Add the Vst3Bridge boilerplate

src/common/communication/vst3.h

@@ -0,0 +1,65 @@
+// yabridge: a Wine VST bridge
+// Copyright (C) 2020  Robbert van der Helm
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#pragma once
+
+#include <atomic>
+
+#include "common.h"
+
+/**
+ * Manages all the sockets used for communicating between the plugin and the
+ * Wine host when hosting a VST3 plugin.
+ *
+ * On the plugin side this class should be initialized with `listen` set to
+ * `true` before launching the Wine VST host. This will start listening on the
+ * sockets, and the call to `connect()` will then accept any incoming
+ * connections.
+ *
+ * @tparam Thread The thread implementation to use. On the Linux side this
+ *   should be `std::jthread` and on the Wine side this should be `Win32Thread`.
+ */
+template <typename Thread>
+class Vst3Sockets : public Sockets {
+   public:
+    /**
+     * Sets up the sockets using the specified base directory. The sockets won't
+     * be active until `connect()` gets called.
+     *
+     * @param io_context The IO context the sockets should be bound to. Relevant
+     *   when doing asynchronous operations.
+     * @param endpoint_base_dir The base directory that will be used for the
+     *   Unix domain sockets.
+     * @param listen If `true`, start listening on the sockets. Incoming
+     *   connections will be accepted when `connect()` gets called. This should
+     *   be set to `true` on the plugin side, and `false` on the Wine host side.
+     *
+     * @see Vst3Sockets::connect
+     */
+    Vst3Sockets(boost::asio::io_context& io_context,
+                const boost::filesystem::path& endpoint_base_dir,
+                bool listen)
+        : Sockets(endpoint_base_dir) {}
+
+    ~Vst3Sockets() { close(); }
+
+    void connect() override {}
+
+    void close() override {
+        // Manually close all sockets so we break out of any blocking operations
+        // that may still be active
+    }
+};