add coroutine experiment

main.cpp

@@ -24,6 +24,7 @@
 #include <vector>
 #include <unordered_map>
 #include <unordered_set>
+#include <coroutine>
 
 #include "ping_thread.hpp"
 #include "registration_thread.hpp"
@@ -32,6 +33,61 @@
 
 using namespace std::chrono_literals;
 
+struct irc_promise;
+
+struct irc_coroutine : std::coroutine_handle<irc_promise> {
+    using promise_type = irc_promise;
+};
+
+struct irc_promise {
+    std::exception_ptr exception_;
+
+    irc_coroutine get_return_object() { return {irc_coroutine::from_promise(*this)}; }
+    std::suspend_never initial_suspend() noexcept { return {}; }
+    std::suspend_always final_suspend() noexcept { return {}; }
+    void return_void() {}
+    void unhandled_exception() {
+        exception_ = std::current_exception();
+    }
+};
+
+struct wait_command {
+    Connection& connection_;
+    IrcCommand want_cmd_;
+
+    const IrcMsg *result;
+    boost::signals2::connection ircmsg_connection_;
+    boost::signals2::connection disconnect_connection_;
+
+    wait_command(Connection& connection, IrcCommand want_cmd)
+        : connection_{connection}, want_cmd_{want_cmd} {}
+
+    bool await_ready() noexcept { return false; }
+    void await_suspend(std::coroutine_handle<irc_promise> handle) {
+        ircmsg_connection_ = connection_.sig_ircmsg.connect([this, handle](auto cmd, auto &msg) {
+            if (cmd == want_cmd_) {
+                ircmsg_connection_.disconnect();
+                disconnect_connection_.disconnect();
+                result = &msg;
+                handle.resume();
+            }
+        });
+        disconnect_connection_ = connection_.sig_disconnect.connect([this, handle]() {
+            ircmsg_connection_.disconnect();
+            disconnect_connection_.disconnect();
+            handle.destroy(); // XXX
+        });
+    }
+    const IrcMsg &await_resume() { return *result; }
+};
+
+irc_coroutine example(Connection& connection) {
+        auto & msg1 = co_await wait_command {connection, IrcCommand::RPL_WELCOME};
+        std::cout << "WELCOME " << msg1.args[0] << "\n";
+        auto & msg5 = co_await wait_command {connection, IrcCommand::RPL_ISUPPORT};
+        std::cout << "ISUPPORT " << msg5.args[0] << "\n";
+}
+
 auto start(boost::asio::io_context & io, Settings const& settings) -> void
 {
     auto const connection = std::make_shared<Connection>(io);
@@ -41,14 +97,7 @@ auto start(boost::asio::io_context & io, Settings const& settings) -> void
     SelfThread::start(*connection);
     auto const snote_thread = SnoteThread::start(*connection);
 
-/*
-    WatchdogThread::start(*connection);
-    IrcParseThread::start(*connection);
-    CommandThread::start(*connection);
-    auto const priv_thread = PrivThread::start(*connection, "privs.toml");
-    echo_thread(*connection, priv_thread);
-
-*/
+    /*
     snote_thread->sig_snote.connect([](auto tag, auto &match) {
         std::cout << "SNOTE " << static_cast<int>(tag) << std::endl;
         for (auto c : match.get_results())
@@ -56,6 +105,8 @@ auto start(boost::asio::io_context & io, Settings const& settings) -> void
             std::cout << "    " << std::string_view{c.first, c.second} << std::endl;
         }
     });
+    */
+    auto logic = example(*connection);
 
     boost::asio::co_spawn(
         io,