samples/websocket_service/main.cpp

#include <userver/utest/using_namespace_userver.hpp>

#include <userver/components/minimal_server_component_list.hpp>
#include <userver/server/websocket/websocket_handler.hpp>
#include <userver/utils/daemon_run.hpp>
 
namespace samples::websocket {
 
class WebsocketsHandler final : public server::websocket::WebsocketHandlerBase {
public:
    // `kName` is used as the component name in static config
    static constexpr std::string_view kName = "websocket-handler";
 
    // Component is valid after construction and is able to accept requests
    using WebsocketHandlerBase::WebsocketHandlerBase;
 
    void Handle(server::websocket::WebSocketConnection& chat, server::request::RequestContext&) const override {
        server::websocket::Message message;
        while (!engine::current_task::ShouldCancel()) {
            chat.Recv(message);  // throws on closed/dropped connection
            if (message.close_status) {
                break;  // explicit close if any
            }
            chat.Send(std::move(message));  // throws on closed/dropped connection
        }
        if (message.close_status) {
            chat.Close(*message.close_status);
        }
    }
};
 
}  // namespace samples::websocket

int main(int argc, char* argv[]) {
    const auto
        component_list = components::MinimalServerComponentList().Append<samples::websocket::WebsocketsHandler>();
    return utils::DaemonMain(argc, argv, component_list);
}