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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) 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_MMONSUBSCRIBE_H
#define CEPH_MMONSUBSCRIBE_H
#include "msg/Message.h"
#include "include/ceph_features.h"
/*
* compatibility with old crap
*/
struct ceph_mon_subscribe_item_old {
ceph_le64 unused;
ceph_le64 have;
__u8 onetime;
} __attribute__ ((packed));
WRITE_RAW_ENCODER(ceph_mon_subscribe_item_old)
class MMonSubscribe : public MessageInstance<MMonSubscribe> {
public:
friend factory;
static constexpr int HEAD_VERSION = 3;
static constexpr int COMPAT_VERSION = 1;
string hostname;
map<string, ceph_mon_subscribe_item> what;
MMonSubscribe() : MessageInstance(CEPH_MSG_MON_SUBSCRIBE, HEAD_VERSION, COMPAT_VERSION) { }
private:
~MMonSubscribe() override {}
public:
void sub_want(const char *w, version_t start, unsigned flags) {
what[w].start = start;
what[w].flags = flags;
}
std::string_view get_type_name() const override { return "mon_subscribe"; }
void print(ostream& o) const override {
o << "mon_subscribe(" << what << ")";
}
void decode_payload() override {
auto p = payload.cbegin();
if (header.version < 2) {
map<string, ceph_mon_subscribe_item_old> oldwhat;
decode(oldwhat, p);
what.clear();
for (map<string, ceph_mon_subscribe_item_old>::iterator q = oldwhat.begin();
q != oldwhat.end();
q++) {
if (q->second.have)
what[q->first].start = q->second.have + 1;
else
what[q->first].start = 0;
what[q->first].flags = 0;
if (q->second.onetime)
what[q->first].flags |= CEPH_SUBSCRIBE_ONETIME;
}
return;
}
decode(what, p);
if (header.version >= 3) {
decode(hostname, p);
}
}
void encode_payload(uint64_t features) override {
using ceph::encode;
if ((features & CEPH_FEATURE_SUBSCRIBE2) == 0) {
header.version = 0;
map<string, ceph_mon_subscribe_item_old> oldwhat;
for (map<string, ceph_mon_subscribe_item>::iterator q = what.begin();
q != what.end();
q++) {
if (q->second.start)
// warning: start=1 -> have=0, which was ambiguous
oldwhat[q->first].have = q->second.start - 1;
else
oldwhat[q->first].have = 0;
oldwhat[q->first].onetime = q->second.flags & CEPH_SUBSCRIBE_ONETIME;
}
encode(oldwhat, payload);
return;
}
header.version = HEAD_VERSION;
encode(what, payload);
encode(hostname, payload);
}
};
#endif
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