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// -*- 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) 2012 Inktank, Inc.
*
* 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_MMONSYNC_H
#define CEPH_MMONSYNC_H
#include "msg/Message.h"
class MMonSync : public Message
{
static const int HEAD_VERSION = 1;
static const int COMPAT_VERSION = 1;
public:
/**
* Operation types
*/
enum {
/**
* Start synchronization request
* (mon.X -> Leader)
*/
OP_START = 1,
/**
* Reply to an OP_START
* (Leader -> mon.X)
*/
OP_START_REPLY = 2,
/**
* Let the Leader know we are still synchronizing
* (mon.X -> Leader)
*/
OP_HEARTBEAT = 3,
/**
* Reply to a hearbeat
* (Leader -> mon.X)
*/
OP_HEARTBEAT_REPLY = 4,
/**
* Let the Leader know we finished synchronizing
* (mon.X -> Leader)
*/
OP_FINISH = 5,
/**
* Request a given monitor (mon.Y) to start synchronizing with us, hence
* sending us chunks.
* (mon.X -> mon.Y)
*/
OP_START_CHUNKS = 6,
/**
* Send a chunk to a given monitor (mon.X)
* (mon.Y -> mon.X)
*/
OP_CHUNK = 7,
/**
* Acknowledge that we received the last chunk sent
* (mon.X -> mon.Y)
*/
OP_CHUNK_REPLY = 8,
/**
* Reply to an OP_FINISH
* (Leader -> mon.X)
*/
OP_FINISH_REPLY = 9,
/**
* Let the receiver know that he should abort whatever he is in the middle
* of doing with the sender.
*/
OP_ABORT = 10,
};
/**
* Chunk is the last available
*/
const static uint8_t FLAG_LAST = 0x01;
/**
* Let the other monitor it should retry again its last operation.
*/
const static uint8_t FLAG_RETRY = 0x02;
/**
* This message contains a crc
*/
const static uint8_t FLAG_CRC = 0x04;
/**
* Do not reply to this message to the sender, but to @p reply_to.
*/
const static uint8_t FLAG_REPLY_TO = 0x08;
/**
* Obtain a string corresponding to the operation type @p op
*
* @param op Operation type
* @returns A string
*/
static const char *get_opname(int op) {
switch (op) {
case OP_START: return "start";
case OP_START_REPLY: return "start_reply";
case OP_HEARTBEAT: return "heartbeat";
case OP_HEARTBEAT_REPLY: return "heartbeat_reply";
case OP_FINISH: return "finish";
case OP_FINISH_REPLY: return "finish_reply";
case OP_START_CHUNKS: return "start_chunks";
case OP_CHUNK: return "chunk";
case OP_CHUNK_REPLY: return "chunk_reply";
case OP_ABORT: return "abort";
default: assert("unknown op type"); return NULL;
}
}
uint32_t op;
uint8_t flags;
version_t version;
bufferlist chunk_bl;
pair<string,string> last_key;
__u32 crc;
entity_inst_t reply_to;
MMonSync()
: Message(MSG_MON_SYNC, HEAD_VERSION, COMPAT_VERSION)
{ }
MMonSync(uint32_t op)
: Message(MSG_MON_SYNC, HEAD_VERSION, COMPAT_VERSION),
op(op), flags(0), version(0), crc(0)
{ }
MMonSync(uint32_t op, bufferlist bl, uint8_t flags = 0)
: Message(MSG_MON_SYNC, HEAD_VERSION, COMPAT_VERSION),
op(op), flags(flags), version(0), chunk_bl(bl), crc(0)
{ }
MMonSync(MMonSync *m)
: Message(MSG_MON_SYNC, HEAD_VERSION, COMPAT_VERSION),
op(m->op), flags(m->flags), version(m->version),
chunk_bl(m->chunk_bl), last_key(m->last_key),
crc(m->crc), reply_to(m->reply_to)
{ }
/**
* Obtain this message type's name */
const char *get_type_name() const { return "mon_sync"; }
void set_reply_to(entity_inst_t other) {
reply_to = other;
flags |= FLAG_REPLY_TO;
}
/**
* Print this message in a pretty format to @p out
*
* @param out The output stream to output to
*/
void print(ostream& out) const {
out << "mon_sync( " << get_opname(op);
if (version > 0)
out << " v " << version;
if (flags) {
out << " flags( ";
if (flags & FLAG_LAST)
out << "last ";
if (flags & FLAG_RETRY)
out << "retry ";
if (flags & FLAG_CRC)
out << "crc(" << crc << ") ";
if (flags & FLAG_REPLY_TO)
out << "reply-to(" << reply_to << ") ";
out << ")";
}
if (chunk_bl.length())
out << " bl " << chunk_bl.length() << " bytes";
if (!last_key.first.empty() || !last_key.second.empty()) {
out << " last_key ( " << last_key.first << ","
<< last_key.second << " )";
}
out << " )";
}
/**
* Encode this message into the Message's payload
*/
void encode_payload(uint64_t features) {
::encode(op, payload);
::encode(flags, payload);
::encode(version, payload);
::encode(chunk_bl, payload);
::encode(last_key.first, payload);
::encode(last_key.second, payload);
::encode(crc, payload);
::encode(reply_to, payload);
}
/**
* Decode the message's payload into this message
*/
void decode_payload() {
bufferlist::iterator p = payload.begin();
::decode(op, p);
::decode(flags, p);
::decode(version, p);
::decode(chunk_bl, p);
::decode(last_key.first, p);
::decode(last_key.second, p);
::decode(crc, p);
::decode(reply_to, p);
}
};
#endif /* CEPH_MMONSYNC_H */
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