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/*
Copyright (C) 2018-2019 SKALE Labs
This file is part of skale-consensus.
skale-consensus is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
skale-consensus is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with skale-consensus. If not, see <https://www.gnu.org/licenses/>.
@file ZMQClient.cpp
@author Stan Kladko
@date 2020
*/
#include "sys/random.h"
#include <sys/types.h>
#include <sys/syscall.h>
#include <fstream>
#include <streambuf>
#include "common.h"
#include "BLSSignReqMessage.h"
#include "BLSSignRspMessage.h"
#include "ECDSASignReqMessage.h"
#include "ECDSASignRspMessage.h"
#include "ZMQClient.h"
shared_ptr <ZMQMessage> ZMQClient::doRequestReply(Json::Value &_req) {
Json::FastWriter fastWriter;
string reqStr = fastWriter.write(_req);
//if (sign) {
_req["cert"] = certificate;
//}
reqStr = reqStr.substr(0, reqStr.size() - 1);
CHECK_STATE(reqStr.front() == '{');
CHECK_STATE(reqStr.at(reqStr.size() - 1) == '}');
auto resultStr = doZmqRequestReply(reqStr);
try {
CHECK_STATE(resultStr.size() > 5)
CHECK_STATE(resultStr.front() == '{')
CHECK_STATE(resultStr.back() == '}')
return ZMQMessage::parse(resultStr.c_str(), resultStr.size(), false);
} catch (std::exception &e) {
spdlog::error(string("Error in doRequestReply:") + e.what());
throw;
} catch (...) {
spdlog::error("Error in doRequestReply");
throw;
}
}
string ZMQClient::doZmqRequestReply(string &_req) {
stringstream request;
shared_ptr <zmq::socket_t> clientSocket = nullptr;
{
lock_guard <recursive_mutex> m(mutex);
if (!clientSockets.count(getProcessID()))
reconnect();
clientSocket = clientSockets.at(getProcessID());
CHECK_STATE(clientSocket);
}
CHECK_STATE(clientSocket);
spdlog::debug("ZMQ client sending: \n {}", _req);
s_send(*clientSocket, _req);
while (true) {
// Poll socket for a reply, with timeout
zmq::pollitem_t items[] = {
{static_cast<void *>(*clientSocket), 0, ZMQ_POLLIN, 0}};
zmq::poll(&items[0], 1, REQUEST_TIMEOUT);
// If we got a reply, process it
if (items[0].revents & ZMQ_POLLIN) {
string reply = s_recv(*clientSocket);
CHECK_STATE(reply.size() > 5);
reply = reply.substr(0, reply.size() - 1);
spdlog::debug("ZMQ client received reply:{}", reply);
CHECK_STATE(reply.front() == '{');
CHECK_STATE(reply.back() == '}');
return reply;
} else {
spdlog::error("W: no response from server, retrying...");
reconnect();
// Send request again, on new socket
s_send(*clientSocket, _req);
}
}
}
ZMQClient::ZMQClient(const string &ip, uint16_t port, bool _sign, const string &_certFileName,
const string &_certKeyName) : ctx(1) {
if (_sign) {
CHECK_STATE(!_certFileName.empty());
CHECK_STATE(!_certKeyName.empty());
ifstream t(_certFileName);
string str((istreambuf_iterator<char>(t)), istreambuf_iterator<char>());
certificate = str;
CHECK_STATE(!certificate.empty());
} else {
CHECK_STATE(_certFileName.empty());
CHECK_STATE(_certKeyName.empty());
}
certFileName = _certFileName;
certKeyName = _certKeyName;
url = "tcp://" + ip + ":" + to_string(port);
}
void ZMQClient::reconnect() {
lock_guard <recursive_mutex> lock(mutex);
auto pid = getProcessID();
if (clientSockets.count(pid) > 0) {
clientSockets.erase(pid);
}
char identity[10];
getrandom(identity, 10, 0);
auto clientSocket = make_shared<zmq::socket_t>(ctx, ZMQ_DEALER);
clientSocket->setsockopt(ZMQ_IDENTITY, identity, 10);
// Configure socket to not wait at close time
int linger = 0;
clientSocket->setsockopt(ZMQ_LINGER, &linger, sizeof(linger));
clientSocket->connect(url);
clientSockets.insert({pid, clientSocket});
}
string ZMQClient::blsSignMessageHash(const std::string &keyShareName, const std::string &messageHash, int t, int n) {
Json::Value p;
p["type"] = ZMQMessage::BLS_SIGN_REQ;
p["keyShareName"] = keyShareName;
p["messageHash"] = messageHash;
p["n"] = n;
p["t"] = t;
auto result = dynamic_pointer_cast<BLSSignRspMessage>(doRequestReply(p));
CHECK_STATE(result);
CHECK_STATE(result->getStatus() == 0);
return result->getSigShare();
}
string ZMQClient::ecdsaSignMessageHash(int base, const std::string &keyName, const std::string &messageHash) {
Json::Value p;
p["type"] = ZMQMessage::ECDSA_SIGN_REQ;
p["base"] = base;
p["keyName"] = keyName;
p["messageHash"] = messageHash;
auto result = dynamic_pointer_cast<ECDSASignRspMessage>(doRequestReply(p));
CHECK_STATE(result);
CHECK_STATE(result->getStatus() == 0);
return result->getSignature();
}
uint64_t ZMQClient::getProcessID() {
return syscall(__NR_gettid);
}