ceph/src/messages/MWatchNotify.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_MWATCHNOTIFY_H
  17 #define CEPH_MWATCHNOTIFY_H
  18
  19 #include "msg/Message.h"
  20
  21
  22 class MWatchNotify : public Message {
  23   static const int HEAD_VERSION = 3;
  24   static const int COMPAT_VERSION = 1;
  25
  26  public:
  27   uint64_t cookie;     ///< client unique id for this watch or notify
  28   uint64_t ver;        ///< unused
  29   uint64_t notify_id;  ///< osd unique id for a notify notification
  30   uint8_t opcode;      ///< CEPH_WATCH_EVENT_*
  31   bufferlist bl;       ///< notify payload (osd->client)
  32   errorcode32_t return_code; ///< notify result (osd->client)
  33   uint64_t notifier_gid; ///< who sent the notify
  34
  35   MWatchNotify()
  36     : Message(CEPH_MSG_WATCH_NOTIFY, HEAD_VERSION, COMPAT_VERSION) { }
  37   MWatchNotify(uint64_t c, uint64_t v, uint64_t i, uint8_t o, bufferlist b)
  38     : Message(CEPH_MSG_WATCH_NOTIFY, HEAD_VERSION, COMPAT_VERSION),
  39       cookie(c),
  40       ver(v),
  41       notify_id(i),
  42       opcode(o),
  43       bl(b),
  44       return_code(0),
  45       notifier_gid(0) { }
  46 private:
  47   ~MWatchNotify() override {}
  48
  49 public:
  50   void decode_payload() override {
  51     uint8_t msg_ver;
  52     bufferlist::iterator p = payload.begin();
  53     ::decode(msg_ver, p);
  54     ::decode(opcode, p);
  55     ::decode(cookie, p);
  56     ::decode(ver, p);
  57     ::decode(notify_id, p);
  58     if (msg_ver >= 1)
  59       ::decode(bl, p);
  60     if (header.version >= 2)
  61       ::decode(return_code, p);
  62     else
  63       return_code = 0;
  64     if (header.version >= 3)
  65       ::decode(notifier_gid, p);
  66     else
  67       notifier_gid = 0;
  68   }
  69   void encode_payload(uint64_t features) override {
  70     uint8_t msg_ver = 1;
  71     ::encode(msg_ver, payload);
  72     ::encode(opcode, payload);
  73     ::encode(cookie, payload);
  74     ::encode(ver, payload);
  75     ::encode(notify_id, payload);
  76     ::encode(bl, payload);
  77     ::encode(return_code, payload);
  78     ::encode(notifier_gid, payload);
  79   }
  80
  81   const char *get_type_name() const override { return "watch-notify"; }
  82   void print(ostream& out) const override {
  83     out << "watch-notify("
  84         << ceph_watch_event_name(opcode) << " (" << (int)opcode << ")"
  85         << " cookie " << cookie
  86         << " notify " << notify_id
  87         << " ret " << return_code
  88         << ")";
  89   }
  90 };
  91
  92 #endif