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Merge pull request #3163 

628b78ae Fix in_peers/out_peers RPC operations (Erik de Castro Lopo)
ece9bcf5 rpc_client: Fix error handling (Erik de Castro Lopo)
8f30350d Fix method name in invoke_http_json_rpc (Erik de Castro Lopo)
32c0f908 Allow the number of incoming connections to be limited (Erik de Castro Lopo)
d609a2c1 Rename delete_connections to delete_out_connections (Erik de Castro Lopo)
b927c0fc Rename connections_count to max_out_connection_count (Erik de Castro Lopo)
This commit is contained in:
Riccardo Spagni 2018-02-16 14:18:38 +01:00
parent 0bffd2ec64 628b78ae8a
commit 381faf06c7
No known key found for this signature in database
GPG Key ID: 55432DF31CCD4FCD
15 changed files with 231 additions and 66 deletions
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78
contrib/epee/include/net/levin_protocol_handler_async.h
View File

@ -77,6 +77,8 @@ class async_protocol_handler_config
levin_commands_handler<t_connection_context>* m_pcommands_handler;
void (*m_pcommands_handler_destroy)(levin_commands_handler<t_connection_context>*);
void delete_connections (size_t count, bool incoming);
public:
typedef t_connection_context connection_context;
uint64_t m_max_packet_size;
@ -101,6 +103,7 @@ public:
{}
~async_protocol_handler_config() { set_handler(NULL, NULL); }
void del_out_connections(size_t count);
void del_in_connections(size_t count);
};
@ -731,41 +734,50 @@ void async_protocol_handler_config<t_connection_context>::del_connection(async_p
}
//------------------------------------------------------------------------------------------
template<class t_connection_context>
void async_protocol_handler_config<t_connection_context>::delete_connections(size_t count, bool incoming)
{
std::vector <boost::uuids::uuid> connections;
CRITICAL_REGION_BEGIN(m_connects_lock);
for (auto& c: m_connects)
{
if (c.second->m_connection_context.m_is_income == incoming)
connections.push_back(c.first);
}
// close random connections from the provided set
// TODO or better just keep removing random elements (performance)
unsigned seed = std::chrono::system_clock::now().time_since_epoch().count();
shuffle(connections.begin(), connections.end(), std::default_random_engine(seed));
while (count > 0 && connections.size() > 0)
{
try
{
auto i = connections.end() - 1;
async_protocol_handler<t_connection_context> *conn = m_connects.at(*i);
del_connection(conn);
close(*i);
connections.erase(i);
}
catch (const std::out_of_range &e)
{
MWARNING("Connection not found in m_connects, continuing");
}
--count;
}
CRITICAL_REGION_END();
}
//------------------------------------------------------------------------------------------
template<class t_connection_context>
void async_protocol_handler_config<t_connection_context>::del_out_connections(size_t count)
{
std::vector <boost::uuids::uuid> out_connections;
CRITICAL_REGION_BEGIN(m_connects_lock);
for (auto& c: m_connects)
{
if (!c.second->m_connection_context.m_is_income)
out_connections.push_back(c.first);
}
if (out_connections.size() == 0)
return;
// close random out connections
// TODO or better just keep removing random elements (performance)
unsigned seed = std::chrono::system_clock::now().time_since_epoch().count();
shuffle(out_connections.begin(), out_connections.end(), std::default_random_engine(seed));
while (count > 0 && out_connections.size() > 0)
{
try
{
auto i = out_connections.end() - 1;
async_protocol_handler<t_connection_context> *conn = m_connects.at(*i);
del_connection(conn);
close(*i);
out_connections.erase(i);
}
catch (const std::out_of_range &e)
{
MWARNING("Connection not found in m_connects, continuing");
}
--count;
}
CRITICAL_REGION_END();
delete_connections(count, false);
}
//------------------------------------------------------------------------------------------
template<class t_connection_context>
void async_protocol_handler_config<t_connection_context>::del_in_connections(size_t count)
{
delete_connections(count, true);
}
//------------------------------------------------------------------------------------------
template<class t_connection_context>

