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Fix EAGAIN bug in ZMQ-RPC/ZMQ-PUB [0.18] #9053

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merged 1 commit into from
Jan 18, 2024
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Fix EAGAIN bug in ZMQ-RPC/ZMQ-PUB [0.18] #9053

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23 changes: 16 additions & 7 deletions src/rpc/zmq_server.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -158,13 +158,22 @@ void ZmqServer::serve()

if (!pub || sockets[2].revents)
{
std::string message = MONERO_UNWRAP(net::zmq::receive(rep.get(), read_flags));
MDEBUG("Received RPC request: \"" << message << "\"");
epee::byte_slice response = handler.handle(std::move(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), rep.get()));
expect<std::string> message = net::zmq::receive(rep.get(), read_flags);
if (!message)
{
// EAGAIN can occur when using `zmq_poll`, which doesn't inspect for message validity
if (message != net::zmq::make_error_code(EAGAIN))
MONERO_THROW(message.error(), "Read failure on ZMQ-RPC");
}
else // no errors
{
MDEBUG("Received RPC request: \"" << *message << "\"");
epee::byte_slice response = handler.handle(std::move(*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), rep.get()));
}
}
}
}
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