Added test for websocket leak (#225)

* Added test for websocket leak

* Fixed test

test/CMakeLists.txt

@@ -42,6 +42,7 @@ set (SOURCES
 
   IXSocketTest.cpp
   IXSocketConnectTest.cpp
+  IXWebSocketLeakTest.cpp
   IXWebSocketServerTest.cpp
   IXWebSocketTestConnectionDisconnection.cpp
   IXUrlParserTest.cpp

test/IXWebSocketLeakTest.cpp

@@ -0,0 +1,176 @@
+#include "IXTest.h"
+
+#include "catch.hpp"
+#include <memory>
+#include <sstream>
+
+#include <ixwebsocket/IXWebSocket.h>
+#include <ixwebsocket/IXWebSocketServer.h>
+
+using namespace ix;
+
+namespace
+{
+    class WebSocketClient
+    {
+    public:
+        WebSocketClient(int port);
+        void start();
+        void stop();
+        bool isReady() const;
+        bool hasConnectionError() const;
+
+    private:
+        ix::WebSocket _webSocket;
+        int _port;
+        std::atomic<bool> _connectionError;
+    };
+
+    WebSocketClient::WebSocketClient(int port)
+        : _port(port)
+        , _connectionError(false)
+    {
+    }
+
+    bool WebSocketClient::hasConnectionError() const
+    {
+        return _connectionError;
+    }
+
+    bool WebSocketClient::isReady() const
+    {
+        return _webSocket.getReadyState() == ix::ReadyState::Open;
+    }
+
+    void WebSocketClient::stop()
+    {
+        _webSocket.stop();
+    }
+
+    void WebSocketClient::start()
+    {
+        std::string url;
+        {
+            std::stringstream ss;
+            ss << "ws://localhost:" << _port << "/";
+
+            url = ss.str();
+        }
+
+        _webSocket.setUrl(url);
+        _webSocket.disableAutomaticReconnection();
+
+        std::stringstream ss;
+        log(std::string("Connecting to url: ") + url);
+
+        _webSocket.setOnMessageCallback([this](const ix::WebSocketMessagePtr& msg)
+        {
+            std::stringstream ss;
+            if (msg->type == ix::WebSocketMessageType::Open)
+            {
+                log("client connected");
+            }
+            else if (msg->type == ix::WebSocketMessageType::Close)
+            {
+                log("client disconnected");
+            }
+            else if (msg->type == ix::WebSocketMessageType::Error)
+            {
+                _connectionError = true;
+                log("error");
+            }
+            else if (msg->type == ix::WebSocketMessageType::Pong)
+            {
+                log("pong");
+            }
+            else if (msg->type == ix::WebSocketMessageType::Ping)
+            {
+                log("ping");
+            }
+            else if (msg->type == ix::WebSocketMessageType::Message)
+            {
+                log("message");
+            }
+            else
+            {
+                log("invalid type");
+            }
+        });
+
+        _webSocket.start();
+    }
+} // namespace
+
+TEST_CASE("Websocket leak test")
+{
+    SECTION("Websocket destructor is called when closing the connection.")
+    {
+        // stores the server websocket in order to check the use_count
+        std::shared_ptr<WebSocket> webSocketPtr;
+
+        {
+            int port = getFreePort();
+            WebSocketServer server(port);
+
+            server.setOnConnectionCallback([&webSocketPtr](std::shared_ptr<ix::WebSocket> webSocket,
+                                                           std::shared_ptr<ConnectionState> connectionState,
+                                                           std::unique_ptr<ConnectionInfo> connectionInfo)
+           {
+                // original ptr in WebSocketServer::handleConnection and the callback argument
+                REQUIRE(webSocket.use_count() == 2);
+                webSocket->setOnMessageCallback([&webSocketPtr, webSocket, connectionState](const ix::WebSocketMessagePtr& msg)
+                {
+                    if (msg->type == ix::WebSocketMessageType::Open)
+                    {
+                        log(std::string("New connection id: ") + connectionState->getId());
+                        // original ptr in WebSocketServer::handleConnection, captured ptr of this callback, and ptr in WebSocketServer::_clients
+                        REQUIRE(webSocket.use_count() == 3);
+                        webSocketPtr = std::shared_ptr<WebSocket>(webSocket);
+                        REQUIRE(webSocket.use_count() == 4);
+                    }
+                    else if (msg->type == ix::WebSocketMessageType::Close)
+                    {
+                        log(std::string("Client closed connection id: ") + connectionState->getId());
+                    }
+                    else
+                    {
+                        log(std::string(msg->str));
+                    }
+                });
+                // original ptr in WebSocketServer::handleConnection, argument of this callback, and captured ptr in websocket callback
+                REQUIRE(webSocket.use_count() == 3);
+            });
+
+            server.listen();
+            server.start();
+
+            WebSocketClient webSocketClient(port);
+            webSocketClient.start();
+
+            while (true)
+            {
+                REQUIRE(!webSocketClient.hasConnectionError());
+                if (webSocketClient.isReady()) break;
+                ix::msleep(10);
+            }
+
+            REQUIRE(server.getClients().size() == 1);
+            // same value as in Open-handler above
+            REQUIRE(webSocketPtr.use_count() == 4);
+
+            ix::msleep(500);
+            webSocketClient.stop();
+            ix::msleep(500);
+            REQUIRE(server.getClients().size() == 0);
+
+            // websocket should only be referenced by webSocketPtr but is still used by the websocket callback
+            REQUIRE(webSocketPtr.use_count() == 1);
+            webSocketPtr->setOnMessageCallback(nullptr);
+            // websocket should only be referenced by webSocketPtr
+            REQUIRE(webSocketPtr.use_count() == 1);
+            server.stop();
+        }
+        // websocket should only be referenced by webSocketPtr
+        REQUIRE(webSocketPtr.use_count() == 1);
+    }
+}