2
contrib/epee/include/storages/http_abstract_invoke.h
View File

@ -115,7 +115,7 @@ namespace epee
}
if(resp_t.error.code || resp_t.error.message.size())
{
LOG_ERROR("RPC call of \"" << method_name << "\" returned error: " << resp_t.error.code << ", message: " << resp_t.error.message);
LOG_ERROR("RPC call of \"" << req_t.method << "\" returned error: " << resp_t.error.code << ", message: " << resp_t.error.message);
return false;
}
result_struct = resp_t.result;

16
src/common/rpc_client.h
View File

@ -72,10 +72,10 @@ namespace tools
fail_msg_writer() << "Couldn't connect to daemon: " << m_http_client.get_host() << ":" << m_http_client.get_port();
return false;
}
ok = ok && epee::net_utils::invoke_http_json_rpc("/json_rpc", method_name, req, res, m_http_client, t_http_connection::TIMEOUT());
ok = epee::net_utils::invoke_http_json_rpc("/json_rpc", method_name, req, res, m_http_client, t_http_connection::TIMEOUT());
if (!ok)
{
fail_msg_writer() << "Daemon request failed";
fail_msg_writer() << "basic_json_rpc_request: Daemon request failed";
return false;
}
else
@ -95,15 +95,15 @@ namespace tools
t_http_connection connection(&m_http_client);
bool ok = connection.is_open();
ok = ok && epee::net_utils::invoke_http_json_rpc("/json_rpc", method_name, req, res, m_http_client, t_http_connection::TIMEOUT());
if (!ok)
{
fail_msg_writer() << "Couldn't connect to daemon: " << m_http_client.get_host() << ":" << m_http_client.get_port();
return false;
}
else if (res.status != CORE_RPC_STATUS_OK) // TODO - handle CORE_RPC_STATUS_BUSY ?
ok = epee::net_utils::invoke_http_json_rpc("/json_rpc", method_name, req, res, m_http_client, t_http_connection::TIMEOUT());
if (!ok || res.status != CORE_RPC_STATUS_OK) // TODO - handle CORE_RPC_STATUS_BUSY ?
{
fail_msg_writer() << fail_msg << " -- " << res.status;
fail_msg_writer() << fail_msg << " -- json_rpc_request: " << res.status;
return false;
}
else
@ -123,15 +123,15 @@ namespace tools
t_http_connection connection(&m_http_client);
bool ok = connection.is_open();
ok = ok && epee::net_utils::invoke_http_json(relative_url, req, res, m_http_client, t_http_connection::TIMEOUT());
if (!ok)
{
fail_msg_writer() << "Couldn't connect to daemon: " << m_http_client.get_host() << ":" << m_http_client.get_port();
return false;
}
else if (res.status != CORE_RPC_STATUS_OK) // TODO - handle CORE_RPC_STATUS_BUSY ?
ok = epee::net_utils::invoke_http_json(relative_url, req, res, m_http_client, t_http_connection::TIMEOUT());
if (!ok || res.status != CORE_RPC_STATUS_OK) // TODO - handle CORE_RPC_STATUS_BUSY ?
{
fail_msg_writer() << fail_msg << " -- " << res.status;
fail_msg_writer() << fail_msg << "-- rpc_request: " << res.status;
return false;
}
else

17
src/daemon/command_parser_executor.cpp
View File

@ -428,6 +428,23 @@ bool t_command_parser_executor::out_peers(const std::vector<std::string>& args)
return m_executor.out_peers(limit);
}
bool t_command_parser_executor::in_peers(const std::vector<std::string>& args)
{
if (args.empty()) return false;
unsigned int limit;
try {
limit = std::stoi(args[0]);
}
catch(const std::exception& ex) {
_erro("stoi exception");
return false;
}
return m_executor.in_peers(limit);
}
bool t_command_parser_executor::start_save_graph(const std::vector<std::string>& args)
{
if (!args.empty()) return false;

2
src/daemon/command_parser_executor.h
View File

@ -109,6 +109,8 @@ public:
bool out_peers(const std::vector<std::string>& args);
bool in_peers(const std::vector<std::string>& args);
bool start_save_graph(const std::vector<std::string>& args);
bool stop_save_graph(const std::vector<std::string>& args);

6
src/daemon/command_server.cpp
View File

@ -196,6 +196,12 @@ t_command_server::t_command_server(
, "out_peers <max_number>"
, "Set the <max_number> of out peers."
);
m_command_lookup.set_handler(
"in_peers"
, std::bind(&t_command_parser_executor::in_peers, &m_parser, p::_1)
, "in_peers <max_number>"
, "Set the <max_number> of in peers."
);
m_command_lookup.set_handler(
"start_save_graph"
, std::bind(&t_command_parser_executor::start_save_graph, &m_parser, p::_1)

