Refactor http server

include/httpserver.hpp

@@ -3,34 +3,75 @@
 
 #include <array>
 #include <atomic>
+#include <condition_variable>
 #include <map>
+#include <memory>
 #include <mutex>
+#include <queue>
+#include <thread>
 
 #include "helpers.hpp"
 
-enum class HttpAction { None, Screenshot, PressKey, ReleaseKey };
+enum class HttpActionType { None, Screenshot, Key };
+
+class Emulator;
+namespace httplib {
+	class Server;
+	class Response;
+}  // namespace httplib
+
+// Wrapper for httplib::Response that allows the HTTP server to wait for the response to be ready
+struct DeferredResponseWrapper {
+	DeferredResponseWrapper(httplib::Response& response) : inner_response(response) {}
+
+	httplib::Response& inner_response;
+	std::mutex mutex;
+	std::condition_variable cv;
+	bool ready = false;
+};
+
+// Actions derive from this class and are used to communicate with the HTTP server
+class HttpAction {
+  public:
+	HttpAction(HttpActionType type) : type(type) {}
+	virtual ~HttpAction() = default;
+
+	HttpActionType getType() const { return type; }
+
+	static std::unique_ptr<HttpAction> createScreenshotAction(DeferredResponseWrapper& response);
+	static std::unique_ptr<HttpAction> createKeyAction(uint32_t key, bool state);
+
+  private:
+	HttpActionType type;
+};
 
 struct HttpServer {
+	HttpServer(Emulator* emulator);
+	~HttpServer();
+
+	void processActions();
+
+  private:
 	static constexpr const char* httpServerScreenshotPath = "screenshot.png";
 
-	std::atomic_bool pendingAction = false;
-	HttpAction action = HttpAction::None;
-	std::mutex actionMutex = {};
-	u32 pendingKey = 0;
+	Emulator* emulator;
 
-	HttpServer();
+	std::unique_ptr<httplib::Server> server;
 
-	void startHttpServer();
-	std::string status();
+	std::thread httpServerThread;
+	std::queue<std::unique_ptr<HttpAction>> actionQueue;
+	std::mutex actionQueueMutex;
 
-private:
-	std::map<std::string, std::pair<u32, bool>> keyMap;
-	std::array<bool, 12> pressedKeys = {};
+	std::map<std::string, u32> keyMap;
 	bool paused = false;
 
+	void startHttpServer();
+	void pushAction(std::unique_ptr<HttpAction> action);
+	std::string status();
 	u32 stringToKey(const std::string& key_name);
-	bool getKeyState(const std::string& key_name);
-	void setKeyState(const std::string& key_name, bool state);
+
+	HttpServer(const HttpServer&) = delete;
+	HttpServer& operator=(const HttpServer&) = delete;
 };
 
 #endif  // PANDA3DS_ENABLE_HTTP_SERVER