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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) 2004-2010 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.
*
* Client requests often need to get forwarded from some monitor
* to the leader. This class encapsulates the original message
* along with the client's caps so the leader can do proper permissions
* checking.
*/
#ifndef CEPH_MFORWARD_H
#define CEPH_MFORWARD_H
#include "msg/Message.h"
#include "mon/MonCap.h"
#include "include/encoding.h"
#include "include/stringify.h"
class MForward : public MessageInstance<MForward> {
public:
friend factory;
uint64_t tid;
uint8_t client_type;
entity_addrvec_t client_addrs;
entity_addr_t client_socket_addr;
MonCap client_caps;
uint64_t con_features;
EntityName entity_name;
PaxosServiceMessage *msg; // incoming or outgoing message
string msg_desc; // for operator<< only
static constexpr int HEAD_VERSION = 4;
static constexpr int COMPAT_VERSION = 4;
MForward() : MessageInstance(MSG_FORWARD, HEAD_VERSION, COMPAT_VERSION),
tid(0), con_features(0), msg(NULL) {}
MForward(uint64_t t, PaxosServiceMessage *m, uint64_t feat,
const MonCap& caps) :
MessageInstance(MSG_FORWARD, HEAD_VERSION, COMPAT_VERSION),
tid(t), client_caps(caps), msg(NULL) {
client_type = m->get_source().type();
client_addrs = m->get_source_addrs();
if (auto con = m->get_connection()) {
client_socket_addr = con->get_peer_socket_addr();
}
con_features = feat;
msg = (PaxosServiceMessage*)m->get();
}
private:
~MForward() override {
if (msg) {
// message was unclaimed
msg->put();
msg = NULL;
}
}
public:
void encode_payload(uint64_t features) override {
using ceph::encode;
if (!HAVE_FEATURE(features, SERVER_NAUTILUS)) {
header.version = 3;
header.compat_version = 3;
encode(tid, payload);
entity_inst_t client;
client.name = entity_name_t(client_type, -1);
client.addr = client_addrs.legacy_addr();
encode(client, payload, features);
encode(client_caps, payload, features);
// Encode client message with intersection of target and source
// features. This could matter if the semantics of the encoded
// message are changed when reencoding with more features than the
// client had originally. That should never happen, but we may as
// well be defensive here.
if (con_features != features) {
msg->clear_payload();
}
encode_message(msg, features & con_features, payload);
encode(con_features, payload);
encode(entity_name, payload);
return;
}
header.version = HEAD_VERSION;
header.compat_version = COMPAT_VERSION;
encode(tid, payload);
encode(client_type, payload, features);
encode(client_addrs, payload, features);
encode(client_socket_addr, payload, features);
encode(client_caps, payload, features);
// Encode client message with intersection of target and source
// features. This could matter if the semantics of the encoded
// message are changed when reencoding with more features than the
// client had originally. That should never happen, but we may as
// well be defensive here.
if (con_features != features) {
msg->clear_payload();
}
encode_message(msg, features & con_features, payload);
encode(con_features, payload);
encode(entity_name, payload);
}
void decode_payload() override {
auto p = payload.cbegin();
decode(tid, p);
if (header.version < 4) {
entity_inst_t client;
decode(client, p);
client_type = client.name.type();
client_addrs = entity_addrvec_t(client.addr);
client_socket_addr = client.addr;
} else {
decode(client_type, p);
decode(client_addrs, p);
decode(client_socket_addr, p);
}
decode(client_caps, p);
msg = (PaxosServiceMessage *)decode_message(NULL, 0, p);
decode(con_features, p);
decode(entity_name, p);
}
PaxosServiceMessage *claim_message() {
// let whoever is claiming the message deal with putting it.
ceph_assert(msg);
msg_desc = stringify(*msg);
PaxosServiceMessage *m = msg;
msg = NULL;
return m;
}
std::string_view get_type_name() const override { return "forward"; }
void print(ostream& o) const override {
o << "forward(";
if (msg) {
o << *msg;
} else {
o << msg_desc;
}
o << " caps " << client_caps
<< " tid " << tid
<< " con_features " << con_features << ")";
}
};
#endif
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