34
src/daemon/rpc_command_executor.cpp
View File

@ -1262,7 +1262,7 @@ bool t_rpc_command_executor::out_peers(uint64_t limit)
if (m_is_rpc)
{
if (!m_rpc_client->json_rpc_request(req, res, "out_peers", fail_message.c_str()))
if (!m_rpc_client->rpc_request(req, res, "/out_peers", fail_message.c_str()))
{
return true;
}
@ -1281,6 +1281,38 @@ bool t_rpc_command_executor::out_peers(uint64_t limit)
return true;
}
bool t_rpc_command_executor::in_peers(uint64_t limit)
{
cryptonote::COMMAND_RPC_IN_PEERS::request req;
cryptonote::COMMAND_RPC_IN_PEERS::response res;
epee::json_rpc::error error_resp;
req.in_peers = limit;
std::string fail_message = "Unsuccessful";
if (m_is_rpc)
{
if (!m_rpc_client->rpc_request(req, res, "/in_peers", fail_message.c_str()))
{
return true;
}
}
else
{
if (!m_rpc_server->on_in_peers(req, res) || res.status != CORE_RPC_STATUS_OK)
{
tools::fail_msg_writer() << make_error(fail_message, res.status);
return true;
}
}
std::cout << "Max number of in peers set to " << limit << std::endl;
return true;
}
bool t_rpc_command_executor::start_save_graph()
{
cryptonote::COMMAND_RPC_START_SAVE_GRAPH::request req;

2
src/daemon/rpc_command_executor.h
View File

@ -123,6 +123,8 @@ public:
bool out_peers(uint64_t limit);
bool in_peers(uint64_t limit);
bool start_save_graph();
bool stop_save_graph();

1
src/p2p/net_node.cpp
View File

@ -55,6 +55,7 @@ namespace nodetool
const command_line::arg_descriptor<bool> arg_no_igd = {"no-igd", "Disable UPnP port mapping"};
const command_line::arg_descriptor<int64_t> arg_out_peers = {"out-peers", "set max number of out peers", -1};
const command_line::arg_descriptor<int64_t> arg_in_peers = {"in-peers", "set max number of in peers", -1};
const command_line::arg_descriptor<int> arg_tos_flag = {"tos-flag", "set TOS flag", -1};
const command_line::arg_descriptor<int64_t> arg_limit_rate_up = {"limit-rate-up", "set limit-rate-up [kB/s]", -1};

8
src/p2p/net_node.h
View File

@ -81,6 +81,7 @@ namespace nodetool
node_server(t_payload_net_handler& payload_handler)
:m_payload_handler(payload_handler),
m_current_number_of_out_peers(0),
m_current_number_of_in_peers(0),
m_allow_local_ip(false),
m_hide_my_port(false),
m_no_igd(false),
@ -117,8 +118,10 @@ namespace nodetool
bool log_connections();
virtual uint64_t get_connections_count();
size_t get_outgoing_connections_count();
size_t get_incoming_connections_count();
peerlist_manager& get_peerlist_manager(){return m_peerlist;}
void delete_connections(size_t count);
void delete_out_connections(size_t count);
void delete_in_connections(size_t count);
virtual bool block_host(const epee::net_utils::network_address &adress, time_t seconds = P2P_IP_BLOCKTIME);
virtual bool unblock_host(const epee::net_utils::network_address &address);
virtual std::map<std::string, time_t> get_blocked_hosts() { CRITICAL_REGION_LOCAL(m_blocked_hosts_lock); return m_blocked_hosts; }
@ -230,6 +233,7 @@ namespace nodetool
bool parse_peers_and_add_to_container(const boost::program_options::variables_map& vm, const command_line::arg_descriptor<std::vector<std::string> > & arg, Container& container);
bool set_max_out_peers(const boost::program_options::variables_map& vm, int64_t max);
bool set_max_in_peers(const boost::program_options::variables_map& vm, int64_t max);
bool set_tos_flag(const boost::program_options::variables_map& vm, int limit);
bool set_rate_up_limit(const boost::program_options::variables_map& vm, int64_t limit);
@ -271,6 +275,7 @@ namespace nodetool
public:
config m_config; // TODO was private, add getters?
std::atomic<unsigned int> m_current_number_of_out_peers;
std::atomic<unsigned int> m_current_number_of_in_peers;
void set_save_graph(bool save_graph)
{
@ -345,6 +350,7 @@ namespace nodetool
extern const command_line::arg_descriptor<bool> arg_no_igd;
extern const command_line::arg_descriptor<bool> arg_offline;
extern const command_line::arg_descriptor<int64_t> arg_out_peers;
extern const command_line::arg_descriptor<int64_t> arg_in_peers;
extern const command_line::arg_descriptor<int> arg_tos_flag;
extern const command_line::arg_descriptor<int64_t> arg_limit_rate_up;

