features = 0;
  }
};

#endif
