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// Copyright (c) 2016-2020, The Monero Project
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "zmq_server.h"
#include <chrono>
#include <cstdint>
#include <system_error>
#include "byte_slice.h"
namespace cryptonote
{
namespace
{
constexpr const int num_zmq_threads = 1;
constexpr const std::int64_t max_message_size = 10 * 1024 * 1024; // 10 MiB
constexpr const std::chrono::seconds linger_timeout{2}; // wait period for pending out messages
}
namespace rpc
{
ZmqServer::ZmqServer(RpcHandler& h) :
handler(h),
context(zmq_init(num_zmq_threads))
{
if (!context)
MONERO_ZMQ_THROW("Unable to create ZMQ context");
}
ZmqServer::~ZmqServer()
{
}
void ZmqServer::serve()
{
try
{
// socket must close before `zmq_term` will exit.
const net::zmq::socket socket = std::move(rep_socket);
if (!socket)
{
MERROR("ZMQ RPC server reply socket is null");
return;
}
while (1)
{
const std::string message = MONERO_UNWRAP(net::zmq::receive(socket.get()));
MDEBUG("Received RPC request: \"" << message << "\"");
epee::byte_slice response = handler.handle(message);
const boost::string_ref response_view{reinterpret_cast<const char*>(response.data()), response.size()};
MDEBUG("Sending RPC reply: \"" << response_view << "\"");
MONERO_UNWRAP(net::zmq::send(std::move(response), socket.get()));
}
}
catch (const std::system_error& e)
{
if (e.code() != net::zmq::make_error_code(ETERM))
MERROR("ZMQ RPC Server Error: " << e.what());
}
catch (const std::exception& e)
{
MERROR("ZMQ RPC Server Error: " << e.what());
}
catch (...)
{
MERROR("Unknown error in ZMQ RPC server");
}
}
bool ZmqServer::addIPCSocket(const boost::string_ref address, const boost::string_ref port)
{
MERROR("ZmqServer::addIPCSocket not yet implemented!");
return false;
}
bool ZmqServer::addTCPSocket(boost::string_ref address, boost::string_ref port)
{
if (!context)
{
MERROR("ZMQ RPC Server already shutdown");
return false;
}
rep_socket.reset(zmq_socket(context.get(), ZMQ_REP));
if (!rep_socket)
{
MONERO_LOG_ZMQ_ERROR("ZMQ RPC Server socket create failed");
return false;
}
if (zmq_setsockopt(rep_socket.get(), ZMQ_MAXMSGSIZE, std::addressof(max_message_size), sizeof(max_message_size)) != 0)
{
MONERO_LOG_ZMQ_ERROR("Failed to set maximum incoming message size");
return false;
}
static constexpr const int linger_value = std::chrono::milliseconds{linger_timeout}.count();
if (zmq_setsockopt(rep_socket.get(), ZMQ_LINGER, std::addressof(linger_value), sizeof(linger_value)) != 0)
{
MONERO_LOG_ZMQ_ERROR("Failed to set linger timeout");
return false;
}
if (address.empty())
address = "*";
if (port.empty())
port = "*";
std::string bind_address = "tcp://";
bind_address.append(address.data(), address.size());
bind_address += ":";
bind_address.append(port.data(), port.size());
if (zmq_bind(rep_socket.get(), bind_address.c_str()) < 0)
{
MONERO_LOG_ZMQ_ERROR("ZMQ RPC Server bind failed");
return false;
}
return true;
}
void ZmqServer::run()
{
run_thread = boost::thread(boost::bind(&ZmqServer::serve, this));
}
void ZmqServer::stop()
{
if (!run_thread.joinable())
return;
context.reset(); // destroying context terminates all calls
run_thread.join();
}
} // namespace cryptonote
} // namespace rpc
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