79
src/p2p/net_node.inl
View File

@ -85,6 +85,7 @@ namespace nodetool
command_line::add_arg(desc, arg_p2p_hide_my_port);
command_line::add_arg(desc, arg_no_igd);
command_line::add_arg(desc, arg_out_peers);
command_line::add_arg(desc, arg_in_peers);
command_line::add_arg(desc, arg_tos_flag);
command_line::add_arg(desc, arg_limit_rate_up);
command_line::add_arg(desc, arg_limit_rate_down);
@ -315,6 +316,9 @@ namespace nodetool
if ( !set_max_out_peers(vm, command_line::get_arg(vm, arg_out_peers) ) )
return false;
if ( !set_max_in_peers(vm, command_line::get_arg(vm, arg_in_peers) ) )
return false;
if ( !set_tos_flag(vm, command_line::get_arg(vm, arg_tos_flag) ) )
return false;
@ -565,14 +569,23 @@ namespace nodetool
while (!is_closing && !m_net_server.is_stop_signal_sent())
{ // main loop of thread
//number_of_peers = m_net_server.get_config_object().get_connections_count();
unsigned int number_of_peers = 0;
unsigned int number_of_in_peers = 0;
unsigned int number_of_out_peers = 0;
m_net_server.get_config_object().foreach_connection([&](const p2p_connection_context& cntxt)
{
if (!cntxt.m_is_income) ++number_of_peers;
if (cntxt.m_is_income)
{
++number_of_in_peers;
}
else
{
++number_of_out_peers;
}
return true;
}); // lambda
m_current_number_of_out_peers = number_of_peers;
m_current_number_of_in_peers = number_of_in_peers;
m_current_number_of_out_peers = number_of_out_peers;
boost::this_thread::sleep_for(boost::chrono::seconds(1));
} // main loop of thread
@ -871,11 +884,11 @@ namespace nodetool
template<class t_payload_net_handler>
bool node_server<t_payload_net_handler>::try_to_connect_and_handshake_with_new_peer(const epee::net_utils::network_address& na, bool just_take_peerlist, uint64_t last_seen_stamp, PeerType peer_type, uint64_t first_seen_stamp)
{
if (m_current_number_of_out_peers == m_config.m_net_config.connections_count) // out peers limit
if (m_current_number_of_out_peers == m_config.m_net_config.max_out_connection_count) // out peers limit
{
return false;
}
else if (m_current_number_of_out_peers > m_config.m_net_config.connections_count)
else if (m_current_number_of_out_peers > m_config.m_net_config.max_out_connection_count)
{
m_net_server.get_config_object().del_out_connections(1);
m_current_number_of_out_peers --; // atomic variable, update time = 1s
@ -1164,10 +1177,10 @@ namespace nodetool
if (!connect_to_peerlist(m_priority_peers)) return false;
size_t expected_white_connections = (m_config.m_net_config.connections_count*P2P_DEFAULT_WHITELIST_CONNECTIONS_PERCENT)/100;
size_t expected_white_connections = (m_config.m_net_config.max_out_connection_count*P2P_DEFAULT_WHITELIST_CONNECTIONS_PERCENT)/100;
size_t conn_count = get_outgoing_connections_count();
if(conn_count < m_config.m_net_config.connections_count)
if(conn_count < m_config.m_net_config.max_out_connection_count)
{
if(conn_count < expected_white_connections)
{
@ -1178,20 +1191,20 @@ namespace nodetool
if(!make_expected_connections_count(white, expected_white_connections))
return false;
//then do grey list
if(!make_expected_connections_count(gray, m_config.m_net_config.connections_count))
if(!make_expected_connections_count(gray, m_config.m_net_config.max_out_connection_count))
return false;
}else
{
//start from grey list
if(!make_expected_connections_count(gray, m_config.m_net_config.connections_count))
if(!make_expected_connections_count(gray, m_config.m_net_config.max_out_connection_count))
return false;
//and then do white list
if(!make_expected_connections_count(white, m_config.m_net_config.connections_count))
