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CrealityPrint: add ws_send_and_read() helper

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Add a reusable websocket helper that sends a JSON command and loops
reads until finding a response containing the expected key. This
handles the printer's unsolicited status messages that arrive on
connect before the actual response. Returns empty string on timeout
instead of throwing.

Signed-off-by: Igor Mammedov <niallain@gmail.com>
This commit is contained in:
Igor Mammedov
2026-04-21 21:49:49 +02:00
parent 8e1ef9bc5f
commit c746c48649
1 changed files with 21 additions and 0 deletions
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21
src/slic3r/Utils/CrealityPrint.cpp
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@@ -222,6 +222,27 @@ static void ws_connect(net::io_context& ioc, websocket::stream<beast::tcp_stream
setsockopt(beast::get_lowest_layer(ws).socket().native_handle(),
SOL_SOCKET, SO_RCVTIMEO, reinterpret_cast<const char*>(&recv_timeout), sizeof(recv_timeout));
}
static std::string ws_send_and_read(websocket::stream<beast::tcp_stream>& ws, const json& cmd, const std::string& expected_key, int max_reads = 20)
{
ws.write(net::buffer(to_string(cmd)));
for (int i = 0; i < max_reads; i++) {
beast::flat_buffer buf;
beast::error_code ec;
ws.read(buf, ec);
if (ec == net::error::would_block)
break;
if (ec)
throw beast::system_error{ec};
std::string msg = beast::buffers_to_string(buf.data());
if (msg.find(expected_key) != std::string::npos)
return msg;
}
BOOST_LOG_TRIVIAL(warning) << "CrealityPrint: No '" << expected_key << "' response after " << max_reads << " messages";
return {};
}
void CrealityPrint::query_model() const
{
if (!m_model.empty())