// -*- 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_MCLIENTRECONNECT_H
#define CEPH_MCLIENTRECONNECT_H

#include "msg/Message.h"
#include "mds/mdstypes.h"
#include "include/ceph_features.h"


class MClientReconnect : public Message {

  const static int HEAD_VERSION = 3;

public:
  map<inodeno_t, cap_reconnect_t>  caps;   // only head inodes
  vector<ceph_mds_snaprealm_reconnect> realms;

  MClientReconnect() : Message(CEPH_MSG_CLIENT_RECONNECT, HEAD_VERSION) { }
private:
  ~MClientReconnect() override {}

public:
  const char *get_type_name() const override { return "client_reconnect"; }
  void print(ostream& out) const override {
    out << "client_reconnect("
	<< caps.size() << " caps)";
  }

  void add_cap(inodeno_t ino, uint64_t cap_id, inodeno_t pathbase, const string& path,
	       int wanted, int issued, inodeno_t sr, snapid_t sf, bufferlist& lb)
  {
    caps[ino] = cap_reconnect_t(cap_id, pathbase, path, wanted, issued, sr, sf, lb);
  }
  void add_snaprealm(inodeno_t ino, snapid_t seq, inodeno_t parent) {
    ceph_mds_snaprealm_reconnect r;
    r.ino = ino;
    r.seq = seq;
    r.parent = parent;
    realms.push_back(r);
  }

  void encode_payload(uint64_t features) override {
    data.clear();
    if (features & CEPH_FEATURE_MDSENC) {
      ::encode(caps, data);
      header.version = HEAD_VERSION;
    } else if (features & CEPH_FEATURE_FLOCK) {
      // encode with old cap_reconnect_t encoding
      __u32 n = caps.size();
      ::encode(n, data);
      for (map<inodeno_t,cap_reconnect_t>::iterator p = caps.begin(); p != caps.end(); ++p) {
	::encode(p->first, data);
	p->second.encode_old(data);
      }
      header.version = 2;
    } else {
      // compat crap
      header.version = 1;
      map<inodeno_t, old_cap_reconnect_t> ocaps;
      for (map<inodeno_t,cap_reconnect_t>::iterator p = caps.begin(); p != caps.end(); p++)
	ocaps[p->first] = p->second;
      ::encode(ocaps, data);
    }
    ::encode_nohead(realms, data);
  }
  void decode_payload() override {
    bufferlist::iterator p = data.begin();
    if (header.version >= 3) {
      // new protocol
      ::decode(caps, p);
    } else if (header.version == 2) {
      __u32 n;
      ::decode(n, p);
      inodeno_t ino;
      while (n--) {
	::decode(ino, p);
	caps[ino].decode_old(p);
      }
    } else {
      // compat crap
      map<inodeno_t, old_cap_reconnect_t> ocaps;
      ::decode(ocaps, p);
      for (map<inodeno_t,old_cap_reconnect_t>::iterator q = ocaps.begin(); q != ocaps.end(); q++)
	caps[q->first] = q->second;
    }
    while (!p.end()) {
      realms.push_back(ceph_mds_snaprealm_reconnect());
      ::decode(realms.back(), p);
    }
  }

};


#endif