if(!make_expected_connections_count(white, m_config.m_net_config.max_out_connection_count))
return false;
}
}
if (start_conn_count == get_outgoing_connections_count() && start_conn_count < m_config.m_net_config.connections_count)
if (start_conn_count == get_outgoing_connections_count() && start_conn_count < m_config.m_net_config.max_out_connection_count)
{
MINFO("Failed to connect to any, trying seeds");
if (!connect_to_seed())
@ -1253,6 +1266,20 @@ namespace nodetool
}
//-----------------------------------------------------------------------------------
template<class t_payload_net_handler>
size_t node_server<t_payload_net_handler>::get_incoming_connections_count()
{
size_t count = 0;
m_net_server.get_config_object().foreach_connection([&](const p2p_connection_context& cntxt)
{
if(cntxt.m_is_income)
++count;
return true;
});
return count;
}
//-----------------------------------------------------------------------------------
template<class t_payload_net_handler>
bool node_server<t_payload_net_handler>::idle_worker()
{
m_peer_handshake_idle_maker_interval.do_call(boost::bind(&node_server<t_payload_net_handler>::peer_sync_idle_maker, this));
@ -1618,6 +1645,13 @@ namespace nodetool
return 1;
}
if (m_current_number_of_in_peers >= m_config.m_net_config.max_in_connection_count) // in peers limit
{
LOG_WARNING_CC(context, "COMMAND_HANDSHAKE came, but already have max incoming connections, so dropping this one.");
drop_connection(context);
return 1;
}
if(!m_payload_handler.process_payload_sync_data(arg.payload_data, context, true))
{
LOG_WARNING_CC(context, "COMMAND_HANDSHAKE came, but process_payload_sync_data returned false, dropping connection.");
@ -1779,19 +1813,36 @@ namespace nodetool
bool node_server<t_payload_net_handler>::set_max_out_peers(const boost::program_options::variables_map& vm, int64_t max)
{
if(max == -1) {
m_config.m_net_config.connections_count = P2P_DEFAULT_CONNECTIONS_COUNT;
m_config.m_net_config.max_out_connection_count = P2P_DEFAULT_CONNECTIONS_COUNT;
return true;
}
m_config.m_net_config.connections_count = max;
m_config.m_net_config.max_out_connection_count = max;
return true;
}
template<class t_payload_net_handler>
void node_server<t_payload_net_handler>::delete_connections(size_t count)
bool node_server<t_payload_net_handler>::set_max_in_peers(const boost::program_options::variables_map& vm, int64_t max)
{
if(max == -1) {
m_config.m_net_config.max_in_connection_count = -1;
return true;
}
m_config.m_net_config.max_in_connection_count = max;
return true;
}
template<class t_payload_net_handler>
void node_server<t_payload_net_handler>::delete_out_connections(size_t count)
{
m_net_server.get_config_object().del_out_connections(count);
}
template<class t_payload_net_handler>
void node_server<t_payload_net_handler>::delete_in_connections(size_t count)
{
m_net_server.get_config_object().del_in_connections(count);
}
template<class t_payload_net_handler>
bool node_server<t_payload_net_handler>::set_tos_flag(const boost::program_options::variables_map& vm, int flag)
{

6
src/p2p/p2p_protocol_defs.h
View File

@ -131,13 +131,15 @@ namespace nodetool
struct network_config
{
BEGIN_KV_SERIALIZE_MAP()
KV_SERIALIZE(connections_count)
KV_SERIALIZE(max_out_connection_count)
KV_SERIALIZE(max_in_connection_count)
KV_SERIALIZE(handshake_interval)
KV_SERIALIZE(packet_max_size)
KV_SERIALIZE(config_id)
END_KV_SERIALIZE_MAP()
uint32_t connections_count;
uint32_t max_out_connection_count;
uint32_t max_in_connection_count;
uint32_t connection_timeout;
uint32_t ping_connection_timeout;
uint32_t handshake_interval;

16
src/rpc/core_rpc_server.cpp
View File

@ -1596,9 +1596,21 @@ namespace cryptonote
PERF_TIMER(on_out_peers);
size_t n_connections = m_p2p.get_outgoing_connections_count();
size_t n_delete = (n_connections > req.out_peers) ? n_connections - req.out_peers : 0;
m_p2p.m_config.m_net_config.connections_count = req.out_peers;
m_p2p.m_config.m_net_config.max_out_connection_count = req.out_peers;
if (n_delete)
m_p2p.delete_connections(n_delete);
m_p2p.delete_out_connections(n_delete);
res.status = CORE_RPC_STATUS_OK;
return true;
}
//------------------------------------------------------------------------------------------------------------------------------
bool core_rpc_server::on_in_peers(const COMMAND_RPC_IN_PEERS::request& req, COMMAND_RPC_IN_PEERS::response& res)
{
PERF_TIMER(on_in_peers);
size_t n_connections = m_p2p.get_incoming_connections_count();
size_t n_delete = (n_connections > req.in_peers) ? n_connections - req.in_peers : 0;
m_p2p.m_config.m_net_config.max_in_connection_count = req.in_peers;
if (n_delete)
m_p2p.delete_in_connections(n_delete);
res.status = CORE_RPC_STATUS_OK;
return true;
}

2
src/rpc/core_rpc_server.h
View File

@ -114,6 +114,7 @@ namespace cryptonote
MAP_URI_AUTO_JON2("/get_limit", on_get_limit, COMMAND_RPC_GET_LIMIT)
MAP_URI_AUTO_JON2_IF("/set_limit", on_set_limit, COMMAND_RPC_SET_LIMIT, !m_restricted)
MAP_URI_AUTO_JON2_IF("/out_peers", on_out_peers, COMMAND_RPC_OUT_PEERS, !m_restricted)
MAP_URI_AUTO_JON2_IF("/in_peers", on_in_peers, COMMAND_RPC_IN_PEERS, !m_restricted)
MAP_URI_AUTO_JON2_IF("/start_save_graph", on_start_save_graph, COMMAND_RPC_START_SAVE_GRAPH, !m_restricted)
MAP_URI_AUTO_JON2_IF("/stop_save_graph", on_stop_save_graph, COMMAND_RPC_STOP_SAVE_GRAPH, !m_restricted)
MAP_URI_AUTO_JON2("/get_outs", on_get_outs, COMMAND_RPC_GET_OUTPUTS)
@ -183,6 +184,7 @@ namespace cryptonote
bool on_get_limit(const COMMAND_RPC_GET_LIMIT::request& req, COMMAND_RPC_GET_LIMIT::response& res);
bool on_set_limit(const COMMAND_RPC_SET_LIMIT::request& req, COMMAND_RPC_SET_LIMIT::response& res);
bool on_out_peers(const COMMAND_RPC_OUT_PEERS::request& req, COMMAND_RPC_OUT_PEERS::response& res);
bool on_in_peers(const COMMAND_RPC_IN_PEERS::request& req, COMMAND_RPC_IN_PEERS::response& res);
bool on_start_save_graph(const COMMAND_RPC_START_SAVE_GRAPH::request& req, COMMAND_RPC_START_SAVE_GRAPH::response& res);
bool on_stop_save_graph(const COMMAND_RPC_STOP_SAVE_GRAPH::request& req, COMMAND_RPC_STOP_SAVE_GRAPH::response& res);
bool on_update(const COMMAND_RPC_UPDATE::request& req, COMMAND_RPC_UPDATE::response& res);

22
src/rpc/core_rpc_server_commands_defs.h
View File

@ -1678,7 +1678,27 @@ namespace cryptonote
struct response
{
std::string status;
std::string status;
BEGIN_KV_SERIALIZE_MAP()
KV_SERIALIZE(status)
END_KV_SERIALIZE_MAP()
};
};
struct COMMAND_RPC_IN_PEERS
{
struct request
{
uint64_t in_peers;
BEGIN_KV_SERIALIZE_MAP()
KV_SERIALIZE(in_peers)
END_KV_SERIALIZE_MAP()
};
struct response
{
std::string status;
BEGIN_KV_SERIALIZE_MAP()
KV_SERIALIZE(status)